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/* vim: set sw=2 ts=8 et 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 */
#ifndef mozilla_net_DocumentLoadListener_h
#define mozilla_net_DocumentLoadListener_h
#include "mozilla/MozPromise.h"
#include "mozilla/Variant.h"
#include "mozilla/WeakPtr.h"
#include "mozilla/ipc/Endpoint.h"
#include "mozilla/dom/SessionHistoryEntry.h"
#include "EarlyHintsService.h"
#include "mozilla/net/NeckoCommon.h"
#include "mozilla/net/NeckoParent.h"
#include "mozilla/net/PDocumentChannelParent.h"
#include "mozilla/net/ParentChannelListener.h"
#include "nsDOMNavigationTiming.h"
#include "nsIBrowser.h"
#include "nsIChannelEventSink.h"
#include "nsIEarlyHintObserver.h"
#include "nsIInterfaceRequestor.h"
#include "nsIMultiPartChannel.h"
#include "nsIParentChannel.h"
#include "nsIParentRedirectingChannel.h"
#include "nsIProgressEventSink.h"
#include "nsIRedirectResultListener.h"
{ \
0x3b393c56, 0x9e01, 0x11e9, { \
0xa2, 0xa3, 0x2a, 0x2a, 0xe2, 0xdb, 0xcc, 0xe4 \
} \
namespace mozilla {
namespace dom {
class CanonicalBrowsingContext;
struct NavigationIsolationOptions;
} // namespace dom
namespace net {
using ChildEndpointPromise =
MozPromise<mozilla::ipc::Endpoint<extensions::PStreamFilterChild>, bool,
// If we've been asked to attach a stream filter to our channel,
// then we return this promise and defer until we know the final
// content process. At that point we setup Endpoints between
// mStramFilterProcessId and the new content process, and send
// the parent Endpoint to the new process.
// Once we have confirmation of that being bound in the content
// process, we resolve the promise the child Endpoint.
struct StreamFilterRequest {
StreamFilterRequest() = default;
StreamFilterRequest(StreamFilterRequest&&) = default;
~StreamFilterRequest() {
if (mPromise) {
mPromise->Reject(false, __func__);
RefPtr<ChildEndpointPromise::Private> mPromise;
mozilla::ipc::Endpoint<extensions::PStreamFilterChild> mChildEndpoint;
} // namespace net
} // namespace mozilla
namespace mozilla {
namespace net {
class LoadInfo;
* DocumentLoadListener represents a connecting document load for a
* CanonicalBrowsingContext (in the parent process).
* It creates a network channel for the document load and then waits for it to
* receive a response (after all redirects are resolved). It then decides where
* to handle that load (could be in a different process from the initiator),
* and then sets up a real network nsIChannel to deliver the data to the final
* destination docshell, maybe through an nsIParentChannel/nsIChildChannel IPDL
* layer.
* In the case where this was initiated from an nsDocShell, we also create an
* nsIChannel to act as a placeholder within the docshell while this process
* completes, and then notify the docshell of a 'redirect' when we replace this
* channel with the real one.
// TODO: We currently don't implement nsIProgressEventSink and forward those
// to the child. Should we? We get the interface requested.
class DocumentLoadListener : public nsIInterfaceRequestor,
public nsIAsyncVerifyRedirectReadyCallback,
public nsIParentChannel,
public nsIChannelEventSink,
public HttpChannelSecurityWarningReporter,
public nsIMultiPartChannelListener,
public nsIProgressEventSink,
public nsIEarlyHintObserver {
// See the comment on GetLoadingBrowsingContext for explanation of
// aLoadingBrowsingContext.
DocumentLoadListener(dom::CanonicalBrowsingContext* aLoadingBrowsingContext,
bool aIsDocumentLoad);
struct OpenPromiseSucceededType {
uint32_t mRedirectFlags;
uint32_t mLoadFlags;
uint32_t mEarlyHintLinkType;
struct OpenPromiseFailedType {
nsresult mStatus;
nsresult mLoadGroupStatus;
// This is set to true if the navigation in the content process should not
// be cancelled, as the load is logically continuing within the current
// browsing session, just within a different process or browsing context.
bool mContinueNavigating = false;
using OpenPromise =
MozPromise<OpenPromiseSucceededType, OpenPromiseFailedType, true>;
// Interface which may be provided when performing an <object> or <embed> load
// with `DocumentLoadListener`, to allow upgrading the Object load to a proper
// Document load.
struct ObjectUpgradeHandler : public SupportsWeakPtr {
using ObjectUpgradePromise =
MozPromise<RefPtr<dom::CanonicalBrowsingContext>, nsresult,
true /* isExclusive */>;
// Upgrade an object load to be a potentially remote document.
// The returned promise will resolve with the BrowsingContext which has been
// created in the <object> or <embed> element to finish the load with.
virtual RefPtr<ObjectUpgradePromise> UpgradeObjectLoad() = 0;
// Creates the channel, and then calls AsyncOpen on it.
// The DocumentLoadListener will require additional process from the consumer
// in order to complete the redirect to the end channel. This is done by
// returning a RedirectToRealChannelPromise and then waiting for it to be
// resolved or rejected accordingly.
// Once that promise is resolved; the consumer no longer needs to hold a
// reference to the DocumentLoadListener nor will the consumer required to be
// used again.
RefPtr<OpenPromise> Open(nsDocShellLoadState* aLoadState, LoadInfo* aLoadInfo,
nsLoadFlags aLoadFlags, uint32_t aCacheKey,
const Maybe<uint64_t>& aChannelId,
const TimeStamp& aAsyncOpenTime,
nsDOMNavigationTiming* aTiming,
Maybe<dom::ClientInfo>&& aInfo, bool aUrgentStart,
dom::ContentParent* aContentParent, nsresult* aRv);
RefPtr<OpenPromise> OpenDocument(
nsDocShellLoadState* aLoadState, uint32_t aCacheKey,
const Maybe<uint64_t>& aChannelId, const TimeStamp& aAsyncOpenTime,
nsDOMNavigationTiming* aTiming, Maybe<dom::ClientInfo>&& aInfo,
Maybe<bool> aUriModified, Maybe<bool> aIsEmbeddingBlockedError,
dom::ContentParent* aContentParent, nsresult* aRv);
RefPtr<OpenPromise> OpenObject(
nsDocShellLoadState* aLoadState, uint32_t aCacheKey,
const Maybe<uint64_t>& aChannelId, const TimeStamp& aAsyncOpenTime,
nsDOMNavigationTiming* aTiming, Maybe<dom::ClientInfo>&& aInfo,
uint64_t aInnerWindowId, nsLoadFlags aLoadFlags,
nsContentPolicyType aContentPolicyType, bool aUrgentStart,
dom::ContentParent* aContentParent,
ObjectUpgradeHandler* aObjectUpgradeHandler, nsresult* aRv);
// Creates a DocumentLoadListener entirely in the parent process and opens it,
// and never needs a DocumentChannel to connect to an existing docshell.
// Once we get a response it takes the 'process switch' path to find the right
// process and docshell, and delivers the response there directly.
static bool LoadInParent(dom::CanonicalBrowsingContext* aBrowsingContext,
nsDocShellLoadState* aLoadState,
bool aSetNavigating);
// Creates a DocumentLoadListener directly in the parent process and opens it,
// without needing an existing DocumentChannel.
// If successful it registers a unique identifier (return in aOutIdent) to
// keep it alive until a future DocumentChannel can attach to it, or we fail
// and clean up.
static bool SpeculativeLoadInParent(
dom::CanonicalBrowsingContext* aBrowsingContext,
nsDocShellLoadState* aLoadState);
// Ensures that a load identifier allocated by OpenFromParent has
// been deregistered if it hasn't already been claimed.
// This also cancels the load.
static void CleanupParentLoadAttempt(uint64_t aLoadIdent);
// Looks up aLoadIdent to find the associated, cleans up the registration
static RefPtr<OpenPromise> ClaimParentLoad(DocumentLoadListener** aListener,
uint64_t aLoadIdent,
Maybe<uint64_t> aChannelId);
// Called by the DocumentChannelParent if actor got destroyed or the parent
// channel got deleted.
void Abort();
// We suspend the underlying channel when replacing ourselves with
// the real listener channel.
// This helper resumes the underlying channel again, and manually
// forwards any nsIStreamListener messages that arrived while we
// were suspended (which might have failed).
// Returns true if the channel was finished before we could resume it.
bool ResumeSuspendedChannel(nsIStreamListener* aListener);
// Called by the DocumentChannel if cancelled.
void Cancel(const nsresult& aStatusCode, const nsACString& aReason);
nsIChannel* GetChannel() const { return mChannel; }
uint32_t GetRedirectChannelId() const { return mRedirectChannelId; }
nsresult ReportSecurityMessage(const nsAString& aMessageTag,
const nsAString& aMessageCategory) override {
ReportSecurityMessageParams params;
params.mMessageTag = aMessageTag;
params.mMessageCategory = aMessageCategory;
SecurityWarningFunction{VariantIndex<0>{}, std::move(params)});
return NS_OK;
nsresult LogBlockedCORSRequest(const nsAString& aMessage,
const nsACString& aCategory,
bool aIsWarning) override {
LogBlockedCORSRequestParams params;
params.mMessage = aMessage;
params.mCategory = aCategory;
params.mIsWarning = aIsWarning;
SecurityWarningFunction{VariantIndex<1>{}, std::move(params)});
return NS_OK;
nsresult LogMimeTypeMismatch(const nsACString& aMessageName, bool aWarning,
const nsAString& aURL,
const nsAString& aContentType) override {
LogMimeTypeMismatchParams params;
params.mMessageName = aMessageName;
params.mWarning = aWarning;
params.mURL = aURL;
params.mContentType = aContentType;
SecurityWarningFunction{VariantIndex<2>{}, std::move(params)});
return NS_OK;
// The content process corresponding to this DocumentLoadListener, or nullptr
// if connected to the parent process.
dom::ContentParent* GetContentParent() const { return mContentParent; }
// The process id of the content process that we are being called from
// or 0 initiated from a parent process load.
base::ProcessId OtherPid() const;
[[nodiscard]] RefPtr<ChildEndpointPromise> AttachStreamFilter();
// EarlyHints aren't supported on ParentProcessDocumentChannels yet, allow
// EarlyHints to be cancelled from there (Bug 1819886)
void CancelEarlyHintPreloads();
// Gets the EarlyHint preloads for this document to pass them to the
// ContentProcess. Registers them in the EarlyHintRegister
void RegisterEarlyHintLinksAndGetConnectArgs(
dom::ContentParentId aCpId, nsTArray<EarlyHintConnectArgs>& aOutLinks);
// Serializes all data needed to setup the new replacement channel
// in the content process into the RedirectToRealChannelArgs struct.
void SerializeRedirectData(RedirectToRealChannelArgs& aArgs,
bool aIsCrossProcess, uint32_t aRedirectFlags,
uint32_t aLoadFlags,
nsTArray<EarlyHintConnectArgs>&& aEarlyHints,
uint32_t aEarlyHintLinkType) const;
uint64_t GetLoadIdentifier() const { return mLoadIdentifier; }
uint32_t GetLoadType() const { return mLoadStateLoadType; }
bool IsDownload() const { return mIsDownload; }
bool IsLoadingJSURI() const { return mIsLoadingJSURI; }
nsDOMNavigationTiming* GetTiming() { return mTiming; }
mozilla::dom::LoadingSessionHistoryInfo* GetLoadingSessionHistoryInfo() {
return mLoadingSessionHistoryInfo.get();
bool IsDocumentLoad() const { return mIsDocumentLoad; }
// Determine what process switching behavior a browser element should have.
enum ProcessBehavior : uint8_t {
// Gecko won't automatically change which process this frame, or it's
// subframes, are loaded in.
// If `useRemoteTabs` is enabled, Gecko will change which process this frame
// is loaded in automatically, without calling `performProcessSwitch`.
// When `useRemoteSubframes` is enabled, subframes will change processes.
// Gecko won't automatically change which process this frame is loaded, but
// when `useRemoteSubframes` is enabled, subframes will change processes.
// NOTE: This configuration is included only for backwards compatibility,
// and will be removed, as it can easily lead to invalid behavior.
virtual ~DocumentLoadListener();
RefPtr<OpenPromise> OpenInParent(nsDocShellLoadState* aLoadState,
bool aSupportsRedirectToRealChannel);
friend class ParentProcessDocumentOpenInfo;
// Will reject the promise to notify the DLL consumer that we are done.
// If `aContinueNavigating` is true, the navigation in the content process
// will not be aborted, as navigation is logically continuing in the existing
// browsing session (e.g. due to a process switch or entering the bfcache).
void DisconnectListeners(nsresult aStatus, nsresult aLoadGroupStatus,
bool aContinueNavigating = false);
// Called when we were created without a document channel, and creation has
// failed, and won't ever be attached.
void NotifyDocumentChannelFailed();
// Initiates the switch from DocumentChannel to the real protocol-specific
// channel, and ensures that RedirectToRealChannelFinished is called when
// this is complete.
void TriggerRedirectToRealChannel(
const Maybe<dom::ContentParent*>& aDestinationProcess,
nsTArray<StreamFilterRequest> aStreamFilterRequests);
// Called once the content-process side on setting up a replacement
// channel is complete. May wait for the new parent channel to
// finish, and then calls into FinishReplacementChannelSetup.
void RedirectToRealChannelFinished(nsresult aRv);
// Completes the replacement of the new channel.
// This redirects the ParentChannelListener to forward any future
// messages to the new channel, manually forwards any being held
// by us, and resumes the underlying source channel.
void FinishReplacementChannelSetup(nsresult aResult);
// Called from `OnStartRequest` to make the decision about whether or not to
// change process. This method will return `nullptr` if the current target
// process is appropriate.
// aWillSwitchToRemote is set to true if we initiate a process switch,
// and that the new remote type will be something other than NOT_REMOTE
bool MaybeTriggerProcessSwitch(bool* aWillSwitchToRemote);
// Called when the process switch is going to happen, potentially
// asynchronously, from `MaybeTriggerProcessSwitch`.
// aContext should be the target context for the navigation. This will either
// be the loading BrowsingContext, the newly created BrowsingContext for an
// object or embed element load, or a newly created tab for new tab load.
// If `aIsNewTab` is specified, the navigation in the original process will be
// aborted immediately, rather than waiting for a process switch to happen and
// the previous page to be unloaded or hidden.
void TriggerProcessSwitch(dom::CanonicalBrowsingContext* aContext,
const dom::NavigationIsolationOptions& aOptions,
bool aIsNewTab = false);
// A helper for TriggerRedirectToRealChannel that abstracts over
// the same-process and cross-process switch cases and returns
// a single promise to wait on.
using ParentEndpoint =
RedirectToRealChannel(uint32_t aRedirectFlags, uint32_t aLoadFlags,
const Maybe<dom::ContentParent*>& aDestinationProcess,
nsTArray<ParentEndpoint>&& aStreamFilterEndpoints);
// A helper for RedirectToRealChannel that handles the case where we started
// from a content process and are process switching into the parent process.
RedirectToParentProcess(uint32_t aRedirectFlags, uint32_t aLoadFlags);
// Return the Browsing Context that is performing the load.
// For document loads, the BC is the one that the (sub)doc
// will load into. For <object>/<embed>, it's the embedder document's BC.
dom::CanonicalBrowsingContext* GetLoadingBrowsingContext() const;
// Return the Browsing Context that document is being loaded into. For
// non-document loads, this will return nullptr.
dom::CanonicalBrowsingContext* GetDocumentBrowsingContext() const;
dom::CanonicalBrowsingContext* GetTopBrowsingContext() const;
// Return the Window Context which which contains the element which the load
// is being performed in. For toplevel loads, this will return `nullptr`.
dom::WindowGlobalParent* GetParentWindowContext() const;
void AddURIVisit(nsIChannel* aChannel, uint32_t aLoadFlags);
bool HasCrossOriginOpenerPolicyMismatch() const;
void ApplyPendingFunctions(nsIParentChannel* aChannel) const;
void Disconnect(bool aContinueNavigating);
void MaybeReportBlockedByURLClassifier(nsresult aStatus);
// Returns true if a channel with aStatus will display
// some sort of content (could be the actual channel data,
// attempt a uri fixup and new load, or an error page).
// Returns false if the docshell will ignore the load entirely.
bool DocShellWillDisplayContent(nsresult aStatus);
void FireStateChange(uint32_t aStateFlags, nsresult aStatus);
// Returns true if this is a failed load, where we have successfully
// created a fixed URI to attempt loading instead.
// If successful, this calls DisconnectListeners to completely finish
// the current load, and calls BrowsingContext::LoadURI to start the new one.
bool MaybeHandleLoadErrorWithURIFixup(nsresult aStatus);
// This defines a variant that describes all the attribute setters (and their
// parameters) from nsIParentChannel
// SetClassifierMatchedInfo(const nsACString& aList, const nsACString&
// aProvider, const nsACString& aFullHash) = 0;
// SetClassifierMatchedTrackingInfo(const nsACString& aLists, const
// nsACString& aFullHashes) = 0; NotifyClassificationFlags(uint32_t
// aClassificationFlags, bool aIsThirdParty) = 0;
struct ClassifierMatchedInfoParams {
nsCString mList;
nsCString mProvider;
nsCString mFullHash;
struct ClassifierMatchedTrackingInfoParams {
nsCString mLists;
nsCString mFullHashes;
struct ClassificationFlagsParams {
uint32_t mClassificationFlags;
bool mIsThirdParty;
using IParentChannelFunction =
// Store a list of all the attribute setters that have been called on this
// channel, so that we can repeat them on the real channel that we redirect
// to.
nsTArray<IParentChannelFunction> mIParentChannelFunctions;
// This defines a variant this describes all the functions
// from HttpChannelSecurityWarningReporter so that we can forward
// them on to the real channel.
struct ReportSecurityMessageParams {
nsString mMessageTag;
nsString mMessageCategory;
struct LogBlockedCORSRequestParams {
nsString mMessage;
nsCString mCategory;
bool mIsWarning;
struct LogMimeTypeMismatchParams {
nsCString mMessageName;
bool mWarning = false;
nsString mURL;
nsString mContentType;
using SecurityWarningFunction =
mozilla::Variant<ReportSecurityMessageParams, LogBlockedCORSRequestParams,
nsTArray<SecurityWarningFunction> mSecurityWarningFunctions;
// TODO Backtrack this.
// The set of nsIStreamListener functions that got called on this
// listener, so that we can replay them onto the replacement channel's
// listener. This should generally only be OnStartRequest, since we
// Suspend() the channel at that point, but it can fail sometimes
// so we have to support holding a list.
nsTArray<StreamListenerFunction> mStreamListenerFunctions;
nsCOMPtr<nsIChannel> mChannel;
Maybe<uint64_t> mDocumentChannelId;
// An instance of ParentChannelListener that we use as a listener
// between mChannel (and any future redirected mChannels) and us.
// This handles service worker interception, and retargetting
// OnDataAvailable/OnStopRequest messages onto the listener that
// replaces us.
RefPtr<ParentChannelListener> mParentChannelListener;
// Get the channel creation URI for constructing the channel in the content
// process. See the function for more details.
nsIURI* GetChannelCreationURI() const;
// The original navigation timing information containing various timestamps
// such as when the original load started.
// This will be passed back to the new content process should a process
// switch occurs.
RefPtr<nsDOMNavigationTiming> mTiming;
net::EarlyHintsService mEarlyHintsService;
// An optional ObjectUpgradeHandler which can be used to upgrade an <object>
// or <embed> element to contain a nsFrameLoader, allowing us to switch them
// into a different process.
// A weak pointer is held in order to avoid reference cycles.
WeakPtr<ObjectUpgradeHandler> mObjectUpgradeHandler;
// Used to identify an internal redirect in redirect chain.
// True when we have seen at least one non-interal redirect.
bool mHaveVisibleRedirect = false;
// Pending stream filter requests which should be attached when redirecting to
// the real channel. Moved into `TriggerRedirectToRealChannel` when the
// connection is ready.
nsTArray<StreamFilterRequest> mStreamFilterRequests;
nsString mSrcdocData;
nsCOMPtr<nsIURI> mBaseURI;
RefPtr<dom::WindowGlobalParent> mParentWindowContext;
// Flags from nsDocShellLoadState::LoadFlags/Type that we want to make
// available to the new docshell if we switch processes.
uint32_t mLoadStateExternalLoadFlags = 0;
uint32_t mLoadStateInternalLoadFlags = 0;
uint32_t mLoadStateLoadType = 0;
// Indicates if this load is a download.
bool mIsDownload = false;
// Indicates if we are loading a javascript URI.
bool mIsLoadingJSURI = false;
// Corresponding redirect channel registrar Id for the final channel that
// we want to use when redirecting the child, or doing a process switch.
// 0 means redirection is not started.
uint64_t mRedirectChannelId = 0;
// Set to true once we initiate the redirect to a real channel (either
// via a process switch or a same-process redirect, and Suspend the
// underlying channel.
bool mInitiatedRedirectToRealChannel = false;
// The value of GetApplyConversion on mChannel when OnStartRequest
// was called. We override it to false to prevent a conversion
// helper from being installed, but we need to restore the value
// later.
bool mOldApplyConversion = false;
// Set to true if any previous channel that we redirected away
// from had a COOP mismatch.
bool mHasCrossOriginOpenerPolicyMismatch = false;
// Set to true if we've received OnStopRequest, and shouldn't
// setup a reference from the ParentChannelListener to the replacement
// channel.
bool mIsFinished = false;
// The id of the currently pending load which is
// passed to the childChannel in order to identify it in the new process.
uint64_t mLoadIdentifier = 0;
Maybe<nsCString> mOriginalUriString;
// Parent-initiated loads do not support redirects to real channels.
bool mSupportsRedirectToRealChannel = true;
Maybe<nsCString> mRemoteTypeOverride;
// The ContentParent which this channel is currently connected to, or nullptr
// if connected to the parent process.
RefPtr<dom::ContentParent> mContentParent;
void RejectOpenPromise(nsresult aStatus, nsresult aLoadGroupStatus,
bool aContinueNavigating, StaticString aLocation) {
// It is possible for mOpenPromise to not be set if AsyncOpen failed and
// the DocumentChannel got canceled.
if (!mOpenPromiseResolved && mOpenPromise) {
mOpenPromise->Reject(OpenPromiseFailedType({aStatus, aLoadGroupStatus,
mOpenPromiseResolved = true;
RefPtr<OpenPromise::Private> mOpenPromise;
bool mOpenPromiseResolved = false;
const bool mIsDocumentLoad;
RefPtr<HTTPSFirstDowngradeData> mHTTPSFirstDowngradeData;
inline nsISupports* ToSupports(DocumentLoadListener* aObj) {
return static_cast<nsIInterfaceRequestor*>(aObj);
} // namespace net
} // namespace mozilla
#endif // mozilla_net_DocumentChannelParent_h