plugins/rb-plugins-engine.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
   2  *
   3  * Plugin manager for Rhythmbox, based heavily on the code from gedit.
   4  *
   5  * Copyright (C) 2002-2005 Paolo Maggi
   6  *               2006 James Livingston  <jrl@ids.org.au>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor,
  21  * Boston, MA 02110-1301  USA.
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <string.h>
  29
  30 #include <glib/gi18n.h>
  31 #include <glib/gkeyfile.h>
  32
  33 #include "eel-gconf-extensions.h"
  34 #include "rb-file-helpers.h"
  35 #include "rb-preferences.h"
  36 #include "rb-util.h"
  37 #include "rb-plugin.h"
  38 #include "rb-debug.h"
  39 #include "rb-dialog.h"
  40
  41 #include "rb-module.h"
  42 #ifdef ENABLE_PYTHON
  43 #include "rb-python-module.h"
  44 #endif
  45
  46 #include "rb-plugins-engine.h"
  47
  48 #define PLUGIN_EXT      ".rb-plugin"
  49
  50 typedef enum
  51 {
  52         RB_PLUGIN_LOADER_C,
  53         RB_PLUGIN_LOADER_PY,
  54 } RBPluginLang;
  55
  56 struct _RBPluginInfo
  57 {
  58         gchar        *file;
  59
  60         gchar        *location;
  61         RBPluginLang lang;
  62         GTypeModule  *module;
  63
  64         gchar        *name;
  65         gchar        *desc;
  66         gchar        **authors;
  67         gchar        *copyright;
  68         gchar        *website;
  69
  70         gchar        *icon_name;
  71         GdkPixbuf    *icon_pixbuf;
  72
  73         RBPlugin     *plugin;
  74
  75         gboolean     active;
  76         gboolean     visible;
  77         guint        active_notification_id;
  78         guint        visible_notification_id;
  79 };
  80
  81 static void rb_plugin_info_free (RBPluginInfo *info);
  82 static void rb_plugins_engine_plugin_active_cb (GConfClient *client,
  83                                                 guint cnxn_id,
  84                                                 GConfEntry *entry,
  85                                                 RBPluginInfo *info);
  86 static void rb_plugins_engine_plugin_visible_cb (GConfClient *client,
  87                                                  guint cnxn_id,
  88                                                  GConfEntry *entry,
  89                                                  RBPluginInfo *info);
  90 static gboolean rb_plugins_engine_activate_plugin_real (RBPluginInfo *info,
  91                                                         RBShell *shell);
  92 static void rb_plugins_engine_deactivate_plugin_real (RBPluginInfo *info,
  93                                                       RBShell *shell);
  94
  95 static GHashTable *rb_plugins = NULL;
  96 guint garbage_collect_id = 0;
  97 RBShell *rb_plugins_shell = NULL;
  98
  99 static RBPluginInfo *
 100 rb_plugins_engine_load (const gchar *file)
 101 {
 102         RBPluginInfo *info;
 103         GKeyFile *plugin_file = NULL;
 104         gchar *str;
 105
 106         g_return_val_if_fail (file != NULL, NULL);
 107
 108         rb_debug ("Loading plugin: %s", file);
 109
 110         info = g_new0 (RBPluginInfo, 1);
 111         info->file = g_strdup (file);
 112
 113         plugin_file = g_key_file_new ();
 114         if (!g_key_file_load_from_file (plugin_file, file, G_KEY_FILE_NONE, NULL))
 115         {
 116                 g_warning ("Bad plugin file: %s", file);
 117                 goto error;
 118         }
 119
 120         if (!g_key_file_has_key (plugin_file,
 121                                  "RB Plugin",
 122                                  "IAge",
 123                                  NULL))
 124         {
 125                 rb_debug ("IAge key does not exist in file: %s", file);
 126                 goto error;
 127         }
 128
 129         /* Check IAge=1 */
 130         if (g_key_file_get_integer (plugin_file,
 131                                     "RB Plugin",
 132                                     "IAge",
 133                                     NULL) != 1)
 134         {
 135                 rb_debug ("Wrong IAge in file: %s", file);
 136                 goto error;
 137         }
 138
 139         /* Get Location */
 140         str = g_key_file_get_string (plugin_file,
 141                                      "RB Plugin",
 142                                      "Module",
 143                                      NULL);
 144         if (str)
 145         {
 146                 info->location = str;
 147         }
 148         else
 149         {
 150                 g_warning ("Could not find 'Module' in %s", file);
 151                 goto error;
 152         }
 153
 154         /* Get the loader for this plugin */
 155         str = g_key_file_get_string (plugin_file,
 156                                      "RB Plugin",
 157                                      "Loader",
 158                                      NULL);
 159         if (str && strcmp(str, "python") == 0)
 160         {
 161                 info->lang = RB_PLUGIN_LOADER_PY;
 162 #ifndef ENABLE_PYTHON
 163                 rb_debug ("Cannot load python extension '%s', Rhythmbox was not "
 164                                         "compiled with python support", file);
 165                 goto error;
 166 #endif
 167         }
 168         else
 169         {
 170                 info->lang = RB_PLUGIN_LOADER_C;
 171         }
 172         g_free (str);
 173
 174         /* Get Name */
 175         str = g_key_file_get_locale_string (plugin_file,
 176                                             "RB Plugin",
 177                                             "Name",
 178                                             NULL, NULL);
 179         if (str)
 180                 info->name = str;
 181         else
 182         {
 183                 g_warning ("Could not find 'Name' in %s", file);
 184                 goto error;
 185         }
 186
 187         /* Get Description */
 188         str = g_key_file_get_locale_string (plugin_file,
 189                                             "RB Plugin",
 190                                             "Description",
 191                                             NULL, NULL);
 192         if (str)
 193                 info->desc = str;
 194         else
 195                 rb_debug ("Could not find 'Description' in %s", file);
 196
 197         /* Get icon name */
 198         str = g_key_file_get_string (plugin_file,
 199                                      "RB Plugin",
 200                                      "Icon",
 201                                      NULL);
 202         if (str)
 203                 info->icon_name = str;
 204         else
 205                 rb_debug ("Could not find 'Description' in %s", file);
 206
 207         /* Get Authors */
 208         info->authors = g_key_file_get_string_list (plugin_file,
 209                                                     "RB Plugin",
 210                                                     "Authors",
 211                                                     NULL, NULL);
 212         if (info->authors == NULL)
 213                 rb_debug ("Could not find 'Authors' in %s", file);
 214
 215         /* Get Copyright */
 216         str = g_key_file_get_string (plugin_file,
 217                                      "RB Plugin",
 218                                      "Copyright",
 219                                      NULL);
 220         if (str)
 221                 info->copyright = str;
 222         else
 223                 rb_debug ("Could not find 'Copyright' in %s", file);
 224
 225         /* Get Copyright */
 226         str = g_key_file_get_string (plugin_file,
 227                                      "RB Plugin",
 228                                      "Website",
 229                                      NULL);
 230         if (str)
 231                 info->website = str;
 232         else
 233                 rb_debug ("Could not find 'Website' in %s", file);
 234
 235         g_key_file_free (plugin_file);
 236
 237         return info;
 238
 239 error:
 240         g_free (info->file);
 241         g_free (info->location);
 242         g_free (info->name);
 243         g_free (info);
 244         g_key_file_free (plugin_file);
 245
 246         return NULL;
 247 }
 248
 249 static void
 250 rb_plugins_engine_load_cb (const char *uri, gpointer userdata)
 251 {
 252         gchar *plugin_file;
 253         RBPluginInfo *info;
 254         char *key_name;
 255         gboolean activate;
 256
 257         if (!g_str_has_suffix (uri, PLUGIN_EXT))
 258                 return;
 259
 260         plugin_file = gnome_vfs_get_local_path_from_uri (uri);
 261         info = rb_plugins_engine_load (plugin_file);
 262         g_free (plugin_file);
 263
 264         if (info == NULL)
 265                 return;
 266
 267         if (g_hash_table_lookup (rb_plugins, info->location)) {
 268                 rb_plugin_info_free (info);
 269                 return;
 270         }
 271
 272         g_hash_table_insert (rb_plugins, info->location, info);
 273         rb_debug ("Plugin %s loaded", info->name);
 274
 275         key_name = g_strdup_printf (CONF_PLUGIN_ACTIVE_KEY, info->location);
 276         info->active_notification_id = eel_gconf_notification_add (key_name,
 277                                                                    (GConfClientNotifyFunc)rb_plugins_engine_plugin_active_cb,
 278                                                                    info);
 279         activate = eel_gconf_get_boolean (key_name);
 280         g_free (key_name);
 281
 282         key_name = g_strdup_printf (CONF_PLUGIN_HIDDEN_KEY, info->location);
 283         info->visible_notification_id = eel_gconf_notification_add (key_name,
 284                                                                     (GConfClientNotifyFunc)rb_plugins_engine_plugin_visible_cb,
 285                                                                     info);
 286         info->visible = !eel_gconf_get_boolean (key_name);
 287         g_free (key_name);
 288
 289         if (activate)
 290                 rb_plugins_engine_activate_plugin (info);
 291 }
 292
 293 static void
 294 rb_plugins_engine_load_dir (const gchar *path)
 295 {
 296         char *uri;
 297
 298         uri = rb_uri_resolve_relative (path);
 299         rb_uri_handle_recursively (uri, (GFunc)rb_plugins_engine_load_cb, NULL, NULL);
 300         g_free (uri);
 301 }
 302
 303 static void
 304 rb_plugins_engine_load_all (void)
 305 {
 306         GList *paths;
 307
 308         paths = rb_get_plugin_paths ();
 309         while (paths != NULL) {
 310                 rb_plugins_engine_load_dir (paths->data);
 311                 g_free (paths->data);
 312                 paths = g_list_delete_link (paths, paths);
 313         }
 314 }
 315
 316 static gboolean
 317 garbage_collect_cb (gpointer data)
 318 {
 319         rb_plugins_engine_garbage_collect ();
 320         return TRUE;
 321 }
 322
 323 gboolean
 324 rb_plugins_engine_init (RBShell *shell)
 325 {
 326         g_return_val_if_fail (rb_plugins == NULL, FALSE);
 327
 328         if (!g_module_supported ())
 329         {
 330                 g_warning ("rb is not able to initialize the plugins engine.");
 331                 return FALSE;
 332         }
 333         rb_profile_start ("plugins engine init");
 334
 335         rb_plugins = g_hash_table_new_full (g_str_hash, g_str_equal, NULL, (GDestroyNotify)rb_plugin_info_free);
 336
 337         rb_plugins_shell = shell;
 338         g_object_ref (G_OBJECT (rb_plugins_shell));
 339
 340         rb_plugins_engine_load_all ();
 341
 342         garbage_collect_id = g_timeout_add_full (G_PRIORITY_LOW, 20000, garbage_collect_cb, NULL, NULL);
 343
 344         rb_profile_end ("plugins engine init");
 345
 346         return TRUE;
 347 }
 348
 349 void
 350 rb_plugins_engine_garbage_collect (void)
 351 {
 352 #ifdef ENABLE_PYTHON
 353         rb_python_garbage_collect ();
 354 #endif
 355 }
 356
 357 static void
 358 rb_plugin_info_free (RBPluginInfo *info)
 359 {
 360         if (info->active)
 361                 rb_plugins_engine_deactivate_plugin_real (info, rb_plugins_shell);
 362
 363         if (info->plugin != NULL) {
 364                 rb_debug ("Unref plugin %s", info->name);
 365
 366                 g_object_unref (info->plugin);
 367
 368                 /* info->module must not be unref since it is not possible to finalize
 369                  * a type module */
 370         }
 371
 372         eel_gconf_notification_remove (info->active_notification_id);
 373         eel_gconf_notification_remove (info->visible_notification_id);
 374
 375         g_free (info->file);
 376         g_free (info->location);
 377         g_free (info->name);
 378         g_free (info->desc);
 379         g_free (info->website);
 380         g_free (info->copyright);
 381         g_free (info->icon_name);
 382
 383         if (info->icon_pixbuf)
 384                 g_object_unref (info->icon_pixbuf);
 385         g_strfreev (info->authors);
 386
 387         g_free (info);
 388 }
 389
 390 void
 391 rb_plugins_engine_shutdown (void)
 392 {
 393         g_hash_table_destroy (rb_plugins);
 394         rb_plugins = NULL;
 395
 396         g_object_unref (rb_plugins_shell);
 397         rb_plugins_shell = NULL;
 398
 399         g_source_remove (garbage_collect_id);
 400         rb_plugins_engine_garbage_collect ();
 401
 402 #ifdef ENABLE_PYTHON
 403         rb_python_shutdown ();
 404 #endif
 405 }
 406
 407 GList *
 408 rb_plugins_engine_get_plugins_list (void)
 409 {
 410         return rb_collate_hash_table_values (rb_plugins);
 411 }
 412
 413 static gboolean
 414 load_plugin_module (RBPluginInfo *info)
 415 {
 416         gchar *path;
 417         gchar *dirname;
 418
 419         g_return_val_if_fail (info != NULL, FALSE);
 420         g_return_val_if_fail (info->file != NULL, FALSE);
 421         g_return_val_if_fail (info->location != NULL, FALSE);
 422         g_return_val_if_fail (info->plugin == NULL, FALSE);
 423
 424         switch (info->lang) {
 425                 case RB_PLUGIN_LOADER_C:
 426                         dirname = g_path_get_dirname (info->file);
 427                         g_return_val_if_fail (dirname != NULL, FALSE);
 428
 429                         path = g_module_build_path (dirname, info->location);
 430 #ifdef SHARE_UNINSTALLED_DIR
 431                         if (!g_file_test (path, G_FILE_TEST_EXISTS)) {
 432                                 char *temp;
 433
 434                                 g_free (path);
 435                                 temp = g_build_filename (dirname, ".libs", NULL);
 436
 437                                 path = g_module_build_path (temp, info->location);
 438                                 g_free (temp);
 439                         }
 440 #endif
 441
 442                         g_free (dirname);
 443                         g_return_val_if_fail (path != NULL, FALSE);
 444
 445                         info->module = G_TYPE_MODULE (rb_module_new (path, info->location));
 446                         g_free (path);
 447                         break;
 448                 case RB_PLUGIN_LOADER_PY:
 449 #ifdef ENABLE_PYTHON
 450                         info->module = G_TYPE_MODULE (rb_python_module_new (info->file, info->location));
 451 #else
 452                         rb_debug ("cannot load plugin %s, python plugin support is disabled", info->location);
 453 #endif
 454                         break;
 455         }
 456
 457         if (g_type_module_use (info->module) == FALSE) {
 458                 g_warning ("Could not load plugin %s\n", info->location);
 459
 460                 g_object_unref (G_OBJECT (info->module));
 461                 info->module = NULL;
 462
 463                 return FALSE;
 464         }
 465
 466         switch (info->lang) {
 467                 case RB_PLUGIN_LOADER_C:
 468                         info->plugin = RB_PLUGIN (rb_module_new_object (RB_MODULE (info->module)));
 469                         break;
 470                 case RB_PLUGIN_LOADER_PY:
 471 #ifdef ENABLE_PYTHON
 472                         info->plugin = RB_PLUGIN (rb_python_module_new_object (RB_PYTHON_MODULE (info->module)));
 473 #endif
 474                         break;
 475         }
 476
 477         return TRUE;
 478 }
 479
 480 static gboolean
 481 rb_plugins_engine_activate_plugin_real (RBPluginInfo *info, RBShell *shell)
 482 {
 483         gboolean res = TRUE;
 484
 485         if (info->plugin == NULL)
 486                 res = load_plugin_module (info);
 487
 488         if (res)
 489                 rb_plugin_activate (info->plugin, shell);
 490         else
 491                 g_warning ("Error, impossible to activate plugin '%s'", info->name);
 492
 493         return res;
 494 }
 495
 496 gboolean
 497 rb_plugins_engine_activate_plugin (RBPluginInfo *info)
 498 {
 499         g_return_val_if_fail (info != NULL, FALSE);
 500
 501         if (info->active)
 502                 return TRUE;
 503
 504         if (rb_plugins_engine_activate_plugin_real (info, rb_plugins_shell)) {
 505                 char *key_name;
 506
 507                 key_name = g_strdup_printf (CONF_PLUGIN_ACTIVE_KEY, info->location);
 508                 eel_gconf_set_boolean (key_name, TRUE);
 509                 g_free (key_name);
 510
 511                 info->active = TRUE;
 512
 513                 return TRUE;
 514         }
 515
 516         rb_error_dialog (NULL, _("Plugin Error"), _("Unable to activate plugin %s"), info->name);
 517
 518         return FALSE;
 519 }
 520
 521 static void
 522 rb_plugins_engine_deactivate_plugin_real (RBPluginInfo *info, RBShell *shell)
 523 {
 524         rb_plugin_deactivate (info->plugin, rb_plugins_shell);
 525 }
 526
 527 gboolean
 528 rb_plugins_engine_deactivate_plugin (RBPluginInfo *info)
 529 {
 530         char *key_name;
 531
 532         g_return_val_if_fail (info != NULL, FALSE);
 533
 534         if (!info->active)
 535                 return TRUE;
 536
 537         rb_plugins_engine_deactivate_plugin_real (info, rb_plugins_shell);
 538
 539         /* Update plugin state */
 540         info->active = FALSE;
 541
 542         key_name = g_strdup_printf (CONF_PLUGIN_ACTIVE_KEY, info->location);
 543         eel_gconf_set_boolean (key_name, FALSE);
 544         g_free (key_name);
 545
 546         return TRUE;
 547 }
 548
 549 gboolean
 550 rb_plugins_engine_plugin_is_active (RBPluginInfo *info)
 551 {
 552         g_return_val_if_fail (info != NULL, FALSE);
 553
 554         return info->active;
 555 }
 556
 557 gboolean
 558 rb_plugins_engine_plugin_is_visible (RBPluginInfo *info)
 559 {
 560         g_return_val_if_fail (info != NULL, FALSE);
 561
 562         return info->visible;
 563 }
 564
 565 gboolean
 566 rb_plugins_engine_plugin_is_configurable (RBPluginInfo *info)
 567 {
 568         g_return_val_if_fail (info != NULL, FALSE);
 569
 570         if ((info->plugin == NULL) || !info->active)
 571                 return FALSE;
 572
 573         return rb_plugin_is_configurable (info->plugin);
 574 }
 575
 576 void
 577 rb_plugins_engine_configure_plugin (RBPluginInfo *info,
 578                                        GtkWindow       *parent)
 579 {
 580         GtkWidget *conf_dlg;
 581
 582         GtkWindowGroup *wg;
 583
 584         g_return_if_fail (info != NULL);
 585
 586         conf_dlg = rb_plugin_create_configure_dialog (info->plugin);
 587         g_return_if_fail (conf_dlg != NULL);
 588         gtk_window_set_transient_for (GTK_WINDOW (conf_dlg),
 589                                       parent);
 590
 591         wg = parent->group;
 592         if (wg == NULL)
 593         {
 594                 wg = gtk_window_group_new ();
 595                 gtk_window_group_add_window (wg, parent);
 596         }
 597
 598         gtk_window_group_add_window (wg,
 599                                      GTK_WINDOW (conf_dlg));
 600
 601         gtk_window_set_modal (GTK_WINDOW (conf_dlg), TRUE);
 602         gtk_widget_show (conf_dlg);
 603 }
 604
 605 static void
 606 rb_plugins_engine_plugin_active_cb (GConfClient *client,
 607                                     guint cnxn_id,
 608                                     GConfEntry *entry,
 609                                     RBPluginInfo *info)
 610 {
 611         if (gconf_value_get_bool (entry->value)) {
 612                 rb_plugins_engine_activate_plugin (info);
 613         } else {
 614                 rb_plugins_engine_deactivate_plugin (info);
 615         }
 616 }
 617
 618 static void
 619 rb_plugins_engine_plugin_visible_cb (GConfClient *client,
 620                                      guint cnxn_id,
 621                                      GConfEntry *entry,
 622                                      RBPluginInfo *info)
 623 {
 624         info->visible = !gconf_value_get_bool (entry->value);
 625 }
 626
 627 const gchar *
 628 rb_plugins_engine_get_plugin_name (RBPluginInfo *info)
 629 {
 630         g_return_val_if_fail (info != NULL, NULL);
 631
 632         return info->name;
 633 }
 634
 635 const gchar *
 636 rb_plugins_engine_get_plugin_description (RBPluginInfo *info)
 637 {
 638         g_return_val_if_fail (info != NULL, NULL);
 639
 640         return info->desc;
 641 }
 642
 643 const gchar **
 644 rb_plugins_engine_get_plugin_authors (RBPluginInfo *info)
 645 {
 646         g_return_val_if_fail (info != NULL, (const gchar **)NULL);
 647
 648         return (const gchar **)info->authors;
 649 }
 650
 651 const gchar *
 652 rb_plugins_engine_get_plugin_website (RBPluginInfo *info)
 653 {
 654         g_return_val_if_fail (info != NULL, NULL);
 655
 656         return info->website;
 657 }
 658
 659 const gchar *
 660 rb_plugins_engine_get_plugin_copyright (RBPluginInfo *info)
 661 {
 662         g_return_val_if_fail (info != NULL, NULL);
 663
 664         return info->copyright;
 665 }
 666
 667 GdkPixbuf *
 668 rb_plugins_engine_get_plugin_icon (RBPluginInfo *info)
 669 {
 670         if (info->icon_name == NULL)
 671                 return NULL;
 672
 673         if (info->icon_pixbuf == NULL) {
 674                 char *filename = NULL;
 675                 char *dirname;
 676
 677                 dirname = g_path_get_dirname (info->file);
 678                 filename = g_build_filename (dirname, info->icon_name, NULL);
 679                 g_free (dirname);
 680
 681                 info->icon_pixbuf = gdk_pixbuf_new_from_file (filename, NULL);
 682                 g_free (filename);
 683         }
 684
 685         return info->icon_pixbuf;
 686 }