palemoon27/netwerk/protocol/http/HttpChannelParent.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 http://mozilla.org/MPL/2.0/. */

// HttpLog.h should generally be included first
#include "HttpLog.h"

#include "mozilla/ipc/FileDescriptorSetParent.h"
#include "mozilla/net/HttpChannelParent.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/TabParent.h"
#include "mozilla/net/NeckoParent.h"
#include "mozilla/unused.h"
#include "HttpChannelParentListener.h"
#include "nsHttpHandler.h"
#include "nsNetUtil.h"
#include "nsISupportsPriority.h"
#include "nsIAuthPromptProvider.h"
#include "nsSerializationHelper.h"
#include "nsISerializable.h"
#include "nsIAssociatedContentSecurity.h"
#include "nsIApplicationCacheService.h"
#include "mozilla/ipc/InputStreamUtils.h"
#include "mozilla/ipc/URIUtils.h"
#include "SerializedLoadContext.h"
#include "nsIAuthInformation.h"
#include "nsIAuthPromptCallback.h"
#include "nsIContentPolicy.h"
#include "mozilla/ipc/BackgroundUtils.h"
#include "nsIOService.h"
#include "nsICachingChannel.h"
#include "mozilla/LoadInfo.h"
#include "nsIHttpHeaderVisitor.h"
#include "nsQueryObject.h"
#include "mozilla/BasePrincipal.h"
#include "nsCORSListenerProxy.h"
#include "nsIPrompt.h"
#include "nsIWindowWatcher.h"
#include "nsIDocument.h"

using mozilla::BasePrincipal;
using mozilla::OriginAttributes;
using namespace mozilla::dom;
using namespace mozilla::ipc;

namespace mozilla {
namespace net {

HttpChannelParent::HttpChannelParent(const PBrowserOrId& iframeEmbedding,
                                     nsILoadContext* aLoadContext,
                                     PBOverrideStatus aOverrideStatus)
  : mIPCClosed(false)
  , mStoredStatus(NS_OK)
  , mStoredProgress(0)
  , mStoredProgressMax(0)
  , mSentRedirect1Begin(false)
  , mSentRedirect1BeginFailed(false)
  , mReceivedRedirect2Verify(false)
  , mPBOverride(aOverrideStatus)
  , mLoadContext(aLoadContext)
  , mStatus(NS_OK)
  , mDivertingFromChild(false)
  , mDivertedOnStartRequest(false)
  , mSuspendedForDiversion(false)
  , mShouldIntercept(false)
  , mShouldSuspendIntercept(false)
  , mNestedFrameId(0)
{
  LOG(("Creating HttpChannelParent [this=%p]\n", this));

  // Ensure gHttpHandler is initialized: we need the atom table up and running.
  nsCOMPtr<nsIHttpProtocolHandler> dummyInitializer =
    do_GetService(NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "http");

  MOZ_ASSERT(gHttpHandler);
  mHttpHandler = gHttpHandler;

  if (iframeEmbedding.type() == PBrowserOrId::TPBrowserParent) {
    mTabParent = static_cast<dom::TabParent*>(iframeEmbedding.get_PBrowserParent());
  } else {
    mNestedFrameId = iframeEmbedding.get_TabId();
  }

  mObserver = new OfflineObserver(this);

  mEventQ = new ChannelEventQueue(static_cast<nsIParentRedirectingChannel*>(this));
}

HttpChannelParent::~HttpChannelParent()
{
  LOG(("Destroying HttpChannelParent [this=%p]\n", this));
  if (mObserver) {
    mObserver->RemoveObserver();
  }
}

void
HttpChannelParent::ActorDestroy(ActorDestroyReason why)
{
  // We may still have refcount>0 if nsHttpChannel hasn't called OnStopRequest
  // yet, but child process has crashed.  We must not try to send any more msgs
  // to child, or IPDL will kill chrome process, too.
  mIPCClosed = true;

  // If this is an intercepted channel, we need to make sure that any resources are
  // cleaned up to avoid leaks.
  if (mInterceptedChannel) {
    mInterceptedChannel->Cancel(NS_ERROR_INTERCEPTION_FAILED);
    mInterceptedChannel = nullptr;
  }
}

bool
HttpChannelParent::Init(const HttpChannelCreationArgs& aArgs)
{
  LOG(("HttpChannelParent::Init [this=%p]\n", this));
  switch (aArgs.type()) {
  case HttpChannelCreationArgs::THttpChannelOpenArgs:
  {
    const HttpChannelOpenArgs& a = aArgs.get_HttpChannelOpenArgs();
    return DoAsyncOpen(a.uri(), a.original(), a.doc(), a.referrer(),
                       a.referrerPolicy(), a.apiRedirectTo(), a.topWindowURI(),
                       a.loadFlags(), a.requestHeaders(),
                       a.requestMethod(), a.uploadStream(),
                       a.uploadStreamHasHeaders(), a.priority(), a.classOfService(),
                       a.redirectionLimit(), a.allowPipelining(), a.allowSTS(),
                       a.thirdPartyFlags(), a.resumeAt(), a.startPos(),
                       a.entityID(), a.chooseApplicationCache(),
                       a.appCacheClientID(), a.allowSpdy(), a.allowAltSvc(), a.fds(),
                       a.loadInfo(), a.synthesizedResponseHead(),
                       a.synthesizedSecurityInfoSerialization(),
                       a.cacheKey(), a.schedulingContextID(), a.preflightArgs(),
                       a.initialRwin(), a.allowStaleCacheContent());
  }
  case HttpChannelCreationArgs::THttpChannelConnectArgs:
  {
    const HttpChannelConnectArgs& cArgs = aArgs.get_HttpChannelConnectArgs();
    return ConnectChannel(cArgs.channelId(), cArgs.shouldIntercept());
  }
  default:
    NS_NOTREACHED("unknown open type");
    return false;
  }
}

//-----------------------------------------------------------------------------
// HttpChannelParent::nsISupports
//-----------------------------------------------------------------------------

NS_IMPL_ISUPPORTS(HttpChannelParent,
                  nsIInterfaceRequestor,
                  nsIProgressEventSink,
                  nsIRequestObserver,
                  nsIStreamListener,
                  nsIPackagedAppChannelListener,
                  nsIParentChannel,
                  nsIAuthPromptProvider,
                  nsIParentRedirectingChannel,
                  nsINetworkInterceptController,
                  nsIDeprecationWarner)

NS_IMETHODIMP
HttpChannelParent::ShouldPrepareForIntercept(nsIURI* aURI,
                                             bool aIsNonSubresourceRequest,
                                             bool* aShouldIntercept)
{
  *aShouldIntercept = mShouldIntercept;
  return NS_OK;
}

class HeaderVisitor final : public nsIHttpHeaderVisitor
{
  nsCOMPtr<nsIInterceptedChannel> mChannel;
  ~HeaderVisitor()
  {
  }
public:
  explicit HeaderVisitor(nsIInterceptedChannel* aChannel) : mChannel(aChannel)
  {
  }

  NS_DECL_ISUPPORTS

  NS_IMETHOD VisitHeader(const nsACString& aHeader, const nsACString& aValue) override
  {
    mChannel->SynthesizeHeader(aHeader, aValue);
    return NS_OK;
  }
};

NS_IMPL_ISUPPORTS(HeaderVisitor, nsIHttpHeaderVisitor)

class FinishSynthesizedResponse : public nsRunnable
{
  nsCOMPtr<nsIInterceptedChannel> mChannel;
public:
  explicit FinishSynthesizedResponse(nsIInterceptedChannel* aChannel)
  : mChannel(aChannel)
  {
  }

  NS_IMETHOD Run()
  {
    // The URL passed as an argument here doesn't matter, since the child will
    // receive a redirection notification as a result of this synthesized response.
    mChannel->FinishSynthesizedResponse(EmptyCString());
    return NS_OK;
  }
};

class ResponseSynthesizer final : public nsIFetchEventDispatcher
{
public:
  ResponseSynthesizer(nsIInterceptedChannel* aChannel,
                       HttpChannelParent* aParentChannel)
    : mChannel(aChannel)
    , mParentChannel(aParentChannel)
  {
  }

  NS_DECL_ISUPPORTS
  NS_DECL_NSIFETCHEVENTDISPATCHER

private:
  ~ResponseSynthesizer()
  {
  }

  nsCOMPtr<nsIInterceptedChannel> mChannel;
  RefPtr<HttpChannelParent> mParentChannel;
};

NS_IMPL_ISUPPORTS(ResponseSynthesizer, nsIFetchEventDispatcher)

NS_IMETHODIMP
ResponseSynthesizer::Dispatch()
{
  mParentChannel->SynthesizeResponse(mChannel);

  return NS_OK;
}

NS_IMETHODIMP
HttpChannelParent::ChannelIntercepted(nsIInterceptedChannel* aChannel,
                                      nsIFetchEventDispatcher** aDispatcher)
{
  RefPtr<ResponseSynthesizer> dispatcher =
    new ResponseSynthesizer(aChannel, this);
  dispatcher.forget(aDispatcher);
  return NS_OK;
}

void
HttpChannelParent::SynthesizeResponse(nsIInterceptedChannel* aChannel)
{
  if (mShouldSuspendIntercept) {
    mInterceptedChannel = aChannel;
    return;
  }

  aChannel->SynthesizeStatus(mSynthesizedResponseHead->Status(),
                             mSynthesizedResponseHead->StatusText());
  nsCOMPtr<nsIHttpHeaderVisitor> visitor = new HeaderVisitor(aChannel);
  mSynthesizedResponseHead->Headers().VisitHeaders(visitor);

  nsCOMPtr<nsIRunnable> event = new FinishSynthesizedResponse(aChannel);
  NS_DispatchToCurrentThread(event);

  mSynthesizedResponseHead = nullptr;
}

//-----------------------------------------------------------------------------
// HttpChannelParent::nsIInterfaceRequestor
//-----------------------------------------------------------------------------

NS_IMETHODIMP
HttpChannelParent::GetInterface(const nsIID& aIID, void **result)
{
  if (aIID.Equals(NS_GET_IID(nsIAuthPromptProvider)) ||
      aIID.Equals(NS_GET_IID(nsISecureBrowserUI))) {
    if (mTabParent) {
      return mTabParent->QueryInterface(aIID, result);
    }
  }

  // Only support nsIAuthPromptProvider in Content process
  if (XRE_IsParentProcess() &&
      aIID.Equals(NS_GET_IID(nsIAuthPromptProvider))) {
    *result = nullptr;
    return NS_OK;
  }

  // Only support nsILoadContext if child channel's callbacks did too
  if (aIID.Equals(NS_GET_IID(nsILoadContext)) && mLoadContext) {
    nsCOMPtr<nsILoadContext> copy = mLoadContext;
    copy.forget(result);
    return NS_OK;
  }

  if (mTabParent && aIID.Equals(NS_GET_IID(nsIPrompt))) {
    nsCOMPtr<Element> frameElement = mTabParent->GetOwnerElement();
    if (frameElement) {
      nsresult rv;
      nsCOMPtr<nsIDOMWindow> win =
        do_QueryInterface(frameElement->OwnerDoc()->GetWindow(), &rv);

      if (NS_WARN_IF(!NS_SUCCEEDED(rv))) {
        return rv;
      }

      nsCOMPtr<nsIWindowWatcher> wwatch =
        do_GetService(NS_WINDOWWATCHER_CONTRACTID, &rv);

      if (NS_WARN_IF(!NS_SUCCEEDED(rv))) {
        return rv;
      }

      nsCOMPtr<nsIPrompt> prompt;
      rv = wwatch->GetNewPrompter(win, getter_AddRefs(prompt));
      if (NS_WARN_IF(!NS_SUCCEEDED(rv))) {
        return rv;
      }

      prompt.forget(result);
      return NS_OK;
    }
  }

  return QueryInterface(aIID, result);
}

//-----------------------------------------------------------------------------
// HttpChannelParent::PHttpChannelParent
//-----------------------------------------------------------------------------

bool
HttpChannelParent::DoAsyncOpen(  const URIParams&           aURI,
                                 const OptionalURIParams&   aOriginalURI,
                                 const OptionalURIParams&   aDocURI,
                                 const OptionalURIParams&   aReferrerURI,
                                 const uint32_t&            aReferrerPolicy,
                                 const OptionalURIParams&   aAPIRedirectToURI,
                                 const OptionalURIParams&   aTopWindowURI,
                                 const uint32_t&            aLoadFlags,
                                 const RequestHeaderTuples& requestHeaders,
                                 const nsCString&           requestMethod,
                                 const OptionalInputStreamParams& uploadStream,
                                 const bool&                uploadStreamHasHeaders,
                                 const uint16_t&            priority,
                                 const uint32_t&            classOfService,
                                 const uint8_t&             redirectionLimit,
                                 const bool&                allowPipelining,
                                 const bool&                allowSTS,
                                 const uint32_t&            thirdPartyFlags,
                                 const bool&                doResumeAt,
                                 const uint64_t&            startPos,
                                 const nsCString&           entityID,
                                 const bool&                chooseApplicationCache,
                                 const nsCString&           appCacheClientID,
                                 const bool&                allowSpdy,
                                 const bool&                allowAltSvc,
                                 const OptionalFileDescriptorSet& aFds,
                                 const OptionalLoadInfoArgs& aLoadInfoArgs,
                                 const OptionalHttpResponseHead& aSynthesizedResponseHead,
                                 const nsCString&           aSecurityInfoSerialization,
                                 const uint32_t&            aCacheKey,
                                 const nsCString&           aSchedulingContextID,
                                 const OptionalCorsPreflightArgs& aCorsPreflightArgs,
                                 const uint32_t&            aInitialRwin,
                                 const bool&                aAllowStaleCacheContent)
{
  nsCOMPtr<nsIURI> uri = DeserializeURI(aURI);
  if (!uri) {
    // URIParams does MOZ_ASSERT if null, but we need to protect opt builds from
    // null deref here.
    return false;
  }
  nsCOMPtr<nsIURI> originalUri = DeserializeURI(aOriginalURI);
  nsCOMPtr<nsIURI> docUri = DeserializeURI(aDocURI);
  nsCOMPtr<nsIURI> referrerUri = DeserializeURI(aReferrerURI);
  nsCOMPtr<nsIURI> apiRedirectToUri = DeserializeURI(aAPIRedirectToURI);
  nsCOMPtr<nsIURI> topWindowUri = DeserializeURI(aTopWindowURI);

  nsCString uriSpec;
  uri->GetSpec(uriSpec);
  LOG(("HttpChannelParent RecvAsyncOpen [this=%p uri=%s]\n",
       this, uriSpec.get()));

  nsresult rv;

  nsCOMPtr<nsIIOService> ios(do_GetIOService(&rv));
  if (NS_FAILED(rv))
    return SendFailedAsyncOpen(rv);

  bool appOffline = false;
  uint32_t appId = GetAppId();
  if (appId != NECKO_UNKNOWN_APP_ID &&
      appId != NECKO_NO_APP_ID) {
    gIOService->IsAppOffline(appId, &appOffline);
  }

  uint32_t loadFlags = aLoadFlags;
  if (appOffline) {
    loadFlags |= nsICachingChannel::LOAD_ONLY_FROM_CACHE;
    loadFlags |= nsIRequest::LOAD_FROM_CACHE;
    loadFlags |= nsICachingChannel::LOAD_NO_NETWORK_IO;
  }

  nsCOMPtr<nsILoadInfo> loadInfo;
  rv = mozilla::ipc::LoadInfoArgsToLoadInfo(aLoadInfoArgs,
                                            getter_AddRefs(loadInfo));
  if (NS_FAILED(rv)) {
    return SendFailedAsyncOpen(rv);
  }

  nsCOMPtr<nsIChannel> channel;
  rv = NS_NewChannelInternal(getter_AddRefs(channel), uri, loadInfo,
                             nullptr, nullptr, loadFlags, ios);

  if (NS_FAILED(rv))
    return SendFailedAsyncOpen(rv);

  mChannel = static_cast<nsHttpChannel *>(channel.get());
  mChannel->SetWarningReporter(this);
  mChannel->SetTimingEnabled(true);
  if (mPBOverride != kPBOverride_Unset) {
    mChannel->SetPrivate(mPBOverride == kPBOverride_Private ? true : false);
  }

  if (doResumeAt)
    mChannel->ResumeAt(startPos, entityID);

  if (originalUri)
    mChannel->SetOriginalURI(originalUri);
  if (docUri)
    mChannel->SetDocumentURI(docUri);
  if (referrerUri)
    mChannel->SetReferrerWithPolicyInternal(referrerUri, aReferrerPolicy);
  if (apiRedirectToUri)
    mChannel->RedirectTo(apiRedirectToUri);
  if (topWindowUri)
    mChannel->SetTopWindowURI(topWindowUri);
  if (loadFlags != nsIRequest::LOAD_NORMAL)
    mChannel->SetLoadFlags(loadFlags);

  for (uint32_t i = 0; i < requestHeaders.Length(); i++) {
    if (requestHeaders[i].mEmpty) {
      mChannel->SetEmptyRequestHeader(requestHeaders[i].mHeader);
    } else {
      mChannel->SetRequestHeader(requestHeaders[i].mHeader,
                                 requestHeaders[i].mValue,
                                 requestHeaders[i].mMerge);
    }
  }

  mParentListener = new HttpChannelParentListener(this);

  mChannel->SetNotificationCallbacks(mParentListener);

  mChannel->SetRequestMethod(nsDependentCString(requestMethod.get()));

  nsTArray<mozilla::ipc::FileDescriptor> fds;
  if (aFds.type() == OptionalFileDescriptorSet::TPFileDescriptorSetParent) {
    FileDescriptorSetParent* fdSetActor =
      static_cast<FileDescriptorSetParent*>(aFds.get_PFileDescriptorSetParent());
    MOZ_ASSERT(fdSetActor);

    fdSetActor->ForgetFileDescriptors(fds);
    MOZ_ASSERT(!fds.IsEmpty());

    Unused << fdSetActor->Send__delete__(fdSetActor);
  } else if (aFds.type() == OptionalFileDescriptorSet::TArrayOfFileDescriptor) {
    const_cast<OptionalFileDescriptorSet&>(aFds).
      get_ArrayOfFileDescriptor().SwapElements(fds);
  }

  if (aCorsPreflightArgs.type() == OptionalCorsPreflightArgs::TCorsPreflightArgs) {
    const CorsPreflightArgs& args = aCorsPreflightArgs.get_CorsPreflightArgs();
    nsCOMPtr<nsIPrincipal> preflightPrincipal =
      PrincipalInfoToPrincipal(args.preflightPrincipal());
    rv = mChannel->SetCorsPreflightParameters(args.unsafeHeaders(),
                                              args.withCredentials(),
                                              preflightPrincipal);
    if (NS_FAILED(rv)) {
      return SendFailedAsyncOpen(rv);
    }
  }

  nsCOMPtr<nsIInputStream> stream = DeserializeInputStream(uploadStream, fds);
  if (stream) {
    mChannel->InternalSetUploadStream(stream);
    mChannel->SetUploadStreamHasHeaders(uploadStreamHasHeaders);
  }

  mChannel->SetAllowStaleCacheContent(aAllowStaleCacheContent);

  if (aSynthesizedResponseHead.type() == OptionalHttpResponseHead::TnsHttpResponseHead) {
    mSynthesizedResponseHead = new nsHttpResponseHead(aSynthesizedResponseHead.get_nsHttpResponseHead());
    mShouldIntercept = true;
    mChannel->SetCouldBeSynthesized();

    if (!aSecurityInfoSerialization.IsEmpty()) {
      nsCOMPtr<nsISupports> secInfo;
      NS_DeserializeObject(aSecurityInfoSerialization, getter_AddRefs(secInfo));
      mChannel->OverrideSecurityInfo(secInfo);
    }

  } else {
    nsLoadFlags loadFlags;
    mChannel->GetLoadFlags(&loadFlags);
    loadFlags |= nsIChannel::LOAD_BYPASS_SERVICE_WORKER;
    mChannel->SetLoadFlags(loadFlags);
  }

  nsCOMPtr<nsISupportsPRUint32> cacheKey =
    do_CreateInstance(NS_SUPPORTS_PRUINT32_CONTRACTID, &rv);
  if (NS_FAILED(rv)) {
    return SendFailedAsyncOpen(rv);
  }

  rv = cacheKey->SetData(aCacheKey);
  if (NS_FAILED(rv)) {
    return SendFailedAsyncOpen(rv);
  }

  mChannel->SetCacheKey(cacheKey);

  if (priority != nsISupportsPriority::PRIORITY_NORMAL) {
    mChannel->SetPriority(priority);
  }
  if (classOfService) {
    mChannel->SetClassFlags(classOfService);
  }
  mChannel->SetRedirectionLimit(redirectionLimit);
  mChannel->SetAllowPipelining(allowPipelining);
  mChannel->SetAllowSTS(allowSTS);
  mChannel->SetThirdPartyFlags(thirdPartyFlags);
  mChannel->SetAllowSpdy(allowSpdy);
  mChannel->SetAllowAltSvc(allowAltSvc);
  mChannel->SetInitialRwin(aInitialRwin);

  nsCOMPtr<nsIApplicationCacheChannel> appCacheChan =
    do_QueryObject(mChannel);
  nsCOMPtr<nsIApplicationCacheService> appCacheService =
    do_GetService(NS_APPLICATIONCACHESERVICE_CONTRACTID);

  bool setChooseApplicationCache = chooseApplicationCache;
  if (appCacheChan && appCacheService) {
    // We might potentially want to drop this flag (that is TRUE by default)
    // after we successfully associate the channel with an application cache
    // reported by the channel child.  Dropping it here may be too early.
    appCacheChan->SetInheritApplicationCache(false);
    if (!appCacheClientID.IsEmpty()) {
      nsCOMPtr<nsIApplicationCache> appCache;
      rv = appCacheService->GetApplicationCache(appCacheClientID,
                                                getter_AddRefs(appCache));
      if (NS_SUCCEEDED(rv)) {
        appCacheChan->SetApplicationCache(appCache);
        setChooseApplicationCache = false;
      }
    }

    if (setChooseApplicationCache) {
      OriginAttributes attrs;
      if (mLoadContext) {
        attrs.CopyFromLoadContext(mLoadContext);
      }

      nsCOMPtr<nsIPrincipal> principal =
        BasePrincipal::CreateCodebasePrincipal(uri, attrs);

      bool chooseAppCache = false;
      // This works because we've already called SetNotificationCallbacks and
      // done mPBOverride logic by this point.
      chooseAppCache = NS_ShouldCheckAppCache(principal, NS_UsePrivateBrowsing(mChannel));

      appCacheChan->SetChooseApplicationCache(chooseAppCache);
    }
  }

  nsID schedulingContextID;
  schedulingContextID.Parse(aSchedulingContextID.BeginReading());
  mChannel->SetSchedulingContextID(schedulingContextID);

  if (loadInfo && loadInfo->GetEnforceSecurity()) {
    rv = mChannel->AsyncOpen2(mParentListener);
  }
  else {
    rv = mChannel->AsyncOpen(mParentListener, nullptr);
  }
  if (NS_FAILED(rv))
    return SendFailedAsyncOpen(rv);

  return true;
}

bool
HttpChannelParent::ConnectChannel(const uint32_t& channelId, const bool& shouldIntercept)
{
  nsresult rv;

  LOG(("HttpChannelParent::ConnectChannel: Looking for a registered channel "
       "[this=%p, id=%lu]\n", this, channelId));
  nsCOMPtr<nsIChannel> channel;
  rv = NS_LinkRedirectChannels(channelId, this, getter_AddRefs(channel));
  mChannel = static_cast<nsHttpChannel*>(channel.get());
  LOG(("  found channel %p, rv=%08x", mChannel.get(), rv));

  mShouldIntercept = shouldIntercept;
  if (mShouldIntercept) {
    // When an interception occurs, this channel should suspend all further activity.
    // It will be torn down and recreated if necessary.
    mShouldSuspendIntercept = true;
  }

  if (mPBOverride != kPBOverride_Unset) {
    // redirected-to channel may not support PB
    nsCOMPtr<nsIPrivateBrowsingChannel> pbChannel = do_QueryObject(mChannel);
    if (pbChannel) {
      pbChannel->SetPrivate(mPBOverride == kPBOverride_Private ? true : false);
    }
  }

  bool appOffline = false;
  uint32_t appId = GetAppId();
  if (appId != NECKO_UNKNOWN_APP_ID &&
      appId != NECKO_NO_APP_ID) {
    gIOService->IsAppOffline(appId, &appOffline);
  }

  if (appOffline) {
    uint32_t loadFlags;
    mChannel->GetLoadFlags(&loadFlags);
    loadFlags |= nsICachingChannel::LOAD_ONLY_FROM_CACHE;
    loadFlags |= nsIRequest::LOAD_FROM_CACHE;
    loadFlags |= nsICachingChannel::LOAD_NO_NETWORK_IO;
    mChannel->SetLoadFlags(loadFlags);
  }

  return true;
}

bool
HttpChannelParent::RecvSetPriority(const uint16_t& priority)
{
  LOG(("HttpChannelParent::RecvSetPriority [this=%p, priority=%u]\n",
       this, priority));

  if (mChannel) {
    mChannel->SetPriority(priority);
  }

  nsCOMPtr<nsISupportsPriority> priorityRedirectChannel =
      do_QueryInterface(mRedirectChannel);
  if (priorityRedirectChannel)
    priorityRedirectChannel->SetPriority(priority);

  return true;
}

bool
HttpChannelParent::RecvSetClassOfService(const uint32_t& cos)
{
  if (mChannel) {
    mChannel->SetClassFlags(cos);
  }
  return true;
}

bool
HttpChannelParent::RecvSuspend()
{
  LOG(("HttpChannelParent::RecvSuspend [this=%p]\n", this));

  if (mChannel) {
    mChannel->Suspend();
  }
  return true;
}

bool
HttpChannelParent::RecvResume()
{
  LOG(("HttpChannelParent::RecvResume [this=%p]\n", this));

  if (mChannel) {
    mChannel->Resume();
  }
  return true;
}

bool
HttpChannelParent::RecvCancel(const nsresult& status)
{
  LOG(("HttpChannelParent::RecvCancel [this=%p]\n", this));

  // May receive cancel before channel has been constructed!
  if (mChannel) {
    mChannel->Cancel(status);
  }
  return true;
}


bool
HttpChannelParent::RecvSetCacheTokenCachedCharset(const nsCString& charset)
{
  if (mCacheEntry)
    mCacheEntry->SetMetaDataElement("charset", charset.get());
  return true;
}

bool
HttpChannelParent::RecvUpdateAssociatedContentSecurity(const int32_t& broken,
                                                       const int32_t& no)
{
  if (mAssociatedContentSecurity) {
    mAssociatedContentSecurity->SetCountSubRequestsBrokenSecurity(broken);
    mAssociatedContentSecurity->SetCountSubRequestsNoSecurity(no);
  }
  return true;
}

bool
HttpChannelParent::RecvRedirect2Verify(const nsresult& result,
                                       const RequestHeaderTuples& changedHeaders,
                                       const uint32_t& loadFlags,
                                       const OptionalURIParams&   aAPIRedirectURI)
{
  LOG(("HttpChannelParent::RecvRedirect2Verify [this=%p result=%x]\n",
       this, result));
  if (NS_SUCCEEDED(result)) {
    nsCOMPtr<nsIHttpChannel> newHttpChannel =
        do_QueryInterface(mRedirectChannel);

    if (newHttpChannel) {
      nsCOMPtr<nsIURI> apiRedirectUri = DeserializeURI(aAPIRedirectURI);

      if (apiRedirectUri)
        newHttpChannel->RedirectTo(apiRedirectUri);

      for (uint32_t i = 0; i < changedHeaders.Length(); i++) {
        if (changedHeaders[i].mEmpty) {
          newHttpChannel->SetEmptyRequestHeader(changedHeaders[i].mHeader);
        } else {
          newHttpChannel->SetRequestHeader(changedHeaders[i].mHeader,
                                           changedHeaders[i].mValue,
                                           changedHeaders[i].mMerge);
        }
      }

      // A successfully redirected channel must have the LOAD_REPLACE flag.
      MOZ_ASSERT(loadFlags & nsIChannel::LOAD_REPLACE);
      if (loadFlags & nsIChannel::LOAD_REPLACE) {
        newHttpChannel->SetLoadFlags(loadFlags);
      }
    }
  }

  if (!mRedirectCallback) {
    // This should according the logic never happen, log the situation.
    if (mReceivedRedirect2Verify)
      LOG(("RecvRedirect2Verify[%p]: Duplicate fire", this));
    if (mSentRedirect1BeginFailed)
      LOG(("RecvRedirect2Verify[%p]: Send to child failed", this));
    if (mSentRedirect1Begin && NS_FAILED(result))
      LOG(("RecvRedirect2Verify[%p]: Redirect failed", this));
    if (mSentRedirect1Begin && NS_SUCCEEDED(result))
      LOG(("RecvRedirect2Verify[%p]: Redirect succeeded", this));
    if (!mRedirectChannel)
      LOG(("RecvRedirect2Verify[%p]: Missing redirect channel", this));

    NS_ERROR("Unexpcted call to HttpChannelParent::RecvRedirect2Verify, "
             "mRedirectCallback null");
  }

  mReceivedRedirect2Verify = true;

  if (mRedirectCallback) {
    LOG(("HttpChannelParent::RecvRedirect2Verify call OnRedirectVerifyCallback"
         " [this=%p result=%x, mRedirectCallback=%p]\n",
         this, result, mRedirectCallback.get()));
    mRedirectCallback->OnRedirectVerifyCallback(result);
    mRedirectCallback = nullptr;
  }

  return true;
}

bool
HttpChannelParent::RecvDocumentChannelCleanup()
{
  // From now on only using mAssociatedContentSecurity.  Free everything else.
  mChannel = 0;          // Reclaim some memory sooner.
  mCacheEntry = 0;  // Else we'll block other channels reading same URI
  return true;
}

bool
HttpChannelParent::RecvMarkOfflineCacheEntryAsForeign()
{
  if (mOfflineForeignMarker) {
    mOfflineForeignMarker->MarkAsForeign();
    mOfflineForeignMarker = 0;
  }

  return true;
}

class DivertDataAvailableEvent : public ChannelEvent
{
public:
  DivertDataAvailableEvent(HttpChannelParent* aParent,
                           const nsCString& data,
                           const uint64_t& offset,
                           const uint32_t& count)
  : mParent(aParent)
  , mData(data)
  , mOffset(offset)
  , mCount(count)
  {
  }

  void Run()
  {
    mParent->DivertOnDataAvailable(mData, mOffset, mCount);
  }

private:
  HttpChannelParent* mParent;
  nsCString mData;
  uint64_t mOffset;
  uint32_t mCount;
};

bool
HttpChannelParent::RecvDivertOnDataAvailable(const nsCString& data,
                                             const uint64_t& offset,
                                             const uint32_t& count)
{
  LOG(("HttpChannelParent::RecvDivertOnDataAvailable [this=%p]\n", this));

  MOZ_ASSERT(mParentListener);
  if (NS_WARN_IF(!mDivertingFromChild)) {
    MOZ_ASSERT(mDivertingFromChild,
               "Cannot RecvDivertOnDataAvailable if diverting is not set!");
    FailDiversion(NS_ERROR_UNEXPECTED);
    return false;
  }

  // Drop OnDataAvailables if the parent was canceled already.
  if (NS_FAILED(mStatus)) {
    return true;
  }

  if (mEventQ->ShouldEnqueue()) {
    mEventQ->Enqueue(new DivertDataAvailableEvent(this, data, offset, count));
    return true;
  }

  DivertOnDataAvailable(data, offset, count);
  return true;
}

void
HttpChannelParent::DivertOnDataAvailable(const nsCString& data,
                                         const uint64_t& offset,
                                         const uint32_t& count)
{
  LOG(("HttpChannelParent::DivertOnDataAvailable [this=%p]\n", this));

  MOZ_ASSERT(mParentListener);
  if (NS_WARN_IF(!mDivertingFromChild)) {
    MOZ_ASSERT(mDivertingFromChild,
               "Cannot DivertOnDataAvailable if diverting is not set!");
    FailDiversion(NS_ERROR_UNEXPECTED);
    return;
  }

  // Drop OnDataAvailables if the parent was canceled already.
  if (NS_FAILED(mStatus)) {
    return;
  }

  nsCOMPtr<nsIInputStream> stringStream;
  nsresult rv = NS_NewByteInputStream(getter_AddRefs(stringStream), data.get(),
                                      count, NS_ASSIGNMENT_DEPEND);
  if (NS_FAILED(rv)) {
    if (mChannel) {
      mChannel->Cancel(rv);
    }
    mStatus = rv;
    return;
  }

  AutoEventEnqueuer ensureSerialDispatch(mEventQ);

  rv = mParentListener->OnDataAvailable(mChannel, nullptr, stringStream,
                                        offset, count);
  stringStream->Close();
  if (NS_FAILED(rv)) {
    if (mChannel) {
      mChannel->Cancel(rv);
    }
    mStatus = rv;
  }
}

class DivertStopRequestEvent : public ChannelEvent
{
public:
  DivertStopRequestEvent(HttpChannelParent* aParent,
                         const nsresult& statusCode)
  : mParent(aParent)
  , mStatusCode(statusCode)
  {
  }

  void Run() {
    mParent->DivertOnStopRequest(mStatusCode);
  }

private:
  HttpChannelParent* mParent;
  nsresult mStatusCode;
};

bool
HttpChannelParent::RecvDivertOnStopRequest(const nsresult& statusCode)
{
  LOG(("HttpChannelParent::RecvDivertOnStopRequest [this=%p]\n", this));

  MOZ_ASSERT(mParentListener);
  if (NS_WARN_IF(!mDivertingFromChild)) {
    MOZ_ASSERT(mDivertingFromChild,
               "Cannot RecvDivertOnStopRequest if diverting is not set!");
    FailDiversion(NS_ERROR_UNEXPECTED);
    return false;
  }

  if (mEventQ->ShouldEnqueue()) {
    mEventQ->Enqueue(new DivertStopRequestEvent(this, statusCode));
    return true;
  }

  DivertOnStopRequest(statusCode);
  return true;
}

void
HttpChannelParent::DivertOnStopRequest(const nsresult& statusCode)
{
  LOG(("HttpChannelParent::DivertOnStopRequest [this=%p]\n", this));

  MOZ_ASSERT(mParentListener);
  if (NS_WARN_IF(!mDivertingFromChild)) {
    MOZ_ASSERT(mDivertingFromChild,
               "Cannot DivertOnStopRequest if diverting is not set!");
    FailDiversion(NS_ERROR_UNEXPECTED);
    return;
  }

  // Honor the channel's status even if the underlying transaction completed.
  nsresult status = NS_FAILED(mStatus) ? mStatus : statusCode;

  // Reset fake pending status in case OnStopRequest has already been called.
  if (mChannel) {
    mChannel->ForcePending(false);
  }

  AutoEventEnqueuer ensureSerialDispatch(mEventQ);
  mParentListener->OnStopRequest(mChannel, nullptr, status);
}

class DivertCompleteEvent : public ChannelEvent
{
public:
  explicit DivertCompleteEvent(HttpChannelParent* aParent)
  : mParent(aParent)
  {
  }

  void Run() {
    mParent->DivertComplete();
  }

private:
  HttpChannelParent* mParent;
};

bool
HttpChannelParent::RecvDivertComplete()
{
  LOG(("HttpChannelParent::RecvDivertComplete [this=%p]\n", this));

  MOZ_ASSERT(mParentListener);
  if (NS_WARN_IF(!mDivertingFromChild)) {
    MOZ_ASSERT(mDivertingFromChild,
               "Cannot RecvDivertComplete if diverting is not set!");
    FailDiversion(NS_ERROR_UNEXPECTED);
    return false;
  }

  if (mEventQ->ShouldEnqueue()) {
    mEventQ->Enqueue(new DivertCompleteEvent(this));
    return true;
  }

  DivertComplete();
  return true;
}

void
HttpChannelParent::DivertComplete()
{
  LOG(("HttpChannelParent::DivertComplete [this=%p]\n", this));

  MOZ_ASSERT(mParentListener);
  if (NS_WARN_IF(!mDivertingFromChild)) {
    MOZ_ASSERT(mDivertingFromChild,
               "Cannot DivertComplete if diverting is not set!");
    FailDiversion(NS_ERROR_UNEXPECTED);
    return;
  }

  nsresult rv = ResumeForDiversion();
  if (NS_WARN_IF(NS_FAILED(rv))) {
    FailDiversion(NS_ERROR_UNEXPECTED);
    return;
  }

  mParentListener = nullptr;
}

bool
HttpChannelParent::RecvRemoveCorsPreflightCacheEntry(const URIParams& uri,
  const mozilla::ipc::PrincipalInfo& requestingPrincipal)
{
  nsCOMPtr<nsIURI> deserializedURI = DeserializeURI(uri);
  if (!deserializedURI) {
    return false;
  }
  nsCOMPtr<nsIPrincipal> principal =
    PrincipalInfoToPrincipal(requestingPrincipal);
  if (!principal) {
    return false;
  }
  nsCORSListenerProxy::RemoveFromCorsPreflightCache(deserializedURI,
                                                    principal);
  return true;
}

//-----------------------------------------------------------------------------
// HttpChannelParent::nsIPackagedAppChannelListener
//-----------------------------------------------------------------------------

NS_IMETHODIMP
HttpChannelParent::OnStartSignedPackageRequest(const nsACString& aPackageId)
{
  if (mTabParent) {
    mTabParent->OnStartSignedPackageRequest(mChannel, aPackageId);
  }
  return NS_OK;
}

//-----------------------------------------------------------------------------
// HttpChannelParent::nsIRequestObserver
//-----------------------------------------------------------------------------

NS_IMETHODIMP
HttpChannelParent::OnStartRequest(nsIRequest *aRequest, nsISupports *aContext)
{
  LOG(("HttpChannelParent::OnStartRequest [this=%p, aRequest=%p]\n",
       this, aRequest));

  MOZ_RELEASE_ASSERT(!mDivertingFromChild,
    "Cannot call OnStartRequest if diverting is set!");

  nsHttpChannel *chan = static_cast<nsHttpChannel *>(aRequest);
  nsHttpResponseHead *responseHead = chan->GetResponseHead();
  nsHttpRequestHead  *requestHead = chan->GetRequestHead();
  bool isFromCache = false;
  chan->IsFromCache(&isFromCache);
  uint32_t expirationTime = nsICacheEntry::NO_EXPIRATION_TIME;
  chan->GetCacheTokenExpirationTime(&expirationTime);
  nsCString cachedCharset;
  chan->GetCacheTokenCachedCharset(cachedCharset);

  bool loadedFromApplicationCache;
  chan->GetLoadedFromApplicationCache(&loadedFromApplicationCache);
  if (loadedFromApplicationCache) {
    mOfflineForeignMarker = chan->GetOfflineCacheEntryAsForeignMarker();
    nsCOMPtr<nsIApplicationCache> appCache;
    chan->GetApplicationCache(getter_AddRefs(appCache));
    nsCString appCacheGroupId;
    nsCString appCacheClientId;
    appCache->GetGroupID(appCacheGroupId);
    appCache->GetClientID(appCacheClientId);
    if (mIPCClosed ||
        !SendAssociateApplicationCache(appCacheGroupId, appCacheClientId))
    {
      return NS_ERROR_UNEXPECTED;
    }
  }

  nsCOMPtr<nsIEncodedChannel> encodedChannel = do_QueryInterface(aRequest);
  if (encodedChannel)
    encodedChannel->SetApplyConversion(false);

  // Keep the cache entry for future use in RecvSetCacheTokenCachedCharset().
  // It could be already released by nsHttpChannel at that time.
  nsCOMPtr<nsISupports> cacheEntry;
  chan->GetCacheToken(getter_AddRefs(cacheEntry));
  mCacheEntry = do_QueryInterface(cacheEntry);

  nsresult channelStatus = NS_OK;
  chan->GetStatus(&channelStatus);

  nsCString secInfoSerialization;
  UpdateAndSerializeSecurityInfo(secInfoSerialization);

  uint16_t redirectCount = 0;
  mChannel->GetRedirectCount(&redirectCount);

  nsCOMPtr<nsISupports> cacheKey;
  mChannel->GetCacheKey(getter_AddRefs(cacheKey));
  uint32_t cacheKeyValue = 0;
  if (cacheKey) {
    nsCOMPtr<nsISupportsPRUint32> container = do_QueryInterface(cacheKey);
    if (!container) {
      return NS_ERROR_ILLEGAL_VALUE;
    }

    nsresult rv = container->GetData(&cacheKeyValue);
    if (NS_FAILED(rv)) {
      return rv;
    }
  }

  if (mIPCClosed ||
      !SendOnStartRequest(channelStatus,
                          responseHead ? *responseHead : nsHttpResponseHead(),
                          !!responseHead,
                          requestHead->Headers(),
                          isFromCache,
                          mCacheEntry ? true : false,
                          expirationTime, cachedCharset, secInfoSerialization,
                          mChannel->GetSelfAddr(), mChannel->GetPeerAddr(),
                          redirectCount,
                          cacheKeyValue))
  {
    return NS_ERROR_UNEXPECTED;
  }
  return NS_OK;
}

NS_IMETHODIMP
HttpChannelParent::OnStopRequest(nsIRequest *aRequest,
                                 nsISupports *aContext,
                                 nsresult aStatusCode)
{
  LOG(("HttpChannelParent::OnStopRequest: [this=%p aRequest=%p status=%x]\n",
       this, aRequest, aStatusCode));

  MOZ_RELEASE_ASSERT(!mDivertingFromChild,
    "Cannot call OnStopRequest if diverting is set!");
  ResourceTimingStruct timing;
  mChannel->GetDomainLookupStart(&timing.domainLookupStart);
  mChannel->GetDomainLookupEnd(&timing.domainLookupEnd);
  mChannel->GetConnectStart(&timing.connectStart);
  mChannel->GetConnectEnd(&timing.connectEnd);
  mChannel->GetRequestStart(&timing.requestStart);
  mChannel->GetResponseStart(&timing.responseStart);
  mChannel->GetResponseEnd(&timing.responseEnd);
  mChannel->GetAsyncOpen(&timing.fetchStart);
  mChannel->GetRedirectStart(&timing.redirectStart);
  mChannel->GetRedirectEnd(&timing.redirectEnd);
  mChannel->GetTransferSize(&timing.transferSize);
  mChannel->GetEncodedBodySize(&timing.encodedBodySize);
  // decodedBodySize can be computed in the child process so it doesn't need
  // to be passed down.
  mChannel->GetProtocolVersion(timing.protocolVersion);

  if (mIPCClosed || !SendOnStopRequest(aStatusCode, timing))
    return NS_ERROR_UNEXPECTED;
  return NS_OK;
}

//-----------------------------------------------------------------------------
// HttpChannelParent::nsIStreamListener
//-----------------------------------------------------------------------------

NS_IMETHODIMP
HttpChannelParent::OnDataAvailable(nsIRequest *aRequest,
                                   nsISupports *aContext,
                                   nsIInputStream *aInputStream,
                                   uint64_t aOffset,
                                   uint32_t aCount)
{
  LOG(("HttpChannelParent::OnDataAvailable [this=%p aRequest=%p]\n",
       this, aRequest));

  MOZ_RELEASE_ASSERT(!mDivertingFromChild,
    "Cannot call OnDataAvailable if diverting is set!");

  nsCString data;
  nsresult rv = NS_ReadInputStreamToString(aInputStream, data, aCount);
  if (NS_FAILED(rv))
    return rv;

  nsresult channelStatus = NS_OK;
  mChannel->GetStatus(&channelStatus);

  // OnDataAvailable is always preceded by OnStatus/OnProgress calls that set
  // mStoredStatus/mStoredProgress(Max) to appropriate values, unless
  // LOAD_BACKGROUND set.  In that case, they'll have garbage values, but
  // child doesn't use them.
  if (mIPCClosed || !SendOnTransportAndData(channelStatus, mStoredStatus,
                                            mStoredProgress, mStoredProgressMax,
                                            data, aOffset, aCount)) {
    return NS_ERROR_UNEXPECTED;
  }
  return NS_OK;
}

//-----------------------------------------------------------------------------
// HttpChannelParent::nsIProgressEventSink
//-----------------------------------------------------------------------------

NS_IMETHODIMP
HttpChannelParent::OnProgress(nsIRequest *aRequest,
                              nsISupports *aContext,
                              int64_t aProgress,
                              int64_t aProgressMax)
{
  // OnStatus has always just set mStoredStatus. If it indicates this precedes
  // OnDataAvailable, store and ODA will send to child.
  if (mStoredStatus == NS_NET_STATUS_RECEIVING_FROM ||
      mStoredStatus == NS_NET_STATUS_READING)
  {
    mStoredProgress = aProgress;
    mStoredProgressMax = aProgressMax;
  } else {
    // Send OnProgress events to the child for data upload progress notifications
    // (i.e. status == NS_NET_STATUS_SENDING_TO) or if the channel has
    // LOAD_BACKGROUND set.
    if (mIPCClosed || !SendOnProgress(aProgress, aProgressMax))
      return NS_ERROR_UNEXPECTED;
  }

  return NS_OK;
}

NS_IMETHODIMP
HttpChannelParent::OnStatus(nsIRequest *aRequest,
                            nsISupports *aContext,
                            nsresult aStatus,
                            const char16_t *aStatusArg)
{
  // If this precedes OnDataAvailable, store and ODA will send to child.
  if (aStatus == NS_NET_STATUS_RECEIVING_FROM ||
      aStatus == NS_NET_STATUS_READING)
  {
    mStoredStatus = aStatus;
    return NS_OK;
  }
  // Otherwise, send to child now
  if (mIPCClosed || !SendOnStatus(aStatus))
    return NS_ERROR_UNEXPECTED;
  return NS_OK;
}

//-----------------------------------------------------------------------------
// HttpChannelParent::nsIParentChannel
//-----------------------------------------------------------------------------

NS_IMETHODIMP
HttpChannelParent::SetParentListener(HttpChannelParentListener* aListener)
{
  LOG(("HttpChannelParent::SetParentListener [this=%p aListener=%p]\n",
       this, aListener));
  MOZ_ASSERT(aListener);
  MOZ_ASSERT(!mParentListener, "SetParentListener should only be called for "
                               "new HttpChannelParents after a redirect, when "
                               "mParentListener is null.");
  mParentListener = aListener;
  return NS_OK;
}

NS_IMETHODIMP
HttpChannelParent::NotifyTrackingProtectionDisabled()
{
  if (!mIPCClosed)
    Unused << SendNotifyTrackingProtectionDisabled();
  return NS_OK;
}

NS_IMETHODIMP
HttpChannelParent::Delete()
{
  if (!mIPCClosed)
    Unused << SendDeleteSelf();

  return NS_OK;
}

//-----------------------------------------------------------------------------
// HttpChannelParent::nsIParentRedirectingChannel
//-----------------------------------------------------------------------------

NS_IMETHODIMP
HttpChannelParent::StartRedirect(uint32_t newChannelId,
                                 nsIChannel* newChannel,
                                 uint32_t redirectFlags,
                                 nsIAsyncVerifyRedirectCallback* callback)
{
  LOG(("HttpChannelParent::StartRedirect [this=%p, newChannelId=%lu "
       "newChannel=%p callback=%p]\n", this, newChannelId, newChannel,
       callback));

  if (mIPCClosed)
    return NS_BINDING_ABORTED;

  nsCOMPtr<nsIURI> newURI;
  newChannel->GetURI(getter_AddRefs(newURI));

  URIParams uriParams;
  SerializeURI(newURI, uriParams);

  nsCString secInfoSerialization;
  UpdateAndSerializeSecurityInfo(secInfoSerialization);

  nsHttpResponseHead *responseHead = mChannel->GetResponseHead();
  bool result = SendRedirect1Begin(newChannelId, uriParams, redirectFlags,
                                   responseHead ? *responseHead
                                                : nsHttpResponseHead(),
                                   secInfoSerialization);
  if (!result) {
    // Bug 621446 investigation
    mSentRedirect1BeginFailed = true;
    return NS_BINDING_ABORTED;
  }

  // Bug 621446 investigation
  mSentRedirect1Begin = true;

  // Result is handled in RecvRedirect2Verify above

  mRedirectChannel = newChannel;
  mRedirectCallback = callback;
  return NS_OK;
}

NS_IMETHODIMP
HttpChannelParent::CompleteRedirect(bool succeeded)
{
  LOG(("HttpChannelParent::CompleteRedirect [this=%p succeeded=%d]\n",
       this, succeeded));

  if (succeeded && !mIPCClosed) {
    // TODO: check return value: assume child dead if failed
    Unused << SendRedirect3Complete();
  }

  mRedirectChannel = nullptr;
  return NS_OK;
}

//-----------------------------------------------------------------------------
// HttpChannelParent::ADivertableParentChannel
//-----------------------------------------------------------------------------
nsresult
HttpChannelParent::SuspendForDiversion()
{
  LOG(("HttpChannelParent::SuspendForDiversion [this=%p]\n", this));
  MOZ_ASSERT(mChannel);
  MOZ_ASSERT(mParentListener);
  if (NS_WARN_IF(mDivertingFromChild)) {
    MOZ_ASSERT(!mDivertingFromChild, "Already suspended for diversion!");
    return NS_ERROR_UNEXPECTED;
  }

  // Try suspending the channel. Allow it to fail, since OnStopRequest may have
  // been called and thus the channel may not be pending.
  nsresult rv = mChannel->Suspend();
  MOZ_ASSERT(NS_SUCCEEDED(rv) || rv == NS_ERROR_NOT_AVAILABLE);
  mSuspendedForDiversion = NS_SUCCEEDED(rv);

  rv = mParentListener->SuspendForDiversion();
  MOZ_ASSERT(NS_SUCCEEDED(rv));

  // Once this is set, no more OnStart/OnData/OnStop callbacks should be sent
  // to the child.
  mDivertingFromChild = true;

  return NS_OK;
}

/* private, supporting function for ADivertableParentChannel */
nsresult
HttpChannelParent::ResumeForDiversion()
{
  LOG(("HttpChannelParent::ResumeForDiversion [this=%p]\n", this));
  MOZ_ASSERT(mChannel);
  if (NS_WARN_IF(!mDivertingFromChild)) {
    MOZ_ASSERT(mDivertingFromChild,
               "Cannot ResumeForDiversion if not diverting!");
    return NS_ERROR_UNEXPECTED;
  }

  if (mSuspendedForDiversion) {
    // The nsHttpChannel will deliver remaining OnData/OnStop for the transfer.
    nsresult rv = mChannel->Resume();
    if (NS_WARN_IF(NS_FAILED(rv))) {
      FailDiversion(NS_ERROR_UNEXPECTED, true);
      return rv;
    }
    mSuspendedForDiversion = false;
  }

  if (NS_WARN_IF(mIPCClosed || !SendDeleteSelf())) {
    FailDiversion(NS_ERROR_UNEXPECTED);
    return NS_ERROR_UNEXPECTED;
  }
  return NS_OK;
}

void
HttpChannelParent::DivertTo(nsIStreamListener *aListener)
{
  LOG(("HttpChannelParent::DivertTo [this=%p aListener=%p]\n",
       this, aListener));
  MOZ_ASSERT(mParentListener);
  if (NS_WARN_IF(!mDivertingFromChild)) {
    MOZ_ASSERT(mDivertingFromChild,
               "Cannot DivertTo new listener if diverting is not set!");
    return;
  }

  mDivertListener = aListener;

  // Call OnStartRequest and SendDivertMessages asynchronously to avoid
  // reentering client context.
  NS_DispatchToCurrentThread(
    NS_NewRunnableMethod(this, &HttpChannelParent::StartDiversion));
  return;
}

void
HttpChannelParent::StartDiversion()
{
  LOG(("HttpChannelParent::StartDiversion [this=%p]\n", this));
  if (NS_WARN_IF(!mDivertingFromChild)) {
    MOZ_ASSERT(mDivertingFromChild,
               "Cannot StartDiversion if diverting is not set!");
    return;
  }

  // Fake pending status in case OnStopRequest has already been called.
  if (mChannel) {
    mChannel->ForcePending(true);
  }

  {
    AutoEventEnqueuer ensureSerialDispatch(mEventQ);

    // Call OnStartRequest for the "DivertTo" listener.
    nsresult rv = mDivertListener->OnStartRequest(mChannel, nullptr);
    if (NS_FAILED(rv)) {
      if (mChannel) {
        mChannel->Cancel(rv);
      }
      mStatus = rv;
    }
  }
  mDivertedOnStartRequest = true;

  // After OnStartRequest has been called, setup content decoders if needed.
  //
  // Create a content conversion chain based on mDivertListener and update
  // mDivertListener.
  nsCOMPtr<nsIStreamListener> converterListener;
  mChannel->DoApplyContentConversions(mDivertListener,
                                      getter_AddRefs(converterListener));
  if (converterListener) {
    mDivertListener = converterListener.forget();
  }

  // Now mParentListener can be diverted to mDivertListener.
  DebugOnly<nsresult> rvdbg = mParentListener->DivertTo(mDivertListener);
  MOZ_ASSERT(NS_SUCCEEDED(rvdbg));
  mDivertListener = nullptr;

  if (NS_WARN_IF(mIPCClosed || !SendFlushedForDiversion())) {
    FailDiversion(NS_ERROR_UNEXPECTED);
    return;
  }

  // The listener chain should now be setup; tell HttpChannelChild to divert
  // the OnDataAvailables and OnStopRequest to this HttpChannelParent.
  if (NS_WARN_IF(mIPCClosed || !SendDivertMessages())) {
    FailDiversion(NS_ERROR_UNEXPECTED);
    return;
  }
}

class HTTPFailDiversionEvent : public nsRunnable
{
public:
  HTTPFailDiversionEvent(HttpChannelParent *aChannelParent,
                         nsresult aErrorCode,
                         bool aSkipResume)
    : mChannelParent(aChannelParent)
    , mErrorCode(aErrorCode)
    , mSkipResume(aSkipResume)
  {
    MOZ_RELEASE_ASSERT(aChannelParent);
    MOZ_RELEASE_ASSERT(NS_FAILED(aErrorCode));
  }
  NS_IMETHOD Run()
  {
    mChannelParent->NotifyDiversionFailed(mErrorCode, mSkipResume);
    return NS_OK;
  }
private:
  RefPtr<HttpChannelParent> mChannelParent;
  nsresult mErrorCode;
  bool mSkipResume;
};

void
HttpChannelParent::FailDiversion(nsresult aErrorCode,
                                 bool aSkipResume)
{
  MOZ_RELEASE_ASSERT(NS_FAILED(aErrorCode));
  MOZ_RELEASE_ASSERT(mDivertingFromChild);
  MOZ_RELEASE_ASSERT(mParentListener);
  MOZ_RELEASE_ASSERT(mChannel);

  NS_DispatchToCurrentThread(
    new HTTPFailDiversionEvent(this, aErrorCode, aSkipResume));
}

void
HttpChannelParent::NotifyDiversionFailed(nsresult aErrorCode,
                                         bool aSkipResume)
{
  LOG(("HttpChannelParent::NotifyDiversionFailed [this=%p aErrorCode=%x]\n",
       this, aErrorCode));
  MOZ_RELEASE_ASSERT(NS_FAILED(aErrorCode));
  MOZ_RELEASE_ASSERT(mDivertingFromChild);
  MOZ_RELEASE_ASSERT(mParentListener);
  MOZ_RELEASE_ASSERT(mChannel);

  mChannel->Cancel(aErrorCode);

  mChannel->ForcePending(false);

  bool isPending = false;
  nsresult rv = mChannel->IsPending(&isPending);
  MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));

  // Resume only if we suspended earlier.
  if (mSuspendedForDiversion) {
    mChannel->Resume();
  }
  // Channel has already sent OnStartRequest to the child, so ensure that we
  // call it here if it hasn't already been called.
  if (!mDivertedOnStartRequest) {
    mChannel->ForcePending(true);
    mParentListener->OnStartRequest(mChannel, nullptr);
    mChannel->ForcePending(false);
  }
  // If the channel is pending, it will call OnStopRequest itself; otherwise, do
  // it here.
  if (!isPending) {
    mParentListener->OnStopRequest(mChannel, nullptr, aErrorCode);
  }
  mParentListener = nullptr;
  mChannel = nullptr;

  if (!mIPCClosed) {
    Unused << SendDeleteSelf();
  }
}

void
HttpChannelParent::OfflineDisconnect()
{
  if (mChannel) {
    mChannel->Cancel(NS_ERROR_OFFLINE);
  }
  mStatus = NS_ERROR_OFFLINE;
}

uint32_t
HttpChannelParent::GetAppId()
{
  uint32_t appId = NECKO_UNKNOWN_APP_ID;
  if (mLoadContext) {
    mLoadContext->GetAppId(&appId);
  }
  return appId;
}

NS_IMETHODIMP
HttpChannelParent::GetAuthPrompt(uint32_t aPromptReason, const nsIID& iid,
                                 void** aResult)
{
  nsCOMPtr<nsIAuthPrompt2> prompt =
    new NeckoParent::NestedFrameAuthPrompt(Manager(), mNestedFrameId);
  prompt.forget(aResult);
  return NS_OK;
}

void
HttpChannelParent::UpdateAndSerializeSecurityInfo(nsACString& aSerializedSecurityInfoOut)
{
  nsCOMPtr<nsISupports> secInfoSupp;
  mChannel->GetSecurityInfo(getter_AddRefs(secInfoSupp));
  if (secInfoSupp) {
    mAssociatedContentSecurity = do_QueryInterface(secInfoSupp);
    nsCOMPtr<nsISerializable> secInfoSer = do_QueryInterface(secInfoSupp);
    if (secInfoSer) {
      NS_SerializeToString(secInfoSer, aSerializedSecurityInfoOut);
    }
  }
}

//-----------------------------------------------------------------------------
// HttpChannelSecurityWarningReporter
//-----------------------------------------------------------------------------

nsresult
HttpChannelParent::ReportSecurityMessage(const nsAString& aMessageTag,
                                         const nsAString& aMessageCategory)
{
  if (mIPCClosed ||
      NS_WARN_IF(!SendReportSecurityMessage(nsString(aMessageTag),
                                            nsString(aMessageCategory)))) {
    return NS_ERROR_UNEXPECTED;
  }
  return NS_OK;
}

NS_IMETHODIMP
HttpChannelParent::IssueWarning(uint32_t aWarning, bool aAsError)
{
  Unused << SendIssueDeprecationWarning(aWarning, aAsError);
  return NS_OK;
}

} // namespace net
} // namespace mozilla