Add m-esr52 at 52.6.0

1 files changed, 1131 insertions, 0 deletions

diff --git a/extensions/gio/nsGIOProtocolHandler.cpp b/extensions/gio/nsGIOProtocolHandler.cpp
new file mode 100644
index 000000000..a378e8700
--- /dev/null
+++ b/extensions/gio/nsGIOProtocolHandler.cpp
@@ -0,0 +1,1131 @@
+/* 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 "mozilla/ModuleUtils.h"
+#include "nsIPrefService.h"
+#include "nsIPrefBranch.h"
+#include "nsIObserver.h"
+#include "nsThreadUtils.h"
+#include "nsProxyRelease.h"
+#include "nsIStringBundle.h"
+#include "nsIStandardURL.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 "nsNullPrincipal.h"
+#include "mozilla/Monitor.h"
+#include "plstr.h"
+#include "prtime.h"
+#include <gio/gio.h>
+#include <algorithm>
+
+#define MOZ_GIO_SCHEME              "moz-gio"
+#define MOZ_GIO_SUPPORTED_PROTOCOLS "network.gio.supported-protocols"
+
+//-----------------------------------------------------------------------------
+
+// NSPR_LOG_MODULES=gio:5
+static mozilla::LazyLogModule sGIOLog("gio");
+#define LOG(args) MOZ_LOG(sGIOLog, 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;
+  }
+
+  return NS_ERROR_FAILURE;
+}
+
+static nsresult
+MapGIOResult(GError *result)
+{
+  if (!result)
+    return NS_OK;
+  else 
+    return MapGIOResult(result->code);
+}
+/** Return values for mount operation.
+ * These enums are used as mount operation return values.
+ */
+typedef enum {
+  MOUNT_OPERATION_IN_PROGRESS, /** \enum operation in progress */
+  MOUNT_OPERATION_SUCCESS,     /** \enum operation successful */
+  MOUNT_OPERATION_FAILED       /** \enum operation not successful */
+} MountOperationResult;
+//-----------------------------------------------------------------------------
+/**
+ * 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 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
+{
+   ~nsGIOInputStream() { Close(); }
+
+  public:
+    NS_DECL_THREADSAFE_ISUPPORTS
+    NS_DECL_NSIINPUTSTREAM
+
+    explicit nsGIOInputStream(const nsCString &uriSpec)
+      : mSpec(uriSpec)
+      , mChannel(nullptr)
+      , mHandle(nullptr)
+      , mStream(nullptr)
+      , mBytesRemaining(UINT64_MAX)
+      , mStatus(NS_OK)
+      , mDirList(nullptr)
+      , mDirListPtr(nullptr)
+      , mDirBufCursor(0)
+      , mDirOpen(false)
+      , mMonitorMountInProgress("GIOInputStream::MountFinished") { }
+
+    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.
+
+      NS_ADDREF(mChannel = channel);
+    }
+    void           SetMountResult(MountOperationResult result, gint error_code);
+  private:
+    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; // manually refcounted
+    GFile                *mHandle;
+    GFileInputStream     *mStream;
+    uint64_t              mBytesRemaining;
+    nsresult              mStatus;
+    GList                *mDirList;
+    GList                *mDirListPtr;
+    nsCString             mDirBuf;
+    uint32_t              mDirBufCursor;
+    bool                  mDirOpen;
+    MountOperationResult  mMountRes;
+    mozilla::Monitor      mMonitorMountInProgress;
+    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 = 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 == MOUNT_OPERATION_IN_PROGRESS)
+    mon.Wait();
+  
+  g_object_unref(mount_op);
+
+  if (mMountRes == MOUNT_OPERATION_FAILED) {
+    return MapGIOResult(mMountErrorCode);
+  } else {
+    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;
+  }
+  else 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)
+      : 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(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;
+}
+
+/**
+ * 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.
+  NS_NOTREACHED("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(MOUNT_OPERATION_FAILED, error->code);
+    g_error_free(error);
+  } else {
+    istream->SetMountResult(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()) {
+        const char16_t *strings[] = { realm.get(), dispHost.get() };
+        bundle->FormatStringFromName(u"EnterLoginForRealm3",
+                                     strings, 2, getter_Copies(nsmessage));
+      } else {
+        const char16_t *strings[] = { dispHost.get() };
+        bundle->FormatStringFromName(u"EnterUserPasswordFor2",
+                                     strings, 1, getter_Copies(nsmessage));
+      }
+    } else {
+      NS_ConvertUTF8toUTF16 userName(default_user);
+      const char16_t *strings[] = { userName.get(), dispHost.get() };
+      bundle->FormatStringFromName(u"EnterPasswordFor",
+                                   strings, 2, getter_Copies(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);
+}
+
+//-----------------------------------------------------------------------------
+
+class nsGIOProtocolHandler final : public nsIProtocolHandler
+                                 , public nsIObserver
+{
+  public:
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIPROTOCOLHANDLER
+    NS_DECL_NSIOBSERVER
+
+    nsresult Init();
+
+  private:
+    ~nsGIOProtocolHandler() {}
+
+    void InitSupportedProtocolsPref(nsIPrefBranch *prefs);
+    bool IsSupportedProtocol(const nsCString &spec);
+
+    nsCString mSupportedProtocols;
+};
+
+NS_IMPL_ISUPPORTS(nsGIOProtocolHandler, nsIProtocolHandler, nsIObserver)
+
+nsresult
+nsGIOProtocolHandler::Init()
+{
+  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)
+{
+  // 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 smb and sftp
+  // protocols so far.
+  nsresult rv = prefs->GetCharPref(MOZ_GIO_SUPPORTED_PROTOCOLS,
+                                   getter_Copies(mSupportedProtocols));
+  if (NS_SUCCEEDED(rv)) {
+    mSupportedProtocols.StripWhitespace();
+    ToLowerCase(mSupportedProtocols);
+  }
+  else
+    mSupportedProtocols.AssignLiteral("smb:,sftp:"); // use defaults
+
+  LOG(("gio: supported protocols \"%s\"\n", mSupportedProtocols.get()));
+}
+
+bool
+nsGIOProtocolHandler::IsSupportedProtocol(const nsCString &aSpec)
+{
+  const char *specString = aSpec.get();
+  const char *colon = strchr(specString, ':');
+  if (!colon)
+    return false;
+
+  uint32_t length = colon - specString + 1;
+
+  // <scheme> + ':'
+  nsCString scheme(specString, length);
+
+  char *found = PL_strcasestr(mSupportedProtocols.get(), scheme.get());
+  if (!found)
+    return false;
+
+  if (found[length] != ',' && found[length] != '\0')
+    return false;
+
+  return true;
+}
+
+NS_IMETHODIMP
+nsGIOProtocolHandler::GetScheme(nsACString &aScheme)
+{
+  aScheme.Assign(MOZ_GIO_SCHEME);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOProtocolHandler::GetDefaultPort(int32_t *aDefaultPort)
+{
+  *aDefaultPort = -1;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOProtocolHandler::GetProtocolFlags(uint32_t *aProtocolFlags)
+{
+  // Is URI_STD true of all GnomeVFS URI types?
+  *aProtocolFlags = URI_STD | URI_DANGEROUS_TO_LOAD;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsGIOProtocolHandler::NewURI(const nsACString &aSpec,
+                             const char *aOriginCharset,
+                             nsIURI *aBaseURI,
+                             nsIURI **aResult)
+{
+  const nsCString flatSpec(aSpec);
+  LOG(("gio: NewURI [spec=%s]\n", flatSpec.get()));
+
+  if (!aBaseURI)
+  {
+    // XXX Is it good to support all GIO protocols?
+    if (!IsSupportedProtocol(flatSpec))
+      return NS_ERROR_UNKNOWN_PROTOCOL;
+
+    int32_t colon_location = flatSpec.FindChar(':');
+    if (colon_location <= 0)
+      return NS_ERROR_UNKNOWN_PROTOCOL;
+
+    // Verify that GIO supports this URI scheme.
+    bool uri_scheme_supported = false;
+
+    GVfs *gvfs = g_vfs_get_default();
+
+    if (!gvfs) {
+      g_warning("Cannot get GVfs object.");
+      return NS_ERROR_UNKNOWN_PROTOCOL;
+    }
+
+    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 (StringHead(flatSpec, colon_location).Equals(*uri_schemes)) {
+        uri_scheme_supported = true;
+        break;
+      }
+      uri_schemes++;
+    }
+
+    if (!uri_scheme_supported) {
+      return NS_ERROR_UNKNOWN_PROTOCOL;
+    }
+  }
+
+  nsresult rv;
+  nsCOMPtr<nsIStandardURL> url =
+      do_CreateInstance(NS_STANDARDURL_CONTRACTID, &rv);
+  if (NS_FAILED(rv))
+    return rv;
+
+  rv = url->Init(nsIStandardURL::URLTYPE_STANDARD, -1, flatSpec,
+                 aOriginCharset, aBaseURI);
+  if (NS_SUCCEEDED(rv))
+    rv = CallQueryInterface(url, aResult);
+  return rv;
+
+}
+
+NS_IMETHODIMP
+nsGIOProtocolHandler::NewChannel2(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;
+
+  RefPtr<nsGIOInputStream> stream = new nsGIOInputStream(spec);
+  if (!stream) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  rv = NS_NewInputStreamChannelInternal(aResult,
+                                        aURI,
+                                        stream,
+                                        NS_LITERAL_CSTRING(UNKNOWN_CONTENT_TYPE),
+                                        EmptyCString(), // aContentCharset
+                                        aLoadInfo);
+  if (NS_SUCCEEDED(rv)) {
+    stream->SetChannel(*aResult);
+  }
+  return rv;
+}
+
+NS_IMETHODIMP
+nsGIOProtocolHandler::NewChannel(nsIURI *aURI, nsIChannel **aResult)
+{
+    return NewChannel2(aURI, nullptr, aResult);
+}
+
+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;
+}
+
+//-----------------------------------------------------------------------------
+
+#define NS_GIOPROTOCOLHANDLER_CID                    \
+{ /* ee706783-3af8-4d19-9e84-e2ebfe213480 */         \
+    0xee706783,                                      \
+    0x3af8,                                          \
+    0x4d19,                                          \
+    {0x9e, 0x84, 0xe2, 0xeb, 0xfe, 0x21, 0x34, 0x80} \
+}
+
+NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsGIOProtocolHandler, Init)
+NS_DEFINE_NAMED_CID(NS_GIOPROTOCOLHANDLER_CID);
+
+static const mozilla::Module::CIDEntry kVFSCIDs[] = {
+  { &kNS_GIOPROTOCOLHANDLER_CID, false, nullptr, nsGIOProtocolHandlerConstructor },
+  { nullptr }
+};
+
+static const mozilla::Module::ContractIDEntry kVFSContracts[] = {
+  { NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX MOZ_GIO_SCHEME, &kNS_GIOPROTOCOLHANDLER_CID },
+  { nullptr }
+};
+
+static const mozilla::Module kVFSModule = {
+  mozilla::Module::kVersion,
+  kVFSCIDs,
+  kVFSContracts
+};
+
+NSMODULE_DEFN(nsGIOModule) = &kVFSModule;