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Diffstat (limited to 'dom/base/nsContentUtils.h')
| -rw-r--r-- | dom/base/nsContentUtils.h | 3636 |
1 files changed, 3636 insertions, 0 deletions
diff --git a/dom/base/nsContentUtils.h b/dom/base/nsContentUtils.h new file mode 100644 index 0000000000..0dfb4d790f --- /dev/null +++ b/dom/base/nsContentUtils.h @@ -0,0 +1,3636 @@ +/* -*- 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 content utilities. */ + +#ifndef nsContentUtils_h___ +#define nsContentUtils_h___ + +#if defined(XP_WIN) +# include <float.h> +#endif + +#if defined(SOLARIS) +# include <ieeefp.h> +#endif + +#include <cstddef> +#include <cstdint> +#include <functional> +#include <tuple> +#include <utility> +#include "ErrorList.h" +#include "Units.h" +#include "js/Id.h" +#include "js/RootingAPI.h" +#include "mozilla/AlreadyAddRefed.h" +#include "mozilla/Assertions.h" +#include "mozilla/Attributes.h" +#include "mozilla/BasicEvents.h" +#include "mozilla/CORSMode.h" +#include "mozilla/CallState.h" +#include "mozilla/Maybe.h" +#include "mozilla/RefPtr.h" +#include "mozilla/TaskCategory.h" +#include "mozilla/TimeStamp.h" +#include "mozilla/UniquePtr.h" +#include "mozilla/dom/BindingDeclarations.h" +#include "mozilla/dom/FromParser.h" +#include "mozilla/fallible.h" +#include "mozilla/gfx/Point.h" +#include "nsCOMPtr.h" +#include "nsHashtablesFwd.h" +#include "nsIContentPolicy.h" +#include "nsINode.h" +#include "nsIScriptError.h" +#include "nsIThread.h" +#include "nsLiteralString.h" +#include "nsMargin.h" +#include "nsPIDOMWindow.h" +#include "nsStringFwd.h" +#include "nsTArray.h" +#include "nsTLiteralString.h" +#include "prtime.h" + +#if defined(XP_WIN) +// Undefine LoadImage to prevent naming conflict with Windows. +# undef LoadImage +#endif + +class JSObject; +class imgICache; +class imgIContainer; +class imgINotificationObserver; +class imgIRequest; +class imgLoader; +class imgRequestProxy; +class nsAtom; +class nsAttrValue; +class nsAutoScriptBlockerSuppressNodeRemoved; +class nsContentList; +class nsCycleCollectionTraversalCallback; +class nsDocShell; +class nsGlobalWindowInner; +class nsHtml5StringParser; +class nsIArray; +class nsIBidiKeyboard; +class nsIChannel; +class nsIConsoleService; +class nsIContent; +class nsIDocShell; +class nsIDocShellTreeItem; +class nsIDocumentLoaderFactory; +class nsIDragSession; +class nsIFile; +class nsIFragmentContentSink; +class nsIFrame; +class nsIHttpChannel; +class nsIIOService; +class nsIImageLoadingContent; +class nsIInterfaceRequestor; +class nsILoadGroup; +class nsILoadInfo; +class nsIObserver; +class nsIPluginTag; +class nsIPrincipal; +class nsIReferrerInfo; +class nsIRequest; +class nsIRunnable; +class nsIScreen; +class nsIScriptContext; +class nsIScriptSecurityManager; +class nsISerialEventTarget; +class nsIStringBundle; +class nsIStringBundleService; +class nsISupports; +class nsITransferable; +class nsIURI; +class nsIWidget; +class nsIWritableVariant; +class nsIXPConnect; +class nsNodeInfoManager; +class nsParser; +class nsPIWindowRoot; +class nsPresContext; +class nsStringBuffer; +class nsStringHashKey; +class nsTextFragment; +class nsView; +class nsWrapperCache; + +struct JSContext; +struct nsPoint; + +template <class T> +class nsRefPtrHashKey; + +namespace IPC { +class Message; +class MessageReader; +class MessageWriter; +} // namespace IPC + +namespace JS { +class Value; +class PropertyDescriptor; +} // namespace JS + +namespace mozilla { +class Dispatcher; +class EditorBase; +class ErrorResult; +class EventListenerManager; +class HTMLEditor; +class LazyLogModule; +class LogModule; +class PresShell; +class TextEditor; +class WidgetDragEvent; +class WidgetKeyboardEvent; + +struct InputEventOptions; + +template <typename ParentType, typename RefType> +class RangeBoundaryBase; + +template <typename T> +class NotNull; +template <class T> +class StaticRefPtr; + +namespace dom { +class IPCImage; +struct AutocompleteInfo; +class BrowserChild; +class BrowserParent; +class BrowsingContext; +class BrowsingContextGroup; +class ContentChild; +class ContentFrameMessageManager; +class ContentParent; +struct CustomElementDefinition; +class CustomElementRegistry; +class DataTransfer; +class Document; +class DocumentFragment; +class DOMArena; +class Element; +class Event; +class EventTarget; +class HTMLInputElement; +class IPCDataTransfer; +class IPCDataTransferImageContainer; +class IPCDataTransferItem; +struct LifecycleCallbackArgs; +class MessageBroadcaster; +class NodeInfo; +class Selection; +struct StructuredSerializeOptions; +class WorkerPrivate; +enum class ElementCallbackType; +enum class ReferrerPolicy : uint8_t; +} // namespace dom + +namespace ipc { +class BigBuffer; +class IProtocol; +} // namespace ipc + +namespace gfx { +class DataSourceSurface; +enum class SurfaceFormat : int8_t; +} // namespace gfx + +class WindowRenderer; + +} // namespace mozilla + +extern const char kLoadAsData[]; + +// Stolen from nsReadableUtils, but that's OK, since we can declare the same +// name multiple times. +const nsString& EmptyString(); +const nsCString& EmptyCString(); + +enum EventNameType { + EventNameType_None = 0x0000, + EventNameType_HTML = 0x0001, + EventNameType_XUL = 0x0002, + EventNameType_SVGGraphic = 0x0004, // svg graphic elements + EventNameType_SVGSVG = 0x0008, // the svg element + EventNameType_SMIL = 0x0010, // smil elements + EventNameType_HTMLBodyOrFramesetOnly = 0x0020, + EventNameType_HTMLMarqueeOnly = 0x0040, + + EventNameType_HTMLXUL = 0x0003, + EventNameType_All = 0xFFFF +}; + +struct EventNameMapping { + // This holds pointers to nsGkAtoms members, and is therefore safe as a + // non-owning reference. + nsAtom* MOZ_NON_OWNING_REF mAtom; + int32_t mType; + mozilla::EventMessage mMessage; + mozilla::EventClassID mEventClassID; + // True if mAtom is possibly used by special SVG/SMIL events, but + // mMessage is eUnidentifiedEvent. See EventNameList.h + bool mMaybeSpecialSVGorSMILEvent; +}; + +namespace mozilla { +enum class PreventDefaultResult : uint8_t { No, ByContent, ByChrome }; +} + +class nsContentUtils { + friend class nsAutoScriptBlockerSuppressNodeRemoved; + using Element = mozilla::dom::Element; + using Document = mozilla::dom::Document; + using Cancelable = mozilla::Cancelable; + using CanBubble = mozilla::CanBubble; + using Composed = mozilla::Composed; + using ChromeOnlyDispatch = mozilla::ChromeOnlyDispatch; + using EventMessage = mozilla::EventMessage; + using TimeDuration = mozilla::TimeDuration; + using Trusted = mozilla::Trusted; + + public: + static nsresult Init(); + + static bool IsCallerChrome(); + static bool ThreadsafeIsCallerChrome(); + static bool IsCallerUAWidget(); + static bool IsFuzzingEnabled() +#ifndef FUZZING + { + return false; + } +#else + ; +#endif + static bool IsErrorPage(nsIURI* aURI); + + static bool IsCallerChromeOrFuzzingEnabled(JSContext* aCx, JSObject*) { + return ThreadsafeIsSystemCaller(aCx) || IsFuzzingEnabled(); + } + + static bool IsCallerChromeOrElementTransformGettersEnabled(JSContext* aCx, + JSObject*); + + // The APIs for checking whether the caller is system (in the sense of system + // principal) should only be used when the JSContext is known to accurately + // represent the caller. In practice, that means you should only use them in + // two situations at the moment: + // + // 1) Functions used in WebIDL Func annotations. + // 2) Bindings code or other code called directly from the JS engine. + // + // Use pretty much anywhere else is almost certainly wrong and should be + // replaced with [NeedsCallerType] annotations in bindings. + + // Check whether the caller is system if you know you're on the main thread. + static bool IsSystemCaller(JSContext* aCx); + + // Check whether the caller is system if you might be on a worker or worklet + // thread. + static bool ThreadsafeIsSystemCaller(JSContext* aCx); + + // In the traditional Gecko architecture, both C++ code and untrusted JS code + // needed to rely on the same XPCOM method/getter/setter to get work done. + // This required lots of security checks in the various exposed methods, which + // in turn created difficulty in determining whether the caller was script + // (whose access needed to be checked) and internal C++ platform code (whose + // access did not need to be checked). To address this problem, Gecko had a + // convention whereby the absence of script on the stack was interpretted as + // "System Caller" and always granted unfettered access. + // + // Unfortunately, this created a bunch of footguns. For example, when the + // implementation of a DOM method wanted to perform a privileged + // sub-operation, it needed to "hide" the presence of script on the stack in + // order for that sub-operation to be allowed. Additionally, if script could + // trigger an API entry point to be invoked in some asynchronous way without + // script on the stack, it could potentially perform privilege escalation. + // + // In the modern world, untrusted script should interact with the platform + // exclusively over WebIDL APIs, and platform code has a lot more flexibility + // in deciding whether or not to use XPCOM. This gives us the flexibility to + // do something better. + // + // Going forward, APIs should be designed such that any security checks that + // ask the question "is my caller allowed to do this?" should live in WebIDL + // API entry points, with a separate method provided for internal callers + // that just want to get the job done. + // + // To enforce this and catch bugs, nsContentUtils::SubjectPrincipal will crash + // if it is invoked without script on the stack. To land that transition, it + // was necessary to go through and whitelist a bunch of callers that were + // depending on the old behavior. Those callers should be fixed up, and these + // methods should not be used by new code without review from bholley or bz. + static bool LegacyIsCallerNativeCode() { return !GetCurrentJSContext(); } + static bool LegacyIsCallerChromeOrNativeCode() { + return LegacyIsCallerNativeCode() || IsCallerChrome(); + } + static nsIPrincipal* SubjectPrincipalOrSystemIfNativeCaller() { + if (!GetCurrentJSContext()) { + return GetSystemPrincipal(); + } + return SubjectPrincipal(); + } + + static bool LookupBindingMember( + JSContext* aCx, nsIContent* aContent, JS::Handle<jsid> aId, + JS::MutableHandle<JS::PropertyDescriptor> aDesc); + + // Check whether we should avoid leaking distinguishing information to JS/CSS. + // This function can be called both in the main thread and worker threads. + static bool ShouldResistFingerprinting(); + static bool ShouldResistFingerprinting(nsIGlobalObject* aGlobalObject); + static bool ShouldResistFingerprinting(nsIDocShell* aDocShell); + // These functions are the new, nuanced functions + static bool ShouldResistFingerprinting(nsIChannel* aChannel); + static bool ShouldResistFingerprinting(nsILoadInfo* aPrincipal); + // These functions are labeled as dangerous because they will do the wrong + // thing in _most_ cases. They should only be used if you don't have a fully + // constructed LoadInfo or Document. + // A constant string used as justification is required when calling them, + // it should explain why a Document, Channel, LoadInfo, or CookieJarSettings + // does not exist in this context. + // (see below for more on justification strings.) + static bool ShouldResistFingerprinting_dangerous( + nsIURI* aURI, const mozilla::OriginAttributes& aOriginAttributes, + const char* aJustification); + static bool ShouldResistFingerprinting_dangerous(nsIPrincipal* aPrincipal, + const char* aJustification); + + /** + * Implement a RFP function that only checks the pref, and does not take + * into account any additional context such as PBM mode or Web Extensions. + * + * It requires an explanation for why the coarse check is being used instead + * of the nuanced check. While there is a gradual cut over of + * ShouldResistFingerprinting calls to a nuanced API, some features still + * require a legacy function. (Additionally, we sometimes use the coarse + * check first, to avoid running additional code to support a nuanced check.) + */ + static bool ShouldResistFingerprinting(const char* aJustification); + + // A helper function to calculate the rounded window size for fingerprinting + // resistance. The rounded size is based on the chrome UI size and available + // screen size. If the inputWidth/Height is greater than the available content + // size, this will report the available content size. Otherwise, it will + // round the size to the nearest upper 200x100. + static void 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); + + /** + * Returns the parent node of aChild crossing document boundaries, but skips + * any cross-process parent frames and continues with the nearest in-process + * frame in the hierarchy. + * + * Uses the parent node in the composed document. + */ + static nsINode* GetNearestInProcessCrossDocParentNode(nsINode* aChild); + + /** + * Similar to nsINode::IsInclusiveDescendantOf, except will treat an + * HTMLTemplateElement or ShadowRoot as an ancestor of things in the + * corresponding DocumentFragment. See the concept of "host-including + * inclusive ancestor" in the DOM specification. + */ + static bool ContentIsHostIncludingDescendantOf( + const nsINode* aPossibleDescendant, const nsINode* aPossibleAncestor); + + /** + * Similar to nsINode::IsInclusiveDescendantOf except it crosses document + * boundaries, this function uses ancestor/descendant relations in the + * composed document (see shadow DOM spec). + */ + static bool ContentIsCrossDocDescendantOf(nsINode* aPossibleDescendant, + nsINode* aPossibleAncestor); + + /** + * As with ContentIsCrossDocDescendantOf but crosses shadow boundaries but not + * cross document boundaries. + * + * @see nsINode::GetFlattenedTreeParentNode() + */ + static bool ContentIsFlattenedTreeDescendantOf( + const nsINode* aPossibleDescendant, const nsINode* aPossibleAncestor); + + /** + * Same as `ContentIsFlattenedTreeDescendantOf`, but from the flattened tree + * point of view of the style system + * + * @see nsINode::GetFlattenedTreeParentNodeForStyle() + */ + static bool ContentIsFlattenedTreeDescendantOfForStyle( + const nsINode* aPossibleDescendant, const nsINode* aPossibleAncestor); + + /** + * Retarget an object A against an object B + * @see https://dom.spec.whatwg.org/#retarget + */ + static nsINode* Retarget(nsINode* aTargetA, nsINode* aTargetB); + + /** + * @see https://wicg.github.io/element-timing/#get-an-element + */ + static nsINode* GetAnElementForTiming(Element* aTarget, + const Document* aDocument, + nsIGlobalObject* aGlobal); + + /* + * https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor. + * + * This method fills the |aArray| with all ancestor nodes of |aNode| + * including |aNode| at the zero index. + * + */ + static nsresult GetInclusiveAncestors(nsINode* aNode, + nsTArray<nsINode*>& aArray); + + /* + * https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor. + * + * This method fills |aAncestorNodes| with all ancestor nodes of |aNode| + * including |aNode| (QI'd to nsIContent) at the zero index. + * For each ancestor, there is a corresponding element in |aAncestorOffsets| + * which is the ComputeIndexOf the child in relation to its parent. + * + * This method just sucks. + */ + static nsresult GetInclusiveAncestorsAndOffsets( + nsINode* aNode, uint32_t aOffset, nsTArray<nsIContent*>* aAncestorNodes, + nsTArray<mozilla::Maybe<uint32_t>>* aAncestorOffsets); + + /** + * Returns the closest common inclusive ancestor + * (https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor) , if any, + * for two nodes. + * + * Returns null if the nodes are disconnected. + */ + static nsINode* GetClosestCommonInclusiveAncestor(nsINode* aNode1, + nsINode* aNode2) { + if (aNode1 == aNode2) { + return aNode1; + } + + return GetCommonAncestorHelper(aNode1, aNode2); + } + + /** + * Returns the common flattened tree ancestor, if any, for two given content + * nodes. + */ + static nsIContent* GetCommonFlattenedTreeAncestor(nsIContent* aContent1, + nsIContent* aContent2) { + if (aContent1 == aContent2) { + return aContent1; + } + + return GetCommonFlattenedTreeAncestorHelper(aContent1, aContent2); + } + + /** + * Returns the common flattened tree ancestor from the point of view of the + * style system, if any, for two given content nodes. + */ + static Element* GetCommonFlattenedTreeAncestorForStyle(Element* aElement1, + Element* aElement2); + + /** + * Returns the common ancestor under interactive content, if any. + * If neither one has interactive content as ancestor, common ancestor will be + * returned. If only one has interactive content as ancestor, null will be + * returned. If the nodes are the same, that node is returned. + */ + static nsINode* GetCommonAncestorUnderInteractiveContent(nsINode* aNode1, + nsINode* aNode2); + + /** + * Returns the common BrowserParent ancestor, if any, for two given + * BrowserParent. + */ + static mozilla::dom::BrowserParent* GetCommonBrowserParentAncestor( + mozilla::dom::BrowserParent* aBrowserParent1, + mozilla::dom::BrowserParent* aBrowserParent2); + + /** + * Returns true if aNode1 is before aNode2 in the same connected + * tree. + * aNode1Index and aNode2Index are in/out arguments. If non-null, and value is + * Some, that value is used instead of calling slow ComputeIndexOf on the + * parent node. If value is Nothing, the value will be set to the return value + * of ComputeIndexOf. + */ + static bool PositionIsBefore(nsINode* aNode1, nsINode* aNode2, + mozilla::Maybe<uint32_t>* aNode1Index = nullptr, + mozilla::Maybe<uint32_t>* aNode2Index = nullptr); + + struct ComparePointsCache { + mozilla::Maybe<uint32_t> ComputeIndexOf(const nsINode* aParent, + const nsINode* aChild) { + if (aParent == mParent && aChild == mChild) { + return mIndex; + } + + mIndex = aParent->ComputeIndexOf(aChild); + mParent = aParent; + mChild = aChild; + return mIndex; + } + + private: + const nsINode* mParent = nullptr; + const nsINode* mChild = nullptr; + mozilla::Maybe<uint32_t> mIndex; + }; + + /** + * Utility routine to compare two "points", where a point is a node/offset + * pair. + * Pass a cache object as aParent1Cache if you expect to repeatedly + * call this function with the same value as aParent1. + * + * @return -1 if point1 < point2, + * 1 if point1 > point2, + * 0 if point1 == point2. + * `Nothing` if the two nodes aren't in the same connected subtree. + */ + static mozilla::Maybe<int32_t> ComparePoints( + const nsINode* aParent1, uint32_t aOffset1, const nsINode* aParent2, + uint32_t aOffset2, ComparePointsCache* aParent1Cache = nullptr); + template <typename FPT, typename FRT, typename SPT, typename SRT> + static mozilla::Maybe<int32_t> ComparePoints( + const mozilla::RangeBoundaryBase<FPT, FRT>& aFirstBoundary, + const mozilla::RangeBoundaryBase<SPT, SRT>& aSecondBoundary); + + /** + * Utility routine to compare two "points", where a point is a + * node/offset pair + * Returns -1 if point1 < point2, 1, if point1 > point2, + * 0 if error or if point1 == point2. + * NOTE! If the two nodes aren't in the same connected subtree, + * the result is 1, and the optional aDisconnected parameter + * is set to true. + * + * Pass a cache object as aParent1Cache if you expect to repeatedly + * call this function with the same value as aParent1. + */ + static int32_t ComparePoints_Deprecated( + const nsINode* aParent1, uint32_t aOffset1, const nsINode* aParent2, + uint32_t aOffset2, bool* aDisconnected = nullptr, + ComparePointsCache* aParent1Cache = nullptr); + template <typename FPT, typename FRT, typename SPT, typename SRT> + static int32_t ComparePoints_Deprecated( + const mozilla::RangeBoundaryBase<FPT, FRT>& aFirstBoundary, + const mozilla::RangeBoundaryBase<SPT, SRT>& aSecondBoundary, + bool* aDisconnected = nullptr); + + /** + * DO NOT USE this method for comparing the points in new code. this method + * emulates same result as `ComparePoints` before bug 1741148. + * When the old `ComparePoints` was called with offset value over `INT32_MAX` + * or `-1` which is used as "not found" by some API, they were treated as-is + * without checking whether the negative value or valid value. Thus, this + * handles the negative offset cases in the special paths to keep the + * traditional behavior. If you want to use this in new code, it means that + * you **should** check the offset values and call `ComparePoints` instead. + */ + static mozilla::Maybe<int32_t> ComparePoints_AllowNegativeOffsets( + const nsINode* aParent1, int64_t aOffset1, const nsINode* aParent2, + int64_t aOffset2) { + if (MOZ_UNLIKELY(aOffset1 < 0 || aOffset2 < 0)) { + // If in same container, just the offset is compared. + if (aParent1 == aParent2) { + const int32_t compOffsets = + aOffset1 == aOffset2 ? 0 : (aOffset1 < aOffset2 ? -1 : 1); + return mozilla::Some(compOffsets); + } + // Otherwise, aOffset1 is referred only when aParent2 is a descendant of + // aParent1. + if (aOffset1 < 0 && aParent2->IsInclusiveDescendantOf(aParent1)) { + return mozilla::Some(-1); + } + // And also aOffset2 is referred only when aParent1 is a descendant of + // aParent2. + if (aOffset2 < 0 && aParent1->IsInclusiveDescendantOf(aParent2)) { + return mozilla::Some(1); + } + // Otherwise, aOffset1 nor aOffset2 is referred so that any value is fine + // if negative. + return ComparePoints( + aParent1, aOffset1 < 0 ? UINT32_MAX : static_cast<uint32_t>(aOffset1), + aParent2, + aOffset2 < 0 ? UINT32_MAX : static_cast<uint32_t>(aOffset2)); + } + return ComparePoints(aParent1, aOffset1, aParent2, aOffset2); + } + + /** + * Brute-force search of the element subtree rooted at aContent for + * an element with the given id. aId must be nonempty, otherwise + * this method may return nodes even if they have no id! + */ + static Element* MatchElementId(nsIContent* aContent, const nsAString& aId); + + /** + * Similar to above, but to be used if one already has an atom for the ID + */ + static Element* MatchElementId(nsIContent* aContent, const nsAtom* aId); + + /** + * Reverses the document position flags passed in. + * + * @param aDocumentPosition The document position flags to be reversed. + * + * @return The reversed document position flags. + * + * @see Node + */ + static uint16_t ReverseDocumentPosition(uint16_t aDocumentPosition); + + static const nsDependentSubstring TrimCharsInSet(const char* aSet, + const nsAString& aValue); + + template <bool IsWhitespace(char16_t)> + static const nsDependentSubstring TrimWhitespace(const nsAString& aStr, + bool aTrimTrailing = true); + + /** + * Returns true if aChar is of class Ps, Pi, Po, Pf, or Pe. + */ + static bool IsFirstLetterPunctuation(uint32_t aChar); + + /** + * Returns true if aChar is of class Lu, Ll, Lt, Lm, Lo, Nd, Nl or No + */ + static bool IsAlphanumeric(uint32_t aChar); + /** + * Returns true if aChar is of class L*, N* or S* (for first-letter). + */ + static bool IsAlphanumericOrSymbol(uint32_t aChar); + + /* + * Is the character an HTML whitespace character? + * + * We define whitespace using the list in HTML5 and css3-selectors: + * U+0009, U+000A, U+000C, U+000D, U+0020 + * + * HTML 4.01 also lists U+200B (zero-width space). + */ + static bool IsHTMLWhitespace(char16_t aChar); + + /* + * Returns whether the character is an HTML whitespace (see IsHTMLWhitespace) + * or a nbsp character (U+00A0). + */ + static bool IsHTMLWhitespaceOrNBSP(char16_t aChar); + + /** + * https://developer.mozilla.org/en-US/docs/Web/HTML/Block-level_elements + */ + static bool IsHTMLBlockLevelElement(nsIContent* aContent); + + enum ParseHTMLIntegerResultFlags { + eParseHTMLInteger_NoFlags = 0, + // eParseHTMLInteger_NonStandard is set if the string representation of the + // integer was not the canonical one, but matches at least one of the + // following: + // * had leading whitespaces + // * had '+' sign + // * had leading '0' + // * was '-0' + eParseHTMLInteger_NonStandard = 1 << 0, + eParseHTMLInteger_DidNotConsumeAllInput = 1 << 1, + // Set if one or more error flags were set. + eParseHTMLInteger_Error = 1 << 2, + eParseHTMLInteger_ErrorNoValue = 1 << 3, + eParseHTMLInteger_ErrorOverflow = 1 << 4, + // Use this flag to detect the difference between overflow and underflow + eParseHTMLInteger_Negative = 1 << 5, + }; + static int32_t ParseHTMLInteger(const nsAString& aValue, + ParseHTMLIntegerResultFlags* aResult) { + return ParseHTMLInteger(aValue.BeginReading(), aValue.EndReading(), + aResult); + } + static int32_t ParseHTMLInteger(const char16_t* aStart, const char16_t* aEnd, + ParseHTMLIntegerResultFlags* aResult); + static int32_t ParseHTMLInteger(const nsACString& aValue, + ParseHTMLIntegerResultFlags* aResult) { + return ParseHTMLInteger(aValue.BeginReading(), aValue.EndReading(), + aResult); + } + static int32_t ParseHTMLInteger(const char* aStart, const char* aEnd, + ParseHTMLIntegerResultFlags* aResult); + + private: + template <class CharT> + static int32_t ParseHTMLIntegerImpl(const CharT* aStart, const CharT* aEnd, + ParseHTMLIntegerResultFlags* aResult); + + public: + /** + * Parse a margin string of format 'top, right, bottom, left' into + * an nsIntMargin. + * + * @param aString the string to parse + * @param aResult the resulting integer + * @return whether the value could be parsed + */ + static bool ParseIntMarginValue(const nsAString& aString, + nsIntMargin& aResult); + + /** + * Parse the value of the <font size=""> attribute according to the HTML5 + * spec as of April 16, 2012. + * + * @param aValue the value to parse + * @return 1 to 7, or 0 if the value couldn't be parsed + */ + static int32_t ParseLegacyFontSize(const nsAString& aValue); + + static void Shutdown(); + + /** + * Checks whether two nodes come from the same origin. + */ + static nsresult CheckSameOrigin(const nsINode* aTrustedNode, + const nsINode* unTrustedNode); + + // Check if the (JS) caller can access aNode. + static bool CanCallerAccess(const nsINode* aNode); + + // Check if the (JS) caller can access aWindow. + // aWindow can be either outer or inner window. + static bool CanCallerAccess(nsPIDOMWindowInner* aWindow); + + // Check if the principal is chrome or an addon with the permission. + static bool PrincipalHasPermission(nsIPrincipal& aPrincipal, + const nsAtom* aPerm); + + // Check if the JS caller is chrome or an addon with the permission. + static bool CallerHasPermission(JSContext* aCx, const nsAtom* aPerm); + + /** + * Returns the triggering principal which should be used for the given URL + * attribute value with the given subject principal. + * + * If the attribute value is not an absolute URL, the subject principal will + * be ignored, and the node principal of aContent will be used instead. + * If aContent is non-null, this function will always return a principal. + * Otherewise, it may return null if aSubjectPrincipal is null or is rejected + * based on the attribute value. + * + * @param aContent The content on which the attribute is being set. + * @param aAttrValue The URL value of the attribute. For parsed attribute + * values, such as `srcset`, this function should be called separately + * for each URL value it contains. + * @param aSubjectPrincipal The subject principal of the scripted caller + * responsible for setting the attribute, or null if no scripted caller + * can be determined. + */ + static nsIPrincipal* GetAttrTriggeringPrincipal( + nsIContent* aContent, const nsAString& aAttrValue, + nsIPrincipal* aSubjectPrincipal); + + /** + * Returns true if the given string is guaranteed to be treated as an absolute + * URL, rather than a relative URL. In practice, this means any complete URL + * as supported by nsStandardURL, or any string beginning with a valid scheme + * which is known to the IO service, and has the URI_NORELATIVE flag. + * + * If the URL may be treated as absolute in some cases, but relative in others + * (for instance, "http:foo", which can be either an absolute or relative URL, + * depending on the context), this function returns false. + */ + static bool IsAbsoluteURL(const nsACString& aURL); + + // Check if a node is in the document prolog, i.e. before the document + // element. + static bool InProlog(nsINode* aNode); + + static nsIIOService* GetIOService() { return sIOService; } + + static nsIBidiKeyboard* GetBidiKeyboard(); + + /** + * Get the cache security manager service. Can return null if the layout + * module has been shut down. + */ + static nsIScriptSecurityManager* GetSecurityManager() { + return sSecurityManager; + } + + // Returns the subject principal from the JSContext. May only be called + // from the main thread and assumes an existing compartment. + static nsIPrincipal* SubjectPrincipal(JSContext* aCx); + + // Returns the subject principal. Guaranteed to return non-null. May only + // be called when nsContentUtils is initialized. + static nsIPrincipal* SubjectPrincipal(); + + // Returns the prinipal of the given JS object. This may only be called on + // the main thread for objects from the main thread's JSRuntime. The object + // must not be a cross-compartment wrapper, because CCWs are not associated + // with a single realm. + static nsIPrincipal* ObjectPrincipal(JSObject* aObj); + + static void GenerateStateKey(nsIContent* aContent, Document* aDocument, + nsACString& aKey); + + /** + * Create a new nsIURI from aSpec, using aBaseURI as the base. The + * origin charset of the new nsIURI will be the document charset of + * aDocument. + */ + static nsresult NewURIWithDocumentCharset(nsIURI** aResult, + const nsAString& aSpec, + Document* aDocument, + nsIURI* aBaseURI); + + /** + * Returns true if |aName| is a name with dashes. + */ + static bool IsNameWithDash(nsAtom* aName); + + /** + * Returns true if |aName| is a valid name to be registered via + * customElements.define. + */ + static bool IsCustomElementName(nsAtom* aName, uint32_t aNameSpaceID); + + static nsresult CheckQName(const nsAString& aQualifiedName, + bool aNamespaceAware = true, + const char16_t** aColon = nullptr); + + static nsresult SplitQName(const nsIContent* aNamespaceResolver, + const nsString& aQName, int32_t* aNamespace, + nsAtom** aLocalName); + + static nsresult GetNodeInfoFromQName(const nsAString& aNamespaceURI, + const nsAString& aQualifiedName, + nsNodeInfoManager* aNodeInfoManager, + uint16_t aNodeType, + mozilla::dom::NodeInfo** aNodeInfo); + + static void SplitExpatName(const char16_t* aExpatName, nsAtom** aPrefix, + nsAtom** aTagName, int32_t* aNameSpaceID); + + // Get a permission-manager setting for the given principal and type. + // If the pref doesn't exist or if it isn't ALLOW_ACTION, false is + // returned, otherwise true is returned. Always returns true for the + // system principal, and false for a null principal. + static bool IsSitePermAllow(nsIPrincipal* aPrincipal, + const nsACString& aType); + + // Get a permission-manager setting for the given principal and type. + // If the pref doesn't exist or if it isn't DENY_ACTION, false is + // returned, otherwise true is returned. Always returns false for the + // system principal, and true for a null principal. + static bool IsSitePermDeny(nsIPrincipal* aPrincipal, const nsACString& aType); + + // Get a permission-manager setting for the given principal and type. + // If the pref doesn't exist or if it isn't ALLOW_ACTION, false is + // returned, otherwise true is returned. Always returns true for the + // system principal, and false for a null principal. + // This version checks the permission for an exact host match on + // the principal + static bool IsExactSitePermAllow(nsIPrincipal* aPrincipal, + const nsACString& aType); + + // Get a permission-manager setting for the given principal and type. + // If the pref doesn't exist or if it isn't DENY_ACTION, false is + // returned, otherwise true is returned. Always returns false for the + // system principal, and true for a null principal. + // This version checks the permission for an exact host match on + // the principal + static bool IsExactSitePermDeny(nsIPrincipal* aPrincipal, + const nsACString& aType); + + // Returns true if the pref exists and is not UNKNOWN_ACTION. + static bool HasSitePerm(nsIPrincipal* aPrincipal, const nsACString& aType); + + // Returns true if aDoc1 and aDoc2 have equal NodePrincipal()s. + static bool HaveEqualPrincipals(Document* aDoc1, Document* aDoc2); + + /** + * Regster aObserver as a shutdown observer. A strong reference is held + * to aObserver until UnregisterShutdownObserver is called. + */ + static void RegisterShutdownObserver(nsIObserver* aObserver); + static void UnregisterShutdownObserver(nsIObserver* aObserver); + + /** + * @return true if aContent has an attribute aName in namespace aNameSpaceID, + * and the attribute value is non-empty. + */ + static bool HasNonEmptyAttr(const nsIContent* aContent, int32_t aNameSpaceID, + nsAtom* aName); + + /** + * Method that gets the primary presContext for the node. + * + * @param aContent The content node. + * @return the presContext, or nullptr if the content is not in a document + * (if GetComposedDoc returns nullptr) + */ + static nsPresContext* GetContextForContent(const nsIContent* aContent); + + /** + * Method that gets the pres shell for the node. + * + * @param aContent The content node. + * @return the pres shell, or nullptr if the content is not in a document + * (if GetComposedDoc returns nullptr) + */ + static mozilla::PresShell* GetPresShellForContent(const nsIContent* aContent); + + /** + * Method to do security and content policy checks on the image URI + * + * @param aURI uri of the image to be loaded + * @param aNode, the context the image is loaded in (eg an element) + * @param aLoadingDocument the document we belong to + * @param aLoadingPrincipal the principal doing the load + * @param [aContentPolicyType=nsIContentPolicy::TYPE_INTERNAL_IMAGE] + * (Optional) The CP content type to use + * @param aImageBlockingStatus the nsIContentPolicy blocking status for this + * image. This will be set even if a security check fails for the + * image, to some reasonable REJECT_* value. This out param will only + * be set if it's non-null. + * @return true if the load can proceed, or false if it is blocked. + * Note that aImageBlockingStatus, if set will always be an ACCEPT + * status if true is returned and always be a REJECT_* status if + * false is returned. + */ + static bool CanLoadImage(nsIURI* aURI, nsINode* aNode, + Document* aLoadingDocument, + nsIPrincipal* aLoadingPrincipal); + + /** + * Returns true if objects in aDocument shouldn't initiate image loads. + */ + static bool DocumentInactiveForImageLoads(Document* aDocument); + + /** + * Convert a CORSMode into the corresponding imgILoader flags for + * passing to LoadImage. + * @param aMode CORS mode to convert + * @return a bitfield suitable to bitwise OR with other nsIRequest flags + */ + static int32_t CORSModeToLoadImageFlags(mozilla::CORSMode aMode); + + /** + * Method to start an image load. This does not do any security checks. + * This method will attempt to make aURI immutable; a caller that wants to + * keep a mutable version around should pass in a clone. + * + * @param aURI uri of the image to be loaded + * @param aContext element of document where the result of this request + * will be used. + * @param aLoadingDocument the document we belong to + * @param aLoadingPrincipal the principal doing the load + * @param aReferrerInfo the referrerInfo use on channel creation + * @param aObserver the observer for the image load + * @param aLoadFlags the load flags to use. See nsIRequest + * @param [aContentPolicyType=nsIContentPolicy::TYPE_INTERNAL_IMAGE] + * (Optional) The CP content type to use + * @param aUseUrgentStartForChannel,(Optional) a flag to mark on channel if it + * is triggered by user input events. + * @return the imgIRequest for the image load + */ + static nsresult 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 = + nsIContentPolicy::TYPE_INTERNAL_IMAGE, + bool aUseUrgentStartForChannel = false, bool aLinkPreload = false, + uint64_t aEarlyHintPreloaderId = 0); + + /** + * Obtain an image loader that respects the given document/channel's privacy + * status. Null document/channel arguments return the public image loader. + */ + static imgLoader* GetImgLoaderForDocument(Document* aDoc); + static imgLoader* GetImgLoaderForChannel(nsIChannel* aChannel, + Document* aContext); + + /** + * Returns whether the given URI is in the image cache. + */ + static bool IsImageInCache(nsIURI* aURI, Document* aDocument); + + /** + * Method to get an imgIContainer from an image loading content + * + * @param aContent The image loading content. Must not be null. + * @param aRequest The image request [out] + * @return the imgIContainer corresponding to the first frame of the image + */ + static already_AddRefed<imgIContainer> GetImageFromContent( + nsIImageLoadingContent* aContent, imgIRequest** aRequest = nullptr); + + /** + * Method that decides whether a content node is draggable + * + * @param aContent The content node to test. + * @return whether it's draggable + */ + static bool ContentIsDraggable(nsIContent* aContent); + + /** + * Method that decides whether a content node is a draggable image + * + * @param aContent The content node to test. + * @return whether it's a draggable image + */ + static bool IsDraggableImage(nsIContent* aContent); + + /** + * Method that decides whether a content node is a draggable link + * + * @param aContent The content node to test. + * @return whether it's a draggable link + */ + static bool IsDraggableLink(const nsIContent* aContent); + + /** + * Convenience method to create a new nodeinfo that differs only by prefix and + * name from aNodeInfo. The new nodeinfo's name is set to aName, and prefix is + * set to null. + */ + static nsresult QNameChanged(mozilla::dom::NodeInfo* aNodeInfo, nsAtom* aName, + mozilla::dom::NodeInfo** aResult); + + /** + * Returns the appropriate event argument names for the specified + * namespace and event name. Added because we need to switch between + * SVG's "evt" and the rest of the world's "event", and because onerror + * on window takes 5 args. + */ + static void GetEventArgNames(int32_t aNameSpaceID, nsAtom* aEventName, + bool aIsForWindow, uint32_t* aArgCount, + const char*** aArgNames); + + /** + * Returns true if this document is in a Private Browsing window. + */ + static bool IsInPrivateBrowsing(Document* aDoc); + + /** + * Returns true if this loadGroup uses Private Browsing. + */ + static bool IsInPrivateBrowsing(nsILoadGroup* aLoadGroup); + + /** + * If aNode is not an element, return true exactly when aContent's binding + * parent is null. + * + * If aNode is an element, return true exactly when aContent's binding parent + * is the same as aNode's. + * + * This method is particularly useful for callers who are trying to ensure + * that they are working with a non-anonymous descendant of a given node. If + * aContent is a descendant of aNode, a return value of false from this + * method means that it's an anonymous descendant from aNode's point of view. + * + * Both arguments to this method must be non-null. + */ + static bool IsInSameAnonymousTree(const nsINode* aNode, + const nsIContent* aContent); + + /* + * Traverse the parent chain from aElement up to aStop, and return true if + * there's an interactive html content; false otherwise. + * + * Note: This crosses shadow boundaries but not document boundaries. + */ + static bool IsInInteractiveHTMLContent(const Element* aElement, + const Element* aStop); + + /** + * Return the nsIXPConnect service. + */ + static nsIXPConnect* XPConnect() { return sXPConnect; } + + /** + * Report simple error message to the browser console + * @param aErrorText the error message + * @param aCategory Name of the module reporting error + * @param aFromPrivateWindow Whether from private window or not + * @param aFromChromeContext Whether from chrome context or not + * @param [aErrorFlags] See nsIScriptError. + */ + static void LogSimpleConsoleError( + const nsAString& aErrorText, const nsACString& aCategory, + bool aFromPrivateWindow, bool aFromChromeContext, + uint32_t aErrorFlags = nsIScriptError::errorFlag); + + /** + * Report a non-localized error message to the error console. + * @param aErrorText the error message + * @param aErrorFlags See nsIScriptError. + * @param aCategory Name of module reporting error. + * @param aDocument Reference to the document which triggered the message. + * @param [aURI=nullptr] (Optional) URI of resource containing error. + * @param [aSourceLine=u""_ns] (Optional) The text of the line that + contains the error (may be empty). + * @param [aLineNumber=0] (Optional) Line number within resource + containing error. + * @param [aColumnNumber=0] (Optional) Column number within resource + containing error. + If aURI is null, then aDocument->GetDocumentURI() is used. + * @param [aLocationMode] (Optional) Specifies the behavior if + error location information is omitted. + */ + enum MissingErrorLocationMode { + // Don't show location information in the error console. + eOMIT_LOCATION, + // Get location information from the currently executing script. + eUSE_CALLING_LOCATION + }; + static nsresult ReportToConsoleNonLocalized( + const nsAString& aErrorText, uint32_t aErrorFlags, + const nsACString& aCategory, const Document* aDocument, + nsIURI* aURI = nullptr, const nsString& aSourceLine = u""_ns, + uint32_t aLineNumber = 0, uint32_t aColumnNumber = 0, + MissingErrorLocationMode aLocationMode = eUSE_CALLING_LOCATION); + + /** + * Report a non-localized error message to the error console base on the + * innerWindowID. + * @param aErrorText the error message + * @param aErrorFlags See nsIScriptError. + * @param aCategory Name of module reporting error. + * @param [aInnerWindowID] Inner window ID for document which triggered the + * message. + * @param [aURI=nullptr] (Optional) URI of resource containing error. + * @param [aSourceLine=u""_ns] (Optional) The text of the line that + contains the error (may be empty). + * @param [aLineNumber=0] (Optional) Line number within resource + containing error. + * @param [aColumnNumber=0] (Optional) Column number within resource + containing error. + If aURI is null, then aDocument->GetDocumentURI() is used. + * @param [aLocationMode] (Optional) Specifies the behavior if + error location information is omitted. + */ + static nsresult ReportToConsoleByWindowID( + const nsAString& aErrorText, uint32_t aErrorFlags, + const nsACString& aCategory, uint64_t aInnerWindowID, + nsIURI* aURI = nullptr, const nsString& aSourceLine = u""_ns, + uint32_t aLineNumber = 0, uint32_t aColumnNumber = 0, + MissingErrorLocationMode aLocationMode = eUSE_CALLING_LOCATION); + + /** + * Report a localized error message to the error console. + * @param aErrorFlags See nsIScriptError. + * @param aCategory Name of module reporting error. + * @param aDocument Reference to the document which triggered the message. + * @param aFile Properties file containing localized message. + * @param aMessageName Name of localized message. + * @param [aParams=empty-array] (Optional) Parameters to be substituted into + localized message. + * @param [aURI=nullptr] (Optional) URI of resource containing error. + * @param [aSourceLine=u""_ns] (Optional) The text of the line that + contains the error (may be empty). + * @param [aLineNumber=0] (Optional) Line number within resource + containing error. + * @param [aColumnNumber=0] (Optional) Column number within resource + containing error. + If aURI is null, then aDocument->GetDocumentURI() is used. + */ + enum PropertiesFile { + eCSS_PROPERTIES, + eXUL_PROPERTIES, + eLAYOUT_PROPERTIES, + eFORMS_PROPERTIES, + ePRINTING_PROPERTIES, + eDOM_PROPERTIES, + eHTMLPARSER_PROPERTIES, + eSVG_PROPERTIES, + eBRAND_PROPERTIES, + eCOMMON_DIALOG_PROPERTIES, + eMATHML_PROPERTIES, + eSECURITY_PROPERTIES, + eNECKO_PROPERTIES, + eFORMS_PROPERTIES_en_US, + eDOM_PROPERTIES_en_US, + PropertiesFile_COUNT + }; + static nsresult ReportToConsole( + uint32_t aErrorFlags, const nsACString& aCategory, + const Document* aDocument, PropertiesFile aFile, const char* aMessageName, + const nsTArray<nsString>& aParams = nsTArray<nsString>(), + nsIURI* aURI = nullptr, const nsString& aSourceLine = u""_ns, + uint32_t aLineNumber = 0, uint32_t aColumnNumber = 0); + + static void ReportEmptyGetElementByIdArg(const Document* aDoc); + + static void LogMessageToConsole(const char* aMsg); + + static bool SpoofLocaleEnglish(); + + /** + * Get the localized string named |aKey| in properties file |aFile|. + */ + static nsresult GetLocalizedString(PropertiesFile aFile, const char* aKey, + nsAString& aResult); + + /** + * Same as GetLocalizedString, except that it might use en-US locale depending + * on SpoofLocaleEnglish() and whether the document is a built-in browser + * page. + */ + static nsresult GetMaybeLocalizedString(PropertiesFile aFile, + const char* aKey, Document* aDocument, + nsAString& aResult); + + /** + * 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) + */ + static uint32_t ParseSandboxAttributeToFlags(const nsAttrValue* aSandboxAttr); + + /** + * 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. + */ + static bool IsValidSandboxFlag(const nsAString& aFlag); + + /** + * 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) + */ + static void SandboxFlagsToString(uint32_t aFlags, nsAString& aString); + + static bool PrefetchPreloadEnabled(nsIDocShell* aDocShell); + + static void ExtractErrorValues(JSContext* aCx, JS::Handle<JS::Value> aValue, + nsAString& aSourceSpecOut, uint32_t* aLineOut, + uint32_t* aColumnOut, nsString& aMessageOut); + + // Variant on `ExtractErrorValues` with a `nsACString`. This + // method is provided for backwards compatibility. Prefer the + // faster method above for your code. + static void ExtractErrorValues(JSContext* aCx, JS::Handle<JS::Value> aValue, + nsACString& aSourceSpecOut, uint32_t* aLineOut, + uint32_t* aColumnOut, nsString& aMessageOut); + + static nsresult CalculateBufferSizeForImage( + const uint32_t& aStride, const mozilla::gfx::IntSize& aImageSize, + const mozilla::gfx::SurfaceFormat& aFormat, size_t* aMaxBufferSize, + size_t* aUsedBufferSize); + + // Returns true if the URI's host is contained in a list which is a comma + // separated domain list. Each item may start with "*.". If starts with + // "*.", it matches any sub-domains. + // The aList argument must be a lower-case string. + static bool IsURIInList(nsIURI* aURI, const nsCString& aList); + + // Returns true if the URI's host is contained in a pref list which is a comma + // separated domain list. Each item may start with "*.". If starts with + // "*.", it matches any sub-domains. + static bool IsURIInPrefList(nsIURI* aURI, const char* aPrefName); + + /*& + * A convenience version of FormatLocalizedString that can be used if all the + * params are in same-typed strings. The variadic template args need to come + * at the end, so we put aResult at the beginning to make sure it's clear + * which is the output and which are the inputs. + */ + template <typename... T> + static nsresult FormatLocalizedString(nsAString& aResult, + PropertiesFile aFile, const char* aKey, + const T&... aParams) { + static_assert(sizeof...(aParams) != 0, "Use GetLocalizedString()"); + AutoTArray<nsString, sizeof...(aParams)> params = { + aParams..., + }; + return FormatLocalizedString(aFile, aKey, params, aResult); + } + + /** + * Same as FormatLocalizedString template version, except that it might use + * en-US locale depending on SpoofLocaleEnglish() and whether the document is + * a built-in browser page. + */ + template <typename... T> + static nsresult FormatMaybeLocalizedString(nsAString& aResult, + PropertiesFile aFile, + const char* aKey, + Document* aDocument, + const T&... aParams) { + static_assert(sizeof...(aParams) != 0, "Use GetMaybeLocalizedString()"); + AutoTArray<nsString, sizeof...(aParams)> params = { + aParams..., + }; + return FormatMaybeLocalizedString(aFile, aKey, aDocument, params, aResult); + } + + /** + * Fill (with the parameters given) the localized string named |aKey| in + * properties file |aFile| consuming an nsTArray of nsString parameters rather + * than a char16_t** for the sake of avoiding use-after-free errors involving + * temporaries. + */ + static nsresult FormatLocalizedString(PropertiesFile aFile, const char* aKey, + const nsTArray<nsString>& aParamArray, + nsAString& aResult); + + /** + * Same as FormatLocalizedString, except that it might use en-US locale + * depending on SpoofLocaleEnglish() and whether the document is a built-in + * browser page. + */ + static nsresult FormatMaybeLocalizedString( + PropertiesFile aFile, const char* aKey, Document* aDocument, + const nsTArray<nsString>& aParamArray, nsAString& aResult); + + /** + * Returns true if aDocument is a chrome document + */ + static bool IsChromeDoc(const Document* aDocument); + + /** + * Returns true if aDocument is in a docshell whose parent is the same type + */ + static bool IsChildOfSameType(Document* aDoc); + + /** + * Returns true if the content-type will be rendered as plain-text. + */ + static bool IsPlainTextType(const nsACString& aContentType); + + /** + * Returns true iff the type is rendered as plain text and doesn't support + * non-UTF-8 encodings. + */ + static bool IsUtf8OnlyPlainTextType(const nsACString& aContentType); + + /** + * Returns true if aDocument belongs to a chrome docshell for + * display purposes. Returns false for null documents or documents + * which do not belong to a docshell. + */ + static bool IsInChromeDocshell(const Document* aDocument); + + /** + * Return the content policy service + */ + static nsIContentPolicy* GetContentPolicy(); + + /** + * Map internal content policy types to external ones. + */ + static inline ExtContentPolicyType InternalContentPolicyTypeToExternal( + nsContentPolicyType aType); + + /** + * check whether the Link header field applies to the context resource + * see <http://tools.ietf.org/html/rfc5988#section-5.2> + */ + static bool LinkContextIsURI(const nsAString& aAnchor, nsIURI* aDocURI); + + /** + * Returns true if the content policy type is any of: + * * TYPE_INTERNAL_SCRIPT_PRELOAD + * * TYPE_INTERNAL_IMAGE_PRELOAD + * * TYPE_INTERNAL_STYLESHEET_PRELOAD + */ + static bool IsPreloadType(nsContentPolicyType aType); + + /** + * Returns true if the pref "security.mixed_content.upgrade_display_content" + * is true and the content policy type is any of: + * * TYPE_IMAGE + * * TYPE_MEDIA + */ + static bool IsUpgradableDisplayType(ExtContentPolicyType aType); + + /** + * Quick helper to determine whether there are any mutation listeners + * of a given type that apply to this content or any of its ancestors. + * The method has the side effect to call document's MayDispatchMutationEvent + * using aTargetForSubtreeModified as the parameter. + * + * @param aNode The node to search for listeners + * @param aType The type of listener (NS_EVENT_BITS_MUTATION_*) + * @param aTargetForSubtreeModified The node which is the target of the + * possible DOMSubtreeModified event. + * + * @return true if there are mutation listeners of the specified type + */ + static bool HasMutationListeners(nsINode* aNode, uint32_t aType, + nsINode* aTargetForSubtreeModified); + + /** + * Quick helper to determine whether there are any mutation listeners + * of a given type that apply to any content in this document. It is valid + * to pass null for aDocument here, in which case this function always + * returns true. + * + * @param aDocument The document to search for listeners + * @param aType The type of listener (NS_EVENT_BITS_MUTATION_*) + * + * @return true if there are mutation listeners of the specified type + */ + static bool HasMutationListeners(Document* aDocument, uint32_t aType); + /** + * Synchronously fire DOMNodeRemoved on aChild. Only fires the event if + * there really are listeners by checking using the HasMutationListeners + * function above. The function makes sure to hold the relevant objects alive + * for the duration of the event firing. However there are no guarantees + * that any of the objects are alive by the time the function returns. + * If you depend on that you need to hold references yourself. + * + * @param aChild The node to fire DOMNodeRemoved at. + * @param aParent The parent of aChild. + */ + MOZ_CAN_RUN_SCRIPT static void MaybeFireNodeRemoved(nsINode* aChild, + nsINode* aParent); + + /** + * These methods create and dispatch a trusted event. + * Works only with events which can be created by calling + * Document::CreateEvent() with parameter "Events". + * Note that don't use these methods for "input" event. Use + * DispatchInputEvent() instead. + * + * @param aDoc The document which will be used to create the event. + * @param aTarget The target of the event, should be QIable to + * EventTarget. + * @param aEventName The name of the event. + * @param aCanBubble Whether the event can bubble. + * @param aCancelable Is the event cancelable. + * @param aCopmosed Is the event composed. + * @param aDefaultAction Set to true if default action should be taken, + * see EventTarget::DispatchEvent. + */ + // TODO: annotate with `MOZ_CAN_RUN_SCRIPT` + // (https://bugzilla.mozilla.org/show_bug.cgi?id=1625902). + static nsresult DispatchTrustedEvent(Document* aDoc, nsISupports* aTarget, + const nsAString& aEventName, CanBubble, + Cancelable, + Composed aComposed = Composed::eDefault, + bool* aDefaultAction = nullptr); + + // TODO: annotate with `MOZ_CAN_RUN_SCRIPT` + // (https://bugzilla.mozilla.org/show_bug.cgi?id=1625902). + static nsresult DispatchTrustedEvent(Document* aDoc, nsISupports* aTarget, + const nsAString& aEventName, + CanBubble aCanBubble, + Cancelable aCancelable, + bool* aDefaultAction) { + return DispatchTrustedEvent(aDoc, aTarget, aEventName, aCanBubble, + aCancelable, Composed::eDefault, + aDefaultAction); + } + + /** + * This method creates and dispatches a trusted event using an event message. + * @param aDoc The document which will be used to create the event. + * @param aTarget The target of the event, should be QIable to + * EventTarget. + * @param aEventMessage The event message. + * @param aCanBubble Whether the event can bubble. + * @param aCancelable Is the event cancelable. + * @param aDefaultAction Set to true if default action should be taken, + * see EventTarget::DispatchEvent. + */ + template <class WidgetEventType> + static nsresult DispatchTrustedEvent( + Document* aDoc, nsISupports* aTarget, EventMessage aEventMessage, + CanBubble aCanBubble, Cancelable aCancelable, + bool* aDefaultAction = nullptr, + ChromeOnlyDispatch aOnlyChromeDispatch = ChromeOnlyDispatch::eNo) { + WidgetEventType event(true, aEventMessage); + MOZ_ASSERT(GetEventClassIDFromMessage(aEventMessage) == event.mClass); + return DispatchEvent(aDoc, aTarget, event, aEventMessage, aCanBubble, + aCancelable, Trusted::eYes, aDefaultAction, + aOnlyChromeDispatch); + } + + /** + * This method dispatches "beforeinput" event with EditorInputEvent or + * "input" event with proper event class. If it's unsafe to dispatch, + * this put the event into the script runner queue. In such case, the + * event becomes not cancelable even if it's defined as cancelable by + * the spec. + * Input Events spec defines as: + * Input events are dispatched on elements that act as editing hosts, + * including elements with the contenteditable attribute set, textarea + * elements, and input elements that permit text input. + * + * @param aEventTarget The event target element of the "beforeinput" + * or "input" event. Must not be nullptr. + * @param aEventMessage Muse be eEditorBeforeInput or eEditorInput. + * @param aEditorInputType The inputType value of InputEvent. + * If aEventTarget won't dispatch "input" event + * with InputEvent, set EditorInputType::eUnknown. + * @param aEditorBase Optional. If this is called by editor, + * editor should set this. Otherwise, leave + * nullptr. + * @param aOptions Optional. If aEditorInputType value requires + * some additional data, they should be properly + * set with this argument. + * @param aEventStatus Returns nsEventStatus_eConsumeNoDefault if + * the dispatching event is cancelable and the + * event was canceled by script (including + * chrome script). Otherwise, returns given + * value. Note that this can be nullptr only + * when the dispatching event is not cancelable. + */ + MOZ_CAN_RUN_SCRIPT static nsresult DispatchInputEvent(Element* aEventTarget); + MOZ_CAN_RUN_SCRIPT static nsresult DispatchInputEvent( + Element* aEventTarget, mozilla::EventMessage aEventMessage, + mozilla::EditorInputType aEditorInputType, + mozilla::EditorBase* aEditorBase, mozilla::InputEventOptions&& aOptions, + nsEventStatus* aEventStatus = nullptr); + + /** + * This method creates and dispatches a untrusted event. + * Works only with events which can be created by calling + * Document::CreateEvent() with parameter "Events". + * @param aDoc The document which will be used to create the event. + * @param aTarget The target of the event, should be QIable to + * EventTarget. + * @param aEventName The name of the event. + * @param aCanBubble Whether the event can bubble. + * @param aCancelable Is the event cancelable. + * @param aDefaultAction Set to true if default action should be taken, + * see EventTarget::DispatchEvent. + */ + static nsresult DispatchUntrustedEvent(Document* aDoc, nsISupports* aTarget, + const nsAString& aEventName, CanBubble, + Cancelable, + bool* aDefaultAction = nullptr); + + /** + * This method creates and dispatches a untrusted event using an event + * message. + * @param aDoc The document which will be used to create the event. + * @param aTarget The target of the event, should be QIable to + * EventTarget. + * @param aEventMessage The event message. + * @param aCanBubble Whether the event can bubble. + * @param aCancelable Is the event cancelable. + * @param aDefaultAction Set to true if default action should be taken, + * see EventTarget::DispatchEvent. + */ + template <class WidgetEventType> + static nsresult DispatchUntrustedEvent( + Document* aDoc, nsISupports* aTarget, EventMessage aEventMessage, + CanBubble aCanBubble, Cancelable aCancelable, + bool* aDefaultAction = nullptr, + ChromeOnlyDispatch aOnlyChromeDispatch = ChromeOnlyDispatch::eNo) { + WidgetEventType event(false, aEventMessage); + MOZ_ASSERT(GetEventClassIDFromMessage(aEventMessage) == event.mClass); + return DispatchEvent(aDoc, aTarget, event, aEventMessage, aCanBubble, + aCancelable, Trusted::eNo, aDefaultAction, + aOnlyChromeDispatch); + } + + /** + * This method creates and dispatches a trusted event to the chrome + * event handler (the parent object of the DOM Window in the event target + * chain). Note, chrome event handler is used even if aTarget is a chrome + * object. Use DispatchEventOnlyToChrome if the normal event dispatching is + * wanted in case aTarget is a chrome object. + * Works only with events which can be created by calling + * Document::CreateEvent() with parameter "Events". + * @param aDocument The document which will be used to create the event, + * and whose window's chrome handler will be used to + * dispatch the event. + * @param aTarget The target of the event, used for event->SetTarget() + * @param aEventName The name of the event. + * @param aCanBubble Whether the event can bubble. + * @param aCancelable Is the event cancelable. + * @param aDefaultAction Set to true if default action should be taken, + * see EventTarget::DispatchEvent. + */ + static nsresult DispatchChromeEvent(Document* aDoc, nsISupports* aTarget, + const nsAString& aEventName, CanBubble, + Cancelable, + bool* aDefaultAction = nullptr); + + /** + * Helper to dispatch a "framefocusrequested" event to chrome, which will only + * bring the window to the foreground and switch tabs if aCanRaise is true. + */ + MOZ_CAN_RUN_SCRIPT_BOUNDARY static void RequestFrameFocus( + Element& aFrameElement, bool aCanRaise, + mozilla::dom::CallerType aCallerType); + + /** + * This method creates and dispatches a trusted event. + * If aTarget is not a chrome object, the nearest chrome object in the + * propagation path will be used as the start of the event target chain. + * This method is different than DispatchChromeEvent, which always dispatches + * events to chrome event handler. DispatchEventOnlyToChrome works like + * DispatchTrustedEvent in the case aTarget is a chrome object. + * Works only with events which can be created by calling + * Document::CreateEvent() with parameter "Events". + * @param aDoc The document which will be used to create the event. + * @param aTarget The target of the event, should be QIable to + * EventTarget. + * @param aEventName The name of the event. + * @param aCanBubble Whether the event can bubble. + * @param aCancelable Is the event cancelable. + * @param aComposed Is the event composed. + * @param aDefaultAction Set to true if default action should be taken, + * see EventTarget::DispatchEvent. + */ + static nsresult DispatchEventOnlyToChrome( + Document* aDoc, nsISupports* aTarget, const nsAString& aEventName, + CanBubble, Cancelable, Composed aComposed = Composed::eDefault, + bool* aDefaultAction = nullptr); + + static nsresult DispatchEventOnlyToChrome( + Document* aDoc, nsISupports* aTarget, const nsAString& aEventName, + CanBubble aCanBubble, Cancelable aCancelable, bool* aDefaultAction) { + return DispatchEventOnlyToChrome(aDoc, aTarget, aEventName, aCanBubble, + aCancelable, Composed::eDefault, + aDefaultAction); + } + + /** + * Determines if an event attribute name (such as onclick) is valid for + * a given element type. Types are from the EventNameType enumeration + * defined above. + * + * @param aName the event name to look up + * @param aType the type of content + */ + static bool IsEventAttributeName(nsAtom* aName, int32_t aType); + + /** + * Return the event message for the event with the given name. The name is + * the event name with the 'on' prefix. Returns eUnidentifiedEvent if the + * event doesn't match a known event name. + * + * @param aName the event name to look up + */ + static EventMessage GetEventMessage(nsAtom* aName); + + /** + * Returns the EventMessage and nsAtom to be used for event listener + * registration. + */ + static EventMessage GetEventMessageAndAtomForListener(const nsAString& aName, + nsAtom** aOnName); + + /** + * Return the EventClassID for the event with the given name. The name is the + * event name *without* the 'on' prefix. Returns eBasicEventClass if the event + * is not known to be of any particular event class. + * + * @param aName the event name to look up + */ + static mozilla::EventClassID GetEventClassID(const nsAString& aName); + + /** + * Return the event message and atom for the event with the given name. + * The name is the event name *without* the 'on' prefix. + * Returns eUnidentifiedEvent on the aEventID if the + * event doesn't match a known event name in the category. + * + * @param aName the event name to look up + * @param aEventClassID only return event id for aEventClassID + */ + static nsAtom* GetEventMessageAndAtom(const nsAString& aName, + mozilla::EventClassID aEventClassID, + EventMessage* aEventMessage); + + /** + * Used only during traversal of the XPCOM graph by the cycle + * collector: push a pointer to the listener manager onto the + * children deque, if it exists. Do nothing if there is no listener + * manager. + * + * Crucially: does not perform any refcounting operations. + * + * @param aNode The node to traverse. + * @param children The buffer to push a listener manager pointer into. + */ + static void TraverseListenerManager(nsINode* aNode, + nsCycleCollectionTraversalCallback& cb); + + /** + * Get the eventlistener manager for aNode, creating it if it does not + * already exist. + * + * @param aNode The node for which to get the eventlistener manager. + */ + static mozilla::EventListenerManager* GetListenerManagerForNode( + nsINode* aNode); + /** + * Get the eventlistener manager for aNode, returning null if it does not + * already exist. + * + * @param aNode The node for which to get the eventlistener manager. + */ + static mozilla::EventListenerManager* GetExistingListenerManagerForNode( + const nsINode* aNode); + + static void AddEntryToDOMArenaTable(nsINode* aNode, + mozilla::dom::DOMArena* aDOMArena); + + static already_AddRefed<mozilla::dom::DOMArena> TakeEntryFromDOMArenaTable( + const nsINode* aNode); + + static void UnmarkGrayJSListenersInCCGenerationDocuments(); + + /** + * Remove the eventlistener manager for aNode. + * + * @param aNode The node for which to remove the eventlistener manager. + */ + static void RemoveListenerManager(nsINode* aNode); + + static bool IsInitialized() { return sInitialized; } + + /** + * Checks if the localname/prefix/namespace triple is valid wrt prefix + * and namespace according to the Namespaces in XML and DOM Code + * specfications. + * + * @param aLocalname localname of the node + * @param aPrefix prefix of the node + * @param aNamespaceID namespace of the node + */ + static bool IsValidNodeName(nsAtom* aLocalName, nsAtom* aPrefix, + int32_t aNamespaceID); + + /** + * Creates a DocumentFragment from text using a context node to resolve + * namespaces. + * + * Please note that for safety reasons, if the node principal of + * aContextNode is the system principal, this function will automatically + * sanitize its input using nsTreeSanitizer. + * + * Note! In the HTML case with the HTML5 parser enabled, this is only called + * from Range.createContextualFragment() and the implementation here is + * quirky accordingly (html context node behaves like a body context node). + * If you don't want that quirky behavior, don't use this method as-is! + * + * @param aContextNode the node which is used to resolve namespaces + * @param aFragment the string which is parsed to a DocumentFragment + * @param aReturn the resulting fragment + * @param aPreventScriptExecution whether to mark scripts as already started + */ + static already_AddRefed<mozilla::dom::DocumentFragment> + CreateContextualFragment(nsINode* aContextNode, const nsAString& aFragment, + bool aPreventScriptExecution, + mozilla::ErrorResult& aRv); + + /** + * Invoke the fragment parsing algorithm (innerHTML) using the HTML parser. + * + * Please note that for safety reasons, if the node principal of aTargetNode + * is the system principal, this function will automatically sanitize its + * input using nsTreeSanitizer. + * + * @param aSourceBuffer the string being set as innerHTML + * @param aTargetNode the target container + * @param aContextLocalName local name of context node + * @param aContextNamespace namespace of context node + * @param aQuirks true to make <table> not close <p> + * @param aPreventScriptExecution true to prevent scripts from executing; + * don't set to false when parsing into a target node that has been + * bound to tree. + * @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse + * fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too + * long and NS_OK otherwise. + * @param aFlags defaults to -1 indicating that ParseFragmentHTML will do + * default sanitization for system privileged calls to it. Only + * ParserUtils::ParseFragment() should ever pass explicit aFlags + * which will then used for sanitization of the fragment. + * To pass explicit aFlags use any of the sanitization flags + * listed in nsIParserUtils.idl. + */ + static nsresult ParseFragmentHTML(const nsAString& aSourceBuffer, + nsIContent* aTargetNode, + nsAtom* aContextLocalName, + int32_t aContextNamespace, bool aQuirks, + bool aPreventScriptExecution, + int32_t aFlags = -1); + + /** + * Invoke the fragment parsing algorithm (innerHTML) using the XML parser. + * + * Please note that for safety reasons, if the node principal of aDocument + * is the system principal, this function will automatically sanitize its + * input using nsTreeSanitizer. + * + * @param aSourceBuffer the string being set as innerHTML + * @param aDocument the target document + * @param aTagStack the namespace mapping context + * @param aPreventExecution whether to mark scripts as already started + * @param aFlags, pass -1 and ParseFragmentXML will do default + * sanitization for system privileged calls to it. Only + * ParserUtils::ParseFragment() should ever pass explicit aFlags + * which will then used for sanitization of the fragment. + * To pass explicit aFlags use any of the sanitization flags + * listed in nsIParserUtils.idl. + * @param aReturn the result fragment + * @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse + * fragments is made, a return code from the XML parser. + */ + static nsresult ParseFragmentXML(const nsAString& aSourceBuffer, + Document* aDocument, + nsTArray<nsString>& aTagStack, + bool aPreventScriptExecution, int32_t aFlags, + mozilla::dom::DocumentFragment** aReturn); + + /** + * Parse a string into a document using the HTML parser. + * Script elements are marked unexecutable. + * + * @param aSourceBuffer the string to parse as an HTML document + * @param aTargetDocument the document object to parse into. Must not have + * child nodes. + * @param aScriptingEnabledForNoscriptParsing whether <noscript> is parsed + * as if scripting was enabled + * @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse + * fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too + * long and NS_OK otherwise. + */ + static nsresult ParseDocumentHTML(const nsAString& aSourceBuffer, + Document* aTargetDocument, + bool aScriptingEnabledForNoscriptParsing); + + /** + * Converts HTML source to plain text by parsing the source and using the + * plain text serializer on the resulting tree. + * + * @param aSourceBuffer the string to parse as an HTML document + * @param aResultBuffer the string where the plain text result appears; + * may be the same string as aSourceBuffer + * @param aFlags Flags from nsIDocumentEncoder. + * @param aWrapCol Number of columns after which to line wrap; 0 for no + * auto-wrapping + * @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse + * fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too + * long and NS_OK otherwise. + */ + static nsresult ConvertToPlainText(const nsAString& aSourceBuffer, + nsAString& aResultBuffer, uint32_t aFlags, + uint32_t aWrapCol); + + /** + * Creates a 'loaded-as-data' HTML document that takes that principal, + * script global, and URL from the argument, which may be null. + */ + static already_AddRefed<Document> CreateInertHTMLDocument( + const Document* aTemplate); + + /** + * Creates a 'loaded-as-data' XML document that takes that principal, + * script global, and URL from the argument, which may be null. + */ + static already_AddRefed<Document> CreateInertXMLDocument( + const Document* aTemplate); + + public: + /** + * Sets the text contents of a node by replacing all existing children + * with a single text child. + * + * The function always notifies. + * + * Will reuse the first text child if one is available. Will not reuse + * existing cdata children. + * + * TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230) + * + * @param aContent Node to set contents of. + * @param aValue Value to set contents to. + * @param aTryReuse When true, the function will try to reuse an existing + * textnodes rather than always creating a new one. + */ + MOZ_CAN_RUN_SCRIPT_BOUNDARY static nsresult SetNodeTextContent( + nsIContent* aContent, const nsAString& aValue, bool aTryReuse); + + /** + * Get the textual contents of a node. This is a concatenation of all + * textnodes that are direct or (depending on aDeep) indirect children + * of the node. + * + * NOTE! No serialization takes place and <br> elements + * are not converted into newlines. Only textnodes and cdata nodes are + * added to the result. + * + * @see nsLayoutUtils::GetFrameTextContent + * + * @param aNode Node to get textual contents of. + * @param aDeep If true child elements of aNode are recursivly descended + * into to find text children. + * @param aResult the result. Out param. + * @return false on out of memory errors, true otherwise. + */ + [[nodiscard]] static bool GetNodeTextContent(const nsINode* aNode, bool aDeep, + nsAString& aResult, + const mozilla::fallible_t&); + + static void GetNodeTextContent(const nsINode* aNode, bool aDeep, + nsAString& aResult); + + /** + * Same as GetNodeTextContents but appends the result rather than sets it. + */ + static bool AppendNodeTextContent(const nsINode* aNode, bool aDeep, + nsAString& aResult, + const mozilla::fallible_t&); + + /** + * Utility method that checks if a given node has any non-empty children. This + * method does not descend recursively into children by default. + * + * @param aDiscoverMode Set to eRecurseIntoChildren to descend recursively + * into children. + */ + enum TextContentDiscoverMode : uint8_t { + eRecurseIntoChildren, + eDontRecurseIntoChildren + }; + + static bool HasNonEmptyTextContent( + nsINode* aNode, + TextContentDiscoverMode aDiscoverMode = eDontRecurseIntoChildren); + + /** + * Delete strings allocated for nsContentList matches + */ + static void DestroyMatchString(void* aData); + + /* + * Notify when the first XUL menu is opened and when the all XUL menus are + * closed. At opening, aInstalling should be TRUE, otherwise, it should be + * FALSE. + */ + MOZ_CAN_RUN_SCRIPT static void NotifyInstalledMenuKeyboardListener( + bool aInstalling); + + /** + * Check whether the nsIURI uses the given scheme. + * + * Note that this will check the innermost URI rather than that of + * the nsIURI itself. + */ + static bool SchemeIs(nsIURI* aURI, const char* aScheme); + + /** + * Returns true if aPrincipal is an ExpandedPrincipal. + */ + static bool IsExpandedPrincipal(nsIPrincipal* aPrincipal); + + /** + * Returns true if aPrincipal is the system or an ExpandedPrincipal. + */ + static bool IsSystemOrExpandedPrincipal(nsIPrincipal* aPrincipal); + + /** + * Gets the system principal from the security manager. + */ + static nsIPrincipal* GetSystemPrincipal(); + + /** + * Gets the null subject principal singleton. This is only useful for + * assertions. + */ + static nsIPrincipal* GetNullSubjectPrincipal() { + return sNullSubjectPrincipal; + } + + /** + * *aResourcePrincipal is a principal describing who may access the contents + * of a resource. The resource can only be consumed by a principal that + * subsumes *aResourcePrincipal. MAKE SURE THAT NOTHING EVER ACTS WITH THE + * AUTHORITY OF *aResourcePrincipal. + * It may be null to indicate that the resource has no data from any origin + * in it yet and anything may access the resource. + * Additional data is being mixed into the resource from aExtraPrincipal + * (which may be null; if null, no data is being mixed in and this function + * will do nothing). Update *aResourcePrincipal to reflect the new data. + * If *aResourcePrincipal subsumes aExtraPrincipal, nothing needs to change, + * otherwise *aResourcePrincipal is replaced with the system principal. + * Returns true if *aResourcePrincipal changed. + */ + static bool CombineResourcePrincipals( + nsCOMPtr<nsIPrincipal>* aResourcePrincipal, + nsIPrincipal* aExtraPrincipal); + + /** + * Trigger a link with uri aLinkURI. If aClick is false, this triggers a + * mouseover on the link, otherwise it triggers a load after doing a + * security check using aContent's principal. + * + * @param aContent the node on which a link was triggered. + * @param aLinkURI the URI of the link, must be non-null. + * @param aTargetSpec the target (like target=, may be empty). + * @param aClick whether this was a click or not (if false, this method + * assumes you just hovered over the link). + * @param aIsTrusted If false, JS Context will be pushed to stack + * when the link is triggered. + */ + static void TriggerLink(nsIContent* aContent, nsIURI* aLinkURI, + const nsString& aTargetSpec, bool aClick, + bool aIsTrusted); + + /** + * Get the link location. + */ + static void GetLinkLocation(mozilla::dom::Element* aElement, + nsString& aLocationString); + + /** + * Return top-level widget in the parent chain. + */ + static nsIWidget* GetTopLevelWidget(nsIWidget* aWidget); + + /** + * Return the localized ellipsis for UI. + */ + static const nsDependentString GetLocalizedEllipsis(); + + /** + * Hide any XUL popups associated with aDocument, including any documents + * displayed in child frames. Does nothing if aDocument is null. + */ + MOZ_CAN_RUN_SCRIPT_BOUNDARY static void HidePopupsInDocument( + Document* aDocument); + + /** + * Retrieve the current drag session, or null if no drag is currently occuring + */ + static already_AddRefed<nsIDragSession> GetDragSession(); + + /* + * Initialize and set the dataTransfer field of an WidgetDragEvent. + */ + static nsresult SetDataTransferInEvent(mozilla::WidgetDragEvent* aDragEvent); + + // filters the drag and drop action to fit within the effects allowed and + // returns it. + static uint32_t FilterDropEffect(uint32_t aAction, uint32_t aEffectAllowed); + + /* + * Return true if the target of a drop event is a content document that is + * an ancestor of the document for the source of the drag. + */ + static bool CheckForSubFrameDrop(nsIDragSession* aDragSession, + mozilla::WidgetDragEvent* aDropEvent); + + /** + * Return true if aURI is a local file URI (i.e. file://). + */ + static bool URIIsLocalFile(nsIURI* aURI); + + /** + * Get the application manifest URI for this document. The manifest URI + * is specified in the manifest= attribute of the root element of the + * document. + * + * @param aDocument The document that lists the manifest. + * @param aURI The manifest URI. + */ + static void GetOfflineAppManifest(Document* aDocument, nsIURI** aURI); + + /** + * Check whether an application should be allowed to use offline APIs. + */ + static bool OfflineAppAllowed(nsIURI* aURI); + + /** + * Check whether an application should be allowed to use offline APIs. + */ + static bool OfflineAppAllowed(nsIPrincipal* aPrincipal); + + /** + * Increases the count of blockers preventing scripts from running. + * NOTE: You might want to use nsAutoScriptBlocker rather than calling + * this directly + */ + static void AddScriptBlocker(); + + /** + * Decreases the count of blockers preventing scripts from running. + * NOTE: You might want to use nsAutoScriptBlocker rather than calling + * this directly + * + * WARNING! Calling this function could synchronously execute scripts. + */ + static void RemoveScriptBlocker(); + + /** + * Add a runnable that is to be executed as soon as it's safe to execute + * scripts. + * NOTE: If it's currently safe to execute scripts, aRunnable will be run + * synchronously before the function returns. + * + * @param aRunnable The nsIRunnable to run as soon as it's safe to execute + * scripts. Passing null is allowed and results in nothing + * happening. It is also allowed to pass an object that + * has not yet been AddRefed. + */ + static void AddScriptRunner(already_AddRefed<nsIRunnable> aRunnable); + static void AddScriptRunner(nsIRunnable* aRunnable); + + /** + * Returns true if it's safe to execute content script and false otherwise. + * + * The only known case where this lies is mutation events. They run, and can + * run anything else, when this function returns false, but this is ok. + */ + static bool IsSafeToRunScript(); + + // Returns the browser window with the most recent time stamp that is + // not in private browsing mode. + static already_AddRefed<nsPIDOMWindowOuter> GetMostRecentNonPBWindow(); + + /** + * Call this function if !IsSafeToRunScript() and we fail to run the script + * (rather than using AddScriptRunner as we usually do). |aDocument| is + * optional as it is only used for showing the URL in the console. + */ + static void WarnScriptWasIgnored(Document* aDocument); + + /** + * Add a "synchronous section", in the form of an nsIRunnable run once the + * event loop has reached a "stable state". |aRunnable| must not cause any + * queued events to be processed (i.e. must not spin the event loop). + * We've reached a stable state when the currently executing task/event has + * finished, see + * http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#synchronous-section + * In practice this runs aRunnable once the currently executing event + * finishes. If called multiple times per task/event, all the runnables will + * be executed, in the order in which RunInStableState() was called. + */ + static void RunInStableState(already_AddRefed<nsIRunnable> aRunnable); + + /* Add a pending IDBTransaction to be cleaned up at the end of performing a + * microtask checkpoint. + * See the step of "Cleanup Indexed Database Transactions" in + * https://html.spec.whatwg.org/multipage/webappapis.html#perform-a-microtask-checkpoint + */ + static void AddPendingIDBTransaction( + already_AddRefed<nsIRunnable> aTransaction); + + /** + * Returns true if we are doing StableState/MetastableState. + */ + static bool IsInStableOrMetaStableState(); + + static JSContext* GetCurrentJSContext(); + + /** + * Case insensitive comparison between two atoms. + */ + static bool EqualsIgnoreASCIICase(nsAtom* aAtom1, nsAtom* aAtom2); + + /** + * Case insensitive comparison between two strings. However it only ignores + * case for ASCII characters a-z. + */ + static bool EqualsIgnoreASCIICase(const nsAString& aStr1, + const nsAString& aStr2); + + /** + * Convert ASCII A-Z to a-z. + */ + static void ASCIIToLower(nsAString& aStr); + static void ASCIIToLower(nsACString& aStr); + static void ASCIIToLower(const nsAString& aSource, nsAString& aDest); + static void ASCIIToLower(const nsACString& aSource, nsACString& aDest); + + /** + * Convert ASCII a-z to A-Z. + */ + static void ASCIIToUpper(nsAString& aStr); + static void ASCIIToUpper(nsACString& aStr); + static void ASCIIToUpper(const nsAString& aSource, nsAString& aDest); + static void ASCIIToUpper(const nsACString& aSource, nsACString& aDest); + + /** + * Return whether aStr contains an ASCII uppercase character. + */ + static bool StringContainsASCIIUpper(const nsAString& aStr); + + // Returns NS_OK for same origin, error (NS_ERROR_DOM_BAD_URI) if not. + static nsresult CheckSameOrigin(nsIChannel* aOldChannel, + nsIChannel* aNewChannel); + static nsIInterfaceRequestor* SameOriginChecker(); + + /** + * Get the Origin of the passed in nsIPrincipal or nsIURI. If the passed in + * nsIURI or the URI of the passed in nsIPrincipal does not have a host, the + * origin is set to 'null'. + * + * The ASCII versions return a ASCII strings that are puny-code encoded, + * suitable for, for example, header values. The UTF versions return strings + * containing international characters. + * + * The thread-safe versions return NS_ERROR_UNKNOWN_PROTOCOL if the + * operation cannot be completed on the current thread. + * + * @pre aPrincipal/aOrigin must not be null. + * + * @note this should be used for HTML5 origin determination. + */ + static nsresult GetASCIIOrigin(nsIURI* aURI, nsACString& aOrigin); + static nsresult GetUTFOrigin(nsIPrincipal* aPrincipal, nsAString& aOrigin); + static nsresult GetUTFOrigin(nsIURI* aURI, nsAString& aOrigin); + + /** + * This method creates and dispatches "command" event, which implements + * XULCommandEvent. + * If aPresShell is not null, dispatching goes via + * PresShell::HandleDOMEventWithTarget(). + */ + MOZ_CAN_RUN_SCRIPT + static nsresult DispatchXULCommand( + nsIContent* aTarget, bool aTrusted, + mozilla::dom::Event* aSourceEvent = nullptr, + mozilla::PresShell* aPresShell = nullptr, bool aCtrl = false, + bool aAlt = false, bool aShift = false, bool aMeta = false, + // Including MouseEventBinding here leads + // to incude loops, unfortunately. + uint16_t inputSource = 0 /* MouseEvent_Binding::MOZ_SOURCE_UNKNOWN */, + int16_t aButton = 0); + + static bool CheckMayLoad(nsIPrincipal* aPrincipal, nsIChannel* aChannel, + bool aAllowIfInheritsPrincipal); + + /** + * The method checks whether the caller can access native anonymous content. + * If there is no JS in the stack or privileged JS is running, this + * method returns true, otherwise false. + */ + static bool CanAccessNativeAnon(); + + [[nodiscard]] static nsresult WrapNative(JSContext* cx, nsISupports* native, + const nsIID* aIID, + JS::MutableHandle<JS::Value> vp, + bool aAllowWrapping = true) { + return WrapNative(cx, native, nullptr, aIID, vp, aAllowWrapping); + } + + // Same as the WrapNative above, but use this one if aIID is nsISupports' IID. + [[nodiscard]] static nsresult WrapNative(JSContext* cx, nsISupports* native, + JS::MutableHandle<JS::Value> vp, + bool aAllowWrapping = true) { + return WrapNative(cx, native, nullptr, nullptr, vp, aAllowWrapping); + } + + [[nodiscard]] static nsresult WrapNative(JSContext* cx, nsISupports* native, + nsWrapperCache* cache, + JS::MutableHandle<JS::Value> vp, + bool aAllowWrapping = true) { + return WrapNative(cx, native, cache, nullptr, vp, aAllowWrapping); + } + + /** + * Creates an arraybuffer from a binary string. + */ + static nsresult CreateArrayBuffer(JSContext* aCx, const nsACString& aData, + JSObject** aResult); + + static void StripNullChars(const nsAString& aInStr, nsAString& aOutStr); + + /** + * Strip all \n, \r and nulls from the given string + * @param aString the string to remove newlines from [in/out] + */ + static void RemoveNewlines(nsString& aString); + + /** + * Convert Windows and Mac platform linebreaks to \n. + * @param aString the string to convert the newlines inside [in/out] + */ + static void PlatformToDOMLineBreaks(nsString& aString); + [[nodiscard]] static bool PlatformToDOMLineBreaks(nsString& aString, + const mozilla::fallible_t&); + + /** + * Populates aResultString with the contents of the string-buffer aBuf, up + * to aBuf's null-terminator. aBuf must not be null. Ownership of the string + * is not transferred. + */ + static void PopulateStringFromStringBuffer(nsStringBuffer* aBuf, + nsAString& aResultString); + + static bool IsHandlingKeyBoardEvent() { return sIsHandlingKeyBoardEvent; } + + static void SetIsHandlingKeyBoardEvent(bool aHandling) { + sIsHandlingKeyBoardEvent = aHandling; + } + + /** + * Utility method for getElementsByClassName. aRootNode is the node (either + * document or element), which getElementsByClassName was called on. + */ + static already_AddRefed<nsContentList> GetElementsByClassName( + nsINode* aRootNode, const nsAString& aClasses); + + /** + * Returns a presshell for this document, if there is one. This will be + * aDoc's direct presshell if there is one, otherwise we'll look at all + * ancestor documents to try to find a presshell, so for example this can + * still find a presshell for documents in display:none frames that have + * no presentation. So you have to be careful how you use this presshell --- + * getting generic data like a device context or widget from it is OK, but it + * might not be this document's actual presentation. + */ + static mozilla::PresShell* FindPresShellForDocument( + const Document* aDocument); + + /** + * Like FindPresShellForDocument, but returns the shell's PresContext instead. + */ + static nsPresContext* FindPresContextForDocument(const Document* aDocument); + + /** + * Returns the widget for this document if there is one. Looks at all ancestor + * documents to try to find a widget, so for example this can still find a + * widget for documents in display:none frames that have no presentation. + * + * You should probably use WidgetForContent() instead of this, unless you have + * a good reason to do otherwise. + */ + static nsIWidget* WidgetForDocument(const Document* aDocument); + + /** + * Returns the appropriate widget for this element, if there is one. Unlike + * WidgetForDocument(), this returns the correct widget for content in popups. + * + * You should probably use this instead of WidgetForDocument(). + */ + static nsIWidget* WidgetForContent(const nsIContent* aContent); + + /** + * Returns a window renderer to use for the given document. Basically we + * look up the document hierarchy for the first document which has + * a presentation with an associated widget, and use that widget's + * window renderer. + * + * You should probably use WindowRendererForContent() instead of this, unless + * you have a good reason to do otherwise. + * + * @param aDoc the document for which to return a window renderer. + * @param aAllowRetaining an outparam that states whether the returned + * layer manager should be used for retained layers + */ + static mozilla::WindowRenderer* WindowRendererForDocument( + const Document* aDoc); + + /** + * Returns a window renderer to use for the given content. Unlike + * WindowRendererForDocument(), this returns the correct window renderer for + * content in popups. + * + * You should probably use this instead of WindowRendererForDocument(). + */ + static mozilla::WindowRenderer* WindowRendererForContent( + const nsIContent* aContent); + + /** + * Determine whether a content node is focused or not, + * + * @param aContent the content node to check + * @return true if the content node is focused, false otherwise. + */ + static bool IsFocusedContent(const nsIContent* aContent); + + /** + * Returns true if calling execCommand with 'cut' or 'copy' arguments is + * allowed for the given subject principal. These are only allowed if the user + * initiated them (like with a mouse-click or key press). + */ + static bool IsCutCopyAllowed(Document* aDocument, + nsIPrincipal& aSubjectPrincipal); + + /* + * Returns true if the browser should attempt to prevent the given caller type + * from collecting distinctive information about the browser that could + * be used to "fingerprint" and track the user across websites. + */ + static bool ResistFingerprinting(mozilla::dom::CallerType aCallerType) { + return aCallerType != mozilla::dom::CallerType::System && + ShouldResistFingerprinting(); + } + + /** + * Returns true if CSSOM origin check should be skipped for WebDriver + * based crawl to be able to collect data from cross-origin CSS style + * sheets. This can be enabled by setting environment variable + * MOZ_BYPASS_CSSOM_ORIGIN_CHECK. + */ + static bool BypassCSSOMOriginCheck() { +#ifdef RELEASE_OR_BETA + return false; +#else + return sBypassCSSOMOriginCheck; +#endif + } + + /** + * Fire mutation events for changes caused by parsing directly into a + * context node. + * + * @param aDoc the document of the node + * @param aDest the destination node that got stuff appended to it + * @param aOldChildCount the number of children the node had before parsing + */ + static void FireMutationEventsForDirectParsing(Document* aDoc, + nsIContent* aDest, + int32_t aOldChildCount); + + /** + * Returns true if the content is in a document and contains a plugin + * which we don't control event dispatch for, i.e. do any plugins in this + * doc tree receive key events outside of our control? This always returns + * false on MacOSX. + */ + static bool HasPluginWithUncontrolledEventDispatch(nsIContent* aContent); + + /** + * Returns the in-process subtree root document in a document hierarchy. + * This could be a chrome document. + */ + static Document* GetInProcessSubtreeRootDocument(Document* aDoc) { + return const_cast<Document*>( + GetInProcessSubtreeRootDocument(const_cast<const Document*>(aDoc))); + } + static const Document* GetInProcessSubtreeRootDocument(const Document* aDoc); + + static void GetShiftText(nsAString& text); + static void GetControlText(nsAString& text); + static void GetMetaText(nsAString& text); + static void GetOSText(nsAString& text); + static void GetAltText(nsAString& text); + static void GetModifierSeparatorText(nsAString& text); + + /** + * Returns if aContent has the 'scrollgrab' property. + * aContent may be null (in this case false is returned). + */ + static bool HasScrollgrab(nsIContent* aContent); + + /** + * Flushes the layout tree (recursively) + * + * @param aWindow the window the flush should start at + * + */ + static void FlushLayoutForTree(nsPIDOMWindowOuter* aWindow); + + /** + * Returns true if content with the given principal is allowed to use XUL + * and XBL and false otherwise. + */ + static bool AllowXULXBLForPrincipal(nsIPrincipal* aPrincipal); + + /** + * Perform cleanup that's appropriate for XPCOM shutdown. + */ + static void XPCOMShutdown(); + + /** + * Checks if internal PDF viewer is enabled. + */ + static bool IsPDFJSEnabled(); + + /** + * Checks to see whether the given principal is the internal PDF + * viewer principal. + */ + static bool IsPDFJS(nsIPrincipal* aPrincipal); + /** + * Same, but from WebIDL bindings. Checks whether the subject principal is for + * the internal PDF viewer or system JS. + */ + static bool IsSystemOrPDFJS(JSContext*, JSObject*); + + /** + * Checks if internal SWF player is enabled. + */ + static bool IsSWFPlayerEnabled(); + + enum ContentViewerType { + TYPE_UNSUPPORTED, + TYPE_CONTENT, + TYPE_FALLBACK, + TYPE_UNKNOWN + }; + + static already_AddRefed<nsIDocumentLoaderFactory> FindInternalContentViewer( + const nsACString& aType, ContentViewerType* aLoaderType = nullptr); + + /** + * This helper method returns true if the aPattern pattern matches aValue. + * aPattern should not contain leading and trailing slashes (/). + * The pattern has to match the entire value not just a subset. + * aDocument must be a valid pointer (not null). + * + * This is following the HTML5 specification: + * http://dev.w3.org/html5/spec/forms.html#attr-input-pattern + * + * WARNING: This method mutates aPattern and aValue! + * + * @param aValue the string to check. + * @param aPattern the string defining the pattern. + * @param aDocument the owner document of the element. + * @param aHasMultiple whether or not there are multiple values. + * @result whether the given string is matches the pattern, or + * Nothing() if the pattern couldn't be evaluated. + */ + static mozilla::Maybe<bool> IsPatternMatching(nsAString& aValue, + nsAString& aPattern, + const Document* aDocument, + bool aHasMultiple = false); + + /** + * Calling this adds support for + * ontouch* event handler DOM attributes. + */ + static void InitializeTouchEventTable(); + + /** + * Test whether the given URI always inherits a security context + * from the document it comes from. + */ + static nsresult URIInheritsSecurityContext(nsIURI* aURI, bool* aResult); + + /** + * Called before a channel is created to query whether the new + * channel should inherit the principal. + * + * The argument aLoadingPrincipal must not be null. The argument + * aURI must be the URI of the new channel. If aInheritForAboutBlank + * is true, then about:blank will be told to inherit the principal. + * If aForceInherit is true, the new channel will be told to inherit + * the principal no matter what. + * + * The return value is whether the new channel should inherit + * the principal. + */ + static bool ChannelShouldInheritPrincipal(nsIPrincipal* aLoadingPrincipal, + nsIURI* aURI, + bool aInheritForAboutBlank, + bool aForceInherit); + + static nsresult Btoa(const nsAString& aBinaryData, + nsAString& aAsciiBase64String); + + static nsresult Atob(const nsAString& aAsciiString, nsAString& aBinaryData); + + /** + * Returns whether the input element passed in parameter has the autocomplete + * functionality enabled. It is taking into account the form owner. + * NOTE: the caller has to make sure autocomplete makes sense for the + * element's type. + * + * @param aInput the input element to check. NOTE: aInput can't be null. + * @return whether the input element has autocomplete enabled. + */ + static bool IsAutocompleteEnabled(mozilla::dom::HTMLInputElement* aInput); + + enum AutocompleteAttrState : uint8_t { + eAutocompleteAttrState_Unknown = 1, + eAutocompleteAttrState_Invalid, + eAutocompleteAttrState_Valid, + }; + /** + * Parses the value of the autocomplete attribute into aResult, ensuring it's + * composed of valid tokens, otherwise the value "" is used. + * Note that this method is used for form fields, not on a <form> itself. + * + * @return whether aAttr was valid and can be cached. + */ + static AutocompleteAttrState SerializeAutocompleteAttribute( + const nsAttrValue* aAttr, nsAString& aResult, + AutocompleteAttrState aCachedState = eAutocompleteAttrState_Unknown); + + /* Variation that is used to retrieve a dictionary of the parts of the + * autocomplete attribute. + * + * @return whether aAttr was valid and can be cached. + */ + static AutocompleteAttrState SerializeAutocompleteAttribute( + const nsAttrValue* aAttr, mozilla::dom::AutocompleteInfo& aInfo, + AutocompleteAttrState aCachedState = eAutocompleteAttrState_Unknown, + bool aGrantAllValidValue = false); + + /** + * This will parse aSource, to extract the value of the pseudo attribute + * with the name specified in aName. See + * http://www.w3.org/TR/xml-stylesheet/#NT-StyleSheetPI for the specification + * which is used to parse aSource. + * + * @param aSource the string to parse + * @param aName the name of the attribute to get the value for + * @param aValue [out] the value for the attribute with name specified in + * aAttribute. Empty if the attribute isn't present. + * @return true if the attribute exists and was successfully parsed. + * false if the attribute doesn't exist, or has a malformed + * value, such as an unknown or unterminated entity. + */ + static bool GetPseudoAttributeValue(const nsString& aSource, nsAtom* aName, + nsAString& aValue); + + /** + * Returns true if the language name is a version of JavaScript and + * false otherwise + */ + static bool IsJavaScriptLanguage(const nsString& aName); + + static bool IsJavascriptMIMEType(const nsAString& aMIMEType); + + static void SplitMimeType(const nsAString& aValue, nsString& aType, + nsString& aParams); + + /** + * Takes a selection, and a text control element (<input> or <textarea>), and + * returns the offsets in the text content corresponding to the selection. + * The selection's anchor and focus must both be in the root node passed or a + * descendant. + * + * @param aSelection Selection to check + * @param aRoot Root <input> or <textarea> element + * @param aOutStartOffset Output start offset + * @param aOutEndOffset Output end offset + */ + static void GetSelectionInTextControl(mozilla::dom::Selection* aSelection, + Element* aRoot, + uint32_t& aOutStartOffset, + uint32_t& aOutEndOffset); + + /** + * Takes a frame for anonymous content within a text control (<input> or + * <textarea>), and returns an offset in the text content, adjusted for a + * trailing <br> frame. + * + * @param aOffsetFrame Frame for the text content in which the offset + * lies + * @param aOffset Offset as calculated by GetContentOffsetsFromPoint + * @param aOutOffset Output adjusted offset + * + * @see GetSelectionInTextControl for the original basis of this function. + */ + static int32_t GetAdjustedOffsetInTextControl(nsIFrame* aOffsetFrame, + int32_t aOffset); + + /** + * Returns pointer to HTML editor instance for the aPresContext when there is. + * The HTML editor is shared by contenteditable elements or used in + * designMode. When there are no contenteditable elements and the document + * is not in designMode, this returns nullptr. + */ + static mozilla::HTMLEditor* GetHTMLEditor(nsPresContext* aPresContext); + static mozilla::HTMLEditor* GetHTMLEditor(nsDocShell* aDocShell); + + /** + * Returns pointer to a text editor if <input> or <textarea> element is + * active element in the document for aPresContext, or pointer to HTML + * editor if there is (i.e., even if non-editable element has focus or + * nobody has focus). The reason is, HTML editor may handle some input + * even if there is no active editing host. + * Note that this does not return editor in descendant documents. + */ + static mozilla::EditorBase* GetActiveEditor(nsPresContext* aPresContext); + static mozilla::EditorBase* GetActiveEditor(nsPIDOMWindowOuter* aWindow); + + /** + * Returns `TextEditor` which manages `aAnonymousContent` if there is. + * Note that this method returns `nullptr` if `TextEditor` for the + * `aAnonymousContent` hasn't been created yet. + */ + static mozilla::TextEditor* GetTextEditorFromAnonymousNodeWithoutCreation( + const nsIContent* aAnonymousContent); + + /** + * Returns whether a node has an editable ancestor. + * + * @param aNode The node to test. + */ + static bool IsNodeInEditableRegion(nsINode* aNode); + + /** + * Returns a LogModule that logs debugging info from RFP functions. + */ + static mozilla::LogModule* ResistFingerprintingLog(); + + /** + * Returns a LogModule that dump calls from content script are logged to. + * This can be enabled with the 'Dump' module, and is useful for synchronizing + * content JS to other logging modules. + */ + static mozilla::LogModule* DOMDumpLog(); + + /** + * Returns whether a given header is forbidden for an XHR or fetch + * request. + */ + static bool IsForbiddenRequestHeader(const nsACString& aHeader, + const nsACString& aValue); + + /** + * Returns whether a given header is forbidden for a system XHR + * request. + */ + static bool IsForbiddenSystemRequestHeader(const nsACString& aHeader); + + /** + * Checks whether the header overrides any http methods + */ + static bool IsOverrideMethodHeader(const nsACString& headerName); + /** + * Checks whether the header value contains any forbidden method + */ + static bool ContainsForbiddenMethod(const nsACString& headerValue); + /** + * Returns whether a given header has characters that aren't permitted + */ + static bool IsCorsUnsafeRequestHeaderValue(const nsACString& aHeaderValue); + + /** + * Returns whether a given Accept header value is allowed + * for a non-CORS XHR or fetch request. + */ + static bool IsAllowedNonCorsAccept(const nsACString& aHeaderValue); + + /** + * Returns whether a given Content-Type header value is allowed + * for a non-CORS XHR or fetch request. + */ + static bool IsAllowedNonCorsContentType(const nsACString& aHeaderValue); + + /** + * Returns whether a given Content-Language or accept-language header value is + * allowed for a non-CORS XHR or fetch request. + */ + static bool IsAllowedNonCorsLanguage(const nsACString& aHeaderValue); + + /** + * Returns whether a given header and value is a CORS-safelisted request + * header per https://fetch.spec.whatwg.org/#cors-safelisted-request-header + */ + static bool IsCORSSafelistedRequestHeader(const nsACString& aName, + const nsACString& aValue); + + /** + * Returns whether a given header is forbidden for an XHR or fetch + * response. + */ + static bool IsForbiddenResponseHeader(const nsACString& aHeader); + + /** + * Returns the inner window ID for the window associated with a request. + */ + static uint64_t GetInnerWindowID(nsIRequest* aRequest); + + /** + * Returns the inner window ID for the window associated with a load group. + */ + static uint64_t GetInnerWindowID(nsILoadGroup* aLoadGroup); + + /** + * Encloses aHost in brackets if it is an IPv6 address. + */ + static void MaybeFixIPv6Host(nsACString& aHost); + + /** + * If the hostname for aURI is an IPv6 it encloses it in brackets, + * otherwise it just outputs the hostname in aHost. + */ + static nsresult GetHostOrIPv6WithBrackets(nsIURI* aURI, nsAString& aHost); + static nsresult GetHostOrIPv6WithBrackets(nsIURI* aURI, nsACString& aHost); + static nsresult GetHostOrIPv6WithBrackets(nsIPrincipal* aPrincipal, + nsACString& aHost); + + /* + * Call the given callback on all remote children of the given top-level + * window. Return Callstate::Stop from the callback to stop calling further + * children. + */ + static void CallOnAllRemoteChildren( + nsPIDOMWindowOuter* aWindow, + const std::function<mozilla::CallState(mozilla::dom::BrowserParent*)>& + aCallback); + + /** + * Given an IPCDataTransferImageContainer construct an imgIContainer for the + * image encoded by the transfer item. + */ + static nsresult DeserializeDataTransferImageContainer( + const mozilla::dom::IPCDataTransferImageContainer& aData, + imgIContainer** aContainer); + + /** + * Given a flavor obtained from an IPCDataTransferItem or nsITransferable, + * returns true if we should treat the data as an image. + */ + static bool IsFlavorImage(const nsACString& aFlavor); + + static bool IPCDataTransferItemHasKnownFlavor( + const mozilla::dom::IPCDataTransferItem& aItem); + + static nsresult IPCTransferableToTransferable( + const mozilla::dom::IPCDataTransfer& aDataTransfer, bool aAddDataFlavor, + nsITransferable* aTransferable, const bool aFilterUnknownFlavors); + + static nsresult IPCTransferableToTransferable( + const mozilla::dom::IPCDataTransfer& aDataTransfer, + const bool& aIsPrivateData, nsIPrincipal* aRequestingPrincipal, + const nsContentPolicyType& aContentPolicyType, bool aAddDataFlavor, + nsITransferable* aTransferable, const bool aFilterUnknownFlavors); + + static nsresult IPCTransferableItemToVariant( + const mozilla::dom::IPCDataTransferItem& aDataTransferItem, + nsIWritableVariant* aVariant); + + static void TransferablesToIPCTransferables( + nsIArray* aTransferables, nsTArray<mozilla::dom::IPCDataTransfer>& aIPC, + bool aInSyncMessage, mozilla::dom::ContentChild* aChild, + mozilla::dom::ContentParent* aParent); + + static void TransferableToIPCTransferable( + nsITransferable* aTransferable, + mozilla::dom::IPCDataTransfer* aIPCDataTransfer, bool aInSyncMessage, + mozilla::dom::ContentChild* aChild, mozilla::dom::ContentParent* aParent); + + /* + * Get the pixel data from the given source surface and return it as a + * BigBuffer. The length and stride will be assigned from the surface. + */ + static mozilla::Maybe<mozilla::ipc::BigBuffer> GetSurfaceData( + mozilla::gfx::DataSourceSurface&, size_t* aLength, int32_t* aStride); + + static mozilla::Maybe<mozilla::dom::IPCImage> SurfaceToIPCImage( + mozilla::gfx::DataSourceSurface&); + static already_AddRefed<mozilla::gfx::DataSourceSurface> IPCImageToSurface( + mozilla::dom::IPCImage&&); + + // Helpers shared by the implementations of nsContentUtils methods and + // nsIDOMWindowUtils methods. + static mozilla::Modifiers GetWidgetModifiers(int32_t aModifiers); + static nsIWidget* GetWidget(mozilla::PresShell* aPresShell, nsPoint* aOffset); + static int16_t GetButtonsFlagForButton(int32_t aButton); + static mozilla::LayoutDeviceIntPoint ToWidgetPoint( + const mozilla::CSSPoint& aPoint, const nsPoint& aOffset, + nsPresContext* aPresContext); + static nsView* GetViewToDispatchEvent(nsPresContext* aPresContext, + mozilla::PresShell** aPresShell); + + /** + * Synthesize a mouse event to the given widget + * (see nsIDOMWindowUtils.sendMouseEvent). + */ + MOZ_CAN_RUN_SCRIPT + static nsresult 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, + mozilla::PreventDefaultResult* aPreventDefault, + bool aIsDOMEventSynthesized, bool aIsWidgetEventSynthesized); + + static void FirePageShowEventForFrameLoaderSwap( + nsIDocShellTreeItem* aItem, + mozilla::dom::EventTarget* aChromeEventHandler, bool aFireIfShowing, + bool aOnlySystemGroup = false); + + static void FirePageHideEventForFrameLoaderSwap( + nsIDocShellTreeItem* aItem, + mozilla::dom::EventTarget* aChromeEventHandler, + bool aOnlySystemGroup = false); + + static already_AddRefed<nsPIWindowRoot> GetWindowRoot(Document* aDoc); + + /* + * If there is a Referrer-Policy response header in |aChannel|, parse a + * referrer policy from the header. + * + * @param the channel from which to get the Referrer-Policy header + * @return referrer policy from the response header in aChannel + */ + static mozilla::dom::ReferrerPolicy GetReferrerPolicyFromChannel( + nsIChannel* aChannel); + + static bool IsNonSubresourceRequest(nsIChannel* aChannel); + + static bool IsNonSubresourceInternalPolicyType(nsContentPolicyType aType); + + public: + /* + * Returns true if this window's channel has been marked as a third-party + * tracking resource. + */ + static bool IsThirdPartyTrackingResourceWindow(nsPIDOMWindowInner* aWindow); + + /* + * Returns true if this window's channel has been marked as a first-party + * tracking resource. + */ + static bool IsFirstPartyTrackingResourceWindow(nsPIDOMWindowInner* aWindow); + + /* + * Serializes a HTML nsINode into its markup representation. + */ + static bool SerializeNodeToMarkup(nsINode* aRoot, bool aDescendentsOnly, + nsAString& aOut); + + /* + * Returns true iff the provided JSObject is a global, and its URI matches + * the provided about: URI. + * @param aGlobal the JSObject whose URI to check, if it is a global. + * @param aUri the URI to match, e.g. "about:feeds" + */ + static bool IsSpecificAboutPage(JSObject* aGlobal, const char* aUri); + + static void SetScrollbarsVisibility(nsIDocShell* aDocShell, bool aVisible); + + /* + * Try to find the docshell corresponding to the given event target. + */ + static nsIDocShell* GetDocShellForEventTarget( + mozilla::dom::EventTarget* aTarget); + + /** + * Returns true if the "HTTPS state" of the document should be "modern". See: + * + * https://html.spec.whatwg.org/#concept-document-https-state + * https://fetch.spec.whatwg.org/#concept-response-https-state + */ + static bool HttpsStateIsModern(Document* aDocument); + + /** + * Returns true if the channel is for top-level window and is over secure + * context. + * https://github.com/whatwg/html/issues/4930 tracks the spec side of this. + */ + static bool ComputeIsSecureContext(nsIChannel* aChannel); + + /** + * Try to upgrade an element. + * https://html.spec.whatwg.org/multipage/custom-elements.html#concept-try-upgrade + */ + static void TryToUpgradeElement(Element* aElement); + + /** + * Creates a new XUL or XHTML element applying any appropriate custom element + * definition. + * + * If aFromParser != FROM_PARSER_FRAGMENT, a nested event loop permits + * arbitrary changes to the world before this function returns. This should + * probably just be MOZ_CAN_RUN_SCRIPT - bug 1543259. + */ + MOZ_CAN_RUN_SCRIPT_BOUNDARY static nsresult NewXULOrHTMLElement( + Element** aResult, mozilla::dom::NodeInfo* aNodeInfo, + mozilla::dom::FromParser aFromParser, nsAtom* aIsAtom, + mozilla::dom::CustomElementDefinition* aDefinition); + + static mozilla::dom::CustomElementRegistry* GetCustomElementRegistry( + Document*); + + /** + * Looking up a custom element definition. + * https://html.spec.whatwg.org/#look-up-a-custom-element-definition + */ + static mozilla::dom::CustomElementDefinition* LookupCustomElementDefinition( + Document* aDoc, nsAtom* aNameAtom, uint32_t aNameSpaceID, + nsAtom* aTypeAtom); + + static void RegisterCallbackUpgradeElement(Element* aElement, + nsAtom* aTypeName); + + static void RegisterUnresolvedElement(Element* aElement, nsAtom* aTypeName); + static void UnregisterUnresolvedElement(Element* aElement); + + static void EnqueueUpgradeReaction( + Element* aElement, mozilla::dom::CustomElementDefinition* aDefinition); + + static void EnqueueLifecycleCallback( + mozilla::dom::ElementCallbackType aType, Element* aCustomElement, + const mozilla::dom::LifecycleCallbackArgs& aArgs, + mozilla::dom::CustomElementDefinition* aDefinition = nullptr); + + /** + * Appends all "document level" native anonymous content subtree roots for + * aDocument to aElements. Document level NAC subtrees are those created + * by ancestor frames of the document element's primary frame, such as + * the scrollbar elements created by the root scroll frame. + */ + static void AppendDocumentLevelNativeAnonymousContentTo( + Document* aDocument, nsTArray<nsIContent*>& aElements); + + /** + * Appends all native anonymous content subtree roots generated by `aContent` + * to `aKids`. + * + * See `AllChildrenIterator` for the description of the `aFlags` parameter. + */ + static void AppendNativeAnonymousChildren(const nsIContent* aContent, + nsTArray<nsIContent*>& aKids, + uint32_t aFlags); + + /** + * Query triggeringPrincipal if there's a 'triggeringprincipal' attribute on + * aLoadingNode, if no such attribute is specified, aDefaultPrincipal is + * returned if it is provided, otherwise the NodePrincipal of aLoadingNode is + * returned. + * + * Return true if aLoadingNode has a 'triggeringprincipal' attribute, and + * the value 'triggeringprincipal' is also successfully deserialized, + * otherwise return false. + */ + static bool QueryTriggeringPrincipal(nsIContent* aLoadingNode, + nsIPrincipal* aDefaultPrincipal, + nsIPrincipal** aTriggeringPrincipal); + + static bool QueryTriggeringPrincipal(nsIContent* aLoadingNode, + nsIPrincipal** aTriggeringPrincipal) { + return QueryTriggeringPrincipal(aLoadingNode, nullptr, + aTriggeringPrincipal); + } + + // Returns whether the image for the given URI and triggering principal is + // already available. Ideally this should exactly match the "list of available + // images" in the HTML spec, but our implementation of that at best only + // resembles it. + static bool IsImageAvailable(nsIContent*, nsIURI*, + nsIPrincipal* aDefaultTriggeringPrincipal, + mozilla::CORSMode); + + /** + * Returns the content policy type that should be used for loading images + * for displaying in the UI. The sources of such images can be <xul:image>, + * <xul:menuitem> on OSX where we load the image through nsMenuItemIconX, etc. + */ + static void GetContentPolicyTypeForUIImageLoading( + nsIContent* aLoadingNode, nsIPrincipal** aTriggeringPrincipal, + nsContentPolicyType& aContentPolicyType, uint64_t* aRequestContextID); + + static nsresult CreateJSValueFromSequenceOfObject( + JSContext* aCx, const mozilla::dom::Sequence<JSObject*>& aTransfer, + JS::MutableHandle<JS::Value> aValue); + + /** + * This implements the structured cloning algorithm as described by + * https://html.spec.whatwg.org/#structured-cloning. + */ + static void StructuredClone( + JSContext* aCx, nsIGlobalObject* aGlobal, JS::Handle<JS::Value> aValue, + const mozilla::dom::StructuredSerializeOptions& aOptions, + JS::MutableHandle<JS::Value> aRetval, mozilla::ErrorResult& aError); + + /** + * Returns true if reserved key events should be prevented from being sent + * to their target. Instead, the key event should be handled by chrome only. + */ + static bool ShouldBlockReservedKeys(mozilla::WidgetKeyboardEvent* aKeyEvent); + + /** + * Returns the nsIPluginTag for the plugin we should try to use for a given + * MIME type. + * + * @param aMIMEType The MIME type of the document being loaded. + * @param aNoFakePlugin If false then this method should consider JS plugins. + */ + static already_AddRefed<nsIPluginTag> PluginTagForType( + const nsCString& aMIMEType, bool aNoFakePlugin); + + /** + * Returns one of the nsIObjectLoadingContent::TYPE_ values describing the + * content type which will be used for the given MIME type when loaded within + * an nsObjectLoadingContent. + * + * NOTE: This method doesn't take capabilities into account. The caller must + * take that into account. + * + * @param aMIMEType The MIME type of the document being loaded. + * @param aNoFakePlugin If false then this method should consider JS plugins. + */ + static uint32_t HtmlObjectContentTypeForMIMEType(const nsCString& aMIMEType, + bool aNoFakePlugin); + + static already_AddRefed<nsISerialEventTarget> GetEventTargetByLoadInfo( + nsILoadInfo* aLoadInfo, mozilla::TaskCategory aCategory); + + /** + * Detect whether a string is a local-url. + * https://drafts.csswg.org/css-values/#local-urls + */ + static bool IsLocalRefURL(const nsAString& aString); + + /** + * Compose a tab id with process id and a serial number. + */ + static uint64_t GenerateTabId(); + + /** + * Compose a browser id with process id and a serial number. + */ + static uint64_t GenerateBrowserId(); + + /** + * Generate an id for a BrowsingContext using a range of serial + * numbers reserved for the current process. + */ + static uint64_t GenerateBrowsingContextId(); + + /** + * Generate an id using a range of serial numbers reserved for the current + * process. aId should be a counter that's incremented every time + * GenerateProcessSpecificId is called. + */ + static uint64_t GenerateProcessSpecificId(uint64_t aId); + + static std::tuple<uint64_t, uint64_t> SplitProcessSpecificId(uint64_t aId); + + /** + * Generate a window ID which is unique across processes and will never be + * recycled. + */ + static uint64_t GenerateWindowId(); + + /** + * Generate an ID for a load which is unique across processes and will never + * be recycled. + */ + static uint64_t GenerateLoadIdentifier(); + + /** + * Determine whether or not the user is currently interacting with the web + * browser. This method is safe to call from off of the main thread. + */ + static bool GetUserIsInteracting(); + + // Alternate data MIME type used by the ScriptLoader to register and read + // bytecode out of the nsCacheInfoChannel. + [[nodiscard]] static bool InitJSBytecodeMimeType(); + static nsCString& JSScriptBytecodeMimeType() { + MOZ_ASSERT(sJSScriptBytecodeMimeType); + return *sJSScriptBytecodeMimeType; + } + static nsCString& JSModuleBytecodeMimeType() { + MOZ_ASSERT(sJSModuleBytecodeMimeType); + return *sJSModuleBytecodeMimeType; + } + + /** + * Checks if the passed-in name is one of the special names: "_blank", "_top", + * "_parent" or "_self". + */ + static bool IsSpecialName(const nsAString& aName); + + /** + * Checks if the passed-in name should override an existing name on the + * window. Values which should not override include: "", "_blank", "_top", + * "_parent" and "_self". + */ + static bool IsOverridingWindowName(const nsAString& aName); + + /** + * If there is a SourceMap (higher precedence) or X-SourceMap (lower + * precedence) response header in |aChannel|, set |aResult| to the + * header's value and return true. Otherwise, return false. + * + * @param aChannel The HTTP channel + * @param aResult The string result. + */ + static bool GetSourceMapURL(nsIHttpChannel* aChannel, nsACString& aResult); + + /** + * Returns true if the passed-in mesasge is a pending InputEvent. + * + * @param aMsg The message to check + */ + static bool IsMessageInputEvent(const IPC::Message& aMsg); + + /** + * Returns true if the passed-in message is a critical InputEvent. + * + * @param aMsg The message to check + */ + static bool IsMessageCriticalInputEvent(const IPC::Message& aMsg); + + static void AsyncPrecreateStringBundles(); + + static bool ContentIsLink(nsIContent* aContent); + + static already_AddRefed<mozilla::dom::ContentFrameMessageManager> + TryGetBrowserChildGlobal(nsISupports* aFrom); + + // Get a serial number for a newly created inner or outer window. + static uint32_t InnerOrOuterWindowCreated(); + // Record that an inner or outer window has been destroyed. + static void InnerOrOuterWindowDestroyed(); + // Get the current number of inner or outer windows. + static int32_t GetCurrentInnerOrOuterWindowCount() { + return sInnerOrOuterWindowCount; + } + + // Return an anonymized URI so that it can be safely exposed publicly. + static nsresult AnonymizeURI(nsIURI* aURI, nsCString& aAnonymizedURI); + + /** + * Serializes a JSON-like JS::Value into a string. + * + * Usage: + * nsAutoString serializedValue; + * nsContentUtils::StringifyJSON(cx, &value, serializedValue); + */ + static bool StringifyJSON(JSContext* aCx, JS::MutableHandle<JS::Value> vp, + nsAString& aOutStr); + + /** + * Returns true if the top level ancestor content document of aDocument hasn't + * yet had the first contentful paint and there is a high priority event + * pending in the main thread. + */ + static bool HighPriorityEventPendingForTopLevelDocumentBeforeContentfulPaint( + Document* aDocument); + + /** + * Get the inner window corresponding to the incumbent global, including + * mapping extension content script globals to the attached window. + * + * Returns null if the incumbent global doesn't correspond to an inner window. + */ + static nsGlobalWindowInner* IncumbentInnerWindow(); + + /** + * Get the inner window corresponding to the entry global, including mapping + * extension content script globals to the attached window. + * + * Returns null if the entry global doesn't correspond to an inner window. + */ + static nsGlobalWindowInner* EntryInnerWindow(); + + /* + * Return safe area insets of window that defines as + * https://drafts.csswg.org/css-env-1/#safe-area-insets. + */ + static mozilla::ScreenIntMargin GetWindowSafeAreaInsets( + nsIScreen* aScreen, const mozilla::ScreenIntMargin& aSafeareaInsets, + const mozilla::LayoutDeviceIntRect& aWindowRect); + + struct SubresourceCacheValidationInfo { + // The expiration time, in seconds, if known. + mozilla::Maybe<uint32_t> mExpirationTime; + bool mMustRevalidate = false; + }; + + /** + * Gets cache validation info for subresources such as images or CSS + * stylesheets. + */ + static SubresourceCacheValidationInfo GetSubresourceCacheValidationInfo( + nsIRequest*, nsIURI*); + + static uint32_t SecondsFromPRTime(PRTime aTime) { + return uint32_t(int64_t(aTime) / int64_t(PR_USEC_PER_SEC)); + } + + /** + * Converts the given URL to a string and truncates it to the given length. + * + * Returns an empty string if aURL is null. + */ + static nsCString TruncatedURLForDisplay(nsIURI* aURL, size_t aMaxLen = 128); + + /** + * Anonymize the given id by hashing it with the provided origin. The + * resulting id will have the same length as the one that was passed in. + */ + enum class OriginFormat { + Base64, + Plain, + }; + + static nsresult AnonymizeId(nsAString& aId, const nsACString& aOriginKey, + OriginFormat aFormat = OriginFormat::Base64); + + /** + * Return true if we should hide the synthetic browsing context for <object> + * or <embed> images in synthetic documents. + */ + static bool ShouldHideObjectOrEmbedImageDocument(); + + /** + * Returns the object type that the object loading content will actually use + * to load the resource. Used for ORB and loading images into synthetic + * documents. + */ + static uint32_t ResolveObjectType(uint32_t aType); + + /** + * Create and load the string bundle for the 'aFile'. + * This API is used to preload the string bundle on the main thread so later + * other thread could access it. + */ + static nsresult EnsureAndLoadStringBundle(PropertiesFile aFile); + + /** + * The method asks nsIAppShell to prioritize Gecko's internal tasks over + * the OS level tasks for a short period of time. + */ + static void RequestGeckoTaskBurst(); + + private: + static bool InitializeEventTable(); + + static nsresult EnsureStringBundle(PropertiesFile aFile); + + static bool CanCallerAccess(nsIPrincipal* aSubjectPrincipal, + nsIPrincipal* aPrincipal); + + static nsresult WrapNative(JSContext* cx, nsISupports* native, + nsWrapperCache* cache, const nsIID* aIID, + JS::MutableHandle<JS::Value> vp, + bool aAllowWrapping); + + // TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230) + MOZ_CAN_RUN_SCRIPT_BOUNDARY static nsresult DispatchEvent( + Document* aDoc, nsISupports* aTarget, const nsAString& aEventName, + CanBubble, Cancelable, Composed, Trusted, bool* aDefaultAction = nullptr, + ChromeOnlyDispatch = ChromeOnlyDispatch::eNo); + + // TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230) + MOZ_CAN_RUN_SCRIPT_BOUNDARY static nsresult DispatchEvent( + Document* aDoc, nsISupports* aTarget, mozilla::WidgetEvent& aWidgetEvent, + EventMessage aEventMessage, CanBubble, Cancelable, Trusted, + bool* aDefaultAction = nullptr, + ChromeOnlyDispatch = ChromeOnlyDispatch::eNo); + + static void InitializeModifierStrings(); + + static void DropFragmentParsers(); + + static bool MatchClassNames(mozilla::dom::Element* aElement, + int32_t aNamespaceID, nsAtom* aAtom, void* aData); + static void DestroyClassNameArray(void* aData); + static void* AllocClassMatchingInfo(nsINode* aRootNode, + const nsString* aClasses); + + static mozilla::EventClassID GetEventClassIDFromMessage( + EventMessage aEventMessage); + + // Fills in aInfo with the tokens from the supplied autocomplete attribute. + static AutocompleteAttrState InternalSerializeAutocompleteAttribute( + const nsAttrValue* aAttrVal, mozilla::dom::AutocompleteInfo& aInfo, + bool aGrantAllValidValue = false); + + static mozilla::CallState CallOnAllRemoteChildren( + mozilla::dom::MessageBroadcaster* aManager, + const std::function<mozilla::CallState(mozilla::dom::BrowserParent*)>& + aCallback); + + static nsINode* GetCommonAncestorHelper(nsINode* aNode1, nsINode* aNode2); + static nsIContent* GetCommonFlattenedTreeAncestorHelper( + nsIContent* aContent1, nsIContent* aContent2); + + static nsIXPConnect* sXPConnect; + + static nsIScriptSecurityManager* sSecurityManager; + static nsIPrincipal* sSystemPrincipal; + static nsIPrincipal* sNullSubjectPrincipal; + + static nsIIOService* sIOService; + + static nsIConsoleService* sConsoleService; + + static nsTHashMap<nsRefPtrHashKey<nsAtom>, EventNameMapping>* sAtomEventTable; + static nsTHashMap<nsStringHashKey, EventNameMapping>* sStringEventTable; + static nsTArray<RefPtr<nsAtom>>* sUserDefinedEvents; + + static nsIStringBundleService* sStringBundleService; + class nsContentUtilsReporter; + + static nsIContentPolicy* sContentPolicyService; + static bool sTriedToGetContentPolicy; + + static mozilla::StaticRefPtr<nsIBidiKeyboard> sBidiKeyboard; + + static bool sInitialized; + static uint32_t sScriptBlockerCount; + static uint32_t sDOMNodeRemovedSuppressCount; + + // Not an nsCOMArray because removing elements from those is slower + static AutoTArray<nsCOMPtr<nsIRunnable>, 8>* sBlockedScriptRunners; + static uint32_t sRunnersCountAtFirstBlocker; + static uint32_t sScriptBlockerCountWhereRunnersPrevented; + + static nsIInterfaceRequestor* sSameOriginChecker; + + static bool sIsHandlingKeyBoardEvent; +#ifndef RELEASE_OR_BETA + static bool sBypassCSSOMOriginCheck; +#endif + + class UserInteractionObserver; + static UserInteractionObserver* sUserInteractionObserver; + + static nsHtml5StringParser* sHTMLFragmentParser; + static nsParser* sXMLFragmentParser; + static nsIFragmentContentSink* sXMLFragmentSink; + + /** + * True if there's a fragment parser activation on the stack. + */ + static bool sFragmentParsingActive; + + static nsString* sShiftText; + static nsString* sControlText; + static nsString* sMetaText; + static nsString* sOSText; + static nsString* sAltText; + static nsString* sModifierSeparator; + + // Alternate data mime types, used by the ScriptLoader to register and read + // the bytecode out of the nsCacheInfoChannel. + static nsCString* sJSScriptBytecodeMimeType; + static nsCString* sJSModuleBytecodeMimeType; + + static mozilla::LazyLogModule gResistFingerprintingLog; + static mozilla::LazyLogModule sDOMDumpLog; + + static int32_t sInnerOrOuterWindowCount; + static uint32_t sInnerOrOuterWindowSerialCounter; +}; + +/* static */ inline ExtContentPolicyType +nsContentUtils::InternalContentPolicyTypeToExternal(nsContentPolicyType aType) { + switch (aType) { + case nsIContentPolicy::TYPE_INTERNAL_SCRIPT: + case nsIContentPolicy::TYPE_INTERNAL_SCRIPT_PRELOAD: + case nsIContentPolicy::TYPE_INTERNAL_MODULE: + case nsIContentPolicy::TYPE_INTERNAL_MODULE_PRELOAD: + case nsIContentPolicy::TYPE_INTERNAL_WORKER: + case nsIContentPolicy::TYPE_INTERNAL_SHARED_WORKER: + case nsIContentPolicy::TYPE_INTERNAL_SERVICE_WORKER: + case nsIContentPolicy::TYPE_INTERNAL_WORKER_IMPORT_SCRIPTS: + case nsIContentPolicy::TYPE_INTERNAL_AUDIOWORKLET: + case nsIContentPolicy::TYPE_INTERNAL_PAINTWORKLET: + case nsIContentPolicy::TYPE_INTERNAL_CHROMEUTILS_COMPILED_SCRIPT: + case nsIContentPolicy::TYPE_INTERNAL_FRAME_MESSAGEMANAGER_SCRIPT: + return ExtContentPolicy::TYPE_SCRIPT; + + case nsIContentPolicy::TYPE_INTERNAL_EMBED: + case nsIContentPolicy::TYPE_INTERNAL_OBJECT: + return ExtContentPolicy::TYPE_OBJECT; + + case nsIContentPolicy::TYPE_INTERNAL_FRAME: + case nsIContentPolicy::TYPE_INTERNAL_IFRAME: + return ExtContentPolicy::TYPE_SUBDOCUMENT; + + case nsIContentPolicy::TYPE_INTERNAL_AUDIO: + case nsIContentPolicy::TYPE_INTERNAL_VIDEO: + case nsIContentPolicy::TYPE_INTERNAL_TRACK: + return ExtContentPolicy::TYPE_MEDIA; + + case nsIContentPolicy::TYPE_INTERNAL_XMLHTTPREQUEST: + case nsIContentPolicy::TYPE_INTERNAL_EVENTSOURCE: + return ExtContentPolicy::TYPE_XMLHTTPREQUEST; + + case nsIContentPolicy::TYPE_INTERNAL_IMAGE: + case nsIContentPolicy::TYPE_INTERNAL_IMAGE_PRELOAD: + case nsIContentPolicy::TYPE_INTERNAL_IMAGE_FAVICON: + return ExtContentPolicy::TYPE_IMAGE; + + case nsIContentPolicy::TYPE_INTERNAL_STYLESHEET: + case nsIContentPolicy::TYPE_INTERNAL_STYLESHEET_PRELOAD: + return ExtContentPolicy::TYPE_STYLESHEET; + + case nsIContentPolicy::TYPE_INTERNAL_DTD: + case nsIContentPolicy::TYPE_INTERNAL_FORCE_ALLOWED_DTD: + return ExtContentPolicy::TYPE_DTD; + + case nsIContentPolicy::TYPE_INTERNAL_FONT_PRELOAD: + return ExtContentPolicy::TYPE_FONT; + + case nsIContentPolicy::TYPE_INTERNAL_FETCH_PRELOAD: + return ExtContentPolicy::TYPE_FETCH; + + default: + return static_cast<ExtContentPolicyType>(aType); + } +} + +namespace mozilla { +std::ostream& operator<<( + std::ostream& aOut, + const mozilla::PreventDefaultResult aPreventDefaultResult); +} // namespace mozilla + +class MOZ_RAII nsAutoScriptBlocker { + public: + explicit nsAutoScriptBlocker() { nsContentUtils::AddScriptBlocker(); } + ~nsAutoScriptBlocker() { nsContentUtils::RemoveScriptBlocker(); } + + private: +}; + +class MOZ_STACK_CLASS nsAutoScriptBlockerSuppressNodeRemoved + : public nsAutoScriptBlocker { + public: + nsAutoScriptBlockerSuppressNodeRemoved() { + ++nsContentUtils::sDOMNodeRemovedSuppressCount; + } + ~nsAutoScriptBlockerSuppressNodeRemoved() { + --nsContentUtils::sDOMNodeRemovedSuppressCount; + } +}; + +namespace mozilla::dom { + +class TreeOrderComparator { + public: + bool Equals(nsINode* aElem1, nsINode* aElem2) const { + return aElem1 == aElem2; + } + bool LessThan(nsINode* aElem1, nsINode* aElem2) const { + return nsContentUtils::PositionIsBefore(aElem1, aElem2); + } +}; + +} // namespace mozilla::dom + +#define NS_INTERFACE_MAP_ENTRY_TEAROFF(_interface, _allocator) \ + if (aIID.Equals(NS_GET_IID(_interface))) { \ + foundInterface = static_cast<_interface*>(_allocator); \ + if (!foundInterface) { \ + *aInstancePtr = nullptr; \ + return NS_ERROR_OUT_OF_MEMORY; \ + } \ + } else + +/* + * In the following helper macros we exploit the fact that the result of a + * series of additions will not be finite if any one of the operands in the + * series is not finite. + */ +#define NS_ENSURE_FINITE(f, rv) \ + if (!mozilla::IsFinite(f)) { \ + return (rv); \ + } + +#define NS_ENSURE_FINITE2(f1, f2, rv) \ + if (!mozilla::IsFinite((f1) + (f2))) { \ + return (rv); \ + } + +#define NS_ENSURE_FINITE4(f1, f2, f3, f4, rv) \ + if (!mozilla::IsFinite((f1) + (f2) + (f3) + (f4))) { \ + return (rv); \ + } + +#define NS_ENSURE_FINITE5(f1, f2, f3, f4, f5, rv) \ + if (!mozilla::IsFinite((f1) + (f2) + (f3) + (f4) + (f5))) { \ + return (rv); \ + } + +#define NS_ENSURE_FINITE6(f1, f2, f3, f4, f5, f6, rv) \ + if (!mozilla::IsFinite((f1) + (f2) + (f3) + (f4) + (f5) + (f6))) { \ + return (rv); \ + } + +// Deletes a linked list iteratively to avoid blowing up the stack (bug 460444). +#define NS_CONTENT_DELETE_LIST_MEMBER(type_, ptr_, member_) \ + { \ + type_* cur = (ptr_)->member_; \ + (ptr_)->member_ = nullptr; \ + while (cur) { \ + type_* next = cur->member_; \ + cur->member_ = nullptr; \ + delete cur; \ + cur = next; \ + } \ + } + +#endif /* nsContentUtils_h___ */ |