Add m-esr52 at 52.6.0

1 files changed, 932 insertions, 0 deletions

diff --git a/netwerk/protocol/ftp/FTPChannelChild.cpp b/netwerk/protocol/ftp/FTPChannelChild.cpp
new file mode 100644
index 0000000000..f8284aae3c
--- /dev/null
+++ b/netwerk/protocol/ftp/FTPChannelChild.cpp
@@ -0,0 +1,932 @@
+/* -*- 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/. */
+
+#include "mozilla/net/NeckoChild.h"
+#include "mozilla/net/ChannelDiverterChild.h"
+#include "mozilla/net/FTPChannelChild.h"
+#include "mozilla/dom/TabChild.h"
+#include "nsFtpProtocolHandler.h"
+#include "nsITabChild.h"
+#include "nsStringStream.h"
+#include "nsNetUtil.h"
+#include "base/compiler_specific.h"
+#include "mozilla/ipc/InputStreamUtils.h"
+#include "mozilla/ipc/URIUtils.h"
+#include "SerializedLoadContext.h"
+#include "mozilla/ipc/BackgroundUtils.h"
+#include "nsIPrompt.h"
+
+using namespace mozilla::ipc;
+
+#undef LOG
+#define LOG(args) MOZ_LOG(gFTPLog, mozilla::LogLevel::Debug, args)
+
+namespace mozilla {
+namespace net {
+
+FTPChannelChild::FTPChannelChild(nsIURI* uri)
+: mIPCOpen(false)
+, mUnknownDecoderInvolved(false)
+, mCanceled(false)
+, mSuspendCount(0)
+, mIsPending(false)
+, mLastModifiedTime(0)
+, mStartPos(0)
+, mDivertingToParent(false)
+, mFlushedForDiversion(false)
+, mSuspendSent(false)
+{
+  LOG(("Creating FTPChannelChild @%x\n", this));
+  // grab a reference to the handler to ensure that it doesn't go away.
+  NS_ADDREF(gFtpHandler);
+  SetURI(uri);
+  mEventQ = new ChannelEventQueue(static_cast<nsIFTPChannel*>(this));
+
+  // We could support thread retargeting, but as long as we're being driven by
+  // IPDL on the main thread it doesn't buy us anything.
+  DisallowThreadRetargeting();
+}
+
+FTPChannelChild::~FTPChannelChild()
+{
+  LOG(("Destroying FTPChannelChild @%x\n", this));
+  gFtpHandler->Release();
+}
+
+void
+FTPChannelChild::AddIPDLReference()
+{
+  MOZ_ASSERT(!mIPCOpen, "Attempt to retain more than one IPDL reference");
+  mIPCOpen = true;
+  AddRef();
+}
+
+void
+FTPChannelChild::ReleaseIPDLReference()
+{
+  MOZ_ASSERT(mIPCOpen, "Attempt to release nonexistent IPDL reference");
+  mIPCOpen = false;
+  Release();
+}
+
+//-----------------------------------------------------------------------------
+// FTPChannelChild::nsISupports
+//-----------------------------------------------------------------------------
+
+NS_IMPL_ISUPPORTS_INHERITED(FTPChannelChild,
+                            nsBaseChannel,
+                            nsIFTPChannel,
+                            nsIUploadChannel,
+                            nsIResumableChannel,
+                            nsIProxiedChannel,
+                            nsIChildChannel,
+                            nsIDivertableChannel)
+
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+FTPChannelChild::GetLastModifiedTime(PRTime* lastModifiedTime)
+{
+  *lastModifiedTime = mLastModifiedTime;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+FTPChannelChild::SetLastModifiedTime(PRTime lastModifiedTime)
+{
+  return NS_ERROR_NOT_AVAILABLE;
+}
+
+NS_IMETHODIMP
+FTPChannelChild::ResumeAt(uint64_t aStartPos, const nsACString& aEntityID)
+{
+  NS_ENSURE_TRUE(!mIsPending, NS_ERROR_IN_PROGRESS);
+  mStartPos = aStartPos;
+  mEntityID = aEntityID;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+FTPChannelChild::GetEntityID(nsACString& entityID)
+{
+  entityID = mEntityID;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+FTPChannelChild::GetProxyInfo(nsIProxyInfo** aProxyInfo)
+{
+  DROP_DEAD();
+}
+
+NS_IMETHODIMP
+FTPChannelChild::SetUploadStream(nsIInputStream* stream,
+                                 const nsACString& contentType,
+                                 int64_t contentLength)
+{
+  NS_ENSURE_TRUE(!mIsPending, NS_ERROR_IN_PROGRESS);
+  mUploadStream = stream;
+  // NOTE: contentLength is intentionally ignored here.
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+FTPChannelChild::GetUploadStream(nsIInputStream** stream)
+{
+  NS_ENSURE_ARG_POINTER(stream);
+  *stream = mUploadStream;
+  NS_IF_ADDREF(*stream);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+FTPChannelChild::AsyncOpen(::nsIStreamListener* listener, nsISupports* aContext)
+{
+  LOG(("FTPChannelChild::AsyncOpen [this=%p]\n", this));
+
+  NS_ENSURE_TRUE((gNeckoChild), NS_ERROR_FAILURE);
+  NS_ENSURE_ARG_POINTER(listener);
+  NS_ENSURE_TRUE(!mIsPending, NS_ERROR_IN_PROGRESS);
+  NS_ENSURE_TRUE(!mWasOpened, NS_ERROR_ALREADY_OPENED);
+
+  // Port checked in parent, but duplicate here so we can return with error
+  // immediately, as we've done since before e10s.
+  nsresult rv;
+  rv = NS_CheckPortSafety(nsBaseChannel::URI()); // Need to disambiguate,
+                                                 // because in the child ipdl,
+                                                 // a typedef URI is defined...
+  if (NS_FAILED(rv))
+    return rv;
+
+  mozilla::dom::TabChild* tabChild = nullptr;
+  nsCOMPtr<nsITabChild> iTabChild;
+  NS_QueryNotificationCallbacks(mCallbacks, mLoadGroup,
+                                NS_GET_IID(nsITabChild),
+                                getter_AddRefs(iTabChild));
+  GetCallback(iTabChild);
+  if (iTabChild) {
+    tabChild = static_cast<mozilla::dom::TabChild*>(iTabChild.get());
+  }
+  if (MissingRequiredTabChild(tabChild, "ftp")) {
+    return NS_ERROR_ILLEGAL_VALUE;
+  }
+
+  mListener = listener;
+  mListenerContext = aContext;
+
+  // add ourselves to the load group. 
+  if (mLoadGroup)
+    mLoadGroup->AddRequest(this, nullptr);
+
+  OptionalInputStreamParams uploadStream;
+  nsTArray<mozilla::ipc::FileDescriptor> fds;
+  SerializeInputStream(mUploadStream, uploadStream, fds);
+
+  MOZ_ASSERT(fds.IsEmpty());
+
+  FTPChannelOpenArgs openArgs;
+  SerializeURI(nsBaseChannel::URI(), openArgs.uri());
+  openArgs.startPos() = mStartPos;
+  openArgs.entityID() = mEntityID;
+  openArgs.uploadStream() = uploadStream;
+
+  nsCOMPtr<nsILoadInfo> loadInfo;
+  GetLoadInfo(getter_AddRefs(loadInfo));
+  rv = mozilla::ipc::LoadInfoToLoadInfoArgs(loadInfo, &openArgs.loadInfo());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  gNeckoChild->
+    SendPFTPChannelConstructor(this, tabChild, IPC::SerializedLoadContext(this),
+                               openArgs);
+
+  // The socket transport layer in the chrome process now has a logical ref to
+  // us until OnStopRequest is called.
+  AddIPDLReference();
+
+  mIsPending = true;
+  mWasOpened = true;
+
+  return rv;
+}
+
+NS_IMETHODIMP
+FTPChannelChild::IsPending(bool* result)
+{
+  *result = mIsPending;
+  return NS_OK;
+}
+
+nsresult
+FTPChannelChild::OpenContentStream(bool async,
+                                   nsIInputStream** stream,
+                                   nsIChannel** channel)
+{
+  NS_RUNTIMEABORT("FTPChannel*Child* should never have OpenContentStream called!");
+  return NS_OK;
+}
+  
+//-----------------------------------------------------------------------------
+// FTPChannelChild::PFTPChannelChild
+//-----------------------------------------------------------------------------
+
+class FTPStartRequestEvent : public ChannelEvent
+{
+public:
+  FTPStartRequestEvent(FTPChannelChild* aChild,
+                       const nsresult& aChannelStatus,
+                       const int64_t& aContentLength,
+                       const nsCString& aContentType,
+                       const PRTime& aLastModified,
+                       const nsCString& aEntityID,
+                       const URIParams& aURI)
+    : mChild(aChild)
+    , mChannelStatus(aChannelStatus)
+    , mContentLength(aContentLength)
+    , mContentType(aContentType)
+    , mLastModified(aLastModified)
+    , mEntityID(aEntityID)
+    , mURI(aURI)
+  {
+  }
+  void Run()
+  {
+    mChild->DoOnStartRequest(mChannelStatus, mContentLength, mContentType,
+                             mLastModified, mEntityID, mURI);
+  }
+
+private:
+  FTPChannelChild* mChild;
+  nsresult mChannelStatus;
+  int64_t mContentLength;
+  nsCString mContentType;
+  PRTime mLastModified;
+  nsCString mEntityID;
+  URIParams mURI;
+};
+
+bool
+FTPChannelChild::RecvOnStartRequest(const nsresult& aChannelStatus,
+                                    const int64_t& aContentLength,
+                                    const nsCString& aContentType,
+                                    const PRTime& aLastModified,
+                                    const nsCString& aEntityID,
+                                    const URIParams& aURI)
+{
+  // mFlushedForDiversion and mDivertingToParent should NEVER be set at this
+  // stage, as they are set in the listener's OnStartRequest.
+  MOZ_RELEASE_ASSERT(!mFlushedForDiversion,
+    "mFlushedForDiversion should be unset before OnStartRequest!");
+  MOZ_RELEASE_ASSERT(!mDivertingToParent,
+    "mDivertingToParent should be unset before OnStartRequest!");
+
+  LOG(("FTPChannelChild::RecvOnStartRequest [this=%p]\n", this));
+
+  mEventQ->RunOrEnqueue(new FTPStartRequestEvent(this, aChannelStatus,
+                                                 aContentLength, aContentType,
+                                                 aLastModified, aEntityID,
+                                                 aURI));
+  return true;
+}
+
+void
+FTPChannelChild::DoOnStartRequest(const nsresult& aChannelStatus,
+                                  const int64_t& aContentLength,
+                                  const nsCString& aContentType,
+                                  const PRTime& aLastModified,
+                                  const nsCString& aEntityID,
+                                  const URIParams& aURI)
+{
+  LOG(("FTPChannelChild::DoOnStartRequest [this=%p]\n", this));
+
+  // mFlushedForDiversion and mDivertingToParent should NEVER be set at this
+  // stage, as they are set in the listener's OnStartRequest.
+  MOZ_RELEASE_ASSERT(!mFlushedForDiversion,
+    "mFlushedForDiversion should be unset before OnStartRequest!");
+  MOZ_RELEASE_ASSERT(!mDivertingToParent,
+    "mDivertingToParent should be unset before OnStartRequest!");
+
+  if (!mCanceled && NS_SUCCEEDED(mStatus)) {
+    mStatus = aChannelStatus;
+  }
+
+  mContentLength = aContentLength;
+  SetContentType(aContentType);
+  mLastModifiedTime = aLastModified;
+  mEntityID = aEntityID;
+
+  nsCString spec;
+  nsCOMPtr<nsIURI> uri = DeserializeURI(aURI);
+  nsresult rv = uri->GetSpec(spec);
+  if (NS_SUCCEEDED(rv)) {
+    rv = nsBaseChannel::URI()->SetSpec(spec);
+    if (NS_FAILED(rv)) {
+      Cancel(rv);
+    }
+  } else {
+    Cancel(rv);
+  }
+
+  AutoEventEnqueuer ensureSerialDispatch(mEventQ);
+  rv = mListener->OnStartRequest(this, mListenerContext);
+  if (NS_FAILED(rv))
+    Cancel(rv);
+
+  if (mDivertingToParent) {
+    mListener = nullptr;
+    mListenerContext = nullptr;
+    if (mLoadGroup) {
+      mLoadGroup->RemoveRequest(this, nullptr, mStatus);
+    }
+  }
+}
+
+class FTPDataAvailableEvent : public ChannelEvent
+{
+public:
+  FTPDataAvailableEvent(FTPChannelChild* aChild,
+                        const nsresult& aChannelStatus,
+                        const nsCString& aData,
+                        const uint64_t& aOffset,
+                        const uint32_t& aCount)
+    : mChild(aChild)
+    , mChannelStatus(aChannelStatus)
+    , mData(aData)
+    , mOffset(aOffset)
+    , mCount(aCount)
+  {
+  }
+  void Run()
+  {
+    mChild->DoOnDataAvailable(mChannelStatus, mData, mOffset, mCount);
+  }
+
+private:
+  FTPChannelChild* mChild;
+  nsresult mChannelStatus;
+  nsCString mData;
+  uint64_t mOffset;
+  uint32_t mCount;
+};
+
+bool
+FTPChannelChild::RecvOnDataAvailable(const nsresult& channelStatus,
+                                     const nsCString& data,
+                                     const uint64_t& offset,
+                                     const uint32_t& count)
+{
+  MOZ_RELEASE_ASSERT(!mFlushedForDiversion,
+                     "Should not be receiving any more callbacks from parent!");
+
+  LOG(("FTPChannelChild::RecvOnDataAvailable [this=%p]\n", this));
+
+  mEventQ->RunOrEnqueue(new FTPDataAvailableEvent(this, channelStatus, data,
+                                                  offset, count),
+                        mDivertingToParent);
+
+  return true;
+}
+
+class MaybeDivertOnDataFTPEvent : public ChannelEvent
+{
+ public:
+  MaybeDivertOnDataFTPEvent(FTPChannelChild* child,
+                            const nsCString& data,
+                            const uint64_t& offset,
+                            const uint32_t& count)
+  : mChild(child)
+  , mData(data)
+  , mOffset(offset)
+  , mCount(count) {}
+
+  void Run()
+  {
+    mChild->MaybeDivertOnData(mData, mOffset, mCount);
+  }
+
+ private:
+  FTPChannelChild* mChild;
+  nsCString mData;
+  uint64_t mOffset;
+  uint32_t mCount;
+};
+
+void
+FTPChannelChild::MaybeDivertOnData(const nsCString& data,
+                                   const uint64_t& offset,
+                                   const uint32_t& count)
+{
+  if (mDivertingToParent) {
+    SendDivertOnDataAvailable(data, offset, count);
+  }
+}
+
+void
+FTPChannelChild::DoOnDataAvailable(const nsresult& channelStatus,
+                                   const nsCString& data,
+                                   const uint64_t& offset,
+                                   const uint32_t& count)
+{
+  LOG(("FTPChannelChild::DoOnDataAvailable [this=%p]\n", this));
+
+  if (!mCanceled && NS_SUCCEEDED(mStatus)) {
+    mStatus = channelStatus;
+  }
+
+  if (mDivertingToParent) {
+    MOZ_RELEASE_ASSERT(!mFlushedForDiversion,
+      "Should not be processing any more callbacks from parent!");
+
+    SendDivertOnDataAvailable(data, offset, count);
+    return;
+  }
+
+  if (mCanceled)
+    return;
+
+  if (mUnknownDecoderInvolved) {
+    mUnknownDecoderEventQ.AppendElement(
+      MakeUnique<MaybeDivertOnDataFTPEvent>(this, data, offset, count));
+  }
+
+  // NOTE: the OnDataAvailable contract requires the client to read all the data
+  // in the inputstream.  This code relies on that ('data' will go away after
+  // this function).  Apparently the previous, non-e10s behavior was to actually
+  // support only reading part of the data, allowing later calls to read the
+  // rest.
+  nsCOMPtr<nsIInputStream> stringStream;
+  nsresult rv = NS_NewByteInputStream(getter_AddRefs(stringStream),
+                                      data.get(),
+                                      count,
+                                      NS_ASSIGNMENT_DEPEND);
+  if (NS_FAILED(rv)) {
+    Cancel(rv);
+    return;
+  }
+
+  AutoEventEnqueuer ensureSerialDispatch(mEventQ);
+  rv = mListener->OnDataAvailable(this, mListenerContext,
+                                  stringStream, offset, count);
+  if (NS_FAILED(rv))
+    Cancel(rv);
+  stringStream->Close();
+}
+
+class FTPStopRequestEvent : public ChannelEvent
+{
+public:
+  FTPStopRequestEvent(FTPChannelChild* aChild,
+                      const nsresult& aChannelStatus,
+                      const nsCString &aErrorMsg,
+                      bool aUseUTF8)
+    : mChild(aChild)
+    , mChannelStatus(aChannelStatus)
+    , mErrorMsg(aErrorMsg)
+    , mUseUTF8(aUseUTF8)
+  {
+  }
+  void Run()
+  {
+    mChild->DoOnStopRequest(mChannelStatus, mErrorMsg, mUseUTF8);
+  }
+
+private:
+  FTPChannelChild* mChild;
+  nsresult mChannelStatus;
+  nsCString mErrorMsg;
+  bool mUseUTF8;
+};
+
+bool
+FTPChannelChild::RecvOnStopRequest(const nsresult& aChannelStatus,
+                                   const nsCString &aErrorMsg,
+                                   const bool &aUseUTF8)
+{
+  MOZ_RELEASE_ASSERT(!mFlushedForDiversion,
+    "Should not be receiving any more callbacks from parent!");
+
+  LOG(("FTPChannelChild::RecvOnStopRequest [this=%p status=%x]\n",
+       this, aChannelStatus));
+
+  mEventQ->RunOrEnqueue(new FTPStopRequestEvent(this, aChannelStatus, aErrorMsg,
+                                                aUseUTF8));
+  return true;
+}
+
+class nsFtpChildAsyncAlert : public Runnable
+{
+public:
+  nsFtpChildAsyncAlert(nsIPrompt *aPrompter, nsString aResponseMsg)
+    : mPrompter(aPrompter)
+    , mResponseMsg(aResponseMsg)
+  {
+    MOZ_COUNT_CTOR(nsFtpChildAsyncAlert);
+  }
+protected:
+  virtual ~nsFtpChildAsyncAlert()
+  {
+    MOZ_COUNT_DTOR(nsFtpChildAsyncAlert);
+  }
+public:
+  NS_IMETHOD Run() override
+  {
+    if (mPrompter) {
+      mPrompter->Alert(nullptr, mResponseMsg.get());
+    }
+    return NS_OK;
+  }
+private:
+  nsCOMPtr<nsIPrompt> mPrompter;
+  nsString mResponseMsg;
+};
+
+class MaybeDivertOnStopFTPEvent : public ChannelEvent
+{
+ public:
+  MaybeDivertOnStopFTPEvent(FTPChannelChild* child,
+                            const nsresult& aChannelStatus)
+  : mChild(child)
+  , mChannelStatus(aChannelStatus) {}
+
+  void Run()
+  {
+    mChild->MaybeDivertOnStop(mChannelStatus);
+  }
+
+ private:
+  FTPChannelChild* mChild;
+  nsresult mChannelStatus;
+};
+
+void
+FTPChannelChild::MaybeDivertOnStop(const nsresult& aChannelStatus)
+{
+  if (mDivertingToParent) {
+    SendDivertOnStopRequest(aChannelStatus);
+  }
+}
+
+void
+FTPChannelChild::DoOnStopRequest(const nsresult& aChannelStatus,
+                                 const nsCString &aErrorMsg,
+                                 bool aUseUTF8)
+{
+  LOG(("FTPChannelChild::DoOnStopRequest [this=%p status=%x]\n",
+       this, aChannelStatus));
+
+  if (mDivertingToParent) {
+    MOZ_RELEASE_ASSERT(!mFlushedForDiversion,
+      "Should not be processing any more callbacks from parent!");
+
+    SendDivertOnStopRequest(aChannelStatus);
+    return;
+  }
+
+  if (!mCanceled)
+    mStatus = aChannelStatus;
+
+  if (mUnknownDecoderInvolved) {
+    mUnknownDecoderEventQ.AppendElement(
+      MakeUnique<MaybeDivertOnStopFTPEvent>(this, aChannelStatus));
+  }
+
+  { // Ensure that all queued ipdl events are dispatched before
+    // we initiate protocol deletion below.
+    mIsPending = false;
+    AutoEventEnqueuer ensureSerialDispatch(mEventQ);
+    (void)mListener->OnStopRequest(this, mListenerContext, aChannelStatus);
+
+    if (NS_FAILED(aChannelStatus) && !aErrorMsg.IsEmpty()) {
+      nsCOMPtr<nsIPrompt> prompter;
+      GetCallback(prompter);
+      if (prompter) {
+        nsCOMPtr<nsIRunnable> alertEvent;
+        if (aUseUTF8) {
+          alertEvent = new nsFtpChildAsyncAlert(prompter,
+                             NS_ConvertUTF8toUTF16(aErrorMsg));
+        } else {
+          alertEvent = new nsFtpChildAsyncAlert(prompter,
+                             NS_ConvertASCIItoUTF16(aErrorMsg));
+        }
+        NS_DispatchToMainThread(alertEvent);
+      }
+    }
+
+    mListener = nullptr;
+    mListenerContext = nullptr;
+
+    if (mLoadGroup)
+      mLoadGroup->RemoveRequest(this, nullptr, aChannelStatus);
+  }
+
+  // This calls NeckoChild::DeallocPFTPChannelChild(), which deletes |this| if IPDL
+  // holds the last reference.  Don't rely on |this| existing after here!
+  Send__delete__(this);
+}
+
+class FTPFailedAsyncOpenEvent : public ChannelEvent
+{
+ public:
+  FTPFailedAsyncOpenEvent(FTPChannelChild* aChild, nsresult aStatus)
+  : mChild(aChild), mStatus(aStatus) {}
+  void Run() { mChild->DoFailedAsyncOpen(mStatus); }
+ private:
+  FTPChannelChild* mChild;
+  nsresult mStatus;
+};
+
+bool
+FTPChannelChild::RecvFailedAsyncOpen(const nsresult& statusCode)
+{
+  LOG(("FTPChannelChild::RecvFailedAsyncOpen [this=%p status=%x]\n",
+       this, statusCode));
+  mEventQ->RunOrEnqueue(new FTPFailedAsyncOpenEvent(this, statusCode));
+  return true;
+}
+
+void
+FTPChannelChild::DoFailedAsyncOpen(const nsresult& statusCode)
+{
+  LOG(("FTPChannelChild::DoFailedAsyncOpen [this=%p status=%x]\n",
+       this, statusCode));
+  mStatus = statusCode;
+
+  if (mLoadGroup)
+    mLoadGroup->RemoveRequest(this, nullptr, statusCode);
+
+  if (mListener) {
+    mListener->OnStartRequest(this, mListenerContext);
+    mIsPending = false;
+    mListener->OnStopRequest(this, mListenerContext, statusCode);
+  } else {
+    mIsPending = false;
+  }
+
+  mListener = nullptr;
+  mListenerContext = nullptr;
+
+  if (mIPCOpen)
+    Send__delete__(this);
+}
+
+class FTPFlushedForDiversionEvent : public ChannelEvent
+{
+ public:
+  explicit FTPFlushedForDiversionEvent(FTPChannelChild* aChild)
+  : mChild(aChild)
+  {
+    MOZ_RELEASE_ASSERT(aChild);
+  }
+
+  void Run()
+  {
+    mChild->FlushedForDiversion();
+  }
+ private:
+  FTPChannelChild* mChild;
+};
+
+bool
+FTPChannelChild::RecvFlushedForDiversion()
+{
+  LOG(("FTPChannelChild::RecvFlushedForDiversion [this=%p]\n", this));
+  MOZ_ASSERT(mDivertingToParent);
+
+  mEventQ->RunOrEnqueue(new FTPFlushedForDiversionEvent(this), true);
+  return true;
+}
+
+void
+FTPChannelChild::FlushedForDiversion()
+{
+  LOG(("FTPChannelChild::FlushedForDiversion [this=%p]\n", this));
+  MOZ_RELEASE_ASSERT(mDivertingToParent);
+
+  // Once this is set, it should not be unset before FTPChannelChild is taken
+  // down. After it is set, no OnStart/OnData/OnStop callbacks should be
+  // received from the parent channel, nor dequeued from the ChannelEventQueue.
+  mFlushedForDiversion = true;
+
+  SendDivertComplete();
+}
+
+bool
+FTPChannelChild::RecvDivertMessages()
+{
+  LOG(("FTPChannelChild::RecvDivertMessages [this=%p]\n", this));
+  MOZ_RELEASE_ASSERT(mDivertingToParent);
+  MOZ_RELEASE_ASSERT(mSuspendCount > 0);
+
+  // DivertTo() has been called on parent, so we can now start sending queued
+  // IPDL messages back to parent listener.
+  if (NS_WARN_IF(NS_FAILED(Resume()))) {
+    return false;
+  }
+  return true;
+}
+
+class FTPDeleteSelfEvent : public ChannelEvent
+{
+ public:
+  explicit FTPDeleteSelfEvent(FTPChannelChild* aChild)
+  : mChild(aChild) {}
+  void Run() { mChild->DoDeleteSelf(); }
+ private:
+  FTPChannelChild* mChild;
+};
+
+bool
+FTPChannelChild::RecvDeleteSelf()
+{
+  mEventQ->RunOrEnqueue(new FTPDeleteSelfEvent(this));
+  return true;
+}
+
+void
+FTPChannelChild::DoDeleteSelf()
+{
+  if (mIPCOpen)
+    Send__delete__(this);
+}
+
+NS_IMETHODIMP
+FTPChannelChild::Cancel(nsresult status)
+{
+  LOG(("FTPChannelChild::Cancel [this=%p]\n", this));
+  if (mCanceled)
+    return NS_OK;
+
+  mCanceled = true;
+  mStatus = status;
+  if (mIPCOpen)
+    SendCancel(status);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+FTPChannelChild::Suspend()
+{
+  NS_ENSURE_TRUE(mIPCOpen, NS_ERROR_NOT_AVAILABLE);
+
+  LOG(("FTPChannelChild::Suspend [this=%p]\n", this));
+
+  // SendSuspend only once, when suspend goes from 0 to 1.
+  // Don't SendSuspend at all if we're diverting callbacks to the parent;
+  // suspend will be called at the correct time in the parent itself.
+  if (!mSuspendCount++ && !mDivertingToParent) {
+    SendSuspend();
+    mSuspendSent = true;
+  }
+  mEventQ->Suspend();
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+FTPChannelChild::Resume()
+{
+  NS_ENSURE_TRUE(mIPCOpen, NS_ERROR_NOT_AVAILABLE);
+
+  LOG(("FTPChannelChild::Resume [this=%p]\n", this));
+
+  // SendResume only once, when suspend count drops to 0.
+  // Don't SendResume at all if we're diverting callbacks to the parent (unless
+  // suspend was sent earlier); otherwise, resume will be called at the correct
+  // time in the parent itself.
+  if (!--mSuspendCount && (!mDivertingToParent || mSuspendSent)) {
+    SendResume();
+  }
+  mEventQ->Resume();
+
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// FTPChannelChild::nsIChildChannel
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+FTPChannelChild::ConnectParent(uint32_t id)
+{
+  LOG(("FTPChannelChild::ConnectParent [this=%p]\n", this));
+
+  mozilla::dom::TabChild* tabChild = nullptr;
+  nsCOMPtr<nsITabChild> iTabChild;
+  NS_QueryNotificationCallbacks(mCallbacks, mLoadGroup,
+                                NS_GET_IID(nsITabChild),
+                                getter_AddRefs(iTabChild));
+  GetCallback(iTabChild);
+  if (iTabChild) {
+    tabChild = static_cast<mozilla::dom::TabChild*>(iTabChild.get());
+  }
+
+  // The socket transport in the chrome process now holds a logical ref to us
+  // until OnStopRequest, or we do a redirect, or we hit an IPDL error.
+  AddIPDLReference();
+
+  FTPChannelConnectArgs connectArgs(id);
+
+  if (!gNeckoChild->SendPFTPChannelConstructor(this, tabChild,
+                                               IPC::SerializedLoadContext(this),
+                                               connectArgs)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+FTPChannelChild::CompleteRedirectSetup(nsIStreamListener *listener,
+                                       nsISupports *aContext)
+{
+  LOG(("FTPChannelChild::CompleteRedirectSetup [this=%p]\n", this));
+
+  NS_ENSURE_TRUE(!mIsPending, NS_ERROR_IN_PROGRESS);
+  NS_ENSURE_TRUE(!mWasOpened, NS_ERROR_ALREADY_OPENED);
+
+  mIsPending = true;
+  mWasOpened = true;
+  mListener = listener;
+  mListenerContext = aContext;
+
+  // add ourselves to the load group.
+  if (mLoadGroup)
+    mLoadGroup->AddRequest(this, nullptr);
+
+  // We already have an open IPDL connection to the parent. If on-modify-request
+  // listeners or load group observers canceled us, let the parent handle it
+  // and send it back to us naturally.
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// FTPChannelChild::nsIDivertableChannel
+//-----------------------------------------------------------------------------
+NS_IMETHODIMP
+FTPChannelChild::DivertToParent(ChannelDiverterChild **aChild)
+{
+  MOZ_RELEASE_ASSERT(aChild);
+  MOZ_RELEASE_ASSERT(gNeckoChild);
+  MOZ_RELEASE_ASSERT(!mDivertingToParent);
+
+  LOG(("FTPChannelChild::DivertToParent [this=%p]\n", this));
+
+  // We must fail DivertToParent() if there's no parent end of the channel (and
+  // won't be!) due to early failure.
+  if (NS_FAILED(mStatus) && !mIPCOpen) {
+    return mStatus;
+  }
+
+  nsresult rv = Suspend();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  // Once this is set, it should not be unset before the child is taken down.
+  mDivertingToParent = true;
+
+  PChannelDiverterChild* diverter =
+    gNeckoChild->SendPChannelDiverterConstructor(this);
+  MOZ_RELEASE_ASSERT(diverter);
+
+  *aChild = static_cast<ChannelDiverterChild*>(diverter);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+FTPChannelChild::UnknownDecoderInvolvedKeepData()
+{
+  mUnknownDecoderInvolved = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+FTPChannelChild::UnknownDecoderInvolvedOnStartRequestCalled()
+{
+  mUnknownDecoderInvolved = false;
+
+  nsresult rv = NS_OK;
+
+  if (mDivertingToParent) {
+    rv = mEventQ->PrependEvents(mUnknownDecoderEventQ);
+  }
+  mUnknownDecoderEventQ.Clear();
+
+  return rv;
+}
+
+NS_IMETHODIMP
+FTPChannelChild::GetDivertingToParent(bool* aDiverting)
+{
+  NS_ENSURE_ARG_POINTER(aDiverting);
+  *aDiverting = mDivertingToParent;
+  return NS_OK;
+}
+
+} // namespace net
+} // namespace mozilla
+