extensions/gio/nsGIOProtocolHandler.cpp
author Carsten "Tomcat" Book <cbook@mozilla.com>
Tue, 02 Jun 2015 13:05:56 +0200
changeset 246724 3c8ed81098ddbe4a4c09e7aa652b5288dc4ce0d3
parent 246699 7c3b45a47811b55f4e973d996dd149c5d575721b
child 247076 f52c18aac7ce0949190da943ec5d4ee86627d0f8
permissions -rw-r--r--
Backed out 14 changesets (bug 1165515) for linux x64 e10s m2 test failures Backed out changeset d68dcf2ef372 (bug 1165515) Backed out changeset 7c3b45a47811 (bug 1165515) Backed out changeset b668b617bef2 (bug 1165515) Backed out changeset d0916e1283a2 (bug 1165515) Backed out changeset ac4dc7489942 (bug 1165515) Backed out changeset e9632ce8bc65 (bug 1165515) Backed out changeset c16d215cc7e4 (bug 1165515) Backed out changeset e4d474f3c51a (bug 1165515) Backed out changeset d87680bf9f7c (bug 1165515) Backed out changeset b3c0a45ba99e (bug 1165515) Backed out changeset 9370fa197674 (bug 1165515) Backed out changeset 50970d668ca1 (bug 1165515) Backed out changeset ffa4eb6d24b9 (bug 1165515) Backed out changeset 5fcf1203cc1d (bug 1165515)

/* 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 "nsNetUtil.h"
#include "nsNullPrincipal.h"
#include "mozilla/Monitor.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 PRLogModuleInfo *sGIOLog;
#define LOG(args) MOZ_LOG(sGIOLog, PR_LOG_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 nsRunnable
{
  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()
    {
      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)
  {
    nsresult rv = NS_OK;

    nsCOMPtr<nsIThread> thread = do_GetMainThread();
    if (thread)
      rv = NS_ProxyRelease(thread, mChannel);

    NS_ASSERTION(thread && NS_SUCCEEDED(rv), "leaking channel reference");
    mChannel = nullptr;
    (void) rv;
  }

  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(MOZ_UTF16("EnterLoginForRealm"),
                                     strings, 2, getter_Copies(nsmessage));
      } else {
        const char16_t *strings[] = { dispHost.get() };
        bundle->FormatStringFromName(MOZ_UTF16("EnterUserPasswordFor"),
                                     strings, 1, getter_Copies(nsmessage));
      }
    } else {
      NS_ConvertUTF8toUTF16 userName(default_user);
      const char16_t *strings[] = { userName.get(), dispHost.get() };
      bundle->FormatStringFromName(MOZ_UTF16("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);
    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()
{
  sGIOLog = PR_NewLogModule("gio");

  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;

  nsRefPtr<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;