Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

9 files changed, 2174 insertions, 0 deletions

diff --git a/netwerk/protocol/gio/GIOChannelChild.cpp b/netwerk/protocol/gio/GIOChannelChild.cpp
new file mode 100644
index 0000000000..75e519b2ce
--- /dev/null
+++ b/netwerk/protocol/gio/GIOChannelChild.cpp
@@ -0,0 +1,461 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=4 sw=2 sts=2 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 "GIOChannelChild.h"
+#include "nsGIOProtocolHandler.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/dom/BrowserChild.h"
+#include "nsContentUtils.h"
+#include "nsIBrowserChild.h"
+#include "nsStringStream.h"
+#include "nsNetUtil.h"
+#include "base/compiler_specific.h"
+#include "mozilla/ipc/IPCStreamUtils.h"
+#include "mozilla/ipc/URIUtils.h"
+#include "SerializedLoadContext.h"
+#include "mozilla/ipc/BackgroundUtils.h"
+#include "nsIURIMutator.h"
+#include "nsContentSecurityManager.h"
+#include "SerializedLoadContext.h"
+#include "mozilla/Logging.h"
+
+using mozilla::dom::ContentChild;
+
+namespace mozilla {
+#undef LOG
+#define LOG(args) MOZ_LOG(gGIOLog, mozilla::LogLevel::Debug, args)
+namespace net {
+
+GIOChannelChild::GIOChannelChild(nsIURI* aUri)
+    : mEventQ(new ChannelEventQueue(static_cast<nsIChildChannel*>(this))) {
+  SetURI(aUri);
+  // 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();
+}
+
+void GIOChannelChild::AddIPDLReference() {
+  MOZ_ASSERT(!mIPCOpen, "Attempt to retain more than one IPDL reference");
+  mIPCOpen = true;
+  AddRef();
+}
+
+void GIOChannelChild::ReleaseIPDLReference() {
+  MOZ_ASSERT(mIPCOpen, "Attempt to release nonexistent IPDL reference");
+  mIPCOpen = false;
+  Release();
+}
+
+//-----------------------------------------------------------------------------
+// GIOChannelChild::nsISupports
+//-----------------------------------------------------------------------------
+
+NS_IMPL_ISUPPORTS_INHERITED(GIOChannelChild, nsBaseChannel, nsIChildChannel)
+
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+GIOChannelChild::AsyncOpen(nsIStreamListener* aListener) {
+  nsCOMPtr<nsIStreamListener> listener = aListener;
+  nsresult rv =
+      nsContentSecurityManager::doContentSecurityCheck(this, listener);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  LOG(("GIOChannelChild::AsyncOpen [this=%p]\n", this));
+
+  NS_ENSURE_TRUE((gNeckoChild), NS_ERROR_FAILURE);
+  NS_ENSURE_TRUE(
+      !static_cast<ContentChild*>(gNeckoChild->Manager())->IsShuttingDown(),
+      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.
+  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::BrowserChild* browserChild = nullptr;
+  nsCOMPtr<nsIBrowserChild> iBrowserChild;
+  NS_QueryNotificationCallbacks(mCallbacks, mLoadGroup,
+                                NS_GET_IID(nsIBrowserChild),
+                                getter_AddRefs(iBrowserChild));
+  GetCallback(iBrowserChild);
+  if (iBrowserChild) {
+    browserChild =
+        static_cast<mozilla::dom::BrowserChild*>(iBrowserChild.get());
+  }
+
+  mListener = listener;
+
+  // add ourselves to the load group.
+  if (mLoadGroup) {
+    mLoadGroup->AddRequest(this, nullptr);
+  }
+
+  Maybe<mozilla::ipc::IPCStream> ipcStream;
+  mozilla::ipc::SerializeIPCStream(do_AddRef(mUploadStream), ipcStream,
+                                   /* aAllowLazy */ false);
+
+  uint32_t loadFlags = 0;
+  GetLoadFlags(&loadFlags);
+
+  GIOChannelOpenArgs openArgs;
+  SerializeURI(nsBaseChannel::URI(), openArgs.uri());
+  openArgs.startPos() = mStartPos;
+  openArgs.entityID() = mEntityID;
+  openArgs.uploadStream() = ipcStream;
+  openArgs.loadFlags() = loadFlags;
+
+  nsCOMPtr<nsILoadInfo> loadInfo = LoadInfo();
+  rv = mozilla::ipc::LoadInfoToLoadInfoArgs(loadInfo, &openArgs.loadInfo());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // This must happen before the constructor message is sent.
+  SetupNeckoTarget();
+
+  gNeckoChild->SendPGIOChannelConstructor(
+      this, browserChild, 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
+GIOChannelChild::IsPending(bool* aResult) {
+  *aResult = mIsPending;
+  return NS_OK;
+}
+
+nsresult GIOChannelChild::OpenContentStream(bool aAsync,
+                                            nsIInputStream** aStream,
+                                            nsIChannel** aChannel) {
+  MOZ_CRASH("GIOChannel*Child* should never have OpenContentStream called!");
+  return NS_OK;
+}
+
+mozilla::ipc::IPCResult GIOChannelChild::RecvOnStartRequest(
+    const nsresult& aChannelStatus, const int64_t& aContentLength,
+    const nsACString& aContentType, const nsACString& aEntityID,
+    const URIParams& aURI) {
+  LOG(("GIOChannelChild::RecvOnStartRequest [this=%p]\n", this));
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<GIOChannelChild>(this), aChannelStatus,
+             aContentLength, aContentType = nsCString(aContentType),
+             aEntityID = nsCString(aEntityID), aURI]() {
+        self->DoOnStartRequest(aChannelStatus, aContentLength, aContentType,
+                               aEntityID, aURI);
+      }));
+  return IPC_OK();
+}
+
+void GIOChannelChild::DoOnStartRequest(const nsresult& aChannelStatus,
+                                       const int64_t& aContentLength,
+                                       const nsACString& aContentType,
+                                       const nsACString& aEntityID,
+                                       const URIParams& aURI) {
+  LOG(("GIOChannelChild::DoOnStartRequest [this=%p]\n", this));
+  if (!mCanceled && NS_SUCCEEDED(mStatus)) {
+    mStatus = aChannelStatus;
+  }
+
+  mContentLength = aContentLength;
+  SetContentType(aContentType);
+  mEntityID = aEntityID;
+
+  nsCString spec;
+  nsCOMPtr<nsIURI> uri = DeserializeURI(aURI);
+  nsresult rv = uri->GetSpec(spec);
+  if (NS_SUCCEEDED(rv)) {
+    // Changes nsBaseChannel::URI()
+    rv = NS_MutateURI(mURI).SetSpec(spec).Finalize(mURI);
+  }
+
+  if (NS_FAILED(rv)) {
+    Cancel(rv);
+  }
+
+  AutoEventEnqueuer ensureSerialDispatch(mEventQ);
+  rv = mListener->OnStartRequest(this);
+  if (NS_FAILED(rv)) {
+    Cancel(rv);
+  }
+}
+
+mozilla::ipc::IPCResult GIOChannelChild::RecvOnDataAvailable(
+    const nsresult& aChannelStatus, const nsACString& aData,
+    const uint64_t& aOffset, const uint32_t& aCount) {
+  LOG(("GIOChannelChild::RecvOnDataAvailable [this=%p]\n", this));
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<GIOChannelChild>(this), aChannelStatus,
+             aData = nsCString(aData), aOffset, aCount]() {
+        self->DoOnDataAvailable(aChannelStatus, aData, aOffset, aCount);
+      }));
+
+  return IPC_OK();
+}
+
+void GIOChannelChild::DoOnDataAvailable(const nsresult& aChannelStatus,
+                                        const nsACString& aData,
+                                        const uint64_t& aOffset,
+                                        const uint32_t& aCount) {
+  LOG(("GIOChannelChild::DoOnDataAvailable [this=%p]\n", this));
+
+  if (!mCanceled && NS_SUCCEEDED(mStatus)) {
+    mStatus = aChannelStatus;
+  }
+
+  if (mCanceled) {
+    return;
+  }
+
+  // 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),
+                            Span(aData).To(aCount), NS_ASSIGNMENT_DEPEND);
+  if (NS_FAILED(rv)) {
+    Cancel(rv);
+    return;
+  }
+
+  AutoEventEnqueuer ensureSerialDispatch(mEventQ);
+  rv = mListener->OnDataAvailable(this, stringStream, aOffset, aCount);
+  if (NS_FAILED(rv)) {
+    Cancel(rv);
+  }
+  stringStream->Close();
+}
+
+mozilla::ipc::IPCResult GIOChannelChild::RecvOnStopRequest(
+    const nsresult& aChannelStatus) {
+  LOG(("GIOChannelChild::RecvOnStopRequest [this=%p status=%" PRIx32 "]\n",
+       this, static_cast<uint32_t>(aChannelStatus)));
+
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<GIOChannelChild>(this), aChannelStatus]() {
+        self->DoOnStopRequest(aChannelStatus);
+      }));
+  return IPC_OK();
+}
+
+void GIOChannelChild::DoOnStopRequest(const nsresult& aChannelStatus) {
+  LOG(("GIOChannelChild::DoOnStopRequest [this=%p status=%" PRIx32 "]\n", this,
+       static_cast<uint32_t>(aChannelStatus)));
+
+  if (!mCanceled) {
+    mStatus = aChannelStatus;
+  }
+
+  {  // Ensure that all queued ipdl events are dispatched before
+    // we initiate protocol deletion below.
+    mIsPending = false;
+    AutoEventEnqueuer ensureSerialDispatch(mEventQ);
+    (void)mListener->OnStopRequest(this, aChannelStatus);
+
+    mListener = nullptr;
+
+    if (mLoadGroup) {
+      mLoadGroup->RemoveRequest(this, nullptr, aChannelStatus);
+    }
+  }
+
+  // This calls NeckoChild::DeallocPGIOChannelChild(), which deletes |this| if
+  // IPDL holds the last reference.  Don't rely on |this| existing after here!
+  Send__delete__(this);
+}
+
+mozilla::ipc::IPCResult GIOChannelChild::RecvFailedAsyncOpen(
+    const nsresult& aStatusCode) {
+  LOG(("GIOChannelChild::RecvFailedAsyncOpen [this=%p status=%" PRIx32 "]\n",
+       this, static_cast<uint32_t>(aStatusCode)));
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<GIOChannelChild>(this), aStatusCode]() {
+        self->DoFailedAsyncOpen(aStatusCode);
+      }));
+  return IPC_OK();
+}
+
+void GIOChannelChild::DoFailedAsyncOpen(const nsresult& aStatusCode) {
+  LOG(("GIOChannelChild::DoFailedAsyncOpen [this=%p status=%" PRIx32 "]\n",
+       this, static_cast<uint32_t>(aStatusCode)));
+  mStatus = aStatusCode;
+
+  if (mLoadGroup) {
+    mLoadGroup->RemoveRequest(this, nullptr, aStatusCode);
+  }
+
+  if (mListener) {
+    mListener->OnStartRequest(this);
+    mIsPending = false;
+    mListener->OnStopRequest(this, aStatusCode);
+  } else {
+    mIsPending = false;
+  }
+
+  mListener = nullptr;
+
+  if (mIPCOpen) {
+    Send__delete__(this);
+  }
+}
+
+mozilla::ipc::IPCResult GIOChannelChild::RecvDeleteSelf() {
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this,
+      [self = UnsafePtr<GIOChannelChild>(this)]() { self->DoDeleteSelf(); }));
+  return IPC_OK();
+}
+
+void GIOChannelChild::DoDeleteSelf() {
+  if (mIPCOpen) {
+    Send__delete__(this);
+  }
+}
+
+//-----------------------------------------------------------------------------
+// GIOChannelChild::nsIResumableChannel
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+GIOChannelChild::Cancel(nsresult aStatus) {
+  LOG(("GIOChannelChild::Cancel [this=%p]\n", this));
+
+  if (mCanceled) {
+    return NS_OK;
+  }
+
+  mCanceled = true;
+  mStatus = aStatus;
+  if (mIPCOpen) {
+    SendCancel(aStatus);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GIOChannelChild::Suspend() {
+  NS_ENSURE_TRUE(mIPCOpen, NS_ERROR_NOT_AVAILABLE);
+
+  LOG(("GIOChannelChild::Suspend [this=%p]\n", this));
+
+  // SendSuspend only once, when suspend goes from 0 to 1.
+  if (!mSuspendCount++) {
+    SendSuspend();
+    mSuspendSent = true;
+  }
+  mEventQ->Suspend();
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GIOChannelChild::Resume() {
+  NS_ENSURE_TRUE(mIPCOpen, NS_ERROR_NOT_AVAILABLE);
+
+  LOG(("GIOChannelChild::Resume [this=%p]\n", this));
+
+  // SendResume only once, when suspend count drops to 0.
+  if (!--mSuspendCount && mSuspendSent) {
+    SendResume();
+  }
+  mEventQ->Resume();
+
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// GIOChannelChild::nsIChildChannel
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+GIOChannelChild::ConnectParent(uint32_t aId) {
+  NS_ENSURE_TRUE((gNeckoChild), NS_ERROR_FAILURE);
+  NS_ENSURE_TRUE(
+      !static_cast<ContentChild*>(gNeckoChild->Manager())->IsShuttingDown(),
+      NS_ERROR_FAILURE);
+
+  LOG(("GIOChannelChild::ConnectParent [this=%p]\n", this));
+
+  mozilla::dom::BrowserChild* browserChild = nullptr;
+  nsCOMPtr<nsIBrowserChild> iBrowserChild;
+  NS_QueryNotificationCallbacks(mCallbacks, mLoadGroup,
+                                NS_GET_IID(nsIBrowserChild),
+                                getter_AddRefs(iBrowserChild));
+  GetCallback(iBrowserChild);
+  if (iBrowserChild) {
+    browserChild =
+        static_cast<mozilla::dom::BrowserChild*>(iBrowserChild.get());
+  }
+
+  // This must happen before the constructor message is sent.
+  SetupNeckoTarget();
+
+  // 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();
+
+  GIOChannelConnectArgs connectArgs(aId);
+
+  if (!gNeckoChild->SendPGIOChannelConstructor(
+          this, browserChild, IPC::SerializedLoadContext(this), connectArgs)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GIOChannelChild::CompleteRedirectSetup(nsIStreamListener* aListener) {
+  LOG(("GIOChannelChild::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 = aListener;
+
+  // 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;
+}
+
+void GIOChannelChild::SetupNeckoTarget() {
+  if (mNeckoTarget) {
+    return;
+  }
+  nsCOMPtr<nsILoadInfo> loadInfo = LoadInfo();
+  mNeckoTarget =
+      nsContentUtils::GetEventTargetByLoadInfo(loadInfo, TaskCategory::Network);
+  if (!mNeckoTarget) {
+    return;
+  }
+}
+
+}  // namespace net
+}  // namespace mozilla
diff --git a/netwerk/protocol/gio/GIOChannelChild.h b/netwerk/protocol/gio/GIOChannelChild.h
new file mode 100644
index 0000000000..158ab6804f
--- /dev/null
+++ b/netwerk/protocol/gio/GIOChannelChild.h
@@ -0,0 +1,111 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=4 sw=2 sts=2 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/. */
+
+#ifndef NS_GIOCHANNELCHILD_H
+#define NS_GIOCHANNELCHILD_H
+
+#include "mozilla/net/PGIOChannelChild.h"
+#include "mozilla/net/ChannelEventQueue.h"
+#include "nsBaseChannel.h"
+#include "nsIUploadChannel.h"
+#include "nsIProxiedChannel.h"
+#include "nsIResumableChannel.h"
+#include "nsIChildChannel.h"
+#include "nsIEventTarget.h"
+#include "nsIStreamListener.h"
+
+class nsIEventTarget;
+
+namespace mozilla {
+namespace net {
+
+class GIOChannelChild final : public PGIOChannelChild,
+                              public nsBaseChannel,
+                              public nsIChildChannel {
+ public:
+  using nsIStreamListener = ::nsIStreamListener;
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSICHILDCHANNEL
+
+  NS_IMETHOD Cancel(nsresult aStatus) override;
+  NS_IMETHOD Suspend() override;
+  NS_IMETHOD Resume() override;
+
+  explicit GIOChannelChild(nsIURI* uri);
+
+  void AddIPDLReference();
+  void ReleaseIPDLReference();
+
+  NS_IMETHOD AsyncOpen(nsIStreamListener* aListener) override;
+
+  // Note that we handle this ourselves, overriding the nsBaseChannel
+  // default behavior, in order to be e10s-friendly.
+  NS_IMETHOD IsPending(bool* aResult) override;
+
+  nsresult OpenContentStream(bool aAsync, nsIInputStream** aStream,
+                             nsIChannel** aChannel) override;
+
+  bool IsSuspended() const;
+
+ protected:
+  virtual ~GIOChannelChild() = default;
+
+  mozilla::ipc::IPCResult RecvOnStartRequest(const nsresult& aChannelStatus,
+                                             const int64_t& aContentLength,
+                                             const nsACString& aContentType,
+                                             const nsACString& aEntityID,
+                                             const URIParams& aURI) override;
+  mozilla::ipc::IPCResult RecvOnDataAvailable(const nsresult& aChannelStatus,
+                                              const nsACString& aData,
+                                              const uint64_t& aOffset,
+                                              const uint32_t& aCount) override;
+  mozilla::ipc::IPCResult RecvOnStopRequest(
+      const nsresult& aChannelStatus) override;
+  mozilla::ipc::IPCResult RecvFailedAsyncOpen(
+      const nsresult& aStatusCode) override;
+  mozilla::ipc::IPCResult RecvDeleteSelf() override;
+
+  void DoOnStartRequest(const nsresult& aChannelStatus,
+                        const int64_t& aContentLength,
+                        const nsACString& aContentType,
+                        const nsACString& aEntityID, const URIParams& aURI);
+  void DoOnDataAvailable(const nsresult& aChannelStatus,
+                         const nsACString& aData, const uint64_t& aOffset,
+                         const uint32_t& aCount);
+  void DoOnStopRequest(const nsresult& aChannelStatus);
+  void DoFailedAsyncOpen(const nsresult& aStatusCode);
+  void DoDeleteSelf();
+
+  void SetupNeckoTarget() override;
+
+  friend class NeckoTargetChannelFunctionEvent;
+
+ private:
+  nsCOMPtr<nsIInputStream> mUploadStream;
+
+  bool mIPCOpen = false;
+  const RefPtr<ChannelEventQueue> mEventQ;
+
+  bool mCanceled = false;
+  uint32_t mSuspendCount = 0;
+  ;
+  bool mIsPending = false;
+
+  uint64_t mStartPos = 0;
+  nsCString mEntityID;
+
+  // Set if SendSuspend is called. Determines if SendResume is needed when
+  // diverting callbacks to parent.
+  bool mSuspendSent = false;
+};
+
+inline bool GIOChannelChild::IsSuspended() const { return mSuspendCount != 0; }
+
+}  // namespace net
+}  // namespace mozilla
+
+#endif /* NS_GIOCHANNELCHILD_H */
diff --git a/netwerk/protocol/gio/GIOChannelParent.cpp b/netwerk/protocol/gio/GIOChannelParent.cpp
new file mode 100644
index 0000000000..e6127dcd69
--- /dev/null
+++ b/netwerk/protocol/gio/GIOChannelParent.cpp
@@ -0,0 +1,324 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=4 sw=2 sts=2 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 "GIOChannelParent.h"
+#include "nsGIOProtocolHandler.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/BrowserParent.h"
+#include "mozilla/net/NeckoParent.h"
+#include "nsNetUtil.h"
+#include "nsIChannel.h"
+#include "mozilla/net/NeckoChannelParams.h"
+#include "nsIAuthPrompt.h"
+#include "nsIAuthPromptProvider.h"
+#include "nsISecureBrowserUI.h"
+#include "nsQueryObject.h"
+#include "mozilla/Logging.h"
+#include "mozilla/net/ChannelEventQueue.h"
+#include "mozilla/ipc/URIUtils.h"
+
+using namespace mozilla::dom;
+using namespace mozilla::ipc;
+
+namespace mozilla {
+#undef LOG
+#define LOG(args) MOZ_LOG(gGIOLog, mozilla::LogLevel::Debug, args)
+namespace net {
+
+GIOChannelParent::GIOChannelParent(dom::BrowserParent* aIframeEmbedding,
+                                   nsILoadContext* aLoadContext,
+                                   PBOverrideStatus aOverrideStatus)
+    : mLoadContext(aLoadContext),
+      mPBOverride(aOverrideStatus),
+      mBrowserParent(aIframeEmbedding) {
+  mEventQ = new ChannelEventQueue(static_cast<nsIParentChannel*>(this));
+}
+
+void GIOChannelParent::ActorDestroy(ActorDestroyReason why) {
+  // We may still have refcount>0 if the channel hasn't called OnStopRequest
+  // yet, but we must not send any more msgs to child.
+  mIPCClosed = true;
+}
+
+//-----------------------------------------------------------------------------
+// GIOChannelParent::nsISupports
+//-----------------------------------------------------------------------------
+NS_IMPL_ISUPPORTS(GIOChannelParent, nsIStreamListener, nsIParentChannel,
+                  nsIInterfaceRequestor, nsIRequestObserver)
+
+//-----------------------------------------------------------------------------
+// GIOChannelParent methods
+//-----------------------------------------------------------------------------
+
+bool GIOChannelParent::Init(const GIOChannelCreationArgs& aOpenArgs) {
+  switch (aOpenArgs.type()) {
+    case GIOChannelCreationArgs::TGIOChannelOpenArgs: {
+      const GIOChannelOpenArgs& a = aOpenArgs.get_GIOChannelOpenArgs();
+      return DoAsyncOpen(a.uri(), a.startPos(), a.entityID(), a.uploadStream(),
+                         a.loadInfo(), a.loadFlags());
+    }
+    case GIOChannelCreationArgs::TGIOChannelConnectArgs: {
+      const GIOChannelConnectArgs& cArgs =
+          aOpenArgs.get_GIOChannelConnectArgs();
+      return ConnectChannel(cArgs.channelId());
+    }
+    default:
+      MOZ_ASSERT_UNREACHABLE("unknown open type");
+      return false;
+  }
+}
+
+bool GIOChannelParent::DoAsyncOpen(const URIParams& aURI,
+                                   const uint64_t& aStartPos,
+                                   const nsCString& aEntityID,
+                                   const Maybe<IPCStream>& aUploadStream,
+                                   const Maybe<LoadInfoArgs>& aLoadInfoArgs,
+                                   const uint32_t& aLoadFlags) {
+  nsresult rv;
+
+  nsCOMPtr<nsIURI> uri = DeserializeURI(aURI);
+  if (!uri) {
+    return false;
+  }
+
+#ifdef DEBUG
+  LOG(("GIOChannelParent DoAsyncOpen [this=%p uri=%s]\n", this,
+       uri->GetSpecOrDefault().get()));
+#endif
+
+  nsCOMPtr<nsIIOService> ios(do_GetIOService(&rv));
+  if (NS_FAILED(rv)) {
+    return SendFailedAsyncOpen(rv);
+  }
+
+  nsAutoCString remoteType;
+  rv = GetRemoteType(remoteType);
+  if (NS_FAILED(rv)) {
+    return SendFailedAsyncOpen(rv);
+  }
+
+  nsCOMPtr<nsILoadInfo> loadInfo;
+  rv = mozilla::ipc::LoadInfoArgsToLoadInfo(aLoadInfoArgs, remoteType,
+                                            getter_AddRefs(loadInfo));
+  if (NS_FAILED(rv)) {
+    return SendFailedAsyncOpen(rv);
+  }
+
+  OriginAttributes attrs;
+  rv = loadInfo->GetOriginAttributes(&attrs);
+  if (NS_FAILED(rv)) {
+    return SendFailedAsyncOpen(rv);
+  }
+
+  nsCOMPtr<nsIChannel> chan;
+  rv = NS_NewChannelInternal(getter_AddRefs(chan), uri, loadInfo, nullptr,
+                             nullptr, nullptr, aLoadFlags, ios);
+
+  if (NS_FAILED(rv)) {
+    return SendFailedAsyncOpen(rv);
+  }
+
+  mChannel = chan;
+
+  nsIChannel* gioChan = static_cast<nsIChannel*>(mChannel.get());
+
+  rv = gioChan->AsyncOpen(this);
+  if (NS_FAILED(rv)) {
+    return SendFailedAsyncOpen(rv);
+  }
+
+  return true;
+}
+
+bool GIOChannelParent::ConnectChannel(const uint64_t& channelId) {
+  nsresult rv;
+
+  LOG(("Looking for a registered channel [this=%p, id=%" PRIx64 "]", this,
+       channelId));
+
+  nsCOMPtr<nsIChannel> channel;
+  rv = NS_LinkRedirectChannels(channelId, this, getter_AddRefs(channel));
+  if (NS_SUCCEEDED(rv)) {
+    mChannel = channel;
+  }
+
+  LOG(("  found channel %p, rv=%08" PRIx32, mChannel.get(),
+       static_cast<uint32_t>(rv)));
+
+  return true;
+}
+
+mozilla::ipc::IPCResult GIOChannelParent::RecvCancel(const nsresult& status) {
+  if (mChannel) {
+    mChannel->Cancel(status);
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GIOChannelParent::RecvSuspend() {
+  if (mChannel) {
+    mChannel->Suspend();
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult GIOChannelParent::RecvResume() {
+  if (mChannel) {
+    mChannel->Resume();
+  }
+  return IPC_OK();
+}
+
+//-----------------------------------------------------------------------------
+// GIOChannelParent::nsIRequestObserver
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+GIOChannelParent::OnStartRequest(nsIRequest* aRequest) {
+  LOG(("GIOChannelParent::OnStartRequest [this=%p]\n", this));
+  nsCOMPtr<nsIChannel> chan = do_QueryInterface(aRequest);
+  MOZ_ASSERT(chan);
+  NS_ENSURE_TRUE(chan, NS_ERROR_UNEXPECTED);
+
+  int64_t contentLength;
+  chan->GetContentLength(&contentLength);
+  nsCString contentType;
+  chan->GetContentType(contentType);
+  nsresult channelStatus = NS_OK;
+  chan->GetStatus(&channelStatus);
+
+  nsCString entityID;
+  URIParams uriparam;
+  nsCOMPtr<nsIURI> uri;
+  chan->GetURI(getter_AddRefs(uri));
+  SerializeURI(uri, uriparam);
+
+  if (mIPCClosed || !SendOnStartRequest(channelStatus, contentLength,
+                                        contentType, entityID, uriparam)) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GIOChannelParent::OnStopRequest(nsIRequest* aRequest, nsresult aStatusCode) {
+  LOG(("GIOChannelParent::OnStopRequest: [this=%p status=%" PRIu32 "]\n", this,
+       static_cast<uint32_t>(aStatusCode)));
+
+  if (mIPCClosed || !SendOnStopRequest(aStatusCode)) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// GIOChannelParent::nsIStreamListener
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+GIOChannelParent::OnDataAvailable(nsIRequest* aRequest,
+                                  nsIInputStream* aInputStream,
+                                  uint64_t aOffset, uint32_t aCount) {
+  LOG(("GIOChannelParent::OnDataAvailable [this=%p]\n", this));
+
+  nsCString data;
+  nsresult rv = NS_ReadInputStreamToString(aInputStream, data, aCount);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  nsresult channelStatus = NS_OK;
+  mChannel->GetStatus(&channelStatus);
+
+  if (mIPCClosed ||
+      !SendOnDataAvailable(channelStatus, data, aOffset, aCount)) {
+    return NS_ERROR_UNEXPECTED;
+  }
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// GIOChannelParent::nsIParentChannel
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+GIOChannelParent::SetParentListener(ParentChannelListener* aListener) {
+  // Do not need ptr to ParentChannelListener.
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GIOChannelParent::NotifyClassificationFlags(uint32_t aClassificationFlags,
+                                            bool aIsThirdParty) {
+  // Nothing to do.
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GIOChannelParent::SetClassifierMatchedInfo(const nsACString& aList,
+                                           const nsACString& aProvider,
+                                           const nsACString& aFullHash) {
+  // nothing to do
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GIOChannelParent::SetClassifierMatchedTrackingInfo(
+    const nsACString& aLists, const nsACString& aFullHashes) {
+  // nothing to do
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GIOChannelParent::Delete() {
+  if (mIPCClosed || !SendDeleteSelf()) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GIOChannelParent::GetRemoteType(nsACString& aRemoteType) {
+  if (!CanSend()) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  dom::PContentParent* pcp = Manager()->Manager();
+  aRemoteType = static_cast<dom::ContentParent*>(pcp)->GetRemoteType();
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// GIOChannelParent::nsIInterfaceRequestor
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+GIOChannelParent::GetInterface(const nsIID& uuid, void** result) {
+  if (uuid.Equals(NS_GET_IID(nsIAuthPromptProvider)) ||
+      uuid.Equals(NS_GET_IID(nsISecureBrowserUI))) {
+    if (mBrowserParent) {
+      return mBrowserParent->QueryInterface(uuid, result);
+    }
+  }
+
+  // Only support nsILoadContext if child channel's callbacks did too
+  if (uuid.Equals(NS_GET_IID(nsILoadContext)) && mLoadContext) {
+    nsCOMPtr<nsILoadContext> copy = mLoadContext;
+    copy.forget(result);
+    return NS_OK;
+  }
+
+  return QueryInterface(uuid, result);
+}
+
+//---------------------
+}  // namespace net
+}  // namespace mozilla
diff --git a/netwerk/protocol/gio/GIOChannelParent.h b/netwerk/protocol/gio/GIOChannelParent.h
new file mode 100644
index 0000000000..21d41f0687
--- /dev/null
+++ b/netwerk/protocol/gio/GIOChannelParent.h
@@ -0,0 +1,80 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=4 sw=2 sts=2 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/. */
+
+#ifndef NS_GIOCHANNELPARENT_H
+#define NS_GIOCHANNELPARENT_H
+
+#include "mozilla/net/PGIOChannelParent.h"
+#include "mozilla/net/NeckoParent.h"
+#include "nsIParentChannel.h"
+#include "nsIInterfaceRequestor.h"
+
+class nsILoadContext;
+
+namespace mozilla {
+
+namespace dom {
+class BrowserParent;
+}  // namespace dom
+
+namespace net {
+class ChannelEventQueue;
+
+class GIOChannelParent final : public PGIOChannelParent,
+                               public nsIParentChannel,
+                               public nsIInterfaceRequestor {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIREQUESTOBSERVER
+  NS_DECL_NSISTREAMLISTENER
+  NS_DECL_NSIPARENTCHANNEL
+  NS_DECL_NSIINTERFACEREQUESTOR
+
+  GIOChannelParent(dom::BrowserParent* aIframeEmbedding,
+                   nsILoadContext* aLoadContext,
+                   PBOverrideStatus aOverrideStatus);
+
+  bool Init(const GIOChannelCreationArgs& aOpenArgs);
+
+ protected:
+  virtual ~GIOChannelParent() = default;
+
+  bool DoAsyncOpen(const URIParams& aURI, const uint64_t& aStartPos,
+                   const nsCString& aEntityID,
+                   const Maybe<mozilla::ipc::IPCStream>& aUploadStream,
+                   const Maybe<LoadInfoArgs>& aLoadInfoArgs,
+                   const uint32_t& aLoadFlags);
+
+  // used to connect redirected-to channel in parent with just created
+  // ChildChannel.  Used during HTTP->FTP redirects.
+  bool ConnectChannel(const uint64_t& channelId);
+
+  virtual mozilla::ipc::IPCResult RecvCancel(const nsresult& status) override;
+  virtual mozilla::ipc::IPCResult RecvSuspend() override;
+  virtual mozilla::ipc::IPCResult RecvResume() override;
+
+  virtual void ActorDestroy(ActorDestroyReason why) override;
+
+  nsCOMPtr<nsIChannel> mChannel;
+
+  bool mIPCClosed = false;
+
+  nsCOMPtr<nsILoadContext> mLoadContext;
+
+  PBOverrideStatus mPBOverride;
+
+  // Set to the canceled status value if the main channel was canceled.
+  nsresult mStatus = NS_OK;
+
+  RefPtr<mozilla::dom::BrowserParent> mBrowserParent;
+
+  RefPtr<ChannelEventQueue> mEventQ;
+};
+
+}  // namespace net
+}  // namespace mozilla
+
+#endif /* NS_GIOCHANNELPARENT_H */
diff --git a/netwerk/protocol/gio/PGIOChannel.ipdl b/netwerk/protocol/gio/PGIOChannel.ipdl
new file mode 100644
index 0000000000..e4f1f6380b
--- /dev/null
+++ b/netwerk/protocol/gio/PGIOChannel.ipdl
@@ -0,0 +1,51 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et tw=80 ft=cpp : */
+
+/* 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 protocol PNecko;
+include URIParams;
+
+//FIXME: bug #792908 (NeckoChannelParams already included by PNecko)
+include NeckoChannelParams;
+
+using PRTime from "prtime.h";
+
+namespace mozilla {
+namespace net {
+
+[ManualDealloc, ChildImpl=virtual, ParentImpl=virtual]
+async protocol PGIOChannel
+{
+  manager PNecko;
+
+parent:
+  // Note: channels are opened during construction, so no open method here:
+  // see PNecko.ipdl
+
+  async __delete__();
+
+  async Cancel(nsresult status);
+  async Suspend();
+  async Resume();
+
+child:
+  async OnStartRequest(nsresult aChannelStatus,
+                       int64_t aContentLength,
+                       nsCString aContentType,
+                       nsCString aEntityID,
+                       URIParams aURI);
+  async OnDataAvailable(nsresult channelStatus,
+                        nsCString data,
+                        uint64_t offset,
+                        uint32_t count);
+  async OnStopRequest(nsresult channelStatus);
+  async FailedAsyncOpen(nsresult statusCode);
+
+  async DeleteSelf();
+};
+
+} // namespace net
+} // namespace mozilla
diff --git a/netwerk/protocol/gio/components.conf b/netwerk/protocol/gio/components.conf
new file mode 100644
index 0000000000..a2bbfd8f19
--- /dev/null
+++ b/netwerk/protocol/gio/components.conf
@@ -0,0 +1,24 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+Classes = [
+    {
+        'cid': '{ee706783-3af8-4d19-9e84-e2ebfe213480}',
+        'contract_ids': ['@mozilla.org/network/protocol;1?name=moz-gio'],
+        'singleton': True,
+        'type': 'nsGIOProtocolHandler',
+        'headers': ['nsGIOProtocolHandler.h'],
+        'constructor': 'nsGIOProtocolHandler::GetSingleton',
+        'categories': { 'xpcom-startup': 'nsGIOProtocolHandler' },
+        'protocol_config': {
+            'scheme': 'moz-gio',
+            'flags': [
+                'URI_STD',
+                'URI_DANGEROUS_TO_LOAD',
+            ],
+        },
+    },
+]
diff --git a/netwerk/protocol/gio/moz.build b/netwerk/protocol/gio/moz.build
new file mode 100644
index 0000000000..4078e5605c
--- /dev/null
+++ b/netwerk/protocol/gio/moz.build
@@ -0,0 +1,42 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+XPCOM_MANIFESTS += [
+    "components.conf",
+]
+
+EXPORTS += [
+    "nsGIOProtocolHandler.h",
+]
+
+EXPORTS.mozilla.net += [
+    "GIOChannelChild.h",
+    "GIOChannelParent.h",
+]
+
+UNIFIED_SOURCES += [
+    "GIOChannelChild.cpp",
+    "GIOChannelParent.cpp",
+    "nsGIOProtocolHandler.cpp",
+]
+
+IPDL_SOURCES = [
+    "PGIOChannel.ipdl",
+]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+LOCAL_INCLUDES += [
+    "/netwerk/base",
+]
+
+FINAL_LIBRARY = "xul"
+
+if CONFIG["MOZ_WIDGET_TOOLKIT"] == "gtk":
+    CXXFLAGS += CONFIG["MOZ_GTK3_CFLAGS"]
+
+with Files("**"):
+    BUG_COMPONENT = ("Core", "Widget: Gtk")
diff --git a/netwerk/protocol/gio/nsGIOProtocolHandler.cpp b/netwerk/protocol/gio/nsGIOProtocolHandler.cpp
new file mode 100644
index 0000000000..51679f3f8c
--- /dev/null
+++ b/netwerk/protocol/gio/nsGIOProtocolHandler.cpp
@@ -0,0 +1,1043 @@
+/* vim:set ts=2 sw=2 et cindent: */
+/* 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/. */
+
+/*
+ * This code is based on original Mozilla gnome-vfs extension. It implements
+ * input stream provided by GVFS/GIO.
+ */
+#include "nsGIOProtocolHandler.h"
+#include "GIOChannelChild.h"
+#include "mozilla/Components.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/Logging.h"
+#include "mozilla/net/NeckoChild.h"
+#include "mozilla/NullPrincipal.h"
+#include "nsIPrefBranch.h"
+#include "nsIPrefService.h"
+#include "nsIObserver.h"
+#include "nsCRT.h"
+#include "nsThreadUtils.h"
+#include "nsProxyRelease.h"
+#include "nsIStringBundle.h"
+#include "nsMimeTypes.h"
+#include "nsNetCID.h"
+#include "nsNetUtil.h"
+#include "nsServiceManagerUtils.h"
+#include "nsIURI.h"
+#include "nsIAuthPrompt.h"
+#include "nsIChannel.h"
+#include "nsIInputStream.h"
+#include "nsIProtocolHandler.h"
+#include "mozilla/Monitor.h"
+#include "prtime.h"
+#include <gio/gio.h>
+#include <algorithm>
+
+using namespace mozilla;
+
+#define MOZ_GIO_SCHEME "moz-gio"
+#define MOZ_GIO_SUPPORTED_PROTOCOLS "network.gio.supported-protocols"
+
+//-----------------------------------------------------------------------------
+
+// NSPR_LOG_MODULES=gio:5
+LazyLogModule gGIOLog("gio");
+#undef LOG
+#define LOG(args) MOZ_LOG(gGIOLog, mozilla::LogLevel::Debug, args)
+
+//-----------------------------------------------------------------------------
+static nsresult MapGIOResult(gint code) {
+  switch (code) {
+    case G_IO_ERROR_NOT_FOUND:
+      return NS_ERROR_FILE_NOT_FOUND;  // shows error
+    case G_IO_ERROR_INVALID_ARGUMENT:
+      return NS_ERROR_INVALID_ARG;
+    case G_IO_ERROR_NOT_SUPPORTED:
+      return NS_ERROR_NOT_AVAILABLE;
+    case G_IO_ERROR_NO_SPACE:
+      return NS_ERROR_FILE_NO_DEVICE_SPACE;
+    case G_IO_ERROR_READ_ONLY:
+      return NS_ERROR_FILE_READ_ONLY;
+    case G_IO_ERROR_PERMISSION_DENIED:
+      return NS_ERROR_FILE_ACCESS_DENIED;  // wrong password/login
+    case G_IO_ERROR_CLOSED:
+      return NS_BASE_STREAM_CLOSED;  // was EOF
+    case G_IO_ERROR_NOT_DIRECTORY:
+      return NS_ERROR_FILE_NOT_DIRECTORY;
+    case G_IO_ERROR_PENDING:
+      return NS_ERROR_IN_PROGRESS;
+    case G_IO_ERROR_EXISTS:
+      return NS_ERROR_FILE_ALREADY_EXISTS;
+    case G_IO_ERROR_IS_DIRECTORY:
+      return NS_ERROR_FILE_IS_DIRECTORY;
+    case G_IO_ERROR_NOT_MOUNTED:
+      return NS_ERROR_NOT_CONNECTED;  // shows error
+    case G_IO_ERROR_HOST_NOT_FOUND:
+      return NS_ERROR_UNKNOWN_HOST;  // shows error
+    case G_IO_ERROR_CANCELLED:
+      return NS_ERROR_ABORT;
+    case G_IO_ERROR_NOT_EMPTY:
+      return NS_ERROR_FILE_DIR_NOT_EMPTY;
+    case G_IO_ERROR_FILENAME_TOO_LONG:
+      return NS_ERROR_FILE_NAME_TOO_LONG;
+    case G_IO_ERROR_INVALID_FILENAME:
+      return NS_ERROR_FILE_INVALID_PATH;
+    case G_IO_ERROR_TIMED_OUT:
+      return NS_ERROR_NET_TIMEOUT;  // shows error
+    case G_IO_ERROR_WOULD_BLOCK:
+      return NS_BASE_STREAM_WOULD_BLOCK;
+    case G_IO_ERROR_FAILED_HANDLED:
+      return NS_ERROR_ABORT;  // Cancel on login dialog
+
+      /* unhandled:
+        G_IO_ERROR_NOT_REGULAR_FILE,
+        G_IO_ERROR_NOT_SYMBOLIC_LINK,
+        G_IO_ERROR_NOT_MOUNTABLE_FILE,
+        G_IO_ERROR_TOO_MANY_LINKS,
+        G_IO_ERROR_ALREADY_MOUNTED,
+        G_IO_ERROR_CANT_CREATE_BACKUP,
+        G_IO_ERROR_WRONG_ETAG,
+        G_IO_ERROR_WOULD_RECURSE,
+        G_IO_ERROR_BUSY,
+        G_IO_ERROR_WOULD_MERGE,
+        G_IO_ERROR_TOO_MANY_OPEN_FILES
+      */
+    // Make GCC happy
+    default:
+      return NS_ERROR_FAILURE;
+  }
+}
+
+static nsresult MapGIOResult(GError* result) {
+  if (!result) {
+    return NS_OK;
+  }
+  return MapGIOResult(result->code);
+}
+
+/** Return values for mount operation.
+ * These enums are used as mount operation return values.
+ */
+enum class MountOperationResult {
+  MOUNT_OPERATION_IN_PROGRESS, /** \enum operation in progress */
+  MOUNT_OPERATION_SUCCESS,     /** \enum operation successful */
+  MOUNT_OPERATION_FAILED       /** \enum operation not successful */
+};
+
+//-----------------------------------------------------------------------------
+/**
+ * Sort function compares according to file type (directory/file)
+ * and alphabethical order
+ * @param a pointer to GFileInfo object to compare
+ * @param b pointer to GFileInfo object to compare
+ * @return -1 when first object should be before the second, 0 when equal,
+ * +1 when second object should be before the first
+ */
+static gint FileInfoComparator(gconstpointer a, gconstpointer b) {
+  GFileInfo* ia = (GFileInfo*)a;
+  GFileInfo* ib = (GFileInfo*)b;
+  if (g_file_info_get_file_type(ia) == G_FILE_TYPE_DIRECTORY &&
+      g_file_info_get_file_type(ib) != G_FILE_TYPE_DIRECTORY) {
+    return -1;
+  }
+  if (g_file_info_get_file_type(ib) == G_FILE_TYPE_DIRECTORY &&
+      g_file_info_get_file_type(ia) != G_FILE_TYPE_DIRECTORY) {
+    return 1;
+  }
+
+  return nsCRT::strcasecmp(g_file_info_get_name(ia), g_file_info_get_name(ib));
+}
+
+/* Declaration of mount callback functions */
+static void mount_enclosing_volume_finished(GObject* source_object,
+                                            GAsyncResult* res,
+                                            gpointer user_data);
+static void mount_operation_ask_password(
+    GMountOperation* mount_op, const char* message, const char* default_user,
+    const char* default_domain, GAskPasswordFlags flags, gpointer user_data);
+//-----------------------------------------------------------------------------
+class nsGIOInputStream final : public nsIInputStream {
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIINPUTSTREAM
+
+  explicit nsGIOInputStream(const nsCString& uriSpec) : mSpec(uriSpec) {}
+
+  void SetChannel(nsIChannel* channel) {
+    // We need to hold an owning reference to our channel.  This is done
+    // so we can access the channel's notification callbacks to acquire
+    // a reference to a nsIAuthPrompt if we need to handle an interactive
+    // mount operation.
+    //
+    // However, the channel can only be accessed on the main thread, so
+    // we have to be very careful with ownership.  Moreover, it doesn't
+    // support threadsafe addref/release, so proxying is the answer.
+    //
+    // Also, it's important to note that this likely creates a reference
+    // cycle since the channel likely owns this stream.  This reference
+    // cycle is broken in our Close method.
+
+    mChannel = do_AddRef(channel).take();
+  }
+  void SetMountResult(MountOperationResult result, gint error_code);
+
+ private:
+  ~nsGIOInputStream() { Close(); }
+  nsresult DoOpen();
+  nsresult DoRead(char* aBuf, uint32_t aCount, uint32_t* aCountRead);
+  nsresult SetContentTypeOfChannel(const char* contentType);
+  nsresult MountVolume();
+  nsresult DoOpenDirectory();
+  nsresult DoOpenFile(GFileInfo* info);
+  nsCString mSpec;
+  nsIChannel* mChannel{nullptr};  // manually refcounted
+  GFile* mHandle{nullptr};
+  GFileInputStream* mStream{nullptr};
+  uint64_t mBytesRemaining{UINT64_MAX};
+  nsresult mStatus{NS_OK};
+  GList* mDirList{nullptr};
+  GList* mDirListPtr{nullptr};
+  nsCString mDirBuf;
+  uint32_t mDirBufCursor{0};
+  bool mDirOpen{false};
+  MountOperationResult mMountRes =
+      MountOperationResult::MOUNT_OPERATION_SUCCESS;
+  mozilla::Monitor mMonitorMountInProgress MOZ_UNANNOTATED{
+      "GIOInputStream::MountFinished"};
+  gint mMountErrorCode{};
+};
+
+/**
+ * Set result of mount operation and notify monitor waiting for results.
+ * This method is called in main thread as long as it is used only
+ * in mount_enclosing_volume_finished function.
+ * @param result Result of mount operation
+ */
+void nsGIOInputStream::SetMountResult(MountOperationResult result,
+                                      gint error_code) {
+  mozilla::MonitorAutoLock mon(mMonitorMountInProgress);
+  mMountRes = result;
+  mMountErrorCode = error_code;
+  mon.Notify();
+}
+
+/**
+ * Start mount operation and wait in loop until it is finished. This method is
+ * called from thread which is trying to read from location.
+ */
+nsresult nsGIOInputStream::MountVolume() {
+  GMountOperation* mount_op = g_mount_operation_new();
+  g_signal_connect(mount_op, "ask-password",
+                   G_CALLBACK(mount_operation_ask_password), mChannel);
+  mMountRes = MountOperationResult::MOUNT_OPERATION_IN_PROGRESS;
+  /* g_file_mount_enclosing_volume uses a dbus request to mount the volume.
+     Callback mount_enclosing_volume_finished is called in main thread
+     (not this thread on which this method is called). */
+  g_file_mount_enclosing_volume(mHandle, G_MOUNT_MOUNT_NONE, mount_op, nullptr,
+                                mount_enclosing_volume_finished, this);
+  mozilla::MonitorAutoLock mon(mMonitorMountInProgress);
+  /* Waiting for finish of mount operation thread */
+  while (mMountRes == MountOperationResult::MOUNT_OPERATION_IN_PROGRESS) {
+    mon.Wait();
+  }
+
+  g_object_unref(mount_op);
+
+  if (mMountRes == MountOperationResult::MOUNT_OPERATION_FAILED) {
+    return MapGIOResult(mMountErrorCode);
+  }
+  return NS_OK;
+}
+
+/**
+ * Create list of infos about objects in opened directory
+ * Return: NS_OK when list obtained, otherwise error code according
+ * to failed operation.
+ */
+nsresult nsGIOInputStream::DoOpenDirectory() {
+  GError* error = nullptr;
+
+  GFileEnumerator* f_enum = g_file_enumerate_children(
+      mHandle, "standard::*,time::*", G_FILE_QUERY_INFO_NONE, nullptr, &error);
+  if (!f_enum) {
+    nsresult rv = MapGIOResult(error);
+    g_warning("Cannot read from directory: %s", error->message);
+    g_error_free(error);
+    return rv;
+  }
+  // fill list of file infos
+  GFileInfo* info = g_file_enumerator_next_file(f_enum, nullptr, &error);
+  while (info) {
+    mDirList = g_list_append(mDirList, info);
+    info = g_file_enumerator_next_file(f_enum, nullptr, &error);
+  }
+  g_object_unref(f_enum);
+  if (error) {
+    g_warning("Error reading directory content: %s", error->message);
+    nsresult rv = MapGIOResult(error);
+    g_error_free(error);
+    return rv;
+  }
+  mDirOpen = true;
+
+  // Sort list of file infos by using FileInfoComparator function
+  mDirList = g_list_sort(mDirList, FileInfoComparator);
+  mDirListPtr = mDirList;
+
+  // Write base URL (make sure it ends with a '/')
+  mDirBuf.AppendLiteral("300: ");
+  mDirBuf.Append(mSpec);
+  if (mSpec.get()[mSpec.Length() - 1] != '/') {
+    mDirBuf.Append('/');
+  }
+  mDirBuf.Append('\n');
+
+  // Write column names
+  mDirBuf.AppendLiteral(
+      "200: filename content-length last-modified file-type\n");
+
+  // Write charset (assume UTF-8)
+  // XXX is this correct?
+  mDirBuf.AppendLiteral("301: UTF-8\n");
+  SetContentTypeOfChannel(APPLICATION_HTTP_INDEX_FORMAT);
+  return NS_OK;
+}
+
+/**
+ * Create file stream and set mime type for channel
+ * @param info file info used to determine mime type
+ * @return NS_OK when file stream created successfuly, error code otherwise
+ */
+nsresult nsGIOInputStream::DoOpenFile(GFileInfo* info) {
+  GError* error = nullptr;
+
+  mStream = g_file_read(mHandle, nullptr, &error);
+  if (!mStream) {
+    nsresult rv = MapGIOResult(error);
+    g_warning("Cannot read from file: %s", error->message);
+    g_error_free(error);
+    return rv;
+  }
+
+  const char* content_type = g_file_info_get_content_type(info);
+  if (content_type) {
+    char* mime_type = g_content_type_get_mime_type(content_type);
+    if (mime_type) {
+      if (strcmp(mime_type, APPLICATION_OCTET_STREAM) != 0) {
+        SetContentTypeOfChannel(mime_type);
+      }
+      g_free(mime_type);
+    }
+  } else {
+    g_warning("Missing content type.");
+  }
+
+  mBytesRemaining = g_file_info_get_size(info);
+  // Update the content length attribute on the channel.  We do this
+  // synchronously without proxying.  This hack is not as bad as it looks!
+  mChannel->SetContentLength(mBytesRemaining);
+
+  return NS_OK;
+}
+
+/**
+ * Start file open operation, mount volume when needed and according to file
+ * type create file output stream or read directory content.
+ * @return NS_OK when file or directory opened successfully, error code
+ * otherwise
+ */
+nsresult nsGIOInputStream::DoOpen() {
+  nsresult rv;
+  GError* error = nullptr;
+
+  NS_ASSERTION(mHandle == nullptr, "already open");
+
+  mHandle = g_file_new_for_uri(mSpec.get());
+
+  GFileInfo* info = g_file_query_info(mHandle, "standard::*",
+                                      G_FILE_QUERY_INFO_NONE, nullptr, &error);
+
+  if (error) {
+    if (error->domain == G_IO_ERROR && error->code == G_IO_ERROR_NOT_MOUNTED) {
+      // location is not yet mounted, try to mount
+      g_error_free(error);
+      if (NS_IsMainThread()) {
+        return NS_ERROR_NOT_CONNECTED;
+      }
+      error = nullptr;
+      rv = MountVolume();
+      if (rv != NS_OK) {
+        return rv;
+      }
+      // get info again
+      info = g_file_query_info(mHandle, "standard::*", G_FILE_QUERY_INFO_NONE,
+                               nullptr, &error);
+      // second try to get file info from remote files after media mount
+      if (!info) {
+        g_warning("Unable to get file info: %s", error->message);
+        rv = MapGIOResult(error);
+        g_error_free(error);
+        return rv;
+      }
+    } else {
+      g_warning("Unable to get file info: %s", error->message);
+      rv = MapGIOResult(error);
+      g_error_free(error);
+      return rv;
+    }
+  }
+  // Get file type to handle directories and file differently
+  GFileType f_type = g_file_info_get_file_type(info);
+  if (f_type == G_FILE_TYPE_DIRECTORY) {
+    // directory
+    rv = DoOpenDirectory();
+  } else if (f_type != G_FILE_TYPE_UNKNOWN) {
+    // file
+    rv = DoOpenFile(info);
+  } else {
+    g_warning("Unable to get file type.");
+    rv = NS_ERROR_FILE_NOT_FOUND;
+  }
+  if (info) {
+    g_object_unref(info);
+  }
+  return rv;
+}
+
+/**
+ * Read content of file or create file list from directory
+ * @param aBuf read destination buffer
+ * @param aCount length of destination buffer
+ * @param aCountRead number of read characters
+ * @return NS_OK when read successfully, NS_BASE_STREAM_CLOSED when end of file,
+ *         error code otherwise
+ */
+nsresult nsGIOInputStream::DoRead(char* aBuf, uint32_t aCount,
+                                  uint32_t* aCountRead) {
+  nsresult rv = NS_ERROR_NOT_AVAILABLE;
+  if (mStream) {
+    // file read
+    GError* error = nullptr;
+    uint32_t bytes_read = g_input_stream_read(G_INPUT_STREAM(mStream), aBuf,
+                                              aCount, nullptr, &error);
+    if (error) {
+      rv = MapGIOResult(error);
+      *aCountRead = 0;
+      g_warning("Cannot read from file: %s", error->message);
+      g_error_free(error);
+      return rv;
+    }
+    *aCountRead = bytes_read;
+    mBytesRemaining -= *aCountRead;
+    return NS_OK;
+  }
+  if (mDirOpen) {
+    // directory read
+    while (aCount && rv != NS_BASE_STREAM_CLOSED) {
+      // Copy data out of our buffer
+      uint32_t bufLen = mDirBuf.Length() - mDirBufCursor;
+      if (bufLen) {
+        uint32_t n = std::min(bufLen, aCount);
+        memcpy(aBuf, mDirBuf.get() + mDirBufCursor, n);
+        *aCountRead += n;
+        aBuf += n;
+        aCount -= n;
+        mDirBufCursor += n;
+      }
+
+      if (!mDirListPtr)  // Are we at the end of the directory list?
+      {
+        rv = NS_BASE_STREAM_CLOSED;
+      } else if (aCount)  // Do we need more data?
+      {
+        GFileInfo* info = (GFileInfo*)mDirListPtr->data;
+
+        // Prune '.' and '..' from directory listing.
+        const char* fname = g_file_info_get_name(info);
+        if (fname && fname[0] == '.' &&
+            (fname[1] == '\0' || (fname[1] == '.' && fname[2] == '\0'))) {
+          mDirListPtr = mDirListPtr->next;
+          continue;
+        }
+
+        mDirBuf.AssignLiteral("201: ");
+
+        // The "filename" field
+        nsCString escName;
+        nsCOMPtr<nsINetUtil> nu = do_GetService(NS_NETUTIL_CONTRACTID);
+        if (nu && fname) {
+          nu->EscapeString(nsDependentCString(fname),
+                           nsINetUtil::ESCAPE_URL_PATH, escName);
+
+          mDirBuf.Append(escName);
+          mDirBuf.Append(' ');
+        }
+
+        // The "content-length" field
+        // XXX truncates size from 64-bit to 32-bit
+        mDirBuf.AppendInt(int32_t(g_file_info_get_size(info)));
+        mDirBuf.Append(' ');
+
+        // The "last-modified" field
+        //
+        // NSPR promises: PRTime is compatible with time_t
+        // we just need to convert from seconds to microseconds
+        GTimeVal gtime;
+        g_file_info_get_modification_time(info, &gtime);
+
+        PRExplodedTime tm;
+        PRTime pt = ((PRTime)gtime.tv_sec) * 1000000;
+        PR_ExplodeTime(pt, PR_GMTParameters, &tm);
+        {
+          char buf[64];
+          PR_FormatTimeUSEnglish(buf, sizeof(buf),
+                                 "%a,%%20%d%%20%b%%20%Y%%20%H:%M:%S%%20GMT ",
+                                 &tm);
+          mDirBuf.Append(buf);
+        }
+
+        // The "file-type" field
+        switch (g_file_info_get_file_type(info)) {
+          case G_FILE_TYPE_REGULAR:
+            mDirBuf.AppendLiteral("FILE ");
+            break;
+          case G_FILE_TYPE_DIRECTORY:
+            mDirBuf.AppendLiteral("DIRECTORY ");
+            break;
+          case G_FILE_TYPE_SYMBOLIC_LINK:
+            mDirBuf.AppendLiteral("SYMBOLIC-LINK ");
+            break;
+          default:
+            break;
+        }
+        mDirBuf.Append('\n');
+
+        mDirBufCursor = 0;
+        mDirListPtr = mDirListPtr->next;
+      }
+    }
+  }
+  return rv;
+}
+
+/**
+ * This class is used to implement SetContentTypeOfChannel.
+ */
+class nsGIOSetContentTypeEvent : public mozilla::Runnable {
+ public:
+  nsGIOSetContentTypeEvent(nsIChannel* channel, const char* contentType)
+      : mozilla::Runnable("nsGIOSetContentTypeEvent"),
+        mChannel(channel),
+        mContentType(contentType) {
+    // stash channel reference in mChannel.  no AddRef here!  see note
+    // in SetContentTypeOfchannel.
+  }
+
+  NS_IMETHOD Run() override {
+    mChannel->SetContentType(mContentType);
+    return NS_OK;
+  }
+
+ private:
+  nsIChannel* mChannel;
+  nsCString mContentType;
+};
+
+nsresult nsGIOInputStream::SetContentTypeOfChannel(const char* contentType) {
+  // We need to proxy this call over to the main thread.  We post an
+  // asynchronous event in this case so that we don't delay reading data, and
+  // we know that this is safe to do since the channel's reference will be
+  // released asynchronously as well.  We trust the ordering of the main
+  // thread's event queue to protect us against memory corruption.
+
+  nsresult rv;
+  nsCOMPtr<nsIRunnable> ev =
+      new nsGIOSetContentTypeEvent(mChannel, contentType);
+  if (!ev) {
+    rv = NS_ERROR_OUT_OF_MEMORY;
+  } else {
+    rv = NS_DispatchToMainThread(ev);
+  }
+  return rv;
+}
+
+NS_IMPL_ISUPPORTS(nsGIOInputStream, nsIInputStream)
+
+/**
+ * Free all used memory and close stream.
+ */
+NS_IMETHODIMP
+nsGIOInputStream::Close() {
+  if (mStream) {
+    g_object_unref(mStream);
+    mStream = nullptr;
+  }
+
+  if (mHandle) {
+    g_object_unref(mHandle);
+    mHandle = nullptr;
+  }
+
+  if (mDirList) {
+    // Destroy the list of GIOFileInfo objects...
+    g_list_foreach(mDirList, (GFunc)g_object_unref, nullptr);
+    g_list_free(mDirList);
+    mDirList = nullptr;
+    mDirListPtr = nullptr;
+  }
+
+  if (mChannel) {
+    NS_ReleaseOnMainThread("nsGIOInputStream::mChannel", dont_AddRef(mChannel));
+
+    mChannel = nullptr;
+  }
+
+  mSpec.Truncate();  // free memory
+
+  // Prevent future reads from re-opening the handle.
+  if (NS_SUCCEEDED(mStatus)) {
+    mStatus = NS_BASE_STREAM_CLOSED;
+  }
+
+  return NS_OK;
+}
+
+/**
+ * Return number of remaining bytes available on input
+ * @param aResult remaining bytes
+ */
+NS_IMETHODIMP
+nsGIOInputStream::Available(uint64_t* aResult) {
+  if (NS_FAILED(mStatus)) {
+    return mStatus;
+  }
+
+  *aResult = mBytesRemaining;
+
+  return NS_OK;
+}
+
+/**
+ * Return the status of the input stream
+ */
+NS_IMETHODIMP
+nsGIOInputStream::StreamStatus() { return mStatus; }
+
+/**
+ * Trying to read from stream. When location is not available it tries to mount
+ * it.
+ * @param aBuf buffer to put read data
+ * @param aCount length of aBuf
+ * @param aCountRead number of bytes actually read
+ */
+NS_IMETHODIMP
+nsGIOInputStream::Read(char* aBuf, uint32_t aCount, uint32_t* aCountRead) {
+  *aCountRead = 0;
+  // Check if file is already opened, otherwise open it
+  if (!mStream && !mDirOpen && mStatus == NS_OK) {
+    mStatus = DoOpen();
+    if (NS_FAILED(mStatus)) {
+      return mStatus;
+    }
+  }
+
+  mStatus = DoRead(aBuf, aCount, aCountRead);
+  // Check if all data has been read
+  if (mStatus == NS_BASE_STREAM_CLOSED) {
+    return NS_OK;
+  }
+
+  // Check whenever any error appears while reading
+  return mStatus;
+}
+
+NS_IMETHODIMP
+nsGIOInputStream::ReadSegments(nsWriteSegmentFun aWriter, void* aClosure,
+                               uint32_t aCount, uint32_t* aResult) {
+  // There is no way to implement this using GnomeVFS, but fortunately
+  // that doesn't matter.  Because we are a blocking input stream, Necko
+  // isn't going to call our ReadSegments method.
+  MOZ_ASSERT_UNREACHABLE("nsGIOInputStream::ReadSegments");
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsGIOInputStream::IsNonBlocking(bool* aResult) {
+  *aResult = false;
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+
+/**
+ * Called when finishing mount operation. Result of operation is set in
+ * nsGIOInputStream. This function is called in main thread as an async request
+ * typically from dbus.
+ * @param source_object GFile object which requested the mount
+ * @param res result object
+ * @param user_data pointer to nsGIOInputStream
+ */
+static void mount_enclosing_volume_finished(GObject* source_object,
+                                            GAsyncResult* res,
+                                            gpointer user_data) {
+  GError* error = nullptr;
+
+  nsGIOInputStream* istream = static_cast<nsGIOInputStream*>(user_data);
+
+  g_file_mount_enclosing_volume_finish(G_FILE(source_object), res, &error);
+
+  if (error) {
+    g_warning("Mount failed: %s %d", error->message, error->code);
+    istream->SetMountResult(MountOperationResult::MOUNT_OPERATION_FAILED,
+                            error->code);
+    g_error_free(error);
+  } else {
+    istream->SetMountResult(MountOperationResult::MOUNT_OPERATION_SUCCESS, 0);
+  }
+}
+
+/**
+ * This function is called when username or password are requested from user.
+ * This function is called in main thread as async request from dbus.
+ * @param mount_op mount operation
+ * @param message message to show to user
+ * @param default_user preffered user
+ * @param default_domain domain name
+ * @param flags what type of information is required
+ * @param user_data nsIChannel
+ */
+static void mount_operation_ask_password(
+    GMountOperation* mount_op, const char* message, const char* default_user,
+    const char* default_domain, GAskPasswordFlags flags, gpointer user_data) {
+  nsIChannel* channel = (nsIChannel*)user_data;
+  if (!channel) {
+    g_mount_operation_reply(mount_op, G_MOUNT_OPERATION_ABORTED);
+    return;
+  }
+  // We can't handle request for domain
+  if (flags & G_ASK_PASSWORD_NEED_DOMAIN) {
+    g_mount_operation_reply(mount_op, G_MOUNT_OPERATION_ABORTED);
+    return;
+  }
+
+  nsCOMPtr<nsIAuthPrompt> prompt;
+  NS_QueryNotificationCallbacks(channel, prompt);
+
+  // If no auth prompt, then give up.  We could failover to using the
+  // WindowWatcher service, but that might defeat a consumer's purposeful
+  // attempt to disable authentication (for whatever reason).
+  if (!prompt) {
+    g_mount_operation_reply(mount_op, G_MOUNT_OPERATION_ABORTED);
+    return;
+  }
+  // Parse out the host and port...
+  nsCOMPtr<nsIURI> uri;
+  channel->GetURI(getter_AddRefs(uri));
+  if (!uri) {
+    g_mount_operation_reply(mount_op, G_MOUNT_OPERATION_ABORTED);
+    return;
+  }
+
+  nsAutoCString scheme, hostPort;
+  uri->GetScheme(scheme);
+  uri->GetHostPort(hostPort);
+
+  // It doesn't make sense for either of these strings to be empty.  What kind
+  // of funky URI is this?
+  if (scheme.IsEmpty() || hostPort.IsEmpty()) {
+    g_mount_operation_reply(mount_op, G_MOUNT_OPERATION_ABORTED);
+    return;
+  }
+  // Construct the single signon key.  Altering the value of this key will
+  // cause people's remembered passwords to be forgotten.  Think carefully
+  // before changing the way this key is constructed.
+  nsAutoString key, realm;
+
+  NS_ConvertUTF8toUTF16 dispHost(scheme);
+  dispHost.AppendLiteral("://");
+  dispHost.Append(NS_ConvertUTF8toUTF16(hostPort));
+
+  key = dispHost;
+  if (*default_domain != '\0') {
+    // We assume the realm string is ASCII.  That might be a bogus assumption,
+    // but we have no idea what encoding GnomeVFS is using, so for now we'll
+    // limit ourselves to ISO-Latin-1.  XXX What is a better solution?
+    realm.Append('"');
+    realm.Append(NS_ConvertASCIItoUTF16(default_domain));
+    realm.Append('"');
+    key.Append(' ');
+    key.Append(realm);
+  }
+  // Construct the message string...
+  //
+  // We use Necko's string bundle here.  This code really should be encapsulated
+  // behind some Necko API, after all this code is based closely on the code in
+  // nsHttpChannel.cpp.
+  nsCOMPtr<nsIStringBundleService> bundleSvc =
+      do_GetService(NS_STRINGBUNDLE_CONTRACTID);
+  if (!bundleSvc) {
+    g_mount_operation_reply(mount_op, G_MOUNT_OPERATION_ABORTED);
+    return;
+  }
+  nsCOMPtr<nsIStringBundle> bundle;
+  bundleSvc->CreateBundle("chrome://global/locale/commonDialogs.properties",
+                          getter_AddRefs(bundle));
+  if (!bundle) {
+    g_mount_operation_reply(mount_op, G_MOUNT_OPERATION_ABORTED);
+    return;
+  }
+  nsAutoString nsmessage;
+
+  if (flags & G_ASK_PASSWORD_NEED_PASSWORD) {
+    if (flags & G_ASK_PASSWORD_NEED_USERNAME) {
+      if (!realm.IsEmpty()) {
+        AutoTArray<nsString, 2> strings = {realm, dispHost};
+        bundle->FormatStringFromName("EnterLoginForRealm3", strings, nsmessage);
+      } else {
+        AutoTArray<nsString, 1> strings = {dispHost};
+        bundle->FormatStringFromName("EnterUserPasswordFor2", strings,
+                                     nsmessage);
+      }
+    } else {
+      NS_ConvertUTF8toUTF16 userName(default_user);
+      AutoTArray<nsString, 2> strings = {userName, dispHost};
+      bundle->FormatStringFromName("EnterPasswordFor", strings, nsmessage);
+    }
+  } else {
+    g_warning("Unknown mount operation request (flags: %x)", flags);
+  }
+
+  if (nsmessage.IsEmpty()) {
+    g_mount_operation_reply(mount_op, G_MOUNT_OPERATION_ABORTED);
+    return;
+  }
+  // Prompt the user...
+  nsresult rv;
+  bool retval = false;
+  char16_t *user = nullptr, *pass = nullptr;
+  if (default_user) {
+    // user will be freed by PromptUsernameAndPassword
+    user = ToNewUnicode(NS_ConvertUTF8toUTF16(default_user));
+  }
+  if (flags & G_ASK_PASSWORD_NEED_USERNAME) {
+    rv = prompt->PromptUsernameAndPassword(
+        nullptr, nsmessage.get(), key.get(),
+        nsIAuthPrompt::SAVE_PASSWORD_PERMANENTLY, &user, &pass, &retval);
+  } else {
+    rv = prompt->PromptPassword(nullptr, nsmessage.get(), key.get(),
+                                nsIAuthPrompt::SAVE_PASSWORD_PERMANENTLY, &pass,
+                                &retval);
+  }
+  if (NS_FAILED(rv) || !retval) {  //  was || user == '\0' || pass == '\0'
+    g_mount_operation_reply(mount_op, G_MOUNT_OPERATION_ABORTED);
+    free(user);
+    free(pass);
+    return;
+  }
+  /* GIO should accept UTF8 */
+  g_mount_operation_set_username(mount_op, NS_ConvertUTF16toUTF8(user).get());
+  g_mount_operation_set_password(mount_op, NS_ConvertUTF16toUTF8(pass).get());
+  free(user);
+  free(pass);
+  g_mount_operation_reply(mount_op, G_MOUNT_OPERATION_HANDLED);
+}
+
+//-----------------------------------------------------------------------------
+
+mozilla::StaticRefPtr<nsGIOProtocolHandler> nsGIOProtocolHandler::sSingleton;
+
+already_AddRefed<nsGIOProtocolHandler> nsGIOProtocolHandler::GetSingleton() {
+  if (!sSingleton) {
+    sSingleton = new nsGIOProtocolHandler();
+    sSingleton->Init();
+    ClearOnShutdown(&sSingleton);
+  }
+  return do_AddRef(sSingleton);
+}
+
+NS_IMPL_ISUPPORTS(nsGIOProtocolHandler, nsIProtocolHandler, nsIObserver)
+
+nsresult nsGIOProtocolHandler::Init() {
+  if (net::IsNeckoChild()) {
+    net::NeckoChild::InitNeckoChild();
+  }
+  nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
+  if (prefs) {
+    InitSupportedProtocolsPref(prefs);
+    prefs->AddObserver(MOZ_GIO_SUPPORTED_PROTOCOLS, this, false);
+  }
+
+  return NS_OK;
+}
+
+void nsGIOProtocolHandler::InitSupportedProtocolsPref(nsIPrefBranch* prefs) {
+  nsCOMPtr<nsIIOService> ioService = components::IO::Service();
+  if (NS_WARN_IF(!ioService)) {
+    LOG(("gio: ioservice not available\n"));
+    return;
+  }
+
+  // Get user preferences to determine which protocol is supported.
+  // Gvfs/GIO has a set of supported protocols like obex, network, archive,
+  // computer, dav, cdda, gphoto2, trash, etc. Some of these seems to be
+  // irrelevant to process by browser. By default accept only sftp protocol so
+  // far.
+  nsAutoCString prefValue;
+  nsresult rv = prefs->GetCharPref(MOZ_GIO_SUPPORTED_PROTOCOLS, prefValue);
+  if (NS_SUCCEEDED(rv)) {
+    prefValue.StripWhitespace();
+    ToLowerCase(prefValue);
+  } else {
+    prefValue.AssignLiteral(
+#ifdef MOZ_PROXY_BYPASS_PROTECTION
+        ""  // use none
+#else
+        "sftp:"  // use defaults (comma separated list)
+#endif
+    );
+  }
+  LOG(("gio: supported protocols \"%s\"\n", prefValue.get()));
+
+  // Unregister any previously registered dynamic protocols.
+  for (const nsCString& scheme : mSupportedProtocols) {
+    LOG(("gio: unregistering handler for \"%s\"", scheme.get()));
+    ioService->UnregisterProtocolHandler(scheme);
+  }
+  mSupportedProtocols.Clear();
+
+  // Register each protocol from the pref branch to reference
+  // nsGIOProtocolHandler.
+  for (const nsDependentCSubstring& protocol : prefValue.Split(',')) {
+    if (NS_WARN_IF(!StringEndsWith(protocol, ":"_ns))) {
+      continue;  // each protocol must end with a `:` character to be recognized
+    }
+
+    nsCString scheme(Substring(protocol, 0, protocol.Length() - 1));
+    if (NS_SUCCEEDED(ioService->RegisterProtocolHandler(
+            scheme, this,
+            nsIProtocolHandler::URI_STD |
+                nsIProtocolHandler::URI_DANGEROUS_TO_LOAD,
+            /* aDefaultPort */ -1))) {
+      LOG(("gio: successfully registered handler for \"%s\"", scheme.get()));
+      mSupportedProtocols.AppendElement(scheme);
+    } else {
+      LOG(("gio: failed to register handler for \"%s\"", scheme.get()));
+    }
+  }
+}
+
+bool nsGIOProtocolHandler::IsSupportedProtocol(const nsCString& aScheme) {
+  for (const auto& protocol : mSupportedProtocols) {
+    if (aScheme.EqualsIgnoreCase(protocol)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+NS_IMETHODIMP
+nsGIOProtocolHandler::GetScheme(nsACString& aScheme) {
+  aScheme.AssignLiteral(MOZ_GIO_SCHEME);
+  return NS_OK;
+}
+
+static bool IsValidGIOScheme(const nsACString& aScheme) {
+  // Verify that GIO supports this URI scheme.
+  GVfs* gvfs = g_vfs_get_default();
+
+  if (!gvfs) {
+    g_warning("Cannot get GVfs object.");
+    return false;
+  }
+
+  const gchar* const* uri_schemes = g_vfs_get_supported_uri_schemes(gvfs);
+
+  while (*uri_schemes != nullptr) {
+    // While flatSpec ends with ':' the uri_scheme does not. Therefore do not
+    // compare last character.
+    if (aScheme.Equals(*uri_schemes)) {
+      return true;
+    }
+    uri_schemes++;
+  }
+
+  return false;
+}
+
+NS_IMETHODIMP
+nsGIOProtocolHandler::NewChannel(nsIURI* aURI, nsILoadInfo* aLoadInfo,
+                                 nsIChannel** aResult) {
+  NS_ENSURE_ARG_POINTER(aURI);
+  nsresult rv;
+
+  nsAutoCString spec;
+  rv = aURI->GetSpec(spec);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  nsAutoCString scheme;
+  rv = aURI->GetScheme(scheme);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  if (!IsSupportedProtocol(scheme)) {
+    return NS_ERROR_UNKNOWN_PROTOCOL;
+  }
+
+  // g_vfs_get_supported_uri_schemes() returns a very limited list in the
+  // child due to the sandbox, so we only check if its valid for the parent.
+  if (XRE_IsParentProcess() && !IsValidGIOScheme(scheme)) {
+    return NS_ERROR_UNKNOWN_PROTOCOL;
+  }
+
+  RefPtr<nsBaseChannel> channel;
+  if (net::IsNeckoChild()) {
+    channel = new mozilla::net::GIOChannelChild(aURI);
+    // set the loadInfo on the new channel
+    channel->SetLoadInfo(aLoadInfo);
+
+    rv = channel->SetContentType(nsLiteralCString(UNKNOWN_CONTENT_TYPE));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    channel.forget(aResult);
+    return NS_OK;
+  }
+
+  RefPtr<nsGIOInputStream> stream = new nsGIOInputStream(spec);
+  if (!stream) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  RefPtr<nsGIOInputStream> tmpStream = stream;
+  rv = NS_NewInputStreamChannelInternal(aResult, aURI, tmpStream.forget(),
+                                        nsLiteralCString(UNKNOWN_CONTENT_TYPE),
+                                        ""_ns,  // aContentCharset
+                                        aLoadInfo);
+  if (NS_SUCCEEDED(rv)) {
+    stream->SetChannel(*aResult);
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsGIOProtocolHandler::AllowPort(int32_t aPort, const char* aScheme,
+                                bool* aResult) {
+  // Don't override anything.
+  *aResult = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOProtocolHandler::Observe(nsISupports* aSubject, const char* aTopic,
+                              const char16_t* aData) {
+  if (strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID) == 0) {
+    nsCOMPtr<nsIPrefBranch> prefs = do_QueryInterface(aSubject);
+    InitSupportedProtocolsPref(prefs);
+  }
+  return NS_OK;
+}
diff --git a/netwerk/protocol/gio/nsGIOProtocolHandler.h b/netwerk/protocol/gio/nsGIOProtocolHandler.h
new file mode 100644
index 0000000000..08e7c01bed
--- /dev/null
+++ b/netwerk/protocol/gio/nsGIOProtocolHandler.h
@@ -0,0 +1,38 @@
+/* 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/. */
+
+#ifndef nsGIOProtocolHandler_h___
+#define nsGIOProtocolHandler_h___
+
+#include "nsIProtocolHandler.h"
+#include "nsIObserver.h"
+#include "nsIPrefBranch.h"
+#include "nsStringFwd.h"
+
+#include "mozilla/Logging.h"
+extern mozilla::LazyLogModule gGIOLog;
+
+class nsGIOProtocolHandler final : public nsIProtocolHandler,
+                                   public nsIObserver {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIPROTOCOLHANDLER
+  NS_DECL_NSIOBSERVER
+
+  static already_AddRefed<nsGIOProtocolHandler> GetSingleton();
+  bool IsSupportedProtocol(const nsCString& aScheme);
+
+ protected:
+  ~nsGIOProtocolHandler() = default;
+
+ private:
+  nsresult Init();
+
+  void InitSupportedProtocolsPref(nsIPrefBranch* prefs);
+
+  static mozilla::StaticRefPtr<nsGIOProtocolHandler> sSingleton;
+  nsTArray<nsCString> mSupportedProtocols;
+};
+
+#endif  // nsGIOProtocolHandler_h___