summaryrefslogtreecommitdiff
path: root/libmate-desktop/mate-desktop-thumbnail.c
blob: e88c5373efbe95d13f39e5d681bc380ea258e08b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
/*
 * mate-thumbnail.c: Utilities for handling thumbnails
 *
 * Copyright (C) 2002 Red Hat, Inc.
 * Copyright (C) 2010 Carlos Garcia Campos <carlosgc@gnome.org>
 *
 * This file is part of the Mate Library.
 *
 * The Mate Library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * The Mate Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with the Mate Library; see the file COPYING.LIB.  If not,
 * write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 * Author: Alexander Larsson <alexl@redhat.com>
 */

#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdlib.h>
#include <dirent.h>
#include <time.h>
#include <math.h>
#include <string.h>
#include <glib.h>
#include <stdio.h>

#define GDK_PIXBUF_ENABLE_BACKEND
#include <gdk-pixbuf/gdk-pixbuf.h>

#define MATE_DESKTOP_USE_UNSTABLE_API
#include "mate-desktop-thumbnail.h"
#include <glib/gstdio.h>
#include <glib-unix.h>

#define SECONDS_BETWEEN_STATS 10

static void
thumbnailers_directory_changed (GFileMonitor                 *monitor,
                                GFile                        *file,
                                GFile                        *other_file,
                                GFileMonitorEvent             event_type,
                                MateDesktopThumbnailFactory  *factory);

struct _MateDesktopThumbnailFactoryPrivate {
  MateDesktopThumbnailSize size;

  GMutex lock;

  GList *thumbnailers;
  GHashTable *mime_types_map;
  GList *monitors;

  GSettings *settings;
  gboolean loaded : 1;
  gboolean disabled : 1;
  gchar **disabled_types;
};

static const char *appname = "mate-thumbnail-factory";

G_DEFINE_TYPE_WITH_PRIVATE (MateDesktopThumbnailFactory,
                            mate_desktop_thumbnail_factory,
                            G_TYPE_OBJECT)

#define parent_class mate_desktop_thumbnail_factory_parent_class

#define THUMBNAILER_ENTRY_GROUP "Thumbnailer Entry"
#define THUMBNAILER_EXTENSION   ".thumbnailer"

typedef struct {
    volatile gint ref_count;
    gchar  *path;
    gchar  *try_exec;
    gchar  *command;
    gchar **mime_types;
} Thumbnailer;

static Thumbnailer *
thumbnailer_ref (Thumbnailer *thumb)
{
  g_return_val_if_fail (thumb != NULL, NULL);
  g_return_val_if_fail (thumb->ref_count > 0, NULL);

  g_atomic_int_inc (&thumb->ref_count);
  return thumb;
}

static void
thumbnailer_unref (Thumbnailer *thumb)
{
  g_return_if_fail (thumb != NULL);
  g_return_if_fail (thumb->ref_count > 0);

  if (g_atomic_int_dec_and_test (&thumb->ref_count))
    {
      g_free (thumb->path);
      g_free (thumb->try_exec);
      g_free (thumb->command);
      g_strfreev (thumb->mime_types);
      g_slice_free (Thumbnailer, thumb);
    }
}

static Thumbnailer *
thumbnailer_load (Thumbnailer *thumb)
{
  GKeyFile *key_file;
  GError *error = NULL;

  key_file = g_key_file_new ();
  if (!g_key_file_load_from_file (key_file, thumb->path, 0, &error))
    {
      g_warning ("Failed to load thumbnailer from \"%s\": %s\n", thumb->path, error->message);
      g_error_free (error);
      thumbnailer_unref (thumb);
      g_key_file_free (key_file);

      return NULL;
    }

  if (!g_key_file_has_group (key_file, THUMBNAILER_ENTRY_GROUP))
    {
      g_warning ("Invalid thumbnailer: missing group \"%s\"\n", THUMBNAILER_ENTRY_GROUP);
      thumbnailer_unref (thumb);
      g_key_file_free (key_file);

      return NULL;
    }

  thumb->command = g_key_file_get_string (key_file, THUMBNAILER_ENTRY_GROUP, "Exec", NULL);
  if (!thumb->command)
    {
      g_warning ("Invalid thumbnailer: missing Exec key\n");
      thumbnailer_unref (thumb);
      g_key_file_free (key_file);

      return NULL;
    }

  thumb->mime_types = g_key_file_get_string_list (key_file, THUMBNAILER_ENTRY_GROUP, "MimeType", NULL, NULL);
  if (!thumb->mime_types)
    {
      g_warning ("Invalid thumbnailer: missing MimeType key\n");
      thumbnailer_unref (thumb);
      g_key_file_free (key_file);

      return NULL;
    }

  thumb->try_exec = g_key_file_get_string (key_file, THUMBNAILER_ENTRY_GROUP, "TryExec", NULL);

  g_key_file_free (key_file);

  return thumb;
}

static Thumbnailer *
thumbnailer_reload (Thumbnailer *thumb)
{
  g_return_val_if_fail (thumb != NULL, NULL);

  g_free (thumb->command);
  thumb->command = NULL;
  g_strfreev (thumb->mime_types);
  thumb->mime_types = NULL;
  g_free (thumb->try_exec);
  thumb->try_exec = NULL;

  return thumbnailer_load (thumb);
}

static Thumbnailer *
thumbnailer_new (const gchar *path)
{
  Thumbnailer *thumb;

  thumb = g_slice_new0 (Thumbnailer);
  thumb->ref_count = 1;
  thumb->path = g_strdup (path);

  return thumbnailer_load (thumb);
}

static gboolean
thumbnailer_try_exec (Thumbnailer *thumb)
{
  gchar *path;
  gboolean retval;

  if (G_UNLIKELY (!thumb))
    return FALSE;

  /* TryExec is optinal, but Exec isn't, so we assume
   * the thumbnailer can be run when TryExec is not present
   */
  if (!thumb->try_exec)
    return TRUE;

  path = g_find_program_in_path (thumb->try_exec);
  retval = path != NULL;
  g_free (path);

  return retval;
}

static gpointer
init_thumbnailers_dirs (gpointer data)
{
  const gchar * const *data_dirs;
  GPtrArray *thumbs_dirs;
  guint i;

  data_dirs = g_get_system_data_dirs ();
  thumbs_dirs = g_ptr_array_new ();

  g_ptr_array_add (thumbs_dirs, g_build_filename (g_get_user_data_dir (), "thumbnailers", NULL));
  for (i = 0; data_dirs[i] != NULL; i++)
    g_ptr_array_add (thumbs_dirs, g_build_filename (data_dirs[i], "thumbnailers", NULL));
  g_ptr_array_add (thumbs_dirs, NULL);

  return g_ptr_array_free (thumbs_dirs, FALSE);
}

static const gchar * const *
get_thumbnailers_dirs (void)
{
  static GOnce once_init = G_ONCE_INIT;
  return g_once (&once_init, init_thumbnailers_dirs, NULL);
}

/* These should be called with the lock held */
static void
mate_desktop_thumbnail_factory_register_mime_types (MateDesktopThumbnailFactory *factory,
                                                     Thumbnailer                  *thumb)
{
  MateDesktopThumbnailFactoryPrivate *priv = factory->priv;
  gint i;

  for (i = 0; thumb->mime_types[i]; i++)
    {
      if (!g_hash_table_lookup (priv->mime_types_map, thumb->mime_types[i]))
        g_hash_table_insert (priv->mime_types_map,
                             g_strdup (thumb->mime_types[i]),
                             thumbnailer_ref (thumb));
    }
}

static void
mate_desktop_thumbnail_factory_add_thumbnailer (MateDesktopThumbnailFactory *factory,
                                                 Thumbnailer                  *thumb)
{
  MateDesktopThumbnailFactoryPrivate *priv = factory->priv;

  mate_desktop_thumbnail_factory_register_mime_types (factory, thumb);
  priv->thumbnailers = g_list_prepend (priv->thumbnailers, thumb);
}

static gboolean
mate_desktop_thumbnail_factory_is_disabled (MateDesktopThumbnailFactory *factory,
                                             const gchar                  *mime_type)
{
  MateDesktopThumbnailFactoryPrivate *priv = factory->priv;
  guint i;

  if (priv->disabled)
    return TRUE;

  if (!priv->disabled_types)
    return FALSE;

  for (i = 0; priv->disabled_types[i]; i++)
    {
      if (g_strcmp0 (priv->disabled_types[i], mime_type) == 0)
        return TRUE;
    }

  return FALSE;
}

static gboolean
remove_thumbnailer_from_mime_type_map (gchar       *key,
                                       Thumbnailer *value,
                                       gchar       *path)
{
  return (strcmp (value->path, path) == 0);
}

static void
update_or_create_thumbnailer (MateDesktopThumbnailFactory *factory,
                              const gchar                 *path)
{
  MateDesktopThumbnailFactoryPrivate *priv = factory->priv;
  GList *l;
  Thumbnailer *thumb;
  gboolean found = FALSE;

  g_mutex_lock (&priv->lock);

  for (l = priv->thumbnailers; l && !found; l = g_list_next (l))
    {
      thumb = (Thumbnailer *)l->data;

      if (strcmp (thumb->path, path) == 0)
        {
          found = TRUE;

          /* First remove the mime_types associated to this thumbnailer */
          g_hash_table_foreach_remove (priv->mime_types_map,
                                       (GHRFunc)remove_thumbnailer_from_mime_type_map,
                                       (gpointer)path);
          if (!thumbnailer_reload (thumb))
              priv->thumbnailers = g_list_delete_link (priv->thumbnailers, l);
          else
              mate_desktop_thumbnail_factory_register_mime_types (factory, thumb);
        }
    }

  if (!found)
    {
      thumb = thumbnailer_new (path);
      if (thumb)
        mate_desktop_thumbnail_factory_add_thumbnailer (factory, thumb);
    }

  g_mutex_unlock (&priv->lock);
}

static void
remove_thumbnailer (MateDesktopThumbnailFactory *factory,
                    const gchar                 *path)
{
  MateDesktopThumbnailFactoryPrivate *priv = factory->priv;
  GList *l;
  Thumbnailer *thumb;

  g_mutex_lock (&priv->lock);

  for (l = priv->thumbnailers; l; l = g_list_next (l))
    {
      thumb = (Thumbnailer *)l->data;

      if (strcmp (thumb->path, path) == 0)
        {
          priv->thumbnailers = g_list_delete_link (priv->thumbnailers, l);
          g_hash_table_foreach_remove (priv->mime_types_map,
                                       (GHRFunc)remove_thumbnailer_from_mime_type_map,
                                       (gpointer)path);
          thumbnailer_unref (thumb);

          break;
        }
    }

  g_mutex_unlock (&priv->lock);
}

static void
remove_thumbnailers_for_dir (MateDesktopThumbnailFactory *factory,
                             const gchar                 *thumbnailer_dir,
                             GFileMonitor                *monitor)
{
  MateDesktopThumbnailFactoryPrivate *priv = factory->priv;
  GList *l;
  Thumbnailer *thumb;

  g_mutex_lock (&priv->lock);

  /* Remove all the thumbnailers inside this @thumbnailer_dir. */
  for (l = priv->thumbnailers; l; l = g_list_next (l))
    {
      thumb = (Thumbnailer *)l->data;

      if (g_str_has_prefix (thumb->path, thumbnailer_dir) == TRUE)
        {
          priv->thumbnailers = g_list_delete_link (priv->thumbnailers, l);
          g_hash_table_foreach_remove (priv->mime_types_map,
                                       (GHRFunc)remove_thumbnailer_from_mime_type_map,
                                       (gpointer)thumb->path);
          thumbnailer_unref (thumb);

          break;
        }
    }

  /* Remove the monitor for @thumbnailer_dir. */
  priv->monitors = g_list_remove (priv->monitors, monitor);
  g_signal_handlers_disconnect_by_func (monitor, thumbnailers_directory_changed, factory);

  g_mutex_unlock (&priv->lock);
}

static void
mate_desktop_thumbnail_factory_load_thumbnailers_for_dir (MateDesktopThumbnailFactory *factory,
                                                          const gchar                 *path)
{
  MateDesktopThumbnailFactoryPrivate *priv = factory->priv;
  GDir *dir;
  GFile *dir_file;
  GFileMonitor *monitor;
  const gchar *dirent;

  dir = g_dir_open (path, 0, NULL);
  if (!dir)
      return;

  /* Monitor dir */
  dir_file = g_file_new_for_path (path);
  monitor = g_file_monitor_directory (dir_file,
                                      G_FILE_MONITOR_NONE,
                                      NULL, NULL);
  if (monitor)
    {
      g_signal_connect (monitor, "changed",
                        G_CALLBACK (thumbnailers_directory_changed),
                        factory);
      priv->monitors = g_list_prepend (priv->monitors, monitor);
    }
  g_object_unref (dir_file);

  while ((dirent = g_dir_read_name (dir)))
    {
      Thumbnailer *thumb;
      gchar       *filename;

      if (!g_str_has_suffix (dirent, THUMBNAILER_EXTENSION))
          continue;

      filename = g_build_filename (path, dirent, NULL);
      thumb = thumbnailer_new (filename);
      g_free (filename);

      if (thumb)
          mate_desktop_thumbnail_factory_add_thumbnailer (factory, thumb);
    }

  g_dir_close (dir);
}

static void
thumbnailers_directory_changed (GFileMonitor                *monitor,
                                GFile                       *file,
                                GFile                       *other_file,
                                GFileMonitorEvent            event_type,
                                MateDesktopThumbnailFactory *factory)
{
  gchar *path;

  switch (event_type)
    {
    case G_FILE_MONITOR_EVENT_CREATED:
    case G_FILE_MONITOR_EVENT_CHANGED:
    case G_FILE_MONITOR_EVENT_DELETED:
      path = g_file_get_path (file);
      if (!g_str_has_suffix (path, THUMBNAILER_EXTENSION))
        {
          g_free (path);
          return;
        }

      if (event_type == G_FILE_MONITOR_EVENT_DELETED)
        remove_thumbnailer (factory, path);
      else
        update_or_create_thumbnailer (factory, path);

      g_free (path);
      break;
    case G_FILE_MONITOR_EVENT_UNMOUNTED:
    case G_FILE_MONITOR_EVENT_MOVED:
      path = g_file_get_path (file);
      remove_thumbnailers_for_dir (factory, path, monitor);

      if (event_type == G_FILE_MONITOR_EVENT_MOVED)
          mate_desktop_thumbnail_factory_load_thumbnailers_for_dir (factory, path);

      g_free (path);
      break;
    case G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT:
    case G_FILE_MONITOR_EVENT_ATTRIBUTE_CHANGED:
    case G_FILE_MONITOR_EVENT_PRE_UNMOUNT:
    default:
      break;
    }
}

static void
mate_desktop_thumbnail_factory_load_thumbnailers (MateDesktopThumbnailFactory *factory)
{
  MateDesktopThumbnailFactoryPrivate *priv = factory->priv;
  const gchar * const *dirs;
  guint i;

  if (priv->loaded)
    return;

  dirs = get_thumbnailers_dirs ();
  for (i = 0; dirs[i]; i++)
    {
      mate_desktop_thumbnail_factory_load_thumbnailers_for_dir (factory, dirs[i]);
    }

  priv->loaded = TRUE;
}

static void
external_thumbnailers_disabled_all_changed_cb (GSettings                   *settings,
                                               const gchar                 *key,
                                               MateDesktopThumbnailFactory *factory)
{
  MateDesktopThumbnailFactoryPrivate *priv = factory->priv;

  g_mutex_lock (&priv->lock);

  priv->disabled = g_settings_get_boolean (priv->settings, "disable-all");
  if (priv->disabled)
    {
      g_strfreev (priv->disabled_types);
      priv->disabled_types = NULL;
    }
  else
    {
      priv->disabled_types = g_settings_get_strv (priv->settings, "disable");
      mate_desktop_thumbnail_factory_load_thumbnailers (factory);
    }

  g_mutex_unlock (&priv->lock);
}

static void
external_thumbnailers_disabled_changed_cb (GSettings                   *settings,
                                           const gchar                 *key,
                                           MateDesktopThumbnailFactory *factory)
{
  MateDesktopThumbnailFactoryPrivate *priv = factory->priv;

  g_mutex_lock (&priv->lock);

  if (!priv->disabled)
    {
      g_strfreev (priv->disabled_types);
      priv->disabled_types = g_settings_get_strv (priv->settings, "disable");
    }

  g_mutex_unlock (&priv->lock);
}

static void
mate_desktop_thumbnail_factory_init (MateDesktopThumbnailFactory *factory)
{
  MateDesktopThumbnailFactoryPrivate *priv;

  factory->priv = mate_desktop_thumbnail_factory_get_instance_private (factory);

  priv = factory->priv;

  priv->size = MATE_DESKTOP_THUMBNAIL_SIZE_NORMAL;

  priv->mime_types_map = g_hash_table_new_full (g_str_hash,
                                                g_str_equal,
                                                (GDestroyNotify)g_free,
                                                (GDestroyNotify)thumbnailer_unref);

  g_mutex_init (&priv->lock);

  priv->settings = g_settings_new ("org.mate.thumbnailers");

  g_signal_connect (priv->settings, "changed::disable-all",
                    G_CALLBACK (external_thumbnailers_disabled_all_changed_cb),
                    factory);
  g_signal_connect (priv->settings, "changed::disable",
                    G_CALLBACK (external_thumbnailers_disabled_changed_cb),
                    factory);

  priv->disabled = g_settings_get_boolean (priv->settings, "disable-all");

  if (!priv->disabled)
    priv->disabled_types = g_settings_get_strv (priv->settings, "disable");

  if (!priv->disabled)
    mate_desktop_thumbnail_factory_load_thumbnailers (factory);
}

static void
mate_desktop_thumbnail_factory_finalize (GObject *object)
{
  MateDesktopThumbnailFactory *factory;
  MateDesktopThumbnailFactoryPrivate *priv;
  
  factory = MATE_DESKTOP_THUMBNAIL_FACTORY (object);

  priv = factory->priv;

  if (priv->thumbnailers)
    {
      g_list_free_full (priv->thumbnailers, (GDestroyNotify)thumbnailer_unref);
      priv->thumbnailers = NULL;
    }

  g_clear_pointer (&priv->mime_types_map, g_hash_table_destroy);

  if (priv->monitors)
    {
      g_list_free_full (priv->monitors, (GDestroyNotify)g_object_unref);
      priv->monitors = NULL;
    }

  g_mutex_clear (&priv->lock);

  g_clear_pointer (&priv->disabled_types, g_strfreev);

  if (priv->settings)
    {
      g_signal_handlers_disconnect_by_func (priv->settings,
                                            external_thumbnailers_disabled_all_changed_cb,
                                            factory);
      g_signal_handlers_disconnect_by_func (priv->settings,
                                            external_thumbnailers_disabled_changed_cb,
                                            factory);
      g_clear_object (&priv->settings);
    }

  if (G_OBJECT_CLASS (parent_class)->finalize)
    (* G_OBJECT_CLASS (parent_class)->finalize) (object);
}

static void
mate_desktop_thumbnail_factory_class_init (MateDesktopThumbnailFactoryClass *class)
{
  GObjectClass *gobject_class;

  gobject_class = G_OBJECT_CLASS (class);

  gobject_class->finalize = mate_desktop_thumbnail_factory_finalize;
}

/**
 * mate_desktop_thumbnail_factory_new:
 * @size: The thumbnail size to use
 *
 * Creates a new #MateDesktopThumbnailFactory.
 *
 * This function must be called on the main thread.
 *
 * Return value: a new #MateDesktopThumbnailFactory
 *
 * Since: 2.2
 **/
MateDesktopThumbnailFactory *
mate_desktop_thumbnail_factory_new (MateDesktopThumbnailSize size)
{
  MateDesktopThumbnailFactory *factory;

  factory = g_object_new (MATE_DESKTOP_TYPE_THUMBNAIL_FACTORY, NULL);

  factory->priv->size = size;

  return factory;
}

static char *
thumbnail_filename (const char *uri)
{
  GChecksum *checksum;
  guint8 digest[16];
  gsize digest_len = sizeof (digest);
  char *file;

  checksum = g_checksum_new (G_CHECKSUM_MD5);
  g_checksum_update (checksum, (const guchar *) uri, strlen (uri));

  g_checksum_get_digest (checksum, digest, &digest_len);
  g_assert (digest_len == 16);

  file = g_strconcat (g_checksum_get_string (checksum), ".png", NULL);

  g_checksum_free (checksum);

  return file;
}

static char *
thumbnail_path (const char               *uri,
                MateDesktopThumbnailSize  size)
{
  char *path, *file;

  file = thumbnail_filename (uri);
  path = g_build_filename (g_get_user_cache_dir (),
                           "thumbnails",
                           size == MATE_DESKTOP_THUMBNAIL_SIZE_LARGE ? "large" : "normal",
                           file,
                           NULL);
  g_free (file);
  return path;
}

static char *
thumbnail_failed_path (const char *uri)
{
  char *path, *file;

  file = thumbnail_filename (uri);
  /* XXX: appname is only used for failed thumbnails. Is this a mistake? */
  path = g_build_filename (g_get_user_cache_dir (),
                           "thumbnails",
                           "fail",
                           appname,
                           file,
                           NULL);
  g_free (file);
  return path;
}

static char *
validate_thumbnail_path (char                     *path,
                         const char               *uri,
                         time_t                    mtime,
                         MateDesktopThumbnailSize  size)
{
  GdkPixbuf *pixbuf;

  pixbuf = gdk_pixbuf_new_from_file (path, NULL);
  if (pixbuf == NULL ||
      !mate_desktop_thumbnail_is_valid (pixbuf, uri, mtime)) {
      g_free (path);
      return NULL;
  }

  g_clear_object (&pixbuf);

  return path;
}

static char *
lookup_thumbnail_path (const char               *uri,
                       time_t                    mtime,
                       MateDesktopThumbnailSize  size)
{
  char *path = thumbnail_path (uri, size);
  return validate_thumbnail_path (path, uri, mtime, size);
}

static char *
lookup_failed_thumbnail_path (const char               *uri,
                              time_t                    mtime,
                              MateDesktopThumbnailSize  size)
{
  char *path = thumbnail_failed_path (uri);
  return validate_thumbnail_path (path, uri, mtime, size);
}

/**
 * mate_desktop_thumbnail_factory_lookup:
 * @factory: a #MateDesktopThumbnailFactory
 * @uri: the uri of a file
 * @mtime: the mtime of the file
 *
 * Tries to locate an existing thumbnail for the file specified.
 *
 * Usage of this function is threadsafe.
 *
 * Return value: (transfer full): The absolute path of the thumbnail, or %NULL if none exist.
 *
 * Since: 2.2
 **/
char *
mate_desktop_thumbnail_factory_lookup (MateDesktopThumbnailFactory *factory,
                                       const char                  *uri,
                                       time_t                       mtime)
{
  MateDesktopThumbnailFactoryPrivate *priv = factory->priv;

  g_return_val_if_fail (uri != NULL, NULL);

  return lookup_thumbnail_path (uri, mtime, priv->size);
}

/**
 * mate_desktop_thumbnail_factory_has_valid_failed_thumbnail:
 * @factory: a #MateDesktopThumbnailFactory
 * @uri: the uri of a file
 * @mtime: the mtime of the file
 *
 * Tries to locate an failed thumbnail for the file specified. Writing
 * and looking for failed thumbnails is important to avoid to try to
 * thumbnail e.g. broken images several times.
 *
 * Usage of this function is threadsafe.
 *
 * Return value: TRUE if there is a failed thumbnail for the file.
 *
 * Since: 2.2
 **/
gboolean
mate_desktop_thumbnail_factory_has_valid_failed_thumbnail (MateDesktopThumbnailFactory *factory,
                                                           const char                  *uri,
                                                           time_t                       mtime)
{
  char *path;

  g_return_val_if_fail (uri != NULL, FALSE);

  path = lookup_failed_thumbnail_path (uri, mtime, factory->priv->size);
  if (path == NULL)
    return FALSE;

  g_free (path);

  return TRUE;
}

/**
 * mate_desktop_thumbnail_factory_can_thumbnail:
 * @factory: a #MateDesktopThumbnailFactory
 * @uri: the uri of a file
 * @mime_type: the mime type of the file
 * @mtime: the mtime of the file
 *
 * Returns TRUE if this MateIconFactory can (at least try) to thumbnail
 * this file. Thumbnails or files with failed thumbnails won't be thumbnailed.
 *
 * Usage of this function is threadsafe.
 *
 * Return value: TRUE if the file can be thumbnailed.
 *
 * Since: 2.2
 **/
gboolean
mate_desktop_thumbnail_factory_can_thumbnail (MateDesktopThumbnailFactory *factory,
                                              const char                  *uri,
                                              const char                  *mime_type,
                                              time_t                       mtime)
{
  gboolean have_script = FALSE;

  /* Don't thumbnail thumbnails */
  if (uri &&
      strncmp (uri, "file:/", 6) == 0 &&
      (strstr (uri, "/.thumbnails/") != NULL ||
      strstr (uri, "/.cache/thumbnails/") != NULL))
    return FALSE;

  if (!mime_type)
    return FALSE;

  g_mutex_lock (&factory->priv->lock);
  if (!mate_desktop_thumbnail_factory_is_disabled (factory, mime_type))
    {
      Thumbnailer *thumb;

      thumb = g_hash_table_lookup (factory->priv->mime_types_map, mime_type);
      have_script = thumbnailer_try_exec (thumb);
    }
  g_mutex_unlock (&factory->priv->lock);

  if (uri && (have_script ))
    {
      return !mate_desktop_thumbnail_factory_has_valid_failed_thumbnail (factory,
                                                                         uri,
                                                                         mtime);
    }

  return FALSE;
}

static char *
expand_thumbnailing_script (const char *script,
                            const int   size,
                            const char *inuri,
                            const char *outfile)
{
  GString *str;
  const char *p, *last;
  char *localfile, *quoted;
  gboolean got_in;

  str = g_string_new (NULL);

  got_in = FALSE;
  last = script;
  while ((p = strchr (last, '%')) != NULL)
    {
      g_string_append_len (str, last, p - last);
      p++;

      switch (*p) {
      case 'u':
    quoted = g_shell_quote (inuri);
    g_string_append (str, quoted);
    g_free (quoted);
    got_in = TRUE;
    p++;
    break;
      case 'i':
    localfile = g_filename_from_uri (inuri, NULL, NULL);
    if (localfile)
      {
        quoted = g_shell_quote (localfile);
        g_string_append (str, quoted);
        got_in = TRUE;
        g_free (quoted);
        g_free (localfile);
      }
    p++;
    break;
      case 'o':
    quoted = g_shell_quote (outfile);
    g_string_append (str, quoted);
    g_free (quoted);
    p++;
    break;
      case 's':
    g_string_append_printf (str, "%d", size);
    p++;
    break;
      case '%':
    g_string_append_c (str, '%');
    p++;
    break;
      case 0:
      default:
    break;
      }
      last = p;
    }
  g_string_append (str, last);

  if (got_in)
    return g_string_free (str, FALSE);

  g_string_free (str, TRUE);
  return NULL;
}

static GdkPixbuf *
get_preview_thumbnail (const char *uri,
                       int         size)
{
    GdkPixbuf *pixbuf;
    GFile *file;
    GFileInfo *file_info;
    GInputStream *input_stream;
    GObject *object;

    g_return_val_if_fail (uri != NULL, NULL);

    input_stream = NULL;

    file = g_file_new_for_uri (uri);

    /* First see if we can get an input stream via preview::icon  */
    file_info = g_file_query_info (file,
                                   G_FILE_ATTRIBUTE_PREVIEW_ICON,
                                   G_FILE_QUERY_INFO_NONE,
                                   NULL,  /* GCancellable */
                                   NULL); /* return location for GError */
    g_object_unref (file);

    if (file_info == NULL)
      return NULL;

    object = g_file_info_get_attribute_object (file_info,
                                               G_FILE_ATTRIBUTE_PREVIEW_ICON);
    if (object)
        g_object_ref (object);
    g_object_unref (file_info);

    if (!object)
      return NULL;
    if (!G_IS_LOADABLE_ICON (object)) {
      g_object_unref (object);
      return NULL;
    }

    input_stream = g_loadable_icon_load (G_LOADABLE_ICON (object),
                                         0,     /* size */
                                         NULL,  /* return location for type */
                                         NULL,  /* GCancellable */
                                         NULL); /* return location for GError */
    g_object_unref (object);

    if (!input_stream)
      return NULL;

    pixbuf = gdk_pixbuf_new_from_stream_at_scale (input_stream,
                                                  size, size,
                                                  TRUE, NULL, NULL);
    g_object_unref (input_stream);

    return pixbuf;
}

/**
 * mate_desktop_thumbnail_factory_generate_thumbnail:
 * @factory: a #MateDesktopThumbnailFactory
 * @uri: the uri of a file
 * @mime_type: the mime type of the file
 *
 * Tries to generate a thumbnail for the specified file. If it succeeds
 * it returns a pixbuf that can be used as a thumbnail.
 *
 * Usage of this function is threadsafe.
 *
 * Return value: (transfer full): thumbnail pixbuf if thumbnailing succeeded, %NULL otherwise.
 *
 * Since: 2.2
 **/
GdkPixbuf *
mate_desktop_thumbnail_factory_generate_thumbnail (MateDesktopThumbnailFactory *factory,
                                                   const char                  *uri,
                                                   const char                  *mime_type)
{
  GdkPixbuf *pixbuf;
  char *script, *expanded_script;
  int size;
  int exit_status;
  char *tmpname;

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

  /* Doesn't access any volatile fields in factory, so it's threadsafe */

  size = 128;
  if (factory->priv->size == MATE_DESKTOP_THUMBNAIL_SIZE_LARGE)
    size = 256;

  pixbuf = NULL;

  pixbuf = get_preview_thumbnail (uri, size);
  if (pixbuf != NULL)
    return pixbuf;

  script = NULL;
  g_mutex_lock (&factory->priv->lock);
  if (!mate_desktop_thumbnail_factory_is_disabled (factory, mime_type))
    {
      Thumbnailer *thumb;

      thumb = g_hash_table_lookup (factory->priv->mime_types_map, mime_type);
      if (thumb)
        script = g_strdup (thumb->command);
    }
  g_mutex_unlock (&factory->priv->lock);

  if (script)
    {
      int fd;

      fd = g_file_open_tmp (".mate_desktop_thumbnail.XXXXXX", &tmpname, NULL);

      if (fd != -1)
    {
      close (fd);

      expanded_script = expand_thumbnailing_script (script, size, uri, tmpname);
      if (expanded_script != NULL &&
          g_spawn_command_line_sync (expanded_script,
                     NULL, NULL, &exit_status, NULL) &&
          exit_status == 0)
        {
          pixbuf = gdk_pixbuf_new_from_file (tmpname, NULL);
        }

      g_free (expanded_script);
      g_unlink (tmpname);
      g_free (tmpname);
    }

      g_free (script);
    }

  return pixbuf;
}

static gboolean
save_thumbnail (GdkPixbuf  *pixbuf,
                char       *path,
                const char *uri,
                time_t      mtime)
{
  char *dirname;
  char *tmp_path = NULL;
  int tmp_fd;
  gchar *mtime_str;
  gboolean ret = FALSE;
  GError *error = NULL;
  const char *width, *height;

  if (pixbuf == NULL)
    return FALSE;

  dirname = g_path_get_dirname (path);

  if (g_mkdir_with_parents (dirname, 0700) != 0)

    goto out;

  tmp_path = g_strconcat (path, ".XXXXXX", NULL);
  tmp_fd = g_mkstemp (tmp_path);

  if (tmp_fd == -1)
    goto out;
  close (tmp_fd);

  mtime_str = g_strdup_printf ("%" G_GINT64_FORMAT,  (gint64) mtime);
  width = gdk_pixbuf_get_option (pixbuf, "tEXt::Thumb::Image::Width");
  height = gdk_pixbuf_get_option (pixbuf, "tEXt::Thumb::Image::Height");

  error = NULL;
  if (width != NULL && height != NULL)
    ret = gdk_pixbuf_save (pixbuf,
                           tmp_path,
                           "png", &error,
                           "tEXt::Thumb::Image::Width", width,
                           "tEXt::Thumb::Image::Height", height,
                           "tEXt::Thumb::URI", uri,
                           "tEXt::Thumb::MTime", mtime_str,
                           "tEXt::Software", "MATE::ThumbnailFactory",
                           NULL);
  else
    ret = gdk_pixbuf_save (pixbuf,
                           tmp_path,
                           "png", &error,
                           "tEXt::Thumb::URI", uri,
                           "tEXt::Thumb::MTime", mtime_str,
                           "tEXt::Software", "MATE::ThumbnailFactory",
                           NULL);
  g_free (mtime_str);

  if (!ret)
    goto out;

  g_chmod (tmp_path, 0600);
  g_rename (tmp_path, path);

 out:
  if (error != NULL)
    {
      g_warning ("Failed to create thumbnail %s: %s", tmp_path, error->message);
      g_error_free (error);
    }
  g_unlink (tmp_path);
  g_free (tmp_path);
  g_free (dirname);
  return ret;
}

static GdkPixbuf *
make_failed_thumbnail (void)
{
  GdkPixbuf *pixbuf;

  pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, 1, 1);
  gdk_pixbuf_fill (pixbuf, 0x00000000);
  return pixbuf;
}

/**
 * mate_desktop_thumbnail_factory_save_thumbnail:
 * @factory: a #MateDesktopThumbnailFactory
 * @thumbnail: the thumbnail as a pixbuf
 * @uri: the uri of a file
 * @original_mtime: the modification time of the original file
 *
 * Saves @thumbnail at the right place. If the save fails a
 * failed thumbnail is written.
 *
 * Usage of this function is threadsafe.
 *
 * Since: 2.2
 **/
void
mate_desktop_thumbnail_factory_save_thumbnail (MateDesktopThumbnailFactory *factory,
                                               GdkPixbuf                   *thumbnail,
                                               const char                  *uri,
                                               time_t                       original_mtime)
{
  char *path;

  path = thumbnail_path (uri, factory->priv->size);
  if (!save_thumbnail (thumbnail, path, uri, original_mtime))
    {
      thumbnail = make_failed_thumbnail ();
      g_free (path);
      path = thumbnail_failed_path (uri);
      save_thumbnail (thumbnail, path, uri, original_mtime);
      g_object_unref (thumbnail);
    }
  g_free (path);
}

/**
 * mate_desktop_thumbnail_factory_create_failed_thumbnail:
 * @factory: a #MateDesktopThumbnailFactory
 * @uri: the uri of a file
 * @mtime: the modification time of the file
 *
 * Creates a failed thumbnail for the file so that we don't try
 * to re-thumbnail the file later.
 *
 * Usage of this function is threadsafe.
 *
 * Since: 2.2
 **/
void
mate_desktop_thumbnail_factory_create_failed_thumbnail (MateDesktopThumbnailFactory *factory,
                                                        const char                  *uri,
                                                        time_t                      mtime)
{
  char *path;
  GdkPixbuf *pixbuf;

  path = thumbnail_failed_path (uri);
  pixbuf = make_failed_thumbnail ();
  save_thumbnail (pixbuf, path, uri, mtime);

  g_free (path);
  g_object_unref (pixbuf);
}

/**
 * mate_desktop_thumbnail_md5:
 * @uri: an uri
 *
 * Calculates the MD5 checksum of the uri. This can be useful
 * if you want to manually handle thumbnail files.
 *
 * Return value: A string with the MD5 digest of the uri string.
 *
 * Since: 2.2
 * Deprecated: 2.22: Use #GChecksum instead
 **/
char *
mate_desktop_thumbnail_md5 (const char *uri)
{
  return g_compute_checksum_for_data (G_CHECKSUM_MD5,
                                      (const guchar *) uri,
                                      strlen (uri));
}

/**
 * mate_desktop_thumbnail_path_for_uri:
 * @uri: an uri
 * @size: a thumbnail size
 *
 * Returns the filename that a thumbnail of size @size for @uri would have.
 *
 * Return value: an absolute filename
 *
 * Since: 2.2
 **/
char *
mate_desktop_thumbnail_path_for_uri (const char               *uri,
                                     MateDesktopThumbnailSize  size)
{
  return thumbnail_path (uri, size);
}

/**
 * mate_desktop_thumbnail_has_uri:
 * @pixbuf: an loaded thumbnail pixbuf
 * @uri: a uri
 *
 * Returns whether the thumbnail has the correct uri embedded in the
 * Thumb::URI option in the png.
 *
 * Return value: TRUE if the thumbnail is for @uri
 *
 * Since: 2.2
 **/
gboolean
mate_desktop_thumbnail_has_uri (GdkPixbuf          *pixbuf,
                                const char         *uri)
{
  const char *thumb_uri;

  thumb_uri = gdk_pixbuf_get_option (pixbuf, "tEXt::Thumb::URI");
  if (!thumb_uri)
    return FALSE;

  return strcmp (uri, thumb_uri) == 0;
}

/**
 * mate_desktop_thumbnail_is_valid:
 * @pixbuf: an loaded thumbnail #GdkPixbuf
 * @uri: a uri
 * @mtime: the mtime
 *
 * Returns whether the thumbnail has the correct uri and mtime embedded in the
 * png options.
 *
 * Return value: TRUE if the thumbnail has the right @uri and @mtime
 *
 * Since: 2.2
 **/
gboolean
mate_desktop_thumbnail_is_valid (GdkPixbuf          *pixbuf,
                                 const char         *uri,
                                 time_t              mtime)
{
  const char *thumb_uri, *thumb_mtime_str;
  time_t thumb_mtime;

  thumb_uri = gdk_pixbuf_get_option (pixbuf, "tEXt::Thumb::URI");
  if (!thumb_uri)
    return FALSE;
  if (strcmp (uri, thumb_uri) != 0)
    return FALSE;

  thumb_mtime_str = gdk_pixbuf_get_option (pixbuf, "tEXt::Thumb::MTime");
  if (!thumb_mtime_str)
    return FALSE;
  thumb_mtime = (time_t)g_ascii_strtoll (thumb_mtime_str, (gchar**)NULL, 10);
  if (mtime != thumb_mtime)
    return FALSE;

  return TRUE;
}