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+/* -*- 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