diff options
Diffstat (limited to 'dom/base/nsContentUtils.cpp')
| -rw-r--r-- | dom/base/nsContentUtils.cpp | 11190 |
1 files changed, 11190 insertions, 0 deletions
diff --git a/dom/base/nsContentUtils.cpp b/dom/base/nsContentUtils.cpp new file mode 100644 index 0000000000..fd1dc60463 --- /dev/null +++ b/dom/base/nsContentUtils.cpp @@ -0,0 +1,11190 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* A namespace class for static layout utilities. */ + +#include "nsContentUtils.h" + +#include <algorithm> +#include <cstddef> +#include <cstdint> +#include <cstdlib> +#include <cstring> +#include <functional> +#include <new> +#include <utility> +#include "BrowserChild.h" +#include "DecoderTraits.h" +#include "ErrorList.h" +#include "HTMLSplitOnSpacesTokenizer.h" +#include "ImageOps.h" +#include "InProcessBrowserChildMessageManager.h" +#include "MainThreadUtils.h" +#include "PLDHashTable.h" +#include "ReferrerInfo.h" +#include "ScopedNSSTypes.h" +#include "ThirdPartyUtil.h" +#include "Units.h" +#include "chrome/common/ipc_message.h" +#include "gfxDrawable.h" +#include "harfbuzz/hb.h" +#include "imgICache.h" +#include "imgIContainer.h" +#include "imgILoader.h" +#include "imgIRequest.h" +#include "imgLoader.h" +#include "js/Array.h" +#include "js/ArrayBuffer.h" +#include "js/BuildId.h" +#include "js/GCAPI.h" +#include "js/Id.h" +#include "js/JSON.h" +#include "js/PropertyAndElement.h" // JS_DefineElement, JS_GetProperty +#include "js/PropertyDescriptor.h" +#include "js/Realm.h" +#include "js/RegExp.h" +#include "js/RegExpFlags.h" +#include "js/RootingAPI.h" +#include "js/TypeDecls.h" +#include "js/Value.h" +#include "js/Wrapper.h" +#include "jsapi.h" +#include "jsfriendapi.h" +#include "mozAutoDocUpdate.h" +#include "mozIDOMWindow.h" +#include "nsIOService.h" +#include "mozilla/AlreadyAddRefed.h" +#include "mozilla/ArrayIterator.h" +#include "mozilla/ArrayUtils.h" +#include "mozilla/AsyncEventDispatcher.h" +#include "mozilla/AtomArray.h" +#include "mozilla/Atomics.h" +#include "mozilla/Attributes.h" +#include "mozilla/AutoRestore.h" +#include "mozilla/AutoTimelineMarker.h" +#include "mozilla/BackgroundHangMonitor.h" +#include "mozilla/Base64.h" +#include "mozilla/BasePrincipal.h" +#include "mozilla/BasicEvents.h" +#include "mozilla/BloomFilter.h" +#include "mozilla/CORSMode.h" +#include "mozilla/CallState.h" +#include "mozilla/CheckedInt.h" +#include "mozilla/Components.h" +#include "mozilla/ContentBlockingAllowList.h" +#include "mozilla/CycleCollectedJSContext.h" +#include "mozilla/DOMEventTargetHelper.h" +#include "mozilla/DebugOnly.h" +#include "mozilla/ErrorResult.h" +#include "mozilla/EventDispatcher.h" +#include "mozilla/EventListenerManager.h" +#include "mozilla/EventQueue.h" +#include "mozilla/EventStateManager.h" +#include "mozilla/FlushType.h" +#include "mozilla/FOGIPC.h" +#include "mozilla/HTMLEditor.h" +#include "mozilla/HangAnnotations.h" +#include "mozilla/IMEStateManager.h" +#include "mozilla/InputEventOptions.h" +#include "mozilla/InternalMutationEvent.h" +#include "mozilla/Latin1.h" +#include "mozilla/Likely.h" +#include "mozilla/LoadInfo.h" +#include "mozilla/Logging.h" +#include "mozilla/MacroForEach.h" +#include "mozilla/ManualNAC.h" +#include "mozilla/Maybe.h" +#include "mozilla/MediaFeatureChange.h" +#include "mozilla/MouseEvents.h" +#include "mozilla/NotNull.h" +#include "mozilla/NullPrincipal.h" +#include "mozilla/OriginAttributes.h" +#include "mozilla/Preferences.h" +#include "mozilla/PresShell.h" +#include "mozilla/ProfilerRunnable.h" +#include "mozilla/RangeBoundary.h" +#include "mozilla/RefPtr.h" +#include "mozilla/Result.h" +#include "mozilla/ResultExtensions.h" +#include "mozilla/ScrollbarPreferences.h" +#include "mozilla/Span.h" +#include "mozilla/StaticAnalysisFunctions.h" +#include "mozilla/StaticPrefs_browser.h" +#include "mozilla/StaticPrefs_dom.h" +#ifdef FUZZING +# include "mozilla/StaticPrefs_fuzzing.h" +#endif +#include "mozilla/StaticPrefs_nglayout.h" +#include "mozilla/StaticPrefs_privacy.h" +#include "mozilla/StaticPrefs_test.h" +#include "mozilla/StaticPrefs_ui.h" +#include "mozilla/StaticPtr.h" +#include "mozilla/TaskCategory.h" +#include "mozilla/TextControlState.h" +#include "mozilla/TextEditor.h" +#include "mozilla/TextEvents.h" +#include "mozilla/UniquePtr.h" +#include "mozilla/Unused.h" +#include "mozilla/Variant.h" +#include "mozilla/ViewportUtils.h" +#include "mozilla/dom/AncestorIterator.h" +#include "mozilla/dom/AutoEntryScript.h" +#include "mozilla/dom/AutocompleteInfoBinding.h" +#include "mozilla/dom/AutoSuppressEventHandlingAndSuspend.h" +#include "mozilla/dom/BindingDeclarations.h" +#include "mozilla/dom/BindingUtils.h" +#include "mozilla/dom/BlobImpl.h" +#include "mozilla/dom/BlobURLProtocolHandler.h" +#include "mozilla/dom/BorrowedAttrInfo.h" +#include "mozilla/dom/BrowserBridgeParent.h" +#include "mozilla/dom/BrowserParent.h" +#include "mozilla/dom/BrowsingContext.h" +#include "mozilla/dom/BrowsingContextGroup.h" +#include "mozilla/dom/CallbackFunction.h" +#include "mozilla/dom/CallbackObject.h" +#include "mozilla/dom/ChromeMessageBroadcaster.h" +#include "mozilla/dom/ContentChild.h" +#include "mozilla/dom/ContentFrameMessageManager.h" +#include "mozilla/dom/ContentParent.h" +#include "mozilla/dom/CustomElementRegistry.h" +#include "mozilla/dom/CustomElementRegistryBinding.h" +#include "mozilla/dom/DOMArena.h" +#include "mozilla/dom/DOMException.h" +#include "mozilla/dom/DOMExceptionBinding.h" +#include "mozilla/dom/DOMSecurityMonitor.h" +#include "mozilla/dom/DOMTypes.h" +#include "mozilla/dom/DataTransfer.h" +#include "mozilla/dom/DocGroup.h" +#include "mozilla/dom/Document.h" +#include "mozilla/dom/DocumentFragment.h" +#include "mozilla/dom/DocumentInlines.h" +#include "mozilla/dom/Element.h" +#include "mozilla/dom/ElementBinding.h" +#include "mozilla/dom/ElementInlines.h" +#include "mozilla/dom/Event.h" +#include "mozilla/dom/EventTarget.h" +#include "mozilla/dom/FileBlobImpl.h" +#include "mozilla/dom/FileSystemSecurity.h" +#include "mozilla/dom/FilteredNodeIterator.h" +#include "mozilla/dom/FragmentOrElement.h" +#include "mozilla/dom/FromParser.h" +#include "mozilla/dom/HTMLFormElement.h" +#include "mozilla/dom/HTMLInputElement.h" +#include "mozilla/dom/HTMLTextAreaElement.h" +#include "mozilla/dom/IPCBlob.h" +#include "mozilla/dom/IPCBlobUtils.h" +#include "mozilla/dom/MessageBroadcaster.h" +#include "mozilla/dom/MessageListenerManager.h" +#include "mozilla/dom/MessagePort.h" +#include "mozilla/dom/MouseEventBinding.h" +#include "mozilla/dom/NameSpaceConstants.h" +#include "mozilla/dom/NodeBinding.h" +#include "mozilla/dom/NodeInfo.h" +#include "mozilla/dom/PBrowser.h" +#include "mozilla/dom/PContentChild.h" +#include "mozilla/dom/PrototypeList.h" +#include "mozilla/dom/ReferrerPolicyBinding.h" +#include "mozilla/dom/ScriptSettings.h" +#include "mozilla/dom/Selection.h" +#include "mozilla/dom/ShadowRoot.h" +#include "mozilla/dom/Text.h" +#include "mozilla/dom/UserActivation.h" +#include "mozilla/dom/WindowContext.h" +#include "mozilla/dom/WorkerCommon.h" +#include "mozilla/dom/WorkerPrivate.h" +#include "mozilla/dom/WorkerRunnable.h" +#include "mozilla/dom/XULCommandEvent.h" +#include "mozilla/fallible.h" +#include "mozilla/gfx/2D.h" +#include "mozilla/gfx/BaseMargin.h" +#include "mozilla/gfx/BasePoint.h" +#include "mozilla/gfx/BaseSize.h" +#include "mozilla/gfx/DataSurfaceHelpers.h" +#include "mozilla/gfx/Point.h" +#include "mozilla/gfx/Rect.h" +#include "mozilla/gfx/Types.h" +#include "mozilla/ipc/ProtocolUtils.h" +#include "mozilla/ipc/SharedMemory.h" +#include "mozilla/net/UrlClassifierCommon.h" +#include "mozilla/widget/IMEData.h" +#include "nsAboutProtocolUtils.h" +#include "nsAlgorithm.h" +#include "nsArrayUtils.h" +#include "nsAtom.h" +#include "nsAttrName.h" +#include "nsAttrValue.h" +#include "nsAttrValueInlines.h" +#include "nsBaseHashtable.h" +#include "nsCCUncollectableMarker.h" +#include "nsCOMPtr.h" +#include "nsCRT.h" +#include "nsCRTGlue.h" +#include "nsCanvasFrame.h" +#include "nsCaseTreatment.h" +#include "nsCharSeparatedTokenizer.h" +#include "nsCharTraits.h" +#include "nsCompatibility.h" +#include "nsComponentManagerUtils.h" +#include "nsContainerFrame.h" +#include "nsContentCreatorFunctions.h" +#include "nsContentDLF.h" +#include "nsContentList.h" +#include "nsContentListDeclarations.h" +#include "nsContentPolicyUtils.h" +#include "nsCoord.h" +#include "nsCycleCollectionNoteChild.h" +#include "nsDOMMutationObserver.h" +#include "nsDOMString.h" +#include "nsTHashMap.h" +#include "nsDebug.h" +#include "nsDocShell.h" +#include "nsDocShellCID.h" +#include "nsError.h" +#include "nsFocusManager.h" +#include "nsFrameList.h" +#include "nsFrameLoader.h" +#include "nsFrameLoaderOwner.h" +#include "nsGenericHTMLElement.h" +#include "nsGkAtoms.h" +#include "nsGlobalWindowInner.h" +#include "nsGlobalWindowOuter.h" +#include "nsHTMLDocument.h" +#include "nsHTMLTags.h" +#include "nsHashKeys.h" +#include "nsHtml5StringParser.h" +#include "nsIAboutModule.h" +#include "nsIAnonymousContentCreator.h" +#include "nsIAppShell.h" +#include "nsIArray.h" +#include "nsIAsyncVerifyRedirectCallback.h" +#include "nsIBidiKeyboard.h" +#include "nsIBrowser.h" +#include "nsICacheInfoChannel.h" +#include "nsICategoryManager.h" +#include "nsIChannel.h" +#include "nsIChannelEventSink.h" +#include "nsIClassifiedChannel.h" +#include "nsIConsoleService.h" +#include "nsIContent.h" +#include "nsIContentInlines.h" +#include "nsIContentPolicy.h" +#include "nsIContentSecurityPolicy.h" +#include "nsIContentSink.h" +#include "nsIContentViewer.h" +#include "nsIDOMWindowUtils.h" +#include "nsIDocShell.h" +#include "nsIDocShellTreeItem.h" +#include "nsIDocumentEncoder.h" +#include "nsIDocumentLoaderFactory.h" +#include "nsIDragService.h" +#include "nsIDragSession.h" +#include "nsIFile.h" +#include "nsIFocusManager.h" +#include "nsIFormControl.h" +#include "nsIFragmentContentSink.h" +#include "nsIFrame.h" +#include "nsIGlobalObject.h" +#include "nsIHttpChannel.h" +#include "nsIHttpChannelInternal.h" +#include "nsIIOService.h" +#include "nsIImageLoadingContent.h" +#include "nsIInputStream.h" +#include "nsIInterfaceRequestor.h" +#include "nsIInterfaceRequestorUtils.h" +#include "nsILoadContext.h" +#include "nsILoadGroup.h" +#include "nsILoadInfo.h" +#include "nsIMIMEService.h" +#include "nsIMemoryReporter.h" +#include "nsINetUtil.h" +#include "nsINode.h" +#include "nsIObjectLoadingContent.h" +#include "nsIObserver.h" +#include "nsIObserverService.h" +#include "nsIParserUtils.h" +#include "nsIPermissionManager.h" +#include "nsIPluginTag.h" +#include "nsIPrincipal.h" +#include "nsIProperties.h" +#include "nsIProtocolHandler.h" +#include "nsIRequest.h" +#include "nsIRunnable.h" +#include "nsIScreen.h" +#include "nsIScriptError.h" +#include "nsIScriptGlobalObject.h" +#include "nsIScriptObjectPrincipal.h" +#include "nsIScriptSecurityManager.h" +#include "nsISerialEventTarget.h" +#include "nsIStreamConverter.h" +#include "nsIStreamConverterService.h" +#include "nsIStringBundle.h" +#include "nsISupports.h" +#include "nsISupportsPrimitives.h" +#include "nsISupportsUtils.h" +#include "nsITransferable.h" +#include "nsIURI.h" +#include "nsIURIMutator.h" +#if defined(MOZ_THUNDERBIRD) || defined(MOZ_SUITE) +# include "nsIURIWithSpecialOrigin.h" +#endif +#include "nsIUserIdleServiceInternal.h" +#include "nsIWeakReferenceUtils.h" +#include "nsIWebNavigation.h" +#include "nsIWebNavigationInfo.h" +#include "nsIWidget.h" +#include "nsIWindowMediator.h" +#include "nsIXPConnect.h" +#include "nsJSPrincipals.h" +#include "nsJSUtils.h" +#include "nsLayoutUtils.h" +#include "nsLiteralString.h" +#include "nsMappedAttributes.h" +#include "nsMargin.h" +#include "nsMimeTypes.h" +#include "nsNameSpaceManager.h" +#include "nsNetCID.h" +#include "nsNetUtil.h" +#include "nsNodeInfoManager.h" +#include "nsPIDOMWindow.h" +#include "nsPIDOMWindowInlines.h" +#include "nsParser.h" +#include "nsParserConstants.h" +#include "nsPluginHost.h" +#include "nsPoint.h" +#include "nsPointerHashKeys.h" +#include "nsPresContext.h" +#include "nsQueryFrame.h" +#include "nsQueryObject.h" +#include "nsRange.h" +#include "nsRefPtrHashtable.h" +#include "nsSandboxFlags.h" +#include "nsScriptSecurityManager.h" +#include "nsServiceManagerUtils.h" +#include "nsStreamUtils.h" +#include "nsString.h" +#include "nsStringBuffer.h" +#include "nsStringBundle.h" +#include "nsStringFlags.h" +#include "nsStringFwd.h" +#include "nsStringIterator.h" +#include "nsStringStream.h" +#include "nsTArray.h" +#include "nsTLiteralString.h" +#include "nsTPromiseFlatString.h" +#include "nsTStringRepr.h" +#include "nsTextFragment.h" +#include "nsTextNode.h" +#include "nsThreadManager.h" +#include "nsThreadUtils.h" +#include "nsTreeSanitizer.h" +#include "nsUGenCategory.h" +#include "nsURLHelper.h" +#include "nsUnicodeProperties.h" +#include "nsVariant.h" +#include "nsWidgetsCID.h" +#include "nsView.h" +#include "nsViewManager.h" +#include "nsXPCOM.h" +#include "nsXPCOMCID.h" +#include "nsXULAppAPI.h" +#include "nsXULElement.h" +#include "nsXULPopupManager.h" +#include "nscore.h" +#include "prinrval.h" +#include "xpcprivate.h" +#include "xpcpublic.h" + +#if defined(XP_WIN) +// Undefine LoadImage to prevent naming conflict with Windows. +# undef LoadImage +#endif + +extern "C" int MOZ_XMLTranslateEntity(const char* ptr, const char* end, + const char** next, char16_t* result); +extern "C" int MOZ_XMLCheckQName(const char* ptr, const char* end, int ns_aware, + const char** colon); + +using namespace mozilla::dom; +using namespace mozilla::ipc; +using namespace mozilla::gfx; +using namespace mozilla::layers; +using namespace mozilla::widget; +using namespace mozilla; + +const char kLoadAsData[] = "loadAsData"; + +nsIXPConnect* nsContentUtils::sXPConnect; +nsIScriptSecurityManager* nsContentUtils::sSecurityManager; +nsIPrincipal* nsContentUtils::sSystemPrincipal; +nsIPrincipal* nsContentUtils::sNullSubjectPrincipal; +nsIConsoleService* nsContentUtils::sConsoleService; +nsTHashMap<nsRefPtrHashKey<nsAtom>, EventNameMapping>* + nsContentUtils::sAtomEventTable = nullptr; +nsTHashMap<nsStringHashKey, EventNameMapping>* + nsContentUtils::sStringEventTable = nullptr; +nsTArray<RefPtr<nsAtom>>* nsContentUtils::sUserDefinedEvents = nullptr; +nsIStringBundleService* nsContentUtils::sStringBundleService; + +static StaticRefPtr<nsIStringBundle> + sStringBundles[nsContentUtils::PropertiesFile_COUNT]; + +nsIContentPolicy* nsContentUtils::sContentPolicyService; +bool nsContentUtils::sTriedToGetContentPolicy = false; +StaticRefPtr<nsIBidiKeyboard> nsContentUtils::sBidiKeyboard; +uint32_t nsContentUtils::sScriptBlockerCount = 0; +uint32_t nsContentUtils::sDOMNodeRemovedSuppressCount = 0; +AutoTArray<nsCOMPtr<nsIRunnable>, 8>* nsContentUtils::sBlockedScriptRunners = + nullptr; +uint32_t nsContentUtils::sRunnersCountAtFirstBlocker = 0; +nsIInterfaceRequestor* nsContentUtils::sSameOriginChecker = nullptr; + +bool nsContentUtils::sIsHandlingKeyBoardEvent = false; + +nsString* nsContentUtils::sShiftText = nullptr; +nsString* nsContentUtils::sControlText = nullptr; +nsString* nsContentUtils::sMetaText = nullptr; +nsString* nsContentUtils::sOSText = nullptr; +nsString* nsContentUtils::sAltText = nullptr; +nsString* nsContentUtils::sModifierSeparator = nullptr; + +bool nsContentUtils::sInitialized = false; +#ifndef RELEASE_OR_BETA +bool nsContentUtils::sBypassCSSOMOriginCheck = false; +#endif + +nsCString* nsContentUtils::sJSScriptBytecodeMimeType = nullptr; +nsCString* nsContentUtils::sJSModuleBytecodeMimeType = nullptr; + +nsContentUtils::UserInteractionObserver* + nsContentUtils::sUserInteractionObserver = nullptr; + +nsHtml5StringParser* nsContentUtils::sHTMLFragmentParser = nullptr; +nsParser* nsContentUtils::sXMLFragmentParser = nullptr; +nsIFragmentContentSink* nsContentUtils::sXMLFragmentSink = nullptr; +bool nsContentUtils::sFragmentParsingActive = false; + +bool nsContentUtils::sMayHaveFormCheckboxStateChangeListeners = false; +bool nsContentUtils::sMayHaveFormRadioStateChangeListeners = false; + +mozilla::LazyLogModule nsContentUtils::gResistFingerprintingLog( + "nsResistFingerprinting"); +mozilla::LazyLogModule nsContentUtils::sDOMDumpLog("Dump"); + +int32_t nsContentUtils::sInnerOrOuterWindowCount = 0; +uint32_t nsContentUtils::sInnerOrOuterWindowSerialCounter = 0; + +template Maybe<int32_t> nsContentUtils::ComparePoints( + const RangeBoundary& aFirstBoundary, const RangeBoundary& aSecondBoundary); +template Maybe<int32_t> nsContentUtils::ComparePoints( + const RangeBoundary& aFirstBoundary, + const RawRangeBoundary& aSecondBoundary); +template Maybe<int32_t> nsContentUtils::ComparePoints( + const RawRangeBoundary& aFirstBoundary, + const RangeBoundary& aSecondBoundary); +template Maybe<int32_t> nsContentUtils::ComparePoints( + const RawRangeBoundary& aFirstBoundary, + const RawRangeBoundary& aSecondBoundary); + +template int32_t nsContentUtils::ComparePoints_Deprecated( + const RangeBoundary& aFirstBoundary, const RangeBoundary& aSecondBoundary, + bool* aDisconnected); +template int32_t nsContentUtils::ComparePoints_Deprecated( + const RangeBoundary& aFirstBoundary, + const RawRangeBoundary& aSecondBoundary, bool* aDisconnected); +template int32_t nsContentUtils::ComparePoints_Deprecated( + const RawRangeBoundary& aFirstBoundary, + const RangeBoundary& aSecondBoundary, bool* aDisconnected); +template int32_t nsContentUtils::ComparePoints_Deprecated( + const RawRangeBoundary& aFirstBoundary, + const RawRangeBoundary& aSecondBoundary, bool* aDisconnected); + +// Subset of +// http://www.whatwg.org/specs/web-apps/current-work/#autofill-field-name +enum AutocompleteUnsupportedFieldName : uint8_t { +#define AUTOCOMPLETE_UNSUPPORTED_FIELD_NAME(name_, value_) \ + eAutocompleteUnsupportedFieldName_##name_, +#include "AutocompleteFieldList.h" +#undef AUTOCOMPLETE_UNSUPPORTED_FIELD_NAME +}; + +enum AutocompleteNoPersistFieldName : uint8_t { +#define AUTOCOMPLETE_NO_PERSIST_FIELD_NAME(name_, value_) \ + eAutocompleteNoPersistFieldName_##name_, +#include "AutocompleteFieldList.h" +#undef AUTOCOMPLETE_NO_PERSIST_FIELD_NAME +}; + +enum AutocompleteUnsupportFieldContactHint : uint8_t { +#define AUTOCOMPLETE_UNSUPPORTED_FIELD_CONTACT_HINT(name_, value_) \ + eAutocompleteUnsupportedFieldContactHint_##name_, +#include "AutocompleteFieldList.h" +#undef AUTOCOMPLETE_UNSUPPORTED_FIELD_CONTACT_HINT +}; + +enum AutocompleteFieldName : uint8_t { +#define AUTOCOMPLETE_FIELD_NAME(name_, value_) eAutocompleteFieldName_##name_, +#define AUTOCOMPLETE_CONTACT_FIELD_NAME(name_, value_) \ + AUTOCOMPLETE_FIELD_NAME(name_, value_) +#include "AutocompleteFieldList.h" +#undef AUTOCOMPLETE_FIELD_NAME +#undef AUTOCOMPLETE_CONTACT_FIELD_NAME +}; + +enum AutocompleteFieldHint : uint8_t { +#define AUTOCOMPLETE_FIELD_HINT(name_, value_) eAutocompleteFieldHint_##name_, +#include "AutocompleteFieldList.h" +#undef AUTOCOMPLETE_FIELD_HINT +}; + +enum AutocompleteFieldContactHint : uint8_t { +#define AUTOCOMPLETE_FIELD_CONTACT_HINT(name_, value_) \ + eAutocompleteFieldContactHint_##name_, +#include "AutocompleteFieldList.h" +#undef AUTOCOMPLETE_FIELD_CONTACT_HINT +}; + +enum AutocompleteCategory { +#define AUTOCOMPLETE_CATEGORY(name_, value_) eAutocompleteCategory_##name_, +#include "AutocompleteFieldList.h" +#undef AUTOCOMPLETE_CATEGORY +}; + +static const nsAttrValue::EnumTable kAutocompleteUnsupportedFieldNameTable[] = { +#define AUTOCOMPLETE_UNSUPPORTED_FIELD_NAME(name_, value_) \ + {value_, eAutocompleteUnsupportedFieldName_##name_}, +#include "AutocompleteFieldList.h" +#undef AUTOCOMPLETE_UNSUPPORTED_FIELD_NAME + {nullptr, 0}}; + +static const nsAttrValue::EnumTable kAutocompleteNoPersistFieldNameTable[] = { +#define AUTOCOMPLETE_NO_PERSIST_FIELD_NAME(name_, value_) \ + {value_, eAutocompleteNoPersistFieldName_##name_}, +#include "AutocompleteFieldList.h" +#undef AUTOCOMPLETE_NO_PERSIST_FIELD_NAME + {nullptr, 0}}; + +static const nsAttrValue::EnumTable + kAutocompleteUnsupportedContactFieldHintTable[] = { +#define AUTOCOMPLETE_UNSUPPORTED_FIELD_CONTACT_HINT(name_, value_) \ + {value_, eAutocompleteUnsupportedFieldContactHint_##name_}, +#include "AutocompleteFieldList.h" +#undef AUTOCOMPLETE_UNSUPPORTED_FIELD_CONTACT_HINT + {nullptr, 0}}; + +static const nsAttrValue::EnumTable kAutocompleteFieldNameTable[] = { +#define AUTOCOMPLETE_FIELD_NAME(name_, value_) \ + {value_, eAutocompleteFieldName_##name_}, +#include "AutocompleteFieldList.h" +#undef AUTOCOMPLETE_FIELD_NAME + {nullptr, 0}}; + +static const nsAttrValue::EnumTable kAutocompleteContactFieldNameTable[] = { +#define AUTOCOMPLETE_CONTACT_FIELD_NAME(name_, value_) \ + {value_, eAutocompleteFieldName_##name_}, +#include "AutocompleteFieldList.h" +#undef AUTOCOMPLETE_CONTACT_FIELD_NAME + {nullptr, 0}}; + +static const nsAttrValue::EnumTable kAutocompleteFieldHintTable[] = { +#define AUTOCOMPLETE_FIELD_HINT(name_, value_) \ + {value_, eAutocompleteFieldHint_##name_}, +#include "AutocompleteFieldList.h" +#undef AUTOCOMPLETE_FIELD_HINT + {nullptr, 0}}; + +static const nsAttrValue::EnumTable kAutocompleteContactFieldHintTable[] = { +#define AUTOCOMPLETE_FIELD_CONTACT_HINT(name_, value_) \ + {value_, eAutocompleteFieldContactHint_##name_}, +#include "AutocompleteFieldList.h" +#undef AUTOCOMPLETE_FIELD_CONTACT_HINT + {nullptr, 0}}; + +namespace { + +static PLDHashTable* sEventListenerManagersHash; + +// A global hashtable to for keeping the arena alive for cross docGroup node +// adoption. +static nsRefPtrHashtable<nsPtrHashKey<const nsINode>, mozilla::dom::DOMArena>* + sDOMArenaHashtable; + +class DOMEventListenerManagersHashReporter final : public nsIMemoryReporter { + MOZ_DEFINE_MALLOC_SIZE_OF(MallocSizeOf) + + ~DOMEventListenerManagersHashReporter() = default; + + public: + NS_DECL_ISUPPORTS + + NS_IMETHOD CollectReports(nsIHandleReportCallback* aHandleReport, + nsISupports* aData, bool aAnonymize) override { + // We don't measure the |EventListenerManager| objects pointed to by the + // entries because those references are non-owning. + int64_t amount = + sEventListenerManagersHash + ? sEventListenerManagersHash->ShallowSizeOfIncludingThis( + MallocSizeOf) + : 0; + + MOZ_COLLECT_REPORT( + "explicit/dom/event-listener-managers-hash", KIND_HEAP, UNITS_BYTES, + amount, "Memory used by the event listener manager's hash table."); + + return NS_OK; + } +}; + +NS_IMPL_ISUPPORTS(DOMEventListenerManagersHashReporter, nsIMemoryReporter) + +class EventListenerManagerMapEntry : public PLDHashEntryHdr { + public: + explicit EventListenerManagerMapEntry(const void* aKey) : mKey(aKey) {} + + ~EventListenerManagerMapEntry() { + NS_ASSERTION(!mListenerManager, "caller must release and disconnect ELM"); + } + + protected: // declared protected to silence clang warnings + const void* mKey; // must be first, to look like PLDHashEntryStub + + public: + RefPtr<EventListenerManager> mListenerManager; +}; + +static void EventListenerManagerHashInitEntry(PLDHashEntryHdr* entry, + const void* key) { + // Initialize the entry with placement new + new (entry) EventListenerManagerMapEntry(key); +} + +static void EventListenerManagerHashClearEntry(PLDHashTable* table, + PLDHashEntryHdr* entry) { + EventListenerManagerMapEntry* lm = + static_cast<EventListenerManagerMapEntry*>(entry); + + // Let the EventListenerManagerMapEntry clean itself up... + lm->~EventListenerManagerMapEntry(); +} + +class SameOriginCheckerImpl final : public nsIChannelEventSink, + public nsIInterfaceRequestor { + ~SameOriginCheckerImpl() = default; + + NS_DECL_ISUPPORTS + NS_DECL_NSICHANNELEVENTSINK + NS_DECL_NSIINTERFACEREQUESTOR +}; + +} // namespace + +void AutoSuppressEventHandling::SuppressDocument(Document* aDoc) { + // Note: Document::SuppressEventHandling will also automatically suppress + // event handling for any in-process sub-documents. However, since we need + // to deal with cases where remote BrowsingContexts may be interleaved + // with in-process ones, we still need to walk the entire tree ourselves. + // This may be slightly redundant in some cases, but since event handling + // suppressions maintain a count of current blockers, it does not cause + // any problems. + aDoc->SuppressEventHandling(); +} + +void AutoSuppressEventHandling::UnsuppressDocument(Document* aDoc) { + aDoc->UnsuppressEventHandlingAndFireEvents(true); +} + +AutoSuppressEventHandling::~AutoSuppressEventHandling() { + UnsuppressDocuments(); +} + +void AutoSuppressEventHandlingAndSuspend::SuppressDocument(Document* aDoc) { + AutoSuppressEventHandling::SuppressDocument(aDoc); + if (nsCOMPtr<nsPIDOMWindowInner> win = aDoc->GetInnerWindow()) { + win->Suspend(); + mWindows.AppendElement(win); + } +} + +AutoSuppressEventHandlingAndSuspend::~AutoSuppressEventHandlingAndSuspend() { + for (const auto& win : mWindows) { + win->Resume(); + } +} + +/** + * This class is used to determine whether or not the user is currently + * interacting with the browser. It listens to observer events to toggle the + * value of the sUserActive static. + * + * This class is an internal implementation detail. + * nsContentUtils::GetUserIsInteracting() should be used to access current + * user interaction status. + */ +class nsContentUtils::UserInteractionObserver final + : public nsIObserver, + public BackgroundHangAnnotator { + public: + NS_DECL_ISUPPORTS + NS_DECL_NSIOBSERVER + + void Init(); + void Shutdown(); + void AnnotateHang(BackgroundHangAnnotations& aAnnotations) override; + + static Atomic<bool> sUserActive; + + private: + ~UserInteractionObserver() = default; +}; + +static constexpr nsLiteralCString kRfpPrefs[] = { + "privacy.resistFingerprinting"_ns, + "privacy.resistFingerprinting.pbmode"_ns, + "privacy.fingerprintingProtection"_ns, + "privacy.fingerprintingProtection.pbmode"_ns, + "privacy.fingerprintingProtection.overrides"_ns, +}; + +static void RecomputeResistFingerprintingAllDocs(const char*, void*) { + AutoTArray<RefPtr<BrowsingContextGroup>, 5> bcGroups; + BrowsingContextGroup::GetAllGroups(bcGroups); + for (auto& bcGroup : bcGroups) { + AutoTArray<DocGroup*, 5> docGroups; + bcGroup->GetDocGroups(docGroups); + for (auto* docGroup : docGroups) { + for (Document* doc : *docGroup) { + if (doc->RecomputeResistFingerprinting()) { + if (auto* pc = doc->GetPresContext()) { + pc->MediaFeatureValuesChanged( + {MediaFeatureChangeReason::PreferenceChange}, + MediaFeatureChangePropagation::JustThisDocument); + } + } + } + } + } +} + +// static +nsresult nsContentUtils::Init() { + if (sInitialized) { + NS_WARNING("Init() called twice"); + + return NS_OK; + } + + nsHTMLTags::AddRefTable(); + + sXPConnect = nsXPConnect::XPConnect(); + // We hold a strong ref to sXPConnect to ensure that it does not go away until + // nsLayoutStatics::Shutdown is happening. Otherwise ~nsXPConnect can be + // triggered by xpcModuleDtor late in shutdown and cause crashes due to + // various stuff already being torn down by then. Note that this means that + // we are effectively making sure that if we leak nsLayoutStatics then we also + // leak nsXPConnect. + NS_ADDREF(sXPConnect); + + sSecurityManager = nsScriptSecurityManager::GetScriptSecurityManager(); + if (!sSecurityManager) return NS_ERROR_FAILURE; + NS_ADDREF(sSecurityManager); + + sSecurityManager->GetSystemPrincipal(&sSystemPrincipal); + MOZ_ASSERT(sSystemPrincipal); + + RefPtr<NullPrincipal> nullPrincipal = + NullPrincipal::CreateWithoutOriginAttributes(); + if (!nullPrincipal) { + return NS_ERROR_FAILURE; + } + + nullPrincipal.forget(&sNullSubjectPrincipal); + + if (!InitializeEventTable()) return NS_ERROR_FAILURE; + + if (!sEventListenerManagersHash) { + static const PLDHashTableOps hash_table_ops = { + PLDHashTable::HashVoidPtrKeyStub, PLDHashTable::MatchEntryStub, + PLDHashTable::MoveEntryStub, EventListenerManagerHashClearEntry, + EventListenerManagerHashInitEntry}; + + sEventListenerManagersHash = + new PLDHashTable(&hash_table_ops, sizeof(EventListenerManagerMapEntry)); + + RegisterStrongMemoryReporter(new DOMEventListenerManagersHashReporter()); + } + + sBlockedScriptRunners = new AutoTArray<nsCOMPtr<nsIRunnable>, 8>; + +#ifndef RELEASE_OR_BETA + sBypassCSSOMOriginCheck = getenv("MOZ_BYPASS_CSSOM_ORIGIN_CHECK"); +#endif + + Element::InitCCCallbacks(); + + Unused << nsRFPService::GetOrCreate(); + + if (XRE_IsParentProcess()) { + AsyncPrecreateStringBundles(); + } + + RefPtr<UserInteractionObserver> uio = new UserInteractionObserver(); + uio->Init(); + uio.forget(&sUserInteractionObserver); + + for (const auto& pref : kRfpPrefs) { + Preferences::RegisterCallback(RecomputeResistFingerprintingAllDocs, pref); + } + + sInitialized = true; + + return NS_OK; +} + +bool nsContentUtils::InitJSBytecodeMimeType() { + MOZ_ASSERT(NS_IsMainThread()); + MOZ_ASSERT(!sJSScriptBytecodeMimeType); + MOZ_ASSERT(!sJSModuleBytecodeMimeType); + + JS::BuildIdCharVector jsBuildId; + if (!JS::GetScriptTranscodingBuildId(&jsBuildId)) { + return false; + } + + nsDependentCSubstring jsBuildIdStr(jsBuildId.begin(), jsBuildId.length()); + sJSScriptBytecodeMimeType = + new nsCString("javascript/moz-script-bytecode-"_ns + jsBuildIdStr); + sJSModuleBytecodeMimeType = + new nsCString("javascript/moz-module-bytecode-"_ns + jsBuildIdStr); + return true; +} + +void nsContentUtils::GetShiftText(nsAString& text) { + if (!sShiftText) InitializeModifierStrings(); + text.Assign(*sShiftText); +} + +void nsContentUtils::GetControlText(nsAString& text) { + if (!sControlText) InitializeModifierStrings(); + text.Assign(*sControlText); +} + +void nsContentUtils::GetMetaText(nsAString& text) { + if (!sMetaText) InitializeModifierStrings(); + text.Assign(*sMetaText); +} + +void nsContentUtils::GetOSText(nsAString& text) { + if (!sOSText) { + InitializeModifierStrings(); + } + text.Assign(*sOSText); +} + +void nsContentUtils::GetAltText(nsAString& text) { + if (!sAltText) InitializeModifierStrings(); + text.Assign(*sAltText); +} + +void nsContentUtils::GetModifierSeparatorText(nsAString& text) { + if (!sModifierSeparator) InitializeModifierStrings(); + text.Assign(*sModifierSeparator); +} + +void nsContentUtils::InitializeModifierStrings() { + // load the display strings for the keyboard accelerators + nsCOMPtr<nsIStringBundleService> bundleService = + mozilla::components::StringBundle::Service(); + nsCOMPtr<nsIStringBundle> bundle; + DebugOnly<nsresult> rv = NS_OK; + if (bundleService) { + rv = bundleService->CreateBundle( + "chrome://global-platform/locale/platformKeys.properties", + getter_AddRefs(bundle)); + } + + NS_ASSERTION( + NS_SUCCEEDED(rv) && bundle, + "chrome://global/locale/platformKeys.properties could not be loaded"); + nsAutoString shiftModifier; + nsAutoString metaModifier; + nsAutoString osModifier; + nsAutoString altModifier; + nsAutoString controlModifier; + nsAutoString modifierSeparator; + if (bundle) { + // macs use symbols for each modifier key, so fetch each from the bundle, + // which also covers i18n + bundle->GetStringFromName("VK_SHIFT", shiftModifier); + bundle->GetStringFromName("VK_META", metaModifier); + bundle->GetStringFromName("VK_WIN", osModifier); + bundle->GetStringFromName("VK_ALT", altModifier); + bundle->GetStringFromName("VK_CONTROL", controlModifier); + bundle->GetStringFromName("MODIFIER_SEPARATOR", modifierSeparator); + } + // if any of these don't exist, we get an empty string + sShiftText = new nsString(shiftModifier); + sMetaText = new nsString(metaModifier); + sOSText = new nsString(osModifier); + sAltText = new nsString(altModifier); + sControlText = new nsString(controlModifier); + sModifierSeparator = new nsString(modifierSeparator); +} + +mozilla::EventClassID nsContentUtils::GetEventClassIDFromMessage( + EventMessage aEventMessage) { + switch (aEventMessage) { +#define MESSAGE_TO_EVENT(name_, message_, type_, struct_) \ + case message_: \ + return struct_; +#include "mozilla/EventNameList.h" +#undef MESSAGE_TO_EVENT + default: + MOZ_ASSERT_UNREACHABLE("Invalid event message?"); + return eBasicEventClass; + } +} + +bool nsContentUtils::IsExternalProtocol(nsIURI* aURI) { + bool doesNotReturnData = false; + nsresult rv = NS_URIChainHasFlags( + aURI, nsIProtocolHandler::URI_DOES_NOT_RETURN_DATA, &doesNotReturnData); + return NS_SUCCEEDED(rv) && doesNotReturnData; +} + +static nsAtom* GetEventTypeFromMessage(EventMessage aEventMessage) { + switch (aEventMessage) { +#define MESSAGE_TO_EVENT(name_, message_, type_, struct_) \ + case message_: \ + return nsGkAtoms::on##name_; +#include "mozilla/EventNameList.h" +#undef MESSAGE_TO_EVENT + default: + return nullptr; + } +} + +// Because of SVG/SMIL we have several atoms mapped to the same +// id, but we can rely on MESSAGE_TO_EVENT to map id to only one atom. +static bool ShouldAddEventToStringEventTable(const EventNameMapping& aMapping) { + MOZ_ASSERT(aMapping.mAtom); + return GetEventTypeFromMessage(aMapping.mMessage) == aMapping.mAtom; +} + +bool nsContentUtils::InitializeEventTable() { + NS_ASSERTION(!sAtomEventTable, "EventTable already initialized!"); + NS_ASSERTION(!sStringEventTable, "EventTable already initialized!"); + + static const EventNameMapping eventArray[] = { +#define EVENT(name_, _message, _type, _class) \ + {nsGkAtoms::on##name_, _type, _message, _class, false}, +#define WINDOW_ONLY_EVENT EVENT +#define DOCUMENT_ONLY_EVENT EVENT +#define NON_IDL_EVENT EVENT +#include "mozilla/EventNameList.h" +#undef WINDOW_ONLY_EVENT +#undef NON_IDL_EVENT +#undef EVENT + {nullptr}}; + + sAtomEventTable = new nsTHashMap<nsRefPtrHashKey<nsAtom>, EventNameMapping>( + ArrayLength(eventArray)); + sStringEventTable = new nsTHashMap<nsStringHashKey, EventNameMapping>( + ArrayLength(eventArray)); + sUserDefinedEvents = new nsTArray<RefPtr<nsAtom>>(64); + + // Subtract one from the length because of the trailing null + for (uint32_t i = 0; i < ArrayLength(eventArray) - 1; ++i) { + MOZ_ASSERT(!sAtomEventTable->Contains(eventArray[i].mAtom), + "Double-defining event name; fix your EventNameList.h"); + sAtomEventTable->InsertOrUpdate(eventArray[i].mAtom, eventArray[i]); + if (ShouldAddEventToStringEventTable(eventArray[i])) { + sStringEventTable->InsertOrUpdate( + Substring(nsDependentAtomString(eventArray[i].mAtom), 2), + eventArray[i]); + } + } + + return true; +} + +void nsContentUtils::InitializeTouchEventTable() { + static bool sEventTableInitialized = false; + if (!sEventTableInitialized && sAtomEventTable && sStringEventTable) { + sEventTableInitialized = true; + static const EventNameMapping touchEventArray[] = { +#define EVENT(name_, _message, _type, _class) +#define TOUCH_EVENT(name_, _message, _type, _class) \ + {nsGkAtoms::on##name_, _type, _message, _class}, +#include "mozilla/EventNameList.h" +#undef TOUCH_EVENT +#undef EVENT + {nullptr}}; + // Subtract one from the length because of the trailing null + for (uint32_t i = 0; i < ArrayLength(touchEventArray) - 1; ++i) { + sAtomEventTable->InsertOrUpdate(touchEventArray[i].mAtom, + touchEventArray[i]); + sStringEventTable->InsertOrUpdate( + Substring(nsDependentAtomString(touchEventArray[i].mAtom), 2), + touchEventArray[i]); + } + } +} + +static bool Is8bit(const nsAString& aString) { + static const char16_t EIGHT_BIT = char16_t(~0x00FF); + + for (nsAString::const_char_iterator start = aString.BeginReading(), + end = aString.EndReading(); + start != end; ++start) { + if (*start & EIGHT_BIT) { + return false; + } + } + + return true; +} + +nsresult nsContentUtils::Btoa(const nsAString& aBinaryData, + nsAString& aAsciiBase64String) { + if (!Is8bit(aBinaryData)) { + aAsciiBase64String.Truncate(); + return NS_ERROR_DOM_INVALID_CHARACTER_ERR; + } + + return Base64Encode(aBinaryData, aAsciiBase64String); +} + +nsresult nsContentUtils::Atob(const nsAString& aAsciiBase64String, + nsAString& aBinaryData) { + if (!Is8bit(aAsciiBase64String)) { + aBinaryData.Truncate(); + return NS_ERROR_DOM_INVALID_CHARACTER_ERR; + } + + const char16_t* start = aAsciiBase64String.BeginReading(); + const char16_t* cur = start; + const char16_t* end = aAsciiBase64String.EndReading(); + bool hasWhitespace = false; + + while (cur < end) { + if (nsContentUtils::IsHTMLWhitespace(*cur)) { + hasWhitespace = true; + break; + } + cur++; + } + + nsresult rv; + + if (hasWhitespace) { + nsString trimmedString; + + if (!trimmedString.SetCapacity(aAsciiBase64String.Length(), fallible)) { + return NS_ERROR_DOM_INVALID_CHARACTER_ERR; + } + + trimmedString.Append(start, cur - start); + + while (cur < end) { + if (!nsContentUtils::IsHTMLWhitespace(*cur)) { + trimmedString.Append(*cur); + } + cur++; + } + rv = Base64Decode(trimmedString, aBinaryData); + } else { + rv = Base64Decode(aAsciiBase64String, aBinaryData); + } + + if (NS_FAILED(rv) && rv == NS_ERROR_INVALID_ARG) { + return NS_ERROR_DOM_INVALID_CHARACTER_ERR; + } + return rv; +} + +bool nsContentUtils::IsAutocompleteEnabled( + mozilla::dom::HTMLInputElement* aInput) { + MOZ_ASSERT(aInput, "aInput should not be null!"); + + nsAutoString autocomplete; + aInput->GetAutocomplete(autocomplete); + + if (autocomplete.IsEmpty()) { + auto* form = aInput->GetForm(); + if (!form) { + return true; + } + + form->GetAutocomplete(autocomplete); + } + + return !autocomplete.EqualsLiteral("off"); +} + +nsContentUtils::AutocompleteAttrState +nsContentUtils::SerializeAutocompleteAttribute( + const nsAttrValue* aAttr, nsAString& aResult, + AutocompleteAttrState aCachedState) { + if (!aAttr || + aCachedState == nsContentUtils::eAutocompleteAttrState_Invalid) { + return aCachedState; + } + + if (aCachedState == nsContentUtils::eAutocompleteAttrState_Valid) { + uint32_t atomCount = aAttr->GetAtomCount(); + for (uint32_t i = 0; i < atomCount; i++) { + if (i != 0) { + aResult.Append(' '); + } + aResult.Append(nsDependentAtomString(aAttr->AtomAt(i))); + } + nsContentUtils::ASCIIToLower(aResult); + return aCachedState; + } + + aResult.Truncate(); + + mozilla::dom::AutocompleteInfo info; + AutocompleteAttrState state = + InternalSerializeAutocompleteAttribute(aAttr, info); + if (state == eAutocompleteAttrState_Valid) { + // Concatenate the info fields. + aResult = info.mSection; + + if (!info.mAddressType.IsEmpty()) { + if (!aResult.IsEmpty()) { + aResult += ' '; + } + aResult += info.mAddressType; + } + + if (!info.mContactType.IsEmpty()) { + if (!aResult.IsEmpty()) { + aResult += ' '; + } + aResult += info.mContactType; + } + + if (!info.mFieldName.IsEmpty()) { + if (!aResult.IsEmpty()) { + aResult += ' '; + } + aResult += info.mFieldName; + } + } + + return state; +} + +nsContentUtils::AutocompleteAttrState +nsContentUtils::SerializeAutocompleteAttribute( + const nsAttrValue* aAttr, mozilla::dom::AutocompleteInfo& aInfo, + AutocompleteAttrState aCachedState, bool aGrantAllValidValue) { + if (!aAttr || + aCachedState == nsContentUtils::eAutocompleteAttrState_Invalid) { + return aCachedState; + } + + return InternalSerializeAutocompleteAttribute(aAttr, aInfo, + aGrantAllValidValue); +} + +/** + * Helper to validate the @autocomplete tokens. + * + * @return {AutocompleteAttrState} The state of the attribute (invalid/valid). + */ +nsContentUtils::AutocompleteAttrState +nsContentUtils::InternalSerializeAutocompleteAttribute( + const nsAttrValue* aAttrVal, mozilla::dom::AutocompleteInfo& aInfo, + bool aGrantAllValidValue) { + // No autocomplete attribute so we are done + if (!aAttrVal) { + return eAutocompleteAttrState_Invalid; + } + + uint32_t numTokens = aAttrVal->GetAtomCount(); + if (!numTokens) { + return eAutocompleteAttrState_Invalid; + } + + uint32_t index = numTokens - 1; + nsString tokenString = nsDependentAtomString(aAttrVal->AtomAt(index)); + AutocompleteCategory category; + nsAttrValue enumValue; + + bool unsupported = false; + if (!aGrantAllValidValue) { + unsupported = enumValue.ParseEnumValue( + tokenString, kAutocompleteUnsupportedFieldNameTable, false); + if (unsupported) { + return eAutocompleteAttrState_Invalid; + } + } + + nsAutoString str; + bool result = + enumValue.ParseEnumValue(tokenString, kAutocompleteFieldNameTable, false); + if (result) { + // Off/Automatic/Normal categories. + if (enumValue.Equals(u"off"_ns, eIgnoreCase) || + enumValue.Equals(u"on"_ns, eIgnoreCase)) { + if (numTokens > 1) { + return eAutocompleteAttrState_Invalid; + } + enumValue.ToString(str); + ASCIIToLower(str); + aInfo.mFieldName.Assign(str); + aInfo.mCanAutomaticallyPersist = + !enumValue.Equals(u"off"_ns, eIgnoreCase); + return eAutocompleteAttrState_Valid; + } + + // Only allow on/off if form autofill @autocomplete values aren't enabled + // and it doesn't grant all valid values. + if (!StaticPrefs::dom_forms_autocomplete_formautofill() && + !aGrantAllValidValue) { + return eAutocompleteAttrState_Invalid; + } + + // Normal category + if (numTokens > 3) { + return eAutocompleteAttrState_Invalid; + } + category = eAutocompleteCategory_NORMAL; + } else { // Check if the last token is of the contact category instead. + // Only allow on/off if form autofill @autocomplete values aren't enabled + // and it doesn't grant all valid values. + if (!StaticPrefs::dom_forms_autocomplete_formautofill() && + !aGrantAllValidValue) { + return eAutocompleteAttrState_Invalid; + } + + result = enumValue.ParseEnumValue( + tokenString, kAutocompleteContactFieldNameTable, false); + if (!result || numTokens > 4) { + return eAutocompleteAttrState_Invalid; + } + + category = eAutocompleteCategory_CONTACT; + } + + enumValue.ToString(str); + ASCIIToLower(str); + aInfo.mFieldName.Assign(str); + + aInfo.mCanAutomaticallyPersist = !enumValue.ParseEnumValue( + tokenString, kAutocompleteNoPersistFieldNameTable, false); + + // We are done if this was the only token. + if (numTokens == 1) { + return eAutocompleteAttrState_Valid; + } + + --index; + tokenString = nsDependentAtomString(aAttrVal->AtomAt(index)); + + if (category == eAutocompleteCategory_CONTACT) { + if (!aGrantAllValidValue) { + unsupported = enumValue.ParseEnumValue( + tokenString, kAutocompleteUnsupportedContactFieldHintTable, false); + if (unsupported) { + return eAutocompleteAttrState_Invalid; + } + } + + nsAttrValue contactFieldHint; + result = contactFieldHint.ParseEnumValue( + tokenString, kAutocompleteContactFieldHintTable, false); + if (result) { + nsAutoString contactFieldHintString; + contactFieldHint.ToString(contactFieldHintString); + ASCIIToLower(contactFieldHintString); + aInfo.mContactType.Assign(contactFieldHintString); + if (index == 0) { + return eAutocompleteAttrState_Valid; + } + --index; + tokenString = nsDependentAtomString(aAttrVal->AtomAt(index)); + } + } + + // Check for billing/shipping tokens + nsAttrValue fieldHint; + if (fieldHint.ParseEnumValue(tokenString, kAutocompleteFieldHintTable, + false)) { + nsString fieldHintString; + fieldHint.ToString(fieldHintString); + ASCIIToLower(fieldHintString); + aInfo.mAddressType.Assign(fieldHintString); + if (index == 0) { + return eAutocompleteAttrState_Valid; + } + --index; + tokenString = nsDependentAtomString(aAttrVal->AtomAt(index)); + } + + // Check for section-* token + const nsDependentSubstring& section = Substring(tokenString, 0, 8); + if (section.LowerCaseEqualsASCII("section-")) { + ASCIIToLower(tokenString); + aInfo.mSection.Assign(tokenString); + if (index == 0) { + return eAutocompleteAttrState_Valid; + } + } + + // Clear the fields as the autocomplete attribute is invalid. + aInfo.mSection.Truncate(); + aInfo.mAddressType.Truncate(); + aInfo.mContactType.Truncate(); + aInfo.mFieldName.Truncate(); + + return eAutocompleteAttrState_Invalid; +} + +// Parse an integer according to HTML spec +template <class CharT> +int32_t nsContentUtils::ParseHTMLIntegerImpl( + const CharT* aStart, const CharT* aEnd, + ParseHTMLIntegerResultFlags* aResult) { + int result = eParseHTMLInteger_NoFlags; + + const CharT* iter = aStart; + + while (iter != aEnd && nsContentUtils::IsHTMLWhitespace(*iter)) { + result |= eParseHTMLInteger_NonStandard; + ++iter; + } + + if (iter == aEnd) { + result |= eParseHTMLInteger_Error | eParseHTMLInteger_ErrorNoValue; + *aResult = (ParseHTMLIntegerResultFlags)result; + return 0; + } + + int sign = 1; + if (*iter == CharT('-')) { + sign = -1; + result |= eParseHTMLInteger_Negative; + ++iter; + } else if (*iter == CharT('+')) { + result |= eParseHTMLInteger_NonStandard; + ++iter; + } + + bool foundValue = false; + CheckedInt32 value = 0; + + // Check for leading zeros first. + uint64_t leadingZeros = 0; + while (iter != aEnd) { + if (*iter != CharT('0')) { + break; + } + + ++leadingZeros; + foundValue = true; + ++iter; + } + + while (iter != aEnd) { + if (*iter >= CharT('0') && *iter <= CharT('9')) { + value = (value * 10) + (*iter - CharT('0')) * sign; + ++iter; + if (!value.isValid()) { + result |= eParseHTMLInteger_Error | eParseHTMLInteger_ErrorOverflow; + break; + } + foundValue = true; + } else { + break; + } + } + + if (!foundValue) { + result |= eParseHTMLInteger_Error | eParseHTMLInteger_ErrorNoValue; + } + + if (value.isValid() && + ((leadingZeros > 1 || (leadingZeros == 1 && !(value == 0))) || + (sign == -1 && value == 0))) { + result |= eParseHTMLInteger_NonStandard; + } + + if (iter != aEnd) { + result |= eParseHTMLInteger_DidNotConsumeAllInput; + } + + *aResult = (ParseHTMLIntegerResultFlags)result; + return value.isValid() ? value.value() : 0; +} + +// Parse an integer according to HTML spec +int32_t nsContentUtils::ParseHTMLInteger(const char16_t* aStart, + const char16_t* aEnd, + ParseHTMLIntegerResultFlags* aResult) { + return ParseHTMLIntegerImpl(aStart, aEnd, aResult); +} + +int32_t nsContentUtils::ParseHTMLInteger(const char* aStart, const char* aEnd, + ParseHTMLIntegerResultFlags* aResult) { + return ParseHTMLIntegerImpl(aStart, aEnd, aResult); +} + +#define SKIP_WHITESPACE(iter, end_iter, end_res) \ + while ((iter) != (end_iter) && nsCRT::IsAsciiSpace(*(iter))) { \ + ++(iter); \ + } \ + if ((iter) == (end_iter)) { \ + return (end_res); \ + } + +#define SKIP_ATTR_NAME(iter, end_iter) \ + while ((iter) != (end_iter) && !nsCRT::IsAsciiSpace(*(iter)) && \ + *(iter) != '=') { \ + ++(iter); \ + } + +bool nsContentUtils::GetPseudoAttributeValue(const nsString& aSource, + nsAtom* aName, nsAString& aValue) { + aValue.Truncate(); + + const char16_t* start = aSource.get(); + const char16_t* end = start + aSource.Length(); + const char16_t* iter; + + while (start != end) { + SKIP_WHITESPACE(start, end, false) + iter = start; + SKIP_ATTR_NAME(iter, end) + + if (start == iter) { + return false; + } + + // Remember the attr name. + const nsDependentSubstring& attrName = Substring(start, iter); + + // Now check whether this is a valid name="value" pair. + start = iter; + SKIP_WHITESPACE(start, end, false) + if (*start != '=') { + // No '=', so this is not a name="value" pair. We don't know + // what it is, and we have no way to handle it. + return false; + } + + // Have to skip the value. + ++start; + SKIP_WHITESPACE(start, end, false) + char16_t q = *start; + if (q != kQuote && q != kApostrophe) { + // Not a valid quoted value, so bail. + return false; + } + + ++start; // Point to the first char of the value. + iter = start; + + while (iter != end && *iter != q) { + ++iter; + } + + if (iter == end) { + // Oops, unterminated quoted string. + return false; + } + + // At this point attrName holds the name of the "attribute" and + // the value is between start and iter. + + if (aName->Equals(attrName)) { + // We'll accumulate as many characters as possible (until we hit either + // the end of the string or the beginning of an entity). Chunks will be + // delimited by start and chunkEnd. + const char16_t* chunkEnd = start; + while (chunkEnd != iter) { + if (*chunkEnd == kLessThan) { + aValue.Truncate(); + + return false; + } + + if (*chunkEnd == kAmpersand) { + aValue.Append(start, chunkEnd - start); + + const char16_t* afterEntity = nullptr; + char16_t result[2]; + uint32_t count = MOZ_XMLTranslateEntity( + reinterpret_cast<const char*>(chunkEnd), + reinterpret_cast<const char*>(iter), + reinterpret_cast<const char**>(&afterEntity), result); + if (count == 0) { + aValue.Truncate(); + + return false; + } + + aValue.Append(result, count); + + // Advance to after the entity and begin a new chunk. + start = chunkEnd = afterEntity; + } else { + ++chunkEnd; + } + } + + // Append remainder. + aValue.Append(start, iter - start); + + return true; + } + + // Resume scanning after the end of the attribute value (past the quote + // char). + start = iter + 1; + } + + return false; +} + +bool nsContentUtils::IsJavaScriptLanguage(const nsString& aName) { + // Create MIME type as "text/" + given input + nsAutoString mimeType(u"text/"); + mimeType.Append(aName); + + return IsJavascriptMIMEType(mimeType); +} + +void nsContentUtils::SplitMimeType(const nsAString& aValue, nsString& aType, + nsString& aParams) { + aType.Truncate(); + aParams.Truncate(); + int32_t semiIndex = aValue.FindChar(char16_t(';')); + if (-1 != semiIndex) { + aType = Substring(aValue, 0, semiIndex); + aParams = + Substring(aValue, semiIndex + 1, aValue.Length() - (semiIndex + 1)); + aParams.StripWhitespace(); + } else { + aType = aValue; + } + aType.StripWhitespace(); +} + +/** + * A helper function that parses a sandbox attribute (of an <iframe> or a CSP + * directive) and converts it to the set of flags used internally. + * + * @param aSandboxAttr the sandbox attribute + * @return the set of flags (SANDBOXED_NONE if aSandboxAttr is + * null) + */ +uint32_t nsContentUtils::ParseSandboxAttributeToFlags( + const nsAttrValue* aSandboxAttr) { + if (!aSandboxAttr) { + return SANDBOXED_NONE; + } + + uint32_t out = SANDBOX_ALL_FLAGS; + +#define SANDBOX_KEYWORD(string, atom, flags) \ + if (aSandboxAttr->Contains(nsGkAtoms::atom, eIgnoreCase)) { \ + out &= ~(flags); \ + } +#include "IframeSandboxKeywordList.h" +#undef SANDBOX_KEYWORD + + return out; +} + +/** + * A helper function that checks if a string matches a valid sandbox flag. + * + * @param aFlag the potential sandbox flag. + * @return true if the flag is a sandbox flag. + */ +bool nsContentUtils::IsValidSandboxFlag(const nsAString& aFlag) { +#define SANDBOX_KEYWORD(string, atom, flags) \ + if (EqualsIgnoreASCIICase(nsDependentAtomString(nsGkAtoms::atom), aFlag)) { \ + return true; \ + } +#include "IframeSandboxKeywordList.h" +#undef SANDBOX_KEYWORD + return false; +} + +/** + * A helper function that returns a string attribute corresponding to the + * sandbox flags. + * + * @param aFlags the sandbox flags + * @param aString the attribute corresponding to the flags (null if aFlags + * is zero) + */ +void nsContentUtils::SandboxFlagsToString(uint32_t aFlags, nsAString& aString) { + if (!aFlags) { + SetDOMStringToNull(aString); + return; + } + + aString.Truncate(); + +#define SANDBOX_KEYWORD(string, atom, flags) \ + if (!(aFlags & (flags))) { \ + if (!aString.IsEmpty()) { \ + aString.AppendLiteral(u" "); \ + } \ + aString.Append(nsDependentAtomString(nsGkAtoms::atom)); \ + } +#include "IframeSandboxKeywordList.h" +#undef SANDBOX_KEYWORD +} + +nsIBidiKeyboard* nsContentUtils::GetBidiKeyboard() { + if (!sBidiKeyboard) { + sBidiKeyboard = nsIWidget::CreateBidiKeyboard(); + } + return sBidiKeyboard; +} + +/** + * This is used to determine whether a character is in one of the classes + * which CSS says should be part of the first-letter. Currently, that is + * all punctuation classes (P*). Note that this is a change from CSS2 + * which excluded Pc and Pd. + * + * https://www.w3.org/TR/css-pseudo-4/#first-letter-pseudo + * "Punctuation (i.e, characters that belong to the Punctuation (P*) Unicode + * general category [UAX44]) [...]" + */ + +// static +bool nsContentUtils::IsFirstLetterPunctuation(uint32_t aChar) { + switch (mozilla::unicode::GetGeneralCategory(aChar)) { + case HB_UNICODE_GENERAL_CATEGORY_CONNECT_PUNCTUATION: /* Pc */ + case HB_UNICODE_GENERAL_CATEGORY_DASH_PUNCTUATION: /* Pd */ + case HB_UNICODE_GENERAL_CATEGORY_CLOSE_PUNCTUATION: /* Pe */ + case HB_UNICODE_GENERAL_CATEGORY_FINAL_PUNCTUATION: /* Pf */ + case HB_UNICODE_GENERAL_CATEGORY_INITIAL_PUNCTUATION: /* Pi */ + case HB_UNICODE_GENERAL_CATEGORY_OTHER_PUNCTUATION: /* Po */ + case HB_UNICODE_GENERAL_CATEGORY_OPEN_PUNCTUATION: /* Ps */ + return true; + default: + return false; + } +} + +// static +bool nsContentUtils::IsAlphanumeric(uint32_t aChar) { + nsUGenCategory cat = mozilla::unicode::GetGenCategory(aChar); + + return (cat == nsUGenCategory::kLetter || cat == nsUGenCategory::kNumber); +} + +// static +bool nsContentUtils::IsAlphanumericOrSymbol(uint32_t aChar) { + nsUGenCategory cat = mozilla::unicode::GetGenCategory(aChar); + + return cat == nsUGenCategory::kLetter || cat == nsUGenCategory::kNumber || + cat == nsUGenCategory::kSymbol; +} + +/* static */ +bool nsContentUtils::IsHTMLWhitespace(char16_t aChar) { + return aChar == char16_t(0x0009) || aChar == char16_t(0x000A) || + aChar == char16_t(0x000C) || aChar == char16_t(0x000D) || + aChar == char16_t(0x0020); +} + +/* static */ +bool nsContentUtils::IsHTMLWhitespaceOrNBSP(char16_t aChar) { + return IsHTMLWhitespace(aChar) || aChar == char16_t(0xA0); +} + +/* static */ +bool nsContentUtils::IsHTMLBlockLevelElement(nsIContent* aContent) { + return aContent->IsAnyOfHTMLElements( + nsGkAtoms::address, nsGkAtoms::article, nsGkAtoms::aside, + nsGkAtoms::blockquote, nsGkAtoms::center, nsGkAtoms::dir, nsGkAtoms::div, + nsGkAtoms::dl, // XXX why not dt and dd? + nsGkAtoms::fieldset, + nsGkAtoms::figure, // XXX shouldn't figcaption be on this list + nsGkAtoms::footer, nsGkAtoms::form, nsGkAtoms::h1, nsGkAtoms::h2, + nsGkAtoms::h3, nsGkAtoms::h4, nsGkAtoms::h5, nsGkAtoms::h6, + nsGkAtoms::header, nsGkAtoms::hgroup, nsGkAtoms::hr, nsGkAtoms::li, + nsGkAtoms::listing, nsGkAtoms::menu, nsGkAtoms::nav, nsGkAtoms::ol, + nsGkAtoms::p, nsGkAtoms::pre, nsGkAtoms::section, nsGkAtoms::table, + nsGkAtoms::ul, nsGkAtoms::xmp); +} + +/* static */ +bool nsContentUtils::ParseIntMarginValue(const nsAString& aString, + nsIntMargin& result) { + nsAutoString marginStr(aString); + marginStr.CompressWhitespace(true, true); + if (marginStr.IsEmpty()) { + return false; + } + + int32_t start = 0, end = 0; + for (int count = 0; count < 4; count++) { + if ((uint32_t)end >= marginStr.Length()) return false; + + // top, right, bottom, left + if (count < 3) + end = Substring(marginStr, start).FindChar(','); + else + end = Substring(marginStr, start).Length(); + + if (end <= 0) return false; + + nsresult ec; + int32_t val = nsString(Substring(marginStr, start, end)).ToInteger(&ec); + if (NS_FAILED(ec)) return false; + + switch (count) { + case 0: + result.top = val; + break; + case 1: + result.right = val; + break; + case 2: + result.bottom = val; + break; + case 3: + result.left = val; + break; + } + start += end + 1; + } + return true; +} + +// static +int32_t nsContentUtils::ParseLegacyFontSize(const nsAString& aValue) { + nsAString::const_iterator iter, end; + aValue.BeginReading(iter); + aValue.EndReading(end); + + while (iter != end && nsContentUtils::IsHTMLWhitespace(*iter)) { + ++iter; + } + + if (iter == end) { + return 0; + } + + bool relative = false; + bool negate = false; + if (*iter == char16_t('-')) { + relative = true; + negate = true; + ++iter; + } else if (*iter == char16_t('+')) { + relative = true; + ++iter; + } + + if (iter == end || *iter < char16_t('0') || *iter > char16_t('9')) { + return 0; + } + + // We don't have to worry about overflow, since we can bail out as soon as + // we're bigger than 7. + int32_t value = 0; + while (iter != end && *iter >= char16_t('0') && *iter <= char16_t('9')) { + value = 10 * value + (*iter - char16_t('0')); + if (value >= 7) { + break; + } + ++iter; + } + + if (relative) { + if (negate) { + value = 3 - value; + } else { + value = 3 + value; + } + } + + return clamped(value, 1, 7); +} + +/* static */ +void nsContentUtils::GetOfflineAppManifest(Document* aDocument, nsIURI** aURI) { + MOZ_ASSERT(NS_IsMainThread()); + MOZ_ASSERT(aDocument); + *aURI = nullptr; + + if (aDocument->GetController().isSome()) { + return; + } + + Element* docElement = aDocument->GetRootElement(); + if (!docElement) { + return; + } + + nsAutoString manifestSpec; + docElement->GetAttr(kNameSpaceID_None, nsGkAtoms::manifest, manifestSpec); + + // Manifest URIs can't have fragment identifiers. + if (manifestSpec.IsEmpty() || manifestSpec.Contains('#')) { + return; + } + + nsContentUtils::NewURIWithDocumentCharset(aURI, manifestSpec, aDocument, + aDocument->GetDocBaseURI()); +} + +/* static */ +bool nsContentUtils::OfflineAppAllowed(nsIURI* aURI) { return false; } + +/* static */ +bool nsContentUtils::OfflineAppAllowed(nsIPrincipal* aPrincipal) { + return false; +} +// Static +bool nsContentUtils::IsErrorPage(nsIURI* aURI) { + if (!aURI) { + return false; + } + + if (!aURI->SchemeIs("about")) { + return false; + } + + nsAutoCString name; + nsresult rv = NS_GetAboutModuleName(aURI, name); + NS_ENSURE_SUCCESS(rv, false); + + return name.EqualsLiteral("certerror") || name.EqualsLiteral("neterror") || + name.EqualsLiteral("blocked"); +} + +// static +void nsContentUtils::Shutdown() { + sInitialized = false; + + nsHTMLTags::ReleaseTable(); + + NS_IF_RELEASE(sContentPolicyService); + sTriedToGetContentPolicy = false; + for (StaticRefPtr<nsIStringBundle>& bundle : sStringBundles) { + bundle = nullptr; + } + + NS_IF_RELEASE(sStringBundleService); + NS_IF_RELEASE(sConsoleService); + NS_IF_RELEASE(sXPConnect); + NS_IF_RELEASE(sSecurityManager); + NS_IF_RELEASE(sSystemPrincipal); + NS_IF_RELEASE(sNullSubjectPrincipal); + + sBidiKeyboard = nullptr; + + delete sAtomEventTable; + sAtomEventTable = nullptr; + delete sStringEventTable; + sStringEventTable = nullptr; + delete sUserDefinedEvents; + sUserDefinedEvents = nullptr; + + if (sEventListenerManagersHash) { + NS_ASSERTION(sEventListenerManagersHash->EntryCount() == 0, + "Event listener manager hash not empty at shutdown!"); + + // See comment above. + + // However, we have to handle this table differently. If it still + // has entries, we want to leak it too, so that we can keep it alive + // in case any elements are destroyed. Because if they are, we need + // their event listener managers to be destroyed too, or otherwise + // it could leave dangling references in DOMClassInfo's preserved + // wrapper table. + + if (sEventListenerManagersHash->EntryCount() == 0) { + delete sEventListenerManagersHash; + sEventListenerManagersHash = nullptr; + } + } + + if (sDOMArenaHashtable) { + MOZ_ASSERT(sDOMArenaHashtable->Count() == 0); + MOZ_ASSERT(StaticPrefs::dom_arena_allocator_enabled_AtStartup()); + delete sDOMArenaHashtable; + sDOMArenaHashtable = nullptr; + } + + NS_ASSERTION(!sBlockedScriptRunners || sBlockedScriptRunners->Length() == 0, + "How'd this happen?"); + delete sBlockedScriptRunners; + sBlockedScriptRunners = nullptr; + + delete sShiftText; + sShiftText = nullptr; + delete sControlText; + sControlText = nullptr; + delete sMetaText; + sMetaText = nullptr; + delete sOSText; + sOSText = nullptr; + delete sAltText; + sAltText = nullptr; + delete sModifierSeparator; + sModifierSeparator = nullptr; + + delete sJSScriptBytecodeMimeType; + sJSScriptBytecodeMimeType = nullptr; + + delete sJSModuleBytecodeMimeType; + sJSModuleBytecodeMimeType = nullptr; + + NS_IF_RELEASE(sSameOriginChecker); + + if (sUserInteractionObserver) { + sUserInteractionObserver->Shutdown(); + NS_RELEASE(sUserInteractionObserver); + } + + for (const auto& pref : kRfpPrefs) { + Preferences::UnregisterCallback(RecomputeResistFingerprintingAllDocs, pref); + } + + TextControlState::Shutdown(); + nsMappedAttributes::Shutdown(); +} + +/** + * Checks whether two nodes come from the same origin. aTrustedNode is + * considered 'safe' in that a user can operate on it. + */ +// static +nsresult nsContentUtils::CheckSameOrigin(const nsINode* aTrustedNode, + const nsINode* unTrustedNode) { + MOZ_ASSERT(aTrustedNode); + MOZ_ASSERT(unTrustedNode); + + /* + * Get hold of each node's principal + */ + + nsIPrincipal* trustedPrincipal = aTrustedNode->NodePrincipal(); + nsIPrincipal* unTrustedPrincipal = unTrustedNode->NodePrincipal(); + + if (trustedPrincipal == unTrustedPrincipal) { + return NS_OK; + } + + bool equal; + // XXXbz should we actually have a Subsumes() check here instead? Or perhaps + // a separate method for that, with callers using one or the other? + if (NS_FAILED(trustedPrincipal->Equals(unTrustedPrincipal, &equal)) || + !equal) { + return NS_ERROR_DOM_PROP_ACCESS_DENIED; + } + + return NS_OK; +} + +// static +bool nsContentUtils::CanCallerAccess(nsIPrincipal* aSubjectPrincipal, + nsIPrincipal* aPrincipal) { + bool subsumes; + nsresult rv = aSubjectPrincipal->Subsumes(aPrincipal, &subsumes); + NS_ENSURE_SUCCESS(rv, false); + + if (subsumes) { + return true; + } + + // The subject doesn't subsume aPrincipal. Allow access only if the subject + // is chrome. + return IsCallerChrome(); +} + +// static +bool nsContentUtils::CanCallerAccess(const nsINode* aNode) { + nsIPrincipal* subject = SubjectPrincipal(); + if (subject->IsSystemPrincipal()) { + return true; + } + + if (aNode->ChromeOnlyAccess()) { + return false; + } + + return CanCallerAccess(subject, aNode->NodePrincipal()); +} + +// static +bool nsContentUtils::CanCallerAccess(nsPIDOMWindowInner* aWindow) { + nsCOMPtr<nsIScriptObjectPrincipal> scriptObject = do_QueryInterface(aWindow); + NS_ENSURE_TRUE(scriptObject, false); + + return CanCallerAccess(SubjectPrincipal(), scriptObject->GetPrincipal()); +} + +// static +bool nsContentUtils::PrincipalHasPermission(nsIPrincipal& aPrincipal, + const nsAtom* aPerm) { + // Chrome gets access by default. + if (aPrincipal.IsSystemPrincipal()) { + return true; + } + + // Otherwise, only allow if caller is an addon with the permission. + return BasePrincipal::Cast(aPrincipal).AddonHasPermission(aPerm); +} + +// static +bool nsContentUtils::CallerHasPermission(JSContext* aCx, const nsAtom* aPerm) { + return PrincipalHasPermission(*SubjectPrincipal(aCx), aPerm); +} + +// static +nsIPrincipal* nsContentUtils::GetAttrTriggeringPrincipal( + nsIContent* aContent, const nsAString& aAttrValue, + nsIPrincipal* aSubjectPrincipal) { + nsIPrincipal* contentPrin = aContent ? aContent->NodePrincipal() : nullptr; + + // If the subject principal is the same as the content principal, or no + // explicit subject principal was provided, we don't need to do any further + // checks. Just return the content principal. + if (contentPrin == aSubjectPrincipal || !aSubjectPrincipal) { + return contentPrin; + } + + // Only use the subject principal if the URL string we are going to end up + // fetching is under the control of that principal, which is never the case + // for relative URLs. + if (aAttrValue.IsEmpty() || + !IsAbsoluteURL(NS_ConvertUTF16toUTF8(aAttrValue))) { + return contentPrin; + } + + // Only use the subject principal as the attr triggering principal if it + // should override the CSP of the node's principal. + if (BasePrincipal::Cast(aSubjectPrincipal)->OverridesCSP(contentPrin)) { + return aSubjectPrincipal; + } + + return contentPrin; +} + +// static +bool nsContentUtils::IsAbsoluteURL(const nsACString& aURL) { + nsAutoCString scheme; + if (NS_FAILED(net_ExtractURLScheme(aURL, scheme))) { + // If we can't extract a scheme, it's not an absolute URL. + return false; + } + + // If it parses as an absolute StandardURL, it's definitely an absolute URL, + // so no need to check with the IO service. + if (net_IsAbsoluteURL(aURL)) { + return true; + } + + nsresult rv = NS_OK; + nsCOMPtr<nsIIOService> io = mozilla::components::IO::Service(&rv); + MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv)); + if (NS_FAILED(rv)) { + return false; + } + + uint32_t flags; + if (NS_SUCCEEDED(io->GetProtocolFlags(scheme.get(), &flags))) { + return flags & nsIProtocolHandler::URI_NORELATIVE; + } + + return false; +} + +// static +bool nsContentUtils::InProlog(nsINode* aNode) { + MOZ_ASSERT(aNode, "missing node to nsContentUtils::InProlog"); + + nsINode* parent = aNode->GetParentNode(); + if (!parent || !parent->IsDocument()) { + return false; + } + + const Document* doc = parent->AsDocument(); + const nsIContent* root = doc->GetRootElement(); + if (!root) { + return true; + } + const Maybe<uint32_t> indexOfNode = doc->ComputeIndexOf(aNode); + const Maybe<uint32_t> indexOfRoot = doc->ComputeIndexOf(root); + if (MOZ_LIKELY(indexOfNode.isSome() && indexOfRoot.isSome())) { + return *indexOfNode < *indexOfRoot; + } + // XXX Keep the odd traditional behavior for now. + return indexOfNode.isNothing() && indexOfRoot.isSome(); +} + +bool nsContentUtils::IsCallerChrome() { + MOZ_ASSERT(NS_IsMainThread()); + return SubjectPrincipal() == sSystemPrincipal; +} + +#ifdef FUZZING +bool nsContentUtils::IsFuzzingEnabled() { + return StaticPrefs::fuzzing_enabled(); +} +#endif + +/* static */ +bool nsContentUtils::IsCallerChromeOrElementTransformGettersEnabled( + JSContext* aCx, JSObject*) { + return ThreadsafeIsSystemCaller(aCx) || + StaticPrefs::dom_element_transform_getters_enabled(); +} + +// Older Should RFP Functions ---------------------------------- + +/* static */ +bool nsContentUtils::ShouldResistFingerprinting( + RFPTarget aTarget /* = RFPTarget::Unknown */) { + return nsRFPService::IsRFPEnabledFor(aTarget); +} + +/* static */ +bool nsContentUtils::ShouldResistFingerprinting(nsIGlobalObject* aGlobalObject, + RFPTarget aTarget) { + if (!aGlobalObject) { + return ShouldResistFingerprinting("Null Object", aTarget); + } + return aGlobalObject->ShouldResistFingerprinting(aTarget); +} + +// Newer Should RFP Functions ---------------------------------- +// Utilities --------------------------------------------------- + +inline void LogDomainAndPrefList(const char* urlType, + const char* exemptedDomainsPrefName, + nsAutoCString& url, bool isExemptDomain) { + nsAutoCString list; + Preferences::GetCString(exemptedDomainsPrefName, list); + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Debug, + ("%s \"%s\" is %s the exempt list \"%s\"", urlType, + PromiseFlatCString(url).get(), isExemptDomain ? "in" : "NOT in", + PromiseFlatCString(list).get())); +} + +inline already_AddRefed<nsICookieJarSettings> GetCookieJarSettings( + nsILoadInfo* aLoadInfo) { + nsCOMPtr<nsICookieJarSettings> cookieJarSettings; + nsresult rv = + aLoadInfo->GetCookieJarSettings(getter_AddRefs(cookieJarSettings)); + if (rv == NS_ERROR_NOT_IMPLEMENTED) { + // The TRRLoadInfo in particular does not implement this method + // In that instance. We will return false and let other code decide if + // we shouldRFP for this connection + return nullptr; + } + if (NS_WARN_IF(NS_FAILED(rv))) { + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Info, + ("Called CookieJarSettingsSaysShouldResistFingerprinting but the " + "loadinfo's CookieJarSettings couldn't be retrieved")); + return nullptr; + } + + MOZ_ASSERT(cookieJarSettings); + return cookieJarSettings.forget(); +} + +bool ETPSaysShouldNotResistFingerprinting(nsIChannel* aChannel, + nsILoadInfo* aLoadInfo) { + // A positive return from this function should always be obeyed. + // A negative return means we should keep checking things. + + // We do not want this check to apply to RFP, only to FPP + // There is one problematic combination of prefs; however: + // If RFP is enabled in PBMode only and FPP is enabled globally + // (so, in non-PBM mode) - we need to know if we're in PBMode or not. + // But that's kind of expensive and we'd like to avoid it if we + // don't have to, so special-case that scenario + if (StaticPrefs::privacy_fingerprintingProtection_DoNotUseDirectly() && + !StaticPrefs::privacy_resistFingerprinting_DoNotUseDirectly() && + StaticPrefs::privacy_resistFingerprinting_pbmode_DoNotUseDirectly()) { + if (NS_UsePrivateBrowsing(aChannel)) { + // In PBM (where RFP is enabled) do not exempt based on the ETP toggle + return false; + } + } else if (StaticPrefs::privacy_resistFingerprinting_DoNotUseDirectly() || + StaticPrefs:: + privacy_resistFingerprinting_pbmode_DoNotUseDirectly()) { + // In RFP, never use the ETP toggle to exempt. + // We can safely return false here even if we are not in PBM mode + // and RFP_pbmode is enabled because we will later see that and + // return false from the ShouldRFP function entirely. + return false; + } + + nsCOMPtr<nsICookieJarSettings> cookieJarSettings = + GetCookieJarSettings(aLoadInfo); + if (!cookieJarSettings) { + return false; + } + + return ContentBlockingAllowList::Check(cookieJarSettings); +} + +inline bool CookieJarSettingsSaysShouldResistFingerprinting( + nsILoadInfo* aLoadInfo) { + // A positive return from this function should always be obeyed. + // A negative return means we should keep checking things. + + nsCOMPtr<nsICookieJarSettings> cookieJarSettings = + GetCookieJarSettings(aLoadInfo); + if (!cookieJarSettings) { + return false; + } + return cookieJarSettings->GetShouldResistFingerprinting(); +} + +inline bool SchemeSaysShouldNotResistFingerprinting(nsIURI* aURI) { + return aURI->SchemeIs("chrome") || aURI->SchemeIs("resource") || + aURI->SchemeIs("view-source") || aURI->SchemeIs("moz-extension") || + (aURI->SchemeIs("about") && !NS_IsContentAccessibleAboutURI(aURI)); +} + +inline bool SchemeSaysShouldNotResistFingerprinting(nsIPrincipal* aPrincipal) { + if (aPrincipal->SchemeIs("chrome") || aPrincipal->SchemeIs("resource") || + aPrincipal->SchemeIs("view-source") || + aPrincipal->SchemeIs("moz-extension")) { + return true; + } + + if (!aPrincipal->SchemeIs("about")) { + return false; + } + + bool isContentAccessibleAboutURI; + Unused << aPrincipal->IsContentAccessibleAboutURI( + &isContentAccessibleAboutURI); + return !isContentAccessibleAboutURI; +} + +const char* kExemptedDomainsPrefName = + "privacy.resistFingerprinting.exemptedDomains"; + +inline bool PartionKeyIsAlsoExempted( + const mozilla::OriginAttributes& aOriginAttributes) { + // If we've gotten here we have (probably) passed the CookieJarSettings + // check that would tell us that if we _are_ a subdocument, then we are on + // an exempted top-level domain and we should see if we ourselves are + // exempted. But we may have gotten here because we directly called the + // _dangerous function and we haven't done that check, but we _were_ + // instatiated from a state where we could have been partitioned. + // So perform this last-ditch check for that scenario. + // We arbitrarily use https as the scheme, but it doesn't matter. + nsresult rv = NS_ERROR_NOT_INITIALIZED; + nsCOMPtr<nsIURI> uri; + if (StaticPrefs::privacy_firstparty_isolate() && + !aOriginAttributes.mFirstPartyDomain.IsEmpty()) { + rv = NS_NewURI(getter_AddRefs(uri), + u"https://"_ns + aOriginAttributes.mFirstPartyDomain); + } else if (!aOriginAttributes.mPartitionKey.IsEmpty()) { + rv = NS_NewURI(getter_AddRefs(uri), + u"https://"_ns + aOriginAttributes.mPartitionKey); + } + + if (!NS_FAILED(rv)) { + bool isExemptPartitionKey = + nsContentUtils::IsURIInPrefList(uri, kExemptedDomainsPrefName); + if (MOZ_LOG_TEST(nsContentUtils::ResistFingerprintingLog(), + mozilla::LogLevel::Debug)) { + nsAutoCString url; + uri->GetHost(url); + LogDomainAndPrefList("Partition Key", kExemptedDomainsPrefName, url, + isExemptPartitionKey); + } + return isExemptPartitionKey; + } + return true; +} + +// Functions --------------------------------------------------- + +/* static */ +bool nsContentUtils::ShouldResistFingerprinting( + const char* aJustification, RFPTarget aTarget /* = RFPTarget::Unknown */) { + // See comment in header file for information about usage + return ShouldResistFingerprinting(aTarget); +} + +/* static */ +bool nsContentUtils::ShouldResistFingerprinting( + CallerType aCallerType, nsIGlobalObject* aGlobalObject, + RFPTarget aTarget /* = RFPTarget::Unknown */) { + if (aCallerType == CallerType::System) { + return false; + } + return ShouldResistFingerprinting(aGlobalObject, aTarget); +} + +bool nsContentUtils::ShouldResistFingerprinting(nsIDocShell* aDocShell, + RFPTarget aTarget) { + if (!aDocShell) { + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Info, + ("Called nsContentUtils::ShouldResistFingerprinting(nsIDocShell*) " + "with NULL docshell")); + return ShouldResistFingerprinting("Null Object", aTarget); + } + Document* doc = aDocShell->GetDocument(); + if (!doc) { + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Info, + ("Called nsContentUtils::ShouldResistFingerprinting(nsIDocShell*) " + "with NULL doc")); + return ShouldResistFingerprinting(aTarget); + } + return doc->ShouldResistFingerprinting(aTarget); +} + +/* static */ +bool nsContentUtils::ShouldResistFingerprinting( + nsIChannel* aChannel, RFPTarget aTarget /* = RFPTarget::Unknown */) { + if (!aChannel) { + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Info, + ("Called nsContentUtils::ShouldResistFingerprinting(nsIChannel* " + "aChannel) with NULL channel")); + return ShouldResistFingerprinting("Null Object", aTarget); + } + + nsCOMPtr<nsILoadInfo> loadInfo = aChannel->LoadInfo(); + if (!loadInfo) { + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Info, + ("Called nsContentUtils::ShouldResistFingerprinting(nsIChannel* " + "aChannel) but the channel's loadinfo was NULL")); + return ShouldResistFingerprinting("Null Object", aTarget); + } + + // With this check, we can ensure that the prefs and target say yes, so only + // an exemption would cause us to return false. + if (!ShouldResistFingerprinting("Positive return check", aTarget)) { + return false; + } + + if (ETPSaysShouldNotResistFingerprinting(aChannel, loadInfo)) { + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Debug, + ("Inside ShouldResistFingerprinting(nsIChannel*)" + " ETPSaysShouldNotResistFingerprinting said false")); + return false; + } + + if (CookieJarSettingsSaysShouldResistFingerprinting(loadInfo)) { + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Debug, + ("Inside ShouldResistFingerprinting(nsIChannel*)" + " CookieJarSettingsSaysShouldResistFingerprinting said true")); + return true; + } + + // Document types have no loading principal. Subdocument types do have a + // loading principal, but it is the loading principal of the parent + // document; not the subdocument. + auto contentType = loadInfo->GetExternalContentPolicyType(); + // Case 1: Document or Subdocument load + if (contentType == ExtContentPolicy::TYPE_DOCUMENT || + contentType == ExtContentPolicy::TYPE_SUBDOCUMENT) { + nsCOMPtr<nsIURI> channelURI; + nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(channelURI)); + MOZ_ASSERT( + NS_SUCCEEDED(rv), + "Failed to get URI in " + "nsContentUtils::ShouldResistFingerprinting(nsIChannel* aChannel)"); + // this check is to ensure that we do not crash in non-debug builds. + if (NS_FAILED(rv)) { + return true; + } + +#if 0 + if (loadInfo->GetExternalContentPolicyType() == ExtContentPolicy::TYPE_SUBDOCUMENT) { + nsCOMPtr<nsIURI> channelURI; + nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(channelURI)); + nsAutoCString channelSpec; + channelURI->GetSpec(channelSpec); + + if (!loadInfo->GetLoadingPrincipal()) { + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Info, + ("Sub Document Type. FinalChannelURI is %s, Loading Principal is NULL\n", + channelSpec.get())); + + } else { + nsAutoCString loadingPrincipalSpec; + loadInfo->GetLoadingPrincipal()->GetOrigin(loadingPrincipalSpec); + + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Info, + ("Sub Document Type. FinalChannelURI is %s, Loading Principal Origin is %s\n", + channelSpec.get(), loadingPrincipalSpec.get())); + } + } + +#endif + + return ShouldResistFingerprinting_dangerous( + channelURI, loadInfo->GetOriginAttributes(), "Internal Call", aTarget); + } + + // Case 2: Subresource Load + // Because this code is only used for subresource loads, this + // will check the parent's principal + nsIPrincipal* principal = loadInfo->GetLoadingPrincipal(); + + MOZ_ASSERT_IF(principal && !principal->IsSystemPrincipal() && + !principal->GetIsAddonOrExpandedAddonPrincipal(), + BasePrincipal::Cast(principal)->OriginAttributesRef() == + loadInfo->GetOriginAttributes()); + return ShouldResistFingerprinting_dangerous(principal, "Internal Call", + aTarget); +} + +/* static */ +bool nsContentUtils::ShouldResistFingerprinting_dangerous( + nsIURI* aURI, const mozilla::OriginAttributes& aOriginAttributes, + const char* aJustification, RFPTarget aTarget /* = RFPTarget::Unknown */) { + // With this check, we can ensure that the prefs and target say yes, so only + // an exemption would cause us to return false. + if (!ShouldResistFingerprinting("Positive return check", aTarget)) { + return false; + } + + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Debug, + ("Inside ShouldResistFingerprinting_dangerous(nsIURI*," + " OriginAttributes) and the URI is %s", + aURI->GetSpecOrDefault().get())); + + if (!StaticPrefs::privacy_resistFingerprinting_DoNotUseDirectly() && + !StaticPrefs::privacy_fingerprintingProtection_DoNotUseDirectly()) { + // If neither of the 'regular' RFP prefs are set, then one (or both) + // of the PBM-Only prefs are set (or we would have failed the + // Positive return check.) Therefore, if we are not in PBM, return false + if (aOriginAttributes.mPrivateBrowsingId == 0) { + return false; + } + } + + // Exclude internal schemes and web extensions + if (SchemeSaysShouldNotResistFingerprinting(aURI)) { + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Debug, + ("Inside ShouldResistFingerprinting(nsIURI*)" + " SchemeSaysShouldNotResistFingerprinting said false")); + return false; + } + + bool isExemptDomain = false; + nsAutoCString list; + Preferences::GetCString(kExemptedDomainsPrefName, list); + ToLowerCase(list); + isExemptDomain = IsURIInList(aURI, list); + + if (MOZ_LOG_TEST(nsContentUtils::ResistFingerprintingLog(), + mozilla::LogLevel::Debug)) { + nsAutoCString url; + aURI->GetHost(url); + LogDomainAndPrefList("URI", kExemptedDomainsPrefName, url, isExemptDomain); + } + + if (isExemptDomain) { + isExemptDomain &= PartionKeyIsAlsoExempted(aOriginAttributes); + } + + return !isExemptDomain; +} + +/* static */ +bool nsContentUtils::ShouldResistFingerprinting_dangerous( + nsIPrincipal* aPrincipal, const char* aJustification, + RFPTarget aTarget /* = RFPTarget::Unknown */) { + if (!aPrincipal) { + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Info, + ("Called nsContentUtils::ShouldResistFingerprinting(nsILoadInfo* " + "aChannel) but the loadinfo's loadingprincipal was NULL")); + return ShouldResistFingerprinting("Null object", aTarget); + } + + // With this check, we can ensure that the prefs and target say yes, so only + // an exemption would cause us to return false. + if (!ShouldResistFingerprinting("Positive return check", aTarget)) { + return false; + } + + if (aPrincipal->IsSystemPrincipal()) { + return false; + } + + auto originAttributes = + BasePrincipal::Cast(aPrincipal)->OriginAttributesRef(); + if (!StaticPrefs::privacy_resistFingerprinting_DoNotUseDirectly() && + !StaticPrefs::privacy_fingerprintingProtection_DoNotUseDirectly()) { + // If neither of the 'regular' RFP prefs are set, then one (or both) + // of the PBM-Only prefs are set (or we would have failed the + // Positive return check.) Therefore, if we are not in PBM, return false + if (originAttributes.mPrivateBrowsingId == 0) { + return false; + } + } + + // Exclude internal schemes and web extensions + if (SchemeSaysShouldNotResistFingerprinting(aPrincipal)) { + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Debug, + ("Inside ShouldResistFingerprinting(nsIPrincipal*)" + " SchemeSaysShouldNotResistFingerprinting said false")); + return false; + } + + // Web extension principals are also excluded + if (BasePrincipal::Cast(aPrincipal)->AddonPolicy()) { + MOZ_LOG(nsContentUtils::ResistFingerprintingLog(), LogLevel::Debug, + ("Inside ShouldResistFingerprinting_dangerous(nsIPrincipal*)" + " and AddonPolicy said false")); + return false; + } + + bool isExemptDomain = false; + aPrincipal->IsURIInPrefList(kExemptedDomainsPrefName, &isExemptDomain); + + if (MOZ_LOG_TEST(nsContentUtils::ResistFingerprintingLog(), + mozilla::LogLevel::Debug)) { + nsAutoCString origin; + aPrincipal->GetAsciiOrigin(origin); + LogDomainAndPrefList("URI", kExemptedDomainsPrefName, origin, + isExemptDomain); + } + + if (isExemptDomain) { + isExemptDomain &= PartionKeyIsAlsoExempted(originAttributes); + } + + // If we've gotten here we have (probably) passed the CookieJarSettings + // check that would tell us that if we _are_ a subdocument, then we are on + // an exempted top-level domain and we should see if we ourselves are + // exempted. But we may have gotten here because we directly called the + // _dangerous function and we haven't done that check, but we _were_ + // instatiated from a state where we could have been partitioned. + // So perform this last-ditch check for that scenario. + // We arbitrarily use https as the scheme, but it doesn't matter. + nsCOMPtr<nsIURI> uri; + if (isExemptDomain && StaticPrefs::privacy_firstparty_isolate() && + !originAttributes.mFirstPartyDomain.IsEmpty()) { + nsresult rv = + NS_NewURI(getter_AddRefs(uri), + u"https://"_ns + originAttributes.mFirstPartyDomain); + if (!NS_FAILED(rv)) { + isExemptDomain = + nsContentUtils::IsURIInPrefList(uri, kExemptedDomainsPrefName); + } + } else if (isExemptDomain && !originAttributes.mPartitionKey.IsEmpty()) { + nsresult rv = NS_NewURI(getter_AddRefs(uri), + u"https://"_ns + originAttributes.mPartitionKey); + if (!NS_FAILED(rv)) { + isExemptDomain = + nsContentUtils::IsURIInPrefList(uri, kExemptedDomainsPrefName); + } + } + + return !isExemptDomain; +} + +// -------------------------------------------------------------------- + +/* static */ +void nsContentUtils::CalcRoundedWindowSizeForResistingFingerprinting( + int32_t aChromeWidth, int32_t aChromeHeight, int32_t aScreenWidth, + int32_t aScreenHeight, int32_t aInputWidth, int32_t aInputHeight, + bool aSetOuterWidth, bool aSetOuterHeight, int32_t* aOutputWidth, + int32_t* aOutputHeight) { + MOZ_ASSERT(aOutputWidth); + MOZ_ASSERT(aOutputHeight); + + int32_t availContentWidth = 0; + int32_t availContentHeight = 0; + + availContentWidth = std::min(StaticPrefs::privacy_window_maxInnerWidth(), + aScreenWidth - aChromeWidth); +#ifdef MOZ_WIDGET_GTK + // In the GTK window, it will not report outside system decorations + // when we get available window size, see Bug 581863. So, we leave a + // 40 pixels space for them when calculating the available content + // height. It is not necessary for the width since the content width + // is usually pretty much the same as the chrome width. + availContentHeight = std::min(StaticPrefs::privacy_window_maxInnerHeight(), + (-40 + aScreenHeight) - aChromeHeight); +#else + availContentHeight = std::min(StaticPrefs::privacy_window_maxInnerHeight(), + aScreenHeight - aChromeHeight); +#endif + + // Ideally, we'd like to round window size to 1000x1000, but the + // screen space could be too small to accommodate this size in some + // cases. If it happens, we would round the window size to the nearest + // 200x100. + availContentWidth = availContentWidth - (availContentWidth % 200); + availContentHeight = availContentHeight - (availContentHeight % 100); + + // If aIsOuter is true, we are setting the outer window. So we + // have to consider the chrome UI. + int32_t chromeOffsetWidth = aSetOuterWidth ? aChromeWidth : 0; + int32_t chromeOffsetHeight = aSetOuterHeight ? aChromeHeight : 0; + int32_t resultWidth = 0, resultHeight = 0; + + // if the original size is greater than the maximum available size, we set + // it to the maximum size. And if the original value is less than the + // minimum rounded size, we set it to the minimum 200x100. + if (aInputWidth > (availContentWidth + chromeOffsetWidth)) { + resultWidth = availContentWidth + chromeOffsetWidth; + } else if (aInputWidth < (200 + chromeOffsetWidth)) { + resultWidth = 200 + chromeOffsetWidth; + } else { + // Otherwise, we round the window to the nearest upper rounded 200x100. + resultWidth = NSToIntCeil((aInputWidth - chromeOffsetWidth) / 200.0) * 200 + + chromeOffsetWidth; + } + + if (aInputHeight > (availContentHeight + chromeOffsetHeight)) { + resultHeight = availContentHeight + chromeOffsetHeight; + } else if (aInputHeight < (100 + chromeOffsetHeight)) { + resultHeight = 100 + chromeOffsetHeight; + } else { + resultHeight = + NSToIntCeil((aInputHeight - chromeOffsetHeight) / 100.0) * 100 + + chromeOffsetHeight; + } + + *aOutputWidth = resultWidth; + *aOutputHeight = resultHeight; +} + +bool nsContentUtils::ThreadsafeIsCallerChrome() { + return NS_IsMainThread() ? IsCallerChrome() + : IsCurrentThreadRunningChromeWorker(); +} + +bool nsContentUtils::IsCallerUAWidget() { + JSContext* cx = GetCurrentJSContext(); + if (!cx) { + return false; + } + + JS::Realm* realm = JS::GetCurrentRealmOrNull(cx); + if (!realm) { + return false; + } + + return xpc::IsUAWidgetScope(realm); +} + +bool nsContentUtils::IsSystemCaller(JSContext* aCx) { + // Note that SubjectPrincipal() assumes we are in a compartment here. + return SubjectPrincipal(aCx) == sSystemPrincipal; +} + +bool nsContentUtils::ThreadsafeIsSystemCaller(JSContext* aCx) { + CycleCollectedJSContext* ccjscx = CycleCollectedJSContext::Get(); + MOZ_ASSERT(ccjscx->Context() == aCx); + + return ccjscx->IsSystemCaller(); +} + +// static +bool nsContentUtils::LookupBindingMember( + JSContext* aCx, nsIContent* aContent, JS::Handle<jsid> aId, + JS::MutableHandle<JS::PropertyDescriptor> aDesc) { + return true; +} + +nsINode* nsContentUtils::GetNearestInProcessCrossDocParentNode( + nsINode* aChild) { + if (aChild->IsDocument()) { + for (BrowsingContext* bc = aChild->AsDocument()->GetBrowsingContext(); bc; + bc = bc->GetParent()) { + if (bc->GetEmbedderElement()) { + return bc->GetEmbedderElement(); + } + } + return nullptr; + } + + nsINode* parent = aChild->GetParentNode(); + if (parent && parent->IsContent() && aChild->IsContent()) { + parent = aChild->AsContent()->GetFlattenedTreeParent(); + } + + return parent; +} + +bool nsContentUtils::ContentIsHostIncludingDescendantOf( + const nsINode* aPossibleDescendant, const nsINode* aPossibleAncestor) { + MOZ_ASSERT(aPossibleDescendant, "The possible descendant is null!"); + MOZ_ASSERT(aPossibleAncestor, "The possible ancestor is null!"); + + do { + if (aPossibleDescendant == aPossibleAncestor) return true; + if (aPossibleDescendant->IsDocumentFragment()) { + aPossibleDescendant = + aPossibleDescendant->AsDocumentFragment()->GetHost(); + } else { + aPossibleDescendant = aPossibleDescendant->GetParentNode(); + } + } while (aPossibleDescendant); + + return false; +} + +// static +bool nsContentUtils::ContentIsCrossDocDescendantOf(nsINode* aPossibleDescendant, + nsINode* aPossibleAncestor) { + MOZ_ASSERT(aPossibleDescendant, "The possible descendant is null!"); + MOZ_ASSERT(aPossibleAncestor, "The possible ancestor is null!"); + + do { + if (aPossibleDescendant == aPossibleAncestor) { + return true; + } + + aPossibleDescendant = + GetNearestInProcessCrossDocParentNode(aPossibleDescendant); + } while (aPossibleDescendant); + + return false; +} + +// static +bool nsContentUtils::ContentIsFlattenedTreeDescendantOf( + const nsINode* aPossibleDescendant, const nsINode* aPossibleAncestor) { + MOZ_ASSERT(aPossibleDescendant, "The possible descendant is null!"); + MOZ_ASSERT(aPossibleAncestor, "The possible ancestor is null!"); + + do { + if (aPossibleDescendant == aPossibleAncestor) { + return true; + } + aPossibleDescendant = aPossibleDescendant->GetFlattenedTreeParentNode(); + } while (aPossibleDescendant); + + return false; +} + +// static +bool nsContentUtils::ContentIsFlattenedTreeDescendantOfForStyle( + const nsINode* aPossibleDescendant, const nsINode* aPossibleAncestor) { + MOZ_ASSERT(aPossibleDescendant, "The possible descendant is null!"); + MOZ_ASSERT(aPossibleAncestor, "The possible ancestor is null!"); + + do { + if (aPossibleDescendant == aPossibleAncestor) { + return true; + } + aPossibleDescendant = + aPossibleDescendant->GetFlattenedTreeParentNodeForStyle(); + } while (aPossibleDescendant); + + return false; +} + +// static +nsINode* nsContentUtils::Retarget(nsINode* aTargetA, nsINode* aTargetB) { + while (true && aTargetA) { + // If A's root is not a shadow root... + nsINode* root = aTargetA->SubtreeRoot(); + if (!root->IsShadowRoot()) { + // ...then return A. + return aTargetA; + } + + // or A's root is a shadow-including inclusive ancestor of B... + if (aTargetB->IsShadowIncludingInclusiveDescendantOf(root)) { + // ...then return A. + return aTargetA; + } + + aTargetA = ShadowRoot::FromNode(root)->GetHost(); + } + + return nullptr; +} + +// static +Element* nsContentUtils::GetAnElementForTiming(Element* aTarget, + const Document* aDocument, + nsIGlobalObject* aGlobal) { + if (!aTarget->IsInComposedDoc()) { + return nullptr; + } + + if (!aDocument) { + nsCOMPtr<nsPIDOMWindowInner> inner = do_QueryInterface(aGlobal); + if (!inner) { + return nullptr; + } + aDocument = inner->GetExtantDoc(); + } + + MOZ_ASSERT(aDocument); + + if (aTarget->GetUncomposedDocOrConnectedShadowRoot() != aDocument || + !aDocument->IsCurrentActiveDocument()) { + return nullptr; + } + + return aTarget; +} + +// static +nsresult nsContentUtils::GetInclusiveAncestors(nsINode* aNode, + nsTArray<nsINode*>& aArray) { + while (aNode) { + aArray.AppendElement(aNode); + aNode = aNode->GetParentNode(); + } + return NS_OK; +} + +// static +nsresult nsContentUtils::GetInclusiveAncestorsAndOffsets( + nsINode* aNode, uint32_t aOffset, nsTArray<nsIContent*>* aAncestorNodes, + nsTArray<Maybe<uint32_t>>* aAncestorOffsets) { + NS_ENSURE_ARG_POINTER(aNode); + + if (!aNode->IsContent()) { + return NS_ERROR_FAILURE; + } + nsIContent* content = aNode->AsContent(); + + if (!aAncestorNodes->IsEmpty()) { + NS_WARNING("aAncestorNodes is not empty"); + aAncestorNodes->Clear(); + } + + if (!aAncestorOffsets->IsEmpty()) { + NS_WARNING("aAncestorOffsets is not empty"); + aAncestorOffsets->Clear(); + } + + // insert the node itself + aAncestorNodes->AppendElement(content); + aAncestorOffsets->AppendElement(Some(aOffset)); + + // insert all the ancestors + nsIContent* child = content; + nsIContent* parent = child->GetParent(); + while (parent) { + aAncestorNodes->AppendElement(parent); + aAncestorOffsets->AppendElement(parent->ComputeIndexOf(child)); + child = parent; + parent = parent->GetParent(); + } + + return NS_OK; +} + +template <typename Node, typename GetParentFunc> +static Node* GetCommonAncestorInternal(Node* aNode1, Node* aNode2, + GetParentFunc aGetParentFunc) { + MOZ_ASSERT(aNode1 != aNode2); + + // Build the chain of parents + AutoTArray<Node*, 30> parents1, parents2; + do { + parents1.AppendElement(aNode1); + aNode1 = aGetParentFunc(aNode1); + } while (aNode1); + do { + parents2.AppendElement(aNode2); + aNode2 = aGetParentFunc(aNode2); + } while (aNode2); + + // Find where the parent chain differs + uint32_t pos1 = parents1.Length(); + uint32_t pos2 = parents2.Length(); + Node* parent = nullptr; + uint32_t len; + for (len = std::min(pos1, pos2); len > 0; --len) { + Node* child1 = parents1.ElementAt(--pos1); + Node* child2 = parents2.ElementAt(--pos2); + if (child1 != child2) { + break; + } + parent = child1; + } + + return parent; +} + +/* static */ +nsINode* nsContentUtils::GetCommonAncestorHelper(nsINode* aNode1, + nsINode* aNode2) { + return GetCommonAncestorInternal( + aNode1, aNode2, [](nsINode* aNode) { return aNode->GetParentNode(); }); +} + +/* static */ +nsIContent* nsContentUtils::GetCommonFlattenedTreeAncestorHelper( + nsIContent* aContent1, nsIContent* aContent2) { + return GetCommonAncestorInternal( + aContent1, aContent2, + [](nsIContent* aContent) { return aContent->GetFlattenedTreeParent(); }); +} + +/* static */ +Element* nsContentUtils::GetCommonFlattenedTreeAncestorForStyle( + Element* aElement1, Element* aElement2) { + return GetCommonAncestorInternal(aElement1, aElement2, [](Element* aElement) { + return aElement->GetFlattenedTreeParentElementForStyle(); + }); +} + +/* static */ +bool nsContentUtils::PositionIsBefore(nsINode* aNode1, nsINode* aNode2, + Maybe<uint32_t>* aNode1Index, + Maybe<uint32_t>* aNode2Index) { + // Note, CompareDocumentPosition takes the latter params in different order. + return (aNode2->CompareDocumentPosition(*aNode1, aNode2Index, aNode1Index) & + (Node_Binding::DOCUMENT_POSITION_PRECEDING | + Node_Binding::DOCUMENT_POSITION_DISCONNECTED)) == + Node_Binding::DOCUMENT_POSITION_PRECEDING; +} + +/* static */ +Maybe<int32_t> nsContentUtils::ComparePoints( + const nsINode* aParent1, uint32_t aOffset1, const nsINode* aParent2, + uint32_t aOffset2, ComparePointsCache* aParent1Cache) { + bool disconnected{false}; + + const int32_t order = ComparePoints_Deprecated( + aParent1, aOffset1, aParent2, aOffset2, &disconnected, aParent1Cache); + if (disconnected) { + return Nothing(); + } + + return Some(order); +} + +/* static */ +int32_t nsContentUtils::ComparePoints_Deprecated( + const nsINode* aParent1, uint32_t aOffset1, const nsINode* aParent2, + uint32_t aOffset2, bool* aDisconnected, ComparePointsCache* aParent1Cache) { + if (aParent1 == aParent2) { + return aOffset1 < aOffset2 ? -1 : aOffset1 > aOffset2 ? 1 : 0; + } + + AutoTArray<const nsINode*, 32> parents1, parents2; + const nsINode* node1 = aParent1; + const nsINode* node2 = aParent2; + do { + parents1.AppendElement(node1); + node1 = node1->GetParentOrShadowHostNode(); + } while (node1); + do { + parents2.AppendElement(node2); + node2 = node2->GetParentOrShadowHostNode(); + } while (node2); + + uint32_t pos1 = parents1.Length() - 1; + uint32_t pos2 = parents2.Length() - 1; + + bool disconnected = parents1.ElementAt(pos1) != parents2.ElementAt(pos2); + if (aDisconnected) { + *aDisconnected = disconnected; + } + if (disconnected) { + NS_ASSERTION(aDisconnected, "unexpected disconnected nodes"); + return 1; + } + + // Find where the parent chains differ + const nsINode* parent = parents1.ElementAt(pos1); + uint32_t len; + for (len = std::min(pos1, pos2); len > 0; --len) { + const nsINode* child1 = parents1.ElementAt(--pos1); + const nsINode* child2 = parents2.ElementAt(--pos2); + if (child1 != child2) { + if (MOZ_UNLIKELY(child1->IsShadowRoot())) { + // Shadow roots come before light DOM per + // https://dom.spec.whatwg.org/#concept-shadow-including-tree-order + MOZ_ASSERT(!child2->IsShadowRoot(), "Two shadow roots?"); + return -1; + } + if (MOZ_UNLIKELY(child2->IsShadowRoot())) { + return 1; + } + const Maybe<uint32_t> child1Index = + aParent1Cache ? aParent1Cache->ComputeIndexOf(parent, child1) + : parent->ComputeIndexOf(child1); + const Maybe<uint32_t> child2Index = parent->ComputeIndexOf(child2); + if (MOZ_LIKELY(child1Index.isSome() && child2Index.isSome())) { + return *child1Index < *child2Index ? -1 : 1; + } + // XXX Keep the odd traditional behavior for now. + return child1Index.isNothing() && child2Index.isSome() ? -1 : 1; + } + parent = child1; + } + + // The parent chains never differed, so one of the nodes is an ancestor of + // the other + + NS_ASSERTION(!pos1 || !pos2, + "should have run out of parent chain for one of the nodes"); + + if (!pos1) { + const nsINode* child2 = parents2.ElementAt(--pos2); + const Maybe<uint32_t> child2Index = parent->ComputeIndexOf(child2); + if (MOZ_UNLIKELY(NS_WARN_IF(child2Index.isNothing()))) { + return 1; + } + return aOffset1 <= *child2Index ? -1 : 1; + } + + const nsINode* child1 = parents1.ElementAt(--pos1); + const Maybe<uint32_t> child1Index = + aParent1Cache ? aParent1Cache->ComputeIndexOf(parent, child1) + : parent->ComputeIndexOf(child1); + if (MOZ_UNLIKELY(NS_WARN_IF(child1Index.isNothing()))) { + return -1; + } + return *child1Index < aOffset2 ? -1 : 1; +} + +// static +nsINode* nsContentUtils::GetCommonAncestorUnderInteractiveContent( + nsINode* aNode1, nsINode* aNode2) { + if (!aNode1 || !aNode2) { + return nullptr; + } + + if (aNode1 == aNode2) { + return aNode1; + } + + // Build the chain of parents + AutoTArray<nsINode*, 30> parents1; + do { + parents1.AppendElement(aNode1); + if (aNode1->IsElement() && + aNode1->AsElement()->IsInteractiveHTMLContent()) { + break; + } + aNode1 = aNode1->GetFlattenedTreeParentNode(); + } while (aNode1); + + AutoTArray<nsINode*, 30> parents2; + do { + parents2.AppendElement(aNode2); + if (aNode2->IsElement() && + aNode2->AsElement()->IsInteractiveHTMLContent()) { + break; + } + aNode2 = aNode2->GetFlattenedTreeParentNode(); + } while (aNode2); + + // Find where the parent chain differs + uint32_t pos1 = parents1.Length(); + uint32_t pos2 = parents2.Length(); + nsINode* parent = nullptr; + for (uint32_t len = std::min(pos1, pos2); len > 0; --len) { + nsINode* child1 = parents1.ElementAt(--pos1); + nsINode* child2 = parents2.ElementAt(--pos2); + if (child1 != child2) { + break; + } + parent = child1; + } + + return parent; +} + +/* static */ +BrowserParent* nsContentUtils::GetCommonBrowserParentAncestor( + BrowserParent* aBrowserParent1, BrowserParent* aBrowserParent2) { + return GetCommonAncestorInternal( + aBrowserParent1, aBrowserParent2, [](BrowserParent* aBrowserParent) { + return aBrowserParent->GetBrowserBridgeParent() + ? aBrowserParent->GetBrowserBridgeParent()->Manager() + : nullptr; + }); +} + +/* static */ +Element* nsContentUtils::GetTargetElement(Document* aDocument, + const nsAString& aAnchorName) { + MOZ_ASSERT(aDocument); + + if (aAnchorName.IsEmpty()) { + return nullptr; + } + // 1. If there is an element in the document tree that has an ID equal to + // fragment, then return the first such element in tree order. + if (Element* el = aDocument->GetElementById(aAnchorName)) { + return el; + } + + // 2. If there is an a element in the document tree that has a name + // attribute whose value is equal to fragment, then return the first such + // element in tree order. + // + // FIXME(emilio): Why the different code-paths for HTML and non-HTML docs? + if (aDocument->IsHTMLDocument()) { + nsCOMPtr<nsINodeList> list = aDocument->GetElementsByName(aAnchorName); + // Loop through the named nodes looking for the first anchor + uint32_t length = list->Length(); + for (uint32_t i = 0; i < length; i++) { + nsIContent* node = list->Item(i); + if (node->IsHTMLElement(nsGkAtoms::a)) { + return node->AsElement(); + } + } + } else { + constexpr auto nameSpace = u"http://www.w3.org/1999/xhtml"_ns; + // Get the list of anchor elements + nsCOMPtr<nsINodeList> list = + aDocument->GetElementsByTagNameNS(nameSpace, u"a"_ns); + // Loop through the anchors looking for the first one with the given name. + for (uint32_t i = 0; true; i++) { + nsIContent* node = list->Item(i); + if (!node) { // End of list + break; + } + + // Compare the name attribute + if (node->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::name, + aAnchorName, eCaseMatters)) { + return node->AsElement(); + } + } + } + + // 3. Return null. + return nullptr; +} + +/* static */ +template <typename FPT, typename FRT, typename SPT, typename SRT> +Maybe<int32_t> nsContentUtils::ComparePoints( + const RangeBoundaryBase<FPT, FRT>& aFirstBoundary, + const RangeBoundaryBase<SPT, SRT>& aSecondBoundary) { + if (!aFirstBoundary.IsSet() || !aSecondBoundary.IsSet()) { + return Nothing{}; + } + + bool disconnected{false}; + const int32_t order = + ComparePoints_Deprecated(aFirstBoundary, aSecondBoundary, &disconnected); + + if (disconnected) { + return Nothing{}; + } + + return Some(order); +} + +/* static */ +template <typename FPT, typename FRT, typename SPT, typename SRT> +int32_t nsContentUtils::ComparePoints_Deprecated( + const RangeBoundaryBase<FPT, FRT>& aFirstBoundary, + const RangeBoundaryBase<SPT, SRT>& aSecondBoundary, bool* aDisconnected) { + if (NS_WARN_IF(!aFirstBoundary.IsSet()) || + NS_WARN_IF(!aSecondBoundary.IsSet())) { + return -1; + } + // XXX Re-implement this without calling `Offset()` as far as possible, + // and the other overload should be an alias of this. + return ComparePoints_Deprecated( + aFirstBoundary.Container(), + *aFirstBoundary.Offset( + RangeBoundaryBase<FPT, FRT>::OffsetFilter::kValidOrInvalidOffsets), + aSecondBoundary.Container(), + *aSecondBoundary.Offset( + RangeBoundaryBase<SPT, SRT>::OffsetFilter::kValidOrInvalidOffsets), + aDisconnected); +} + +inline bool IsCharInSet(const char* aSet, const char16_t aChar) { + char16_t ch; + while ((ch = *aSet)) { + if (aChar == char16_t(ch)) { + return true; + } + ++aSet; + } + return false; +} + +/** + * This method strips leading/trailing chars, in given set, from string. + */ + +// static +const nsDependentSubstring nsContentUtils::TrimCharsInSet( + const char* aSet, const nsAString& aValue) { + nsAString::const_iterator valueCurrent, valueEnd; + + aValue.BeginReading(valueCurrent); + aValue.EndReading(valueEnd); + + // Skip characters in the beginning + while (valueCurrent != valueEnd) { + if (!IsCharInSet(aSet, *valueCurrent)) { + break; + } + ++valueCurrent; + } + + if (valueCurrent != valueEnd) { + for (;;) { + --valueEnd; + if (!IsCharInSet(aSet, *valueEnd)) { + break; + } + } + ++valueEnd; // Step beyond the last character we want in the value. + } + + // valueEnd should point to the char after the last to copy + return Substring(valueCurrent, valueEnd); +} + +/** + * This method strips leading and trailing whitespace from a string. + */ + +// static +template <bool IsWhitespace(char16_t)> +const nsDependentSubstring nsContentUtils::TrimWhitespace(const nsAString& aStr, + bool aTrimTrailing) { + nsAString::const_iterator start, end; + + aStr.BeginReading(start); + aStr.EndReading(end); + + // Skip whitespace characters in the beginning + while (start != end && IsWhitespace(*start)) { + ++start; + } + + if (aTrimTrailing) { + // Skip whitespace characters in the end. + while (end != start) { + --end; + + if (!IsWhitespace(*end)) { + // Step back to the last non-whitespace character. + ++end; + + break; + } + } + } + + // Return a substring for the string w/o leading and/or trailing + // whitespace + + return Substring(start, end); +} + +// Declaring the templates we are going to use avoid linking issues without +// inlining the method. Considering there is not so much spaces checking +// methods we can consider this to be better than inlining. +template const nsDependentSubstring +nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(const nsAString&, bool); +template const nsDependentSubstring nsContentUtils::TrimWhitespace< + nsContentUtils::IsHTMLWhitespace>(const nsAString&, bool); +template const nsDependentSubstring nsContentUtils::TrimWhitespace< + nsContentUtils::IsHTMLWhitespaceOrNBSP>(const nsAString&, bool); + +static inline void KeyAppendSep(nsACString& aKey) { + if (!aKey.IsEmpty()) { + aKey.Append('>'); + } +} + +static inline void KeyAppendString(const nsAString& aString, nsACString& aKey) { + KeyAppendSep(aKey); + + // Could escape separator here if collisions happen. > is not a legal char + // for a name or type attribute, so we should be safe avoiding that extra + // work. + + AppendUTF16toUTF8(aString, aKey); +} + +static inline void KeyAppendString(const nsACString& aString, + nsACString& aKey) { + KeyAppendSep(aKey); + + // Could escape separator here if collisions happen. > is not a legal char + // for a name or type attribute, so we should be safe avoiding that extra + // work. + + aKey.Append(aString); +} + +static inline void KeyAppendInt(int32_t aInt, nsACString& aKey) { + KeyAppendSep(aKey); + + aKey.AppendInt(aInt); +} + +static inline bool IsAutocompleteOff(const nsIContent* aContent) { + return aContent->IsElement() && + aContent->AsElement()->AttrValueIs(kNameSpaceID_None, + nsGkAtoms::autocomplete, u"off"_ns, + eIgnoreCase); +} + +/*static*/ +void nsContentUtils::GenerateStateKey(nsIContent* aContent, Document* aDocument, + nsACString& aKey) { + MOZ_ASSERT(aContent); + + aKey.Truncate(); + + uint32_t partID = aDocument ? aDocument->GetPartID() : 0; + + // Don't capture state for anonymous content + if (aContent->IsInNativeAnonymousSubtree()) { + return; + } + + if (IsAutocompleteOff(aContent)) { + return; + } + + RefPtr<Document> doc = aContent->GetUncomposedDoc(); + + KeyAppendInt(partID, aKey); // first append a partID + bool generatedUniqueKey = false; + + if (doc && doc->IsHTMLOrXHTML()) { + nsHTMLDocument* htmlDoc = doc->AsHTMLDocument(); + + // If we have a form control and can calculate form information, use that + // as the key - it is more reliable than just recording position in the + // DOM. + // XXXbz Is it, really? We have bugs on this, I think... + // Important to have a unique key, and tag/type/name may not be. + // + // The format of the key depends on whether the control has a form, + // and whether the element was parser inserted: + // + // [Has Form, Parser Inserted]: + // fp>type>FormNum>IndOfControlInForm>FormName>name + // + // [No Form, Parser Inserted]: + // dp>type>ControlNum>name + // + // [Has Form, Not Parser Inserted]: + // fn>type>IndOfFormInDoc>IndOfControlInForm>FormName>name + // + // [No Form, Not Parser Inserted]: + // dn>type>IndOfControlInDoc>name + // + // XXX We don't need to use index if name is there + // XXXbz We don't? Why not? I don't follow. + // + nsCOMPtr<nsIFormControl> control(do_QueryInterface(aContent)); + if (control) { + // Get the control number if this was a parser inserted element from the + // network. + int32_t controlNumber = + control->GetParserInsertedControlNumberForStateKey(); + bool parserInserted = controlNumber != -1; + + RefPtr<nsContentList> htmlForms; + RefPtr<nsContentList> htmlFormControls; + if (!parserInserted) { + // Getting these lists is expensive, as we need to keep them up to date + // as the document loads, so we avoid it if we don't need them. + htmlDoc->GetFormsAndFormControls(getter_AddRefs(htmlForms), + getter_AddRefs(htmlFormControls)); + } + + // Append the control type + KeyAppendInt(int32_t(control->ControlType()), aKey); + + // If in a form, add form name / index of form / index in form + HTMLFormElement* formElement = control->GetForm(); + if (formElement) { + if (IsAutocompleteOff(formElement)) { + aKey.Truncate(); + return; + } + + // Append the form number, if this is a parser inserted control, or + // the index of the form in the document otherwise. + bool appendedForm = false; + if (parserInserted) { + MOZ_ASSERT(formElement->GetFormNumberForStateKey() != -1, + "when generating a state key for a parser inserted form " + "control we should have a parser inserted <form> element"); + KeyAppendString("fp"_ns, aKey); + KeyAppendInt(formElement->GetFormNumberForStateKey(), aKey); + appendedForm = true; + } else { + KeyAppendString("fn"_ns, aKey); + int32_t index = htmlForms->IndexOf(formElement, false); + if (index <= -1) { + // + // XXX HACK this uses some state that was dumped into the document + // specifically to fix bug 138892. What we are trying to do is + // *guess* which form this control's state is found in, with the + // highly likely guess that the highest form parsed so far is the + // one. This code should not be on trunk, only branch. + // + index = htmlDoc->GetNumFormsSynchronous() - 1; + } + if (index > -1) { + KeyAppendInt(index, aKey); + appendedForm = true; + } + } + + if (appendedForm) { + // Append the index of the control in the form + int32_t index = formElement->IndexOfContent(aContent); + + if (index > -1) { + KeyAppendInt(index, aKey); + generatedUniqueKey = true; + } + } + + // Append the form name + nsAutoString formName; + formElement->GetAttr(kNameSpaceID_None, nsGkAtoms::name, formName); + KeyAppendString(formName, aKey); + } else { + // Not in a form. Append the control number, if this is a parser + // inserted control, or the index of the control in the document + // otherwise. + if (parserInserted) { + KeyAppendString("dp"_ns, aKey); + KeyAppendInt(control->GetParserInsertedControlNumberForStateKey(), + aKey); + generatedUniqueKey = true; + } else { + KeyAppendString("dn"_ns, aKey); + int32_t index = htmlFormControls->IndexOf(aContent, true); + if (index > -1) { + KeyAppendInt(index, aKey); + generatedUniqueKey = true; + } + } + + // Append the control name + nsAutoString name; + aContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::name, + name); + KeyAppendString(name, aKey); + } + } + } + + if (!generatedUniqueKey) { + // Either we didn't have a form control or we aren't in an HTML document so + // we can't figure out form info. Append the tag name if it's an element + // to avoid restoring state for one type of element on another type. + if (aContent->IsElement()) { + KeyAppendString(nsDependentAtomString(aContent->NodeInfo()->NameAtom()), + aKey); + } else { + // Append a character that is not "d" or "f" to disambiguate from + // the case when we were a form control in an HTML document. + KeyAppendString("o"_ns, aKey); + } + + // Now start at aContent and append the indices of it and all its ancestors + // in their containers. That should at least pin down its position in the + // DOM... + nsINode* parent = aContent->GetParentNode(); + nsINode* content = aContent; + while (parent) { + KeyAppendInt(parent->ComputeIndexOf_Deprecated(content), aKey); + content = parent; + parent = content->GetParentNode(); + } + } +} + +// static +nsIPrincipal* nsContentUtils::SubjectPrincipal(JSContext* aCx) { + MOZ_ASSERT(NS_IsMainThread()); + + // As opposed to SubjectPrincipal(), we do in fact assume that + // we're in a realm here; anyone who calls this function in + // situations where that's not the case is doing it wrong. + JS::Realm* realm = js::GetContextRealm(aCx); + MOZ_ASSERT(realm); + + JSPrincipals* principals = JS::GetRealmPrincipals(realm); + return nsJSPrincipals::get(principals); +} + +// static +nsIPrincipal* nsContentUtils::SubjectPrincipal() { + MOZ_ASSERT(IsInitialized()); + MOZ_ASSERT(NS_IsMainThread()); + JSContext* cx = GetCurrentJSContext(); + if (!cx) { + MOZ_CRASH( + "Accessing the Subject Principal without an AutoJSAPI on the stack is " + "forbidden"); + } + + JS::Realm* realm = js::GetContextRealm(cx); + + // When an AutoJSAPI is instantiated, we are in a null realm until the + // first JSAutoRealm, which is kind of a purgatory as far as permissions + // go. It would be nice to just hard-abort if somebody does a security check + // in this purgatory zone, but that would be too fragile, since it could be + // triggered by random IsCallerChrome() checks 20-levels deep. + // + // So we want to return _something_ here - and definitely not the System + // Principal, since that would make an AutoJSAPI a very dangerous thing to + // instantiate. + // + // The natural thing to return is a null principal. Ideally, we'd return a + // different null principal each time, to avoid any unexpected interactions + // when the principal accidentally gets inherited somewhere. But + // SubjectPrincipal doesn't return strong references, so there's no way to + // sanely manage the lifetime of multiple null principals. + // + // So we use a singleton null principal. To avoid it being accidentally + // inherited and becoming a "real" subject or object principal, we do a + // release-mode assert during realm creation against using this principal on + // an actual global. + if (!realm) { + return sNullSubjectPrincipal; + } + + return SubjectPrincipal(cx); +} + +// static +nsIPrincipal* nsContentUtils::ObjectPrincipal(JSObject* aObj) { +#ifdef DEBUG + JS::AssertObjectBelongsToCurrentThread(aObj); +#endif + + MOZ_DIAGNOSTIC_ASSERT(!js::IsCrossCompartmentWrapper(aObj)); + + JS::Realm* realm = js::GetNonCCWObjectRealm(aObj); + JSPrincipals* principals = JS::GetRealmPrincipals(realm); + return nsJSPrincipals::get(principals); +} + +// static +nsresult nsContentUtils::NewURIWithDocumentCharset(nsIURI** aResult, + const nsAString& aSpec, + Document* aDocument, + nsIURI* aBaseURI) { + if (aDocument) { + return NS_NewURI(aResult, aSpec, aDocument->GetDocumentCharacterSet(), + aBaseURI); + } + return NS_NewURI(aResult, aSpec, nullptr, aBaseURI); +} + +// static +bool nsContentUtils::IsNameWithDash(nsAtom* aName) { + // A valid custom element name is a sequence of characters name which + // must match the PotentialCustomElementName production: + // PotentialCustomElementName ::= [a-z] (PCENChar)* '-' (PCENChar)* + const char16_t* name = aName->GetUTF16String(); + uint32_t len = aName->GetLength(); + bool hasDash = false; + + if (!len || name[0] < 'a' || name[0] > 'z') { + return false; + } + + uint32_t i = 1; + while (i < len) { + if (i + 1 < len && NS_IS_SURROGATE_PAIR(name[i], name[i + 1])) { + // Merged two 16-bit surrogate pairs into code point. + char32_t code = SURROGATE_TO_UCS4(name[i], name[i + 1]); + + if (code < 0x10000 || code > 0xEFFFF) { + return false; + } + + i += 2; + } else { + if (name[i] == '-') { + hasDash = true; + } + + if (name[i] != '-' && name[i] != '.' && name[i] != '_' && + name[i] != 0xB7 && (name[i] < '0' || name[i] > '9') && + (name[i] < 'a' || name[i] > 'z') && + (name[i] < 0xC0 || name[i] > 0xD6) && + (name[i] < 0xF8 || name[i] > 0x37D) && + (name[i] < 0x37F || name[i] > 0x1FFF) && + (name[i] < 0x200C || name[i] > 0x200D) && + (name[i] < 0x203F || name[i] > 0x2040) && + (name[i] < 0x2070 || name[i] > 0x218F) && + (name[i] < 0x2C00 || name[i] > 0x2FEF) && + (name[i] < 0x3001 || name[i] > 0xD7FF) && + (name[i] < 0xF900 || name[i] > 0xFDCF) && + (name[i] < 0xFDF0 || name[i] > 0xFFFD)) { + return false; + } + + i++; + } + } + + return hasDash; +} + +// static +bool nsContentUtils::IsCustomElementName(nsAtom* aName, uint32_t aNameSpaceID) { + // Allow non-dashed names in XUL for XBL to Custom Element migrations. + if (aNameSpaceID == kNameSpaceID_XUL) { + return true; + } + + bool hasDash = IsNameWithDash(aName); + if (!hasDash) { + return false; + } + + // The custom element name must not be one of the following values: + // annotation-xml + // color-profile + // font-face + // font-face-src + // font-face-uri + // font-face-format + // font-face-name + // missing-glyph + return aName != nsGkAtoms::annotation_xml_ && + aName != nsGkAtoms::colorProfile && aName != nsGkAtoms::font_face && + aName != nsGkAtoms::font_face_src && + aName != nsGkAtoms::font_face_uri && + aName != nsGkAtoms::font_face_format && + aName != nsGkAtoms::font_face_name && aName != nsGkAtoms::missingGlyph; +} + +// static +nsresult nsContentUtils::CheckQName(const nsAString& aQualifiedName, + bool aNamespaceAware, + const char16_t** aColon) { + const char* colon = nullptr; + const char16_t* begin = aQualifiedName.BeginReading(); + const char16_t* end = aQualifiedName.EndReading(); + + int result = MOZ_XMLCheckQName(reinterpret_cast<const char*>(begin), + reinterpret_cast<const char*>(end), + aNamespaceAware, &colon); + + if (!result) { + if (aColon) { + *aColon = reinterpret_cast<const char16_t*>(colon); + } + + return NS_OK; + } + + return NS_ERROR_DOM_INVALID_CHARACTER_ERR; +} + +// static +nsresult nsContentUtils::SplitQName(const nsIContent* aNamespaceResolver, + const nsString& aQName, int32_t* aNamespace, + nsAtom** aLocalName) { + const char16_t* colon; + nsresult rv = nsContentUtils::CheckQName(aQName, true, &colon); + NS_ENSURE_SUCCESS(rv, rv); + + if (colon) { + const char16_t* end; + aQName.EndReading(end); + nsAutoString nameSpace; + rv = aNamespaceResolver->LookupNamespaceURIInternal( + Substring(aQName.get(), colon), nameSpace); + NS_ENSURE_SUCCESS(rv, rv); + + *aNamespace = nsNameSpaceManager::GetInstance()->GetNameSpaceID( + nameSpace, nsContentUtils::IsChromeDoc(aNamespaceResolver->OwnerDoc())); + if (*aNamespace == kNameSpaceID_Unknown) return NS_ERROR_FAILURE; + + *aLocalName = NS_AtomizeMainThread(Substring(colon + 1, end)).take(); + } else { + *aNamespace = kNameSpaceID_None; + *aLocalName = NS_AtomizeMainThread(aQName).take(); + } + NS_ENSURE_TRUE(aLocalName, NS_ERROR_OUT_OF_MEMORY); + return NS_OK; +} + +// static +nsresult nsContentUtils::GetNodeInfoFromQName( + const nsAString& aNamespaceURI, const nsAString& aQualifiedName, + nsNodeInfoManager* aNodeInfoManager, uint16_t aNodeType, + mozilla::dom::NodeInfo** aNodeInfo) { + const nsString& qName = PromiseFlatString(aQualifiedName); + const char16_t* colon; + nsresult rv = nsContentUtils::CheckQName(qName, true, &colon); + NS_ENSURE_SUCCESS(rv, rv); + + int32_t nsID; + nsNameSpaceManager::GetInstance()->RegisterNameSpace(aNamespaceURI, nsID); + if (colon) { + const char16_t* end; + qName.EndReading(end); + + RefPtr<nsAtom> prefix = NS_AtomizeMainThread(Substring(qName.get(), colon)); + + rv = aNodeInfoManager->GetNodeInfo(Substring(colon + 1, end), prefix, nsID, + aNodeType, aNodeInfo); + } else { + rv = aNodeInfoManager->GetNodeInfo(aQualifiedName, nullptr, nsID, aNodeType, + aNodeInfo); + } + NS_ENSURE_SUCCESS(rv, rv); + + return nsContentUtils::IsValidNodeName((*aNodeInfo)->NameAtom(), + (*aNodeInfo)->GetPrefixAtom(), + (*aNodeInfo)->NamespaceID()) + ? NS_OK + : NS_ERROR_DOM_NAMESPACE_ERR; +} + +// static +void nsContentUtils::SplitExpatName(const char16_t* aExpatName, + nsAtom** aPrefix, nsAtom** aLocalName, + int32_t* aNameSpaceID) { + /** + * Expat can send the following: + * localName + * namespaceURI<separator>localName + * namespaceURI<separator>localName<separator>prefix + * + * and we use 0xFFFF for the <separator>. + * + */ + + const char16_t* uriEnd = nullptr; + const char16_t* nameEnd = nullptr; + const char16_t* pos; + for (pos = aExpatName; *pos; ++pos) { + if (*pos == 0xFFFF) { + if (uriEnd) { + nameEnd = pos; + } else { + uriEnd = pos; + } + } + } + + const char16_t* nameStart; + if (uriEnd) { + nsNameSpaceManager::GetInstance()->RegisterNameSpace( + nsDependentSubstring(aExpatName, uriEnd), *aNameSpaceID); + + nameStart = (uriEnd + 1); + if (nameEnd) { + const char16_t* prefixStart = nameEnd + 1; + *aPrefix = NS_AtomizeMainThread(Substring(prefixStart, pos)).take(); + } else { + nameEnd = pos; + *aPrefix = nullptr; + } + } else { + *aNameSpaceID = kNameSpaceID_None; + nameStart = aExpatName; + nameEnd = pos; + *aPrefix = nullptr; + } + *aLocalName = NS_AtomizeMainThread(Substring(nameStart, nameEnd)).take(); +} + +// static +PresShell* nsContentUtils::GetPresShellForContent(const nsIContent* aContent) { + Document* doc = aContent->GetComposedDoc(); + if (!doc) { + return nullptr; + } + return doc->GetPresShell(); +} + +// static +nsPresContext* nsContentUtils::GetContextForContent( + const nsIContent* aContent) { + PresShell* presShell = GetPresShellForContent(aContent); + if (!presShell) { + return nullptr; + } + return presShell->GetPresContext(); +} + +// static +bool nsContentUtils::CanLoadImage(nsIURI* aURI, nsINode* aNode, + Document* aLoadingDocument, + nsIPrincipal* aLoadingPrincipal) { + MOZ_ASSERT(aURI, "Must have a URI"); + MOZ_ASSERT(aLoadingDocument, "Must have a document"); + MOZ_ASSERT(aLoadingPrincipal, "Must have a loading principal"); + + nsresult rv; + + auto appType = nsIDocShell::APP_TYPE_UNKNOWN; + + { + nsCOMPtr<nsIDocShellTreeItem> docShellTreeItem = + aLoadingDocument->GetDocShell(); + if (docShellTreeItem) { + nsCOMPtr<nsIDocShellTreeItem> root; + docShellTreeItem->GetInProcessRootTreeItem(getter_AddRefs(root)); + + nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(root)); + + if (docShell) { + appType = docShell->GetAppType(); + } + } + } + + if (appType != nsIDocShell::APP_TYPE_EDITOR) { + // Editor apps get special treatment here, editors can load images + // from anywhere. This allows editor to insert images from file:// + // into documents that are being edited. + rv = sSecurityManager->CheckLoadURIWithPrincipal( + aLoadingPrincipal, aURI, nsIScriptSecurityManager::ALLOW_CHROME, + aLoadingDocument->InnerWindowID()); + if (NS_FAILED(rv)) { + return false; + } + } + + nsCOMPtr<nsILoadInfo> secCheckLoadInfo = new mozilla::net::LoadInfo( + aLoadingPrincipal, + aLoadingPrincipal, // triggering principal + aNode, nsILoadInfo::SEC_ONLY_FOR_EXPLICIT_CONTENTSEC_CHECK, + nsIContentPolicy::TYPE_INTERNAL_IMAGE); + + int16_t decision = nsIContentPolicy::ACCEPT; + + rv = NS_CheckContentLoadPolicy(aURI, secCheckLoadInfo, + ""_ns, // mime guess + &decision, GetContentPolicy()); + + return NS_SUCCEEDED(rv) && NS_CP_ACCEPTED(decision); +} + +// static +bool nsContentUtils::IsInPrivateBrowsing(Document* aDoc) { + if (!aDoc) { + return false; + } + + nsCOMPtr<nsILoadGroup> loadGroup = aDoc->GetDocumentLoadGroup(); + if (loadGroup) { + nsCOMPtr<nsIInterfaceRequestor> callbacks; + loadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks)); + if (callbacks) { + nsCOMPtr<nsILoadContext> loadContext = do_GetInterface(callbacks); + if (loadContext) { + return loadContext->UsePrivateBrowsing(); + } + } + } + + nsCOMPtr<nsIChannel> channel = aDoc->GetChannel(); + return channel && NS_UsePrivateBrowsing(channel); +} + +// static +bool nsContentUtils::IsInPrivateBrowsing(nsILoadGroup* aLoadGroup) { + if (!aLoadGroup) { + return false; + } + bool isPrivate = false; + nsCOMPtr<nsIInterfaceRequestor> callbacks; + aLoadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks)); + if (callbacks) { + nsCOMPtr<nsILoadContext> loadContext = do_GetInterface(callbacks); + isPrivate = loadContext && loadContext->UsePrivateBrowsing(); + } + return isPrivate; +} + +// FIXME(emilio): This is (effectively) almost but not quite the same as +// Document::ShouldLoadImages(), which one is right? +bool nsContentUtils::DocumentInactiveForImageLoads(Document* aDocument) { + if (!aDocument) { + return false; + } + if (IsChromeDoc(aDocument) || aDocument->IsResourceDoc() || + aDocument->IsStaticDocument()) { + return false; + } + nsCOMPtr<nsPIDOMWindowInner> win = + do_QueryInterface(aDocument->GetScopeObject()); + return !win || !win->GetDocShell(); +} + +imgLoader* nsContentUtils::GetImgLoaderForDocument(Document* aDoc) { + NS_ENSURE_TRUE(!DocumentInactiveForImageLoads(aDoc), nullptr); + + if (!aDoc) { + return imgLoader::NormalLoader(); + } + bool isPrivate = IsInPrivateBrowsing(aDoc); + return isPrivate ? imgLoader::PrivateBrowsingLoader() + : imgLoader::NormalLoader(); +} + +// static +imgLoader* nsContentUtils::GetImgLoaderForChannel(nsIChannel* aChannel, + Document* aContext) { + NS_ENSURE_TRUE(!DocumentInactiveForImageLoads(aContext), nullptr); + + if (!aChannel) { + return imgLoader::NormalLoader(); + } + nsCOMPtr<nsILoadContext> context; + NS_QueryNotificationCallbacks(aChannel, context); + return context && context->UsePrivateBrowsing() + ? imgLoader::PrivateBrowsingLoader() + : imgLoader::NormalLoader(); +} + +// static +int32_t nsContentUtils::CORSModeToLoadImageFlags(mozilla::CORSMode aMode) { + switch (aMode) { + case CORS_ANONYMOUS: + return imgILoader::LOAD_CORS_ANONYMOUS; + case CORS_USE_CREDENTIALS: + return imgILoader::LOAD_CORS_USE_CREDENTIALS; + default: + return 0; + } +} + +// static +nsresult nsContentUtils::LoadImage( + nsIURI* aURI, nsINode* aContext, Document* aLoadingDocument, + nsIPrincipal* aLoadingPrincipal, uint64_t aRequestContextID, + nsIReferrerInfo* aReferrerInfo, imgINotificationObserver* aObserver, + int32_t aLoadFlags, const nsAString& initiatorType, + imgRequestProxy** aRequest, nsContentPolicyType aContentPolicyType, + bool aUseUrgentStartForChannel, bool aLinkPreload, + uint64_t aEarlyHintPreloaderId) { + MOZ_ASSERT(aURI, "Must have a URI"); + MOZ_ASSERT(aContext, "Must have a context"); + MOZ_ASSERT(aLoadingDocument, "Must have a document"); + MOZ_ASSERT(aLoadingPrincipal, "Must have a principal"); + MOZ_ASSERT(aRequest, "Null out param"); + + imgLoader* imgLoader = GetImgLoaderForDocument(aLoadingDocument); + if (!imgLoader) { + // nothing we can do here + return NS_ERROR_FAILURE; + } + + nsCOMPtr<nsILoadGroup> loadGroup = aLoadingDocument->GetDocumentLoadGroup(); + + nsIURI* documentURI = aLoadingDocument->GetDocumentURI(); + + NS_ASSERTION(loadGroup || aLoadingDocument->IsSVGGlyphsDocument(), + "Could not get loadgroup; onload may fire too early"); + + // XXXbz using "documentURI" for the initialDocumentURI is not quite + // right, but the best we can do here... + return imgLoader->LoadImage(aURI, /* uri to load */ + documentURI, /* initialDocumentURI */ + aReferrerInfo, /* referrerInfo */ + aLoadingPrincipal, /* loading principal */ + aRequestContextID, /* request context ID */ + loadGroup, /* loadgroup */ + aObserver, /* imgINotificationObserver */ + aContext, /* loading context */ + aLoadingDocument, /* uniquification key */ + aLoadFlags, /* load flags */ + nullptr, /* cache key */ + aContentPolicyType, /* content policy type */ + initiatorType, /* the load initiator */ + aUseUrgentStartForChannel, /* urgent-start flag */ + aLinkPreload, /* <link preload> initiator */ + aEarlyHintPreloaderId, aRequest); +} + +// static +already_AddRefed<imgIContainer> nsContentUtils::GetImageFromContent( + nsIImageLoadingContent* aContent, imgIRequest** aRequest) { + if (aRequest) { + *aRequest = nullptr; + } + + NS_ENSURE_TRUE(aContent, nullptr); + + nsCOMPtr<imgIRequest> imgRequest; + aContent->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST, + getter_AddRefs(imgRequest)); + if (!imgRequest) { + return nullptr; + } + + nsCOMPtr<imgIContainer> imgContainer; + imgRequest->GetImage(getter_AddRefs(imgContainer)); + + if (!imgContainer) { + return nullptr; + } + + if (aRequest) { + // If the consumer wants the request, verify it has actually loaded + // successfully. + uint32_t imgStatus; + imgRequest->GetImageStatus(&imgStatus); + if (imgStatus & imgIRequest::STATUS_FRAME_COMPLETE && + !(imgStatus & imgIRequest::STATUS_ERROR)) { + imgRequest.swap(*aRequest); + } + } + + return imgContainer.forget(); +} + +static bool IsLinkWithURI(const nsIContent& aContent) { + const auto* element = Element::FromNode(aContent); + if (!element || !element->IsLink()) { + return false; + } + nsCOMPtr<nsIURI> absURI = element->GetHrefURI(); + return !!absURI; +} + +static bool HasImageRequest(nsIContent& aContent) { + nsCOMPtr<nsIImageLoadingContent> imageContent(do_QueryInterface(&aContent)); + if (!imageContent) { + return false; + } + + nsCOMPtr<imgIRequest> imgRequest; + imageContent->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST, + getter_AddRefs(imgRequest)); + + // XXXbz It may be draggable even if the request resulted in an error. Why? + // Not sure; that's what the old nsContentAreaDragDrop/nsFrame code did. + return !!imgRequest; +} + +static Maybe<bool> DraggableOverride(const nsIContent& aContent) { + if (auto* el = nsGenericHTMLElement::FromNode(aContent)) { + if (el->Draggable()) { + return Some(true); + } + + if (el->AttrValueIs(kNameSpaceID_None, nsGkAtoms::draggable, + nsGkAtoms::_false, eIgnoreCase)) { + return Some(false); + } + } + if (aContent.IsSVGElement()) { + return Some(false); + } + return Nothing(); +} + +// static +bool nsContentUtils::ContentIsDraggable(nsIContent* aContent) { + MOZ_ASSERT(aContent); + + if (auto draggable = DraggableOverride(*aContent)) { + return *draggable; + } + + // special handling for content area image and link dragging + return HasImageRequest(*aContent) || IsLinkWithURI(*aContent); +} + +// static +bool nsContentUtils::IsDraggableImage(nsIContent* aContent) { + MOZ_ASSERT(aContent); + return HasImageRequest(*aContent) && + DraggableOverride(*aContent).valueOr(true); +} + +// static +bool nsContentUtils::IsDraggableLink(const nsIContent* aContent) { + MOZ_ASSERT(aContent); + return IsLinkWithURI(*aContent) && DraggableOverride(*aContent).valueOr(true); +} + +// static +nsresult nsContentUtils::QNameChanged(mozilla::dom::NodeInfo* aNodeInfo, + nsAtom* aName, + mozilla::dom::NodeInfo** aResult) { + nsNodeInfoManager* niMgr = aNodeInfo->NodeInfoManager(); + + *aResult = niMgr + ->GetNodeInfo(aName, nullptr, aNodeInfo->NamespaceID(), + aNodeInfo->NodeType(), aNodeInfo->GetExtraName()) + .take(); + return NS_OK; +} + +static bool TestSitePerm(nsIPrincipal* aPrincipal, const nsACString& aType, + uint32_t aPerm, bool aExactHostMatch) { + if (!aPrincipal) { + // We always deny (i.e. don't allow) the permission if we don't have a + // principal. + return aPerm != nsIPermissionManager::ALLOW_ACTION; + } + + nsCOMPtr<nsIPermissionManager> permMgr = + components::PermissionManager::Service(); + NS_ENSURE_TRUE(permMgr, false); + + uint32_t perm; + nsresult rv; + if (aExactHostMatch) { + rv = permMgr->TestExactPermissionFromPrincipal(aPrincipal, aType, &perm); + } else { + rv = permMgr->TestPermissionFromPrincipal(aPrincipal, aType, &perm); + } + NS_ENSURE_SUCCESS(rv, false); + + return perm == aPerm; +} + +bool nsContentUtils::IsSitePermAllow(nsIPrincipal* aPrincipal, + const nsACString& aType) { + return TestSitePerm(aPrincipal, aType, nsIPermissionManager::ALLOW_ACTION, + false); +} + +bool nsContentUtils::IsSitePermDeny(nsIPrincipal* aPrincipal, + const nsACString& aType) { + return TestSitePerm(aPrincipal, aType, nsIPermissionManager::DENY_ACTION, + false); +} + +bool nsContentUtils::IsExactSitePermAllow(nsIPrincipal* aPrincipal, + const nsACString& aType) { + return TestSitePerm(aPrincipal, aType, nsIPermissionManager::ALLOW_ACTION, + true); +} + +bool nsContentUtils::IsExactSitePermDeny(nsIPrincipal* aPrincipal, + const nsACString& aType) { + return TestSitePerm(aPrincipal, aType, nsIPermissionManager::DENY_ACTION, + true); +} + +bool nsContentUtils::HasSitePerm(nsIPrincipal* aPrincipal, + const nsACString& aType) { + if (!aPrincipal) { + return false; + } + + nsCOMPtr<nsIPermissionManager> permMgr = + components::PermissionManager::Service(); + NS_ENSURE_TRUE(permMgr, false); + + uint32_t perm; + nsresult rv = permMgr->TestPermissionFromPrincipal(aPrincipal, aType, &perm); + NS_ENSURE_SUCCESS(rv, false); + + return perm != nsIPermissionManager::UNKNOWN_ACTION; +} + +static const char* gEventNames[] = {"event"}; +static const char* gSVGEventNames[] = {"evt"}; +// for b/w compat, the first name to onerror is still 'event', even though it +// is actually the error message +static const char* gOnErrorNames[] = {"event", "source", "lineno", "colno", + "error"}; + +// static +void nsContentUtils::GetEventArgNames(int32_t aNameSpaceID, nsAtom* aEventName, + bool aIsForWindow, uint32_t* aArgCount, + const char*** aArgArray) { +#define SET_EVENT_ARG_NAMES(names) \ + *aArgCount = sizeof(names) / sizeof(names[0]); \ + *aArgArray = names; + + // JSEventHandler is what does the arg magic for onerror, and it does + // not seem to take the namespace into account. So we let onerror in all + // namespaces get the 3 arg names. + if (aEventName == nsGkAtoms::onerror && aIsForWindow) { + SET_EVENT_ARG_NAMES(gOnErrorNames); + } else if (aNameSpaceID == kNameSpaceID_SVG) { + SET_EVENT_ARG_NAMES(gSVGEventNames); + } else { + SET_EVENT_ARG_NAMES(gEventNames); + } +} + +// Note: The list of content bundles in nsStringBundle.cpp should be updated +// whenever entries are added or removed from this list. +static const char* gPropertiesFiles[nsContentUtils::PropertiesFile_COUNT] = { + // Must line up with the enum values in |PropertiesFile| enum. + "chrome://global/locale/css.properties", + "chrome://global/locale/xul.properties", + "chrome://global/locale/layout_errors.properties", + "chrome://global/locale/layout/HtmlForm.properties", + "chrome://global/locale/printing.properties", + "chrome://global/locale/dom/dom.properties", + "chrome://global/locale/layout/htmlparser.properties", + "chrome://global/locale/svg/svg.properties", + "chrome://branding/locale/brand.properties", + "chrome://global/locale/commonDialogs.properties", + "chrome://global/locale/mathml/mathml.properties", + "chrome://global/locale/security/security.properties", + "chrome://necko/locale/necko.properties", + "resource://gre/res/locale/layout/HtmlForm.properties", + "resource://gre/res/locale/dom/dom.properties"}; + +/* static */ +nsresult nsContentUtils::EnsureStringBundle(PropertiesFile aFile) { + MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread(), + "Should not create bundles off main thread."); + if (!sStringBundles[aFile]) { + if (!sStringBundleService) { + nsresult rv = + CallGetService(NS_STRINGBUNDLE_CONTRACTID, &sStringBundleService); + NS_ENSURE_SUCCESS(rv, rv); + } + RefPtr<nsIStringBundle> bundle; + MOZ_TRY(sStringBundleService->CreateBundle(gPropertiesFiles[aFile], + getter_AddRefs(bundle))); + sStringBundles[aFile] = bundle.forget(); + } + return NS_OK; +} + +/* static */ +void nsContentUtils::AsyncPrecreateStringBundles() { + // We only ever want to pre-create bundles in the parent process. + // + // All nsContentUtils bundles are shared between the parent and child + // precesses, and the shared memory regions that back them *must* be created + // in the parent, and then sent to all children. + // + // If we attempt to create a bundle in the child before its memory region is + // available, we need to create a temporary non-shared bundle, and later + // replace that with the shared memory copy. So attempting to pre-load in the + // child is wasteful and unnecessary. + MOZ_ASSERT(XRE_IsParentProcess()); + + for (uint32_t bundleIndex = 0; bundleIndex < PropertiesFile_COUNT; + ++bundleIndex) { + nsresult rv = NS_DispatchToCurrentThreadQueue( + NS_NewRunnableFunction("AsyncPrecreateStringBundles", + [bundleIndex]() { + PropertiesFile file = + static_cast<PropertiesFile>(bundleIndex); + EnsureStringBundle(file); + nsIStringBundle* bundle = sStringBundles[file]; + bundle->AsyncPreload(); + }), + EventQueuePriority::Idle); + Unused << NS_WARN_IF(NS_FAILED(rv)); + } +} + +/* static */ +bool nsContentUtils::SpoofLocaleEnglish() { + // 0 - will prompt + // 1 - don't spoof + // 2 - spoof + return StaticPrefs::privacy_spoof_english() == 2; +} + +static nsContentUtils::PropertiesFile GetMaybeSpoofedPropertiesFile( + nsContentUtils::PropertiesFile aFile, const char* aKey, + Document* aDocument) { + // When we spoof English, use en-US properties in strings that are accessible + // by content. + bool spoofLocale = nsContentUtils::SpoofLocaleEnglish() && + (!aDocument || !aDocument->AllowsL10n()); + if (spoofLocale) { + switch (aFile) { + case nsContentUtils::eFORMS_PROPERTIES: + return nsContentUtils::eFORMS_PROPERTIES_en_US; + case nsContentUtils::eDOM_PROPERTIES: + return nsContentUtils::eDOM_PROPERTIES_en_US; + default: + break; + } + } + return aFile; +} + +/* static */ +nsresult nsContentUtils::GetMaybeLocalizedString(PropertiesFile aFile, + const char* aKey, + Document* aDocument, + nsAString& aResult) { + return GetLocalizedString( + GetMaybeSpoofedPropertiesFile(aFile, aKey, aDocument), aKey, aResult); +} + +/* static */ +nsresult nsContentUtils::GetLocalizedString(PropertiesFile aFile, + const char* aKey, + nsAString& aResult) { + return FormatLocalizedString(aFile, aKey, {}, aResult); +} + +/* static */ +nsresult nsContentUtils::FormatMaybeLocalizedString( + PropertiesFile aFile, const char* aKey, Document* aDocument, + const nsTArray<nsString>& aParams, nsAString& aResult) { + return FormatLocalizedString( + GetMaybeSpoofedPropertiesFile(aFile, aKey, aDocument), aKey, aParams, + aResult); +} + +class FormatLocalizedStringRunnable final : public WorkerMainThreadRunnable { + public: + FormatLocalizedStringRunnable(WorkerPrivate* aWorkerPrivate, + nsContentUtils::PropertiesFile aFile, + const char* aKey, + const nsTArray<nsString>& aParams, + nsAString& aLocalizedString) + : WorkerMainThreadRunnable(aWorkerPrivate, + "FormatLocalizedStringRunnable"_ns), + mFile(aFile), + mKey(aKey), + mParams(aParams), + mLocalizedString(aLocalizedString) { + MOZ_ASSERT(aWorkerPrivate); + aWorkerPrivate->AssertIsOnWorkerThread(); + } + + bool MainThreadRun() override { + AssertIsOnMainThread(); + + mResult = nsContentUtils::FormatLocalizedString(mFile, mKey, mParams, + mLocalizedString); + Unused << NS_WARN_IF(NS_FAILED(mResult)); + return true; + } + + nsresult GetResult() const { return mResult; } + + private: + const nsContentUtils::PropertiesFile mFile; + const char* mKey; + const nsTArray<nsString>& mParams; + nsresult mResult = NS_ERROR_FAILURE; + nsAString& mLocalizedString; +}; + +/* static */ +nsresult nsContentUtils::FormatLocalizedString( + PropertiesFile aFile, const char* aKey, const nsTArray<nsString>& aParams, + nsAString& aResult) { + if (!NS_IsMainThread()) { + // nsIStringBundle is thread-safe but its creation is not, and in particular + // we don't create and store nsIStringBundle objects in a thread-safe way. + // + // TODO(emilio): Maybe if we already have the right bundle created we could + // just call into it, but we should make sure that Shutdown() doesn't get + // called on the main thread when that happens which is a bit tricky to + // prove? + WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate(); + if (NS_WARN_IF(!workerPrivate)) { + return NS_ERROR_UNEXPECTED; + } + + auto runnable = MakeRefPtr<FormatLocalizedStringRunnable>( + workerPrivate, aFile, aKey, aParams, aResult); + + runnable->Dispatch(Canceling, IgnoreErrors()); + return runnable->GetResult(); + } + + MOZ_TRY(EnsureStringBundle(aFile)); + nsIStringBundle* bundle = sStringBundles[aFile]; + if (aParams.IsEmpty()) { + return bundle->GetStringFromName(aKey, aResult); + } + return bundle->FormatStringFromName(aKey, aParams, aResult); +} + +/* static */ +void nsContentUtils::LogSimpleConsoleError(const nsAString& aErrorText, + const nsACString& aCategory, + bool aFromPrivateWindow, + bool aFromChromeContext, + uint32_t aErrorFlags) { + nsCOMPtr<nsIScriptError> scriptError = + do_CreateInstance(NS_SCRIPTERROR_CONTRACTID); + if (scriptError) { + nsCOMPtr<nsIConsoleService> console = + do_GetService(NS_CONSOLESERVICE_CONTRACTID); + if (console && NS_SUCCEEDED(scriptError->Init( + aErrorText, u""_ns, u""_ns, 0, 0, aErrorFlags, aCategory, + aFromPrivateWindow, aFromChromeContext))) { + console->LogMessage(scriptError); + } + } +} + +/* static */ +nsresult nsContentUtils::ReportToConsole( + uint32_t aErrorFlags, const nsACString& aCategory, + const Document* aDocument, PropertiesFile aFile, const char* aMessageName, + const nsTArray<nsString>& aParams, nsIURI* aURI, + const nsString& aSourceLine, uint32_t aLineNumber, uint32_t aColumnNumber) { + nsresult rv; + nsAutoString errorText; + if (!aParams.IsEmpty()) { + rv = FormatLocalizedString(aFile, aMessageName, aParams, errorText); + } else { + rv = GetLocalizedString(aFile, aMessageName, errorText); + } + NS_ENSURE_SUCCESS(rv, rv); + + return ReportToConsoleNonLocalized(errorText, aErrorFlags, aCategory, + aDocument, aURI, aSourceLine, aLineNumber, + aColumnNumber); +} + +/* static */ +void nsContentUtils::ReportEmptyGetElementByIdArg(const Document* aDoc) { + ReportToConsole(nsIScriptError::warningFlag, "DOM"_ns, aDoc, + nsContentUtils::eDOM_PROPERTIES, "EmptyGetElementByIdParam"); +} + +/* static */ +nsresult nsContentUtils::ReportToConsoleNonLocalized( + const nsAString& aErrorText, uint32_t aErrorFlags, + const nsACString& aCategory, const Document* aDocument, nsIURI* aURI, + const nsString& aSourceLine, uint32_t aLineNumber, uint32_t aColumnNumber, + MissingErrorLocationMode aLocationMode) { + uint64_t innerWindowID = 0; + if (aDocument) { + if (!aURI) { + aURI = aDocument->GetDocumentURI(); + } + innerWindowID = aDocument->InnerWindowID(); + } + + return ReportToConsoleByWindowID(aErrorText, aErrorFlags, aCategory, + innerWindowID, aURI, aSourceLine, + aLineNumber, aColumnNumber, aLocationMode); +} + +/* static */ +nsresult nsContentUtils::ReportToConsoleByWindowID( + const nsAString& aErrorText, uint32_t aErrorFlags, + const nsACString& aCategory, uint64_t aInnerWindowID, nsIURI* aURI, + const nsString& aSourceLine, uint32_t aLineNumber, uint32_t aColumnNumber, + MissingErrorLocationMode aLocationMode) { + nsresult rv; + if (!sConsoleService) { // only need to bother null-checking here + rv = CallGetService(NS_CONSOLESERVICE_CONTRACTID, &sConsoleService); + NS_ENSURE_SUCCESS(rv, rv); + } + + nsAutoString spec; + if (!aLineNumber && aLocationMode == eUSE_CALLING_LOCATION) { + JSContext* cx = GetCurrentJSContext(); + if (cx) { + nsJSUtils::GetCallingLocation(cx, spec, &aLineNumber, &aColumnNumber); + } + } + + nsCOMPtr<nsIScriptError> errorObject = + do_CreateInstance(NS_SCRIPTERROR_CONTRACTID, &rv); + NS_ENSURE_SUCCESS(rv, rv); + + if (!spec.IsEmpty()) { + rv = errorObject->InitWithWindowID(aErrorText, + spec, // file name + aSourceLine, aLineNumber, aColumnNumber, + aErrorFlags, aCategory, aInnerWindowID); + } else { + rv = errorObject->InitWithSourceURI(aErrorText, aURI, aSourceLine, + aLineNumber, aColumnNumber, aErrorFlags, + aCategory, aInnerWindowID); + } + NS_ENSURE_SUCCESS(rv, rv); + + return sConsoleService->LogMessage(errorObject); +} + +void nsContentUtils::LogMessageToConsole(const char* aMsg) { + if (!sConsoleService) { // only need to bother null-checking here + CallGetService(NS_CONSOLESERVICE_CONTRACTID, &sConsoleService); + if (!sConsoleService) { + return; + } + } + sConsoleService->LogStringMessage(NS_ConvertUTF8toUTF16(aMsg).get()); +} + +bool nsContentUtils::IsChromeDoc(const Document* aDocument) { + return aDocument && aDocument->NodePrincipal() == sSystemPrincipal; +} + +bool nsContentUtils::IsChildOfSameType(Document* aDoc) { + if (BrowsingContext* bc = aDoc->GetBrowsingContext()) { + return bc->GetParent(); + } + return false; +} + +bool nsContentUtils::IsPlainTextType(const nsACString& aContentType) { + // NOTE: if you add a type here, add it to the CONTENTDLF_CATEGORIES + // define in nsContentDLF.h as well. + return aContentType.EqualsLiteral(TEXT_PLAIN) || + aContentType.EqualsLiteral(TEXT_CSS) || + aContentType.EqualsLiteral(TEXT_CACHE_MANIFEST) || + aContentType.EqualsLiteral(TEXT_VTT) || + aContentType.EqualsLiteral(APPLICATION_JAVASCRIPT) || + aContentType.EqualsLiteral(APPLICATION_XJAVASCRIPT) || + aContentType.EqualsLiteral(TEXT_ECMASCRIPT) || + aContentType.EqualsLiteral(APPLICATION_ECMASCRIPT) || + aContentType.EqualsLiteral(TEXT_JAVASCRIPT) || + aContentType.EqualsLiteral(APPLICATION_JSON) || + aContentType.EqualsLiteral(TEXT_JSON); +} + +bool nsContentUtils::IsUtf8OnlyPlainTextType(const nsACString& aContentType) { + // NOTE: This must be a subset of the list in IsPlainTextType(). + return aContentType.EqualsLiteral(TEXT_CACHE_MANIFEST) || + aContentType.EqualsLiteral(APPLICATION_JSON) || + aContentType.EqualsLiteral(TEXT_JSON) || + aContentType.EqualsLiteral(TEXT_VTT); +} + +bool nsContentUtils::IsInChromeDocshell(const Document* aDocument) { + return aDocument && aDocument->IsInChromeDocShell(); +} + +// static +nsIContentPolicy* nsContentUtils::GetContentPolicy() { + if (!sTriedToGetContentPolicy) { + CallGetService(NS_CONTENTPOLICY_CONTRACTID, &sContentPolicyService); + // It's OK to not have a content policy service + sTriedToGetContentPolicy = true; + } + + return sContentPolicyService; +} + +// static +bool nsContentUtils::IsEventAttributeName(nsAtom* aName, int32_t aType) { + const char16_t* name = aName->GetUTF16String(); + if (name[0] != 'o' || name[1] != 'n') { + return false; + } + + EventNameMapping mapping; + return (sAtomEventTable->Get(aName, &mapping) && mapping.mType & aType); +} + +// static +EventMessage nsContentUtils::GetEventMessage(nsAtom* aName) { + MOZ_ASSERT(NS_IsMainThread(), "sAtomEventTable is not threadsafe"); + if (aName) { + EventNameMapping mapping; + if (sAtomEventTable->Get(aName, &mapping)) { + return mapping.mMessage; + } + } + + return eUnidentifiedEvent; +} + +// static +mozilla::EventClassID nsContentUtils::GetEventClassID(const nsAString& aName) { + EventNameMapping mapping; + if (sStringEventTable->Get(aName, &mapping)) return mapping.mEventClassID; + + return eBasicEventClass; +} + +nsAtom* nsContentUtils::GetEventMessageAndAtom( + const nsAString& aName, mozilla::EventClassID aEventClassID, + EventMessage* aEventMessage) { + MOZ_ASSERT(NS_IsMainThread(), "Our hashtables are not threadsafe"); + EventNameMapping mapping; + if (sStringEventTable->Get(aName, &mapping)) { + *aEventMessage = mapping.mEventClassID == aEventClassID + ? mapping.mMessage + : eUnidentifiedEvent; + return mapping.mAtom; + } + + // If we have cached lots of user defined event names, clear some of them. + if (sUserDefinedEvents->Length() > 127) { + while (sUserDefinedEvents->Length() > 64) { + nsAtom* first = sUserDefinedEvents->ElementAt(0); + sStringEventTable->Remove(Substring(nsDependentAtomString(first), 2)); + sUserDefinedEvents->RemoveElementAt(0); + } + } + + *aEventMessage = eUnidentifiedEvent; + RefPtr<nsAtom> atom = NS_AtomizeMainThread(u"on"_ns + aName); + sUserDefinedEvents->AppendElement(atom); + mapping.mAtom = atom; + mapping.mMessage = eUnidentifiedEvent; + mapping.mType = EventNameType_None; + mapping.mEventClassID = eBasicEventClass; + // This is a slow hashtable call, but at least we cache the result for the + // following calls. Because GetEventMessageAndAtomForListener utilizes + // sStringEventTable, it needs to know in which cases sStringEventTable + // doesn't contain the information it needs so that it can use + // sAtomEventTable instead. + mapping.mMaybeSpecialSVGorSMILEvent = + GetEventMessage(atom) != eUnidentifiedEvent; + sStringEventTable->InsertOrUpdate(aName, mapping); + return mapping.mAtom; +} + +// static +EventMessage nsContentUtils::GetEventMessageAndAtomForListener( + const nsAString& aName, nsAtom** aOnName) { + MOZ_ASSERT(NS_IsMainThread(), "Our hashtables are not threadsafe"); + + // Because of SVG/SMIL sStringEventTable contains a subset of the event names + // comparing to the sAtomEventTable. However, usually sStringEventTable + // contains the information we need, so in order to reduce hashtable + // lookups, start from it. + EventNameMapping mapping; + EventMessage msg = eUnidentifiedEvent; + RefPtr<nsAtom> atom; + if (sStringEventTable->Get(aName, &mapping)) { + if (mapping.mMaybeSpecialSVGorSMILEvent) { + // Try the atom version so that we should get the right message for + // SVG/SMIL. + atom = NS_AtomizeMainThread(u"on"_ns + aName); + msg = GetEventMessage(atom); + } else { + atom = mapping.mAtom; + msg = mapping.mMessage; + } + atom.forget(aOnName); + return msg; + } + + // GetEventMessageAndAtom will cache the event type for the future usage... + GetEventMessageAndAtom(aName, eBasicEventClass, &msg); + + // ...and then call this method recursively to get the message and atom from + // now updated sStringEventTable. + return GetEventMessageAndAtomForListener(aName, aOnName); +} + +static nsresult GetEventAndTarget(Document* aDoc, nsISupports* aTarget, + const nsAString& aEventName, + CanBubble aCanBubble, Cancelable aCancelable, + Composed aComposed, Trusted aTrusted, + Event** aEvent, EventTarget** aTargetOut) { + nsCOMPtr<EventTarget> target(do_QueryInterface(aTarget)); + NS_ENSURE_TRUE(aDoc && target, NS_ERROR_INVALID_ARG); + + ErrorResult err; + RefPtr<Event> event = + aDoc->CreateEvent(u"Events"_ns, CallerType::System, err); + if (NS_WARN_IF(err.Failed())) { + return err.StealNSResult(); + } + + event->InitEvent(aEventName, aCanBubble, aCancelable, aComposed); + event->SetTrusted(aTrusted == Trusted::eYes); + + event->SetTarget(target); + + event.forget(aEvent); + target.forget(aTargetOut); + return NS_OK; +} + +// static +nsresult nsContentUtils::DispatchTrustedEvent( + Document* aDoc, nsISupports* aTarget, const nsAString& aEventName, + CanBubble aCanBubble, Cancelable aCancelable, Composed aComposed, + bool* aDefaultAction) { + MOZ_ASSERT(!aEventName.EqualsLiteral("input") && + !aEventName.EqualsLiteral("beforeinput"), + "Use DispatchInputEvent() instead"); + return DispatchEvent(aDoc, aTarget, aEventName, aCanBubble, aCancelable, + aComposed, Trusted::eYes, aDefaultAction); +} + +// static +nsresult nsContentUtils::DispatchUntrustedEvent( + Document* aDoc, nsISupports* aTarget, const nsAString& aEventName, + CanBubble aCanBubble, Cancelable aCancelable, bool* aDefaultAction) { + return DispatchEvent(aDoc, aTarget, aEventName, aCanBubble, aCancelable, + Composed::eDefault, Trusted::eNo, aDefaultAction); +} + +// static +nsresult nsContentUtils::DispatchEvent(Document* aDoc, nsISupports* aTarget, + const nsAString& aEventName, + CanBubble aCanBubble, + Cancelable aCancelable, + Composed aComposed, Trusted aTrusted, + bool* aDefaultAction, + ChromeOnlyDispatch aOnlyChromeDispatch) { + RefPtr<Event> event; + nsCOMPtr<EventTarget> target; + nsresult rv = GetEventAndTarget( + aDoc, aTarget, aEventName, aCanBubble, aCancelable, aComposed, aTrusted, + getter_AddRefs(event), getter_AddRefs(target)); + NS_ENSURE_SUCCESS(rv, rv); + event->WidgetEventPtr()->mFlags.mOnlyChromeDispatch = + aOnlyChromeDispatch == ChromeOnlyDispatch::eYes; + + ErrorResult err; + bool doDefault = target->DispatchEvent(*event, CallerType::System, err); + if (aDefaultAction) { + *aDefaultAction = doDefault; + } + return err.StealNSResult(); +} + +// static +nsresult nsContentUtils::DispatchEvent(Document* aDoc, nsISupports* aTarget, + WidgetEvent& aEvent, + EventMessage aEventMessage, + CanBubble aCanBubble, + Cancelable aCancelable, Trusted aTrusted, + bool* aDefaultAction, + ChromeOnlyDispatch aOnlyChromeDispatch) { + MOZ_ASSERT_IF(aOnlyChromeDispatch == ChromeOnlyDispatch::eYes, + aTrusted == Trusted::eYes); + + nsCOMPtr<EventTarget> target(do_QueryInterface(aTarget)); + + aEvent.mSpecifiedEventType = GetEventTypeFromMessage(aEventMessage); + aEvent.SetDefaultComposed(); + aEvent.SetDefaultComposedInNativeAnonymousContent(); + + aEvent.mFlags.mBubbles = aCanBubble == CanBubble::eYes; + aEvent.mFlags.mCancelable = aCancelable == Cancelable::eYes; + aEvent.mFlags.mOnlyChromeDispatch = + aOnlyChromeDispatch == ChromeOnlyDispatch::eYes; + + aEvent.mTarget = target; + + nsEventStatus status = nsEventStatus_eIgnore; + nsresult rv = EventDispatcher::DispatchDOMEvent(target, &aEvent, nullptr, + nullptr, &status); + if (aDefaultAction) { + *aDefaultAction = (status != nsEventStatus_eConsumeNoDefault); + } + return rv; +} + +// static +nsresult nsContentUtils::DispatchInputEvent(Element* aEventTarget) { + return DispatchInputEvent(aEventTarget, mozilla::eEditorInput, + mozilla::EditorInputType::eUnknown, nullptr, + InputEventOptions()); +} + +// static +nsresult nsContentUtils::DispatchInputEvent( + Element* aEventTargetElement, EventMessage aEventMessage, + EditorInputType aEditorInputType, EditorBase* aEditorBase, + InputEventOptions&& aOptions, nsEventStatus* aEventStatus /* = nullptr */) { + MOZ_ASSERT(aEventMessage == eEditorInput || + aEventMessage == eEditorBeforeInput); + + if (NS_WARN_IF(!aEventTargetElement)) { + return NS_ERROR_INVALID_ARG; + } + + // If this is called from editor, the instance should be set to aEditorBase. + // Otherwise, we need to look for an editor for aEventTargetElement. + // However, we don't need to do it for HTMLEditor since nobody shouldn't + // dispatch "beforeinput" nor "input" event for HTMLEditor except HTMLEditor + // itself. + bool useInputEvent = false; + if (aEditorBase) { + useInputEvent = true; + } else if (HTMLTextAreaElement* textAreaElement = + HTMLTextAreaElement::FromNode(aEventTargetElement)) { + aEditorBase = textAreaElement->GetTextEditorWithoutCreation(); + useInputEvent = true; + } else if (HTMLInputElement* inputElement = + HTMLInputElement::FromNode(aEventTargetElement)) { + if (inputElement->IsInputEventTarget()) { + aEditorBase = inputElement->GetTextEditorWithoutCreation(); + useInputEvent = true; + } + } +#ifdef DEBUG + else { + MOZ_ASSERT(!aEventTargetElement->IsTextControlElement(), + "The event target may have editor, but we've not known it yet."); + } +#endif // #ifdef DEBUG + + if (!useInputEvent) { + MOZ_ASSERT(aEventMessage == eEditorInput); + MOZ_ASSERT(aEditorInputType == EditorInputType::eUnknown); + MOZ_ASSERT(!aOptions.mNeverCancelable); + // Dispatch "input" event with Event instance. + WidgetEvent widgetEvent(true, eUnidentifiedEvent); + widgetEvent.mSpecifiedEventType = nsGkAtoms::oninput; + widgetEvent.mFlags.mCancelable = false; + widgetEvent.mFlags.mComposed = true; + return AsyncEventDispatcher::RunDOMEventWhenSafe(*aEventTargetElement, + widgetEvent, aEventStatus); + } + + MOZ_ASSERT_IF(aEventMessage != eEditorBeforeInput, + !aOptions.mNeverCancelable); + MOZ_ASSERT_IF( + aEventMessage == eEditorBeforeInput && aOptions.mNeverCancelable, + aEditorInputType == EditorInputType::eInsertReplacementText); + + nsCOMPtr<nsIWidget> widget; + if (aEditorBase) { + widget = aEditorBase->GetWidget(); + if (NS_WARN_IF(!widget)) { + return NS_ERROR_FAILURE; + } + } else { + Document* document = aEventTargetElement->OwnerDoc(); + if (NS_WARN_IF(!document)) { + return NS_ERROR_FAILURE; + } + // If we're running xpcshell tests, we fail to get presShell here. + // Even in such case, we need to dispatch "input" event without widget. + PresShell* presShell = document->GetPresShell(); + if (presShell) { + nsPresContext* presContext = presShell->GetPresContext(); + if (NS_WARN_IF(!presContext)) { + return NS_ERROR_FAILURE; + } + widget = presContext->GetRootWidget(); + if (NS_WARN_IF(!widget)) { + return NS_ERROR_FAILURE; + } + } + } + + // Dispatch "input" event with InputEvent instance. + InternalEditorInputEvent inputEvent(true, aEventMessage, widget); + + inputEvent.mFlags.mCancelable = + !aOptions.mNeverCancelable && aEventMessage == eEditorBeforeInput && + IsCancelableBeforeInputEvent(aEditorInputType); + MOZ_ASSERT(!inputEvent.mFlags.mCancelable || aEventStatus); + + // If there is an editor, set isComposing to true when it has composition. + // Note that EditorBase::IsIMEComposing() may return false even when we + // need to set it to true. + // Otherwise, i.e., editor hasn't been created for the element yet, + // we should set isComposing to false since the element can never has + // composition without editor. + inputEvent.mIsComposing = aEditorBase && aEditorBase->GetComposition(); + + if (!aEditorBase || aEditorBase->IsTextEditor()) { + if (IsDataAvailableOnTextEditor(aEditorInputType)) { + inputEvent.mData = std::move(aOptions.mData); + MOZ_ASSERT(!inputEvent.mData.IsVoid(), + "inputEvent.mData shouldn't be void"); + } +#ifdef DEBUG + else { + MOZ_ASSERT(inputEvent.mData.IsVoid(), "inputEvent.mData should be void"); + } +#endif // #ifdef DEBUG + MOZ_ASSERT( + aOptions.mTargetRanges.IsEmpty(), + "Target ranges for <input> and <textarea> should always be empty"); + } else { + MOZ_ASSERT(aEditorBase->IsHTMLEditor()); + if (IsDataAvailableOnHTMLEditor(aEditorInputType)) { + inputEvent.mData = std::move(aOptions.mData); + MOZ_ASSERT(!inputEvent.mData.IsVoid(), + "inputEvent.mData shouldn't be void"); + } else { + MOZ_ASSERT(inputEvent.mData.IsVoid(), "inputEvent.mData should be void"); + if (IsDataTransferAvailableOnHTMLEditor(aEditorInputType)) { + inputEvent.mDataTransfer = std::move(aOptions.mDataTransfer); + MOZ_ASSERT(inputEvent.mDataTransfer, + "inputEvent.mDataTransfer shouldn't be nullptr"); + MOZ_ASSERT(inputEvent.mDataTransfer->IsReadOnly(), + "inputEvent.mDataTransfer should be read only"); + } +#ifdef DEBUG + else { + MOZ_ASSERT(!inputEvent.mDataTransfer, + "inputEvent.mDataTransfer should be nullptr"); + } +#endif // #ifdef DEBUG + } + if (aEventMessage == eEditorBeforeInput && + MayHaveTargetRangesOnHTMLEditor(aEditorInputType)) { + inputEvent.mTargetRanges = std::move(aOptions.mTargetRanges); + } +#ifdef DEBUG + else { + MOZ_ASSERT(aOptions.mTargetRanges.IsEmpty(), + "Target ranges shouldn't be set for the dispatching event"); + } +#endif // #ifdef DEBUG + } + + inputEvent.mInputType = aEditorInputType; + + // If we cannot dispatch an event right now, we cannot make it cancelable. + if (!nsContentUtils::IsSafeToRunScript()) { + NS_ASSERTION( + !inputEvent.mFlags.mCancelable, + "Cancelable beforeinput event dispatcher should run when it's safe"); + inputEvent.mFlags.mCancelable = false; + } + return AsyncEventDispatcher::RunDOMEventWhenSafe(*aEventTargetElement, + inputEvent, aEventStatus); +} + +nsresult nsContentUtils::DispatchChromeEvent( + Document* aDoc, nsISupports* aTarget, const nsAString& aEventName, + CanBubble aCanBubble, Cancelable aCancelable, bool* aDefaultAction) { + RefPtr<Event> event; + nsCOMPtr<EventTarget> target; + nsresult rv = GetEventAndTarget( + aDoc, aTarget, aEventName, aCanBubble, aCancelable, Composed::eDefault, + Trusted::eYes, getter_AddRefs(event), getter_AddRefs(target)); + NS_ENSURE_SUCCESS(rv, rv); + + NS_ASSERTION(aDoc, "GetEventAndTarget lied?"); + if (!aDoc->GetWindow()) return NS_ERROR_INVALID_ARG; + + EventTarget* piTarget = aDoc->GetWindow()->GetParentTarget(); + if (!piTarget) return NS_ERROR_INVALID_ARG; + + ErrorResult err; + bool defaultActionEnabled = + piTarget->DispatchEvent(*event, CallerType::System, err); + if (aDefaultAction) { + *aDefaultAction = defaultActionEnabled; + } + return err.StealNSResult(); +} + +void nsContentUtils::RequestFrameFocus(Element& aFrameElement, bool aCanRaise, + CallerType aCallerType) { + RefPtr<Element> target = &aFrameElement; + bool defaultAction = true; + if (aCanRaise) { + DispatchEventOnlyToChrome(target->OwnerDoc(), target, + u"framefocusrequested"_ns, CanBubble::eYes, + Cancelable::eYes, &defaultAction); + } + if (!defaultAction) { + return; + } + + RefPtr<nsFocusManager> fm = nsFocusManager::GetFocusManager(); + if (!fm) { + return; + } + + uint32_t flags = nsIFocusManager::FLAG_NOSCROLL; + if (aCanRaise) { + flags |= nsIFocusManager::FLAG_RAISE; + } + + if (aCallerType == CallerType::NonSystem) { + flags |= nsIFocusManager::FLAG_NONSYSTEMCALLER; + } + + fm->SetFocus(target, flags); +} + +nsresult nsContentUtils::DispatchEventOnlyToChrome( + Document* aDoc, nsISupports* aTarget, const nsAString& aEventName, + CanBubble aCanBubble, Cancelable aCancelable, Composed aComposed, + bool* aDefaultAction) { + return DispatchEvent(aDoc, aTarget, aEventName, aCanBubble, aCancelable, + aComposed, Trusted::eYes, aDefaultAction, + ChromeOnlyDispatch::eYes); +} + +/* static */ +Element* nsContentUtils::MatchElementId(nsIContent* aContent, + const nsAtom* aId) { + for (nsIContent* cur = aContent; cur; cur = cur->GetNextNode(aContent)) { + if (aId == cur->GetID()) { + return cur->AsElement(); + } + } + + return nullptr; +} + +/* static */ +Element* nsContentUtils::MatchElementId(nsIContent* aContent, + const nsAString& aId) { + MOZ_ASSERT(!aId.IsEmpty(), "Will match random elements"); + + // ID attrs are generally stored as atoms, so just atomize this up front + RefPtr<nsAtom> id(NS_Atomize(aId)); + if (!id) { + // OOM, so just bail + return nullptr; + } + + return MatchElementId(aContent, id); +} + +/* static */ +void nsContentUtils::RegisterShutdownObserver(nsIObserver* aObserver) { + nsCOMPtr<nsIObserverService> observerService = + mozilla::services::GetObserverService(); + if (observerService) { + observerService->AddObserver(aObserver, NS_XPCOM_SHUTDOWN_OBSERVER_ID, + false); + } +} + +/* static */ +void nsContentUtils::UnregisterShutdownObserver(nsIObserver* aObserver) { + nsCOMPtr<nsIObserverService> observerService = + mozilla::services::GetObserverService(); + if (observerService) { + observerService->RemoveObserver(aObserver, NS_XPCOM_SHUTDOWN_OBSERVER_ID); + } +} + +/* static */ +bool nsContentUtils::HasNonEmptyAttr(const nsIContent* aContent, + int32_t aNameSpaceID, nsAtom* aName) { + static AttrArray::AttrValuesArray strings[] = {nsGkAtoms::_empty, nullptr}; + return aContent->IsElement() && + aContent->AsElement()->FindAttrValueIn(aNameSpaceID, aName, strings, + eCaseMatters) == + AttrArray::ATTR_VALUE_NO_MATCH; +} + +/* static */ +bool nsContentUtils::HasMutationListeners(nsINode* aNode, uint32_t aType, + nsINode* aTargetForSubtreeModified) { + Document* doc = aNode->OwnerDoc(); + + // global object will be null for documents that don't have windows. + nsPIDOMWindowInner* window = doc->GetInnerWindow(); + // This relies on EventListenerManager::AddEventListener, which sets + // all mutation bits when there is a listener for DOMSubtreeModified event. + if (window && !window->HasMutationListeners(aType)) { + return false; + } + + if (aNode->ChromeOnlyAccess() || aNode->IsInShadowTree()) { + return false; + } + + doc->MayDispatchMutationEvent(aTargetForSubtreeModified); + + // If we have a window, we can check it for mutation listeners now. + if (aNode->IsInUncomposedDoc()) { + nsCOMPtr<EventTarget> piTarget(do_QueryInterface(window)); + if (piTarget) { + EventListenerManager* manager = piTarget->GetExistingListenerManager(); + if (manager && manager->HasMutationListeners()) { + return true; + } + } + } + + // If we have a window, we know a mutation listener is registered, but it + // might not be in our chain. If we don't have a window, we might have a + // mutation listener. Check quickly to see. + while (aNode) { + EventListenerManager* manager = aNode->GetExistingListenerManager(); + if (manager && manager->HasMutationListeners()) { + return true; + } + + aNode = aNode->GetParentNode(); + } + + return false; +} + +/* static */ +bool nsContentUtils::HasMutationListeners(Document* aDocument, uint32_t aType) { + nsPIDOMWindowInner* window = + aDocument ? aDocument->GetInnerWindow() : nullptr; + + // This relies on EventListenerManager::AddEventListener, which sets + // all mutation bits when there is a listener for DOMSubtreeModified event. + return !window || window->HasMutationListeners(aType); +} + +void nsContentUtils::MaybeFireNodeRemoved(nsINode* aChild, nsINode* aParent) { + MOZ_ASSERT(aChild, "Missing child"); + MOZ_ASSERT(aChild->GetParentNode() == aParent, "Wrong parent"); + MOZ_ASSERT(aChild->OwnerDoc() == aParent->OwnerDoc(), "Wrong owner-doc"); + + // Having an explicit check here since it's an easy mistake to fall into, + // and there might be existing code with problems. We'd rather be safe + // than fire DOMNodeRemoved in all corner cases. We also rely on it for + // nsAutoScriptBlockerSuppressNodeRemoved. + if (!IsSafeToRunScript()) { + // This checks that IsSafeToRunScript is true since we don't want to fire + // events when that is false. We can't rely on EventDispatcher to assert + // this in this situation since most of the time there are no mutation + // event listeners, in which case we won't even attempt to dispatch events. + // However this also allows for two exceptions. First off, we don't assert + // if the mutation happens to native anonymous content since we never fire + // mutation events on such content anyway. + // Second, we don't assert if sDOMNodeRemovedSuppressCount is true since + // that is a know case when we'd normally fire a mutation event, but can't + // make that safe and so we suppress it at this time. Ideally this should + // go away eventually. + if (!aChild->IsInNativeAnonymousSubtree() && + !sDOMNodeRemovedSuppressCount) { + NS_ERROR("Want to fire DOMNodeRemoved event, but it's not safe"); + WarnScriptWasIgnored(aChild->OwnerDoc()); + } + return; + } + + { + Document* doc = aParent->OwnerDoc(); + if (MOZ_UNLIKELY(doc->DevToolsWatchingDOMMutations()) && + aChild->IsInComposedDoc() && !aChild->ChromeOnlyAccess()) { + DispatchChromeEvent(doc, aChild, u"devtoolschildremoved"_ns, + CanBubble::eNo, Cancelable::eNo); + } + } + + if (HasMutationListeners(aChild, NS_EVENT_BITS_MUTATION_NODEREMOVED, + aParent)) { + InternalMutationEvent mutation(true, eLegacyNodeRemoved); + mutation.mRelatedNode = aParent; + + mozAutoSubtreeModified subtree(aParent->OwnerDoc(), aParent); + EventDispatcher::Dispatch(aChild, nullptr, &mutation); + } +} + +void nsContentUtils::UnmarkGrayJSListenersInCCGenerationDocuments() { + if (!sEventListenerManagersHash) { + return; + } + + for (auto i = sEventListenerManagersHash->Iter(); !i.Done(); i.Next()) { + auto entry = static_cast<EventListenerManagerMapEntry*>(i.Get()); + nsINode* n = static_cast<nsINode*>(entry->mListenerManager->GetTarget()); + if (n && n->IsInComposedDoc() && + nsCCUncollectableMarker::InGeneration( + n->OwnerDoc()->GetMarkedCCGeneration())) { + entry->mListenerManager->MarkForCC(); + } + } +} + +/* static */ +void nsContentUtils::TraverseListenerManager( + nsINode* aNode, nsCycleCollectionTraversalCallback& cb) { + if (!sEventListenerManagersHash) { + // We're already shut down, just return. + return; + } + + auto entry = static_cast<EventListenerManagerMapEntry*>( + sEventListenerManagersHash->Search(aNode)); + if (entry) { + CycleCollectionNoteChild(cb, entry->mListenerManager.get(), + "[via hash] mListenerManager"); + } +} + +EventListenerManager* nsContentUtils::GetListenerManagerForNode( + nsINode* aNode) { + if (!sEventListenerManagersHash) { + // We're already shut down, don't bother creating an event listener + // manager. + + return nullptr; + } + + auto entry = static_cast<EventListenerManagerMapEntry*>( + sEventListenerManagersHash->Add(aNode, fallible)); + + if (!entry) { + return nullptr; + } + + if (!entry->mListenerManager) { + entry->mListenerManager = new EventListenerManager(aNode); + + aNode->SetFlags(NODE_HAS_LISTENERMANAGER); + } + + return entry->mListenerManager; +} + +EventListenerManager* nsContentUtils::GetExistingListenerManagerForNode( + const nsINode* aNode) { + if (!aNode->HasFlag(NODE_HAS_LISTENERMANAGER)) { + return nullptr; + } + + if (!sEventListenerManagersHash) { + // We're already shut down, don't bother creating an event listener + // manager. + + return nullptr; + } + + auto entry = static_cast<EventListenerManagerMapEntry*>( + sEventListenerManagersHash->Search(aNode)); + if (entry) { + return entry->mListenerManager; + } + + return nullptr; +} + +void nsContentUtils::AddEntryToDOMArenaTable(nsINode* aNode, + DOMArena* aDOMArena) { + MOZ_ASSERT(StaticPrefs::dom_arena_allocator_enabled_AtStartup()); + MOZ_ASSERT_IF(sDOMArenaHashtable, !sDOMArenaHashtable->Contains(aNode)); + MOZ_ASSERT(!aNode->HasFlag(NODE_KEEPS_DOMARENA)); + if (!sDOMArenaHashtable) { + sDOMArenaHashtable = + new nsRefPtrHashtable<nsPtrHashKey<const nsINode>, dom::DOMArena>(); + } + aNode->SetFlags(NODE_KEEPS_DOMARENA); + sDOMArenaHashtable->InsertOrUpdate(aNode, RefPtr<DOMArena>(aDOMArena)); +} + +already_AddRefed<DOMArena> nsContentUtils::TakeEntryFromDOMArenaTable( + const nsINode* aNode) { + MOZ_ASSERT(sDOMArenaHashtable->Contains(aNode)); + MOZ_ASSERT(StaticPrefs::dom_arena_allocator_enabled_AtStartup()); + RefPtr<DOMArena> arena; + sDOMArenaHashtable->Remove(aNode, getter_AddRefs(arena)); + return arena.forget(); +} + +/* static */ +void nsContentUtils::RemoveListenerManager(nsINode* aNode) { + if (sEventListenerManagersHash) { + auto entry = static_cast<EventListenerManagerMapEntry*>( + sEventListenerManagersHash->Search(aNode)); + if (entry) { + RefPtr<EventListenerManager> listenerManager; + listenerManager.swap(entry->mListenerManager); + // Remove the entry and *then* do operations that could cause further + // modification of sEventListenerManagersHash. See bug 334177. + sEventListenerManagersHash->RawRemove(entry); + if (listenerManager) { + listenerManager->Disconnect(); + } + } + } +} + +/* static */ +bool nsContentUtils::IsValidNodeName(nsAtom* aLocalName, nsAtom* aPrefix, + int32_t aNamespaceID) { + if (aNamespaceID == kNameSpaceID_Unknown) { + return false; + } + + if (!aPrefix) { + // If the prefix is null, then either the QName must be xmlns or the + // namespace must not be XMLNS. + return (aLocalName == nsGkAtoms::xmlns) == + (aNamespaceID == kNameSpaceID_XMLNS); + } + + // If the prefix is non-null then the namespace must not be null. + if (aNamespaceID == kNameSpaceID_None) { + return false; + } + + // If the namespace is the XMLNS namespace then the prefix must be xmlns, + // but the localname must not be xmlns. + if (aNamespaceID == kNameSpaceID_XMLNS) { + return aPrefix == nsGkAtoms::xmlns && aLocalName != nsGkAtoms::xmlns; + } + + // If the namespace is not the XMLNS namespace then the prefix must not be + // xmlns. + // If the namespace is the XML namespace then the prefix can be anything. + // If the namespace is not the XML namespace then the prefix must not be xml. + return aPrefix != nsGkAtoms::xmlns && + (aNamespaceID == kNameSpaceID_XML || aPrefix != nsGkAtoms::xml); +} + +already_AddRefed<DocumentFragment> nsContentUtils::CreateContextualFragment( + nsINode* aContextNode, const nsAString& aFragment, + bool aPreventScriptExecution, ErrorResult& aRv) { + if (!aContextNode) { + aRv.Throw(NS_ERROR_INVALID_ARG); + return nullptr; + } + + // If we don't have a document here, we can't get the right security context + // for compiling event handlers... so just bail out. + RefPtr<Document> document = aContextNode->OwnerDoc(); + bool isHTML = document->IsHTMLDocument(); + + if (isHTML) { + RefPtr<DocumentFragment> frag = new (document->NodeInfoManager()) + DocumentFragment(document->NodeInfoManager()); + + Element* element = aContextNode->GetAsElementOrParentElement(); + if (element && !element->IsHTMLElement(nsGkAtoms::html)) { + aRv = ParseFragmentHTML( + aFragment, frag, element->NodeInfo()->NameAtom(), + element->GetNameSpaceID(), + (document->GetCompatibilityMode() == eCompatibility_NavQuirks), + aPreventScriptExecution); + } else { + aRv = ParseFragmentHTML( + aFragment, frag, nsGkAtoms::body, kNameSpaceID_XHTML, + (document->GetCompatibilityMode() == eCompatibility_NavQuirks), + aPreventScriptExecution); + } + + return frag.forget(); + } + + AutoTArray<nsString, 32> tagStack; + nsAutoString uriStr, nameStr; + for (Element* element : aContextNode->InclusiveAncestorsOfType<Element>()) { + nsString& tagName = *tagStack.AppendElement(); + // It mostly doesn't actually matter what tag name we use here: XML doesn't + // have parsing that depends on the open tag stack, apart from namespace + // declarations. So this whole tagStack bit is just there to get the right + // namespace declarations to the XML parser. That said, the parser _is_ + // going to create elements with the tag names we provide here, so we need + // to make sure they are not names that can trigger custom element + // constructors. Just make up a name that is never going to be a valid + // custom element name. + // + // The principled way to do this would probably be to add a new FromParser + // value and make sure we use it when creating the context elements, then + // make sure we teach all FromParser consumers (and in particular the custom + // element code) about it as needed. But right now the XML parser never + // actually uses FromParser values other than NOT_FROM_PARSER, and changing + // that is pretty complicated. + tagName.AssignLiteral("notacustomelement"); + + // see if we need to add xmlns declarations + uint32_t count = element->GetAttrCount(); + bool setDefaultNamespace = false; + if (count > 0) { + uint32_t index; + + for (index = 0; index < count; index++) { + const BorrowedAttrInfo info = element->GetAttrInfoAt(index); + const nsAttrName* name = info.mName; + if (name->NamespaceEquals(kNameSpaceID_XMLNS)) { + info.mValue->ToString(uriStr); + + // really want something like nsXMLContentSerializer::SerializeAttr + tagName.AppendLiteral(" xmlns"); // space important + if (name->GetPrefix()) { + tagName.Append(char16_t(':')); + name->LocalName()->ToString(nameStr); + tagName.Append(nameStr); + } else { + setDefaultNamespace = true; + } + tagName.AppendLiteral(R"(=")"); + tagName.Append(uriStr); + tagName.Append('"'); + } + } + } + + if (!setDefaultNamespace) { + mozilla::dom::NodeInfo* info = element->NodeInfo(); + if (!info->GetPrefixAtom() && info->NamespaceID() != kNameSpaceID_None) { + // We have no namespace prefix, but have a namespace ID. Push + // default namespace attr in, so that our kids will be in our + // namespace. + info->GetNamespaceURI(uriStr); + tagName.AppendLiteral(R"( xmlns=")"); + tagName.Append(uriStr); + tagName.Append('"'); + } + } + } + + RefPtr<DocumentFragment> frag; + aRv = ParseFragmentXML(aFragment, document, tagStack, aPreventScriptExecution, + -1, getter_AddRefs(frag)); + return frag.forget(); +} + +/* static */ +void nsContentUtils::DropFragmentParsers() { + NS_IF_RELEASE(sHTMLFragmentParser); + NS_IF_RELEASE(sXMLFragmentParser); + NS_IF_RELEASE(sXMLFragmentSink); +} + +/* static */ +void nsContentUtils::XPCOMShutdown() { nsContentUtils::DropFragmentParsers(); } + +/* Helper function to compuate Sanitization Flags for ParseFramentHTML/XML */ +uint32_t computeSanitizationFlags(nsIPrincipal* aPrincipal, int32_t aFlags) { + uint32_t sanitizationFlags = 0; + if (aPrincipal->IsSystemPrincipal()) { + if (aFlags < 0) { + // if this is a chrome-privileged document and no explicit flags + // were passed, then use this sanitization flags. + sanitizationFlags = nsIParserUtils::SanitizerAllowStyle | + nsIParserUtils::SanitizerAllowComments | + nsIParserUtils::SanitizerDropForms | + nsIParserUtils::SanitizerLogRemovals; + } else { + // if the caller explicitly passes flags, then we use those + // flags but additionally drop forms. + sanitizationFlags = aFlags | nsIParserUtils::SanitizerDropForms; + } + } else if (aFlags >= 0) { + // aFlags by default is -1 and is only ever non equal to -1 if the + // caller of ParseFragmentHTML/ParseFragmentXML is + // ParserUtils::ParseFragment(). Only in that case we should use + // the sanitization flags passed within aFlags. + sanitizationFlags = aFlags; + } + return sanitizationFlags; +} + +/* static */ +bool AllowsUnsanitizedContentForAboutNewTab(nsIPrincipal* aPrincipal) { + if (StaticPrefs::dom_about_newtab_sanitization_enabled() || + !aPrincipal->SchemeIs("about")) { + return false; + } + uint32_t aboutModuleFlags = 0; + aPrincipal->GetAboutModuleFlags(&aboutModuleFlags); + return aboutModuleFlags & nsIAboutModule::ALLOW_UNSANITIZED_CONTENT; +} + +/* static */ +nsresult nsContentUtils::ParseFragmentHTML( + const nsAString& aSourceBuffer, nsIContent* aTargetNode, + nsAtom* aContextLocalName, int32_t aContextNamespace, bool aQuirks, + bool aPreventScriptExecution, int32_t aFlags) { + AutoTimelineMarker m(aTargetNode->OwnerDoc()->GetDocShell(), "Parse HTML"); + + if (nsContentUtils::sFragmentParsingActive) { + MOZ_ASSERT_UNREACHABLE("Re-entrant fragment parsing attempted."); + return NS_ERROR_DOM_INVALID_STATE_ERR; + } + mozilla::AutoRestore<bool> guard(nsContentUtils::sFragmentParsingActive); + nsContentUtils::sFragmentParsingActive = true; + if (!sHTMLFragmentParser) { + NS_ADDREF(sHTMLFragmentParser = new nsHtml5StringParser()); + // Now sHTMLFragmentParser owns the object + } + + nsCOMPtr<nsIPrincipal> nodePrincipal = aTargetNode->NodePrincipal(); + +#ifdef DEBUG + // aFlags should always be -1 unless the caller of ParseFragmentHTML + // is ParserUtils::ParseFragment() which is the only caller that intends + // sanitization. For all other callers we need to ensure to call + // AuditParsingOfHTMLXMLFragments. + if (aFlags < 0) { + DOMSecurityMonitor::AuditParsingOfHTMLXMLFragments(nodePrincipal, + aSourceBuffer); + } +#endif + + nsIContent* target = aTargetNode; + + RefPtr<Document> doc = aTargetNode->OwnerDoc(); + RefPtr<DocumentFragment> fragment; + // We sanitize if the fragment occurs in a system privileged + // context, an about: page, or if there are explicit sanitization flags. + // Please note that about:blank and about:srcdoc inherit the security + // context from the embedding context and hence are not loaded using + // an about: scheme principal. + bool shouldSanitize = nodePrincipal->IsSystemPrincipal() || + nodePrincipal->SchemeIs("about") || aFlags >= 0; + if (shouldSanitize && + !AllowsUnsanitizedContentForAboutNewTab(nodePrincipal)) { + if (!doc->IsLoadedAsData()) { + doc = nsContentUtils::CreateInertHTMLDocument(doc); + if (!doc) { + return NS_ERROR_FAILURE; + } + } + fragment = + new (doc->NodeInfoManager()) DocumentFragment(doc->NodeInfoManager()); + target = fragment; + } + + nsresult rv = sHTMLFragmentParser->ParseFragment( + aSourceBuffer, target, aContextLocalName, aContextNamespace, aQuirks, + aPreventScriptExecution); + NS_ENSURE_SUCCESS(rv, rv); + + if (fragment) { + uint32_t sanitizationFlags = + computeSanitizationFlags(nodePrincipal, aFlags); + // Don't fire mutation events for nodes removed by the sanitizer. + nsAutoScriptBlockerSuppressNodeRemoved scriptBlocker; + nsTreeSanitizer sanitizer(sanitizationFlags); + sanitizer.Sanitize(fragment); + + ErrorResult error; + aTargetNode->AppendChild(*fragment, error); + rv = error.StealNSResult(); + } + + return rv; +} + +/* static */ +nsresult nsContentUtils::ParseDocumentHTML( + const nsAString& aSourceBuffer, Document* aTargetDocument, + bool aScriptingEnabledForNoscriptParsing) { + AutoTimelineMarker m(aTargetDocument->GetDocShell(), "Parse HTML"); + + if (nsContentUtils::sFragmentParsingActive) { + MOZ_ASSERT_UNREACHABLE("Re-entrant fragment parsing attempted."); + return NS_ERROR_DOM_INVALID_STATE_ERR; + } + mozilla::AutoRestore<bool> guard(nsContentUtils::sFragmentParsingActive); + nsContentUtils::sFragmentParsingActive = true; + if (!sHTMLFragmentParser) { + NS_ADDREF(sHTMLFragmentParser = new nsHtml5StringParser()); + // Now sHTMLFragmentParser owns the object + } + nsresult rv = sHTMLFragmentParser->ParseDocument( + aSourceBuffer, aTargetDocument, aScriptingEnabledForNoscriptParsing); + return rv; +} + +/* static */ +nsresult nsContentUtils::ParseFragmentXML(const nsAString& aSourceBuffer, + Document* aDocument, + nsTArray<nsString>& aTagStack, + bool aPreventScriptExecution, + int32_t aFlags, + DocumentFragment** aReturn) { + AutoTimelineMarker m(aDocument->GetDocShell(), "Parse XML"); + + if (nsContentUtils::sFragmentParsingActive) { + MOZ_ASSERT_UNREACHABLE("Re-entrant fragment parsing attempted."); + return NS_ERROR_DOM_INVALID_STATE_ERR; + } + mozilla::AutoRestore<bool> guard(nsContentUtils::sFragmentParsingActive); + nsContentUtils::sFragmentParsingActive = true; + if (!sXMLFragmentParser) { + RefPtr<nsParser> parser = new nsParser(); + parser.forget(&sXMLFragmentParser); + // sXMLFragmentParser now owns the parser + } + if (!sXMLFragmentSink) { + NS_NewXMLFragmentContentSink(&sXMLFragmentSink); + // sXMLFragmentSink now owns the sink + } + nsCOMPtr<nsIContentSink> contentsink = do_QueryInterface(sXMLFragmentSink); + MOZ_ASSERT(contentsink, "Sink doesn't QI to nsIContentSink!"); + sXMLFragmentParser->SetContentSink(contentsink); + + RefPtr<Document> doc; + nsCOMPtr<nsIPrincipal> nodePrincipal = aDocument->NodePrincipal(); + +#ifdef DEBUG + // aFlags should always be -1 unless the caller of ParseFragmentXML + // is ParserUtils::ParseFragment() which is the only caller that intends + // sanitization. For all other callers we need to ensure to call + // AuditParsingOfHTMLXMLFragments. + if (aFlags < 0) { + DOMSecurityMonitor::AuditParsingOfHTMLXMLFragments(nodePrincipal, + aSourceBuffer); + } +#endif + + // We sanitize if the fragment occurs in a system privileged + // context, an about: page, or if there are explicit sanitization flags. + // Please note that about:blank and about:srcdoc inherit the security + // context from the embedding context and hence are not loaded using + // an about: scheme principal. + bool shouldSanitize = nodePrincipal->IsSystemPrincipal() || + nodePrincipal->SchemeIs("about") || aFlags >= 0; + if (shouldSanitize && !aDocument->IsLoadedAsData()) { + doc = nsContentUtils::CreateInertXMLDocument(aDocument); + } else { + doc = aDocument; + } + + sXMLFragmentSink->SetTargetDocument(doc); + sXMLFragmentSink->SetPreventScriptExecution(aPreventScriptExecution); + + nsresult rv = sXMLFragmentParser->ParseFragment(aSourceBuffer, aTagStack); + if (NS_FAILED(rv)) { + // Drop the fragment parser and sink that might be in an inconsistent state + NS_IF_RELEASE(sXMLFragmentParser); + NS_IF_RELEASE(sXMLFragmentSink); + return rv; + } + + rv = sXMLFragmentSink->FinishFragmentParsing(aReturn); + + sXMLFragmentParser->Reset(); + NS_ENSURE_SUCCESS(rv, rv); + + if (shouldSanitize) { + uint32_t sanitizationFlags = + computeSanitizationFlags(nodePrincipal, aFlags); + // Don't fire mutation events for nodes removed by the sanitizer. + nsAutoScriptBlockerSuppressNodeRemoved scriptBlocker; + nsTreeSanitizer sanitizer(sanitizationFlags); + sanitizer.Sanitize(*aReturn); + } + + return rv; +} + +/* static */ +nsresult nsContentUtils::ConvertToPlainText(const nsAString& aSourceBuffer, + nsAString& aResultBuffer, + uint32_t aFlags, + uint32_t aWrapCol) { + RefPtr<Document> document = nsContentUtils::CreateInertHTMLDocument(nullptr); + if (!document) { + return NS_ERROR_FAILURE; + } + + nsresult rv = nsContentUtils::ParseDocumentHTML( + aSourceBuffer, document, + !(aFlags & nsIDocumentEncoder::OutputNoScriptContent)); + NS_ENSURE_SUCCESS(rv, rv); + + nsCOMPtr<nsIDocumentEncoder> encoder = do_createDocumentEncoder("text/plain"); + + rv = encoder->Init(document, u"text/plain"_ns, aFlags); + NS_ENSURE_SUCCESS(rv, rv); + + encoder->SetWrapColumn(aWrapCol); + + return encoder->EncodeToString(aResultBuffer); +} + +static already_AddRefed<Document> CreateInertDocument(const Document* aTemplate, + DocumentFlavor aFlavor) { + if (aTemplate) { + bool hasHad = true; + nsIScriptGlobalObject* sgo = aTemplate->GetScriptHandlingObject(hasHad); + NS_ENSURE_TRUE(sgo || !hasHad, nullptr); + + nsCOMPtr<Document> doc; + nsresult rv = NS_NewDOMDocument( + getter_AddRefs(doc), u""_ns, u""_ns, nullptr, + aTemplate->GetDocumentURI(), aTemplate->GetDocBaseURI(), + aTemplate->NodePrincipal(), true, sgo, aFlavor); + if (NS_FAILED(rv)) { + return nullptr; + } + return doc.forget(); + } + nsCOMPtr<nsIURI> uri; + NS_NewURI(getter_AddRefs(uri), "about:blank"_ns); + if (!uri) { + return nullptr; + } + + RefPtr<NullPrincipal> nullPrincipal = + NullPrincipal::CreateWithoutOriginAttributes(); + if (!nullPrincipal) { + return nullptr; + } + + nsCOMPtr<Document> doc; + nsresult rv = + NS_NewDOMDocument(getter_AddRefs(doc), u""_ns, u""_ns, nullptr, uri, uri, + nullPrincipal, true, nullptr, aFlavor); + if (NS_FAILED(rv)) { + return nullptr; + } + return doc.forget(); +} + +/* static */ +already_AddRefed<Document> nsContentUtils::CreateInertXMLDocument( + const Document* aTemplate) { + return CreateInertDocument(aTemplate, DocumentFlavorXML); +} + +/* static */ +already_AddRefed<Document> nsContentUtils::CreateInertHTMLDocument( + const Document* aTemplate) { + return CreateInertDocument(aTemplate, DocumentFlavorHTML); +} + +/* static */ +nsresult nsContentUtils::SetNodeTextContent(nsIContent* aContent, + const nsAString& aValue, + bool aTryReuse) { + // Fire DOMNodeRemoved mutation events before we do anything else. + nsCOMPtr<nsIContent> owningContent; + + // Batch possible DOMSubtreeModified events. + mozAutoSubtreeModified subtree(nullptr, nullptr); + + // Scope firing mutation events so that we don't carry any state that + // might be stale + { + // We're relying on mozAutoSubtreeModified to keep a strong reference if + // needed. + Document* doc = aContent->OwnerDoc(); + + // Optimize the common case of there being no observers + if (HasMutationListeners(doc, NS_EVENT_BITS_MUTATION_NODEREMOVED)) { + subtree.UpdateTarget(doc, nullptr); + owningContent = aContent; + nsCOMPtr<nsINode> child; + bool skipFirst = aTryReuse; + for (child = aContent->GetFirstChild(); + child && child->GetParentNode() == aContent; + child = child->GetNextSibling()) { + if (skipFirst && child->IsText()) { + skipFirst = false; + continue; + } + nsContentUtils::MaybeFireNodeRemoved(child, aContent); + } + } + } + + // Might as well stick a batch around this since we're performing several + // mutations. + mozAutoDocUpdate updateBatch(aContent->GetComposedDoc(), true); + nsAutoMutationBatch mb; + + if (aTryReuse && !aValue.IsEmpty()) { + // Let's remove nodes until we find a eTEXT. + while (aContent->HasChildren()) { + nsIContent* child = aContent->GetFirstChild(); + if (child->IsText()) { + break; + } + aContent->RemoveChildNode(child, true); + } + + // If we have a node, it must be a eTEXT and we reuse it. + if (aContent->HasChildren()) { + nsIContent* child = aContent->GetFirstChild(); + nsresult rv = child->AsText()->SetText(aValue, true); + NS_ENSURE_SUCCESS(rv, rv); + + // All the following nodes, if they exist, must be deleted. + while (nsIContent* nextChild = child->GetNextSibling()) { + aContent->RemoveChildNode(nextChild, true); + } + } + + if (aContent->HasChildren()) { + return NS_OK; + } + } else { + mb.Init(aContent, true, false); + while (aContent->HasChildren()) { + aContent->RemoveChildNode(aContent->GetFirstChild(), true); + } + } + mb.RemovalDone(); + + if (aValue.IsEmpty()) { + return NS_OK; + } + + RefPtr<nsTextNode> textContent = new (aContent->NodeInfo()->NodeInfoManager()) + nsTextNode(aContent->NodeInfo()->NodeInfoManager()); + + textContent->SetText(aValue, true); + + ErrorResult rv; + aContent->AppendChildTo(textContent, true, rv); + mb.NodesAdded(); + return rv.StealNSResult(); +} + +static bool AppendNodeTextContentsRecurse(const nsINode* aNode, + nsAString& aResult, + const fallible_t& aFallible) { + for (nsIContent* child = aNode->GetFirstChild(); child; + child = child->GetNextSibling()) { + if (child->IsElement()) { + bool ok = AppendNodeTextContentsRecurse(child, aResult, aFallible); + if (!ok) { + return false; + } + } else if (Text* text = child->GetAsText()) { + bool ok = text->AppendTextTo(aResult, aFallible); + if (!ok) { + return false; + } + } + } + + return true; +} + +/* static */ +bool nsContentUtils::AppendNodeTextContent(const nsINode* aNode, bool aDeep, + nsAString& aResult, + const fallible_t& aFallible) { + if (const Text* text = aNode->GetAsText()) { + return text->AppendTextTo(aResult, aFallible); + } + if (aDeep) { + return AppendNodeTextContentsRecurse(aNode, aResult, aFallible); + } + + for (nsIContent* child = aNode->GetFirstChild(); child; + child = child->GetNextSibling()) { + if (Text* text = child->GetAsText()) { + bool ok = text->AppendTextTo(aResult, fallible); + if (!ok) { + return false; + } + } + } + return true; +} + +bool nsContentUtils::HasNonEmptyTextContent( + nsINode* aNode, TextContentDiscoverMode aDiscoverMode) { + for (nsIContent* child = aNode->GetFirstChild(); child; + child = child->GetNextSibling()) { + if (child->IsText() && child->TextLength() > 0) { + return true; + } + + if (aDiscoverMode == eRecurseIntoChildren && + HasNonEmptyTextContent(child, aDiscoverMode)) { + return true; + } + } + + return false; +} + +/* static */ +bool nsContentUtils::IsInSameAnonymousTree(const nsINode* aNode, + const nsINode* aOtherNode) { + MOZ_ASSERT(aNode, "Must have a node to work with"); + MOZ_ASSERT(aOtherNode, "Must have a content to work with"); + + const bool anon = aNode->IsInNativeAnonymousSubtree(); + if (anon != aOtherNode->IsInNativeAnonymousSubtree()) { + return false; + } + + if (anon) { + return aOtherNode->GetClosestNativeAnonymousSubtreeRoot() == + aNode->GetClosestNativeAnonymousSubtreeRoot(); + } + + // FIXME: This doesn't deal with disconnected nodes whatsoever, but it didn't + // use to either. Maybe that's fine. + return aNode->GetContainingShadow() == aOtherNode->GetContainingShadow(); +} + +/* static */ +bool nsContentUtils::IsInInteractiveHTMLContent(const Element* aElement, + const Element* aStop) { + const Element* element = aElement; + while (element && element != aStop) { + if (element->IsInteractiveHTMLContent()) { + return true; + } + element = element->GetFlattenedTreeParentElement(); + } + return false; +} + +/* static */ +void nsContentUtils::NotifyInstalledMenuKeyboardListener(bool aInstalling) { + IMEStateManager::OnInstalledMenuKeyboardListener(aInstalling); +} + +/* static */ +bool nsContentUtils::SchemeIs(nsIURI* aURI, const char* aScheme) { + nsCOMPtr<nsIURI> baseURI = NS_GetInnermostURI(aURI); + NS_ENSURE_TRUE(baseURI, false); + return baseURI->SchemeIs(aScheme); +} + +bool nsContentUtils::IsExpandedPrincipal(nsIPrincipal* aPrincipal) { + return aPrincipal && aPrincipal->GetIsExpandedPrincipal(); +} + +bool nsContentUtils::IsSystemOrExpandedPrincipal(nsIPrincipal* aPrincipal) { + return (aPrincipal && aPrincipal->IsSystemPrincipal()) || + IsExpandedPrincipal(aPrincipal); +} + +nsIPrincipal* nsContentUtils::GetSystemPrincipal() { + MOZ_ASSERT(IsInitialized()); + return sSystemPrincipal; +} + +bool nsContentUtils::CombineResourcePrincipals( + nsCOMPtr<nsIPrincipal>* aResourcePrincipal, nsIPrincipal* aExtraPrincipal) { + if (!aExtraPrincipal) { + return false; + } + if (!*aResourcePrincipal) { + *aResourcePrincipal = aExtraPrincipal; + return true; + } + if (*aResourcePrincipal == aExtraPrincipal) { + return false; + } + bool subsumes; + if (NS_SUCCEEDED( + (*aResourcePrincipal)->Subsumes(aExtraPrincipal, &subsumes)) && + subsumes) { + return false; + } + *aResourcePrincipal = sSystemPrincipal; + return true; +} + +/* static */ +void nsContentUtils::TriggerLink(nsIContent* aContent, nsIURI* aLinkURI, + const nsString& aTargetSpec, bool aClick, + bool aIsTrusted) { + MOZ_ASSERT(aLinkURI, "No link URI"); + + if (aContent->IsEditable() || !aContent->OwnerDoc()->LinkHandlingEnabled()) { + return; + } + + nsCOMPtr<nsIDocShell> docShell = aContent->OwnerDoc()->GetDocShell(); + if (!docShell) { + return; + } + + if (!aClick) { + nsDocShell::Cast(docShell)->OnOverLink(aContent, aLinkURI, aTargetSpec); + return; + } + + // Check that this page is allowed to load this URI. + nsresult proceed = NS_OK; + + if (sSecurityManager) { + uint32_t flag = static_cast<uint32_t>(nsIScriptSecurityManager::STANDARD); + proceed = sSecurityManager->CheckLoadURIWithPrincipal( + aContent->NodePrincipal(), aLinkURI, flag, + aContent->OwnerDoc()->InnerWindowID()); + } + + // Only pass off the click event if the script security manager says it's ok. + // We need to rest aTargetSpec for forced downloads. + if (NS_SUCCEEDED(proceed)) { + // A link/area element with a download attribute is allowed to set + // a pseudo Content-Disposition header. + // For security reasons we only allow websites to declare same-origin + // resources as downloadable. If this check fails we will just do the normal + // thing (i.e. navigate to the resource). + nsAutoString fileName; + if ((!aContent->IsHTMLElement(nsGkAtoms::a) && + !aContent->IsHTMLElement(nsGkAtoms::area) && + !aContent->IsSVGElement(nsGkAtoms::a)) || + !aContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::download, + fileName) || + NS_FAILED(aContent->NodePrincipal()->CheckMayLoad(aLinkURI, true))) { + fileName.SetIsVoid(true); // No actionable download attribute was found. + } + + nsCOMPtr<nsIPrincipal> triggeringPrincipal = aContent->NodePrincipal(); + nsCOMPtr<nsIContentSecurityPolicy> csp = aContent->GetCsp(); + + // Sanitize fileNames containing null characters by replacing them with + // underscores. + if (!fileName.IsVoid()) { + fileName.ReplaceChar(char16_t(0), '_'); + } + nsDocShell::Cast(docShell)->OnLinkClick( + aContent, aLinkURI, fileName.IsVoid() ? aTargetSpec : u""_ns, fileName, + nullptr, nullptr, UserActivation::IsHandlingUserInput(), aIsTrusted, + triggeringPrincipal, csp); + } +} + +/* static */ +void nsContentUtils::GetLinkLocation(Element* aElement, + nsString& aLocationString) { + nsCOMPtr<nsIURI> hrefURI = aElement->GetHrefURI(); + if (hrefURI) { + nsAutoCString specUTF8; + nsresult rv = hrefURI->GetSpec(specUTF8); + if (NS_SUCCEEDED(rv)) CopyUTF8toUTF16(specUTF8, aLocationString); + } +} + +/* static */ +nsIWidget* nsContentUtils::GetTopLevelWidget(nsIWidget* aWidget) { + if (!aWidget) return nullptr; + + return aWidget->GetTopLevelWidget(); +} + +/* static */ +const nsDependentString nsContentUtils::GetLocalizedEllipsis() { + static char16_t sBuf[4] = {0, 0, 0, 0}; + if (!sBuf[0]) { + if (!SpoofLocaleEnglish()) { + nsAutoString tmp; + Preferences::GetLocalizedString("intl.ellipsis", tmp); + uint32_t len = + std::min(uint32_t(tmp.Length()), uint32_t(ArrayLength(sBuf) - 1)); + CopyUnicodeTo(tmp, 0, sBuf, len); + } + if (!sBuf[0]) sBuf[0] = char16_t(0x2026); + } + return nsDependentString(sBuf); +} + +/* static */ +void nsContentUtils::AddScriptBlocker() { + MOZ_ASSERT(NS_IsMainThread()); + if (!sScriptBlockerCount) { + MOZ_ASSERT(sRunnersCountAtFirstBlocker == 0, + "Should not already have a count"); + sRunnersCountAtFirstBlocker = + sBlockedScriptRunners ? sBlockedScriptRunners->Length() : 0; + } + ++sScriptBlockerCount; +} + +#ifdef DEBUG +static bool sRemovingScriptBlockers = false; +#endif + +/* static */ +void nsContentUtils::RemoveScriptBlocker() { + MOZ_ASSERT(NS_IsMainThread()); + MOZ_ASSERT(!sRemovingScriptBlockers); + NS_ASSERTION(sScriptBlockerCount != 0, "Negative script blockers"); + --sScriptBlockerCount; + if (sScriptBlockerCount) { + return; + } + + if (!sBlockedScriptRunners) { + return; + } + + uint32_t firstBlocker = sRunnersCountAtFirstBlocker; + uint32_t lastBlocker = sBlockedScriptRunners->Length(); + uint32_t originalFirstBlocker = firstBlocker; + uint32_t blockersCount = lastBlocker - firstBlocker; + sRunnersCountAtFirstBlocker = 0; + NS_ASSERTION(firstBlocker <= lastBlocker, "bad sRunnersCountAtFirstBlocker"); + + while (firstBlocker < lastBlocker) { + nsCOMPtr<nsIRunnable> runnable; + runnable.swap((*sBlockedScriptRunners)[firstBlocker]); + ++firstBlocker; + + // Calling the runnable can reenter us + { + AUTO_PROFILE_FOLLOWING_RUNNABLE(runnable); + runnable->Run(); + } + // So can dropping the reference to the runnable + runnable = nullptr; + + NS_ASSERTION(sRunnersCountAtFirstBlocker == 0, "Bad count"); + NS_ASSERTION(!sScriptBlockerCount, "This is really bad"); + } +#ifdef DEBUG + AutoRestore<bool> removingScriptBlockers(sRemovingScriptBlockers); + sRemovingScriptBlockers = true; +#endif + sBlockedScriptRunners->RemoveElementsAt(originalFirstBlocker, blockersCount); +} + +/* static */ +already_AddRefed<nsPIDOMWindowOuter> +nsContentUtils::GetMostRecentNonPBWindow() { + nsCOMPtr<nsIWindowMediator> wm = do_GetService(NS_WINDOWMEDIATOR_CONTRACTID); + + nsCOMPtr<mozIDOMWindowProxy> window; + wm->GetMostRecentNonPBWindow(u"navigator:browser", getter_AddRefs(window)); + nsCOMPtr<nsPIDOMWindowOuter> pwindow; + pwindow = do_QueryInterface(window); + + return pwindow.forget(); +} + +/* static */ +void nsContentUtils::WarnScriptWasIgnored(Document* aDocument) { + nsAutoString msg; + bool privateBrowsing = false; + bool chromeContext = false; + + if (aDocument) { + nsCOMPtr<nsIURI> uri = aDocument->GetDocumentURI(); + if (uri) { + msg.Append(NS_ConvertUTF8toUTF16(uri->GetSpecOrDefault())); + msg.AppendLiteral(" : "); + } + privateBrowsing = + !!aDocument->NodePrincipal()->OriginAttributesRef().mPrivateBrowsingId; + chromeContext = aDocument->NodePrincipal()->IsSystemPrincipal(); + } + + msg.AppendLiteral( + "Unable to run script because scripts are blocked internally."); + LogSimpleConsoleError(msg, "DOM"_ns, privateBrowsing, chromeContext); +} + +/* static */ +void nsContentUtils::AddScriptRunner(already_AddRefed<nsIRunnable> aRunnable) { + nsCOMPtr<nsIRunnable> runnable = aRunnable; + if (!runnable) { + return; + } + + if (sScriptBlockerCount) { + sBlockedScriptRunners->AppendElement(runnable.forget()); + return; + } + + AUTO_PROFILE_FOLLOWING_RUNNABLE(runnable); + runnable->Run(); +} + +/* static */ +void nsContentUtils::AddScriptRunner(nsIRunnable* aRunnable) { + nsCOMPtr<nsIRunnable> runnable = aRunnable; + AddScriptRunner(runnable.forget()); +} + +/* static */ bool nsContentUtils::IsSafeToRunScript() { + MOZ_ASSERT(NS_IsMainThread(), + "This static variable only makes sense on the main thread!"); + return sScriptBlockerCount == 0; +} + +/* static */ +void nsContentUtils::RunInStableState(already_AddRefed<nsIRunnable> aRunnable) { + MOZ_ASSERT(CycleCollectedJSContext::Get(), "Must be on a script thread!"); + CycleCollectedJSContext::Get()->RunInStableState(std::move(aRunnable)); +} + +/* static */ +void nsContentUtils::AddPendingIDBTransaction( + already_AddRefed<nsIRunnable> aTransaction) { + MOZ_ASSERT(CycleCollectedJSContext::Get(), "Must be on a script thread!"); + CycleCollectedJSContext::Get()->AddPendingIDBTransaction( + std::move(aTransaction)); +} + +/* static */ +bool nsContentUtils::IsInStableOrMetaStableState() { + MOZ_ASSERT(CycleCollectedJSContext::Get(), "Must be on a script thread!"); + return CycleCollectedJSContext::Get()->IsInStableOrMetaStableState(); +} + +/* static */ +void nsContentUtils::HidePopupsInDocument(Document* aDocument) { + RefPtr<nsXULPopupManager> pm = nsXULPopupManager::GetInstance(); + if (!pm || !aDocument) { + return; + } + nsCOMPtr<nsIDocShellTreeItem> docShellToHide = aDocument->GetDocShell(); + if (docShellToHide) { + pm->HidePopupsInDocShell(docShellToHide); + } +} + +/* static */ +already_AddRefed<nsIDragSession> nsContentUtils::GetDragSession() { + nsCOMPtr<nsIDragSession> dragSession; + nsCOMPtr<nsIDragService> dragService = + do_GetService("@mozilla.org/widget/dragservice;1"); + if (dragService) dragService->GetCurrentSession(getter_AddRefs(dragSession)); + return dragSession.forget(); +} + +/* static */ +nsresult nsContentUtils::SetDataTransferInEvent(WidgetDragEvent* aDragEvent) { + if (aDragEvent->mDataTransfer || !aDragEvent->IsTrusted()) { + return NS_OK; + } + + // For dragstart events, the data transfer object is + // created before the event fires, so it should already be set. For other + // drag events, get the object from the drag session. + NS_ASSERTION(aDragEvent->mMessage != eDragStart, + "draggesture event created without a dataTransfer"); + + nsCOMPtr<nsIDragSession> dragSession = GetDragSession(); + NS_ENSURE_TRUE(dragSession, NS_OK); // no drag in progress + + RefPtr<DataTransfer> initialDataTransfer = dragSession->GetDataTransfer(); + if (!initialDataTransfer) { + // A dataTransfer won't exist when a drag was started by some other + // means, for instance calling the drag service directly, or a drag + // from another application. In either case, a new dataTransfer should + // be created that reflects the data. + initialDataTransfer = + new DataTransfer(aDragEvent->mTarget, aDragEvent->mMessage, true, -1); + + // now set it in the drag session so we don't need to create it again + dragSession->SetDataTransfer(initialDataTransfer); + } + + bool isCrossDomainSubFrameDrop = false; + if (aDragEvent->mMessage == eDrop) { + isCrossDomainSubFrameDrop = CheckForSubFrameDrop(dragSession, aDragEvent); + } + + // each event should use a clone of the original dataTransfer. + initialDataTransfer->Clone( + aDragEvent->mTarget, aDragEvent->mMessage, aDragEvent->mUserCancelled, + isCrossDomainSubFrameDrop, getter_AddRefs(aDragEvent->mDataTransfer)); + if (NS_WARN_IF(!aDragEvent->mDataTransfer)) { + return NS_ERROR_OUT_OF_MEMORY; + } + + // for the dragenter and dragover events, initialize the drop effect + // from the drop action, which platform specific widget code sets before + // the event is fired based on the keyboard state. + if (aDragEvent->mMessage == eDragEnter || aDragEvent->mMessage == eDragOver) { + uint32_t action; + dragSession->GetDragAction(&action); + uint32_t effectAllowed = aDragEvent->mDataTransfer->EffectAllowedInt(); + aDragEvent->mDataTransfer->SetDropEffectInt( + FilterDropEffect(action, effectAllowed)); + } else if (aDragEvent->mMessage == eDrop || + aDragEvent->mMessage == eDragEnd) { + // For the drop and dragend events, set the drop effect based on the + // last value that the dropEffect had. This will have been set in + // EventStateManager::PostHandleEvent for the last dragenter or + // dragover event. + aDragEvent->mDataTransfer->SetDropEffectInt( + initialDataTransfer->DropEffectInt()); + } + + return NS_OK; +} + +/* static */ +uint32_t nsContentUtils::FilterDropEffect(uint32_t aAction, + uint32_t aEffectAllowed) { + // It is possible for the drag action to include more than one action, but + // the widget code which sets the action from the keyboard state should only + // be including one. If multiple actions were set, we just consider them in + // the following order: + // copy, link, move + if (aAction & nsIDragService::DRAGDROP_ACTION_COPY) + aAction = nsIDragService::DRAGDROP_ACTION_COPY; + else if (aAction & nsIDragService::DRAGDROP_ACTION_LINK) + aAction = nsIDragService::DRAGDROP_ACTION_LINK; + else if (aAction & nsIDragService::DRAGDROP_ACTION_MOVE) + aAction = nsIDragService::DRAGDROP_ACTION_MOVE; + + // Filter the action based on the effectAllowed. If the effectAllowed + // doesn't include the action, then that action cannot be done, so adjust + // the action to something that is allowed. For a copy, adjust to move or + // link. For a move, adjust to copy or link. For a link, adjust to move or + // link. Otherwise, use none. + if (aAction & aEffectAllowed || + aEffectAllowed == nsIDragService::DRAGDROP_ACTION_UNINITIALIZED) + return aAction; + if (aEffectAllowed & nsIDragService::DRAGDROP_ACTION_MOVE) + return nsIDragService::DRAGDROP_ACTION_MOVE; + if (aEffectAllowed & nsIDragService::DRAGDROP_ACTION_COPY) + return nsIDragService::DRAGDROP_ACTION_COPY; + if (aEffectAllowed & nsIDragService::DRAGDROP_ACTION_LINK) + return nsIDragService::DRAGDROP_ACTION_LINK; + return nsIDragService::DRAGDROP_ACTION_NONE; +} + +/* static */ +bool nsContentUtils::CheckForSubFrameDrop(nsIDragSession* aDragSession, + WidgetDragEvent* aDropEvent) { + nsCOMPtr<nsIContent> target = + nsIContent::FromEventTargetOrNull(aDropEvent->mOriginalTarget); + if (!target) { + return true; + } + + // Always allow dropping onto chrome shells. + BrowsingContext* targetBC = target->OwnerDoc()->GetBrowsingContext(); + if (targetBC->IsChrome()) { + return false; + } + + WindowContext* targetWC = target->OwnerDoc()->GetWindowContext(); + + // If there is no source browsing context, then this is a drag from another + // application, which should be allowed. + RefPtr<WindowContext> sourceWC; + aDragSession->GetSourceWindowContext(getter_AddRefs(sourceWC)); + if (sourceWC) { + // Get each successive parent of the source document and compare it to + // the drop document. If they match, then this is a drag from a child frame. + for (sourceWC = sourceWC->GetParentWindowContext(); sourceWC; + sourceWC = sourceWC->GetParentWindowContext()) { + // If the source and the target match, then the drag started in a + // descendant frame. If the source is discarded, err on the side of + // caution and treat it as a subframe drag. + if (sourceWC == targetWC || sourceWC->IsDiscarded()) { + return true; + } + } + } + + return false; +} + +/* static */ +bool nsContentUtils::URIIsLocalFile(nsIURI* aURI) { + bool isFile; + nsCOMPtr<nsINetUtil> util = mozilla::components::IO::Service(); + + // Important: we do NOT test the entire URI chain here! + return util && + NS_SUCCEEDED(util->ProtocolHasFlags( + aURI, nsIProtocolHandler::URI_IS_LOCAL_FILE, &isFile)) && + isFile; +} + +/* static */ +JSContext* nsContentUtils::GetCurrentJSContext() { + MOZ_ASSERT(IsInitialized()); + if (!IsJSAPIActive()) { + return nullptr; + } + return danger::GetJSContext(); +} + +template <typename StringType, typename CharType> +void _ASCIIToLowerInSitu(StringType& aStr) { + CharType* iter = aStr.BeginWriting(); + CharType* end = aStr.EndWriting(); + MOZ_ASSERT(iter && end); + + while (iter != end) { + CharType c = *iter; + if (c >= 'A' && c <= 'Z') { + *iter = c + ('a' - 'A'); + } + ++iter; + } +} + +/* static */ +void nsContentUtils::ASCIIToLower(nsAString& aStr) { + return _ASCIIToLowerInSitu<nsAString, char16_t>(aStr); +} + +/* static */ +void nsContentUtils::ASCIIToLower(nsACString& aStr) { + return _ASCIIToLowerInSitu<nsACString, char>(aStr); +} + +template <typename StringType, typename CharType> +void _ASCIIToLowerCopy(const StringType& aSource, StringType& aDest) { + uint32_t len = aSource.Length(); + aDest.SetLength(len); + MOZ_ASSERT(aDest.Length() == len); + + CharType* dest = aDest.BeginWriting(); + MOZ_ASSERT(dest); + + const CharType* iter = aSource.BeginReading(); + const CharType* end = aSource.EndReading(); + while (iter != end) { + CharType c = *iter; + *dest = (c >= 'A' && c <= 'Z') ? c + ('a' - 'A') : c; + ++iter; + ++dest; + } +} + +/* static */ +void nsContentUtils::ASCIIToLower(const nsAString& aSource, nsAString& aDest) { + return _ASCIIToLowerCopy<nsAString, char16_t>(aSource, aDest); +} + +/* static */ +void nsContentUtils::ASCIIToLower(const nsACString& aSource, + nsACString& aDest) { + return _ASCIIToLowerCopy<nsACString, char>(aSource, aDest); +} + +template <typename StringType, typename CharType> +void _ASCIIToUpperInSitu(StringType& aStr) { + CharType* iter = aStr.BeginWriting(); + CharType* end = aStr.EndWriting(); + MOZ_ASSERT(iter && end); + + while (iter != end) { + CharType c = *iter; + if (c >= 'a' && c <= 'z') { + *iter = c + ('A' - 'a'); + } + ++iter; + } +} + +/* static */ +void nsContentUtils::ASCIIToUpper(nsAString& aStr) { + return _ASCIIToUpperInSitu<nsAString, char16_t>(aStr); +} + +/* static */ +void nsContentUtils::ASCIIToUpper(nsACString& aStr) { + return _ASCIIToUpperInSitu<nsACString, char>(aStr); +} + +template <typename StringType, typename CharType> +void _ASCIIToUpperCopy(const StringType& aSource, StringType& aDest) { + uint32_t len = aSource.Length(); + aDest.SetLength(len); + MOZ_ASSERT(aDest.Length() == len); + + CharType* dest = aDest.BeginWriting(); + MOZ_ASSERT(dest); + + const CharType* iter = aSource.BeginReading(); + const CharType* end = aSource.EndReading(); + while (iter != end) { + CharType c = *iter; + *dest = (c >= 'a' && c <= 'z') ? c + ('A' - 'a') : c; + ++iter; + ++dest; + } +} + +/* static */ +void nsContentUtils::ASCIIToUpper(const nsAString& aSource, nsAString& aDest) { + return _ASCIIToUpperCopy<nsAString, char16_t>(aSource, aDest); +} + +/* static */ +void nsContentUtils::ASCIIToUpper(const nsACString& aSource, + nsACString& aDest) { + return _ASCIIToUpperCopy<nsACString, char>(aSource, aDest); +} + +/* static */ +bool nsContentUtils::EqualsIgnoreASCIICase(nsAtom* aAtom1, nsAtom* aAtom2) { + if (aAtom1 == aAtom2) { + return true; + } + + // If both are ascii lowercase already, we know that the slow comparison + // below is going to return false. + if (aAtom1->IsAsciiLowercase() && aAtom2->IsAsciiLowercase()) { + return false; + } + + return EqualsIgnoreASCIICase(nsDependentAtomString(aAtom1), + nsDependentAtomString(aAtom2)); +} + +/* static */ +bool nsContentUtils::EqualsIgnoreASCIICase(const nsAString& aStr1, + const nsAString& aStr2) { + uint32_t len = aStr1.Length(); + if (len != aStr2.Length()) { + return false; + } + + const char16_t* str1 = aStr1.BeginReading(); + const char16_t* str2 = aStr2.BeginReading(); + const char16_t* end = str1 + len; + + while (str1 < end) { + char16_t c1 = *str1++; + char16_t c2 = *str2++; + + // First check if any bits other than the 0x0020 differs + if ((c1 ^ c2) & 0xffdf) { + return false; + } + + // We know they can only differ in the 0x0020 bit. + // Likely the two chars are the same, so check that first + if (c1 != c2) { + // They do differ, but since it's only in the 0x0020 bit, check if it's + // the same ascii char, but just differing in case + char16_t c1Upper = c1 & 0xffdf; + if (!('A' <= c1Upper && c1Upper <= 'Z')) { + return false; + } + } + } + + return true; +} + +/* static */ +bool nsContentUtils::StringContainsASCIIUpper(const nsAString& aStr) { + const char16_t* iter = aStr.BeginReading(); + const char16_t* end = aStr.EndReading(); + while (iter != end) { + char16_t c = *iter; + if (c >= 'A' && c <= 'Z') { + return true; + } + ++iter; + } + + return false; +} + +/* static */ +nsIInterfaceRequestor* nsContentUtils::SameOriginChecker() { + if (!sSameOriginChecker) { + sSameOriginChecker = new SameOriginCheckerImpl(); + NS_ADDREF(sSameOriginChecker); + } + return sSameOriginChecker; +} + +/* static */ +nsresult nsContentUtils::CheckSameOrigin(nsIChannel* aOldChannel, + nsIChannel* aNewChannel) { + if (!nsContentUtils::GetSecurityManager()) return NS_ERROR_NOT_AVAILABLE; + + nsCOMPtr<nsIPrincipal> oldPrincipal; + nsContentUtils::GetSecurityManager()->GetChannelResultPrincipal( + aOldChannel, getter_AddRefs(oldPrincipal)); + + nsCOMPtr<nsIURI> newURI; + aNewChannel->GetURI(getter_AddRefs(newURI)); + nsCOMPtr<nsIURI> newOriginalURI; + aNewChannel->GetOriginalURI(getter_AddRefs(newOriginalURI)); + + NS_ENSURE_STATE(oldPrincipal && newURI && newOriginalURI); + + nsresult rv = oldPrincipal->CheckMayLoad(newURI, false); + if (NS_SUCCEEDED(rv) && newOriginalURI != newURI) { + rv = oldPrincipal->CheckMayLoad(newOriginalURI, false); + } + + return rv; +} + +NS_IMPL_ISUPPORTS(SameOriginCheckerImpl, nsIChannelEventSink, + nsIInterfaceRequestor) + +NS_IMETHODIMP +SameOriginCheckerImpl::AsyncOnChannelRedirect( + nsIChannel* aOldChannel, nsIChannel* aNewChannel, uint32_t aFlags, + nsIAsyncVerifyRedirectCallback* cb) { + MOZ_ASSERT(aNewChannel, "Redirecting to null channel?"); + + nsresult rv = nsContentUtils::CheckSameOrigin(aOldChannel, aNewChannel); + if (NS_SUCCEEDED(rv)) { + cb->OnRedirectVerifyCallback(NS_OK); + } + + return rv; +} + +NS_IMETHODIMP +SameOriginCheckerImpl::GetInterface(const nsIID& aIID, void** aResult) { + return QueryInterface(aIID, aResult); +} + +/* static */ +nsresult nsContentUtils::GetASCIIOrigin(nsIURI* aURI, nsACString& aOrigin) { + MOZ_ASSERT(aURI, "missing uri"); + + // For Blob URI, the path is the URL of the owning page. + if (aURI->SchemeIs(BLOBURI_SCHEME)) { + nsAutoCString path; + nsresult rv = aURI->GetPathQueryRef(path); + NS_ENSURE_SUCCESS(rv, rv); + + nsCOMPtr<nsIURI> uri; + rv = NS_NewURI(getter_AddRefs(uri), path); + if (NS_FAILED(rv)) { + aOrigin.AssignLiteral("null"); + return NS_OK; + } + + return GetASCIIOrigin(uri, aOrigin); + } + + aOrigin.Truncate(); + + nsCOMPtr<nsIURI> uri = NS_GetInnermostURI(aURI); + NS_ENSURE_TRUE(uri, NS_ERROR_UNEXPECTED); + + nsAutoCString host; + nsresult rv = uri->GetAsciiHost(host); + + if (NS_SUCCEEDED(rv) && !host.IsEmpty()) { + nsAutoCString userPass; + uri->GetUserPass(userPass); + + nsAutoCString prePath; + if (!userPass.IsEmpty()) { + rv = NS_MutateURI(uri).SetUserPass(""_ns).Finalize(uri); + NS_ENSURE_SUCCESS(rv, rv); + } + + rv = uri->GetPrePath(prePath); + NS_ENSURE_SUCCESS(rv, rv); + + aOrigin = prePath; + } else { + aOrigin.AssignLiteral("null"); + } + + return NS_OK; +} + +/* static */ +nsresult nsContentUtils::GetUTFOrigin(nsIPrincipal* aPrincipal, + nsAString& aOrigin) { + MOZ_ASSERT(aPrincipal, "missing principal"); + + aOrigin.Truncate(); + nsAutoCString asciiOrigin; + + nsresult rv = aPrincipal->GetAsciiOrigin(asciiOrigin); + if (NS_FAILED(rv)) { + asciiOrigin.AssignLiteral("null"); + } + + CopyUTF8toUTF16(asciiOrigin, aOrigin); + return NS_OK; +} + +/* static */ +nsresult nsContentUtils::GetUTFOrigin(nsIURI* aURI, nsAString& aOrigin) { + MOZ_ASSERT(aURI, "missing uri"); + nsresult rv; + +#if defined(MOZ_THUNDERBIRD) || defined(MOZ_SUITE) + // Check if either URI has a special origin. + nsCOMPtr<nsIURIWithSpecialOrigin> uriWithSpecialOrigin = + do_QueryInterface(aURI); + if (uriWithSpecialOrigin) { + nsCOMPtr<nsIURI> origin; + rv = uriWithSpecialOrigin->GetOrigin(getter_AddRefs(origin)); + NS_ENSURE_SUCCESS(rv, rv); + + return GetUTFOrigin(origin, aOrigin); + } +#endif + + nsAutoCString asciiOrigin; + rv = GetASCIIOrigin(aURI, asciiOrigin); + NS_ENSURE_SUCCESS(rv, rv); + + CopyUTF8toUTF16(asciiOrigin, aOrigin); + return NS_OK; +} + +/* static */ +bool nsContentUtils::CheckMayLoad(nsIPrincipal* aPrincipal, + nsIChannel* aChannel, + bool aAllowIfInheritsPrincipal) { + nsCOMPtr<nsIURI> channelURI; + nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(channelURI)); + NS_ENSURE_SUCCESS(rv, false); + + return NS_SUCCEEDED( + aPrincipal->CheckMayLoad(channelURI, aAllowIfInheritsPrincipal)); +} + +/* static */ +bool nsContentUtils::CanAccessNativeAnon() { + return LegacyIsCallerChromeOrNativeCode(); +} + +/* static */ +nsresult nsContentUtils::DispatchXULCommand(nsIContent* aTarget, bool aTrusted, + Event* aSourceEvent, + PresShell* aPresShell, bool aCtrl, + bool aAlt, bool aShift, bool aMeta, + uint16_t aInputSource, + int16_t aButton) { + NS_ENSURE_STATE(aTarget); + Document* doc = aTarget->OwnerDoc(); + nsPresContext* presContext = doc->GetPresContext(); + + RefPtr<XULCommandEvent> xulCommand = + new XULCommandEvent(doc, presContext, nullptr); + xulCommand->InitCommandEvent(u"command"_ns, true, true, + nsGlobalWindowInner::Cast(doc->GetInnerWindow()), + 0, aCtrl, aAlt, aShift, aMeta, aButton, + aSourceEvent, aInputSource, IgnoreErrors()); + + if (aPresShell) { + nsEventStatus status = nsEventStatus_eIgnore; + return aPresShell->HandleDOMEventWithTarget(aTarget, xulCommand, &status); + } + + ErrorResult rv; + aTarget->DispatchEvent(*xulCommand, rv); + return rv.StealNSResult(); +} + +// static +nsresult nsContentUtils::WrapNative(JSContext* cx, nsISupports* native, + nsWrapperCache* cache, const nsIID* aIID, + JS::MutableHandle<JS::Value> vp, + bool aAllowWrapping) { + MOZ_ASSERT(cx == GetCurrentJSContext()); + + if (!native) { + vp.setNull(); + + return NS_OK; + } + + JSObject* wrapper = xpc_FastGetCachedWrapper(cx, cache, vp); + if (wrapper) { + return NS_OK; + } + + NS_ENSURE_TRUE(sXPConnect, NS_ERROR_UNEXPECTED); + + if (!NS_IsMainThread()) { + MOZ_CRASH(); + } + + JS::Rooted<JSObject*> scope(cx, JS::CurrentGlobalOrNull(cx)); + nsresult rv = sXPConnect->WrapNativeToJSVal(cx, scope, native, cache, aIID, + aAllowWrapping, vp); + return rv; +} + +nsresult nsContentUtils::CreateArrayBuffer(JSContext* aCx, + const nsACString& aData, + JSObject** aResult) { + if (!aCx) { + return NS_ERROR_FAILURE; + } + + size_t dataLen = aData.Length(); + *aResult = JS::NewArrayBuffer(aCx, dataLen); + if (!*aResult) { + return NS_ERROR_FAILURE; + } + + if (dataLen > 0) { + NS_ASSERTION(JS::IsArrayBufferObject(*aResult), "What happened?"); + JS::AutoCheckCannotGC nogc; + bool isShared; + memcpy(JS::GetArrayBufferData(*aResult, &isShared, nogc), + aData.BeginReading(), dataLen); + MOZ_ASSERT(!isShared); + } + + return NS_OK; +} + +void nsContentUtils::StripNullChars(const nsAString& aInStr, + nsAString& aOutStr) { + // In common cases where we don't have nulls in the + // string we can simple simply bypass the checking code. + int32_t firstNullPos = aInStr.FindChar('\0'); + if (firstNullPos == kNotFound) { + aOutStr.Assign(aInStr); + return; + } + + aOutStr.SetCapacity(aInStr.Length() - 1); + nsAString::const_iterator start, end; + aInStr.BeginReading(start); + aInStr.EndReading(end); + while (start != end) { + if (*start != '\0') aOutStr.Append(*start); + ++start; + } +} + +struct ClassMatchingInfo { + AtomArray mClasses; + nsCaseTreatment mCaseTreatment; +}; + +// static +bool nsContentUtils::MatchClassNames(Element* aElement, int32_t aNamespaceID, + nsAtom* aAtom, void* aData) { + // We can't match if there are no class names + const nsAttrValue* classAttr = aElement->GetClasses(); + if (!classAttr) { + return false; + } + + // need to match *all* of the classes + ClassMatchingInfo* info = static_cast<ClassMatchingInfo*>(aData); + uint32_t length = info->mClasses.Length(); + if (!length) { + // If we actually had no classes, don't match. + return false; + } + uint32_t i; + for (i = 0; i < length; ++i) { + if (!classAttr->Contains(info->mClasses[i], info->mCaseTreatment)) { + return false; + } + } + + return true; +} + +// static +void nsContentUtils::DestroyClassNameArray(void* aData) { + ClassMatchingInfo* info = static_cast<ClassMatchingInfo*>(aData); + delete info; +} + +// static +void* nsContentUtils::AllocClassMatchingInfo(nsINode* aRootNode, + const nsString* aClasses) { + nsAttrValue attrValue; + attrValue.ParseAtomArray(*aClasses); + // nsAttrValue::Equals is sensitive to order, so we'll send an array + auto* info = new ClassMatchingInfo; + if (attrValue.Type() == nsAttrValue::eAtomArray) { + info->mClasses = std::move(attrValue.GetAtomArrayValue()->mArray); + } else if (attrValue.Type() == nsAttrValue::eAtom) { + info->mClasses.AppendElement(attrValue.GetAtomValue()); + } + + info->mCaseTreatment = + aRootNode->OwnerDoc()->GetCompatibilityMode() == eCompatibility_NavQuirks + ? eIgnoreCase + : eCaseMatters; + return info; +} + +// static +bool nsContentUtils::IsFocusedContent(const nsIContent* aContent) { + nsFocusManager* fm = nsFocusManager::GetFocusManager(); + + return fm && fm->GetFocusedElement() == aContent; +} + +bool nsContentUtils::HasScrollgrab(nsIContent* aContent) { + // If we ever standardize this feature we'll want to hook this up properly + // again. For now we're removing all the DOM-side code related to it but + // leaving the layout and APZ handling for it in place. + return false; +} + +void nsContentUtils::FlushLayoutForTree(nsPIDOMWindowOuter* aWindow) { + if (!aWindow) { + return; + } + + // Note that because FlushPendingNotifications flushes parents, this + // is O(N^2) in docshell tree depth. However, the docshell tree is + // usually pretty shallow. + + if (RefPtr<Document> doc = aWindow->GetDoc()) { + doc->FlushPendingNotifications(FlushType::Layout); + } + + if (nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell()) { + int32_t i = 0, i_end; + docShell->GetInProcessChildCount(&i_end); + for (; i < i_end; ++i) { + nsCOMPtr<nsIDocShellTreeItem> item; + if (docShell->GetInProcessChildAt(i, getter_AddRefs(item)) == NS_OK && + item) { + if (nsCOMPtr<nsPIDOMWindowOuter> win = item->GetWindow()) { + FlushLayoutForTree(win); + } + } + } + } +} + +void nsContentUtils::RemoveNewlines(nsString& aString) { aString.StripCRLF(); } + +void nsContentUtils::PlatformToDOMLineBreaks(nsString& aString) { + if (!PlatformToDOMLineBreaks(aString, fallible)) { + aString.AllocFailed(aString.Length()); + } +} + +bool nsContentUtils::PlatformToDOMLineBreaks(nsString& aString, + const fallible_t& aFallible) { + if (aString.FindChar(char16_t('\r')) != -1) { + // Windows linebreaks: Map CRLF to LF: + if (!aString.ReplaceSubstring(u"\r\n", u"\n", aFallible)) { + return false; + } + + // Mac linebreaks: Map any remaining CR to LF: + if (!aString.ReplaceSubstring(u"\r", u"\n", aFallible)) { + return false; + } + } + + return true; +} + +void nsContentUtils::PopulateStringFromStringBuffer(nsStringBuffer* aBuf, + nsAString& aResultString) { + MOZ_ASSERT(aBuf, "Expecting a non-null string buffer"); + + uint32_t stringLen = NS_strlen(static_cast<char16_t*>(aBuf->Data())); + + // SANITY CHECK: In case the nsStringBuffer isn't correctly + // null-terminated, let's clamp its length using the allocated size, to be + // sure the resulting string doesn't sample past the end of the the buffer. + // (Note that StorageSize() is in units of bytes, so we have to convert that + // to units of PRUnichars, and subtract 1 for the null-terminator.) + uint32_t allocStringLen = (aBuf->StorageSize() / sizeof(char16_t)) - 1; + MOZ_ASSERT(stringLen <= allocStringLen, + "string buffer lacks null terminator!"); + stringLen = std::min(stringLen, allocStringLen); + + aBuf->ToString(stringLen, aResultString); +} + +already_AddRefed<nsContentList> nsContentUtils::GetElementsByClassName( + nsINode* aRootNode, const nsAString& aClasses) { + MOZ_ASSERT(aRootNode, "Must have root node"); + + return GetFuncStringContentList<nsCacheableFuncStringHTMLCollection>( + aRootNode, MatchClassNames, DestroyClassNameArray, AllocClassMatchingInfo, + aClasses); +} + +PresShell* nsContentUtils::FindPresShellForDocument(const Document* aDocument) { + const Document* doc = aDocument; + Document* displayDoc = doc->GetDisplayDocument(); + if (displayDoc) { + doc = displayDoc; + } + + PresShell* presShell = doc->GetPresShell(); + if (presShell) { + return presShell; + } + + nsCOMPtr<nsIDocShellTreeItem> docShellTreeItem = doc->GetDocShell(); + while (docShellTreeItem) { + // We may be in a display:none subdocument, or we may not have a presshell + // created yet. + // Walk the docshell tree to find the nearest container that has a + // presshell, and return that. + nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(docShellTreeItem); + if (PresShell* presShell = docShell->GetPresShell()) { + return presShell; + } + nsCOMPtr<nsIDocShellTreeItem> parent; + docShellTreeItem->GetInProcessParent(getter_AddRefs(parent)); + docShellTreeItem = parent; + } + + return nullptr; +} + +/* static */ +nsPresContext* nsContentUtils::FindPresContextForDocument( + const Document* aDocument) { + if (PresShell* presShell = FindPresShellForDocument(aDocument)) { + return presShell->GetPresContext(); + } + return nullptr; +} + +nsIWidget* nsContentUtils::WidgetForDocument(const Document* aDocument) { + PresShell* presShell = FindPresShellForDocument(aDocument); + if (!presShell) { + return nullptr; + } + nsViewManager* vm = presShell->GetViewManager(); + if (!vm) { + return nullptr; + } + nsView* rootView = vm->GetRootView(); + if (!rootView) { + return nullptr; + } + nsView* displayRoot = nsViewManager::GetDisplayRootFor(rootView); + if (!displayRoot) { + return nullptr; + } + return displayRoot->GetNearestWidget(nullptr); +} + +nsIWidget* nsContentUtils::WidgetForContent(const nsIContent* aContent) { + nsIFrame* frame = aContent->GetPrimaryFrame(); + if (frame) { + frame = nsLayoutUtils::GetDisplayRootFrame(frame); + + nsView* view = frame->GetView(); + if (view) { + return view->GetWidget(); + } + } + + return nullptr; +} + +WindowRenderer* nsContentUtils::WindowRendererForContent( + const nsIContent* aContent) { + nsIWidget* widget = nsContentUtils::WidgetForContent(aContent); + if (widget) { + return widget->GetWindowRenderer(); + } + + return nullptr; +} + +WindowRenderer* nsContentUtils::WindowRendererForDocument( + const Document* aDoc) { + nsIWidget* widget = nsContentUtils::WidgetForDocument(aDoc); + if (widget) { + return widget->GetWindowRenderer(); + } + + return nullptr; +} + +bool nsContentUtils::AllowXULXBLForPrincipal(nsIPrincipal* aPrincipal) { + if (!aPrincipal) { + return false; + } + + if (aPrincipal->IsSystemPrincipal()) { + return true; + } + + return (StaticPrefs::dom_allow_XUL_XBL_for_file() && + aPrincipal->SchemeIs("file")) || + IsSitePermAllow(aPrincipal, "allowXULXBL"_ns); +} + +bool nsContentUtils::IsPDFJSEnabled() { + nsCOMPtr<nsIStreamConverter> conv = do_CreateInstance( + "@mozilla.org/streamconv;1?from=application/pdf&to=text/html"); + return conv; +} + +bool nsContentUtils::IsPDFJS(nsIPrincipal* aPrincipal) { + if (!aPrincipal) { + return false; + } + nsAutoCString spec; + nsresult rv = aPrincipal->GetAsciiSpec(spec); + NS_ENSURE_SUCCESS(rv, false); + return spec.EqualsLiteral("resource://pdf.js/web/viewer.html"); +} + +bool nsContentUtils::IsSystemOrPDFJS(JSContext* aCx, JSObject*) { + nsIPrincipal* principal = SubjectPrincipal(aCx); + return principal && (principal->IsSystemPrincipal() || IsPDFJS(principal)); +} + +already_AddRefed<nsIDocumentLoaderFactory> +nsContentUtils::FindInternalContentViewer(const nsACString& aType, + ContentViewerType* aLoaderType) { + if (aLoaderType) { + *aLoaderType = TYPE_UNSUPPORTED; + } + + // one helper factory, please + nsCOMPtr<nsICategoryManager> catMan( + do_GetService(NS_CATEGORYMANAGER_CONTRACTID)); + if (!catMan) return nullptr; + + nsCOMPtr<nsIDocumentLoaderFactory> docFactory; + + nsCString contractID; + nsresult rv = + catMan->GetCategoryEntry("Gecko-Content-Viewers", aType, contractID); + if (NS_SUCCEEDED(rv)) { + docFactory = do_GetService(contractID.get()); + if (docFactory && aLoaderType) { + if (contractID.EqualsLiteral(CONTENT_DLF_CONTRACTID)) + *aLoaderType = TYPE_CONTENT; + else if (contractID.EqualsLiteral(PLUGIN_DLF_CONTRACTID)) + *aLoaderType = TYPE_FALLBACK; + else + *aLoaderType = TYPE_UNKNOWN; + } + return docFactory.forget(); + } + + if (DecoderTraits::IsSupportedInVideoDocument(aType)) { + docFactory = + do_GetService("@mozilla.org/content/document-loader-factory;1"); + if (docFactory && aLoaderType) { + *aLoaderType = TYPE_CONTENT; + } + return docFactory.forget(); + } + + return nullptr; +} + +static void ReportPatternCompileFailure(nsAString& aPattern, + const Document* aDocument, + JS::MutableHandle<JS::Value> error, + JSContext* cx) { + JS::AutoSaveExceptionState savedExc(cx); + JS::Rooted<JSObject*> exnObj(cx, &error.toObject()); + JS::Rooted<JS::Value> messageVal(cx); + if (!JS_GetProperty(cx, exnObj, "message", &messageVal)) { + return; + } + JS::Rooted<JSString*> messageStr(cx, messageVal.toString()); + MOZ_ASSERT(messageStr); + + AutoTArray<nsString, 2> strings; + strings.AppendElement(aPattern); + if (!AssignJSString(cx, *strings.AppendElement(), messageStr)) { + return; + } + + nsContentUtils::ReportToConsole(nsIScriptError::errorFlag, "DOM"_ns, + aDocument, nsContentUtils::eDOM_PROPERTIES, + "PatternAttributeCompileFailure", strings); + savedExc.drop(); +} + +// static +Maybe<bool> nsContentUtils::IsPatternMatching(nsAString& aValue, + nsAString& aPattern, + const Document* aDocument, + bool aHasMultiple) { + NS_ASSERTION(aDocument, "aDocument should be a valid pointer (not null)"); + + // The fact that we're using a JS regexp under the hood should not be visible + // to things like window onerror handlers, so we don't initialize our JSAPI + // with the document's window (which may not exist anyway). + AutoJSAPI jsapi; + jsapi.Init(); + JSContext* cx = jsapi.cx(); + AutoDisableJSInterruptCallback disabler(cx); + + // We can use the junk scope here, because we're just using it for regexp + // evaluation, not actual script execution, and we disable statics so that the + // evaluation does not interact with the execution global. + JSAutoRealm ar(cx, xpc::PrivilegedJunkScope()); + + // Check if the pattern by itself is valid first, and not that it only becomes + // valid once we add ^(?: and )$. + JS::Rooted<JS::Value> error(cx); + if (!JS::CheckRegExpSyntax( + cx, static_cast<char16_t*>(aPattern.BeginWriting()), + aPattern.Length(), JS::RegExpFlag::Unicode, &error)) { + return Nothing(); + } + + if (!error.isUndefined()) { + ReportPatternCompileFailure(aPattern, aDocument, &error, cx); + return Some(true); + } + + // The pattern has to match the entire value. + aPattern.InsertLiteral(u"^(?:", 0); + aPattern.AppendLiteral(")$"); + + JS::Rooted<JSObject*> re( + cx, + JS::NewUCRegExpObject(cx, static_cast<char16_t*>(aPattern.BeginWriting()), + aPattern.Length(), JS::RegExpFlag::Unicode)); + if (!re) { + return Nothing(); + } + + JS::Rooted<JS::Value> rval(cx, JS::NullValue()); + if (!aHasMultiple) { + size_t idx = 0; + if (!JS::ExecuteRegExpNoStatics( + cx, re, static_cast<char16_t*>(aValue.BeginWriting()), + aValue.Length(), &idx, true, &rval)) { + return Nothing(); + } + return Some(!rval.isNull()); + } + + HTMLSplitOnSpacesTokenizer tokenizer(aValue, ','); + while (tokenizer.hasMoreTokens()) { + const nsAString& value = tokenizer.nextToken(); + size_t idx = 0; + if (!JS::ExecuteRegExpNoStatics( + cx, re, static_cast<const char16_t*>(value.BeginReading()), + value.Length(), &idx, true, &rval)) { + return Nothing(); + } + if (rval.isNull()) { + return Some(false); + } + } + return Some(true); +} + +// static +nsresult nsContentUtils::URIInheritsSecurityContext(nsIURI* aURI, + bool* aResult) { + // Note: about:blank URIs do NOT inherit the security context from the + // current document, which is what this function tests for... + return NS_URIChainHasFlags( + aURI, nsIProtocolHandler::URI_INHERITS_SECURITY_CONTEXT, aResult); +} + +// static +bool nsContentUtils::ChannelShouldInheritPrincipal( + nsIPrincipal* aLoadingPrincipal, nsIURI* aURI, bool aInheritForAboutBlank, + bool aForceInherit) { + MOZ_ASSERT(aLoadingPrincipal, + "Can not check inheritance without a principal"); + + // Only tell the channel to inherit if it can't provide its own security + // context. + // + // XXX: If this is ever changed, check all callers for what owners + // they're passing in. In particular, see the code and + // comments in nsDocShell::LoadURI where we fall back on + // inheriting the owner if called from chrome. That would be + // very wrong if this code changed anything but channels that + // can't provide their own security context! + // + // If aForceInherit is true, we will inherit, even for a channel that + // can provide its own security context. This is used for srcdoc loads. + bool inherit = aForceInherit; + if (!inherit) { + bool uriInherits; + // We expect URIInheritsSecurityContext to return success for an + // about:blank URI, so don't call NS_IsAboutBlank() if this call fails. + // This condition needs to match the one in nsDocShell::InternalLoad where + // we're checking for things that will use the owner. + inherit = + (NS_SUCCEEDED(URIInheritsSecurityContext(aURI, &uriInherits)) && + (uriInherits || (aInheritForAboutBlank && NS_IsAboutBlank(aURI)))) || + // + // file: uri special-casing + // + // If this is a file: load opened from another file: then it may need + // to inherit the owner from the referrer so they can script each other. + // If we don't set the owner explicitly then each file: gets an owner + // based on its own codebase later. + // + (URIIsLocalFile(aURI) && + NS_SUCCEEDED(aLoadingPrincipal->CheckMayLoad(aURI, false)) && + // One more check here. CheckMayLoad will always return true for the + // system principal, but we do NOT want to inherit in that case. + !aLoadingPrincipal->IsSystemPrincipal()); + } + return inherit; +} + +/* static */ +bool nsContentUtils::IsCutCopyAllowed(Document* aDocument, + nsIPrincipal& aSubjectPrincipal) { + if (StaticPrefs::dom_allow_cut_copy() && aDocument && + aDocument->HasValidTransientUserGestureActivation()) { + return true; + } + + return PrincipalHasPermission(aSubjectPrincipal, nsGkAtoms::clipboardWrite); +} + +/* static */ +bool nsContentUtils::HaveEqualPrincipals(Document* aDoc1, Document* aDoc2) { + if (!aDoc1 || !aDoc2) { + return false; + } + bool principalsEqual = false; + aDoc1->NodePrincipal()->Equals(aDoc2->NodePrincipal(), &principalsEqual); + return principalsEqual; +} + +/* static */ +bool nsContentUtils::HasPluginWithUncontrolledEventDispatch( + nsIContent* aContent) { + return false; +} + +/* static */ +void nsContentUtils::FireMutationEventsForDirectParsing( + Document* aDoc, nsIContent* aDest, int32_t aOldChildCount) { + // Fire mutation events. Optimize for the case when there are no listeners + int32_t newChildCount = aDest->GetChildCount(); + if (newChildCount && nsContentUtils::HasMutationListeners( + aDoc, NS_EVENT_BITS_MUTATION_NODEINSERTED)) { + AutoTArray<nsCOMPtr<nsIContent>, 50> childNodes; + NS_ASSERTION(newChildCount - aOldChildCount >= 0, + "What, some unexpected dom mutation has happened?"); + childNodes.SetCapacity(newChildCount - aOldChildCount); + for (nsIContent* child = aDest->GetFirstChild(); child; + child = child->GetNextSibling()) { + childNodes.AppendElement(child); + } + FragmentOrElement::FireNodeInserted(aDoc, aDest, childNodes); + } +} + +/* static */ +const Document* nsContentUtils::GetInProcessSubtreeRootDocument( + const Document* aDoc) { + if (!aDoc) { + return nullptr; + } + const Document* doc = aDoc; + while (doc->GetInProcessParentDocument()) { + doc = doc->GetInProcessParentDocument(); + } + return doc; +} + +// static +int32_t nsContentUtils::GetAdjustedOffsetInTextControl(nsIFrame* aOffsetFrame, + int32_t aOffset) { + // The structure of the anonymous frames within a text control frame is + // an optional block frame, followed by an optional br frame. + + // If the offset frame has a child, then this frame is the block which + // has the text frames (containing the content) as its children. This will + // be the case if we click to the right of any of the text frames, or at the + // bottom of the text area. + nsIFrame* firstChild = aOffsetFrame->PrincipalChildList().FirstChild(); + if (firstChild) { + // In this case, the passed-in offset is incorrect, and we want the length + // of the entire content in the text control frame. + return firstChild->GetContent()->Length(); + } + + if (aOffsetFrame->GetPrevSibling() && !aOffsetFrame->GetNextSibling()) { + // In this case, we're actually within the last frame, which is a br + // frame. Our offset should therefore be the length of the first child of + // our parent. + int32_t aOutOffset = aOffsetFrame->GetParent() + ->PrincipalChildList() + .FirstChild() + ->GetContent() + ->Length(); + return aOutOffset; + } + + // Otherwise, we're within one of the text frames, in which case our offset + // has already been correctly calculated. + return aOffset; +} + +// static +void nsContentUtils::GetSelectionInTextControl(Selection* aSelection, + Element* aRoot, + uint32_t& aOutStartOffset, + uint32_t& aOutEndOffset) { + MOZ_ASSERT(aSelection && aRoot); + + // We don't care which end of this selection is anchor and which is focus. In + // fact, we explicitly want to know which is the _start_ and which is the + // _end_, not anchor vs focus. + const nsRange* range = aSelection->GetAnchorFocusRange(); + if (!range) { + // Nothing selected + aOutStartOffset = aOutEndOffset = 0; + return; + } + + // All the node pointers here are raw pointers for performance. We shouldn't + // be doing anything in this function that invalidates the node tree. + nsINode* startContainer = range->GetStartContainer(); + uint32_t startOffset = range->StartOffset(); + nsINode* endContainer = range->GetEndContainer(); + uint32_t endOffset = range->EndOffset(); + + // We have at most two children, consisting of an optional text node followed + // by an optional <br>. + NS_ASSERTION(aRoot->GetChildCount() <= 2, "Unexpected children"); + nsIContent* firstChild = aRoot->GetFirstChild(); +#ifdef DEBUG + nsCOMPtr<nsIContent> lastChild = aRoot->GetLastChild(); + NS_ASSERTION(startContainer == aRoot || startContainer == firstChild || + startContainer == lastChild, + "Unexpected startContainer"); + NS_ASSERTION(endContainer == aRoot || endContainer == firstChild || + endContainer == lastChild, + "Unexpected endContainer"); + // firstChild is either text or a <br> (hence an element). + MOZ_ASSERT_IF(firstChild, firstChild->IsText() || firstChild->IsElement()); +#endif + if (!firstChild || firstChild->IsElement()) { + // No text node, so everything is 0 + startOffset = endOffset = 0; + } else { + // First child is text. If the start/end is already in the text node, + // or the start of the root node, no change needed. If it's in the root + // node but not the start, or in the trailing <br>, we need to set the + // offset to the end. + if ((startContainer == aRoot && startOffset != 0) || + (startContainer != aRoot && startContainer != firstChild)) { + startOffset = firstChild->Length(); + } + if ((endContainer == aRoot && endOffset != 0) || + (endContainer != aRoot && endContainer != firstChild)) { + endOffset = firstChild->Length(); + } + } + + MOZ_ASSERT(startOffset <= endOffset); + aOutStartOffset = startOffset; + aOutEndOffset = endOffset; +} + +// static +HTMLEditor* nsContentUtils::GetHTMLEditor(nsPresContext* aPresContext) { + if (!aPresContext) { + return nullptr; + } + return GetHTMLEditor(aPresContext->GetDocShell()); +} + +// static +HTMLEditor* nsContentUtils::GetHTMLEditor(nsDocShell* aDocShell) { + bool isEditable; + if (!aDocShell || NS_FAILED(aDocShell->GetEditable(&isEditable)) || + !isEditable) { + return nullptr; + } + return aDocShell->GetHTMLEditor(); +} + +// static +EditorBase* nsContentUtils::GetActiveEditor(nsPresContext* aPresContext) { + if (!aPresContext) { + return nullptr; + } + + return GetActiveEditor(aPresContext->Document()->GetWindow()); +} + +// static +EditorBase* nsContentUtils::GetActiveEditor(nsPIDOMWindowOuter* aWindow) { + if (!aWindow || !aWindow->GetExtantDoc()) { + return nullptr; + } + + // If it's in designMode, nobody can have focus. Therefore, the HTMLEditor + // handles all events. I.e., it's focused editor in this case. + if (aWindow->GetExtantDoc()->IsInDesignMode()) { + return GetHTMLEditor(nsDocShell::Cast(aWindow->GetDocShell())); + } + + // If focused element is associated with TextEditor, it must be <input> + // element or <textarea> element. Let's return it even if it's in a + // contenteditable element. + nsCOMPtr<nsPIDOMWindowOuter> focusedWindow; + if (Element* focusedElement = nsFocusManager::GetFocusedDescendant( + aWindow, nsFocusManager::SearchRange::eOnlyCurrentWindow, + getter_AddRefs(focusedWindow))) { + if (TextEditor* textEditor = focusedElement->GetTextEditorInternal()) { + return textEditor; + } + } + + // Otherwise, HTMLEditor may handle inputs even non-editable element has + // focus or nobody has focus. + return GetHTMLEditor(nsDocShell::Cast(aWindow->GetDocShell())); +} + +// static +TextEditor* nsContentUtils::GetTextEditorFromAnonymousNodeWithoutCreation( + const nsIContent* aAnonymousContent) { + if (!aAnonymousContent) { + return nullptr; + } + nsIContent* parent = aAnonymousContent->FindFirstNonChromeOnlyAccessContent(); + if (!parent || parent == aAnonymousContent) { + return nullptr; + } + if (HTMLInputElement* inputElement = + HTMLInputElement::FromNodeOrNull(parent)) { + return inputElement->GetTextEditorWithoutCreation(); + } + if (HTMLTextAreaElement* textareaElement = + HTMLTextAreaElement::FromNodeOrNull(parent)) { + return textareaElement->GetTextEditorWithoutCreation(); + } + return nullptr; +} + +// static +bool nsContentUtils::IsNodeInEditableRegion(nsINode* aNode) { + while (aNode) { + if (aNode->IsEditable()) { + return true; + } + aNode = aNode->GetParent(); + } + return false; +} + +// static +bool nsContentUtils::IsForbiddenRequestHeader(const nsACString& aHeader, + const nsACString& aValue) { + if (IsForbiddenSystemRequestHeader(aHeader)) { + return true; + } + + if ((nsContentUtils::IsOverrideMethodHeader(aHeader) && + nsContentUtils::ContainsForbiddenMethod(aValue))) { + return true; + } + + if (StringBeginsWith(aHeader, "proxy-"_ns, + nsCaseInsensitiveCStringComparator) || + StringBeginsWith(aHeader, "sec-"_ns, + nsCaseInsensitiveCStringComparator)) { + return true; + } + + return false; +} + +// static +bool nsContentUtils::IsForbiddenSystemRequestHeader(const nsACString& aHeader) { + static const char* kInvalidHeaders[] = {"accept-charset", + "accept-encoding", + "access-control-request-headers", + "access-control-request-method", + "connection", + "content-length", + "cookie", + "cookie2", + "date", + "dnt", + "expect", + "host", + "keep-alive", + "origin", + "referer", + "set-cookie", + "te", + "trailer", + "transfer-encoding", + "upgrade", + "via"}; + for (auto& kInvalidHeader : kInvalidHeaders) { + if (aHeader.LowerCaseEqualsASCII(kInvalidHeader)) { + return true; + } + } + return false; +} + +// static +bool nsContentUtils::IsForbiddenResponseHeader(const nsACString& aHeader) { + return (aHeader.LowerCaseEqualsASCII("set-cookie") || + aHeader.LowerCaseEqualsASCII("set-cookie2")); +} + +// static +bool nsContentUtils::IsOverrideMethodHeader(const nsACString& headerName) { + return headerName.EqualsIgnoreCase("x-http-method-override") || + headerName.EqualsIgnoreCase("x-http-method") || + headerName.EqualsIgnoreCase("x-method-override"); +} + +// static +bool nsContentUtils::ContainsForbiddenMethod(const nsACString& headerValue) { + bool hasInsecureMethod = false; + nsCCharSeparatedTokenizer tokenizer(headerValue, ','); + + while (tokenizer.hasMoreTokens()) { + const nsDependentCSubstring& value = tokenizer.nextToken(); + + if (value.EqualsIgnoreCase("connect") || value.EqualsIgnoreCase("trace") || + value.EqualsIgnoreCase("track")) { + hasInsecureMethod = true; + break; + } + } + + return hasInsecureMethod; +} + +// static +bool nsContentUtils::IsCorsUnsafeRequestHeaderValue( + const nsACString& aHeaderValue) { + const char* cur = aHeaderValue.BeginReading(); + const char* end = aHeaderValue.EndReading(); + + while (cur != end) { + // Implementation of + // https://fetch.spec.whatwg.org/#cors-unsafe-request-header-byte Is less + // than a space but not a horizontal tab + if ((*cur < ' ' && *cur != '\t') || *cur == '"' || *cur == '(' || + *cur == ')' || *cur == ':' || *cur == '<' || *cur == '>' || + *cur == '?' || *cur == '@' || *cur == '[' || *cur == '\\' || + *cur == ']' || *cur == '{' || *cur == '}' || + *cur == 0x7F) { // 0x75 is DEL + return true; + } + cur++; + } + return false; +} + +// static +bool nsContentUtils::IsAllowedNonCorsAccept(const nsACString& aHeaderValue) { + if (IsCorsUnsafeRequestHeaderValue(aHeaderValue)) { + return false; + } + return true; +} + +// static +bool nsContentUtils::IsAllowedNonCorsContentType( + const nsACString& aHeaderValue) { + nsAutoCString contentType; + nsAutoCString unused; + + if (IsCorsUnsafeRequestHeaderValue(aHeaderValue)) { + return false; + } + + nsresult rv = NS_ParseRequestContentType(aHeaderValue, contentType, unused); + if (NS_FAILED(rv)) { + return false; + } + + return contentType.LowerCaseEqualsLiteral("text/plain") || + contentType.LowerCaseEqualsLiteral( + "application/x-www-form-urlencoded") || + contentType.LowerCaseEqualsLiteral("multipart/form-data"); +} + +// static +bool nsContentUtils::IsAllowedNonCorsLanguage(const nsACString& aHeaderValue) { + const char* cur = aHeaderValue.BeginReading(); + const char* end = aHeaderValue.EndReading(); + + while (cur != end) { + if ((*cur >= '0' && *cur <= '9') || (*cur >= 'A' && *cur <= 'Z') || + (*cur >= 'a' && *cur <= 'z') || *cur == ' ' || *cur == '*' || + *cur == ',' || *cur == '-' || *cur == '.' || *cur == ';' || + *cur == '=') { + cur++; + continue; + } + return false; + } + return true; +} + +// static +bool nsContentUtils::IsCORSSafelistedRequestHeader(const nsACString& aName, + const nsACString& aValue) { + // see https://fetch.spec.whatwg.org/#cors-safelisted-request-header + if (aValue.Length() > 128) { + return false; + } + return (aName.LowerCaseEqualsLiteral("accept") && + nsContentUtils::IsAllowedNonCorsAccept(aValue)) || + (aName.LowerCaseEqualsLiteral("accept-language") && + nsContentUtils::IsAllowedNonCorsLanguage(aValue)) || + (aName.LowerCaseEqualsLiteral("content-language") && + nsContentUtils::IsAllowedNonCorsLanguage(aValue)) || + (aName.LowerCaseEqualsLiteral("content-type") && + nsContentUtils::IsAllowedNonCorsContentType(aValue)); +} + +mozilla::LogModule* nsContentUtils::ResistFingerprintingLog() { + return gResistFingerprintingLog; +} +mozilla::LogModule* nsContentUtils::DOMDumpLog() { return sDOMDumpLog; } + +bool nsContentUtils::GetNodeTextContent(const nsINode* aNode, bool aDeep, + nsAString& aResult, + const fallible_t& aFallible) { + aResult.Truncate(); + return AppendNodeTextContent(aNode, aDeep, aResult, aFallible); +} + +void nsContentUtils::GetNodeTextContent(const nsINode* aNode, bool aDeep, + nsAString& aResult) { + if (!GetNodeTextContent(aNode, aDeep, aResult, fallible)) { + NS_ABORT_OOM(0); // Unfortunately we don't know the allocation size + } +} + +void nsContentUtils::DestroyMatchString(void* aData) { + if (aData) { + nsString* matchString = static_cast<nsString*>(aData); + delete matchString; + } +} + +bool nsContentUtils::IsJavascriptMIMEType(const nsAString& aMIMEType) { + // Table ordered from most to least likely JS MIME types. + static const char* jsTypes[] = {"text/javascript", + "text/ecmascript", + "application/javascript", + "application/ecmascript", + "application/x-javascript", + "application/x-ecmascript", + "text/javascript1.0", + "text/javascript1.1", + "text/javascript1.2", + "text/javascript1.3", + "text/javascript1.4", + "text/javascript1.5", + "text/jscript", + "text/livescript", + "text/x-ecmascript", + "text/x-javascript", + nullptr}; + + for (uint32_t i = 0; jsTypes[i]; ++i) { + if (aMIMEType.LowerCaseEqualsASCII(jsTypes[i])) { + return true; + } + } + + return false; +} + +bool nsContentUtils::PrefetchPreloadEnabled(nsIDocShell* aDocShell) { + // + // SECURITY CHECK: disable prefetching and preloading from mailnews! + // + // walk up the docshell tree to see if any containing + // docshell are of type MAIL. + // + + if (!aDocShell) { + return false; + } + + nsCOMPtr<nsIDocShell> docshell = aDocShell; + nsCOMPtr<nsIDocShellTreeItem> parentItem; + + do { + auto appType = docshell->GetAppType(); + if (appType == nsIDocShell::APP_TYPE_MAIL) { + return false; // do not prefetch, preload, preconnect from mailnews + } + + docshell->GetInProcessParent(getter_AddRefs(parentItem)); + if (parentItem) { + docshell = do_QueryInterface(parentItem); + if (!docshell) { + NS_ERROR("cannot get a docshell from a treeItem!"); + return false; + } + } + } while (parentItem); + + return true; +} + +uint64_t nsContentUtils::GetInnerWindowID(nsIRequest* aRequest) { + // can't do anything if there's no nsIRequest! + if (!aRequest) { + return 0; + } + + nsCOMPtr<nsILoadGroup> loadGroup; + nsresult rv = aRequest->GetLoadGroup(getter_AddRefs(loadGroup)); + + if (NS_FAILED(rv) || !loadGroup) { + return 0; + } + + return GetInnerWindowID(loadGroup); +} + +uint64_t nsContentUtils::GetInnerWindowID(nsILoadGroup* aLoadGroup) { + if (!aLoadGroup) { + return 0; + } + + nsCOMPtr<nsIInterfaceRequestor> callbacks; + nsresult rv = aLoadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks)); + if (NS_FAILED(rv) || !callbacks) { + return 0; + } + + nsCOMPtr<nsILoadContext> loadContext = do_GetInterface(callbacks); + if (!loadContext) { + return 0; + } + + nsCOMPtr<mozIDOMWindowProxy> window; + rv = loadContext->GetAssociatedWindow(getter_AddRefs(window)); + if (NS_FAILED(rv) || !window) { + return 0; + } + + auto* pwindow = nsPIDOMWindowOuter::From(window); + if (!pwindow) { + return 0; + } + + nsPIDOMWindowInner* inner = pwindow->GetCurrentInnerWindow(); + return inner ? inner->WindowID() : 0; +} + +// static +void nsContentUtils::MaybeFixIPv6Host(nsACString& aHost) { + if (aHost.FindChar(':') != -1) { // Escape IPv6 address + MOZ_ASSERT(!aHost.Length() || + (aHost[0] != '[' && aHost[aHost.Length() - 1] != ']')); + aHost.Insert('[', 0); + aHost.Append(']'); + } +} + +nsresult nsContentUtils::GetHostOrIPv6WithBrackets(nsIURI* aURI, + nsACString& aHost) { + aHost.Truncate(); + nsresult rv = aURI->GetHost(aHost); + if (NS_FAILED(rv)) { // Some URIs do not have a host + return rv; + } + + MaybeFixIPv6Host(aHost); + + return NS_OK; +} + +nsresult nsContentUtils::GetHostOrIPv6WithBrackets(nsIURI* aURI, + nsAString& aHost) { + nsAutoCString hostname; + nsresult rv = GetHostOrIPv6WithBrackets(aURI, hostname); + if (NS_FAILED(rv)) { + return rv; + } + CopyUTF8toUTF16(hostname, aHost); + return NS_OK; +} + +nsresult nsContentUtils::GetHostOrIPv6WithBrackets(nsIPrincipal* aPrincipal, + nsACString& aHost) { + nsresult rv = aPrincipal->GetAsciiHost(aHost); + if (NS_FAILED(rv)) { // Some URIs do not have a host + return rv; + } + + MaybeFixIPv6Host(aHost); + return NS_OK; +} + +CallState nsContentUtils::CallOnAllRemoteChildren( + MessageBroadcaster* aManager, + const std::function<CallState(BrowserParent*)>& aCallback) { + uint32_t browserChildCount = aManager->ChildCount(); + for (uint32_t j = 0; j < browserChildCount; ++j) { + RefPtr<MessageListenerManager> childMM = aManager->GetChildAt(j); + if (!childMM) { + continue; + } + + RefPtr<MessageBroadcaster> nonLeafMM = MessageBroadcaster::From(childMM); + if (nonLeafMM) { + if (CallOnAllRemoteChildren(nonLeafMM, aCallback) == CallState::Stop) { + return CallState::Stop; + } + continue; + } + + mozilla::dom::ipc::MessageManagerCallback* cb = childMM->GetCallback(); + if (cb) { + nsFrameLoader* fl = static_cast<nsFrameLoader*>(cb); + BrowserParent* remote = BrowserParent::GetFrom(fl); + if (remote && aCallback) { + if (aCallback(remote) == CallState::Stop) { + return CallState::Stop; + } + } + } + } + + return CallState::Continue; +} + +void nsContentUtils::CallOnAllRemoteChildren( + nsPIDOMWindowOuter* aWindow, + const std::function<CallState(BrowserParent*)>& aCallback) { + nsGlobalWindowOuter* window = nsGlobalWindowOuter::Cast(aWindow); + if (window->IsChromeWindow()) { + RefPtr<MessageBroadcaster> windowMM = window->GetMessageManager(); + if (windowMM) { + CallOnAllRemoteChildren(windowMM, aCallback); + } + } +} + +bool nsContentUtils::IPCTransferableDataItemHasKnownFlavor( + const IPCTransferableDataItem& aItem) { + // Unknown types are converted to kCustomTypesMime. + if (aItem.flavor().EqualsASCII(kCustomTypesMime)) { + return true; + } + + for (const char* format : DataTransfer::kKnownFormats) { + if (aItem.flavor().EqualsASCII(format)) { + return true; + } + } + + return false; +} + +nsresult nsContentUtils::IPCTransferableDataToTransferable( + const IPCTransferableData& aTransferableData, bool aAddDataFlavor, + nsITransferable* aTransferable, const bool aFilterUnknownFlavors) { + nsresult rv; + const nsTArray<IPCTransferableDataItem>& items = aTransferableData.items(); + for (const auto& item : items) { + if (aFilterUnknownFlavors && !IPCTransferableDataItemHasKnownFlavor(item)) { + NS_WARNING( + "Ignoring unknown flavor in " + "nsContentUtils::IPCTransferableDataToTransferable"); + continue; + } + + if (aAddDataFlavor) { + aTransferable->AddDataFlavor(item.flavor().get()); + } + + nsCOMPtr<nsISupports> transferData; + switch (item.data().type()) { + case IPCTransferableDataType::TIPCTransferableDataString: { + const auto& data = item.data().get_IPCTransferableDataString(); + nsCOMPtr<nsISupportsString> dataWrapper = + do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID, &rv); + NS_ENSURE_SUCCESS(rv, rv); + rv = dataWrapper->SetData(nsDependentSubstring( + reinterpret_cast<const char16_t*>(data.data().Data()), + data.data().Size() / sizeof(char16_t))); + NS_ENSURE_SUCCESS(rv, rv); + transferData = dataWrapper; + break; + } + case IPCTransferableDataType::TIPCTransferableDataCString: { + const auto& data = item.data().get_IPCTransferableDataCString(); + nsCOMPtr<nsISupportsCString> dataWrapper = + do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID, &rv); + NS_ENSURE_SUCCESS(rv, rv); + rv = dataWrapper->SetData(nsDependentCSubstring( + reinterpret_cast<const char*>(data.data().Data()), + data.data().Size())); + NS_ENSURE_SUCCESS(rv, rv); + transferData = dataWrapper; + break; + } + case IPCTransferableDataType::TIPCTransferableDataInputStream: { + const auto& data = item.data().get_IPCTransferableDataInputStream(); + nsCOMPtr<nsIInputStream> stream; + rv = NS_NewByteInputStream(getter_AddRefs(stream), + AsChars(data.data().AsSpan()), + NS_ASSIGNMENT_COPY); + NS_ENSURE_SUCCESS(rv, rv); + transferData = stream.forget(); + break; + } + case IPCTransferableDataType::TIPCTransferableDataImageContainer: { + const auto& data = item.data().get_IPCTransferableDataImageContainer(); + nsCOMPtr<imgIContainer> container; + rv = DeserializeTransferableDataImageContainer( + data, getter_AddRefs(container)); + NS_ENSURE_SUCCESS(rv, rv); + transferData = container; + break; + } + case IPCTransferableDataType::TIPCTransferableDataBlob: { + const auto& data = item.data().get_IPCTransferableDataBlob(); + transferData = IPCBlobUtils::Deserialize(data.blob()); + break; + } + case IPCTransferableDataType::T__None: + MOZ_ASSERT_UNREACHABLE(); + return NS_ERROR_FAILURE; + } + + rv = aTransferable->SetTransferData(item.flavor().get(), transferData); + NS_ENSURE_SUCCESS(rv, rv); + } + return NS_OK; +} + +nsresult nsContentUtils::IPCTransferableDataToTransferable( + const IPCTransferableData& aTransferableData, const bool& aIsPrivateData, + nsIPrincipal* aRequestingPrincipal, + const nsContentPolicyType& aContentPolicyType, bool aAddDataFlavor, + nsITransferable* aTransferable, const bool aFilterUnknownFlavors) { + // Note that we need to set privacy status of transferable before adding any + // data into it. + aTransferable->SetIsPrivateData(aIsPrivateData); + + nsresult rv = IPCTransferableDataToTransferable( + aTransferableData, aAddDataFlavor, aTransferable, aFilterUnknownFlavors); + NS_ENSURE_SUCCESS(rv, rv); + + aTransferable->SetRequestingPrincipal(aRequestingPrincipal); + aTransferable->SetContentPolicyType(aContentPolicyType); + return NS_OK; +} + +nsresult nsContentUtils::IPCTransferableToTransferable( + const IPCTransferable& aIPCTransferable, bool aAddDataFlavor, + nsITransferable* aTransferable, const bool aFilterUnknownFlavors) { + nsresult rv = IPCTransferableDataToTransferable( + aIPCTransferable.data(), aIPCTransferable.isPrivateData(), + aIPCTransferable.requestingPrincipal(), + aIPCTransferable.contentPolicyType(), aAddDataFlavor, aTransferable, + aFilterUnknownFlavors); + NS_ENSURE_SUCCESS(rv, rv); + + if (aIPCTransferable.cookieJarSettings().isSome()) { + nsCOMPtr<nsICookieJarSettings> cookieJarSettings; + net::CookieJarSettings::Deserialize( + aIPCTransferable.cookieJarSettings().ref(), + getter_AddRefs(cookieJarSettings)); + aTransferable->SetCookieJarSettings(cookieJarSettings); + } + aTransferable->SetReferrerInfo(aIPCTransferable.referrerInfo()); + return NS_OK; +} + +nsresult nsContentUtils::IPCTransferableDataItemToVariant( + const IPCTransferableDataItem& aItem, nsIWritableVariant* aVariant) { + MOZ_ASSERT(aVariant); + + switch (aItem.data().type()) { + case IPCTransferableDataType::TIPCTransferableDataString: { + const auto& data = aItem.data().get_IPCTransferableDataString(); + return aVariant->SetAsAString(nsDependentSubstring( + reinterpret_cast<const char16_t*>(data.data().Data()), + data.data().Size() / sizeof(char16_t))); + } + case IPCTransferableDataType::TIPCTransferableDataCString: { + const auto& data = aItem.data().get_IPCTransferableDataCString(); + return aVariant->SetAsACString(nsDependentCSubstring( + reinterpret_cast<const char*>(data.data().Data()), + data.data().Size())); + } + case IPCTransferableDataType::TIPCTransferableDataInputStream: { + const auto& data = aItem.data().get_IPCTransferableDataInputStream(); + nsCOMPtr<nsIInputStream> stream; + nsresult rv = NS_NewByteInputStream(getter_AddRefs(stream), + AsChars(data.data().AsSpan()), + NS_ASSIGNMENT_COPY); + NS_ENSURE_SUCCESS(rv, rv); + return aVariant->SetAsISupports(stream); + } + case IPCTransferableDataType::TIPCTransferableDataImageContainer: { + const auto& data = aItem.data().get_IPCTransferableDataImageContainer(); + nsCOMPtr<imgIContainer> container; + nsresult rv = DeserializeTransferableDataImageContainer( + data, getter_AddRefs(container)); + NS_ENSURE_SUCCESS(rv, rv); + return aVariant->SetAsISupports(container); + } + case IPCTransferableDataType::TIPCTransferableDataBlob: { + const auto& data = aItem.data().get_IPCTransferableDataBlob(); + RefPtr<BlobImpl> blobImpl = IPCBlobUtils::Deserialize(data.blob()); + return aVariant->SetAsISupports(blobImpl); + } + case IPCTransferableDataType::T__None: + break; + } + + MOZ_ASSERT_UNREACHABLE(); + return NS_ERROR_UNEXPECTED; +} + +void nsContentUtils::TransferablesToIPCTransferableDatas( + nsIArray* aTransferables, nsTArray<IPCTransferableData>& aIPC, + bool aInSyncMessage, mozilla::dom::ContentParent* aParent) { + aIPC.Clear(); + if (aTransferables) { + uint32_t transferableCount = 0; + aTransferables->GetLength(&transferableCount); + for (uint32_t i = 0; i < transferableCount; ++i) { + IPCTransferableData* dt = aIPC.AppendElement(); + nsCOMPtr<nsITransferable> transferable = + do_QueryElementAt(aTransferables, i); + TransferableToIPCTransferableData(transferable, dt, aInSyncMessage, + aParent); + } + } +} + +nsresult nsContentUtils::CalculateBufferSizeForImage( + const uint32_t& aStride, const IntSize& aImageSize, + const SurfaceFormat& aFormat, size_t* aMaxBufferSize, + size_t* aUsedBufferSize) { + CheckedInt32 requiredBytes = + CheckedInt32(aStride) * CheckedInt32(aImageSize.height); + + CheckedInt32 usedBytes = + requiredBytes - aStride + + (CheckedInt32(aImageSize.width) * BytesPerPixel(aFormat)); + if (!usedBytes.isValid()) { + return NS_ERROR_FAILURE; + } + + MOZ_ASSERT(requiredBytes.isValid(), "usedBytes valid but not required?"); + *aMaxBufferSize = requiredBytes.value(); + *aUsedBufferSize = usedBytes.value(); + return NS_OK; +} + +static already_AddRefed<DataSourceSurface> BigBufferToDataSurface( + BigBuffer& aData, uint32_t aStride, const IntSize& aImageSize, + SurfaceFormat aFormat) { + if (!aData.Size() || !aImageSize.width || !aImageSize.height) { + return nullptr; + } + + // Validate shared memory buffer size + size_t imageBufLen = 0; + size_t maxBufLen = 0; + if (NS_FAILED(nsContentUtils::CalculateBufferSizeForImage( + aStride, aImageSize, aFormat, &maxBufLen, &imageBufLen))) { + return nullptr; + } + if (imageBufLen > aData.Size()) { + return nullptr; + } + return CreateDataSourceSurfaceFromData(aImageSize, aFormat, aData.Data(), + aStride); +} + +nsresult nsContentUtils::DeserializeTransferableDataImageContainer( + const IPCTransferableDataImageContainer& aData, + imgIContainer** aContainer) { + const IntSize size(aData.width(), aData.height()); + size_t maxBufferSize = 0; + size_t usedBufferSize = 0; + nsresult rv = CalculateBufferSizeForImage( + aData.stride(), size, aData.format(), &maxBufferSize, &usedBufferSize); + NS_ENSURE_SUCCESS(rv, rv); + if (usedBufferSize > aData.data().Size()) { + return NS_ERROR_FAILURE; + } + RefPtr<DataSourceSurface> surface = + CreateDataSourceSurfaceFromData(size, aData.format(), aData.data().Data(), + static_cast<int32_t>(aData.stride())); + if (!surface) { + return NS_ERROR_FAILURE; + } + RefPtr<gfxDrawable> drawable = new gfxSurfaceDrawable(surface, size); + nsCOMPtr<imgIContainer> imageContainer = + image::ImageOps::CreateFromDrawable(drawable); + imageContainer.forget(aContainer); + + return NS_OK; +} + +bool nsContentUtils::IsFlavorImage(const nsACString& aFlavor) { + return aFlavor.EqualsLiteral(kNativeImageMime) || + aFlavor.EqualsLiteral(kJPEGImageMime) || + aFlavor.EqualsLiteral(kJPGImageMime) || + aFlavor.EqualsLiteral(kPNGImageMime) || + aFlavor.EqualsLiteral(kGIFImageMime); +} + +// FIXME: This can probably be removed once bug 1783240 lands, as `nsString` +// will be implicitly serialized in shmem when sent over IPDL directly. +static IPCTransferableDataString AsIPCTransferableDataString( + Span<const char16_t> aInput) { + return IPCTransferableDataString{BigBuffer(AsBytes(aInput))}; +} + +// FIXME: This can probably be removed once bug 1783240 lands, as `nsCString` +// will be implicitly serialized in shmem when sent over IPDL directly. +static IPCTransferableDataCString AsIPCTransferableDataCString( + Span<const char> aInput) { + return IPCTransferableDataCString{BigBuffer(AsBytes(aInput))}; +} + +void nsContentUtils::TransferableToIPCTransferableData( + nsITransferable* aTransferable, IPCTransferableData* aTransferableData, + bool aInSyncMessage, mozilla::dom::ContentParent* aParent) { + MOZ_ASSERT_IF(XRE_IsParentProcess(), aParent); + + if (aTransferable) { + nsTArray<nsCString> flavorList; + aTransferable->FlavorsTransferableCanExport(flavorList); + + for (uint32_t j = 0; j < flavorList.Length(); ++j) { + nsCString& flavorStr = flavorList[j]; + if (!flavorStr.Length()) { + continue; + } + + nsCOMPtr<nsISupports> data; + nsresult rv = + aTransferable->GetTransferData(flavorStr.get(), getter_AddRefs(data)); + + if (NS_FAILED(rv) || !data) { + if (aInSyncMessage) { + // Can't do anything. + // FIXME: This shouldn't be the case anymore! + continue; + } + + // This is a hack to support kFilePromiseMime. + // On Windows there just needs to be an entry for it, + // and for OSX we need to create + // nsContentAreaDragDropDataProvider as nsIFlavorDataProvider. + if (flavorStr.EqualsLiteral(kFilePromiseMime)) { + IPCTransferableDataItem* item = + aTransferableData->items().AppendElement(); + item->flavor() = flavorStr; + item->data() = + AsIPCTransferableDataString(NS_ConvertUTF8toUTF16(flavorStr)); + continue; + } + + // Empty element, transfer only the flavor + IPCTransferableDataItem* item = + aTransferableData->items().AppendElement(); + item->flavor() = flavorStr; + item->data() = AsIPCTransferableDataString(EmptyString()); + continue; + } + + // We need to handle nsIInputStream before nsISupportsCString, otherwise + // nsStringInputStream would be converted into a wrong type. + if (nsCOMPtr<nsIInputStream> stream = do_QueryInterface(data)) { + IPCTransferableDataItem* item = + aTransferableData->items().AppendElement(); + item->flavor() = flavorStr; + nsCString imageData; + DebugOnly<nsresult> rv = + NS_ConsumeStream(stream, UINT32_MAX, imageData); + MOZ_ASSERT( + rv != NS_BASE_STREAM_WOULD_BLOCK, + "cannot use async input streams in nsITransferable right now"); + // FIXME: This can probably be simplified once bug 1783240 lands, as + // `nsCString` will be implicitly serialized in shmem when sent over + // IPDL directly. + item->data() = + IPCTransferableDataInputStream(BigBuffer(AsBytes(Span(imageData)))); + continue; + } + + if (nsCOMPtr<nsISupportsString> text = do_QueryInterface(data)) { + nsAutoString dataAsString; + MOZ_ALWAYS_SUCCEEDS(text->GetData(dataAsString)); + + IPCTransferableDataItem* item = + aTransferableData->items().AppendElement(); + item->flavor() = flavorStr; + item->data() = AsIPCTransferableDataString(dataAsString); + continue; + } + + if (nsCOMPtr<nsISupportsCString> ctext = do_QueryInterface(data)) { + nsAutoCString dataAsString; + MOZ_ALWAYS_SUCCEEDS(ctext->GetData(dataAsString)); + + IPCTransferableDataItem* item = + aTransferableData->items().AppendElement(); + item->flavor() = flavorStr; + item->data() = AsIPCTransferableDataCString(dataAsString); + continue; + } + + if (nsCOMPtr<imgIContainer> image = do_QueryInterface(data)) { + // Images to be placed on the clipboard are imgIContainers. + RefPtr<mozilla::gfx::SourceSurface> surface = image->GetFrame( + imgIContainer::FRAME_CURRENT, + imgIContainer::FLAG_SYNC_DECODE | imgIContainer::FLAG_ASYNC_NOTIFY); + if (!surface) { + continue; + } + RefPtr<mozilla::gfx::DataSourceSurface> dataSurface = + surface->GetDataSurface(); + if (!dataSurface) { + continue; + } + size_t length; + int32_t stride; + Maybe<BigBuffer> surfaceData = + GetSurfaceData(*dataSurface, &length, &stride); + + if (surfaceData.isNothing()) { + continue; + } + + IPCTransferableDataItem* item = + aTransferableData->items().AppendElement(); + item->flavor() = flavorStr; + + mozilla::gfx::IntSize size = dataSurface->GetSize(); + item->data() = IPCTransferableDataImageContainer( + std::move(*surfaceData), size.width, size.height, stride, + dataSurface->GetFormat()); + continue; + } + + // Otherwise, handle this as a file. + nsCOMPtr<BlobImpl> blobImpl; + if (nsCOMPtr<nsIFile> file = do_QueryInterface(data)) { + if (aParent) { + bool isDir = false; + if (NS_SUCCEEDED(file->IsDirectory(&isDir)) && isDir) { + nsAutoString path; + if (NS_WARN_IF(NS_FAILED(file->GetPath(path)))) { + continue; + } + + RefPtr<FileSystemSecurity> fss = FileSystemSecurity::GetOrCreate(); + fss->GrantAccessToContentProcess(aParent->ChildID(), path); + } + } + + blobImpl = new FileBlobImpl(file); + + IgnoredErrorResult rv; + + // Ensure that file data is cached no that the content process + // has this data available to it when passed over: + blobImpl->GetSize(rv); + if (NS_WARN_IF(rv.Failed())) { + continue; + } + + blobImpl->GetLastModified(rv); + if (NS_WARN_IF(rv.Failed())) { + continue; + } + } else { + if (aInSyncMessage) { + // Can't do anything. + // FIXME: This shouldn't be the case anymore! + continue; + } + + blobImpl = do_QueryInterface(data); + } + + if (blobImpl) { + // If we failed to create the blob actor, then this blob probably + // can't get the file size for the underlying file, ignore it for + // now. TODO pass this through anyway. + IPCBlob ipcBlob; + nsresult rv = IPCBlobUtils::Serialize(blobImpl, ipcBlob); + if (NS_WARN_IF(NS_FAILED(rv))) { + continue; + } + + IPCTransferableDataItem* item = + aTransferableData->items().AppendElement(); + item->flavor() = flavorStr; + item->data() = IPCTransferableDataBlob(ipcBlob); + } + } + } +} + +void nsContentUtils::TransferableToIPCTransferable( + nsITransferable* aTransferable, IPCTransferable* aIPCTransferable, + bool aInSyncMessage, mozilla::dom::ContentParent* aParent) { + IPCTransferableData ipcTransferableData; + TransferableToIPCTransferableData(aTransferable, &ipcTransferableData, + aInSyncMessage, aParent); + + Maybe<net::CookieJarSettingsArgs> cookieJarSettingsArgs; + if (nsCOMPtr<nsICookieJarSettings> cookieJarSettings = + aTransferable->GetCookieJarSettings()) { + net::CookieJarSettingsArgs args; + net::CookieJarSettings::Cast(cookieJarSettings)->Serialize(args); + cookieJarSettingsArgs = Some(std::move(args)); + } + + aIPCTransferable->data() = std::move(ipcTransferableData); + aIPCTransferable->isPrivateData() = aTransferable->GetIsPrivateData(); + aIPCTransferable->requestingPrincipal() = + aTransferable->GetRequestingPrincipal(); + aIPCTransferable->cookieJarSettings() = std::move(cookieJarSettingsArgs); + aIPCTransferable->contentPolicyType() = aTransferable->GetContentPolicyType(); + aIPCTransferable->referrerInfo() = aTransferable->GetReferrerInfo(); +} + +Maybe<BigBuffer> nsContentUtils::GetSurfaceData(DataSourceSurface& aSurface, + size_t* aLength, + int32_t* aStride) { + mozilla::gfx::DataSourceSurface::MappedSurface map; + if (!aSurface.Map(mozilla::gfx::DataSourceSurface::MapType::READ, &map)) { + return Nothing(); + } + + size_t bufLen = 0; + size_t maxBufLen = 0; + nsresult rv = nsContentUtils::CalculateBufferSizeForImage( + map.mStride, aSurface.GetSize(), aSurface.GetFormat(), &maxBufLen, + &bufLen); + if (NS_FAILED(rv)) { + aSurface.Unmap(); + return Nothing(); + } + + BigBuffer surfaceData(maxBufLen); + memcpy(surfaceData.Data(), map.mData, bufLen); + memset(surfaceData.Data() + bufLen, 0, maxBufLen - bufLen); + + *aLength = maxBufLen; + *aStride = map.mStride; + + aSurface.Unmap(); + return Some(std::move(surfaceData)); +} + +Maybe<IPCImage> nsContentUtils::SurfaceToIPCImage(DataSourceSurface& aSurface) { + size_t len = 0; + int32_t stride = 0; + auto mem = GetSurfaceData(aSurface, &len, &stride); + if (!mem) { + return Nothing(); + } + return Some(IPCImage{std::move(*mem), uint32_t(stride), aSurface.GetFormat(), + ImageIntSize::FromUnknownSize(aSurface.GetSize())}); +} + +already_AddRefed<DataSourceSurface> nsContentUtils::IPCImageToSurface( + IPCImage&& aImage) { + return BigBufferToDataSurface(aImage.data(), aImage.stride(), + aImage.size().ToUnknownSize(), aImage.format()); +} + +Modifiers nsContentUtils::GetWidgetModifiers(int32_t aModifiers) { + Modifiers result = 0; + if (aModifiers & nsIDOMWindowUtils::MODIFIER_SHIFT) { + result |= mozilla::MODIFIER_SHIFT; + } + if (aModifiers & nsIDOMWindowUtils::MODIFIER_CONTROL) { + result |= mozilla::MODIFIER_CONTROL; + } + if (aModifiers & nsIDOMWindowUtils::MODIFIER_ALT) { + result |= mozilla::MODIFIER_ALT; + } + if (aModifiers & nsIDOMWindowUtils::MODIFIER_META) { + result |= mozilla::MODIFIER_META; + } + if (aModifiers & nsIDOMWindowUtils::MODIFIER_ALTGRAPH) { + result |= mozilla::MODIFIER_ALTGRAPH; + } + if (aModifiers & nsIDOMWindowUtils::MODIFIER_CAPSLOCK) { + result |= mozilla::MODIFIER_CAPSLOCK; + } + if (aModifiers & nsIDOMWindowUtils::MODIFIER_FN) { + result |= mozilla::MODIFIER_FN; + } + if (aModifiers & nsIDOMWindowUtils::MODIFIER_FNLOCK) { + result |= mozilla::MODIFIER_FNLOCK; + } + if (aModifiers & nsIDOMWindowUtils::MODIFIER_NUMLOCK) { + result |= mozilla::MODIFIER_NUMLOCK; + } + if (aModifiers & nsIDOMWindowUtils::MODIFIER_SCROLLLOCK) { + result |= mozilla::MODIFIER_SCROLLLOCK; + } + if (aModifiers & nsIDOMWindowUtils::MODIFIER_SYMBOL) { + result |= mozilla::MODIFIER_SYMBOL; + } + if (aModifiers & nsIDOMWindowUtils::MODIFIER_SYMBOLLOCK) { + result |= mozilla::MODIFIER_SYMBOLLOCK; + } + if (aModifiers & nsIDOMWindowUtils::MODIFIER_OS) { + result |= mozilla::MODIFIER_OS; + } + return result; +} + +nsIWidget* nsContentUtils::GetWidget(PresShell* aPresShell, nsPoint* aOffset) { + if (!aPresShell) { + return nullptr; + } + nsIFrame* frame = aPresShell->GetRootFrame(); + if (!frame) { + return nullptr; + } + return frame->GetView()->GetNearestWidget(aOffset); +} + +int16_t nsContentUtils::GetButtonsFlagForButton(int32_t aButton) { + switch (aButton) { + case -1: + return MouseButtonsFlag::eNoButtons; + case MouseButton::ePrimary: + return MouseButtonsFlag::ePrimaryFlag; + case MouseButton::eMiddle: + return MouseButtonsFlag::eMiddleFlag; + case MouseButton::eSecondary: + return MouseButtonsFlag::eSecondaryFlag; + case 3: + return MouseButtonsFlag::e4thFlag; + case 4: + return MouseButtonsFlag::e5thFlag; + case MouseButton::eEraser: + return MouseButtonsFlag::eEraserFlag; + default: + NS_ERROR("Button not known."); + return 0; + } +} + +LayoutDeviceIntPoint nsContentUtils::ToWidgetPoint( + const CSSPoint& aPoint, const nsPoint& aOffset, + nsPresContext* aPresContext) { + nsPoint layoutRelative = CSSPoint::ToAppUnits(aPoint) + aOffset; + nsPoint visualRelative = + ViewportUtils::LayoutToVisual(layoutRelative, aPresContext->PresShell()); + return LayoutDeviceIntPoint::FromAppUnitsRounded( + visualRelative, aPresContext->AppUnitsPerDevPixel()); +} + +nsView* nsContentUtils::GetViewToDispatchEvent(nsPresContext* aPresContext, + PresShell** aPresShell) { + if (!aPresContext || !aPresShell) { + return nullptr; + } + RefPtr<PresShell> presShell = aPresContext->PresShell(); + if (NS_WARN_IF(!presShell)) { + *aPresShell = nullptr; + return nullptr; + } + nsViewManager* viewManager = presShell->GetViewManager(); + if (!viewManager) { + presShell.forget(aPresShell); // XXX Is this intentional? + return nullptr; + } + presShell.forget(aPresShell); + return viewManager->GetRootView(); +} + +nsresult nsContentUtils::SendMouseEvent( + mozilla::PresShell* aPresShell, const nsAString& aType, float aX, float aY, + int32_t aButton, int32_t aButtons, int32_t aClickCount, int32_t aModifiers, + bool aIgnoreRootScrollFrame, float aPressure, + unsigned short aInputSourceArg, uint32_t aIdentifier, bool aToWindow, + PreventDefaultResult* aPreventDefault, bool aIsDOMEventSynthesized, + bool aIsWidgetEventSynthesized) { + nsPoint offset; + nsCOMPtr<nsIWidget> widget = GetWidget(aPresShell, &offset); + if (!widget) return NS_ERROR_FAILURE; + + EventMessage msg; + Maybe<WidgetMouseEvent::ExitFrom> exitFrom; + bool contextMenuKey = false; + if (aType.EqualsLiteral("mousedown")) { + msg = eMouseDown; + } else if (aType.EqualsLiteral("mouseup")) { + msg = eMouseUp; + } else if (aType.EqualsLiteral("mousemove")) { + msg = eMouseMove; + } else if (aType.EqualsLiteral("mouseover")) { + msg = eMouseEnterIntoWidget; + } else if (aType.EqualsLiteral("mouseout")) { + msg = eMouseExitFromWidget; + exitFrom = Some(WidgetMouseEvent::ePlatformChild); + } else if (aType.EqualsLiteral("mousecancel")) { + msg = eMouseExitFromWidget; + exitFrom = Some(XRE_IsParentProcess() ? WidgetMouseEvent::ePlatformTopLevel + : WidgetMouseEvent::ePuppet); + } else if (aType.EqualsLiteral("mouselongtap")) { + msg = eMouseLongTap; + } else if (aType.EqualsLiteral("contextmenu")) { + msg = eContextMenu; + contextMenuKey = (aButton == 0); + } else if (aType.EqualsLiteral("MozMouseHittest")) { + msg = eMouseHitTest; + } else if (aType.EqualsLiteral("MozMouseExploreByTouch")) { + msg = eMouseExploreByTouch; + } else { + return NS_ERROR_FAILURE; + } + + if (aInputSourceArg == MouseEvent_Binding::MOZ_SOURCE_UNKNOWN) { + aInputSourceArg = MouseEvent_Binding::MOZ_SOURCE_MOUSE; + } + + WidgetMouseEvent event(true, msg, widget, + aIsWidgetEventSynthesized + ? WidgetMouseEvent::eSynthesized + : WidgetMouseEvent::eReal, + contextMenuKey ? WidgetMouseEvent::eContextMenuKey + : WidgetMouseEvent::eNormal); + event.pointerId = aIdentifier; + event.mModifiers = GetWidgetModifiers(aModifiers); + event.mButton = aButton; + event.mButtons = aButtons != nsIDOMWindowUtils::MOUSE_BUTTONS_NOT_SPECIFIED + ? aButtons + : msg == eMouseUp ? 0 + : GetButtonsFlagForButton(aButton); + event.mPressure = aPressure; + event.mInputSource = aInputSourceArg; + event.mClickCount = aClickCount; + event.mFlags.mIsSynthesizedForTests = aIsDOMEventSynthesized; + event.mExitFrom = exitFrom; + + nsPresContext* presContext = aPresShell->GetPresContext(); + if (!presContext) return NS_ERROR_FAILURE; + + event.mRefPoint = ToWidgetPoint(CSSPoint(aX, aY), offset, presContext); + event.mIgnoreRootScrollFrame = aIgnoreRootScrollFrame; + + nsEventStatus status = nsEventStatus_eIgnore; + if (aToWindow) { + RefPtr<PresShell> presShell; + nsView* view = + GetViewToDispatchEvent(presContext, getter_AddRefs(presShell)); + if (!presShell || !view) { + return NS_ERROR_FAILURE; + } + return presShell->HandleEvent(view->GetFrame(), &event, false, &status); + } + if (StaticPrefs::test_events_async_enabled()) { + status = widget->DispatchInputEvent(&event).mContentStatus; + } else { + nsresult rv = widget->DispatchEvent(&event, status); + NS_ENSURE_SUCCESS(rv, rv); + } + if (aPreventDefault) { + if (status == nsEventStatus_eConsumeNoDefault) { + if (event.mFlags.mDefaultPreventedByContent) { + *aPreventDefault = PreventDefaultResult::ByContent; + } else { + *aPreventDefault = PreventDefaultResult::ByChrome; + } + } else { + *aPreventDefault = PreventDefaultResult::No; + } + } + + return NS_OK; +} + +/* static */ +void nsContentUtils::FirePageHideEventForFrameLoaderSwap( + nsIDocShellTreeItem* aItem, EventTarget* aChromeEventHandler, + bool aOnlySystemGroup) { + MOZ_DIAGNOSTIC_ASSERT(aItem); + MOZ_DIAGNOSTIC_ASSERT(aChromeEventHandler); + + RefPtr<Document> doc = aItem->GetDocument(); + NS_ASSERTION(doc, "What happened here?"); + doc->OnPageHide(true, aChromeEventHandler, aOnlySystemGroup); + + int32_t childCount = 0; + aItem->GetInProcessChildCount(&childCount); + AutoTArray<nsCOMPtr<nsIDocShellTreeItem>, 8> kids; + kids.AppendElements(childCount); + for (int32_t i = 0; i < childCount; ++i) { + aItem->GetInProcessChildAt(i, getter_AddRefs(kids[i])); + } + + for (uint32_t i = 0; i < kids.Length(); ++i) { + if (kids[i]) { + FirePageHideEventForFrameLoaderSwap(kids[i], aChromeEventHandler, + aOnlySystemGroup); + } + } +} + +// The pageshow event is fired for a given document only if IsShowing() returns +// the same thing as aFireIfShowing. This gives us a way to fire pageshow only +// on documents that are still loading or only on documents that are already +// loaded. +/* static */ +void nsContentUtils::FirePageShowEventForFrameLoaderSwap( + nsIDocShellTreeItem* aItem, EventTarget* aChromeEventHandler, + bool aFireIfShowing, bool aOnlySystemGroup) { + int32_t childCount = 0; + aItem->GetInProcessChildCount(&childCount); + AutoTArray<nsCOMPtr<nsIDocShellTreeItem>, 8> kids; + kids.AppendElements(childCount); + for (int32_t i = 0; i < childCount; ++i) { + aItem->GetInProcessChildAt(i, getter_AddRefs(kids[i])); + } + + for (uint32_t i = 0; i < kids.Length(); ++i) { + if (kids[i]) { + FirePageShowEventForFrameLoaderSwap(kids[i], aChromeEventHandler, + aFireIfShowing, aOnlySystemGroup); + } + } + + RefPtr<Document> doc = aItem->GetDocument(); + if (doc && doc->IsShowing() == aFireIfShowing) { + doc->OnPageShow(true, aChromeEventHandler, aOnlySystemGroup); + } +} + +/* static */ +already_AddRefed<nsPIWindowRoot> nsContentUtils::GetWindowRoot(Document* aDoc) { + if (aDoc) { + if (nsPIDOMWindowOuter* win = aDoc->GetWindow()) { + return win->GetTopWindowRoot(); + } + } + return nullptr; +} + +/* static */ +bool nsContentUtils::LinkContextIsURI(const nsAString& aAnchor, + nsIURI* aDocURI) { + if (aAnchor.IsEmpty()) { + // anchor parameter not present or empty -> same document reference + return true; + } + + // the document URI might contain a fragment identifier ("#...') + // we want to ignore that because it's invisible to the server + // and just affects the local interpretation in the recipient + nsCOMPtr<nsIURI> contextUri; + nsresult rv = NS_GetURIWithoutRef(aDocURI, getter_AddRefs(contextUri)); + + if (NS_FAILED(rv)) { + // copying failed + return false; + } + + // resolve anchor against context + nsCOMPtr<nsIURI> resolvedUri; + rv = NS_NewURI(getter_AddRefs(resolvedUri), aAnchor, nullptr, contextUri); + + if (NS_FAILED(rv)) { + // resolving failed + return false; + } + + bool same; + rv = contextUri->Equals(resolvedUri, &same); + if (NS_FAILED(rv)) { + // comparison failed + return false; + } + + return same; +} + +/* static */ +bool nsContentUtils::IsPreloadType(nsContentPolicyType aType) { + return (aType == nsIContentPolicy::TYPE_INTERNAL_SCRIPT_PRELOAD || + aType == nsIContentPolicy::TYPE_INTERNAL_MODULE_PRELOAD || + aType == nsIContentPolicy::TYPE_INTERNAL_IMAGE_PRELOAD || + aType == nsIContentPolicy::TYPE_INTERNAL_STYLESHEET_PRELOAD || + aType == nsIContentPolicy::TYPE_INTERNAL_FONT_PRELOAD || + aType == nsIContentPolicy::TYPE_INTERNAL_FETCH_PRELOAD); +} + +// static +ReferrerPolicy nsContentUtils::GetReferrerPolicyFromChannel( + nsIChannel* aChannel) { + nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aChannel); + if (!httpChannel) { + return ReferrerPolicy::_empty; + } + + nsresult rv; + nsAutoCString headerValue; + rv = httpChannel->GetResponseHeader("referrer-policy"_ns, headerValue); + if (NS_FAILED(rv) || headerValue.IsEmpty()) { + return ReferrerPolicy::_empty; + } + + return ReferrerInfo::ReferrerPolicyFromHeaderString( + NS_ConvertUTF8toUTF16(headerValue)); +} + +// static +bool nsContentUtils::IsNonSubresourceRequest(nsIChannel* aChannel) { + nsLoadFlags loadFlags = 0; + aChannel->GetLoadFlags(&loadFlags); + if (loadFlags & nsIChannel::LOAD_DOCUMENT_URI) { + return true; + } + + nsCOMPtr<nsILoadInfo> loadInfo = aChannel->LoadInfo(); + nsContentPolicyType type = loadInfo->InternalContentPolicyType(); + return IsNonSubresourceInternalPolicyType(type); +} + +// static +bool nsContentUtils::IsNonSubresourceInternalPolicyType( + nsContentPolicyType aType) { + return aType == nsIContentPolicy::TYPE_DOCUMENT || + aType == nsIContentPolicy::TYPE_INTERNAL_IFRAME || + aType == nsIContentPolicy::TYPE_INTERNAL_FRAME || + aType == nsIContentPolicy::TYPE_INTERNAL_WORKER || + aType == nsIContentPolicy::TYPE_INTERNAL_SHARED_WORKER; +} + +// static public +bool nsContentUtils::IsThirdPartyTrackingResourceWindow( + nsPIDOMWindowInner* aWindow) { + MOZ_ASSERT(aWindow); + + Document* document = aWindow->GetExtantDoc(); + if (!document) { + return false; + } + + nsCOMPtr<nsIClassifiedChannel> classifiedChannel = + do_QueryInterface(document->GetChannel()); + if (!classifiedChannel) { + return false; + } + + return classifiedChannel->IsThirdPartyTrackingResource(); +} + +// static public +bool nsContentUtils::IsFirstPartyTrackingResourceWindow( + nsPIDOMWindowInner* aWindow) { + MOZ_ASSERT(aWindow); + + Document* document = aWindow->GetExtantDoc(); + if (!document) { + return false; + } + + nsCOMPtr<nsIClassifiedChannel> classifiedChannel = + do_QueryInterface(document->GetChannel()); + if (!classifiedChannel) { + return false; + } + + uint32_t classificationFlags = + classifiedChannel->GetFirstPartyClassificationFlags(); + + return mozilla::net::UrlClassifierCommon::IsTrackingClassificationFlag( + classificationFlags, NS_UsePrivateBrowsing(document->GetChannel())); +} + +namespace { + +// We put StringBuilder in the anonymous namespace to prevent anything outside +// this file from accidentally being linked against it. +class BulkAppender { + using size_type = typename nsAString::size_type; + + public: + explicit BulkAppender(BulkWriteHandle<char16_t>&& aHandle) + : mHandle(std::move(aHandle)), mPosition(0) {} + ~BulkAppender() = default; + + template <int N> + void AppendLiteral(const char16_t (&aStr)[N]) { + size_t len = N - 1; + MOZ_ASSERT(mPosition + len <= mHandle.Length()); + memcpy(mHandle.Elements() + mPosition, aStr, len * sizeof(char16_t)); + mPosition += len; + } + + void Append(Span<const char16_t> aStr) { + size_t len = aStr.Length(); + MOZ_ASSERT(mPosition + len <= mHandle.Length()); + // Both mHandle.Elements() and aStr.Elements() are guaranteed + // to be non-null (by the string implementation and by Span, + // respectively), so not checking the pointers for null before + // memcpy does not lead to UB even if len was zero. + memcpy(mHandle.Elements() + mPosition, aStr.Elements(), + len * sizeof(char16_t)); + mPosition += len; + } + + void Append(Span<const char> aStr) { + size_t len = aStr.Length(); + MOZ_ASSERT(mPosition + len <= mHandle.Length()); + ConvertLatin1toUtf16(aStr, mHandle.AsSpan().From(mPosition)); + mPosition += len; + } + + void Finish() { mHandle.Finish(mPosition, false); } + + private: + BulkWriteHandle<char16_t> mHandle; + size_type mPosition; +}; + +class StringBuilder { + private: + class Unit { + public: + Unit() : mAtom(nullptr) { MOZ_COUNT_CTOR(StringBuilder::Unit); } + ~Unit() { + if (mType == Type::String || mType == Type::StringWithEncode) { + mString.~nsString(); + } + MOZ_COUNT_DTOR(StringBuilder::Unit); + } + + enum class Type : uint8_t { + Unknown, + Atom, + String, + StringWithEncode, + Literal, + TextFragment, + TextFragmentWithEncode, + }; + + union { + nsAtom* mAtom; + const char16_t* mLiteral; + nsString mString; + const nsTextFragment* mTextFragment; + }; + uint32_t mLength = 0; + Type mType = Type::Unknown; + }; + + static_assert(sizeof(void*) != 8 || sizeof(Unit) <= 3 * sizeof(void*), + "Unit should remain small"); + + public: + // Try to keep the size of StringBuilder close to a jemalloc bucket size (the + // 16kb one in this case). + static constexpr uint32_t TARGET_SIZE = 16 * 1024; + + // The number of units we need to remove from the inline buffer so that the + // rest of the builder members fit. A more precise approach would be to + // calculate that extra size and use (TARGET_SIZE - OTHER_SIZE) / sizeof(Unit) + // or so, but this is simpler. + static constexpr uint32_t PADDING_UNITS = sizeof(void*) == 8 ? 1 : 2; + + static constexpr uint32_t STRING_BUFFER_UNITS = + TARGET_SIZE / sizeof(Unit) - PADDING_UNITS; + + StringBuilder() : mLast(this), mLength(0) { MOZ_COUNT_CTOR(StringBuilder); } + + MOZ_COUNTED_DTOR(StringBuilder) + + void Append(nsAtom* aAtom) { + Unit* u = AddUnit(); + u->mAtom = aAtom; + u->mType = Unit::Type::Atom; + uint32_t len = aAtom->GetLength(); + u->mLength = len; + mLength += len; + } + + template <int N> + void Append(const char16_t (&aLiteral)[N]) { + Unit* u = AddUnit(); + u->mLiteral = aLiteral; + u->mType = Unit::Type::Literal; + uint32_t len = N - 1; + u->mLength = len; + mLength += len; + } + + void Append(nsString&& aString) { + Unit* u = AddUnit(); + uint32_t len = aString.Length(); + new (&u->mString) nsString(std::move(aString)); + u->mType = Unit::Type::String; + u->mLength = len; + mLength += len; + } + + void AppendWithAttrEncode(nsString&& aString, uint32_t aLen) { + Unit* u = AddUnit(); + new (&u->mString) nsString(std::move(aString)); + u->mType = Unit::Type::StringWithEncode; + u->mLength = aLen; + mLength += aLen; + } + + void Append(const nsTextFragment* aTextFragment) { + Unit* u = AddUnit(); + u->mTextFragment = aTextFragment; + u->mType = Unit::Type::TextFragment; + uint32_t len = aTextFragment->GetLength(); + u->mLength = len; + mLength += len; + } + + void AppendWithEncode(const nsTextFragment* aTextFragment, uint32_t aLen) { + Unit* u = AddUnit(); + u->mTextFragment = aTextFragment; + u->mType = Unit::Type::TextFragmentWithEncode; + u->mLength = aLen; + mLength += aLen; + } + + bool ToString(nsAString& aOut) { + if (!mLength.isValid()) { + return false; + } + auto appenderOrErr = aOut.BulkWrite(mLength.value(), 0, true); + if (appenderOrErr.isErr()) { + return false; + } + + BulkAppender appender{appenderOrErr.unwrap()}; + + for (StringBuilder* current = this; current; + current = current->mNext.get()) { + uint32_t len = current->mUnits.Length(); + for (uint32_t i = 0; i < len; ++i) { + Unit& u = current->mUnits[i]; + switch (u.mType) { + case Unit::Type::Atom: + appender.Append(*(u.mAtom)); + break; + case Unit::Type::String: + appender.Append(u.mString); + break; + case Unit::Type::StringWithEncode: + EncodeAttrString(u.mString, appender); + break; + case Unit::Type::Literal: + appender.Append(Span(u.mLiteral, u.mLength)); + break; + case Unit::Type::TextFragment: + if (u.mTextFragment->Is2b()) { + appender.Append( + Span(u.mTextFragment->Get2b(), u.mTextFragment->GetLength())); + } else { + appender.Append( + Span(u.mTextFragment->Get1b(), u.mTextFragment->GetLength())); + } + break; + case Unit::Type::TextFragmentWithEncode: + if (u.mTextFragment->Is2b()) { + EncodeTextFragment( + Span(u.mTextFragment->Get2b(), u.mTextFragment->GetLength()), + appender); + } else { + EncodeTextFragment( + Span(u.mTextFragment->Get1b(), u.mTextFragment->GetLength()), + appender); + } + break; + default: + MOZ_CRASH("Unknown unit type?"); + } + } + } + appender.Finish(); + return true; + } + + private: + Unit* AddUnit() { + if (mLast->mUnits.Length() == STRING_BUFFER_UNITS) { + new StringBuilder(this); + } + return mLast->mUnits.AppendElement(); + } + + explicit StringBuilder(StringBuilder* aFirst) : mLast(nullptr), mLength(0) { + MOZ_COUNT_CTOR(StringBuilder); + aFirst->mLast->mNext = WrapUnique(this); + aFirst->mLast = this; + } + + void EncodeAttrString(Span<const char16_t> aStr, BulkAppender& aAppender) { + size_t flushedUntil = 0; + size_t currentPosition = 0; + for (char16_t c : aStr) { + switch (c) { + case '"': + aAppender.Append(aStr.FromTo(flushedUntil, currentPosition)); + aAppender.AppendLiteral(u"""); + flushedUntil = currentPosition + 1; + break; + case '&': + aAppender.Append(aStr.FromTo(flushedUntil, currentPosition)); + aAppender.AppendLiteral(u"&"); + flushedUntil = currentPosition + 1; + break; + case 0x00A0: + aAppender.Append(aStr.FromTo(flushedUntil, currentPosition)); + aAppender.AppendLiteral(u" "); + flushedUntil = currentPosition + 1; + break; + default: + break; + } + currentPosition++; + } + if (currentPosition > flushedUntil) { + aAppender.Append(aStr.FromTo(flushedUntil, currentPosition)); + } + } + + template <class T> + void EncodeTextFragment(Span<const T> aStr, BulkAppender& aAppender) { + size_t flushedUntil = 0; + size_t currentPosition = 0; + for (T c : aStr) { + switch (c) { + case '<': + aAppender.Append(aStr.FromTo(flushedUntil, currentPosition)); + aAppender.AppendLiteral(u"<"); + flushedUntil = currentPosition + 1; + break; + case '>': + aAppender.Append(aStr.FromTo(flushedUntil, currentPosition)); + aAppender.AppendLiteral(u">"); + flushedUntil = currentPosition + 1; + break; + case '&': + aAppender.Append(aStr.FromTo(flushedUntil, currentPosition)); + aAppender.AppendLiteral(u"&"); + flushedUntil = currentPosition + 1; + break; + case T(0xA0): + aAppender.Append(aStr.FromTo(flushedUntil, currentPosition)); + aAppender.AppendLiteral(u" "); + flushedUntil = currentPosition + 1; + break; + default: + break; + } + currentPosition++; + } + if (currentPosition > flushedUntil) { + aAppender.Append(aStr.FromTo(flushedUntil, currentPosition)); + } + } + + AutoTArray<Unit, STRING_BUFFER_UNITS> mUnits; + UniquePtr<StringBuilder> mNext; + StringBuilder* mLast; + // mLength is used only in the first StringBuilder object in the linked list. + CheckedInt<uint32_t> mLength; +}; + +static_assert(sizeof(StringBuilder) <= StringBuilder::TARGET_SIZE, + "StringBuilder should fit in the target bucket"); + +} // namespace + +static void AppendEncodedCharacters(const nsTextFragment* aText, + StringBuilder& aBuilder) { + uint32_t extraSpaceNeeded = 0; + uint32_t len = aText->GetLength(); + if (aText->Is2b()) { + const char16_t* data = aText->Get2b(); + for (uint32_t i = 0; i < len; ++i) { + const char16_t c = data[i]; + switch (c) { + case '<': + extraSpaceNeeded += ArrayLength("<") - 2; + break; + case '>': + extraSpaceNeeded += ArrayLength(">") - 2; + break; + case '&': + extraSpaceNeeded += ArrayLength("&") - 2; + break; + case 0x00A0: + extraSpaceNeeded += ArrayLength(" ") - 2; + break; + default: + break; + } + } + } else { + const char* data = aText->Get1b(); + for (uint32_t i = 0; i < len; ++i) { + const unsigned char c = data[i]; + switch (c) { + case '<': + extraSpaceNeeded += ArrayLength("<") - 2; + break; + case '>': + extraSpaceNeeded += ArrayLength(">") - 2; + break; + case '&': + extraSpaceNeeded += ArrayLength("&") - 2; + break; + case 0x00A0: + extraSpaceNeeded += ArrayLength(" ") - 2; + break; + default: + break; + } + } + } + + if (extraSpaceNeeded) { + aBuilder.AppendWithEncode(aText, len + extraSpaceNeeded); + } else { + aBuilder.Append(aText); + } +} + +static uint32_t ExtraSpaceNeededForAttrEncoding(const nsAString& aValue) { + const char16_t* c = aValue.BeginReading(); + const char16_t* end = aValue.EndReading(); + + uint32_t extraSpaceNeeded = 0; + while (c < end) { + switch (*c) { + case '"': + extraSpaceNeeded += ArrayLength(""") - 2; + break; + case '&': + extraSpaceNeeded += ArrayLength("&") - 2; + break; + case 0x00A0: + extraSpaceNeeded += ArrayLength(" ") - 2; + break; + default: + break; + } + ++c; + } + + return extraSpaceNeeded; +} + +static void AppendEncodedAttributeValue(const nsAttrValue& aValue, + StringBuilder& aBuilder) { + if (nsAtom* atom = aValue.GetStoredAtom()) { + nsDependentAtomString atomStr(atom); + uint32_t space = ExtraSpaceNeededForAttrEncoding(atomStr); + if (!space) { + aBuilder.Append(atom); + } else { + aBuilder.AppendWithAttrEncode(nsString(atomStr), + atomStr.Length() + space); + } + return; + } + // NOTE(emilio): In most cases this will just be a reference to the stored + // nsStringBuffer. + nsString str; + aValue.ToString(str); + uint32_t space = ExtraSpaceNeededForAttrEncoding(str); + if (space) { + aBuilder.AppendWithAttrEncode(std::move(str), str.Length() + space); + } else { + aBuilder.Append(std::move(str)); + } +} + +static void StartElement(Element* aElement, StringBuilder& aBuilder) { + nsAtom* localName = aElement->NodeInfo()->NameAtom(); + const int32_t tagNS = aElement->GetNameSpaceID(); + + aBuilder.Append(u"<"); + if (tagNS == kNameSpaceID_XHTML || tagNS == kNameSpaceID_SVG || + tagNS == kNameSpaceID_MathML) { + aBuilder.Append(localName); + } else { + aBuilder.Append(nsString(aElement->NodeName())); + } + + if (CustomElementData* ceData = aElement->GetCustomElementData()) { + nsAtom* isAttr = ceData->GetIs(aElement); + if (isAttr && !aElement->HasAttr(nsGkAtoms::is)) { + aBuilder.Append(uR"( is=")"); + aBuilder.Append(isAttr); + aBuilder.Append(uR"(")"); + } + } + + uint32_t i = 0; + while (BorrowedAttrInfo info = aElement->GetAttrInfoAt(i++)) { + const nsAttrName* name = info.mName; + + int32_t attNs = name->NamespaceID(); + nsAtom* attName = name->LocalName(); + + // Filter out any attribute starting with [-|_]moz + // FIXME(emilio): Do we still need this? + nsDependentAtomString attrNameStr(attName); + if (StringBeginsWith(attrNameStr, u"_moz"_ns) || + StringBeginsWith(attrNameStr, u"-moz"_ns)) { + continue; + } + + aBuilder.Append(u" "); + + if (MOZ_LIKELY(attNs == kNameSpaceID_None) || + (attNs == kNameSpaceID_XMLNS && attName == nsGkAtoms::xmlns)) { + // Nothing else required + } else if (attNs == kNameSpaceID_XML) { + aBuilder.Append(u"xml:"); + } else if (attNs == kNameSpaceID_XMLNS) { + aBuilder.Append(u"xmlns:"); + } else if (attNs == kNameSpaceID_XLink) { + aBuilder.Append(u"xlink:"); + } else if (nsAtom* prefix = name->GetPrefix()) { + aBuilder.Append(prefix); + aBuilder.Append(u":"); + } + + aBuilder.Append(attName); + aBuilder.Append(uR"(=")"); + AppendEncodedAttributeValue(*info.mValue, aBuilder); + aBuilder.Append(uR"(")"); + } + + aBuilder.Append(u">"); + + /* + // Per HTML spec we should append one \n if the first child of + // pre/textarea/listing is a textnode and starts with a \n. + // But because browsers haven't traditionally had that behavior, + // we're not changing our behavior either - yet. + if (aContent->IsHTMLElement()) { + if (localName == nsGkAtoms::pre || localName == nsGkAtoms::textarea || + localName == nsGkAtoms::listing) { + nsIContent* fc = aContent->GetFirstChild(); + if (fc && + (fc->NodeType() == nsINode::TEXT_NODE || + fc->NodeType() == nsINode::CDATA_SECTION_NODE)) { + const nsTextFragment* text = fc->GetText(); + if (text && text->GetLength() && text->CharAt(0) == char16_t('\n')) { + aBuilder.Append("\n"); + } + } + } + }*/ +} + +static inline bool ShouldEscape(nsIContent* aParent) { + if (!aParent || !aParent->IsHTMLElement()) { + return true; + } + + static const nsAtom* nonEscapingElements[] = { + nsGkAtoms::style, nsGkAtoms::script, nsGkAtoms::xmp, + nsGkAtoms::iframe, nsGkAtoms::noembed, nsGkAtoms::noframes, + nsGkAtoms::plaintext, nsGkAtoms::noscript}; + static mozilla::BitBloomFilter<12, nsAtom> sFilter; + static bool sInitialized = false; + if (!sInitialized) { + sInitialized = true; + for (auto& nonEscapingElement : nonEscapingElements) { + sFilter.add(nonEscapingElement); + } + } + + nsAtom* tag = aParent->NodeInfo()->NameAtom(); + if (sFilter.mightContain(tag)) { + for (auto& nonEscapingElement : nonEscapingElements) { + if (tag == nonEscapingElement) { + if (MOZ_UNLIKELY(tag == nsGkAtoms::noscript) && + MOZ_UNLIKELY(!aParent->OwnerDoc()->IsScriptEnabled())) { + return true; + } + return false; + } + } + } + return true; +} + +static inline bool IsVoidTag(Element* aElement) { + if (!aElement->IsHTMLElement()) { + return false; + } + return FragmentOrElement::IsHTMLVoid(aElement->NodeInfo()->NameAtom()); +} + +bool nsContentUtils::SerializeNodeToMarkup(nsINode* aRoot, + bool aDescendantsOnly, + nsAString& aOut) { + // If you pass in a DOCUMENT_NODE, you must pass aDescendentsOnly as true + MOZ_ASSERT(aDescendantsOnly || aRoot->NodeType() != nsINode::DOCUMENT_NODE); + + nsINode* current = + aDescendantsOnly ? aRoot->GetFirstChildOfTemplateOrNode() : aRoot; + + if (!current) { + return true; + } + + StringBuilder builder; + nsIContent* next; + while (true) { + bool isVoid = false; + switch (current->NodeType()) { + case nsINode::ELEMENT_NODE: { + Element* elem = current->AsElement(); + StartElement(elem, builder); + isVoid = IsVoidTag(elem); + if (!isVoid && (next = current->GetFirstChildOfTemplateOrNode())) { + current = next; + continue; + } + break; + } + + case nsINode::TEXT_NODE: + case nsINode::CDATA_SECTION_NODE: { + const nsTextFragment* text = ¤t->AsText()->TextFragment(); + nsIContent* parent = current->GetParent(); + if (ShouldEscape(parent)) { + AppendEncodedCharacters(text, builder); + } else { + builder.Append(text); + } + break; + } + + case nsINode::COMMENT_NODE: { + builder.Append(u"<!--"); + builder.Append(static_cast<nsIContent*>(current)->GetText()); + builder.Append(u"-->"); + break; + } + + case nsINode::DOCUMENT_TYPE_NODE: { + builder.Append(u"<!DOCTYPE "); + builder.Append(nsString(current->NodeName())); + builder.Append(u">"); + break; + } + + case nsINode::PROCESSING_INSTRUCTION_NODE: { + builder.Append(u"<?"); + builder.Append(nsString(current->NodeName())); + builder.Append(u" "); + builder.Append(static_cast<nsIContent*>(current)->GetText()); + builder.Append(u">"); + break; + } + } + + while (true) { + if (!isVoid && current->NodeType() == nsINode::ELEMENT_NODE) { + builder.Append(u"</"); + nsIContent* elem = static_cast<nsIContent*>(current); + if (elem->IsHTMLElement() || elem->IsSVGElement() || + elem->IsMathMLElement()) { + builder.Append(elem->NodeInfo()->NameAtom()); + } else { + builder.Append(nsString(current->NodeName())); + } + builder.Append(u">"); + } + isVoid = false; + + if (current == aRoot) { + return builder.ToString(aOut); + } + + if ((next = current->GetNextSibling())) { + current = next; + break; + } + + current = current->GetParentNode(); + + // Handle template element. If the parent is a template's content, + // then adjust the parent to be the template element. + if (current != aRoot && + current->NodeType() == nsINode::DOCUMENT_FRAGMENT_NODE) { + DocumentFragment* frag = static_cast<DocumentFragment*>(current); + nsIContent* fragHost = frag->GetHost(); + if (fragHost && fragHost->IsTemplateElement()) { + current = fragHost; + } + } + + if (aDescendantsOnly && current == aRoot) { + return builder.ToString(aOut); + } + } + } +} + +bool nsContentUtils::IsSpecificAboutPage(JSObject* aGlobal, const char* aUri) { + // aUri must start with about: or this isn't the right function to be using. + MOZ_ASSERT(strncmp(aUri, "about:", 6) == 0); + + // Make sure the global is a window + MOZ_DIAGNOSTIC_ASSERT(JS_IsGlobalObject(aGlobal)); + nsGlobalWindowInner* win = xpc::WindowOrNull(aGlobal); + if (!win) { + return false; + } + + nsCOMPtr<nsIPrincipal> principal = win->GetPrincipal(); + NS_ENSURE_TRUE(principal, false); + + // First check the scheme to avoid getting long specs in the common case. + if (!principal->SchemeIs("about")) { + return false; + } + + nsAutoCString spec; + principal->GetAsciiSpec(spec); + + return spec.EqualsASCII(aUri); +} + +/* static */ +void nsContentUtils::SetScrollbarsVisibility(nsIDocShell* aDocShell, + bool aVisible) { + if (!aDocShell) { + return; + } + auto pref = aVisible ? ScrollbarPreference::Auto : ScrollbarPreference::Never; + nsDocShell::Cast(aDocShell)->SetScrollbarPreference(pref); +} + +/* static */ +nsIDocShell* nsContentUtils::GetDocShellForEventTarget(EventTarget* aTarget) { + if (!aTarget) { + return nullptr; + } + + nsCOMPtr<nsPIDOMWindowInner> innerWindow; + if (nsCOMPtr<nsINode> node = nsINode::FromEventTarget(aTarget)) { + bool ignore; + innerWindow = + do_QueryInterface(node->OwnerDoc()->GetScriptHandlingObject(ignore)); + } else if ((innerWindow = nsPIDOMWindowInner::FromEventTarget(aTarget))) { + // Nothing else to do + } else { + nsCOMPtr<DOMEventTargetHelper> helper = do_QueryInterface(aTarget); + if (helper) { + innerWindow = helper->GetOwner(); + } + } + + if (innerWindow) { + return innerWindow->GetDocShell(); + } + + return nullptr; +} + +/* + * Note: this function only relates to figuring out HTTPS state, which is an + * input to the Secure Context algorithm. We are not actually implementing any + * part of the Secure Context algorithm itself here. + * + * This is a bit of a hack. Ideally we'd propagate HTTPS state through + * nsIChannel as described in the Fetch and HTML specs, but making channels + * know about whether they should inherit HTTPS state, propagating information + * about who the channel's "client" is, exposing GetHttpsState API on channels + * and modifying the various cache implementations to store and retrieve HTTPS + * state involves a huge amount of code (see bug 1220687). We avoid that for + * now using this function. + * + * This function takes advantage of the observation that we can return true if + * nsIContentSecurityManager::IsOriginPotentiallyTrustworthy returns true for + * the document's origin (e.g. the origin has a scheme of 'https' or host + * 'localhost' etc.). Since we generally propagate a creator document's origin + * onto data:, blob:, etc. documents, this works for them too. + * + * The scenario where this observation breaks down is sandboxing without the + * 'allow-same-origin' flag, since in this case a document is given a unique + * origin (IsOriginPotentiallyTrustworthy would return false). We handle that + * by using the origin that the document would have had had it not been + * sandboxed. + * + * DEFICIENCIES: Note that this function uses nsIScriptSecurityManager's + * getChannelResultPrincipalIfNotSandboxed, and that method's ignoring of + * sandboxing is limited to the immediate sandbox. In the case that aDocument + * should inherit its origin (e.g. data: URI) but its parent has ended up + * with a unique origin due to sandboxing further up the parent chain we may + * end up returning false when we would ideally return true (since we will + * examine the parent's origin for 'https' and not finding it.) This means + * that we may restrict the privileges of some pages unnecessarily in this + * edge case. + */ +/* static */ +bool nsContentUtils::HttpsStateIsModern(Document* aDocument) { + if (!aDocument) { + return false; + } + + nsCOMPtr<nsIPrincipal> principal = aDocument->NodePrincipal(); + + if (principal->IsSystemPrincipal()) { + return true; + } + + // If aDocument is sandboxed, try and get the principal that it would have + // been given had it not been sandboxed: + if (principal->GetIsNullPrincipal() && + (aDocument->GetSandboxFlags() & SANDBOXED_ORIGIN)) { + nsIChannel* channel = aDocument->GetChannel(); + if (channel) { + nsCOMPtr<nsIScriptSecurityManager> ssm = + nsContentUtils::GetSecurityManager(); + nsresult rv = ssm->GetChannelResultPrincipalIfNotSandboxed( + channel, getter_AddRefs(principal)); + if (NS_FAILED(rv)) { + return false; + } + if (principal->IsSystemPrincipal()) { + // If a document with the system principal is sandboxing a subdocument + // that would normally inherit the embedding element's principal (e.g. + // a srcdoc document) then the embedding document does not trust the + // content that is written to the embedded document. Unlike when the + // embedding document is https, in this case we have no indication as + // to whether the embedded document's contents are delivered securely + // or not, and the sandboxing would possibly indicate that they were + // not. To play it safe we return false here. (See bug 1162772 + // comment 73-80.) + return false; + } + } + } + + if (principal->GetIsNullPrincipal()) { + return false; + } + + MOZ_ASSERT(principal->GetIsContentPrincipal()); + + return principal->GetIsOriginPotentiallyTrustworthy(); +} + +/* static */ +bool nsContentUtils::ComputeIsSecureContext(nsIChannel* aChannel) { + MOZ_ASSERT(aChannel); + + nsCOMPtr<nsIScriptSecurityManager> ssm = nsContentUtils::GetSecurityManager(); + nsCOMPtr<nsIPrincipal> principal; + nsresult rv = ssm->GetChannelResultPrincipalIfNotSandboxed( + aChannel, getter_AddRefs(principal)); + if (NS_FAILED(rv)) { + return false; + } + + const RefPtr<nsILoadInfo> loadInfo = aChannel->LoadInfo(); + + if (principal->IsSystemPrincipal()) { + // If the load would've been sandboxed, treat this load as an untrusted + // load, as system code considers sandboxed resources insecure. + return !loadInfo->GetLoadingSandboxed(); + } + + if (principal->GetIsNullPrincipal()) { + return false; + } + + if (const RefPtr<WindowContext> windowContext = + WindowContext::GetById(loadInfo->GetInnerWindowID())) { + if (!windowContext->GetIsSecureContext()) { + return false; + } + } + + return principal->GetIsOriginPotentiallyTrustworthy(); +} + +/* static */ +void nsContentUtils::TryToUpgradeElement(Element* aElement) { + NodeInfo* nodeInfo = aElement->NodeInfo(); + RefPtr<nsAtom> typeAtom = + aElement->GetCustomElementData()->GetCustomElementType(); + + MOZ_ASSERT(nodeInfo->NameAtom()->Equals(nodeInfo->LocalName())); + CustomElementDefinition* definition = + nsContentUtils::LookupCustomElementDefinition( + nodeInfo->GetDocument(), nodeInfo->NameAtom(), + nodeInfo->NamespaceID(), typeAtom); + if (definition) { + nsContentUtils::EnqueueUpgradeReaction(aElement, definition); + } else { + // Add an unresolved custom element that is a candidate for upgrade when a + // custom element is connected to the document. + nsContentUtils::RegisterUnresolvedElement(aElement, typeAtom); + } +} + +MOZ_CAN_RUN_SCRIPT +static void DoCustomElementCreate(Element** aElement, JSContext* aCx, + Document* aDoc, NodeInfo* aNodeInfo, + CustomElementConstructor* aConstructor, + ErrorResult& aRv) { + JS::Rooted<JS::Value> constructResult(aCx); + aConstructor->Construct(&constructResult, aRv, "Custom Element Create", + CallbackFunction::eRethrowExceptions); + if (aRv.Failed()) { + return; + } + + RefPtr<Element> element; + // constructResult is an ObjectValue because construction with a callback + // always forms the return value from a JSObject. + UNWRAP_OBJECT(Element, &constructResult, element); + if (aNodeInfo->NamespaceEquals(kNameSpaceID_XHTML)) { + if (!element || !element->IsHTMLElement()) { + aRv.ThrowTypeError<MSG_DOES_NOT_IMPLEMENT_INTERFACE>("\"this\"", + "HTMLElement"); + return; + } + } else { + if (!element || !element->IsXULElement()) { + aRv.ThrowTypeError<MSG_DOES_NOT_IMPLEMENT_INTERFACE>("\"this\"", + "XULElement"); + return; + } + } + + nsAtom* localName = aNodeInfo->NameAtom(); + + if (aDoc != element->OwnerDoc() || element->GetParentNode() || + element->HasChildren() || element->GetAttrCount() || + element->NodeInfo()->NameAtom() != localName) { + aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR); + return; + } + + element.forget(aElement); +} + +/* static */ +nsresult nsContentUtils::NewXULOrHTMLElement( + Element** aResult, mozilla::dom::NodeInfo* aNodeInfo, + FromParser aFromParser, nsAtom* aIsAtom, + mozilla::dom::CustomElementDefinition* aDefinition) { + RefPtr<mozilla::dom::NodeInfo> nodeInfo = aNodeInfo; + MOZ_ASSERT(nodeInfo->NamespaceEquals(kNameSpaceID_XHTML) || + nodeInfo->NamespaceEquals(kNameSpaceID_XUL), + "Can only create XUL or XHTML elements."); + + nsAtom* name = nodeInfo->NameAtom(); + int32_t tag = eHTMLTag_unknown; + bool isCustomElementName = false; + if (nodeInfo->NamespaceEquals(kNameSpaceID_XHTML)) { + tag = nsHTMLTags::CaseSensitiveAtomTagToId(name); + isCustomElementName = + (tag == eHTMLTag_userdefined && + nsContentUtils::IsCustomElementName(name, kNameSpaceID_XHTML)); + } else { // kNameSpaceID_XUL + if (aIsAtom) { + // Make sure the customized built-in element to be constructed confirms + // to our naming requirement, i.e. [is] must be a dashed name and + // the tag name must not. + // if so, set isCustomElementName to false to kick off all the logics + // that pick up aIsAtom. + if (nsContentUtils::IsNameWithDash(aIsAtom) && + !nsContentUtils::IsNameWithDash(name)) { + isCustomElementName = false; + } else { + isCustomElementName = + nsContentUtils::IsCustomElementName(name, kNameSpaceID_XUL); + } + } else { + isCustomElementName = + nsContentUtils::IsCustomElementName(name, kNameSpaceID_XUL); + } + } + + nsAtom* tagAtom = nodeInfo->NameAtom(); + nsAtom* typeAtom = nullptr; + bool isCustomElement = isCustomElementName || aIsAtom; + if (isCustomElement) { + typeAtom = isCustomElementName ? tagAtom : aIsAtom; + } + + MOZ_ASSERT_IF(aDefinition, isCustomElement); + + // https://dom.spec.whatwg.org/#concept-create-element + // We only handle the "synchronous custom elements flag is set" now. + // For the unset case (e.g. cloning a node), see bug 1319342 for that. + // Step 4. + RefPtr<CustomElementDefinition> definition = aDefinition; + if (isCustomElement && !definition) { + MOZ_ASSERT(nodeInfo->NameAtom()->Equals(nodeInfo->LocalName())); + definition = nsContentUtils::LookupCustomElementDefinition( + nodeInfo->GetDocument(), nodeInfo->NameAtom(), nodeInfo->NamespaceID(), + typeAtom); + } + + // It might be a problem that parser synchronously calls constructor, so filed + // bug 1378079 to figure out what we should do for parser case. + if (definition) { + /* + * Synchronous custom elements flag is determined by 3 places in spec, + * 1) create an element for a token, the flag is determined by + * "will execute script" which is not originally created + * for the HTML fragment parsing algorithm. + * 2) createElement and createElementNS, the flag is the same as + * NOT_FROM_PARSER. + * 3) clone a node, our implementation will not go into this function. + * For the unset case which is non-synchronous only applied for + * inner/outerHTML. + */ + bool synchronousCustomElements = aFromParser != dom::FROM_PARSER_FRAGMENT; + // Per discussion in https://github.com/w3c/webcomponents/issues/635, + // use entry global in those places that are called from JS APIs and use the + // node document's global object if it is called from parser. + nsIGlobalObject* global; + if (aFromParser == dom::NOT_FROM_PARSER) { + global = GetEntryGlobal(); + + // Documents created from the PrototypeDocumentSink always use + // NOT_FROM_PARSER for non-XUL elements. We can get the global from the + // document in that case. + if (!global) { + Document* doc = nodeInfo->GetDocument(); + if (doc && doc->LoadedFromPrototype()) { + global = doc->GetScopeObject(); + } + } + } else { + global = nodeInfo->GetDocument()->GetScopeObject(); + } + if (!global) { + // In browser chrome code, one may have access to a document which doesn't + // have scope object anymore. + return NS_ERROR_FAILURE; + } + + AutoAllowLegacyScriptExecution exemption; + AutoEntryScript aes(global, "create custom elements"); + JSContext* cx = aes.cx(); + ErrorResult rv; + + // Step 5. + if (definition->IsCustomBuiltIn()) { + // SetupCustomElement() should be called with an element that don't have + // CustomElementData setup, if not we will hit the assertion in + // SetCustomElementData(). + // Built-in element + if (nodeInfo->NamespaceEquals(kNameSpaceID_XHTML)) { + *aResult = + CreateHTMLElement(tag, nodeInfo.forget(), aFromParser).take(); + } else { + NS_IF_ADDREF(*aResult = nsXULElement::Construct(nodeInfo.forget())); + } + (*aResult)->SetCustomElementData(MakeUnique<CustomElementData>(typeAtom)); + if (synchronousCustomElements) { + CustomElementRegistry::Upgrade(*aResult, definition, rv); + if (rv.MaybeSetPendingException(cx)) { + aes.ReportException(); + } + } else { + nsContentUtils::EnqueueUpgradeReaction(*aResult, definition); + } + + return NS_OK; + } + + // Step 6.1. + if (synchronousCustomElements) { + definition->mPrefixStack.AppendElement(nodeInfo->GetPrefixAtom()); + RefPtr<Document> doc = nodeInfo->GetDocument(); + DoCustomElementCreate(aResult, cx, doc, nodeInfo, + MOZ_KnownLive(definition->mConstructor), rv); + if (rv.MaybeSetPendingException(cx)) { + if (nodeInfo->NamespaceEquals(kNameSpaceID_XHTML)) { + NS_IF_ADDREF(*aResult = NS_NewHTMLUnknownElement(nodeInfo.forget(), + aFromParser)); + } else { + NS_IF_ADDREF(*aResult = nsXULElement::Construct(nodeInfo.forget())); + } + (*aResult)->SetDefined(false); + } + definition->mPrefixStack.RemoveLastElement(); + return NS_OK; + } + + // Step 6.2. + if (nodeInfo->NamespaceEquals(kNameSpaceID_XHTML)) { + NS_IF_ADDREF(*aResult = + NS_NewHTMLElement(nodeInfo.forget(), aFromParser)); + } else { + NS_IF_ADDREF(*aResult = nsXULElement::Construct(nodeInfo.forget())); + } + (*aResult)->SetCustomElementData( + MakeUnique<CustomElementData>(definition->mType)); + nsContentUtils::EnqueueUpgradeReaction(*aResult, definition); + return NS_OK; + } + + if (nodeInfo->NamespaceEquals(kNameSpaceID_XHTML)) { + // Per the Custom Element specification, unknown tags that are valid custom + // element names should be HTMLElement instead of HTMLUnknownElement. + if (isCustomElementName) { + NS_IF_ADDREF(*aResult = + NS_NewHTMLElement(nodeInfo.forget(), aFromParser)); + } else { + *aResult = CreateHTMLElement(tag, nodeInfo.forget(), aFromParser).take(); + } + } else { + NS_IF_ADDREF(*aResult = nsXULElement::Construct(nodeInfo.forget())); + } + + if (!*aResult) { + return NS_ERROR_OUT_OF_MEMORY; + } + + if (isCustomElement) { + (*aResult)->SetCustomElementData(MakeUnique<CustomElementData>(typeAtom)); + nsContentUtils::RegisterCallbackUpgradeElement(*aResult, typeAtom); + } + + return NS_OK; +} + +CustomElementRegistry* nsContentUtils::GetCustomElementRegistry( + Document* aDoc) { + MOZ_ASSERT(aDoc); + + if (!aDoc->GetDocShell()) { + return nullptr; + } + + nsPIDOMWindowInner* window = aDoc->GetInnerWindow(); + if (!window) { + return nullptr; + } + + return window->CustomElements(); +} + +/* static */ +CustomElementDefinition* nsContentUtils::LookupCustomElementDefinition( + Document* aDoc, nsAtom* aNameAtom, uint32_t aNameSpaceID, + nsAtom* aTypeAtom) { + if (aNameSpaceID != kNameSpaceID_XUL && aNameSpaceID != kNameSpaceID_XHTML) { + return nullptr; + } + + RefPtr<CustomElementRegistry> registry = GetCustomElementRegistry(aDoc); + if (!registry) { + return nullptr; + } + + return registry->LookupCustomElementDefinition(aNameAtom, aNameSpaceID, + aTypeAtom); +} + +/* static */ +void nsContentUtils::RegisterCallbackUpgradeElement(Element* aElement, + nsAtom* aTypeName) { + MOZ_ASSERT(aElement); + + Document* doc = aElement->OwnerDoc(); + CustomElementRegistry* registry = GetCustomElementRegistry(doc); + if (registry) { + registry->RegisterCallbackUpgradeElement(aElement, aTypeName); + } +} + +/* static */ +void nsContentUtils::RegisterUnresolvedElement(Element* aElement, + nsAtom* aTypeName) { + MOZ_ASSERT(aElement); + + Document* doc = aElement->OwnerDoc(); + CustomElementRegistry* registry = GetCustomElementRegistry(doc); + if (registry) { + registry->RegisterUnresolvedElement(aElement, aTypeName); + } +} + +/* static */ +void nsContentUtils::UnregisterUnresolvedElement(Element* aElement) { + MOZ_ASSERT(aElement); + + nsAtom* typeAtom = aElement->GetCustomElementData()->GetCustomElementType(); + Document* doc = aElement->OwnerDoc(); + CustomElementRegistry* registry = GetCustomElementRegistry(doc); + if (registry) { + registry->UnregisterUnresolvedElement(aElement, typeAtom); + } +} + +/* static */ +void nsContentUtils::EnqueueUpgradeReaction( + Element* aElement, CustomElementDefinition* aDefinition) { + MOZ_ASSERT(aElement); + + Document* doc = aElement->OwnerDoc(); + + // No DocGroup means no custom element reactions stack. + if (!doc->GetDocGroup()) { + return; + } + + CustomElementReactionsStack* stack = + doc->GetDocGroup()->CustomElementReactionsStack(); + stack->EnqueueUpgradeReaction(aElement, aDefinition); +} + +/* static */ +void nsContentUtils::EnqueueLifecycleCallback( + ElementCallbackType aType, Element* aCustomElement, + const LifecycleCallbackArgs& aArgs, CustomElementDefinition* aDefinition) { + // No DocGroup means no custom element reactions stack. + if (!aCustomElement->OwnerDoc()->GetDocGroup()) { + return; + } + + CustomElementRegistry::EnqueueLifecycleCallback(aType, aCustomElement, aArgs, + aDefinition); +} + +/* static */ +void nsContentUtils::AppendDocumentLevelNativeAnonymousContentTo( + Document* aDocument, nsTArray<nsIContent*>& aElements) { + MOZ_ASSERT(aDocument); +#ifdef DEBUG + size_t oldLength = aElements.Length(); +#endif + + if (PresShell* presShell = aDocument->GetPresShell()) { + if (nsIFrame* scrollFrame = presShell->GetRootScrollFrame()) { + nsIAnonymousContentCreator* creator = do_QueryFrame(scrollFrame); + MOZ_ASSERT( + creator, + "scroll frame should always implement nsIAnonymousContentCreator"); + creator->AppendAnonymousContentTo(aElements, 0); + } + if (nsCanvasFrame* canvasFrame = presShell->GetCanvasFrame()) { + canvasFrame->AppendAnonymousContentTo(aElements, 0); + } + } + +#ifdef DEBUG + for (size_t i = oldLength; i < aElements.Length(); i++) { + MOZ_ASSERT( + aElements[i]->GetProperty(nsGkAtoms::docLevelNativeAnonymousContent), + "Someone here has lied, or missed to flag the node"); + } +#endif +} + +static void AppendNativeAnonymousChildrenFromFrame(nsIFrame* aFrame, + nsTArray<nsIContent*>& aKids, + uint32_t aFlags) { + if (nsIAnonymousContentCreator* ac = do_QueryFrame(aFrame)) { + ac->AppendAnonymousContentTo(aKids, aFlags); + } +} + +/* static */ +void nsContentUtils::AppendNativeAnonymousChildren(const nsIContent* aContent, + nsTArray<nsIContent*>& aKids, + uint32_t aFlags) { + if (aContent->MayHaveAnonymousChildren()) { + if (nsIFrame* primaryFrame = aContent->GetPrimaryFrame()) { + // NAC created by the element's primary frame. + AppendNativeAnonymousChildrenFromFrame(primaryFrame, aKids, aFlags); + + // NAC created by any other non-primary frames for the element. + AutoTArray<nsIFrame::OwnedAnonBox, 8> ownedAnonBoxes; + primaryFrame->AppendOwnedAnonBoxes(ownedAnonBoxes); + for (nsIFrame::OwnedAnonBox& box : ownedAnonBoxes) { + MOZ_ASSERT(box.mAnonBoxFrame->GetContent() == aContent); + AppendNativeAnonymousChildrenFromFrame(box.mAnonBoxFrame, aKids, + aFlags); + } + } + + // Get manually created NAC (editor resize handles, etc.). + if (auto nac = static_cast<ManualNACArray*>( + aContent->GetProperty(nsGkAtoms::manualNACProperty))) { + aKids.AppendElements(*nac); + } + } + + // The root scroll frame is not the primary frame of the root element. + // Detect and handle this case. + if (!(aFlags & nsIContent::eSkipDocumentLevelNativeAnonymousContent) && + aContent == aContent->OwnerDoc()->GetRootElement()) { + AppendDocumentLevelNativeAnonymousContentTo(aContent->OwnerDoc(), aKids); + } +} + +bool nsContentUtils::IsImageAvailable(nsIContent* aLoadingNode, nsIURI* aURI, + nsIPrincipal* aDefaultTriggeringPrincipal, + CORSMode aCORSMode) { + nsCOMPtr<nsIPrincipal> triggeringPrincipal; + QueryTriggeringPrincipal(aLoadingNode, aDefaultTriggeringPrincipal, + getter_AddRefs(triggeringPrincipal)); + MOZ_ASSERT(triggeringPrincipal); + + Document* doc = aLoadingNode->OwnerDoc(); + return IsImageAvailable(aURI, triggeringPrincipal, aCORSMode, doc); +} + +bool nsContentUtils::IsImageAvailable(nsIURI* aURI, + nsIPrincipal* aTriggeringPrincipal, + CORSMode aCORSMode, Document* aDoc) { + imgLoader* imgLoader = GetImgLoaderForDocument(aDoc); + return imgLoader->IsImageAvailable(aURI, aTriggeringPrincipal, aCORSMode, + aDoc); +} + +/* static */ +bool nsContentUtils::QueryTriggeringPrincipal( + nsIContent* aLoadingNode, nsIPrincipal* aDefaultPrincipal, + nsIPrincipal** aTriggeringPrincipal) { + MOZ_ASSERT(aLoadingNode); + MOZ_ASSERT(aTriggeringPrincipal); + + bool result = false; + nsCOMPtr<nsIPrincipal> loadingPrincipal = aDefaultPrincipal; + if (!loadingPrincipal) { + loadingPrincipal = aLoadingNode->NodePrincipal(); + } + + // If aLoadingNode is content, bail out early. + if (!aLoadingNode->NodePrincipal()->IsSystemPrincipal()) { + loadingPrincipal.forget(aTriggeringPrincipal); + return result; + } + + nsAutoString loadingStr; + if (aLoadingNode->IsElement()) { + aLoadingNode->AsElement()->GetAttr( + kNameSpaceID_None, nsGkAtoms::triggeringprincipal, loadingStr); + } + + // Fall back if 'triggeringprincipal' isn't specified, + if (loadingStr.IsEmpty()) { + loadingPrincipal.forget(aTriggeringPrincipal); + return result; + } + + nsCString binary; + nsCOMPtr<nsIPrincipal> serializedPrin = + BasePrincipal::FromJSON(NS_ConvertUTF16toUTF8(loadingStr)); + if (serializedPrin) { + result = true; + serializedPrin.forget(aTriggeringPrincipal); + } + + if (!result) { + // Fallback if the deserialization is failed. + loadingPrincipal.forget(aTriggeringPrincipal); + } + + return result; +} + +/* static */ +void nsContentUtils::GetContentPolicyTypeForUIImageLoading( + nsIContent* aLoadingNode, nsIPrincipal** aTriggeringPrincipal, + nsContentPolicyType& aContentPolicyType, uint64_t* aRequestContextID) { + MOZ_ASSERT(aRequestContextID); + + bool result = QueryTriggeringPrincipal(aLoadingNode, aTriggeringPrincipal); + if (result) { + // Set the content policy type to TYPE_INTERNAL_IMAGE_FAVICON for + // indicating it's a favicon loading. + aContentPolicyType = nsIContentPolicy::TYPE_INTERNAL_IMAGE_FAVICON; + + nsAutoString requestContextID; + if (aLoadingNode->IsElement()) { + aLoadingNode->AsElement()->GetAttr( + kNameSpaceID_None, nsGkAtoms::requestcontextid, requestContextID); + } + nsresult rv; + int64_t val = requestContextID.ToInteger64(&rv); + *aRequestContextID = NS_SUCCEEDED(rv) ? val : 0; + } else { + aContentPolicyType = nsIContentPolicy::TYPE_INTERNAL_IMAGE; + } +} + +/* static */ +nsresult nsContentUtils::CreateJSValueFromSequenceOfObject( + JSContext* aCx, const Sequence<JSObject*>& aTransfer, + JS::MutableHandle<JS::Value> aValue) { + if (aTransfer.IsEmpty()) { + return NS_OK; + } + + JS::Rooted<JSObject*> array(aCx, JS::NewArrayObject(aCx, aTransfer.Length())); + if (!array) { + return NS_ERROR_OUT_OF_MEMORY; + } + + for (uint32_t i = 0; i < aTransfer.Length(); ++i) { + JS::Rooted<JSObject*> object(aCx, aTransfer[i]); + if (!object) { + continue; + } + + if (NS_WARN_IF( + !JS_DefineElement(aCx, array, i, object, JSPROP_ENUMERATE))) { + return NS_ERROR_OUT_OF_MEMORY; + } + } + + aValue.setObject(*array); + return NS_OK; +} + +/* static */ +void nsContentUtils::StructuredClone(JSContext* aCx, nsIGlobalObject* aGlobal, + JS::Handle<JS::Value> aValue, + const StructuredSerializeOptions& aOptions, + JS::MutableHandle<JS::Value> aRetval, + ErrorResult& aError) { + JS::Rooted<JS::Value> transferArray(aCx, JS::UndefinedValue()); + aError = nsContentUtils::CreateJSValueFromSequenceOfObject( + aCx, aOptions.mTransfer, &transferArray); + if (NS_WARN_IF(aError.Failed())) { + return; + } + + JS::CloneDataPolicy clonePolicy; + // We are definitely staying in the same agent cluster. + clonePolicy.allowIntraClusterClonableSharedObjects(); + if (aGlobal->IsSharedMemoryAllowed()) { + clonePolicy.allowSharedMemoryObjects(); + } + + StructuredCloneHolder holder(StructuredCloneHolder::CloningSupported, + StructuredCloneHolder::TransferringSupported, + JS::StructuredCloneScope::SameProcess); + holder.Write(aCx, aValue, transferArray, clonePolicy, aError); + if (NS_WARN_IF(aError.Failed())) { + return; + } + + holder.Read(aGlobal, aCx, aRetval, clonePolicy, aError); + if (NS_WARN_IF(aError.Failed())) { + return; + } + + nsTArray<RefPtr<MessagePort>> ports = holder.TakeTransferredPorts(); + Unused << ports; +} + +/* static */ +bool nsContentUtils::ShouldBlockReservedKeys(WidgetKeyboardEvent* aKeyEvent) { + nsCOMPtr<nsIPrincipal> principal; + RefPtr<Element> targetElement = + Element::FromEventTargetOrNull(aKeyEvent->mOriginalTarget); + nsCOMPtr<nsIBrowser> targetBrowser; + if (targetElement) { + targetBrowser = targetElement->AsBrowser(); + } + bool isRemoteBrowser = false; + if (targetBrowser) { + targetBrowser->GetIsRemoteBrowser(&isRemoteBrowser); + } + + if (isRemoteBrowser) { + targetBrowser->GetContentPrincipal(getter_AddRefs(principal)); + return principal ? nsContentUtils::IsSitePermDeny(principal, "shortcuts"_ns) + : false; + } + + if (targetElement) { + Document* doc = targetElement->GetUncomposedDoc(); + if (doc) { + RefPtr<WindowContext> wc = doc->GetWindowContext(); + if (wc) { + return wc->TopWindowContext()->GetShortcutsPermission() == + nsIPermissionManager::DENY_ACTION; + } + } + } + + return false; +} + +/** + * Checks whether the given type is a supported document type for + * loading within the nsObjectLoadingContent specified by aContent. + * + * NOTE Helper method for nsContentUtils::HtmlObjectContentTypeForMIMEType. + * NOTE Does not take content policy or capabilities into account + */ +static bool HtmlObjectContentSupportsDocument(const nsCString& aMimeType) { + nsCOMPtr<nsIWebNavigationInfo> info( + do_GetService(NS_WEBNAVIGATION_INFO_CONTRACTID)); + if (!info) { + return false; + } + + uint32_t supported; + nsresult rv = info->IsTypeSupported(aMimeType, &supported); + + if (NS_FAILED(rv)) { + return false; + } + + if (supported != nsIWebNavigationInfo::UNSUPPORTED) { + // Don't want to support plugins as documents + return supported != nsIWebNavigationInfo::FALLBACK; + } + + // Try a stream converter + // NOTE: We treat any type we can convert from as a supported type. If a + // type is not actually supported, the URI loader will detect that and + // return an error, and we'll fallback. + nsCOMPtr<nsIStreamConverterService> convServ = + do_GetService("@mozilla.org/streamConverters;1"); + bool canConvert = false; + if (convServ) { + rv = convServ->CanConvert(aMimeType.get(), "*/*", &canConvert); + } + return NS_SUCCEEDED(rv) && canConvert; +} + +/* static */ +already_AddRefed<nsIPluginTag> nsContentUtils::PluginTagForType( + const nsCString& aMIMEType, bool aNoFakePlugin) { + RefPtr<nsPluginHost> pluginHost = nsPluginHost::GetInst(); + nsCOMPtr<nsIPluginTag> tag; + NS_ENSURE_TRUE(pluginHost, nullptr); + + // ShouldPlay will handle the case where the plugin is disabled + pluginHost->GetPluginTagForType( + aMIMEType, + aNoFakePlugin ? nsPluginHost::eExcludeFake : nsPluginHost::eExcludeNone, + getter_AddRefs(tag)); + + return tag.forget(); +} + +/* static */ +uint32_t nsContentUtils::HtmlObjectContentTypeForMIMEType( + const nsCString& aMIMEType, bool aNoFakePlugin) { + if (aMIMEType.IsEmpty()) { + return nsIObjectLoadingContent::TYPE_NULL; + } + + if (imgLoader::SupportImageWithMimeType(aMIMEType)) { + return ResolveObjectType(nsIObjectLoadingContent::TYPE_IMAGE); + } + + // Faking support of the PDF content as a document for EMBED tags + // when internal PDF viewer is enabled. + if (aMIMEType.LowerCaseEqualsLiteral("application/pdf") && IsPDFJSEnabled()) { + return nsIObjectLoadingContent::TYPE_DOCUMENT; + } + + if (HtmlObjectContentSupportsDocument(aMIMEType)) { + return nsIObjectLoadingContent::TYPE_DOCUMENT; + } + + bool isSpecialPlugin = nsPluginHost::GetSpecialType(aMIMEType) != + nsPluginHost::eSpecialType_None; + if (isSpecialPlugin) { + return nsIObjectLoadingContent::TYPE_FALLBACK; + } + + return nsIObjectLoadingContent::TYPE_NULL; +} + +/* static */ +already_AddRefed<nsISerialEventTarget> nsContentUtils::GetEventTargetByLoadInfo( + nsILoadInfo* aLoadInfo, TaskCategory aCategory) { + if (NS_WARN_IF(!aLoadInfo)) { + return nullptr; + } + + RefPtr<Document> doc; + aLoadInfo->GetLoadingDocument(getter_AddRefs(doc)); + nsCOMPtr<nsISerialEventTarget> target; + if (doc) { + if (DocGroup* group = doc->GetDocGroup()) { + target = group->EventTargetFor(aCategory); + } + } else { + target = GetMainThreadSerialEventTarget(); + } + + return target.forget(); +} + +/* static */ +bool nsContentUtils::IsLocalRefURL(const nsAString& aString) { + return !aString.IsEmpty() && aString[0] == '#'; +} + +// We use only 53 bits for the ID so that it can be converted to and from a JS +// value without loss of precision. The upper bits of the ID hold the process +// ID. The lower bits identify the object itself. +static constexpr uint64_t kIdTotalBits = 53; +static constexpr uint64_t kIdProcessBits = 22; +static constexpr uint64_t kIdBits = kIdTotalBits - kIdProcessBits; + +/* static */ +uint64_t nsContentUtils::GenerateProcessSpecificId(uint64_t aId) { + uint64_t processId = 0; + if (XRE_IsContentProcess()) { + ContentChild* cc = ContentChild::GetSingleton(); + processId = cc->GetID(); + } + + MOZ_RELEASE_ASSERT(processId < (uint64_t(1) << kIdProcessBits)); + uint64_t processBits = processId & ((uint64_t(1) << kIdProcessBits) - 1); + + uint64_t id = aId; + MOZ_RELEASE_ASSERT(id < (uint64_t(1) << kIdBits)); + uint64_t bits = id & ((uint64_t(1) << kIdBits) - 1); + + return (processBits << kIdBits) | bits; +} + +/* static */ +std::tuple<uint64_t, uint64_t> nsContentUtils::SplitProcessSpecificId( + uint64_t aId) { + return {aId >> kIdBits, aId & ((uint64_t(1) << kIdBits) - 1)}; +} + +// Next process-local Tab ID. +static uint64_t gNextTabId = 0; + +/* static */ +uint64_t nsContentUtils::GenerateTabId() { + return GenerateProcessSpecificId(++gNextTabId); +} + +// Next process-local Browser ID. +static uint64_t gNextBrowserId = 0; + +/* static */ +uint64_t nsContentUtils::GenerateBrowserId() { + return GenerateProcessSpecificId(++gNextBrowserId); +} + +// Next process-local Browsing Context ID. +static uint64_t gNextBrowsingContextId = 0; + +/* static */ +uint64_t nsContentUtils::GenerateBrowsingContextId() { + return GenerateProcessSpecificId(++gNextBrowsingContextId); +} + +// Next process-local Window ID. +static uint64_t gNextWindowId = 0; + +/* static */ +uint64_t nsContentUtils::GenerateWindowId() { + return GenerateProcessSpecificId(++gNextWindowId); +} + +// Next process-local load. +static Atomic<uint64_t> gNextLoadIdentifier(0); + +/* static */ +uint64_t nsContentUtils::GenerateLoadIdentifier() { + return GenerateProcessSpecificId(++gNextLoadIdentifier); +} + +/* static */ +bool nsContentUtils::GetUserIsInteracting() { + return UserInteractionObserver::sUserActive; +} + +/* static */ +bool nsContentUtils::GetSourceMapURL(nsIHttpChannel* aChannel, + nsACString& aResult) { + nsresult rv = aChannel->GetResponseHeader("SourceMap"_ns, aResult); + if (NS_FAILED(rv)) { + rv = aChannel->GetResponseHeader("X-SourceMap"_ns, aResult); + } + return NS_SUCCEEDED(rv); +} + +/* static */ +bool nsContentUtils::IsMessageInputEvent(const IPC::Message& aMsg) { + if ((aMsg.type() & mozilla::dom::PBrowser::PBrowserStart) == + mozilla::dom::PBrowser::PBrowserStart) { + switch (aMsg.type()) { + case mozilla::dom::PBrowser::Msg_RealMouseMoveEvent__ID: + case mozilla::dom::PBrowser::Msg_RealMouseButtonEvent__ID: + case mozilla::dom::PBrowser::Msg_RealMouseEnterExitWidgetEvent__ID: + case mozilla::dom::PBrowser::Msg_RealKeyEvent__ID: + case mozilla::dom::PBrowser::Msg_MouseWheelEvent__ID: + case mozilla::dom::PBrowser::Msg_RealTouchEvent__ID: + case mozilla::dom::PBrowser::Msg_RealTouchMoveEvent__ID: + case mozilla::dom::PBrowser::Msg_RealDragEvent__ID: + case mozilla::dom::PBrowser::Msg_UpdateDimensions__ID: + return true; + } + } + return false; +} + +/* static */ +bool nsContentUtils::IsMessageCriticalInputEvent(const IPC::Message& aMsg) { + if ((aMsg.type() & mozilla::dom::PBrowser::PBrowserStart) == + mozilla::dom::PBrowser::PBrowserStart) { + switch (aMsg.type()) { + case mozilla::dom::PBrowser::Msg_RealMouseButtonEvent__ID: + case mozilla::dom::PBrowser::Msg_RealKeyEvent__ID: + case mozilla::dom::PBrowser::Msg_MouseWheelEvent__ID: + case mozilla::dom::PBrowser::Msg_RealTouchEvent__ID: + case mozilla::dom::PBrowser::Msg_RealDragEvent__ID: + return true; + } + } + return false; +} + +static const char* kUserInteractionInactive = "user-interaction-inactive"; +static const char* kUserInteractionActive = "user-interaction-active"; + +void nsContentUtils::UserInteractionObserver::Init() { + // Listen for the observer messages from EventStateManager which are telling + // us whether or not the user is interacting. + nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService(); + obs->AddObserver(this, kUserInteractionInactive, false); + obs->AddObserver(this, kUserInteractionActive, false); + + // We can't register ourselves as an annotator yet, as the + // BackgroundHangMonitor hasn't started yet. It will have started by the + // time we have the chance to spin the event loop. + RefPtr<UserInteractionObserver> self = this; + NS_DispatchToMainThread(NS_NewRunnableFunction( + "nsContentUtils::UserInteractionObserver::Init", + [=]() { BackgroundHangMonitor::RegisterAnnotator(*self); })); +} + +void nsContentUtils::UserInteractionObserver::Shutdown() { + nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService(); + if (obs) { + obs->RemoveObserver(this, kUserInteractionInactive); + obs->RemoveObserver(this, kUserInteractionActive); + } + + BackgroundHangMonitor::UnregisterAnnotator(*this); +} + +/** + * NB: This function is always called by the BackgroundHangMonitor thread. + * Plan accordingly + */ +void nsContentUtils::UserInteractionObserver::AnnotateHang( + BackgroundHangAnnotations& aAnnotations) { + // NOTE: Only annotate the hang report if the user is known to be interacting. + if (sUserActive) { + aAnnotations.AddAnnotation(u"UserInteracting"_ns, true); + } +} + +NS_IMETHODIMP +nsContentUtils::UserInteractionObserver::Observe(nsISupports* aSubject, + const char* aTopic, + const char16_t* aData) { + if (!strcmp(aTopic, kUserInteractionInactive)) { + if (sUserActive && XRE_IsParentProcess()) { + glean::RecordPowerMetrics(); + } + sUserActive = false; + } else if (!strcmp(aTopic, kUserInteractionActive)) { + if (!sUserActive && XRE_IsParentProcess()) { + glean::RecordPowerMetrics(); + + nsCOMPtr<nsIUserIdleServiceInternal> idleService = + do_GetService("@mozilla.org/widget/useridleservice;1"); + if (idleService) { + idleService->ResetIdleTimeOut(0); + } + } + + sUserActive = true; + } else { + NS_WARNING("Unexpected observer notification"); + } + return NS_OK; +} + +Atomic<bool> nsContentUtils::UserInteractionObserver::sUserActive(false); +NS_IMPL_ISUPPORTS(nsContentUtils::UserInteractionObserver, nsIObserver) + +/* static */ +bool nsContentUtils::IsSpecialName(const nsAString& aName) { + return aName.LowerCaseEqualsLiteral("_blank") || + aName.LowerCaseEqualsLiteral("_top") || + aName.LowerCaseEqualsLiteral("_parent") || + aName.LowerCaseEqualsLiteral("_self"); +} + +/* static */ +bool nsContentUtils::IsOverridingWindowName(const nsAString& aName) { + return !aName.IsEmpty() && !IsSpecialName(aName); +} + +// Unfortunately, we can't unwrap an IDL object using only a concrete type. +// We need to calculate type data based on the IDL typename. Which means +// wrapping our templated function in a macro. +#define EXTRACT_EXN_VALUES(T, ...) \ + ExtractExceptionValues<mozilla::dom::prototypes::id::T, \ + T##_Binding::NativeType, T>(__VA_ARGS__) \ + .isOk() + +template <prototypes::ID PrototypeID, class NativeType, typename T> +static Result<Ok, nsresult> ExtractExceptionValues( + JSContext* aCx, JS::Handle<JSObject*> aObj, nsAString& aSourceSpecOut, + uint32_t* aLineOut, uint32_t* aColumnOut, nsString& aMessageOut) { + AssertStaticUnwrapOK<PrototypeID>(); + RefPtr<T> exn; + MOZ_TRY((UnwrapObject<PrototypeID, NativeType>(aObj, exn, nullptr))); + + exn->GetFilename(aCx, aSourceSpecOut); + if (!aSourceSpecOut.IsEmpty()) { + *aLineOut = exn->LineNumber(aCx); + *aColumnOut = exn->ColumnNumber(); + } + + exn->GetName(aMessageOut); + aMessageOut.AppendLiteral(": "); + + nsAutoString message; + exn->GetMessageMoz(message); + aMessageOut.Append(message); + return Ok(); +} + +/* static */ +void nsContentUtils::ExtractErrorValues( + JSContext* aCx, JS::Handle<JS::Value> aValue, nsACString& aSourceSpecOut, + uint32_t* aLineOut, uint32_t* aColumnOut, nsString& aMessageOut) { + nsAutoString sourceSpec; + ExtractErrorValues(aCx, aValue, sourceSpec, aLineOut, aColumnOut, + aMessageOut); + CopyUTF16toUTF8(sourceSpec, aSourceSpecOut); +} + +/* static */ +void nsContentUtils::ExtractErrorValues( + JSContext* aCx, JS::Handle<JS::Value> aValue, nsAString& aSourceSpecOut, + uint32_t* aLineOut, uint32_t* aColumnOut, nsString& aMessageOut) { + MOZ_ASSERT(aLineOut); + MOZ_ASSERT(aColumnOut); + + if (aValue.isObject()) { + JS::Rooted<JSObject*> obj(aCx, &aValue.toObject()); + + // Try to process as an Error object. Use the file/line/column values + // from the Error as they will be more specific to the root cause of + // the problem. + JSErrorReport* err = obj ? JS_ErrorFromException(aCx, obj) : nullptr; + if (err) { + // Use xpc to extract the error message only. We don't actually send + // this report anywhere. + RefPtr<xpc::ErrorReport> report = new xpc::ErrorReport(); + report->Init(err, + nullptr, // toString result + false, // chrome + 0); // window ID + + if (!report->mFileName.IsEmpty()) { + aSourceSpecOut = report->mFileName; + *aLineOut = report->mLineNumber; + *aColumnOut = report->mColumn; + } + aMessageOut.Assign(report->mErrorMsg); + } + + // Next, try to unwrap the rejection value as a DOMException. + else if (EXTRACT_EXN_VALUES(DOMException, aCx, obj, aSourceSpecOut, + aLineOut, aColumnOut, aMessageOut)) { + return; + } + + // Next, try to unwrap the rejection value as an XPC Exception. + else if (EXTRACT_EXN_VALUES(Exception, aCx, obj, aSourceSpecOut, aLineOut, + aColumnOut, aMessageOut)) { + return; + } + } + + // If we could not unwrap a specific error type, then perform default safe + // string conversions on primitives. Objects will result in "[Object]" + // unfortunately. + if (aMessageOut.IsEmpty()) { + nsAutoJSString jsString; + if (jsString.init(aCx, aValue)) { + aMessageOut = jsString; + } else { + JS_ClearPendingException(aCx); + } + } +} + +#undef EXTRACT_EXN_VALUES + +/* static */ +bool nsContentUtils::ContentIsLink(nsIContent* aContent) { + if (!aContent || !aContent->IsElement()) { + return false; + } + + if (aContent->IsHTMLElement(nsGkAtoms::a)) { + return true; + } + + return aContent->AsElement()->AttrValueIs(kNameSpaceID_XLink, nsGkAtoms::type, + nsGkAtoms::simple, eCaseMatters); +} + +/* static */ +already_AddRefed<ContentFrameMessageManager> +nsContentUtils::TryGetBrowserChildGlobal(nsISupports* aFrom) { + RefPtr<nsFrameLoaderOwner> frameLoaderOwner = do_QueryObject(aFrom); + if (!frameLoaderOwner) { + return nullptr; + } + + RefPtr<nsFrameLoader> frameLoader = frameLoaderOwner->GetFrameLoader(); + if (!frameLoader) { + return nullptr; + } + + RefPtr<ContentFrameMessageManager> manager = + frameLoader->GetBrowserChildMessageManager(); + return manager.forget(); +} + +/* static */ +uint32_t nsContentUtils::InnerOrOuterWindowCreated() { + MOZ_ASSERT(NS_IsMainThread()); + ++sInnerOrOuterWindowCount; + return ++sInnerOrOuterWindowSerialCounter; +} + +/* static */ +void nsContentUtils::InnerOrOuterWindowDestroyed() { + MOZ_ASSERT(NS_IsMainThread()); + MOZ_ASSERT(sInnerOrOuterWindowCount > 0); + --sInnerOrOuterWindowCount; +} + +/* static */ +nsresult nsContentUtils::AnonymizeURI(nsIURI* aURI, nsCString& aAnonymizedURI) { + MOZ_ASSERT(aURI); + + if (aURI->SchemeIs("data")) { + aAnonymizedURI.Assign("data:..."_ns); + return NS_OK; + } + // Anonymize the URL. + // Strip the URL of any possible username/password and make it ready to be + // presented in the UI. + nsCOMPtr<nsIURI> exposableURI = net::nsIOService::CreateExposableURI(aURI); + return exposableURI->GetSpec(aAnonymizedURI); +} + +static bool JSONCreator(const char16_t* aBuf, uint32_t aLen, void* aData) { + nsAString* result = static_cast<nsAString*>(aData); + result->Append(aBuf, aLen); + return true; +} + +/* static */ +bool nsContentUtils::StringifyJSON(JSContext* aCx, JS::Handle<JS::Value> aValue, + nsAString& aOutStr, JSONBehavior aBehavior) { + MOZ_ASSERT(aCx); + switch (aBehavior) { + case UndefinedIsNullStringLiteral: { + aOutStr.Truncate(); + JS::Rooted<JS::Value> value(aCx, aValue); + nsAutoString serializedValue; + NS_ENSURE_TRUE(JS_Stringify(aCx, &value, nullptr, JS::NullHandleValue, + JSONCreator, &serializedValue), + false); + aOutStr = serializedValue; + return true; + } + case UndefinedIsVoidString: { + aOutStr.SetIsVoid(true); + return JS::ToJSON(aCx, aValue, nullptr, JS::NullHandleValue, JSONCreator, + &aOutStr); + } + default: + MOZ_ASSERT_UNREACHABLE("Invalid value for aBehavior"); + return false; + } +} + +/* static */ +bool nsContentUtils:: + HighPriorityEventPendingForTopLevelDocumentBeforeContentfulPaint( + Document* aDocument) { + MOZ_ASSERT(XRE_IsContentProcess(), + "This function only makes sense in content processes"); + + if (aDocument && !aDocument->IsLoadedAsData()) { + if (nsPresContext* presContext = FindPresContextForDocument(aDocument)) { + MOZ_ASSERT(!presContext->IsChrome(), + "Should never have a chrome PresContext in a content process"); + + return !presContext->GetInProcessRootContentDocumentPresContext() + ->HadFirstContentfulPaint() && + nsThreadManager::MainThreadHasPendingHighPriorityEvents(); + } + } + return false; +} + +static nsGlobalWindowInner* GetInnerWindowForGlobal(nsIGlobalObject* aGlobal) { + NS_ENSURE_TRUE(aGlobal, nullptr); + + if (auto* window = aGlobal->AsInnerWindow()) { + return nsGlobalWindowInner::Cast(window); + } + + // When Extensions run content scripts inside a sandbox, it uses + // sandboxPrototype to make them appear as though they're running in the + // scope of the page. So when a content script invokes postMessage, it expects + // the |source| of the received message to be the window set as the + // sandboxPrototype. This used to work incidentally for unrelated reasons, but + // now we need to do some special handling to support it. + JS::Rooted<JSObject*> scope(RootingCx(), aGlobal->GetGlobalJSObject()); + NS_ENSURE_TRUE(scope, nullptr); + + if (xpc::IsSandbox(scope)) { + AutoJSAPI jsapi; + MOZ_ALWAYS_TRUE(jsapi.Init(scope)); + JSContext* cx = jsapi.cx(); + // Our current Realm on aCx is the sandbox. Using that for unwrapping + // makes sense: if the sandbox can unwrap the window, we can use it. + return xpc::SandboxWindowOrNull(scope, cx); + } + + // The calling window must be holding a reference, so we can return a weak + // pointer. + return nsGlobalWindowInner::Cast(aGlobal->AsInnerWindow()); +} + +/* static */ +nsGlobalWindowInner* nsContentUtils::IncumbentInnerWindow() { + return GetInnerWindowForGlobal(GetIncumbentGlobal()); +} + +/* static */ +nsGlobalWindowInner* nsContentUtils::EntryInnerWindow() { + return GetInnerWindowForGlobal(GetEntryGlobal()); +} + +/* static */ +bool nsContentUtils::IsURIInPrefList(nsIURI* aURI, const char* aPrefName) { + MOZ_ASSERT(aPrefName); + + nsAutoCString list; + Preferences::GetCString(aPrefName, list); + ToLowerCase(list); + return IsURIInList(aURI, list); +} + +/* static */ +bool nsContentUtils::IsURIInList(nsIURI* aURI, const nsCString& aList) { +#ifdef DEBUG + nsAutoCString listLowerCase(aList); + ToLowerCase(listLowerCase); + MOZ_ASSERT(listLowerCase.Equals(aList), + "The aList argument should be lower-case"); +#endif + + if (!aURI) { + return false; + } + + nsAutoCString scheme; + aURI->GetScheme(scheme); + if (!scheme.EqualsLiteral("http") && !scheme.EqualsLiteral("https")) { + return false; + } + + if (aList.IsEmpty()) { + return false; + } + + // The list is comma separated domain list. Each item may start with "*.". + // If starts with "*.", it matches any sub-domains. + + nsCCharSeparatedTokenizer tokenizer(aList, ','); + while (tokenizer.hasMoreTokens()) { + const nsCString token(tokenizer.nextToken()); + + nsAutoCString host; + aURI->GetHost(host); + if (host.IsEmpty()) { + return false; + } + ToLowerCase(host); + + for (;;) { + int32_t index = token.Find(host); + if (index >= 0 && + static_cast<uint32_t>(index) + host.Length() <= token.Length()) { + // If we found a full match, return true. + size_t indexAfterHost = index + host.Length(); + if (index == 0 && indexAfterHost == token.Length()) { + return true; + } + // If next character is '/', we need to check the path too. + // We assume the path in the list means "/foo" + "*". + if (token[indexAfterHost] == '/') { + nsDependentCSubstring pathInList( + token, indexAfterHost, + static_cast<nsDependentCSubstring::size_type>(-1)); + nsAutoCString filePath; + aURI->GetFilePath(filePath); + ToLowerCase(filePath); + if (StringBeginsWith(filePath, pathInList) && + (filePath.Length() == pathInList.Length() || + pathInList.EqualsLiteral("/") || + filePath[pathInList.Length() - 1] == '/' || + filePath[pathInList.Length() - 1] == '?' || + filePath[pathInList.Length() - 1] == '#')) { + return true; + } + } + } + int32_t startIndexOfCurrentLevel = host[0] == '*' ? 1 : 0; + int32_t startIndexOfNextLevel = + host.Find(".", startIndexOfCurrentLevel + 1); + if (startIndexOfNextLevel <= 0) { + break; + } + host = "*"_ns + nsDependentCSubstring(host, startIndexOfNextLevel); + } + } + + return false; +} + +/* static */ +ScreenIntMargin nsContentUtils::GetWindowSafeAreaInsets( + nsIScreen* aScreen, const ScreenIntMargin& aSafeAreaInsets, + const LayoutDeviceIntRect& aWindowRect) { + // This calculates safe area insets of window from screen rectangle, window + // rectangle and safe area insets of screen. + // + // +----------------------------------------+ <-- screen + // | +-------------------------------+ <------- window + // | | window's safe area inset top) | | + // +--+-------------------------------+--+ | + // | | | |<------ safe area rectangle of + // | | | | | screen + // +--+-------------------------------+--+ | + // | |window's safe area inset bottom| | + // | +-------------------------------+ | + // +----------------------------------------+ + // + ScreenIntMargin windowSafeAreaInsets; + + if (windowSafeAreaInsets == aSafeAreaInsets) { + // no safe area insets. + return windowSafeAreaInsets; + } + + int32_t screenLeft, screenTop, screenWidth, screenHeight; + nsresult rv = + aScreen->GetRect(&screenLeft, &screenTop, &screenWidth, &screenHeight); + if (NS_WARN_IF(NS_FAILED(rv))) { + return windowSafeAreaInsets; + } + + const ScreenIntRect screenRect(screenLeft, screenTop, screenWidth, + screenHeight); + + ScreenIntRect safeAreaRect = screenRect; + safeAreaRect.Deflate(aSafeAreaInsets); + + ScreenIntRect windowRect = ViewAs<ScreenPixel>( + aWindowRect, PixelCastJustification::LayoutDeviceIsScreenForTabDims); + + // FIXME(bug 1754323): This can trigger because the screen rect is not + // orientation-aware. + // MOZ_ASSERT(screenRect.Contains(windowRect), + // "Screen doesn't contain window rect? Something seems off"); + + // window's rect of safe area + safeAreaRect = safeAreaRect.Intersect(windowRect); + + windowSafeAreaInsets.top = safeAreaRect.y - aWindowRect.y; + windowSafeAreaInsets.left = safeAreaRect.x - aWindowRect.x; + windowSafeAreaInsets.right = + aWindowRect.x + aWindowRect.width - (safeAreaRect.x + safeAreaRect.width); + windowSafeAreaInsets.bottom = aWindowRect.y + aWindowRect.height - + (safeAreaRect.y + safeAreaRect.height); + + windowSafeAreaInsets.EnsureAtLeast(ScreenIntMargin()); + // This shouldn't be needed, but it wallpapers orientation issues, see bug + // 1754323. + windowSafeAreaInsets.EnsureAtMost(aSafeAreaInsets); + + return windowSafeAreaInsets; +} + +/* static */ +nsContentUtils::SubresourceCacheValidationInfo +nsContentUtils::GetSubresourceCacheValidationInfo(nsIRequest* aRequest, + nsIURI* aURI) { + SubresourceCacheValidationInfo info; + if (nsCOMPtr<nsICacheInfoChannel> cache = do_QueryInterface(aRequest)) { + uint32_t value = 0; + if (NS_SUCCEEDED(cache->GetCacheTokenExpirationTime(&value))) { + info.mExpirationTime.emplace(value); + } + } + + // Determine whether the cache entry must be revalidated when we try to use + // it. Currently, only HTTP specifies this information... + if (nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aRequest)) { + Unused << httpChannel->IsNoStoreResponse(&info.mMustRevalidate); + + if (!info.mMustRevalidate) { + Unused << httpChannel->IsNoCacheResponse(&info.mMustRevalidate); + } + } + + // data: URIs are safe to cache across documents under any circumstance, so we + // special-case them here even though the channel itself doesn't have any + // caching policy. Same for chrome:// uris. + // + // TODO(emilio): Figure out which other schemes that don't have caching + // policies are safe to cache. Blobs should be... + const bool knownCacheable = [&] { + if (!aURI) { + return false; + } + if (aURI->SchemeIs("data") || aURI->SchemeIs("moz-page-thumb") || + aURI->SchemeIs("moz-extension")) { + return true; + } + if (aURI->SchemeIs("chrome") || aURI->SchemeIs("resource")) { + return !StaticPrefs::nglayout_debug_disable_xul_cache(); + } + return false; + }(); + + if (knownCacheable) { + MOZ_ASSERT(!info.mExpirationTime); + MOZ_ASSERT(!info.mMustRevalidate); + info.mExpirationTime = Some(0); // 0 means "doesn't expire". + } + + return info; +} + +nsCString nsContentUtils::TruncatedURLForDisplay(nsIURI* aURL, size_t aMaxLen) { + nsCString spec; + if (aURL) { + aURL->GetSpec(spec); + spec.Truncate(std::min(aMaxLen, spec.Length())); + } + return spec; +} + +/* static */ +nsresult nsContentUtils::AnonymizeId(nsAString& aId, + const nsACString& aOriginKey, + OriginFormat aFormat) { + MOZ_ASSERT(NS_IsMainThread()); + + nsresult rv; + nsCString rawKey; + if (aFormat == OriginFormat::Base64) { + rv = Base64Decode(aOriginKey, rawKey); + NS_ENSURE_SUCCESS(rv, rv); + } else { + rawKey = aOriginKey; + } + + HMAC hmac; + rv = hmac.Begin( + SEC_OID_SHA256, + Span(reinterpret_cast<const uint8_t*>(rawKey.get()), rawKey.Length())); + NS_ENSURE_SUCCESS(rv, rv); + + NS_ConvertUTF16toUTF8 id(aId); + rv = hmac.Update(reinterpret_cast<const uint8_t*>(id.get()), id.Length()); + NS_ENSURE_SUCCESS(rv, rv); + + nsTArray<uint8_t> macBytes; + rv = hmac.End(macBytes); + NS_ENSURE_SUCCESS(rv, rv); + + nsCString macBase64; + rv = Base64Encode( + nsDependentCSubstring(reinterpret_cast<const char*>(macBytes.Elements()), + macBytes.Length()), + macBase64); + NS_ENSURE_SUCCESS(rv, rv); + + CopyUTF8toUTF16(macBase64, aId); + return NS_OK; +} + +/* static */ +bool nsContentUtils::ShouldHideObjectOrEmbedImageDocument() { + return StaticPrefs:: + browser_opaqueResponseBlocking_syntheticBrowsingContext_AtStartup() && + StaticPrefs:: + browser_opaqueResponseBlocking_syntheticBrowsingContext_filter_AtStartup_DoNotUseDirectly(); +} + +/* static */ +uint32_t nsContentUtils::ResolveObjectType(uint32_t aType) { + if (!StaticPrefs:: + browser_opaqueResponseBlocking_syntheticBrowsingContext_AtStartup()) { + return aType; + } + + if (aType != nsIObjectLoadingContent::TYPE_IMAGE) { + return aType; + } + + return nsIObjectLoadingContent::TYPE_DOCUMENT; +} + +void nsContentUtils::RequestGeckoTaskBurst() { + nsCOMPtr<nsIAppShell> appShell = do_GetService(NS_APPSHELL_CID); + if (appShell) { + appShell->GeckoTaskBurst(); + } +} + +nsIContent* nsContentUtils::GetClosestLinkInFlatTree(nsIContent* aContent) { + for (nsIContent* content = aContent; content; + content = content->GetFlattenedTreeParent()) { + if (nsContentUtils::IsDraggableLink(content)) { + return content; + } + } + return nullptr; +} + +namespace mozilla { +std::ostream& operator<<(std::ostream& aOut, + const PreventDefaultResult aPreventDefaultResult) { + switch (aPreventDefaultResult) { + case PreventDefaultResult::No: + aOut << "unhandled"; + break; + case PreventDefaultResult::ByContent: + aOut << "handled-by-content"; + break; + case PreventDefaultResult::ByChrome: + aOut << "handled-by-chrome"; + break; + } + return aOut; +} +} // namespace mozilla |