path: root/lib/ephy-file-helpers.c

/*
 *  Copyright (C) 2002 Jorn Baayen
 *  Copyright (C) 2003, 2004 Marco Pesenti Gritti
 *  Copyright (C) 2004, 2005, 2006 Christian Persch
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 *  $Id$
 */

#include "config.h"

#include "ephy-file-helpers.h"

#include "ephy-prefs.h"
#include "eel-gconf-extensions.h"
#include "ephy-debug.h"

#include <glib.h>
#include <glib/gi18n.h>
#include <libgnome/gnome-init.h>
#include <libgnomevfs/gnome-vfs-utils.h>
#include <libgnomevfs/gnome-vfs-file-info.h>
#include <libgnomevfs/gnome-vfs-ops.h>
#include <libxml/xmlreader.h>

/* bug http://bugzilla.gnome.org/show_bug.cgi?id=156687 */
#undef GNOME_DISABLE_DEPRECATED
#include <libgnome/gnome-desktop-item.h>

#define SN_API_NOT_YET_FROZEN
#include <libsn/sn.h>
#include <gdk/gdk.h>
#include <gdk/gdkx.h>

#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>

#define EPHY_UUID       "0d82d98f-7079-401c-abff-203fcde1ece3"
#define EPHY_UUID_ENVVAR    "EPHY_UNIQUE"
#define EPHY_UUID_ENVSTRING EPHY_UUID_ENVVAR "=" EPHY_UUID

#define DELAY_MAX_TICKS 64
#define INITIAL_TICKS   2

static GHashTable *files = NULL;
static GHashTable *mime_table = NULL;

static gboolean have_private_profile = FALSE;
static gboolean delete_profile_on_exit = FALSE;
static char *dot_dir = NULL;
static char *tmp_dir = NULL;
static GList *del_on_exit = NULL;

GQuark ephy_file_helpers_error_quark;

const char *
ephy_file_tmp_dir (void)
{
    if (tmp_dir == NULL)
    {
        char *partial_name;
        char *full_name;

        partial_name = g_strconcat ("epiphany-", g_get_user_name (),
                        "-XXXXXX", NULL);
        full_name = g_build_filename (g_get_tmp_dir (), partial_name,
                          NULL);
#ifdef HAVE_MKDTEMP
        tmp_dir = mkdtemp (full_name);
#else
#error no mkdtemp implementation
#endif
        g_free (partial_name);

        if (tmp_dir == NULL)
        {
            g_free (full_name);
        }
    }

    return tmp_dir;
}

char *
ephy_file_downloads_dir (void)
{
    const char *translated_folder;
    char *desktop_dir, *converted, *downloads_dir;

    /* The name of the default downloads folder */
    translated_folder = _("Downloads");

    converted = g_filename_from_utf8 (translated_folder, -1, NULL, 
                      NULL, NULL);

    desktop_dir = ephy_file_desktop_dir ();
    downloads_dir = g_build_filename (desktop_dir, converted, NULL);

    g_free (desktop_dir);
    g_free (converted);

    return downloads_dir;
}

char *
ephy_file_get_downloads_dir (void)
{
    char *download_dir, *expanded;

    download_dir = eel_gconf_get_string (CONF_STATE_DOWNLOAD_DIR);

    if (download_dir && strcmp (download_dir, "Downloads") == 0)
    {
        g_free (download_dir);
        download_dir = ephy_file_downloads_dir ();
    }
    else if (download_dir && strcmp (download_dir, "Desktop") == 0)
    {
        g_free (download_dir);
        download_dir = ephy_file_desktop_dir ();
    }  
    else if (download_dir)
    {
        char *converted_dp;

        converted_dp = g_filename_from_utf8 (download_dir, -1, NULL, NULL, NULL);
        g_free (download_dir);
        download_dir = converted_dp;
    }

    /* Emergency download destination */
    if (download_dir == NULL)
    {
        const char *home_dir;
        home_dir = g_get_home_dir ();
        download_dir = g_strdup (home_dir != NULL ? home_dir : "/");
    }

    g_return_val_if_fail (download_dir != NULL, NULL);

    expanded = gnome_vfs_expand_initial_tilde (download_dir);
    g_free (download_dir);

    return expanded;
}

char *
ephy_file_desktop_dir (void)
{
    char *downloads_dir;
    gboolean desktop_is_home;

    desktop_is_home = eel_gconf_get_boolean (CONF_DESKTOP_IS_HOME_DIR);

    if (desktop_is_home)
    {
        downloads_dir = g_strdup (g_get_home_dir ()); 
    }
    else
    {
        downloads_dir = g_build_filename
            (g_get_home_dir (), "Desktop", NULL);
    }

    return downloads_dir;
}

char *
ephy_file_tmp_filename (const char *base,
            const char *extension)
{
    int fd;
    char *name = g_strdup (base);

    fd = mkstemp (name);

    if (fd != -1)
    {
        unlink (name);
        close (fd);
    }
    else
    {
        g_free (name);

        return NULL;
    }

    if (extension)
    {
        char *tmp;
        tmp = g_strconcat (name, ".",
                   extension, NULL);
        g_free (name);
        name = tmp;
    }

    return name;
}

const char *
ephy_file (const char *filename)
{
    char *ret;
    guint i;

    static const char * const paths[] =
    {
        SHARE_DIR "/",
        SHARE_DIR "/glade/",
        SHARE_DIR "/art/",
        SHARE_UNINSTALLED_DIR "/",
        SHARE_UNINSTALLED_DIR "/glade/",
        SHARE_UNINSTALLED_DIR "/art/"
    };

    g_assert (files != NULL);

    ret = g_hash_table_lookup (files, filename);
    if (ret != NULL)
        return ret;

    for (i = 0; i < G_N_ELEMENTS (paths); i++)
    {
        ret = g_strconcat (paths[i], filename, NULL);
        if (g_file_test (ret, G_FILE_TEST_EXISTS) == TRUE)
        {
            g_hash_table_insert (files, g_strdup (filename), ret);
            return (const char *) ret;
        }
        g_free (ret);
    }

    g_warning ("Failed to find %s\n", filename);

    return NULL;
}

const char *
ephy_dot_dir (void)
{
    return dot_dir;
}

gboolean
ephy_file_helpers_init (const char *profile_dir,
            gboolean private_profile,
            gboolean delete_profile,
            GError **error)
{
    const char *uuid;

    /* See if we've been calling ourself, and abort if we have */
    uuid = g_getenv (EPHY_UUID_ENVVAR);
    if (uuid && strcmp (uuid, EPHY_UUID) == 0)
    {
        g_warning ("Self call detected, exiting!\n");
        exit (1);
    }

    /* Put marker in env */
    g_setenv (EPHY_UUID_ENVVAR, EPHY_UUID, TRUE);

    ephy_file_helpers_error_quark = g_quark_from_static_string ("ephy-file-helpers-error");

    files = g_hash_table_new_full (g_str_hash,
                       g_str_equal,
                       (GDestroyNotify) g_free,
                       (GDestroyNotify) g_free);

    have_private_profile = private_profile;
    delete_profile_on_exit = delete_profile;

    if (private_profile && profile_dir != NULL)
    {
        dot_dir = g_strdup (profile_dir);
    }
    else if (private_profile)
    {
        if (ephy_file_tmp_dir () == NULL)
        {
            g_set_error (error,
                     EPHY_FILE_HELPERS_ERROR_QUARK,
                     0,
                     _("Could not create a temporary directory in “%s”."),
                     g_get_tmp_dir ());
            return FALSE;
        }

        dot_dir = g_build_filename (ephy_file_tmp_dir (),
                        "epiphany",
                        NULL);
    }
    else
    {
        dot_dir = g_build_filename (g_get_home_dir (),
                        GNOME_DOT_GNOME,
                        "epiphany",
                        NULL);
    }
    
    return ephy_ensure_dir_exists (ephy_dot_dir (), error);
}

static void
delete_files (GList *l)
{
    for (; l != NULL; l = l->next)
    {
        unlink (l->data);
    }
}

void
ephy_file_helpers_shutdown (void)
{
    g_hash_table_destroy (files);

    del_on_exit = g_list_reverse (del_on_exit);
    delete_files (del_on_exit);
    g_list_foreach (del_on_exit, (GFunc)g_free, NULL);
    g_list_free (del_on_exit);
    del_on_exit = NULL;

    if (mime_table != NULL)
    {
        LOG ("Destroying mime type hashtable");
        g_hash_table_destroy (mime_table);
        mime_table = NULL;
    }

    if (tmp_dir != NULL)
    {
        rmdir (tmp_dir);
        g_free (tmp_dir);
        tmp_dir = NULL;
    }

    g_free (dot_dir);
    dot_dir = NULL;
}

gboolean
ephy_ensure_dir_exists (const char *dir,
                GError **error)
{
    if (g_file_test (dir, G_FILE_TEST_EXISTS) &&
        !g_file_test (dir, G_FILE_TEST_IS_DIR))
    {
        g_set_error (error,
                 EPHY_FILE_HELPERS_ERROR_QUARK,
                 0,
                 _("The file “%s” exists. Please move it out of the way."),
                 dir);
        return FALSE;
    }

    if (!g_file_test (dir, G_FILE_TEST_EXISTS) &&
            mkdir (dir, 488) != 0)
    {
        g_set_error (error,
                 EPHY_FILE_HELPERS_ERROR_QUARK,
                 0,
                 _("Failed to create directory “%s”."),
                 dir);
        return FALSE;
    }

    return TRUE;
}

static void
ephy_find_file_recursive (const char *path,
              const char *fname,
              GSList **list,
              gint depth,
              gint maxdepth)
{
    GDir *dir;
    const gchar *file;

    dir = g_dir_open (path, 0, NULL);
    if (dir != NULL)
    {
        while ((file = g_dir_read_name (dir)))
        {
            if (depth < maxdepth)
            {
                char *new_path = g_build_filename (path, file, NULL);
                ephy_find_file_recursive (new_path, fname, list,
                              depth + 1, maxdepth);
                g_free (new_path);
            }
            if (strcmp (file, fname) == 0)
            {
                char *new_path = g_build_filename (path, file, NULL);
                *list = g_slist_prepend (*list, new_path);
            }
        }

        g_dir_close (dir);
    }
}

GSList *
ephy_file_find (const char *path,
            const char *fname,
            gint maxdepth)
{
    GSList *ret = NULL;
    ephy_find_file_recursive (path, fname, &ret, 0, maxdepth);
    return ret;
}

gboolean
ephy_file_switch_temp_file (const char *filename,
                const char *filename_temp)
{
    char *old_file;
    gboolean old_exist;
    gboolean retval = TRUE;

    old_file = g_strconcat (filename, ".old", NULL);

    old_exist = g_file_test (filename, G_FILE_TEST_EXISTS);

    if (old_exist)
    {
        if (rename (filename, old_file) < 0)
        {
            g_warning ("Failed to rename %s to %s", filename, old_file);
            retval = FALSE;
            goto failed;
        }
    }

    if (rename (filename_temp, filename) < 0)
    {
        g_warning ("Failed to rename %s to %s", filename_temp, filename);

        if (rename (old_file, filename) < 0)
        {
            g_warning ("Failed to restore %s from %s",
                   filename, filename_temp);
        }
        retval = FALSE;
        goto failed;
    }

    if (old_exist)
    {
        if (unlink (old_file) < 0)
        {
            g_warning ("Failed to delete old file %s", old_file);
        }
    }

failed:
    g_free (old_file);

    return retval;
}

void
ephy_file_delete_on_exit (const char *path)
{
    del_on_exit = g_list_prepend (del_on_exit,
                      g_strdup (path));
}

static void
load_mime_from_xml (void)
{
    xmlTextReaderPtr reader;
    const char *xml_file;
    int ret;
    EphyMimePermission permission = EPHY_MIME_PERMISSION_UNKNOWN;

    g_return_if_fail (mime_table == NULL);

    mime_table = g_hash_table_new_full (g_str_hash, g_str_equal,
                        xmlFree, NULL);

    xml_file = ephy_file ("mime-types-permissions.xml");
    if (xml_file == NULL)
    {
        g_warning ("MIME types permissions file not found!\n");
        return;
    }

    reader = xmlNewTextReaderFilename (xml_file);
    if (reader == NULL)
    {
        g_warning ("Could not load MIME types permissions file!\n");
        return;
    }

    ret = xmlTextReaderRead (reader);
    while (ret == 1)
    {
        const xmlChar *tag;
        xmlReaderTypes type;

        tag = xmlTextReaderConstName (reader);
        type = xmlTextReaderNodeType (reader);

        if (xmlStrEqual (tag, (const xmlChar *)"safe") && type == XML_READER_TYPE_ELEMENT)
        {
            permission = EPHY_MIME_PERMISSION_SAFE;
        }
        else if (xmlStrEqual (tag, (const xmlChar *)"unsafe") && type == XML_READER_TYPE_ELEMENT)
        {
            permission = EPHY_MIME_PERMISSION_UNSAFE;
        }
        else if (xmlStrEqual (tag, (const xmlChar *)"mime-type"))
        {
            xmlChar *type;

            type = xmlTextReaderGetAttribute (reader, (const xmlChar *)"type");
            g_hash_table_insert (mime_table, type,
                         GINT_TO_POINTER (permission));
        }

        ret = xmlTextReaderRead (reader);
    }

    xmlFreeTextReader (reader);
}

EphyMimePermission
ephy_file_check_mime (const char *mime_type)
{
    EphyMimePermission permission;
    gpointer tmp;

    g_return_val_if_fail (mime_type != NULL, EPHY_MIME_PERMISSION_UNKNOWN);

    if (mime_table == NULL)
    {
        load_mime_from_xml ();
    }

    tmp = g_hash_table_lookup (mime_table, mime_type);
    if (tmp == NULL)
    {
        permission = EPHY_MIME_PERMISSION_UNKNOWN;
    }
    else
    {
        permission = GPOINTER_TO_INT (tmp);
    }

    return permission;
}

/* Copied from nautilus-program-choosing.c */

extern char **environ;

/* Cut and paste from gdkspawn-x11.c */
static gchar **
my_gdk_spawn_make_environment_for_screen (GdkScreen  *screen,
                      gchar     **envp)
{
  gchar **retval = NULL;
  gchar  *display_name;
  gint    i, j = 0, env_len;

  g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);

  if (envp == NULL)
    envp = environ;

  env_len = g_strv_length (envp);
  retval = g_new (char *, env_len + 3);

  display_name = gdk_screen_make_display_name (screen);

  for (i = 0; envp[i] != NULL; i++)
    if (!g_str_has_prefix (envp[i], "DISPLAY=") &&
        !g_str_has_prefix (envp[i], EPHY_UUID_ENVVAR "="))
      retval[j++] = g_strdup (envp[i]);

  retval[j++] = g_strconcat ("DISPLAY=", display_name, NULL);
  retval[j++] = g_strdup (EPHY_UUID_ENVSTRING);
  retval[j] = NULL;

  g_free (display_name);

  return retval;
}

static void
sn_error_trap_push (SnDisplay *display,
            Display   *xdisplay)
{
    gdk_error_trap_push ();
}

static void
sn_error_trap_pop (SnDisplay *display,
           Display   *xdisplay)
{
    gdk_error_trap_pop ();
}

static char **
make_spawn_environment_for_sn_context (SnLauncherContext *sn_context,
                       char             **envp)
{
    char **retval;
    int    i, j, len;

    retval = NULL;
    
    if (envp == NULL) {
        envp = environ;
    }
    
    len = g_strv_length (envp);
    retval = g_new (char *, len + 3);

    for (i = 0, j = 0; envp[i] != NULL; i++) {
        if (!g_str_has_prefix (envp[i], "DESKTOP_STARTUP_ID=") &&
            !g_str_has_prefix (envp[i], EPHY_UUID_ENVVAR "=")) {
            retval[j++] = g_strdup (envp[i]);
            }
    }

    retval[j++] = g_strdup_printf ("DESKTOP_STARTUP_ID=%s",
                       sn_launcher_context_get_startup_id (sn_context));
    retval[j++] = g_strdup (EPHY_UUID_ENVSTRING);
    retval[j] = NULL;

    return retval;
}

/* This should be fairly long, as it's confusing to users if a startup
 * ends when it shouldn't (it appears that the startup failed, and
 * they have to relaunch the app). Also the timeout only matters when
 * there are bugs and apps don't end their own startup sequence.
 *
 * This timeout is a "last resort" timeout that ignores whether the
 * startup sequence has shown activity or not.  Metacity and the
 * tasklist have smarter, and correspondingly able-to-be-shorter
 * timeouts. The reason our timeout is dumb is that we don't monitor
 * the sequence (don't use an SnMonitorContext)
 */
#define STARTUP_TIMEOUT_LENGTH (30 /* seconds */ * 1000)

typedef struct
{
    GdkScreen *screen;
    GSList *contexts;
    guint timeout_id;
} StartupTimeoutData;

static void
free_startup_timeout (void *data)
{
    StartupTimeoutData *std;

    std = data;

    g_slist_foreach (std->contexts,
             (GFunc) sn_launcher_context_unref,
             NULL);
    g_slist_free (std->contexts);

    if (std->timeout_id != 0) {
        g_source_remove (std->timeout_id);
        std->timeout_id = 0;
    }

    g_free (std);
}

static gboolean
startup_timeout (void *data)
{
    StartupTimeoutData *std;
    GSList *tmp;
    GTimeVal now;
    int min_timeout;

    std = data;

    min_timeout = STARTUP_TIMEOUT_LENGTH;
    
    g_get_current_time (&now);
    
    tmp = std->contexts;
    while (tmp != NULL) {
        SnLauncherContext *sn_context;
        GSList *next;
        long tv_sec, tv_usec;
        double elapsed;
        
        sn_context = tmp->data;
        next = tmp->next;
        
        sn_launcher_context_get_last_active_time (sn_context,
                              &tv_sec, &tv_usec);

        elapsed =
            ((((double)now.tv_sec - tv_sec) * G_USEC_PER_SEC +
              (now.tv_usec - tv_usec))) / 1000.0;

        if (elapsed >= STARTUP_TIMEOUT_LENGTH) {
            std->contexts = g_slist_remove (std->contexts,
                            sn_context);
            sn_launcher_context_complete (sn_context);
            sn_launcher_context_unref (sn_context);
        } else {
            min_timeout = MIN (min_timeout, (STARTUP_TIMEOUT_LENGTH - elapsed));
        }
        
        tmp = next;
    }

    if (std->contexts == NULL) {
        std->timeout_id = 0;
    } else {
        std->timeout_id = g_timeout_add (min_timeout,
                         startup_timeout,
                         std);
    }

    /* always remove this one, but we may have reinstalled another one. */
    return FALSE;
}

static void
add_startup_timeout (GdkScreen         *screen,
             SnLauncherContext *sn_context)
{
    StartupTimeoutData *data;

    data = g_object_get_data (G_OBJECT (screen), "nautilus-startup-data");
    if (data == NULL) {
        data = g_new (StartupTimeoutData, 1);
        data->screen = screen;
        data->contexts = NULL;
        data->timeout_id = 0;
        
        g_object_set_data_full (G_OBJECT (screen), "nautilus-startup-data",
                    data, free_startup_timeout);        
    }

    sn_launcher_context_ref (sn_context);
    data->contexts = g_slist_prepend (data->contexts, sn_context);
    
    if (data->timeout_id == 0) {
        data->timeout_id = g_timeout_add (STARTUP_TIMEOUT_LENGTH,
                          startup_timeout,
                          data);        
    }
}

gboolean
ephy_file_launch_application (GnomeVFSMimeApplication *application,
                  const char *parameter,
                  guint32 user_time)
{
    GdkScreen       *screen;
    GList           *uris = NULL;
    char            *uri;
    char           **envp;
    GnomeVFSResult   result;
    SnLauncherContext *sn_context;
    SnDisplay *sn_display;

    g_return_val_if_fail (application != NULL, FALSE);
    g_return_val_if_fail (parameter != NULL, FALSE);

    uri = gnome_vfs_make_uri_canonical (parameter);
    if (uri == NULL) return FALSE;

    uris = g_list_prepend (NULL, uri);

    screen = gdk_screen_get_default ();
    envp = my_gdk_spawn_make_environment_for_screen (screen, NULL);
    
    sn_display = sn_display_new (gdk_display,
                     sn_error_trap_push,
                     sn_error_trap_pop);

    
    /* Only initiate notification if application supports it. */
    if (gnome_vfs_mime_application_supports_startup_notification (application))
    {
        char *name;

        sn_context = sn_launcher_context_new (sn_display,
                              screen ? gdk_screen_get_number (screen) :
                              DefaultScreen (gdk_display));
        
        name = g_filename_display_basename (uri);
        if (name != NULL) {
            char *description;
            
            sn_launcher_context_set_name (sn_context, name);

            /* FIXME: i18n after string freeze! */
            description = g_strdup_printf ("Opening %s", name);
            
            sn_launcher_context_set_description (sn_context, description);

            g_free (name);
            g_free (description);
        }
        
        if (!sn_launcher_context_get_initiated (sn_context)) {
            const char *binary_name;
            char **old_envp;

            binary_name = gnome_vfs_mime_application_get_binary_name (application);
        
            sn_launcher_context_set_binary_name (sn_context,
                                 binary_name);
            
            sn_launcher_context_initiate (sn_context,
                              g_get_prgname () ? g_get_prgname () : "unknown",
                              binary_name,
                              (Time) user_time);

            old_envp = envp;
            envp = make_spawn_environment_for_sn_context (sn_context, envp);
            g_strfreev (old_envp);
        }
    } else {
        sn_context = NULL;
    }
    
    result = gnome_vfs_mime_application_launch_with_env (application, uris, envp);

    if (sn_context != NULL) {
        if (result != GNOME_VFS_OK) {
            sn_launcher_context_complete (sn_context); /* end sequence */
        } else {
            add_startup_timeout (screen ? screen :
                         gdk_display_get_default_screen (gdk_display_get_default ()),
                         sn_context);
        }
        sn_launcher_context_unref (sn_context);
    }
    
    sn_display_unref (sn_display);

    g_strfreev (envp);
    g_list_foreach (uris, (GFunc) g_free,NULL);
    g_list_free (uris);

    if (result != GNOME_VFS_OK)
    {
        g_warning ("Cannot launch application '%s'\n",
               gnome_vfs_mime_application_get_name (application));
    }

    return result == GNOME_VFS_OK;
}

/* End cut-paste-adapt from nautilus */

static int
launch_desktop_item (const char *desktop_file,
             const char *parameter,
             guint32 user_time,
             GError **error)
{
    GnomeDesktopItem *item = NULL;
    GList *uris = NULL;
    char *canonical;
    int ret = -1;
    char *envp[2] = { EPHY_UUID_ENVSTRING, NULL };

    item = gnome_desktop_item_new_from_file (desktop_file, 0, NULL);
    if (item == NULL) return FALSE;
        
    if (parameter != NULL)
    {
        canonical = gnome_vfs_make_uri_canonical (parameter);
        uris = g_list_append (uris, canonical);
    }

    gnome_desktop_item_set_launch_time (item, user_time);
    ret = gnome_desktop_item_launch_with_env (item, uris, 0, envp, error);

    g_list_foreach (uris, (GFunc) g_free, NULL);
    g_list_free (uris);
    gnome_desktop_item_unref (item);

    return ret;
}

gboolean
ephy_file_launch_desktop_file (const char *filename,
                   guint32 user_time)
{
    GError *error = NULL;
    const char * const *dirs;
    char *path = NULL;
    int i, ret = -1;

    dirs = g_get_system_data_dirs ();
    if (dirs == NULL) return FALSE;

    for (i = 0; dirs[i] != NULL; i++)
    {
        path = g_build_filename (dirs[i], "applications", filename, NULL);

        if (g_file_test (path, G_FILE_TEST_IS_REGULAR)) break;

        g_free (path);
        path = NULL;
    }

    if (path != NULL)
    {
        ret = launch_desktop_item (path, NULL, user_time, &error);

        if (ret == -1 || error != NULL)
        {
            g_warning ("Cannot launch desktop item '%s': %s\n",
                path, error ? error->message : "(unknown error)");
            g_clear_error (&error);
        }

        g_free (path);
    }

    return ret >= 0;
}

gboolean
ephy_file_launch_handler (const char *mime_type,
              const char *address,
              guint32 user_time)
{
    GnomeVFSMimeApplication *app = NULL;
    GnomeVFSFileInfo *info = NULL;
    char *canonical;
    gboolean ret = FALSE;

    g_return_val_if_fail (address != NULL, FALSE);

    canonical = gnome_vfs_make_uri_canonical (address);
    if (canonical == NULL) return FALSE;

    if (mime_type != NULL)
    {
        app = gnome_vfs_mime_get_default_application (mime_type);
    }
    else
    {
        /* Sniff mime type and check if it's safe to open */
        info = gnome_vfs_file_info_new ();
        if (gnome_vfs_get_file_info (canonical, info,
                         GNOME_VFS_FILE_INFO_GET_MIME_TYPE |
                         GNOME_VFS_FILE_INFO_FORCE_SLOW_MIME_TYPE) == GNOME_VFS_OK &&
            (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_MIME_TYPE) &&
            info->mime_type != NULL &&
            info->mime_type[0] != '\0' &&
            ephy_file_check_mime (info->mime_type) == EPHY_MIME_PERMISSION_SAFE)
        {
            /* FIXME rename tmp file to right extension ? */
            app = gnome_vfs_mime_get_default_application (info->mime_type);
        }
        gnome_vfs_file_info_unref (info);
    }

    if (app != NULL)
    {
        ret = ephy_file_launch_application (app, address, user_time);

        gnome_vfs_mime_application_free (app);
    }
    else
    {
        /* FIXME: warn user? */
        g_warning ("No handler for found or file type is unsafe!\n");
    }

    g_free (canonical);

    return ret;
}

struct _EphyFileMonitor
{
    GnomeVFSMonitorHandle *handle;
    EphyFileMonitorFunc callback;
    EphyFileMonitorDelayFunc delay_func;
    gpointer user_data;
    char *uri;
    guint delay;
    guint timeout_id;
    guint ticks;
    GnomeVFSMonitorEventType type;
};

static gboolean
ephy_file_monitor_timeout_cb (EphyFileMonitor *monitor)
{
    if (monitor->ticks > 0)
    {
        monitor->ticks--;

        /* Run again */
        return TRUE;
    }

    if (monitor->delay_func &&
        monitor->delay_func (monitor, monitor->user_data))
    {
        monitor->ticks = DELAY_MAX_TICKS / 2;

        /* Run again */
        return TRUE;
    }

    monitor->timeout_id = 0;

    monitor->callback (monitor, monitor->uri, monitor->type, monitor->user_data);

    /* don't run again */
    return FALSE;
}

static void
ephy_file_monitor_cb (GnomeVFSMonitorHandle *handle,
              const char *monitor_uri,
              const char *info_uri,
              GnomeVFSMonitorEventType event_type,
              EphyFileMonitor *monitor)
{
    LOG ("File '%s' has changed, scheduling reload", monitor_uri);

    switch (event_type)
    {
        case GNOME_VFS_MONITOR_EVENT_CHANGED:
            monitor->ticks = INITIAL_TICKS;
            /* fall-through */
        case GNOME_VFS_MONITOR_EVENT_CREATED:
            /* We make a lot of assumptions here, but basically we know
             * that we just have to reload, by construction.
             * Delay the reload a little bit so we don't endlessly
             * reload while a file is written.
             */
            monitor->type = event_type;

            if (monitor->ticks == 0)
            {
                monitor->ticks = 1;
            }
            else
            {
                /* Exponential backoff */
                monitor->ticks = MIN (monitor->ticks * 2,
                              DELAY_MAX_TICKS);
            }

            if (monitor->timeout_id == 0)
            {
                monitor->timeout_id = 
                    g_timeout_add (monitor->delay,
                               (GSourceFunc) ephy_file_monitor_timeout_cb,
                               monitor);
            }

            break;

        case GNOME_VFS_MONITOR_EVENT_DELETED:
            if (monitor->timeout_id != 0)
            {
                g_source_remove (monitor->timeout_id);
                monitor->timeout_id = 0;
            }
            monitor->ticks = 0;

            monitor->callback (monitor, monitor->uri, event_type, monitor->user_data);
            break;
        case GNOME_VFS_MONITOR_EVENT_STARTEXECUTING:
        case GNOME_VFS_MONITOR_EVENT_STOPEXECUTING:
        case GNOME_VFS_MONITOR_EVENT_METADATA_CHANGED:
        default:
            break;
    }
}

EphyFileMonitor *
ephy_file_monitor_add (const char *uri,
               GnomeVFSMonitorType monitor_type,
               guint delay,
               EphyFileMonitorFunc callback,
               EphyFileMonitorDelayFunc delay_func,
               gpointer user_data)
{
    EphyFileMonitor *monitor;

    g_return_val_if_fail (uri != NULL, NULL);
    g_return_val_if_fail (callback, NULL);

    monitor = g_new (EphyFileMonitor, 1);
    monitor->callback = callback;
    monitor->delay_func = delay_func;
    monitor->user_data = user_data;
    monitor->uri = g_strdup (uri);
    monitor->delay = delay;
    monitor->ticks = 0;
    monitor->timeout_id = 0;

    if (gnome_vfs_monitor_add (&monitor->handle, uri, monitor_type,
                   (GnomeVFSMonitorCallback) ephy_file_monitor_cb,
                   monitor) != GNOME_VFS_OK)
    {
        LOG ("Failed to add file monitor for '%s'", uri);

        g_free (monitor->uri);
        g_free (monitor);
        return NULL;
    }

    LOG ("File monitor for '%s' added", uri);

    return monitor;
}

void
ephy_file_monitor_cancel (EphyFileMonitor *monitor)
{
    g_return_if_fail (monitor != NULL);
    g_return_if_fail (monitor->handle != NULL);
    g_return_if_fail (monitor->uri != NULL);

    LOG ("Cancelling file monitor for '%s'", monitor->uri);

    gnome_vfs_monitor_cancel (monitor->handle);

    if (monitor->timeout_id != 0)
    {
        g_source_remove (monitor->timeout_id);
    }

    g_free (monitor->uri);
    g_free (monitor);
}