2 * AT-SPI - Assistive Technology Service Provider Interface
3 * (Gnome Accessibility Project; http://developer.gnome.org/projects/gap)
5 * Copyright 2008, 2009 Codethink Ltd.
6 * Copyright 2001, 2002, 2003 Sun Microsystems Inc.,
7 * Copyright 2001, 2002, 2003 Ximian, Inc.
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Library General Public License for more details.
19 * You should have received a copy of the GNU Library General Public
20 * License along with this library; if not, write to the
21 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 * Boston, MA 02111-1307, USA.
26 #include "dbus/dbus-glib-lowlevel.h"
29 #include <X11/Xatom.h>
38 #include <droute/droute.h>
46 #include "accessible-register.h"
47 #include "accessible-leasing.h"
48 #include "accessible-cache.h"
50 #include "common/spi-dbus.h"
52 /*---------------------------------------------------------------------------*/
54 SpiBridge *spi_global_app_data = NULL;
56 static const AtkMisc *atk_misc = NULL;
58 /*static Display *bridge_display = NULL;*/
60 /*---------------------------------------------------------------------------*/
63 * Returns a 'canonicalized' value for DISPLAY,
64 * with the screen number stripped off if present.
68 spi_display_name (void)
70 static const char *canonical_display_name = NULL;
71 if (!canonical_display_name)
73 const gchar *display_env = g_getenv ("AT_SPI_DISPLAY");
76 display_env = g_getenv ("DISPLAY");
77 if (!display_env || !display_env[0])
78 canonical_display_name = ":0";
81 gchar *display_p, *screen_p;
82 canonical_display_name = g_strdup (display_env);
83 display_p = strrchr (canonical_display_name, ':');
84 screen_p = strrchr (canonical_display_name, '.');
85 if (screen_p && display_p && (screen_p > display_p))
93 canonical_display_name = display_env;
96 return canonical_display_name;
99 /*---------------------------------------------------------------------------*/
102 * Gets the IOR from the XDisplay.
103 * Not currently used in D-Bus version, but something similar
104 * may be employed in the future for accessing the registry daemon
108 static DBusConnection *
109 spi_atk_bridge_get_bus (void)
113 Display *bridge_display;
115 unsigned char *data = NULL;
116 unsigned long nitems;
117 unsigned long leftover;
119 DBusConnection *bus = NULL;
122 bridge_display = XOpenDisplay (spi_display_name ());
125 g_warning ("AT_SPI: Could not get the display\n");
129 AT_SPI_BUS = XInternAtom (bridge_display, "AT_SPI_BUS", False);
130 XGetWindowProperty (bridge_display,
131 XDefaultRootWindow (bridge_display),
133 (long) BUFSIZ, False,
134 (Atom) 31, &actual_type, &actual_format,
135 &nitems, &leftover, &data);
137 dbus_error_init (&error);
142 ("AT-SPI: Accessibility bus not found - Using session bus.\n");
143 bus = dbus_bus_get (DBUS_BUS_SESSION, &error);
146 g_warning ("AT-SPI: Couldn't connect to bus: %s\n", error.message);
152 bus = dbus_connection_open (data, &error);
155 g_warning ("AT-SPI: Couldn't connect to bus: %s\n", error.message);
160 if (!dbus_bus_register (bus, &error))
162 g_warning ("AT-SPI: Couldn't register with bus: %s\n", error.message);
172 set_reply (DBusPendingCall *pending, void *user_data)
174 void **replyptr = (void **)user_data;
176 *replyptr = dbus_pending_call_steal_reply (pending);
179 /*---------------------------------------------------------------------------*/
182 add_event (const char *bus_name, const char *event)
188 evdata = (event_data *) g_malloc (sizeof (*evdata));
191 data = g_strsplit (event, ":", 3);
197 evdata->bus_name = g_strdup (bus_name);
199 new_list = g_list_append (spi_global_app_data->events, evdata);
201 spi_global_app_data->events = new_list;
205 get_registered_event_listeners (SpiBridge *app)
207 DBusMessage *message, *reply;
208 DBusMessageIter iter, iter_array, iter_struct;
210 message = dbus_message_new_method_call (SPI_DBUS_NAME_REGISTRY,
211 SPI_DBUS_PATH_REGISTRY,
212 SPI_DBUS_INTERFACE_REGISTRY,
213 "GetRegisteredEvents");
214 spi_global_app_data->events_initialized = TRUE;
218 reply = dbus_connection_send_with_reply_and_block (app->bus, message, 5000, NULL);
219 dbus_message_unref (message);
222 if (strcmp (dbus_message_get_signature (reply), "a(ss)") != 0)
224 /* TODO: Add a warning when it's okay to add strings */
225 dbus_message_unref (reply);
228 dbus_message_iter_init (reply, &iter);
229 dbus_message_iter_recurse (&iter, &iter_array);
230 while (dbus_message_iter_get_arg_type (&iter_array) != DBUS_TYPE_INVALID)
232 char *bus_name, *event;
233 dbus_message_iter_recurse (&iter_array, &iter_struct);
234 dbus_message_iter_get_basic (&iter_struct, &bus_name);
235 dbus_message_iter_next (&iter_struct);
236 dbus_message_iter_get_basic (&iter_struct, &event);
237 add_event (bus_name, event);
238 dbus_message_iter_next (&iter_array);
240 dbus_message_unref (reply);
244 register_reply (DBusPendingCall *pending, void *user_data)
247 SpiBridge *app = user_data;
248 DBusMessage *message;
250 reply = dbus_pending_call_steal_reply (pending);
253 gchar *app_name, *obj_path;
255 if (strcmp (dbus_message_get_signature (reply), "(so)") != 0)
257 g_warning ("AT-SPI: Could not obtain desktop path or name\n");
261 DBusMessageIter iter, iter_struct;
262 dbus_message_iter_init (reply, &iter);
263 dbus_message_iter_recurse (&iter, &iter_struct);
264 dbus_message_iter_get_basic (&iter_struct, &app_name);
265 dbus_message_iter_next (&iter_struct);
266 dbus_message_iter_get_basic (&iter_struct, &obj_path);
268 app->desktop_name = g_strdup (app_name);
269 app->desktop_path = g_strdup (obj_path);
274 g_warning ("AT-SPI: Could not embed inside desktop");
277 dbus_message_unref (reply);
279 get_registered_event_listeners (spi_global_app_data);
283 register_application (SpiBridge * app)
285 DBusMessage *message, *reply;
286 DBusMessageIter iter;
288 DBusPendingCall *pending;
289 const int max_addr_length = 128; /* should be long enough */
291 dbus_error_init (&error);
293 /* These will be overridden when we get a reply, but in practice these
294 defaults should always be correct */
295 app->desktop_name = SPI_DBUS_NAME_REGISTRY;
296 app->desktop_path = SPI_DBUS_PATH_ROOT;
298 message = dbus_message_new_method_call (SPI_DBUS_NAME_REGISTRY,
300 SPI_DBUS_INTERFACE_SOCKET,
303 dbus_message_iter_init_append (message, &iter);
304 spi_object_append_reference (&iter, app->root);
306 if (!dbus_connection_send_with_reply (app->bus, message, &pending, -1))
311 dbus_pending_call_set_notify (pending, register_reply, app, NULL);
314 dbus_message_unref (message);
316 /* could this be better, we accept some amount of race in getting the temp name*/
317 /* make sure the directory exists */
318 mkdir("/tmp/at-spi2/", S_IRWXU);
319 app->app_bus_addr = g_malloc(max_addr_length * sizeof(char));
321 sprintf(app->app_bus_addr, "unix:path=/tmp/at-spi2/socket-%d-%d", getpid(),
328 /*---------------------------------------------------------------------------*/
331 deregister_application (SpiBridge * app)
333 DBusMessage *message;
334 DBusMessageIter iter;
338 dbus_error_init (&error);
340 message = dbus_message_new_method_call (SPI_DBUS_NAME_REGISTRY,
341 SPI_DBUS_PATH_REGISTRY,
342 SPI_DBUS_INTERFACE_REGISTRY,
343 "DeregisterApplication");
344 dbus_message_set_no_reply (message, TRUE);
346 uname = dbus_bus_get_unique_name (app->bus);
348 dbus_message_iter_init_append (message, &iter);
349 dbus_message_iter_append_basic (&iter, DBUS_TYPE_STRING, &uname);
350 dbus_connection_send (app->bus, message, NULL);
352 dbus_message_unref (message);
355 /*---------------------------------------------------------------------------*/
360 if (!spi_global_app_data)
365 spi_atk_tidy_windows ();
366 spi_atk_deregister_event_listeners ();
367 deregister_application (spi_global_app_data);
369 g_free (spi_global_app_data);
370 spi_global_app_data = NULL;
372 /* Not currently creating an XDisplay */
375 XCloseDisplay (bridge_display);
379 /*---------------------------------------------------------------------------*/
381 static AtkPlugClass *plug_class;
382 static AtkSocketClass *socket_class;
385 get_plug_id (AtkPlug * plug)
387 const char *uname = dbus_bus_get_unique_name (spi_global_app_data->bus);
389 GString *str = g_string_new (NULL);
391 path = spi_register_object_to_path (spi_global_register, G_OBJECT (plug));
392 g_string_printf (str, "%s:%s", uname, path);
394 return g_string_free (str, FALSE);
398 socket_ref_state_set (AtkObject *accessible)
400 char *child_name, *child_path;
401 AtkSocket *socket = ATK_SOCKET (accessible);
405 DBusMessage *message, *reply;
406 DBusMessageIter iter, iter_array;
409 if (!socket->embedded_plug_id)
412 child_name = g_strdup (socket->embedded_plug_id);
415 child_path = g_utf8_strchr (child_name + 1, -1, ':');
421 *(child_path++) = '\0';
422 message = dbus_message_new_method_call (child_name, child_path, SPI_DBUS_INTERFACE_ACCESSIBLE, "GetState");
424 reply = dbus_connection_send_with_reply_and_block (spi_global_app_data->bus, message, 1, NULL);
425 dbus_message_unref (message);
428 if (strcmp (dbus_message_get_signature (reply), "au") != 0)
430 dbus_message_unref (reply);
433 set = atk_state_set_new ();
436 dbus_message_iter_init (reply, &iter);
437 dbus_message_iter_recurse (&iter, &iter_array);
440 dbus_message_iter_get_basic (&iter_array, &v);
441 for (j = 0; j < 32; j++)
445 AtkState state = spi_atk_state_from_spi_state ((count << 5) + j);
446 atk_state_set_add_state (set, state);
451 while (dbus_message_iter_next (&iter_array));
452 dbus_message_unref (reply);
457 socket_embed_hook (AtkSocket * socket, gchar * plug_id)
459 AtkObject *accessible = ATK_OBJECT(socket);
460 gchar *plug_name, *plug_path;
461 AtkObjectClass *klass;
463 /* Force registration */
464 gchar *path = spi_register_object_to_path (spi_global_register, G_OBJECT (accessible));
465 /* Let the plug know that it has been embedded */
466 plug_name = g_strdup (plug_id);
472 plug_path = g_utf8_strchr (plug_name + 1, -1, ':');
475 DBusMessage *message;
476 *(plug_path++) = '\0';
477 message = dbus_message_new_method_call (plug_name, plug_path, SPI_DBUS_INTERFACE_SOCKET, "Embedded");
478 dbus_message_append_args (message, DBUS_TYPE_STRING, &path, DBUS_TYPE_INVALID);
479 dbus_connection_send (spi_global_app_data->bus, message, NULL);
484 klass = ATK_OBJECT_GET_CLASS (accessible);
485 klass->ref_state_set = socket_ref_state_set;
489 install_plug_hooks ()
493 data = g_type_class_ref (ATK_TYPE_PLUG);
494 plug_class = ATK_PLUG_CLASS (data);
495 data = g_type_class_ref (ATK_TYPE_SOCKET);
496 socket_class = ATK_SOCKET_CLASS (data);
497 plug_class->get_object_id = get_plug_id;
498 socket_class->embed = socket_embed_hook;
502 new_connection_cb (DBusServer *server, DBusConnection *con, void *data)
506 dbus_connection_ref(con);
507 dbus_connection_setup_with_g_main(con, NULL);
508 droute_intercept_dbus (con);
509 droute_context_register (spi_global_app_data->droute, con);
511 new_list = g_list_append (spi_global_app_data->direct_connections, con);
513 spi_global_app_data->direct_connections = new_list;
523 dbus_error_init(&err);
524 server = dbus_server_listen(spi_global_app_data->app_bus_addr, &err);
526 /* is there a better way to handle this */
530 dbus_server_setup_with_g_main(server, NULL);
531 dbus_server_set_new_connection_function(server, new_connection_cb, NULL, NULL);
533 spi_global_app_data->server = server;
540 gchar *atspi_dbus_name = NULL;
541 static gboolean atspi_no_register = FALSE;
543 static GOptionEntry atspi_option_entries[] = {
544 {"atspi-dbus-name", 0, 0, G_OPTION_ARG_STRING, &atspi_dbus_name,
545 "D-Bus bus name to register as", NULL},
546 {"atspi-no-register", 0, 0, G_OPTION_ARG_NONE, &atspi_no_register,
547 "Do not register with Registry Daemon", NULL},
552 introspect_children_cb (const char *path, void *data)
554 if (!strcmp (path, "/org/a11y/atspi/accessible"))
556 return g_strdup ("<node name=\"root\"/>\n");
557 /* TODO: Should we place the whole hierarchy here? */
563 handle_event_listener_registered (DBusConnection *bus, DBusMessage *message,
569 if (!dbus_message_get_args (message, NULL, DBUS_TYPE_STRING, &sender,
570 DBUS_TYPE_STRING, &name, DBUS_TYPE_INVALID))
573 add_event (sender, name);
577 remove_events (const char *bus_name, const char *event)
583 remove_data = g_strsplit (event, ":", 3);
589 for (list = spi_global_app_data->events; list;)
591 event_data *evdata = list->data;
592 if (!g_strcmp0 (evdata->bus_name, bus_name) &&
593 spi_event_is_subtype (evdata->data, remove_data))
595 GList *events = spi_global_app_data->events;
597 g_strfreev (evdata->data);
598 g_free (evdata->bus_name);
600 spi_global_app_data->events = g_list_remove (events, evdata);
610 handle_event_listener_deregistered (DBusConnection *bus, DBusMessage *message,
613 const char *orig_name;
617 if (!dbus_message_get_args (message, NULL, DBUS_TYPE_STRING, &sender,
618 DBUS_TYPE_STRING, &name, DBUS_TYPE_INVALID))
621 remove_events (sender, name);
624 static DBusHandlerResult
625 signal_filter (DBusConnection *bus, DBusMessage *message, void *user_data)
627 const char *interface = dbus_message_get_interface (message);
628 const char *member = dbus_message_get_member (message);
629 DBusHandlerResult result = DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
631 if (dbus_message_get_type (message) != DBUS_MESSAGE_TYPE_SIGNAL)
632 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
634 if (!strcmp (interface, SPI_DBUS_INTERFACE_REGISTRY))
636 result = DBUS_HANDLER_RESULT_HANDLED;
637 if (!strcmp (member, "EventListenerRegistered"))
638 handle_event_listener_registered (bus, message, user_data);
639 else if (!strcmp (member, "EventListenerDeregistered"))
640 handle_event_listener_deregistered (bus, message, user_data);
642 result = DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
650 * The following needs to be initialized.
652 * - DRoute for routing message to their accessible objects.
653 * - Event handlers for emmitting signals on specific ATK events.
654 * - setup the bus for p2p communication
655 * - Application registration with the AT-SPI registry.
659 adaptor_init (gint * argc, gchar ** argv[])
665 gchar *introspection_directory;
666 static gboolean inited = FALSE;
673 DRoutePath *treepath, *accpath;
675 root = atk_get_root ();
676 g_warn_if_fail (root);
683 /* Parse command line options */
684 opt = g_option_context_new (NULL);
685 g_option_context_add_main_entries (opt, atspi_option_entries, NULL);
686 g_option_context_set_ignore_unknown_options (opt, TRUE);
687 if (!g_option_context_parse (opt, argc, argv, &err))
688 g_warning ("AT-SPI Option parsing failed: %s\n", err->message);
690 /* Allocate global data and do ATK initializations */
691 spi_global_app_data = g_new0 (SpiBridge, 1);
692 atk_misc = atk_misc_get_instance ();
693 spi_global_app_data->root = g_object_ref (root);
695 /* Set up D-Bus connection and register bus name */
696 dbus_error_init (&error);
697 spi_global_app_data->bus = spi_atk_bridge_get_bus ();
698 if (!spi_global_app_data->bus)
700 g_free (spi_global_app_data);
701 spi_global_app_data = NULL;
706 if (atspi_dbus_name != NULL)
708 if (dbus_bus_request_name
709 (spi_global_app_data->bus, atspi_dbus_name, 0, &error))
711 g_print ("AT-SPI Recieved D-Bus name - %s\n", atspi_dbus_name);
716 ("AT-SPI D-Bus name requested but could not be allocated - %s\n",
722 spi_global_app_data->main_context = g_main_context_new ();
724 spi_global_app_data->main_context = NULL;
727 dbus_connection_setup_with_g_main (spi_global_app_data->bus, NULL);
729 /* Hook our plug-and socket functions */
730 install_plug_hooks ();
733 * Create the leasing, register and cache objects.
734 * The order is important here, the cache depends on the
737 spi_global_register = g_object_new (SPI_REGISTER_TYPE, NULL);
738 spi_global_leasing = g_object_new (SPI_LEASING_TYPE, NULL);
739 spi_global_cache = g_object_new (SPI_CACHE_TYPE, NULL);
741 /* Register droute for routing AT-SPI messages */
742 spi_global_app_data->droute =
745 treepath = droute_add_one (spi_global_app_data->droute,
746 "/org/a11y/atspi/cache", spi_global_cache);
750 g_warning ("atk-bridge: Error in droute_add_one(). Already running?");
754 accpath = droute_add_many (spi_global_app_data->droute,
755 "/org/a11y/atspi/accessible",
757 introspect_children_cb,
759 (DRouteGetDatumFunction)
760 spi_global_register_path_to_object);
763 /* Register all interfaces with droute and set up application accessible db */
764 spi_initialize_cache (treepath);
765 spi_initialize_accessible (accpath);
766 spi_initialize_application (accpath);
767 spi_initialize_action (accpath);
768 spi_initialize_collection (accpath);
769 spi_initialize_component (accpath);
770 spi_initialize_document (accpath);
771 spi_initialize_editabletext (accpath);
772 spi_initialize_hyperlink (accpath);
773 spi_initialize_hypertext (accpath);
774 spi_initialize_image (accpath);
775 spi_initialize_selection (accpath);
776 spi_initialize_socket (accpath);
777 spi_initialize_table (accpath);
778 spi_initialize_text (accpath);
779 spi_initialize_value (accpath);
781 droute_context_register (spi_global_app_data->droute,
782 spi_global_app_data->bus);
784 /* Register methods to send D-Bus signals on certain ATK events */
785 spi_atk_register_event_listeners ();
787 /* Set up filter and match rules to catch signals */
788 dbus_bus_add_match (spi_global_app_data->bus, "type='signal', interface='org.a11y.atspi.Registry', sender='org.a11y.atspi.Registry'", NULL);
789 dbus_connection_add_filter (spi_global_app_data->bus, signal_filter, NULL,
792 /* Register this app by sending a signal out to AT-SPI registry daemon */
793 if (!atspi_no_register && (!root || !ATK_IS_PLUG (root)))
794 register_application (spi_global_app_data);
796 get_registered_event_listeners (spi_global_app_data);
803 /*---------------------------------------------------------------------------*/
806 gtk_module_init (gint * argc, gchar ** argv[])
808 const gchar *load_bridge = g_getenv ("NO_AT_BRIDGE");
810 if (!load_bridge || g_ascii_strtod (load_bridge, NULL) == 0)
812 return adaptor_init (argc, argv);
818 g_module_check_init (GModule *module)
820 g_module_make_resident (module);
826 gnome_accessibility_module_init (void)
828 const gchar *load_bridge = g_getenv ("NO_AT_BRIDGE");
830 if (!load_bridge || g_ascii_strtod (load_bridge, NULL) == 0)
832 adaptor_init (NULL, NULL);
834 if (g_getenv ("AT_SPI_DEBUG"))
836 g_print ("Atk Accessibility bridge initialized\n");
842 gnome_accessibility_module_shutdown (void)
844 spi_atk_deregister_event_listeners ();
848 /*END------------------------------------------------------------------------*/