aboutsummaryrefslogtreecommitdiff
path: root/src/arctica-greeter.vala
blob: ecbcc0182f9d101ae8cf7321e28a3c8c45107472 (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
/* -*- Mode: Vala; indent-tabs-mode: nil; tab-width: 4 -*-
 *
 * Copyright (C) 2011 Canonical Ltd
 * Copyright (C) 2015-2017 Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 * Authors: Robert Ancell <robert.ancell@canonical.com>
 *          Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
 */

public const int grid_size = 40;

[SingleInstance]
public class ArcticaGreeter : Object
{
    public signal void show_message (string text, LightDM.MessageType type);
    public signal void show_prompt (string text, LightDM.PromptType type);
    public signal void authentication_complete ();
    public signal void starting_session ();

    public bool test_mode { get; construct; default = false; }
    public bool test_highcontrast { get; construct; default = false; }
    public bool test_bigfont { get; construct; default = false; }
    private string state_file;
    private KeyFile state;

    private Cairo.XlibSurface background_surface;

    private SettingsDaemon settings_daemon;

    public bool orca_needs_kick;
    private MainWindow main_window;

    private LightDM.Greeter greeter;

    private Canberra.Context canberra_context;

    private static Timer log_timer;

    private DialogDBusInterface dbus_object;
    private SettingsDaemonDBusInterface  settings_daemon_proxy;
    public signal void xsettings_ready ();
    public signal void greeter_ready ();

    construct
    {
        greeter = new LightDM.Greeter ();
        greeter.show_message.connect ((text, type) => { show_message (text, type); });
        greeter.show_prompt.connect ((text, type) => { show_prompt (text, type); });
        greeter.autologin_timer_expired.connect (() => {
            try
            {
                greeter.authenticate_autologin ();
            }
            catch (Error e)
            {
                warning ("Failed to autologin authenticate: %s", e.message);
            }
        });
        greeter.authentication_complete.connect (() => { authentication_complete (); });
        var connected = false;
        try
        {
            connected = greeter.connect_to_daemon_sync ();
        }
        catch (Error e)
        {
            warning ("Failed to connect to LightDM daemon: %s", e.message);
        }
        if (!connected && !test_mode)
            Posix.exit (Posix.EXIT_FAILURE);

        if (!test_mode)
        {
            settings_daemon = new SettingsDaemon ();
            settings_daemon.start ();
        }

        var state_dir = Path.build_filename (Environment.get_user_cache_dir (), "arctica-greeter");
        DirUtils.create_with_parents (state_dir, 0775);

        var xdg_seat = GLib.Environment.get_variable("XDG_SEAT");
        var state_file_name = xdg_seat != null && xdg_seat != "seat0" ? xdg_seat + "-state" : "state";

        state_file = Path.build_filename (state_dir, state_file_name);
        state = new KeyFile ();
        try
        {
            state.load_from_file (state_file, KeyFileFlags.NONE);
        }
        catch (Error e)
        {
            if (!(e is FileError.NOENT))
                warning ("Failed to load state from %s: %s\n", state_file, e.message);
        }
    }

    /*
     * Note that we need a way to specify a parameter for the initial instance
     * creation of the singleton, but also a constructor that takes no
     * parameters for later usage.
     *
     * Making the parameter optional is a good compromise.
     *
     * This this parameter is construct-only, initializing it by passing it to
     * the GObject constructor is both the correct way to do it, and it will
     * additionally avoid changing it in later calls of our constructor.
     */
    public ArcticaGreeter (bool test_mode_ = false,
                           bool test_highcontrast_ = false,
                           bool test_bigfont_ = false)
    {
        Object (test_mode: test_mode_,
                test_highcontrast: test_highcontrast_,
                test_bigfont: test_bigfont_
        );
    }

    public void go ()
    {
        /* Render things after xsettings is ready */
        xsettings_ready.connect ( xsettings_ready_cb );

        if (!test_mode) {

            GLib.Bus.watch_name (BusType.SESSION, "org.mate.SettingsDaemon", BusNameWatcherFlags.NONE,
                                 (c, name, owner) =>
                                 {
                                    try {
                                        settings_daemon_proxy = GLib.Bus.get_proxy_sync (
                                            BusType.SESSION, "org.mate.SettingsDaemon", "/org/mate/SettingsDaemon");
                                        settings_daemon_proxy.plugin_activated.connect (
                                            (name) =>
                                            {
                                                if (name == "xsettings") {
                                                    debug ("xsettings is ready");
                                                    xsettings_ready ();
                                                } else {
                                                    debug ("settings-daemon plugin %s loaded", name);
                                                }
                                            }
                                        );
                                    }
                                    catch (Error e)
                                    {
                                        debug ("Failed to get MSD proxy, proceed anyway");
                                        xsettings_ready ();
                                    }
                                },
                                null);
        }
        else
        {
            xsettings_ready ();
        }
    }

    public string? get_state (string key)
    {
        try
        {
            return state.get_value ("greeter", key);
        }
        catch (Error e)
        {
            return null;
        }
    }

    public void set_state (string key, string value)
    {
        state.set_value ("greeter", key, value);
        var data = state.to_data ();
        try
        {
            FileUtils.set_contents (state_file, data);
        }
        catch (Error e)
        {
            debug ("Failed to write state: %s", e.message);
        }
    }

    public void push_list (GreeterList widget)
    {
        main_window.push_list (widget);
    }

    public void pop_list ()
    {
        main_window.pop_list ();
    }

    public static void add_style_class (Gtk.Widget widget)
    {
        /* Add style context class lightdm-user-list */
        var ctx = widget.get_style_context ();
        ctx.add_class ("lightdm");
    }

    public string? get_default_session ()
    {
        var sessions = new List<string> ();
        sessions.append ("lightdm-xsession");

        // FIXME: this list should be obtained from AGSettings, ideally...
        sessions.append ("mate");
        sessions.append ("xfce");
        sessions.append ("kde-plasma");
        sessions.append ("kde");
        sessions.append ("gnome");
        sessions.append ("cinnamon");
        sessions.append ("lomiri");

        foreach (string session in sessions) {
            var path = Path.build_filename  ("/usr/share/wayland-sessions/", session.concat(".desktop"), null);
            if (FileUtils.test (path, FileTest.EXISTS)) {
                debug ("Using %s as default (Wayland) session.", session);
                return session;
            }
        }

        foreach (string session in sessions) {
            var path = Path.build_filename  ("/usr/share/xsessions/", session.concat(".desktop"), null);
            if (FileUtils.test (path, FileTest.EXISTS)) {
                debug ("Using %s as default (X11) session.", session);
                return session;
            }
        }

        warning ("Could not find a default session. Falling back to LightDM's system default.");
        return greeter.default_session_hint;
    }

    public string validate_session (string? session)
    {
        /* Make sure the given session actually exists. Return it if it does.
         * otherwise, return the default session.
         */
        if (session != null) {
            var path = Path.build_filename  ("/usr/share/xsessions/", session.concat(".desktop"), null);
            var waypath = Path.build_filename  ("/usr/share/wayland-sessions/", session.concat(".desktop"), null);
            if (!FileUtils.test (path, FileTest.EXISTS) & !FileUtils.test (waypath, FileTest.EXISTS)) {
                debug ("Invalid session: '%s'", session);
                session = null;
            }
        }

        if (session == null) {
            var default_session = get_default_session ();
            debug ("Invalid session: '%s'. Using session '%s' instead.", session, default_session);
            return default_session;
        }

        return session;
    }

    public bool start_session (string? session, Background bg)
    {
        /* Explicitly set the right scale before closing window */
        var display = Gdk.Display.get_default();
        var monitor = display.get_primary_monitor();
        var scale = monitor.get_scale_factor ();
        var _session = session;
        background_surface.set_device_scale (scale, scale);

        main_window.before_session_start();

        if (test_mode)
        {
            debug ("Successfully logged in! Quitting...");
            Gtk.main_quit ();
            return true;
        }

        if (!session_is_valid (_session))
        {
            debug ("Session %s is not available, using system default %s instead", _session, default_session_hint());
            _session = default_session_hint();
        }

        var result = false;
        try
        {
            result = LightDM.greeter_start_session_sync (greeter, _session);
        }
        catch (Error e)
        {
            warning ("Failed to start session: %s", e.message);
        }

        if (result)
            starting_session ();

        return result;
    }

    private bool session_is_valid (string? session)
    {
        if (session == null)
            return true;

        foreach (var s in LightDM.get_sessions ())
            if (s.key == session)
                return true;

        return false;
    }

    private bool ready_cb ()
    {
        debug ("starting system-ready sound");

        /* Launch canberra */
        Canberra.Context.create (out canberra_context);

        if (AGSettings.get_boolean (AGSettings.KEY_PLAY_READY_SOUND))
            canberra_context.play (0,
                                   Canberra.PROP_CANBERRA_XDG_THEME_NAME,
                                   "arctica-greeter",
                                   Canberra.PROP_EVENT_ID,
                                   "system-ready");

        /* Synchronize properties in AGSettings once. */
        var agsettings = new AGSettings ();
        if (!test_mode) {
            agsettings.high_contrast = !(!(agsettings.high_contrast));
            agsettings.big_font = !(!(agsettings.big_font));
        } else {
            agsettings.high_contrast = test_highcontrast;
            agsettings.big_font = test_bigfont;
        }

        /*
         * Add timeouts to process the full node hierarchy to handle a11y
         * changes.
         *
         * That's the easiest way to handle a changing node hierarchy.
         *
         * Alternatives would involve connecting a function for every a11y
         * change to the GtkWidget::parent-set event to *every widget* we
         * create, but that would make the code incredibly messy.
         *
         * The value has been determined by a fair dice roll and should make
         * sure that changes are visible almost instantaneously to users.
         */
        Timeout.add_full (GLib.Priority.HIGH_IDLE, 302, () => {
            var agsettings_intimer = new AGSettings ();
            /*
            if (0 == GLib.Random.int_range (0, 10)) {
                debug ("Syncing up high contrast value via timer: %s", agsettings_intimer.high_contrast.to_string ());
            }
            */
            switch_contrast (agsettings_intimer.high_contrast);

            return true;
        });
        Timeout.add_full (GLib.Priority.HIGH_IDLE, 302, () => {
            var agsettings_intimer = new AGSettings ();
            /*
            if (0 == GLib.Random.int_range (0, 10)) {
                debug ("Syncing up big font value via timer: %s", agsettings_intimer.big_font.to_string ());
            }
            */
            switch_font (agsettings_intimer.big_font);

            return true;
        });

        return false;
    }

    public void show ()
    {
        debug ("Showing main window");
        if (!test_mode)
            main_window.set_decorated (false);
        main_window.show ();
        main_window.get_window ().focus (Gdk.CURRENT_TIME);
        main_window.set_keyboard_state ();
    }

    public bool is_authenticated ()
    {
        return greeter.is_authenticated;
    }

    public void authenticate (string? userid = null)
    {
        try
        {
            greeter.authenticate (userid);
        }
        catch (Error e)
        {
            warning ("Failed to authenticate: %s", e.message);
        }
    }

    public void authenticate_as_guest ()
    {
        try
        {
            greeter.authenticate_as_guest ();
        }
        catch (Error e)
        {
            warning ("Failed to authenticate as guest: %s", e.message);
        }
    }

    public void authenticate_remote (string? session, string? userid)
    {
        try
        {
            greeter.authenticate_remote (session, userid);
        }
        catch (Error e)
        {
            warning ("Failed to remote authenticate: %s", e.message);
        }
    }

    public void cancel_authentication ()
    {
        try
        {
            greeter.cancel_authentication ();
        }
        catch (Error e)
        {
            warning ("Failed to cancel authentication: %s", e.message);
        }
    }

    public void respond (string response)
    {
        try
        {
            greeter.respond (response);
        }
        catch (Error e)
        {
            warning ("Failed to respond: %s", e.message);
        }
    }

    public string authentication_user ()
    {
        return greeter.authentication_user;
    }

    public string default_session_hint ()
    {
        return greeter.default_session_hint;
    }

    public string select_user_hint ()
    {
        return greeter.select_user_hint;
    }

    public bool show_manual_login_hint ()
    {
        return greeter.show_manual_login_hint;
    }

    public bool show_remote_login_hint ()
    {
        return greeter.show_remote_login_hint;
    }

    public bool hide_users_hint ()
    {
        return greeter.hide_users_hint;
    }

    public bool has_guest_account_hint ()
    {
        return greeter.has_guest_account_hint;
    }

    private delegate void SwitchClassType (Gtk.Widget widget, string classname, bool enable);

    private delegate void IterateChildrenType (Gtk.Widget widget);

    private void switch_generic (Gtk.Widget widget, string classname, bool enable)
    {
        var style_ctx = widget.get_style_context ();
        if (enable)
        {
            style_ctx.add_class (classname);
        }
        else
        {
            style_ctx.remove_class (classname);
        }
    }

    private void iterate_children_generic (Gtk.Widget widget, SwitchClassType switch_func, string classname, bool enable)
    {
        /*
         * GTK 4 changed its API quite dramatically, got rid of GtkContainer
         * and made each GtkWidget accept children, while also defining a new
         * way to access those.
         */
        IterateChildrenType rec_func = null;
        rec_func = (widget) => {
#if HAVE_GTK_4_0
            Gtk.Widget child = widget.get_first_child ();
            while (null != child)
            {
                rec_func (child);
                child = child.get_next_sibling ();
            }
#else
            if (gtk_is_container (widget))
            {
                ((Gtk.Container)(widget)).@foreach (rec_func);
            }
#endif

            /* Common code to add or remove the CSS class. */
            switch_func (widget, classname, enable);
        };

        /*
         * Actually recursively iterate through this item and all of its
         * children.
         */
        rec_func (widget);
    }

    public void switch_contrast (bool high)
    {
        var time_pre = GLib.get_monotonic_time ();
        iterate_children_generic (main_window, switch_generic, "high_contrast", high);
        var time_post = GLib.get_monotonic_time ();
        var time_diff = time_post - time_pre;
        assert (0 <= time_diff);
        // var time_diff_sec = time_diff / 1000000;
        // var time_diff_msec = time_diff / 1000;
        // var time_diff_usec = time_diff % 1000000;
        // debug ("Time passed: %" + int64.FORMAT + " s, %" + int64.FORMAT + " ms, %" + int64.FORMAT + " us", time_diff_sec, time_diff_msec, time_diff_usec);
    }

    public void switch_font (bool big)
    {
        iterate_children_generic (main_window, switch_generic, "big_font", big);
    }

    private Gdk.FilterReturn focus_upon_map (Gdk.XEvent gxevent, Gdk.Event event)
    {
        var xevent = (X.Event*)gxevent;
        if (xevent.type == X.EventType.MapNotify)
        {
            var display = Gdk.X11.Display.lookup_for_xdisplay (xevent.xmap.display);
            var xwin = xevent.xmap.window;
            var win = new Gdk.X11.Window.foreign_for_display (display, xwin);
            if (win != null && !xevent.xmap.override_redirect)
            {
                /* Check to see if this window is our onboard window, since we don't want to focus it. */
                X.Window keyboard_xid = 0;
                if (main_window.menubar.keyboard_window != null)
                    keyboard_xid = (main_window.menubar.keyboard_window.get_window () as Gdk.X11.Window).get_xid ();

                if (xwin != keyboard_xid && win.get_type_hint() != Gdk.WindowTypeHint.NOTIFICATION)
                {
                    win.focus (Gdk.CURRENT_TIME);

                    /* Make sure to keep keyboard above */
                    if (main_window.menubar.keyboard_window != null)
                        main_window.menubar.keyboard_window.get_window ().raise ();
                }
            }
        }
        else if (xevent.type == X.EventType.UnmapNotify)
        {
            // Since we aren't keeping track of focus (for example, we don't
            // track the Z stack of windows) like a normal WM would, when we
            // decide here where to return focus after another window unmaps,
            // we don't have much to go on.  X will tell us if we should take
            // focus back.  (I could not find an obvious way to determine this,
            // but checking if the X input focus is RevertTo.None seems
            // reliable.)

            X.Window xwin;
            int revert_to;
            xevent.xunmap.display.get_input_focus (out xwin, out revert_to);

            if (revert_to == X.RevertTo.None)
            {
                main_window.get_window ().focus (Gdk.CURRENT_TIME);

                /* Make sure to keep keyboard above */
                if (main_window.menubar.keyboard_window != null)
                    main_window.menubar.keyboard_window.get_window ().raise ();
            }
        }
        return Gdk.FilterReturn.CONTINUE;
    }

    private void start_fake_wm ()
    {
        /* We want new windows (e.g. the shutdown dialog) to gain focus.
           We don't really need anything more than that (don't need alt-tab
           since any dialog should be "modal" or at least dealt with before
           continuing even if not actually marked as modal) */
        var root = Gdk.get_default_root_window ();
        root.set_events (root.get_events () | Gdk.EventMask.SUBSTRUCTURE_MASK);
        root.add_filter (focus_upon_map);
    }

    private void kill_fake_wm ()
    {
        var root = Gdk.get_default_root_window ();
        root.remove_filter (focus_upon_map);
    }

    private static Cairo.XlibSurface? create_root_surface (Gdk.Screen screen)
    {
        var visual = screen.get_system_visual ();

        unowned X.Display display = (screen.get_display () as Gdk.X11.Display).get_xdisplay ();
        unowned X.Screen xscreen = (screen as Gdk.X11.Screen).get_xscreen ();

        var pixmap = X.CreatePixmap (display,
                                     (screen.get_root_window () as Gdk.X11.Window).get_xid (),
                                     xscreen.width_of_screen (),
                                     xscreen.height_of_screen (),
                                     visual.get_depth ());

        /* Convert into a Cairo surface */
        var surface = new Cairo.XlibSurface (display,
                                             pixmap,
                                             (visual as Gdk.X11.Visual).get_xvisual (),
                                             xscreen.width_of_screen (), xscreen.height_of_screen ());

        return surface;
    }

    private static void log_cb (string? log_domain, LogLevelFlags log_level, string message)
    {
        string prefix;
        switch (log_level & LogLevelFlags.LEVEL_MASK)
        {
        case LogLevelFlags.LEVEL_ERROR:
            prefix = "ERROR:";
            break;
        case LogLevelFlags.LEVEL_CRITICAL:
            prefix = "CRITICAL:";
            break;
        case LogLevelFlags.LEVEL_WARNING:
            prefix = "WARNING:";
            break;
        case LogLevelFlags.LEVEL_MESSAGE:
            prefix = "MESSAGE:";
            break;
        case LogLevelFlags.LEVEL_INFO:
            prefix = "INFO:";
            break;
        case LogLevelFlags.LEVEL_DEBUG:
            prefix = "DEBUG:";
            break;
        default:
            prefix = "LOG:";
            break;
        }

        stderr.printf ("[%+.2fs] %s %s\n", log_timer.elapsed (), prefix, message);
    }

    private void xsettings_ready_cb ()
    {
        /* Prepare to set the background */
        debug ("Creating background surface");
        background_surface = create_root_surface (Gdk.Screen.get_default ());

        main_window = new MainWindow ();

        main_window.destroy.connect(() => { kill_fake_wm (); });
        main_window.delete_event.connect(() =>
        {
            Gtk.main_quit();
            return false;
        });

        if (!test_mode) {
            Bus.own_name (BusType.SESSION, "com.lomiri.LomiriGreeter", BusNameOwnerFlags.NONE);

            dbus_object = new DialogDBusInterface ();
            dbus_object.open_dialog.connect ((type) =>
            {
                ShutdownDialogType dialog_type;
                switch (type)
                {
                default:
                case 1:
                    dialog_type = ShutdownDialogType.SHUTDOWN;
                    break;
                case 2:
                    dialog_type = ShutdownDialogType.RESTART;
                    break;
                }
                main_window.show_shutdown_dialog (dialog_type);
            });
            dbus_object.close_dialog.connect ((type) => { main_window.close_shutdown_dialog (); });
            Bus.own_name (BusType.SESSION, "com.lomiri.Shell", BusNameOwnerFlags.NONE,
                          (c) =>
                          {
                              try
                              {
                                  c.register_object ("/org/gnome/SessionManager/EndSessionDialog", dbus_object);
                              }
                              catch (Error e)
                              {
                                  warning ("Failed to register /org/gnome/SessionManager/EndSessionDialog: %s", e.message);
                              }
                          },
                          null,
                          () => debug ("Failed to acquire name com.lomiri.Shell"));
        }

        start_fake_wm ();
        Gdk.threads_add_idle (ready_cb);
        greeter_ready ();
    }

    private static void set_keyboard_layout ()
    {

        /* Avoid expensive Python execution where possible */
        if (!FileUtils.test("/etc/default/keyboard", FileTest.EXISTS)) {
            return;
        }

        try {
            Process.spawn_command_line_sync(Path.build_filename (Config.PKGLIBEXECDIR, "arctica-greeter-set-keyboard-layout"), null, null, null);
        }
        catch (Error e){
            warning ("Error while setting the keyboard layout: %s", e.message);
        }
    }

    private static void enable_tap_to_click ()
    {
        try {
            Process.spawn_command_line_sync(Path.build_filename (Config.PKGLIBEXECDIR, "arctica-greeter-enable-tap-to-click"), null, null, null);
        }
        catch (Error e){
            warning ("Error while enabling tap-to-click: %s", e.message);
        }
    }

    private static void activate_numlock ()
    {
        try {
            Process.spawn_command_line_sync("/usr/bin/numlockx on", null, null, null);
        }
        catch (Error e){
            warning ("Error while activating numlock: %s", e.message);
        }
    }

    private static void activate_upower ()
    {
        /* hacky approach, but does what's needed: activate the upower service over DBus */
        try {
            Process.spawn_command_line_sync("/usr/bin/upower --version", null, null, null);
        }
        catch (Error e){
            warning ("Error while triggering UPower activation: %s", e.message);
        }
    }

    private static void check_hidpi ()
    {
        try {
            string output;
            Process.spawn_command_line_sync(Path.build_filename (Config.PKGLIBEXECDIR, "arctica-greeter-check-hidpi"), out output, null, null);
            output = output.strip();
            if (output == "2") {
                debug ("Activating HiDPI (2x scale ratio)");
                GLib.Environment.set_variable ("GDK_SCALE", "2", true);
            }
        }
        catch (Error e){
            warning ("Error while setting HiDPI support: %s", e.message);
        }
    }

    public static int main (string[] args)
    {
        /* Protect memory from being paged to disk, as we deal with passwords

           According to systemd-dev,

           "mlockall() is generally a bad idea and certainly has no place in a graphical program.
           A program like this uses lots of memory and it is crucial that this memory can be paged
           out to relieve memory pressure."

           With systemd version 239 the ulimit for RLIMIT_MEMLOCK was set to 16 MiB
           and therefore the mlockall call would fail. This is lucky because the subsequent mmap would not fail.

           With systemd version 240 the RLIMIT_MEMLOCK is now set to 64 MiB
           and now the mlockall no longer fails. However, it not possible to mmap in all
           the memory and because that would still exceed the MEMLOCK limit.
           "
           See https://bugzilla.redhat.com/show_bug.cgi?id=1662857 &
           https://github.com/CanonicalLtd/lightdm/issues/55

           RLIMIT_MEMLOCK = 64 MiB means, arctica-greeter will most likely fail with 64 bit and
           will always fail on 32 bit systems.

           Hence we better disable it. */

        /*Posix.mlockall (Posix.MCL_CURRENT | Posix.MCL_FUTURE);*/

        /* Disable the stupid global menubar */
        Environment.unset_variable ("UBUNTU_MENUPROXY");

        /* Initialize i18n */
        Intl.setlocale (LocaleCategory.ALL, "");
        Intl.bindtextdomain (Config.GETTEXT_PACKAGE, Config.LOCALEDIR);
        Intl.bind_textdomain_codeset (Config.GETTEXT_PACKAGE, "UTF-8");
        Intl.textdomain (Config.GETTEXT_PACKAGE);

        /* Set up the accessibility stack, in case the user needs it for screen reading etc. */
        Environment.set_variable ("GTK_MODULES", "atk-bridge", false);

        /* Fix for https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1024482
           Slick-greeter sets the mouse cursor on the root window.
           Without GDK_CORE_DEVICE_EVENTS set, the DE is unable to apply its own cursor theme and size.
        */
        GLib.Environment.set_variable ("GDK_CORE_DEVICE_EVENTS", "1", true);

        log_timer = new Timer ();
        Log.set_default_handler (log_cb);

        bool do_show_version = false;
        bool do_test_mode = false;
        bool do_test_highcontrast = false;
        bool do_test_bigfont = false;

        OptionEntry versionOption = { "version", 'v', 0, OptionArg.NONE, ref do_show_version,
                /* Help string for command line --version flag */
                N_("Show release version"), null };
        OptionEntry testOption =  { "test-mode", 0, 0, OptionArg.NONE, ref do_test_mode,
                /* Help string for command line --test-mode flag */
                N_("Run in test mode"), null };
        OptionEntry highcontrastOption =  { "test-highcontrast", 0, 0, OptionArg.NONE, ref do_test_highcontrast,
                /* Help string for command line --test-highcontrast flag */
                N_("Run in test mode with a11y highcontrast theme enabled"), null };
        OptionEntry bigfontOption =  { "test-bigfont", 0, 0, OptionArg.NONE, ref do_test_bigfont,
                /* Help string for command line --test-bigfont flag */
                N_("Run in test mode with a11y big font feature enabled"), null };
        OptionEntry nullOption = { null };
        OptionEntry[] options = { versionOption, testOption, highcontrastOption, bigfontOption, nullOption };

        debug ("Loading command line options");
        var c = new OptionContext (/* Arguments and description for --help text */
                                   _("- Arctica Greeter"));
        c.add_main_entries (options, Config.GETTEXT_PACKAGE);
        c.add_group (Gtk.get_option_group (true));
        try
        {
            c.parse (ref args);
        }
        catch (Error e)
        {
            stderr.printf ("%s\n", e.message);
            stderr.printf (/* Text printed out when an unknown command-line argument provided */
                           _("Run '%s --help' to see a full list of available command line options."), args[0]);
            stderr.printf ("\n");
            return Posix.EXIT_FAILURE;
        }

        if (!do_test_mode)
        {
            var hidpi = AGSettings.get_string (AGSettings.KEY_ENABLE_HIDPI);
            debug ("HiDPI support: %s", hidpi);
            if (hidpi == "auto") {
                check_hidpi ();
            }
            else if (hidpi == "on") {
                GLib.Environment.set_variable ("GDK_SCALE", "2", true);
            }
        }

        if (do_show_version)
        {
            /* Note, not translated so can be easily parsed */
            stderr.printf ("arctica-greeter %s\n", Config.VERSION);
            return Posix.EXIT_SUCCESS;
        }

        if (do_test_mode) {
            debug ("Running in test mode");
            if (do_test_highcontrast) {
                debug ("Switching on highcontrast theme for test mode");
            }
            if (do_test_bigfont) {
                debug ("Switching on big font feature for test mode");
            }
        }

        if (!do_test_mode) {
            /* Set the keyboard layout */
            set_keyboard_layout ();

            /* Set the numlock state */
            if (AGSettings.get_boolean (AGSettings.KEY_ACTIVATE_NUMLOCK)) {
                debug ("Activating numlock");
                activate_numlock ();
            }
        }

        Pid atspi_pid = 0;
        if (!do_test_mode)
        {

            try
            {
                string[] argv = null;

                if (FileUtils.test ("/usr/lib/at-spi2-core/at-spi-bus-launcher", FileTest.EXISTS)) {
                    // Debian & derivatives...
                    Shell.parse_argv ("/usr/lib/at-spi2-core/at-spi-bus-launcher --launch-immediately", out argv);
                }
                else if  (FileUtils.test ("/usr/libexec/at-spi-bus-launcher", FileTest.EXISTS)) {
                    // Fedora & derivatives...
                    Shell.parse_argv ("/usr/libexec/at-spi-bus-launcher --launch-immediately", out argv);
                }
                if (argv != null)
                    Process.spawn_async (null,
                                         argv,
                                         null,
                                         SpawnFlags.SEARCH_PATH,
                                         null,
                                         out atspi_pid);
                debug ("Launched at-spi-bus-launcher. PID: %d", atspi_pid);
            }
            catch (Error e)
            {
                warning ("Error starting the at-spi registry: %s", e.message);
            }
        }

        /* Enable touchpad tap-to-click */
        enable_tap_to_click ();

        Gtk.init (ref args);
        Ido.init ();

        debug ("Starting arctica-greeter %s UID=%d LANG=%s", Config.VERSION, (int) Posix.getuid (), Environment.get_variable ("LANG"));

        /* Set the cursor to not be the crap default */
        debug ("Setting cursor");
        Gdk.get_default_root_window ().set_cursor (new Gdk.Cursor.for_display (Gdk.Display.get_default (), Gdk.CursorType.LEFT_PTR));

        /* Set GTK+ settings */
        debug ("Setting GTK+ settings");
        var settings = Gtk.Settings.get_default ();
        var value = AGSettings.get_string (AGSettings.KEY_THEME_NAME);
        if (value != ""){
            debug ("Setting GTK theme: %s", value);
            settings.set ("gtk-theme-name", value, null);
        }
        value = AGSettings.get_string (AGSettings.KEY_ICON_THEME_NAME);
        if (value != ""){
            debug ("Setting icon theme: %s", value);
            settings.set ("gtk-icon-theme-name", value, null);
        }
        value = AGSettings.get_string (AGSettings.KEY_CURSOR_THEME_NAME);
        if (value != "") {
            debug ("Setting cursor theme: %s", value);
            settings.set ("gtk-cursor-theme-name", value, null);
        }
        var int_value = AGSettings.get_integer (AGSettings.KEY_CURSOR_THEME_SIZE);
        if (int_value != 0) {
            debug ("Settings cursor theme size: %d", int_value);
            settings.set ("gtk-cursor-theme-size", int_value, null);
        }
        value = AGSettings.get_string (AGSettings.KEY_FONT_NAME);
        if (value != ""){
            settings.set ("gtk-font-name", value, null);
        }
        var double_value = AGSettings.get_double (AGSettings.KEY_XFT_DPI);
        if (double_value != 0.0)
            settings.set ("gtk-xft-dpi", (int) (1024 * double_value), null);
        var boolean_value = AGSettings.get_boolean (AGSettings.KEY_XFT_ANTIALIAS);
        settings.set ("gtk-xft-antialias", boolean_value, null);
        value = AGSettings.get_string (AGSettings.KEY_XFT_HINTSTYLE);
        if (value != "")
            settings.set ("gtk-xft-hintstyle", value, null);
        value = AGSettings.get_string (AGSettings.KEY_XFT_RGBA);
        if (value != "")
            settings.set ("gtk-xft-rgba", value, null);

        /*
         * Keep a reference to an AGSettings instance for the whole program
         * run, so that the SingleInstance property is working the way we'd
         * like it to work.
         *
         * We want to do this before creating the actual greeter, since the
         * latter is using AGSettings quite extensively.
         *
         * This will throw a Vala warning: "local variable `agsettings' declared
         * but never used". Which can be ignored.
         */
        var agsettings = new AGSettings ();

        debug ("Creating Arctica Greeter");
        var greeter = new ArcticaGreeter (do_test_mode, do_test_highcontrast, do_test_bigfont);
        greeter.go();

        string systemd_stderr;
        int systemd_exitcode = 0;

        Pid marco_pid = 0;
        Pid nmapplet_pid = 0;

        var indicator_list = AGSettings.get_strv(AGSettings.KEY_INDICATORS);

        var update_indicator_list = false;
        for (var i = 0; i < indicator_list.length; i++)
        {
            if (indicator_list[i] == "ug-keyboard")
            {
                indicator_list[i] = "org.ayatana.indicator.keyboard";
                update_indicator_list = true;
            }
        }

        if (update_indicator_list)
            AGSettings.set_strv(AGSettings.KEY_INDICATORS, indicator_list);

        var launched_indicator_services = new List<string>();

        if (!do_test_mode)
        {

            activate_upower();

            try
            {
                string[] argv;

                Shell.parse_argv ("marco", out argv);
                Process.spawn_async (null,
                                     argv,
                                     null,
                                     SpawnFlags.SEARCH_PATH,
                                     null,
                                     out marco_pid);
                debug ("Launched marco WM. PID: %d", marco_pid);
            }
            catch (Error e)
            {
                warning ("Error starting the Marco Window Manager: %s", e.message);
            }

            greeter.greeter_ready.connect (() => {
                debug ("Showing greeter");
                greeter.show ();
            });

            var indicator_service = "";
            foreach (unowned string indicator in indicator_list)
            {
                if ("ug-" in indicator && ! ("." in indicator))
                    continue;

                if ("org.ayatana.indicator." in indicator)
                    indicator_service = "ayatana-indicator-%s".printf(indicator.split_set(".")[3]);
                else if ("ayatana-" in indicator)
                    indicator_service = "ayatana-indicator-%s".printf(indicator.split_set("-")[1]);
                else
                    indicator_service = indicator;

                try {
                    /* Start the indicator service */
                    string[] argv;

                    Shell.parse_argv ("systemctl --user start %s".printf(indicator_service), out argv);
                    Process.spawn_sync (null,
                                        argv,
                                        null,
                                        SpawnFlags.SEARCH_PATH,
                                        null,
                                        null,
                                        out systemd_stderr,
                                        out systemd_exitcode);

                    if (systemd_exitcode == 0)
                    {
                        launched_indicator_services.append(indicator_service);
                        debug ("Successfully started Indicator Service '%s'", indicator_service);
                    }
                    else {
                        warning ("Systemd failed to start Indicator Service '%s': %s", indicator_service, systemd_stderr);
                    }
                }
                catch (Error e) {
                    warning ("Error starting Indicator Service '%s': %s", indicator_service, e.message);
                }
            }

            /* Make nm-applet hide items the user does not have permissions to interact with */
            Environment.set_variable ("NM_APPLET_HIDE_POLICY_ITEMS", "1", true);

            try
            {
                string[] argv;

                Shell.parse_argv ("nm-applet --indicator", out argv);
                Process.spawn_async (null,
                                     argv,
                                     null,
                                     SpawnFlags.SEARCH_PATH,
                                     null,
                                     out nmapplet_pid);
                debug ("Launched nm-applet. PID: %d", nmapplet_pid);
            }
            catch (Error e)
            {
                warning ("Error starting the Network Manager Applet: %s", e.message);
            }

        }
        else
            greeter.show ();

        /* Setup a handler for TERM so we quit cleanly */
        GLib.Unix.signal_add(GLib.ProcessSignal.TERM, () => {
            debug("Got a SIGTERM");
            Gtk.main_quit();
            return true;
        });

        debug ("Starting main loop");
        Gtk.main ();

        debug ("Cleaning up");

        if (!do_test_mode)
        {

            foreach (unowned string indicator_service in launched_indicator_services)
            {

                try {
                    /* Stop this indicator service */
                    string[] argv;

                    Shell.parse_argv ("systemctl --user stop %s".printf(indicator_service), out argv);
                    Process.spawn_sync (null,
                                        argv,
                                        null,
                                        SpawnFlags.SEARCH_PATH,
                                        null,
                                        null,
                                        out systemd_stderr,
                                        out systemd_exitcode);

                    if (systemd_exitcode == 0)
                    {
                        debug ("Successfully stopped Indicator Service '%s' via systemd", indicator_service);
                    }
                    else {
                        warning ("Systemd failed to stop Indicator Service '%s': %s", indicator_service, systemd_stderr);
                    }
                }
                catch (Error e) {
                    warning ("Error stopping Indicator Service '%s': %s", indicator_service, e.message);
                }
            }

            greeter.settings_daemon.stop();

            if (nmapplet_pid != 0)
            {
#if VALA_0_40
                Posix.kill (nmapplet_pid, Posix.Signal.TERM);
#else
                Posix.kill (nmapplet_pid, Posix.SIGTERM);
#endif
                int status;
                Posix.waitpid (nmapplet_pid, out status, 0);
                if (Process.if_exited (status))
                    debug ("Network Manager Applet exited with return value %d", Process.exit_status (status));
                else
                    debug ("Network Manager Applet terminated with signal %d", Process.term_sig (status));
                nmapplet_pid = 0;
            }

            if (atspi_pid != 0)
            {
#if VALA_0_40
                Posix.kill (atspi_pid, Posix.Signal.KILL);
#else
                Posix.kill (atspi_pid, Posix.SIGKILL);
#endif
                int status;
                Posix.waitpid (atspi_pid, out status, 0);
                if (Process.if_exited (status))
                    debug ("AT-SPI exited with return value %d", Process.exit_status (status));
                else
                    debug ("AT-SPI terminated with signal %d", Process.term_sig (status));
                atspi_pid = 0;
            }

            if (marco_pid != 0)
            {
#if VALA_0_40
                Posix.kill (marco_pid, Posix.Signal.TERM);
#else
                Posix.kill (marco_pid, Posix.SIGTERM);
#endif
                int status;
                Posix.waitpid (marco_pid, out status, 0);
                if (Process.if_exited (status))
                    debug ("Marco Window Manager exited with return value %d", Process.exit_status (status));
                else
                    debug ("Marco Window Manager terminated with signal %d", Process.term_sig (status));
                marco_pid = 0;
            }
        }

        var screen = Gdk.Screen.get_default ();
        unowned X.Display xdisplay = (screen.get_display () as Gdk.X11.Display).get_xdisplay ();

        var window = xdisplay.default_root_window();
        var atom = xdisplay.intern_atom ("AT_SPI_BUS", true);

        if (atom != X.None) {
            xdisplay.delete_property (window, atom);
            Gdk.flush();
        }

        debug ("Exiting");

        return Posix.EXIT_SUCCESS;
    }
}

[DBus (name="org.gnome.SessionManager.EndSessionDialog")]
public class DialogDBusInterface : Object
{
    public signal void open_dialog (uint32 type);
    public signal void close_dialog ();

    public void open (uint32 type, uint32 timestamp, uint32 seconds_to_stay_open, ObjectPath[] inhibitor_object_paths)
    {
        open_dialog (type);
    }

    public void close ()
    {
        close_dialog ();
    }
}

[DBus (name="org.mate.SettingsDaemon")]
private interface SettingsDaemonDBusInterface : Object
{
    public signal void plugin_activated (string name);
    public signal void plugin_deactivated (string name);
}