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Diffstat (limited to 'dom/base/nsObjectLoadingContent.h')
| -rw-r--r-- | dom/base/nsObjectLoadingContent.h | 469 |
1 files changed, 469 insertions, 0 deletions
diff --git a/dom/base/nsObjectLoadingContent.h b/dom/base/nsObjectLoadingContent.h new file mode 100644 index 0000000000..563ad4df3f --- /dev/null +++ b/dom/base/nsObjectLoadingContent.h @@ -0,0 +1,469 @@ +/* -*- 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 base class implementing nsIObjectLoadingContent for use by + * various content nodes that want to provide plugin/document/image + * loading functionality (eg <embed>, <object>, etc). + */ + +#ifndef NSOBJECTLOADINGCONTENT_H_ +#define NSOBJECTLOADINGCONTENT_H_ + +#include "mozilla/Maybe.h" +#include "mozilla/dom/BindingDeclarations.h" +#include "nsIFrame.h" // for WeakFrame only +#include "nsIStreamListener.h" +#include "nsIChannelEventSink.h" +#include "nsIObjectLoadingContent.h" +#include "nsFrameLoaderOwner.h" + +class nsStopPluginRunnable; +class nsIPrincipal; +class nsFrameLoader; + +namespace mozilla::dom { +struct BindContext; +template <typename T> +class Sequence; +class HTMLIFrameElement; +template <typename T> +struct Nullable; +class WindowProxyHolder; +class XULFrameElement; +} // namespace mozilla::dom + +class nsObjectLoadingContent : public nsIStreamListener, + public nsFrameLoaderOwner, + public nsIObjectLoadingContent, + public nsIChannelEventSink { + friend class AutoSetLoadingToFalse; + + public: + // This enum's values must be the same as the constants on + // nsIObjectLoadingContent + enum class ObjectType : uint8_t { + // Loading, type not yet known. We may be waiting for a channel to open. + Loading = TYPE_LOADING, + // Content is a subdocument, possibly SVG + Document = TYPE_DOCUMENT, + // Content is unknown and should be represented by an empty element. + Fallback = TYPE_FALLBACK + }; + + nsObjectLoadingContent(); + virtual ~nsObjectLoadingContent(); + + NS_DECL_NSIREQUESTOBSERVER + NS_DECL_NSISTREAMLISTENER + NS_DECL_NSIOBJECTLOADINGCONTENT + NS_DECL_NSICHANNELEVENTSINK + + ObjectType Type() const { return mType; } + + void SetIsNetworkCreated(bool aNetworkCreated) { + mNetworkCreated = aNetworkCreated; + } + + static bool IsSuccessfulRequest(nsIRequest*, nsresult* aStatus); + + // WebIDL API + mozilla::dom::Document* GetContentDocument(nsIPrincipal& aSubjectPrincipal); + void GetActualType(nsAString& aType) const { + CopyUTF8toUTF16(mContentType, aType); + } + uint32_t DisplayedType() const { return uint32_t(mType); } + nsIURI* GetSrcURI() const { return mURI; } + + void SwapFrameLoaders(mozilla::dom::HTMLIFrameElement& aOtherLoaderOwner, + mozilla::ErrorResult& aRv) { + aRv.Throw(NS_ERROR_NOT_IMPLEMENTED); + } + void SwapFrameLoaders(mozilla::dom::XULFrameElement& aOtherLoaderOwner, + mozilla::ErrorResult& aRv) { + aRv.Throw(NS_ERROR_NOT_IMPLEMENTED); + } + + bool IsRewrittenYoutubeEmbed() const { return mRewrittenYoutubeEmbed; } + + const mozilla::Maybe<mozilla::IntrinsicSize>& GetSubdocumentIntrinsicSize() + const { + return mSubdocumentIntrinsicSize; + } + + const mozilla::Maybe<mozilla::AspectRatio>& GetSubdocumentIntrinsicRatio() + const { + return mSubdocumentIntrinsicRatio; + } + + void SubdocumentIntrinsicSizeOrRatioChanged( + const mozilla::Maybe<mozilla::IntrinsicSize>& aIntrinsicSize, + const mozilla::Maybe<mozilla::AspectRatio>& aIntrinsicRatio); + + void SubdocumentImageLoadComplete(nsresult aResult); + + protected: + /** + * Begins loading the object when called + * + * Attributes of |this| QI'd to nsIContent will be inspected, depending on + * the node type. This function currently assumes it is a <object> or + * <embed> tag. + * + * The instantiated plugin depends on: + * - The URI (<embed src>, <object data>) + * - The type 'hint' (type attribute) + * - The mime type returned by opening the URI + * - Enabled plugins claiming the ultimate mime type + * - The capabilities returned by GetCapabilities + * - The classid attribute, if eFallbackIfClassIDPresent is among the + * capabilities + * + * If eAllowPluginSkipChannel is true, we may skip opening the URI if our + * type hint points to a valid plugin, deferring that responsibility to the + * plugin. + * Similarly, if no URI is provided, but a type hint for a valid plugin is + * present, that plugin will be instantiated + * + * Otherwise a request to that URI is made and the type sent by the server + * is used to find a suitable handler, EXCEPT when: + * - The type hint refers to a *supported* plugin, in which case that + * plugin will be instantiated regardless of the server provided type + * - The server returns a binary-stream type, and our type hint refers to + * a valid non-document type, we will use the type hint + * + * @param aNotify If we should send notifications. If false, content + * loading may be deferred while appropriate frames are + * created + * @param aForceLoad If we should reload this content (and re-attempt the + * channel open) even if our parameters did not change + */ + nsresult LoadObject(bool aNotify, bool aForceLoad = false); + + enum Capabilities { + eSupportImages = 1u << 0, // Images are supported (imgILoader) + eSupportDocuments = 1u << 1, // Documents are supported + // (DocumentLoaderFactory) + // This flag always includes SVG + + // Node supports class ID as an attribute, and should fallback if it is + // present, as class IDs are not supported. + eFallbackIfClassIDPresent = 1u << 2, + + // If possible to get a *plugin* type from the type attribute *or* file + // extension, we can use that type and begin loading the plugin before + // opening a channel. + // A side effect of this is if the channel fails, the plugin is still + // running. + eAllowPluginSkipChannel = 1u << 3 + }; + + /** + * Returns the list of capabilities this content node supports. This is a + * bitmask consisting of flags from the Capabilities enum. + * + * The default implementation supports all types but not + * eSupportClassID or eAllowPluginSkipChannel + */ + virtual uint32_t GetCapabilities() const; + + /** + * Destroys all loaded documents/plugins and releases references + */ + void Destroy(); + + // Subclasses should call cycle collection methods from the respective + // traverse / unlink. + static void Traverse(nsObjectLoadingContent* tmp, + nsCycleCollectionTraversalCallback& cb); + static void Unlink(nsObjectLoadingContent* tmp); + + void CreateStaticClone(nsObjectLoadingContent* aDest) const; + + void UnbindFromTree(bool aNullParent = true); + + /** + * Return the content policy type used for loading the element. + */ + virtual nsContentPolicyType GetContentPolicyType() const = 0; + + virtual const mozilla::dom::Element* AsElement() const = 0; + mozilla::dom::Element* AsElement() { + return const_cast<mozilla::dom::Element*>( + const_cast<const nsObjectLoadingContent*>(this)->AsElement()); + } + + /** + * Decides whether we should load <embed>/<object> node content. + * + * If this is an <embed> or <object> node there are cases in which we should + * not try to load the content: + * + * - If the node is the child of a media element + * - If the node is the child of an <object> node that already has + * content being loaded. + * + * In these cases, this function will return false, which will cause + * us to skip calling LoadObject. + */ + bool BlockEmbedOrObjectContentLoading(); + + private: + // Object parameter changes returned by UpdateObjectParameters + enum ParameterUpdateFlags { + eParamNoChange = 0, + // Parameters that potentially affect the channel changed + // - mOriginalURI, mOriginalContentType + eParamChannelChanged = 1u << 0, + // Parameters that affect displayed content changed + // - mURI, mContentType, mType, mBaseURI + eParamStateChanged = 1u << 1, + // The effective content type changed, independant of object type. This + // can happen when changing from Loading -> Final type, but doesn't + // necessarily happen when changing between object types. E.g., if a PDF + // handler was installed between the last load of this object and now, we + // might change from Document -> Plugin without changing + // ContentType + eParamContentTypeChanged = 1u << 2 + }; + + /** + * If we're an <object>, and show fallback, we might need to start nested + * <embed> or <object> loads that would otherwise be blocked by + * BlockEmbedOrObjectContentLoading(). + */ + void TriggerInnerFallbackLoads(); + + /** + * Internal version of LoadObject that should only be used by this class + * aLoadingChannel is passed by the LoadObject call from OnStartRequest, + * primarily for sanity-preservation + */ + nsresult LoadObject(bool aNotify, bool aForceLoad, + nsIRequest* aLoadingChannel); + + /** + * Inspects the object and sets the following member variables: + * - mOriginalContentType : This is the type attribute on the element + * - mOriginalURI : The src or data attribute on the element + * - mURI : The final URI, considering mChannel if + * mChannelLoaded is set + * - mContentType : The final content type, considering mChannel if + * mChannelLoaded is set + * - mBaseURI : The object's base URI, which may be set by the + * object + * - mType : The type the object is determined to be based + * on the above + * + * NOTE The class assumes that mType is the currently loaded type at various + * points, so the caller of this function must take the appropriate + * actions to ensure this + * + * NOTE This function does not perform security checks, only determining the + * requested type and parameters of the object. + * + * @return Returns a bitmask of ParameterUpdateFlags values + */ + ParameterUpdateFlags UpdateObjectParameters(); + + public: + bool IsAboutBlankLoadOntoInitialAboutBlank(nsIURI* aURI, + bool aInheritPrincipal, + nsIPrincipal* aPrincipalToInherit); + + private: + /** + * Opens the channel pointed to by mURI into mChannel. + */ + nsresult OpenChannel(); + + /** + * Closes and releases references to mChannel and, if opened, mFinalListener + */ + nsresult CloseChannel(); + + /** + * If this object should be tested against blocking list. + */ + bool ShouldBlockContent(); + + /** + * This method tells the final answer on whether this object's fallback + * content should be used instead of the original plugin content. + * + * @param aIsPluginClickToPlay Whether this object instance is CTP. + */ + bool PreferFallback(bool aIsPluginClickToPlay); + + /** + * Helper to check if our current URI passes policy + * + * @param aContentPolicy [out] The result of the content policy decision + * + * @return true if call succeeded and NS_CP_ACCEPTED(*aContentPolicy) + */ + bool CheckLoadPolicy(int16_t* aContentPolicy); + + /** + * Helper to check if the object passes process policy. Assumes we have a + * final determined type. + * + * @param aContentPolicy [out] The result of the content policy decision + * + * @return true if call succeeded and NS_CP_ACCEPTED(*aContentPolicy) + */ + bool CheckProcessPolicy(int16_t* aContentPolicy); + + void SetupFrameLoader(); + + /** + * Helper to spawn mFrameLoader and return a pointer to its docshell + * + * @param aURI URI we intend to load for the recursive load check (does not + * actually load anything) + */ + already_AddRefed<nsIDocShell> SetupDocShell(nsIURI* aRecursionCheckURI); + + /** + * Unloads all content and resets the object to a completely unloaded state + * + * NOTE Calls StopPluginInstance() and may spin the event loop + * + * @param aResetState Reset the object type to 'loading' and destroy channel + * as well + */ + void UnloadObject(bool aResetState = true); + + /** + * Notifies document observes about a new type/state of this object. + * Triggers frame construction as needed. mType must be set correctly when + * this method is called. This method is cheap if the type and state didn't + * actually change. + * + * @param aNotify if false, only need to update the state of our element. + */ + void NotifyStateChanged(ObjectType aOldType, bool aNotify); + + /** + * Returns a ObjectType value corresponding to the type of content we would + * support the given MIME type as, taking capabilities and plugin state + * into account + * + * @return The ObjectType enum value that we would attempt to load + * + * NOTE this does not consider whether the content would be suppressed by + * click-to-play or other content policy checks + */ + ObjectType GetTypeOfContent(const nsCString& aMIMEType); + + /** + * Used for identifying whether we can rewrite a youtube flash embed to + * possibly use HTML5 instead. + * + * Returns true if plugin.rewrite_youtube_embeds pref is true and the + * element this nsObjectLoadingContent instance represents: + * + * - is an embed or object node + * - has a URL pointing at the youtube.com domain, using "/v/" style video + * path reference. + * + * Having the enablejsapi flag means the document that contains the element + * could possibly be manipulating the youtube video elsewhere on the page + * via javascript. In the context of embed elements, this usage has been + * deprecated by youtube, so we can just rewrite as normal. + * + * If we can rewrite the URL, we change the "/v/" to "/embed/", and change + * our type to Document so that we render similarly to an iframe + * embed. + */ + void MaybeRewriteYoutubeEmbed(nsIURI* aURI, nsIURI* aBaseURI, + nsIURI** aRewrittenURI); + + // Utility for firing an error event, if we're an <object>. + void MaybeFireErrorEvent(); + + /** + * Store feature policy in container browsing context so that it can be + * accessed cross process. + */ + void MaybeStoreCrossOriginFeaturePolicy(); + + // The final listener for mChannel (uriloader, pluginstreamlistener, etc.) + nsCOMPtr<nsIStreamListener> mFinalListener; + + // The content type of our current load target, updated by + // UpdateObjectParameters(). Takes the channel's type into account once + // opened. + // + // May change if a channel is opened, does not imply a loaded state + nsCString mContentType; + + // The content type 'hint' provided by the element's type attribute. May + // or may not be used as a final type + nsCString mOriginalContentType; + + // The channel that's currently being loaded. If set, but mChannelLoaded is + // false, has not yet reached OnStartRequest + nsCOMPtr<nsIChannel> mChannel; + + // The URI of the current content. + // May change as we open channels and encounter redirects - does not imply + // a loaded type + nsCOMPtr<nsIURI> mURI; + + // The original URI obtained from inspecting the element. May differ from + // mURI due to redirects + nsCOMPtr<nsIURI> mOriginalURI; + + // The baseURI used for constructing mURI. + nsCOMPtr<nsIURI> mBaseURI; + + // Type of the currently-loaded content. + ObjectType mType; + + // If true, we have opened a channel as the listener and it has reached + // OnStartRequest. Does not get set for channels that are passed directly to + // the plugin listener. + bool mChannelLoaded : 1; + + // True when the object is created for an element which the parser has + // created using NS_FROM_PARSER_NETWORK flag. If the element is modified, + // it may lose the flag. + bool mNetworkCreated : 1; + + // Whether content blocking is enabled or not for this object. + bool mContentBlockingEnabled : 1; + + // Protects DoStopPlugin from reentry (bug 724781). + bool mIsStopping : 1; + + // Protects LoadObject from re-entry + bool mIsLoading : 1; + + // For plugin stand-in types (click-to-play) tracks whether content js has + // tried to access the plugin script object. + bool mScriptRequested : 1; + + // True if object represents an object/embed tag pointing to a flash embed + // for a youtube video. When possible (see IsRewritableYoutubeEmbed function + // comments for details), we change these to try to load HTML5 versions of + // videos. + bool mRewrittenYoutubeEmbed : 1; + + bool mLoadingSyntheticDocument : 1; + + // The intrinsic size and aspect ratio from a child SVG document that + // we should use. These are only set when we are an <object> or <embed> + // and the inner document is SVG. + // + // We store these here rather than on nsSubDocumentFrame since we are + // sometimes notified of our child's intrinsics before we've constructed + // our own frame. + mozilla::Maybe<mozilla::IntrinsicSize> mSubdocumentIntrinsicSize; + mozilla::Maybe<mozilla::AspectRatio> mSubdocumentIntrinsicRatio; +}; + +#endif |