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fune/dom/base/nsObjectLoadingContent.h

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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/Attributes.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "nsIFrame.h" // for WeakFrame only
#include "nsImageLoadingContent.h"
#include "nsIStreamListener.h"
#include "nsIChannelEventSink.h"
#include "nsIObjectLoadingContent.h"
#include "nsIRunnable.h"
#include "nsFrameLoaderOwner.h"
class nsAsyncInstantiateEvent;
class nsStopPluginRunnable;
class AutoSetInstantiatingToFalse;
class nsIPrincipal;
class nsFrameLoader;
class nsPluginFrame;
class nsPluginInstanceOwner;
namespace mozilla {
namespace dom {
struct BindContext;
template <typename T>
class Sequence;
struct MozPluginParameter;
class HTMLIFrameElement;
template <typename T>
struct Nullable;
class WindowProxyHolder;
class XULFrameElement;
} // namespace dom
} // namespace mozilla
class nsObjectLoadingContent : public nsImageLoadingContent,
public nsIStreamListener,
public nsFrameLoaderOwner,
public nsIObjectLoadingContent,
public nsIChannelEventSink {
friend class AutoSetInstantiatingToFalse;
friend class AutoSetLoadingToFalse;
friend class CheckPluginStopEvent;
friend class nsStopPluginRunnable;
friend class nsAsyncInstantiateEvent;
public:
// This enum's values must be the same as the constants on
// nsIObjectLoadingContent
enum ObjectType {
// Loading, type not yet known. We may be waiting for a channel to open.
eType_Loading = TYPE_LOADING,
// Content is a *non-svg* image
eType_Image = TYPE_IMAGE,
// Content is a plugin
eType_Plugin = TYPE_PLUGIN,
// Content is a fake plugin, which loads as a document but behaves as a
// plugin (see nsPluginHost::CreateFakePlugin)
eType_FakePlugin = TYPE_FAKE_PLUGIN,
// Content is a subdocument, possibly SVG
eType_Document = TYPE_DOCUMENT,
// No content loaded (fallback). May be showing alternate content or
// a custom error handler - *including* click-to-play dialogs
eType_Null = TYPE_NULL
};
enum FallbackType {
// The content type is not supported (e.g. plugin not installed)
eFallbackUnsupported = nsIObjectLoadingContent::PLUGIN_UNSUPPORTED,
// Showing alternate content
eFallbackAlternate = nsIObjectLoadingContent::PLUGIN_ALTERNATE,
// The plugin exists, but is disabled
eFallbackDisabled = nsIObjectLoadingContent::PLUGIN_DISABLED,
// The plugin is blocklisted and disabled
eFallbackBlocklisted = nsIObjectLoadingContent::PLUGIN_BLOCKLISTED,
// The plugin is considered outdated, but not disabled
eFallbackOutdated = nsIObjectLoadingContent::PLUGIN_OUTDATED,
// The plugin has crashed
eFallbackCrashed = nsIObjectLoadingContent::PLUGIN_CRASHED,
// Suppressed by security policy
eFallbackSuppressed = nsIObjectLoadingContent::PLUGIN_SUPPRESSED,
// Blocked by content policy
eFallbackUserDisabled = nsIObjectLoadingContent::PLUGIN_USER_DISABLED,
/// ** All values >= eFallbackClickToPlay are plugin placeholder types
/// that would be replaced by a real plugin if activated (PlayPlugin())
/// ** Furthermore, values >= eFallbackClickToPlay and
/// <= eFallbackClickToPlayQuiet are click-to-play types.
// The plugin is disabled until the user clicks on it
eFallbackClickToPlay = nsIObjectLoadingContent::PLUGIN_CLICK_TO_PLAY,
// The plugin is vulnerable (update available)
eFallbackVulnerableUpdatable =
nsIObjectLoadingContent::PLUGIN_VULNERABLE_UPDATABLE,
// The plugin is vulnerable (no update available)
eFallbackVulnerableNoUpdate =
nsIObjectLoadingContent::PLUGIN_VULNERABLE_NO_UPDATE,
// The plugin is click-to-play, but the user won't see overlays
eFallbackClickToPlayQuiet =
nsIObjectLoadingContent::PLUGIN_CLICK_TO_PLAY_QUIET,
};
nsObjectLoadingContent();
virtual ~nsObjectLoadingContent();
NS_DECL_NSIREQUESTOBSERVER
NS_DECL_NSISTREAMLISTENER
NS_DECL_NSIOBJECTLOADINGCONTENT
NS_DECL_NSICHANNELEVENTSINK
/**
* Object state. This is a bitmask of NS_EVENT_STATEs epresenting the
* current state of the object.
*/
mozilla::EventStates ObjectState() const;
ObjectType Type() const { return mType; }
void SetIsNetworkCreated(bool aNetworkCreated) {
mNetworkCreated = aNetworkCreated;
}
/**
* When the object is loaded, the attributes and all nested <param>
* elements are cached as name:value string pairs to be passed as
* parameters when instantiating the plugin.
*
* Note: these cached values can be overriden for different quirk cases.
*/
// Returns the cached attributes array.
void GetPluginAttributes(
nsTArray<mozilla::dom::MozPluginParameter>& aAttributes);
// Returns the cached <param> array.
void GetPluginParameters(
nsTArray<mozilla::dom::MozPluginParameter>& aParameters);
/**
* Immediately instantiate a plugin instance. This is a no-op if mType !=
* eType_Plugin or a plugin is already running.
*
* aIsLoading indicates that we are in the loading code, and we can bypass
* the mIsLoading check.
*/
nsresult InstantiatePluginInstance(bool aIsLoading = false);
/**
* Notify this class the document state has changed
* Called by Document so we may suspend plugins in inactive documents)
*/
void NotifyOwnerDocumentActivityChanged();
/**
* When a plug-in is instantiated, it can create a scriptable
* object that the page wants to interact with. We expose this
* object by placing it on the prototype chain of our element,
* between the element itself and its most-derived DOM prototype.
*
* SetupProtoChain handles actually inserting the plug-in
* scriptable object into the proto chain if needed.
*
* DoResolve is a hook that allows us to find out when the web
* page is looking up a property name on our object and make sure
* that our plug-in, if any, is instantiated.
*/
// Helper for WebIDL node wrapping
void SetupProtoChain(JSContext* aCx, JS::Handle<JSObject*> aObject);
// Remove plugin from protochain
void TeardownProtoChain();
// Helper for WebIDL NeedResolve
bool DoResolve(JSContext* aCx, JS::Handle<JSObject*> aObject,
JS::Handle<jsid> aId,
JS::MutableHandle<JS::PropertyDescriptor> aDesc);
// The return value is whether DoResolve might end up resolving the given
// id. If in doubt, return true.
static bool MayResolve(jsid aId);
// Helper for WebIDL enumeration
void GetOwnPropertyNames(JSContext* aCx,
JS::MutableHandleVector<jsid> /* unused */,
bool /* unused */, mozilla::ErrorResult& aRv);
// WebIDL API
mozilla::dom::Document* GetContentDocument(nsIPrincipal& aSubjectPrincipal);
void GetActualType(nsAString& aType) const {
CopyUTF8toUTF16(mContentType, aType);
}
uint32_t DisplayedType() const { return mType; }
uint32_t GetContentTypeForMIMEType(const nsAString& aMIMEType) {
return GetTypeOfContent(NS_ConvertUTF16toUTF8(aMIMEType), false);
}
void PlayPlugin(mozilla::dom::SystemCallerGuarantee,
mozilla::ErrorResult& aRv);
void Reload(bool aClearActivation, mozilla::ErrorResult& aRv) {
aRv = Reload(aClearActivation);
}
bool Activated() const { return mActivated; }
nsIURI* GetSrcURI() const { return mURI; }
/**
* The default state that this plugin would be without manual activation.
* @returns PLUGIN_ACTIVE if the default state would be active.
*/
uint32_t DefaultFallbackType();
uint32_t PluginFallbackType() const { return mFallbackType; }
bool HasRunningPlugin() const { return !!mInstanceOwner; }
// FIXME rename this
void SkipFakePlugins(mozilla::ErrorResult& aRv) { aRv = SkipFakePlugins(); }
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);
}
uint32_t GetRunID(mozilla::dom::SystemCallerGuarantee,
mozilla::ErrorResult& aRv);
bool IsRewrittenYoutubeEmbed() const { return mRewrittenYoutubeEmbed; }
void PresetOpenerWindow(const mozilla::dom::Nullable<
mozilla::dom::WindowProxyHolder>& aOpenerWindow,
mozilla::ErrorResult& aRv);
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)
eSupportPlugins = 1u << 1, // Plugins are supported (nsIPluginHost)
eSupportDocuments = 1u << 2, // 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 << 3,
// 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 << 4
};
/**
* 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 DestroyContent();
static void Traverse(nsObjectLoadingContent* tmp,
nsCycleCollectionTraversalCallback& cb);
void CreateStaticClone(nsObjectLoadingContent* aDest) const;
void DoStopPlugin(nsPluginInstanceOwner* aInstanceOwner);
nsresult BindToTree(mozilla::dom::BindContext&, nsINode& aParent);
void UnbindFromTree(bool aNullParent = true);
/**
* Return the content policy type used for loading the element.
*/
virtual nsContentPolicyType GetContentPolicyType() const = 0;
/**
* 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 eType_Document -> eType_Plugin without changing
// ContentType
eParamContentTypeChanged = 1u << 2
};
/**
* Getter for child <param> elements that are not nested in another plugin
* dom element.
* This is an internal helper function and should not be used directly for
* passing parameters to the plugin instance.
*
* See GetPluginParameters and GetPluginAttributes, which also handle
* quirk-overrides.
*
* @param aParameters The array containing pairs of name/value strings
* from nested <param> objects.
*/
void GetNestedParams(nsTArray<mozilla::dom::MozPluginParameter>& aParameters);
MOZ_MUST_USE nsresult BuildParametersArray();
/**
* Loads fallback content with the specified FallbackType
*
* @param aType FallbackType value for type of fallback we're loading
* @param aNotify Send notifications and events. If false, caller is
* responsible for doing so
*/
void LoadFallback(FallbackType aType, bool aNotify);
/**
* 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);
/**
* Introspects 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();
/**
* Queue a CheckPluginStopEvent and track it in mPendingCheckPluginStopEvent
*/
void QueueCheckPluginStopEvent();
void NotifyContentObjectWrapper();
/**
* 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();
/**
* If this object is allowed to play plugin content, or if it would display
* click-to-play instead.
* NOTE that this does not actually check if the object is a loadable plugin
* NOTE This ignores the current activated state. The caller should check
* this if appropriate.
*/
bool ShouldPlay(FallbackType& aReason);
/**
* This method tells if the fallback content should be attempted to be used
* over the original object content.
* It will look at prefs and this plugin's CTP state to make a decision.
*
* NOTE that this doesn't say whether the fallback _will_ be used, only
* whether we should look into it to possibly use it. The final answer will be
* given by the PreferFallback method.
*
* @param aIsPluginClickToPlay Whether this object instance is CTP.
*/
bool FavorFallbackMode(bool aIsPluginClickToPlay);
/**
* Whether the page has provided good fallback content to this object.
*/
bool HasGoodFallback();
/**
* 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);
/**
* Gets the plugin instance and creates a plugin stream listener, assigning
* it to mFinalListener
*/
bool MakePluginListener();
void SetupFrameLoader(int32_t aJSPluginId);
/**
* 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 aSync If a synchronous frame construction is required. If false,
* the construction may either be sync or async.
* @param aNotify if false, only need to update the state of our element.
*/
void NotifyStateChanged(ObjectType aOldType, mozilla::EventStates aOldState,
bool aSync, 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
*
* @param aNoFakePlugin Don't select a fake plugin handler as a valid type,
* as when SkipFakePlugins() is called.
* @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, bool aNoFakePlugin);
/**
* Gets the frame that's associated with this content node.
* Does not flush.
*/
nsPluginFrame* GetExistingFrame();
/**
* 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 eType_Document so that we render similarly to an iframe
* embed.
*/
void MaybeRewriteYoutubeEmbed(nsIURI* aURI, nsIURI* aBaseURI,
nsIURI** aRewrittenURI);
// Helper class for SetupProtoChain
class SetupProtoChainRunner final : public nsIRunnable {
~SetupProtoChainRunner() = default;
public:
NS_DECL_ISUPPORTS
explicit SetupProtoChainRunner(nsObjectLoadingContent* aContent);
NS_IMETHOD Run() override;
private:
// We store an nsIObjectLoadingContent because we can
// unambiguously refcount that.
RefPtr<nsIObjectLoadingContent> mContent;
};
// Utility getter for getting our nsNPAPIPluginInstance in a safe way.
nsNPAPIPluginInstance* ScriptRequestPluginInstance(JSContext* aCx);
// Utility method for getting our plugin JSObject
static nsresult GetPluginJSObject(JSContext* cx,
nsNPAPIPluginInstance* plugin_inst,
JS::MutableHandle<JSObject*> plugin_obj,
JS::MutableHandle<JSObject*> plugin_proto);
// Utility for firing an error event, if we're an <object>.
void MaybeFireErrorEvent();
// The final listener for mChannel (uriloader, pluginstreamlistener, etc.)
nsCOMPtr<nsIStreamListener> mFinalListener;
// Track if we have a pending AsyncInstantiateEvent
nsCOMPtr<nsIRunnable> mPendingInstantiateEvent;
// Tracks if we have a pending CheckPluginStopEvent
nsCOMPtr<nsIRunnable> mPendingCheckPluginStopEvent;
// 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 : 8;
// The type of fallback content we're showing (see ObjectState())
FallbackType mFallbackType : 8;
uint32_t mRunID;
bool mHasRunID : 1;
// 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;
// Whether we are about to call instantiate on our frame. If we aren't,
// SetFrame needs to asynchronously call Instantiate.
bool mInstantiating : 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;
// Used to keep track of whether or not a plugin has been explicitly
// activated by PlayPlugin(). (see ShouldPlay())
bool mActivated : 1;
// Whether content blocking is enabled or not for this object.
bool mContentBlockingEnabled : 1;
// If we should not use fake plugins until the next type change
bool mSkipFakePlugins : 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;
// Cache the answer of PreferFallback() because ShouldPlay is called several
// times during the load process.
bool mPreferFallback : 1;
bool mPreferFallbackKnown : 1;
WeakFrame mPrintFrame;
RefPtr<nsPluginInstanceOwner> mInstanceOwner;
nsTArray<mozilla::dom::MozPluginParameter> mCachedAttributes;
nsTArray<mozilla::dom::MozPluginParameter> mCachedParameters;
};
#endif
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