aboutsummaryrefslogtreecommitdiff
path: root/engine/lib/users.php
blob: 3a15e9397efc2923f2714f07f31ffefe6f8affc0 (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
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
<?php
/**
 * Elgg users
 * Functions to manage multiple or single users in an Elgg install
 *
 * @package Elgg
 * @subpackage Core
 */

/// Map a username to a cached GUID
$USERNAME_TO_GUID_MAP_CACHE = array();

/// Map a user code to a cached GUID
$CODE_TO_GUID_MAP_CACHE = array();

/**
 * Return the user specific details of a user by a row.
 *
 * @param int $guid
 */
function get_user_entity_as_row($guid) {
	global $CONFIG;

	$guid = (int)$guid;
	return get_data_row("SELECT * from {$CONFIG->dbprefix}users_entity where guid=$guid");
}

/**
 * Create or update the extras table for a given user.
 * Call create_entity first.
 *
 * @param int $guid
 * @param string $name
 * @param string $description
 * @param string $url
 */
function create_user_entity($guid, $name, $username, $password, $salt, $email, $language, $code) {
	global $CONFIG;

	$guid = (int)$guid;
	$name = sanitise_string($name);
	$username = sanitise_string($username);
	$password = sanitise_string($password);
	$salt = sanitise_string($salt);
	$email = sanitise_string($email);
	$language = sanitise_string($language);
	$code = sanitise_string($code);

	$row = get_entity_as_row($guid);
	if ($row) {
		// Exists and you have access to it

		if ($exists = get_data_row("SELECT guid from {$CONFIG->dbprefix}users_entity where guid = {$guid}")) {
			$result = update_data("UPDATE {$CONFIG->dbprefix}users_entity set name='$name', username='$username', password='$password', salt='$salt', email='$email', language='$language', code='$code', last_action = ". time() ." where guid = {$guid}");
			if ($result != false) {
				// Update succeeded, continue
				$entity = get_entity($guid);
				if (trigger_elgg_event('update',$entity->type,$entity)) {
					return $guid;
				} else {
					$entity->delete();
				}
			}
		} else {
			// Update failed, attempt an insert.
			$result = insert_data("INSERT into {$CONFIG->dbprefix}users_entity (guid, name, username, password, salt, email, language, code) values ($guid, '$name', '$username', '$password', '$salt', '$email', '$language', '$code')");
			if ($result!==false) {
				$entity = get_entity($guid);
				if (trigger_elgg_event('create',$entity->type,$entity)) {
					return $guid;
				} else {
					$entity->delete(); //delete_entity($guid);
				}
			}
		}
	}

	return false;
}

/**
 * Disables all of a user's entities
 *
 * @param int $owner_guid The owner GUID
 * @return true|false Depending on success
 */
function disable_user_entities($owner_guid) {
	global $CONFIG;
	$owner_guid = (int) $owner_guid;
	if ($entity = get_entity($owner_guid)) {
		if (trigger_elgg_event('disable',$entity->type,$entity)) {
			if ($entity->canEdit()) {
				$res = update_data("UPDATE {$CONFIG->dbprefix}entities set enabled='no' where owner_guid={$owner_guid} or container_guid = {$owner_guid}");
				return $res;
			}
		}
	}

	return false;
}

/**
 * Ban a user
 *
 * @param int $user_guid The user guid
 * @param string $reason A reason
 */
function ban_user($user_guid, $reason = "") {
	global $CONFIG;

	$user_guid = (int)$user_guid;
	$reason = sanitise_string($reason);

	$user = get_entity($user_guid);

	if (($user) && ($user->canEdit()) && ($user instanceof ElggUser)) {
		if (trigger_elgg_event('ban', 'user', $user)) {
			// Add reason
			if ($reason) {
				create_metadata($user_guid, 'ban_reason', $reason,'', 0, ACCESS_PUBLIC);
			}

			// clear "remember me" cookie code so user cannot login in using it
			$user->code = "";
			$user->save();

			// invalidate memcache for this user
			static $newentity_cache;
			if ((!$newentity_cache) && (is_memcache_available())) {
				$newentity_cache = new ElggMemcache('new_entity_cache');
			}

			if ($newentity_cache) {
				$newentity_cache->delete($user_guid);
			}

			// Set ban flag
			return update_data("UPDATE {$CONFIG->dbprefix}users_entity set banned='yes' where guid=$user_guid");
		}

		return FALSE;
	}

	return FALSE;
}

/**
 * Unban a user.
 *
 * @param int $user_guid Unban a user.
 */
function unban_user($user_guid) {
	global $CONFIG;

	$user_guid = (int)$user_guid;

	$user = get_entity($user_guid);

	if (($user) && ($user->canEdit()) && ($user instanceof ElggUser)) {
		if (trigger_elgg_event('unban', 'user', $user)) {
			create_metadata($user_guid, 'ban_reason', '','', 0, ACCESS_PUBLIC);

			// invalidate memcache for this user
			static $newentity_cache;
			if ((!$newentity_cache) && (is_memcache_available())) {
				$newentity_cache = new ElggMemcache('new_entity_cache');
			}

			if ($newentity_cache) {
				$newentity_cache->delete($user_guid);
			}

			return update_data("UPDATE {$CONFIG->dbprefix}users_entity set banned='no' where guid=$user_guid");
		}

		return FALSE;
	}

	return FALSE;
}

/**
 * Makes user $guid an admin.
 *
 * @param int $guid
 * @return bool
 */
function make_user_admin($user_guid) {
	global $CONFIG;

	$user = get_entity((int)$user_guid);

	if (($user) && ($user instanceof ElggUser) && ($user->canEdit())) {
		if (trigger_elgg_event('make_admin', 'user', $user)) {

			// invalidate memcache for this user
			static $newentity_cache;
			if ((!$newentity_cache) && (is_memcache_available())) {
				$newentity_cache = new ElggMemcache('new_entity_cache');
			}

			if ($newentity_cache) {
				$newentity_cache->delete($user_guid);
			}

			$r = update_data("UPDATE {$CONFIG->dbprefix}users_entity set admin='yes' where guid=$user_guid");
			invalidate_cache_for_entity($user_guid);
			return $r;
		}

		return FALSE;
	}

	return FALSE;
}

/**
 * Removes user $guid's admin flag.
 *
 * @param int $guid
 * @return bool
 */
function remove_user_admin($user_guid) {
	global $CONFIG;

	$user = get_entity((int)$user_guid);

	if (($user) && ($user instanceof ElggUser) && ($user->canEdit())) {
		if (trigger_elgg_event('remove_admin', 'user', $user)) {

			// invalidate memcache for this user
			static $newentity_cache;
			if ((!$newentity_cache) && (is_memcache_available())) {
				$newentity_cache = new ElggMemcache('new_entity_cache');
			}

			if ($newentity_cache) {
				$newentity_cache->delete($user_guid);
			}

			$r = update_data("UPDATE {$CONFIG->dbprefix}users_entity set admin='no' where guid=$user_guid");
			invalidate_cache_for_entity($user_guid);
			return $r;
		}

		return FALSE;
	}

	return FALSE;
}

/**
 * THIS FUNCTION IS DEPRECATED.
 *
 * Delete a user's extra data.
 * @todo remove
 * @param int $guid
 */
function delete_user_entity($guid) {
	system_message(sprintf(elgg_echo('deprecatedfunction'), 'delete_user_entity'));

	return 1; // Always return that we have deleted one row in order to not break existing code.
}

/**
 * Get the sites this user is part of
 *
 * @param int $user_guid The user's GUID
 * @param int $limit Number of results to return
 * @param int $offset Any indexing offset
 * @return false|array On success, an array of ElggSites
 */
function get_user_sites($user_guid, $limit = 10, $offset = 0) {
	$user_guid = (int)$user_guid;
	$limit = (int)$limit;
	$offset = (int)$offset;

	return elgg_get_entities_from_relationship(array(
		'relationship' => 'member_of_site',
		'relationship_guid' => $user_guid,
		'inverse_relationship' => FALSE,
		'types' => 'site',
		'limit' => $limit,
		'offset' => $offset)
	);
}

/**
 * Adds a user to another user's friends list.
 *
 * @param int $user_guid The GUID of the friending user
 * @param int $friend_guid The GUID of the user to friend
 * @return true|false Depending on success
 */
function user_add_friend($user_guid, $friend_guid) {
	$user_guid = (int) $user_guid;
	$friend_guid = (int) $friend_guid;
	if ($user_guid == $friend_guid) {
		return false;
	}
	if (!$friend = get_entity($friend_guid)) {
		return false;
	}
	if (!$user = get_entity($user_guid)) {
		return false;
	}
	if ((!($user instanceof ElggUser)) || (!($friend instanceof ElggUser))) {
		return false;
	}
	return add_entity_relationship($user_guid, "friend", $friend_guid);
}

/**
 * Removes a user from another user's friends list.
 *
 * @param int $user_guid The GUID of the friending user
 * @param int $friend_guid The GUID of the user on the friends list
 * @return true|false Depending on success
 */
function user_remove_friend($user_guid, $friend_guid) {
	global $CONFIG;

	$user_guid = (int) $user_guid;
	$friend_guid = (int) $friend_guid;

	// perform cleanup for access lists.
	$collections = get_user_access_collections($user_guid);
	if ($collections) {
		foreach ($collections as $collection) {
			remove_user_from_access_collection($friend_guid, $collection->id);
		}
	}

	return remove_entity_relationship($user_guid, "friend", $friend_guid);
}

/**
 * Determines whether or not a user is another user's friend.
 *
 * @param int $user_guid The GUID of the user
 * @param int $friend_guid The GUID of the friend
 * @return true|false
 */
function user_is_friend($user_guid, $friend_guid) {
	return check_entity_relationship($user_guid, "friend", $friend_guid);
}

/**
 * Obtains a given user's friends
 *
 * @param int $user_guid The user's GUID
 * @param string $subtype The subtype of users, if any
 * @param int $limit Number of results to return (default 10)
 * @param int $offset Indexing offset, if any
 * @return false|array Either an array of ElggUsers or false, depending on success
 */
function get_user_friends($user_guid, $subtype = ELGG_ENTITIES_ANY_VALUE, $limit = 10, $offset = 0) {
	return elgg_get_entities_from_relationship(array(
		'relationship' => 'friend',
		'relationship_guid' => $user_guid,
		'types' => 'user',
		'subtypes' => $subtype,
		'limit' => $limit,
		'offset' => $offset
	));
}

/**
 * Obtains the people who have made a given user a friend
 *
 * @param int $user_guid The user's GUID
 * @param string $subtype The subtype of users, if any
 * @param int $limit Number of results to return (default 10)
 * @param int $offset Indexing offset, if any
 * @return false|array Either an array of ElggUsers or false, depending on success
 */
function get_user_friends_of($user_guid, $subtype = ELGG_ENTITIES_ANY_VALUE, $limit = 10, $offset = 0) {
	return elgg_get_entities_from_relationship(array(
		'relationship' => 'friend',
		'relationship_guid' => $user_guid,
		'inverse_relationship' => TRUE,
		'types' => 'user',
		'subtypes' => $subtype,
		'limit' => $limit,
		'offset' => $offset
	));
}

/**
 * Obtains a list of objects owned by a user
 *
 * @param int $user_guid The GUID of the owning user
 * @param string $subtype Optionally, the subtype of objects
 * @param int $limit The number of results to return (default 10)
 * @param int $offset Indexing offset, if any
 * @param int $timelower The earliest time the entity can have been created. Default: all
 * @param int $timeupper The latest time the entity can have been created. Default: all
 * @return false|array An array of ElggObjects or false, depending on success
 */
function get_user_objects($user_guid, $subtype = ELGG_ENTITIES_ANY_VALUE, $limit = 10, $offset = 0, $timelower = 0, $timeupper = 0) {
	$ntt = elgg_get_entities(array(
		'type' => 'object',
		'subtype' => $subtype,
		'owner_guid' => $user_guid,
		'limit' => $limit,
		'offset' => $offset,
		'container_guid' => $user_guid,
		'created_time_lower' => $timelower,
		'created_time_upper' => $timeupper
	));
	return $ntt;
}

/**
 * Counts the objects (optionally of a particular subtype) owned by a user
 *
 * @param int $user_guid The GUID of the owning user
 * @param string $subtype Optionally, the subtype of objects
 * @param int $timelower The earliest time the entity can have been created. Default: all
 * @param int $timeupper The latest time the entity can have been created. Default: all
 * @return int The number of objects the user owns (of this subtype)
 */
function count_user_objects($user_guid, $subtype = ELGG_ENTITIES_ANY_VALUE, $timelower = 0, $timeupper = 0) {
	$total = elgg_get_entities(array(
		'type' => 'object',
		'subtype' => $subtype,
		'owner_guid' => $user_guid,
		'count' => TRUE,
		'container_guid' => $user_guid,
		'created_time_lower' => $timelower,
		'created_time_upper' => $timeupper
	));
	return $total;
}

/**
 * Displays a list of user objects of a particular subtype, with navigation.
 *
 * @see elgg_view_entity_list
 *
 * @param int $user_guid The GUID of the user
 * @param string $subtype The object subtype
 * @param int $limit The number of entities to display on a page
 * @param true|false $fullview Whether or not to display the full view (default: true)
 * @param true|false $viewtypetoggle Whether or not to allow gallery view (default: true)
 * @param true|false $pagination Whether to display pagination (default: true)
 * @param int $timelower The earliest time the entity can have been created. Default: all
 * @param int $timeupper The latest time the entity can have been created. Default: all
 * @return string The list in a form suitable to display
 */
function list_user_objects($user_guid, $subtype = ELGG_ENTITIES_ANY_VALUE, $limit = 10, $fullview = true, $viewtypetoggle = true, $pagination = true, $timelower = 0, $timeupper = 0) {
	$offset = (int) get_input('offset');
	$limit = (int) $limit;
	$count = (int) count_user_objects($user_guid, $subtype,$timelower,$timeupper);
	$entities = get_user_objects($user_guid, $subtype, $limit, $offset, $timelower, $timeupper);

	return elgg_view_entity_list($entities, $count, $offset, $limit, $fullview, $viewtypetoggle, $pagination);
}

/**
 * Obtains a list of objects owned by a user's friends
 *
 * @param int $user_guid The GUID of the user to get the friends of
 * @param string $subtype Optionally, the subtype of objects
 * @param int $limit The number of results to return (default 10)
 * @param int $offset Indexing offset, if any
 * @param int $timelower The earliest time the entity can have been created. Default: all
 * @param int $timeupper The latest time the entity can have been created. Default: all
 * @return false|array An array of ElggObjects or false, depending on success
 */
function get_user_friends_objects($user_guid, $subtype = ELGG_ENTITIES_ANY_VALUE, $limit = 10, $offset = 0, $timelower = 0, $timeupper = 0) {
	if ($friends = get_user_friends($user_guid, "", 999999, 0)) {
		$friendguids = array();
		foreach($friends as $friend) {
			$friendguids[] = $friend->getGUID();
		}
		return elgg_get_entities(array(
			'type' => 'object',
			'subtype' => $subtype,
			'owner_guids' => $friendguids,
			'limit' => $limit,
			'offset' => $offset,
			'container_guids' => $friendguids,
			'created_time_lower' => $timelower,
			'created_time_upper' => $timeupper
		));
	}
	return FALSE;
}

/**
 * Counts the number of objects owned by a user's friends
 *
 * @param int $user_guid The GUID of the user to get the friends of
 * @param string $subtype Optionally, the subtype of objects
 * @param int $timelower The earliest time the entity can have been created. Default: all
 * @param int $timeupper The latest time the entity can have been created. Default: all
 * @return int The number of objects
 */
function count_user_friends_objects($user_guid, $subtype = ELGG_ENTITIES_ANY_VALUE, $timelower = 0, $timeupper = 0) {
	if ($friends = get_user_friends($user_guid, "", 999999, 0)) {
		$friendguids = array();
		foreach($friends as $friend) {
			$friendguids[] = $friend->getGUID();
		}
		return elgg_get_entities(array(
			'type' => 'object',
			'subtype' => $subtype,
			'owner_guids' => $friendguids,
			'count' => TRUE,
			'container_guids' => $friendguids,
			'created_time_lower' => $timelower,
			'created_time_upper' => $timeupper
		));
	}
	return 0;
}

/**
 * Displays a list of a user's friends' objects of a particular subtype, with navigation.
 *
 * @see elgg_view_entity_list
 *
 * @param int $user_guid The GUID of the user
 * @param string $subtype The object subtype
 * @param int $limit The number of entities to display on a page
 * @param true|false $fullview Whether or not to display the full view (default: true)
 * @param true|false $viewtypetoggle Whether or not to allow you to flip to gallery mode (default: true)
 * @param true|false $pagination Whether to display pagination (default: true)
 * @param int $timelower The earliest time the entity can have been created. Default: all
 * @param int $timeupper The latest time the entity can have been created. Default: all
 * @return string The list in a form suitable to display
 */
function list_user_friends_objects($user_guid, $subtype = "", $limit = 10, $fullview = true, $viewtypetoggle = true, $pagination = true, $timelower = 0, $timeupper = 0) {
	$offset = (int) get_input('offset');
	$limit = (int) $limit;
	$count = (int) count_user_friends_objects($user_guid, $subtype, $timelower, $timeupper);
	$entities = get_user_friends_objects($user_guid, $subtype, $limit, $offset, $timelower, $timeupper);

	return elgg_view_entity_list($entities, $count, $offset, $limit, $fullview, $viewtypetoggle, $pagination);
}

/**
 * Get user objects by an array of metadata
 *
 * @param int $user_guid The GUID of the owning user
 * @param string $subtype Optionally, the subtype of objects
 * @paran array $metadata An array of metadata
 * @param int $limit The number of results to return (default 10)
 * @param int $offset Indexing offset, if any
 * @return false|array An array of ElggObjects or false, depending on success
 */
function get_user_objects_by_metadata($user_guid, $subtype = "", $metadata = array(), $limit = 0, $offset = 0) {
	return get_entities_from_metadata_multi($metadata,"object",$subtype,$user_guid,$limit,$offset);
}

/**
 * Get a user object from a GUID.
 *
 * This function returns an ElggUser from a given GUID.
 * @param int $guid The GUID
 * @return ElggUser|false
 */
function get_user($guid) {
	// Fixes "Exception thrown without stack frame" when db_select fails
	if (!empty($guid)) {
		$result = get_entity($guid);
	}

	if ((!empty($result)) && (!($result instanceof ElggUser))) {
		//throw new InvalidClassException(sprintf(elgg_echo('InvalidClassException:NotValidElggStar'), $guid, 'ElggUser'));
		return false;
	}

	if (!empty($result)) {
		return $result;
	}

	return false;
}

/**
 * Get user by username
 *
 * @param string $username The user's username
 * @return ElggUser|false Depending on success
 */
function get_user_by_username($username) {
	global $CONFIG, $USERNAME_TO_GUID_MAP_CACHE;

	$username = sanitise_string($username);
	$access = get_access_sql_suffix('e');

	// Caching
	if ( (isset($USERNAME_TO_GUID_MAP_CACHE[$username])) && (retrieve_cached_entity($USERNAME_TO_GUID_MAP_CACHE[$username])) ) {
		return retrieve_cached_entity($USERNAME_TO_GUID_MAP_CACHE[$username]);
	}

	$row = get_data_row("SELECT e.* from {$CONFIG->dbprefix}users_entity u join {$CONFIG->dbprefix}entities e on e.guid=u.guid where u.username='$username' and $access ");
	if ($row) {
		$USERNAME_TO_GUID_MAP_CACHE[$username] = $row->guid;
		return new ElggUser($row);
	}

	return false;
}

/**
 * Get user by session code
 *
 * @param string $code The session code
 * @return ElggUser|false Depending on success
 */
function get_user_by_code($code) {
	global $CONFIG, $CODE_TO_GUID_MAP_CACHE;

	$code = sanitise_string($code);

	$access = get_access_sql_suffix('e');

	// Caching
	if ( (isset($CODE_TO_GUID_MAP_CACHE[$code])) && (retrieve_cached_entity($CODE_TO_GUID_MAP_CACHE[$code])) ) {
		return retrieve_cached_entity($CODE_TO_GUID_MAP_CACHE[$code]);
	}

	$row = get_data_row("SELECT e.* from {$CONFIG->dbprefix}users_entity u join {$CONFIG->dbprefix}entities e on e.guid=u.guid where u.code='$code' and $access");
	if ($row) {
		$CODE_TO_GUID_MAP_CACHE[$code] = $row->guid;
		return new ElggUser($row);
	}

	return false;
}

/**
 * Get an array of users from their
 *
 * @param string $email Email address.
 * @return Array of users
 */
function get_user_by_email($email) {
	global $CONFIG;

	$email = sanitise_string($email);

	$access = get_access_sql_suffix('e');

	$query = "SELECT e.* from {$CONFIG->dbprefix}entities e join {$CONFIG->dbprefix}users_entity u on e.guid=u.guid where email='$email' and $access";

	return get_data($query, 'entity_row_to_elggstar');
}

/**
 * Searches for a user based on a complete or partial name or username.
 *
 * @param string $criteria The partial or full name or username.
 * @param int $limit Limit of the search.
 * @param int $offset Offset.
 * @param string $order_by The order.
 * @param boolean $count Whether to return the count of results or just the results.
 * @deprecated 1.7
 */
function search_for_user($criteria, $limit = 10, $offset = 0, $order_by = "", $count = false) {
	elgg_deprecated_notice('search_for_user() was deprecated by new search.', 1.7);
	global $CONFIG;

	$criteria = sanitise_string($criteria);
	$limit = (int)$limit;
	$offset = (int)$offset;
	$order_by = sanitise_string($order_by);

	$access = get_access_sql_suffix("e");

	if ($order_by == "") {
		$order_by = "e.time_created desc";
	}

	if ($count) {
		$query = "SELECT count(e.guid) as total ";
	} else {
		$query = "SELECT e.* ";
	}
	$query .= "from {$CONFIG->dbprefix}entities e join {$CONFIG->dbprefix}users_entity u on e.guid=u.guid where ";
	// $query .= " match(u.name,u.username) against ('$criteria') ";
	$query .= "(u.name like \"%{$criteria}%\" or u.username like \"%{$criteria}%\")";
	$query .= " and $access";

	if (!$count) {
		$query .= " order by $order_by limit $offset, $limit"; // Add order and limit
		return get_data($query, "entity_row_to_elggstar");
	} else {
		if ($count = get_data_row($query)) {
			return $count->total;
		}
	}
	return false;
}

/**
 * Displays a list of user objects that have been searched for.
 *
 * @see elgg_view_entity_list
 *
 * @param string $tag Search criteria
 * @param int $limit The number of entities to display on a page
 * @return string The list in a form suitable to display
 * @deprecated 1.7
 */
function list_user_search($tag, $limit = 10) {
	elgg_deprecated_notice('list_user_search() deprecated by new search', 1.7);
	$offset = (int) get_input('offset');
	$limit = (int) $limit;
	$count = (int) search_for_user($tag, 10, 0, '', true);
	$entities = search_for_user($tag, $limit, $offset);

	return elgg_view_entity_list($entities, $count, $offset, $limit, $fullview, false);
}

/**
 * A function that returns a maximum of $limit users who have done something within the last
 * $seconds seconds.
 *
 * @param int $seconds Number of seconds (default 600 = 10min)
 * @param int $limit Limit, default 10.
 * @param int $offset Offset, defualt 0.
 */
function find_active_users($seconds = 600, $limit = 10, $offset = 0) {
	global $CONFIG;

	$seconds = (int)$seconds;
	$limit = (int)$limit;
	$offset = (int)$offset;

	$time = time() - $seconds;

	$access = get_access_sql_suffix("e");

	$query = "SELECT distinct e.* from {$CONFIG->dbprefix}entities e join {$CONFIG->dbprefix}users_entity u on e.guid = u.guid where u.last_action >= {$time} and $access order by u.last_action desc limit {$offset},{$limit}";

	return get_data($query, "entity_row_to_elggstar");
}

/**
 * Generate and send a password request email to a given user's registered email address.
 *
 * @param int $user_guid
 */
function send_new_password_request($user_guid) {
	global $CONFIG;

	$user_guid = (int)$user_guid;

	$user = get_entity($user_guid);
	if ($user) {
		// generate code
		$code = generate_random_cleartext_password();
		//create_metadata($user_guid, 'conf_code', $code,'', 0, ACCESS_PRIVATE);
		set_private_setting($user_guid, 'passwd_conf_code', $code);

		// generate link
		$link = $CONFIG->site->url . "pg/resetpassword?u=$user_guid&c=$code";

		// generate email
		$email = sprintf(elgg_echo('email:resetreq:body'), $user->name, $_SERVER['REMOTE_ADDR'], $link);

		return notify_user($user->guid, $CONFIG->site->guid, elgg_echo('email:resetreq:subject'), $email, NULL, 'email');
	}

	return false;
}

/**
 * Low level function to reset a given user's password.
 *
 * This can only be called from execute_new_password_request().
 *
 * @param int $user_guid The user.
 * @param string $password password text (which will then be converted into a hash and stored)
 */
function force_user_password_reset($user_guid, $password) {
	global $CONFIG;

	if (call_gatekeeper('execute_new_password_request', __FILE__)) {
		$user = get_entity($user_guid);

		if ($user) {
			$salt = generate_random_cleartext_password(); // Reset the salt
			$user->salt = $salt;

			$hash = generate_user_password($user, $password);

			return update_data("UPDATE {$CONFIG->dbprefix}users_entity set password='$hash', salt='$salt' where guid=$user_guid");
		}
	}

	return false;
}

/**
 * Validate and execute a password reset for a user.
 *
 * @param int $user_guid The user id
 * @param string $conf_code Confirmation code as sent in the request email.
 */
function execute_new_password_request($user_guid, $conf_code) {
	global $CONFIG;

	$user_guid = (int)$user_guid;
	$user = get_entity($user_guid);

	$saved_code = get_private_setting($user_guid, 'passwd_conf_code');

	if ($user && $saved_code && $saved_code == $conf_code) {
		$password = generate_random_cleartext_password();

		if (force_user_password_reset($user_guid, $password)) {
			remove_private_setting($user_guid, 'passwd_conf_code');

			$email = sprintf(elgg_echo('email:resetpassword:body'), $user->name, $password);

			return notify_user($user->guid, $CONFIG->site->guid, elgg_echo('email:resetpassword:subject'), $email, NULL, 'email');
		}
	}

	return FALSE;
}

/**
 * Handles pages for password reset requests.
 *
 * @param unknown_type $page
 * @return unknown_type
 */
function elgg_user_resetpassword_page_handler($page) {
	global $CONFIG;

	$user_guid = get_input('u');
	$code = get_input('c');

	$user = get_entity($user_guid);

	// don't check code here to avoid automated attacks
	if (!$user instanceof ElggUser) {
		register_error(elgg_echo('user:passwordreset:unknown_user'));
		forward();
	}

	$form_body = elgg_echo('user:resetpassword:reset_password_confirm') . "<br />";

	$form_body .= elgg_view('input/hidden', array(
		'internalname' => 'u',
		'value' => $user_guid
	));

	$form_body .= elgg_view('input/hidden', array(
		'internalname' => 'c',
		'value' => $code
	));

	$form_body .= elgg_view('input/submit', array(
		'value' => elgg_echo('resetpassword')
	));

	$form .= elgg_view('input/form', array(
		'body' => $form_body,
		'action' => $CONFIG->site->url . 'action/user/passwordreset'
	));

	$title = elgg_echo('resetpassword');
	$content = elgg_view_title(elgg_echo('resetpassword')) . $form;

	page_draw($title, elgg_view_layout('one_column', $content));
}

/**
 * Simple function that will generate a random clear text password suitable for feeding into generate_user_password().
 *
 * @see generate_user_password
 * @return string
 */
function generate_random_cleartext_password() {
	return substr(md5(microtime() . rand()), 0, 8);
}

/**
 * Generate a password for a user, currently uses MD5.
 *
 * Later may introduce salting etc.
 *
 * @param ElggUser $user The user this is being generated for.
 * @param string $password Password in clear text
 */
function generate_user_password(ElggUser $user, $password) {
	return md5($password . $user->salt);
}

/**
 * Simple function which ensures that a username contains only valid characters.
 *
 * This should only permit chars that are valid on the file system as well.
 *
 * @param string $username
 * @throws RegistrationException on invalid
 */
function validate_username($username) {
	global $CONFIG;

	// Basic, check length
	if (!isset($CONFIG->minusername)) {
		$CONFIG->minusername = 4;
	}

	if (strlen($username) < $CONFIG->minusername) {
		throw new RegistrationException(elgg_echo('registration:usernametooshort'));
	}

	// Blacklist for bad characters (partially nicked from mediawiki)

	$blacklist = '/[' .
		'\x{0080}-\x{009f}' . # iso-8859-1 control chars
		'\x{00a0}' .          # non-breaking space
		'\x{2000}-\x{200f}' . # various whitespace
		'\x{2028}-\x{202f}' . # breaks and control chars
		'\x{3000}' .          # ideographic space
		'\x{e000}-\x{f8ff}' . # private use
		']/u';

	if (
		preg_match($blacklist, $username)
	) {
		throw new RegistrationException(elgg_echo('registration:invalidchars'));
	}

	// Belts and braces
	// @todo Tidy into main unicode
	$blacklist2 = '\'/\\"*& ?#%^(){}[]~?<>;|¬`@-+=';
	for ($n=0; $n < strlen($blacklist2); $n++) {
		if (strpos($username, $blacklist2[$n])!==false) {
			throw new RegistrationException(sprintf(elgg_echo('registration:invalidchars'), $blacklist2[$n], $blacklist2));
		}
	}

	$result = true;
	return trigger_plugin_hook('registeruser:validate:username', 'all', array('username' => $username), $result);
}

/**
 * Simple validation of a password.
 *
 * @param string $password
 * @throws RegistrationException on invalid
 */
function validate_password($password) {
	global $CONFIG;

	if (strlen($password) < $CONFIG->min_password_length) {
		throw new RegistrationException(elgg_echo('registration:passwordtooshort'));
	}

	$result = true;
	return trigger_plugin_hook('registeruser:validate:password', 'all', array('password' => $password), $result);
}

/**
 * Simple validation of a email.
 *
 * @param string $address
 * @throws RegistrationException on invalid
 * @return bool
 */
function validate_email_address($address) {
	if (!is_email_address($address)) {
		throw new RegistrationException(elgg_echo('registration:notemail'));
	}

	// Got here, so lets try a hook (defaulting to ok)
	$result = true;
	return trigger_plugin_hook('registeruser:validate:email', 'all', array('email' => $address), $result);
}

/**
 * Registers a user, returning false if the username already exists
 *
 * @param string $username The username of the new user
 * @param string $password The password
 * @param string $name The user's display name
 * @param string $email Their email address
 * @param bool $allow_multiple_emails Allow the same email address to be registered multiple times?
 * @param int $friend_guid Optionally, GUID of a user this user will friend once fully registered
 * @return int|false The new user's GUID; false on failure
 */
function register_user($username, $password, $name, $email, $allow_multiple_emails = false, $friend_guid = 0, $invitecode = '') {
	// Load the configuration
	global $CONFIG;

	// no need to trim password.
	$username = trim($username);
	$name = trim(strip_tags($name));
	$email = trim($email);

	// A little sanity checking
	if (empty($username)
	|| empty($password)
	|| empty($name)
	|| empty($email)) {
		return false;
	}

	// Make sure a user with conflicting details hasn't registered and been disabled
	$access_status = access_get_show_hidden_status();
	access_show_hidden_entities(true);

	if (!validate_email_address($email)) {
		throw new RegistrationException(elgg_echo('registration:emailnotvalid'));
	}

	if (!validate_password($password)) {
		throw new RegistrationException(elgg_echo('registration:passwordnotvalid'));
	}

	if (!validate_username($username)) {
		throw new RegistrationException(elgg_echo('registration:usernamenotvalid'));
	}

	if ($user = get_user_by_username($username)) {
		throw new RegistrationException(elgg_echo('registration:userexists'));
	}

	if ((!$allow_multiple_emails) && (get_user_by_email($email))) {
		throw new RegistrationException(elgg_echo('registration:dupeemail'));
	}

	access_show_hidden_entities($access_status);

	// Create user
	$user = new ElggUser();
	$user->username = $username;
	$user->email = $email;
	$user->name = $name;
	$user->access_id = ACCESS_PUBLIC;
	$user->salt = generate_random_cleartext_password(); // Note salt generated before password!
	$user->password = generate_user_password($user, $password);
	$user->owner_guid = 0; // Users aren't owned by anyone, even if they are admin created.
	$user->container_guid = 0; // Users aren't contained by anyone, even if they are admin created.
	$user->save();

	// If $friend_guid has been set, make mutual friends
	if ($friend_guid) {
		if ($friend_user = get_user($friend_guid)) {
			if ($invitecode == generate_invite_code($friend_user->username)) {
				$user->addFriend($friend_guid);
				$friend_user->addFriend($user->guid);

				// @todo Should this be in addFriend?
				add_to_river('friends/river/create', 'friend', $user->getGUID(), $friend_guid);
				add_to_river('friends/river/create', 'friend', $friend_guid, $user->getGUID());
			}
		}
	}

	// Check to see if we've registered the first admin yet.
	// If not, this is the first admin user!
	$have_admin = datalist_get('admin_registered');

	if (!$have_admin) {
		// makeAdmin() calls ElggUser::canEdit().
		// right now no one is logged in and so canEdit() returns false.
		// instead of making an override for this one instance that is called on every
		// canEdit() call, just override the access system to set the first admin user.
		// @todo remove this when Cash merges in the new installer
		$ia = elgg_set_ignore_access(TRUE);
		$user->makeAdmin();
		datalist_set('admin_registered', 1);
		elgg_set_ignore_access($ia);
	}

	// Turn on email notifications by default
	set_user_notification_setting($user->getGUID(), 'email', true);

	return $user->getGUID();
}

/**
 * Generates a unique invite code for a user
 *
 * @param string $username The username of the user sending the invitation
 * @return string Invite code
 */
function generate_invite_code($username) {
	$secret = datalist_get('__site_secret__');
	return md5($username . $secret);
}

/**
 * Adds collection submenu items
 *
 */
function collections_submenu_items() {
	global $CONFIG;
	$user = get_loggedin_user();
	add_submenu_item(elgg_echo('friends:collections'), $CONFIG->wwwroot . "pg/collections/" . $user->username);
	add_submenu_item(elgg_echo('friends:collections:add'), $CONFIG->wwwroot . "pg/collections/add");
}

/**
 * Page handler for friends
 *
 */
function friends_page_handler($page_elements) {
	if (isset($page_elements[0]) && $user = get_user_by_username($page_elements[0])) {
		set_page_owner($user->getGUID());
	}
	if (get_loggedin_userid() == page_owner()) {
		// collections_submenu_items(); disabled for now as we no longer use friends collections (replaced by shared access)
	}
	require_once(dirname(dirname(dirname(__FILE__))) . "/pages/friends/index.php");
}

/**
 * Page handler for friends of
 *
 */
function friends_of_page_handler($page_elements) {
	if (isset($page_elements[0]) && $user = get_user_by_username($page_elements[0])) {
		set_page_owner($user->getGUID());
	}
	if (get_loggedin_userid() == page_owner()) {
		// collections_submenu_items(); disabled for now as we no longer use friends collections (replaced by shared access)
	}
	require_once(dirname(dirname(dirname(__FILE__))) . "/pages/friends/of.php");
}

/**
 * Page handler for friends collections
 *
 */
function collections_page_handler($page_elements) {
	if (isset($page_elements[0])) {
		if ($page_elements[0] == "add") {
			set_page_owner(get_loggedin_userid());
			collections_submenu_items();
			require_once(dirname(dirname(dirname(__FILE__))) . "/pages/friends/add.php");
		} else {
			if ($user = get_user_by_username($page_elements[0])) {
				set_page_owner($user->getGUID());
				if (get_loggedin_userid() == page_owner()) {
					collections_submenu_items();
				}
				require_once(dirname(dirname(dirname(__FILE__))) . "/pages/friends/collections.php");
			}
		}
	}
}

/**
 * Page handler for dashboard
 */
function dashboard_page_handler($page_elements) {
	require_once(dirname(dirname(dirname(__FILE__))) . "/pages/dashboard/index.php");
}


/**
 * Page handler for registration
 */
function registration_page_handler($page_elements) {
	require_once(dirname(dirname(dirname(__FILE__))) . "/pages/account/register.php");
}

/**
 * Display a login box.
 *
 * This is a fallback for non-JS users who click on the
 * dropdown login link.
 */
function elgg_user_login_page_handler() {
	$content = elgg_view_layout('one_column', elgg_view('account/forms/login'));
	$content = '
	<div id="elgg_content" class="clearfloat">
	' .	elgg_view('account/forms/login') . '
	</div>
	';
	page_draw('test', $content);
}

/**
 * Sets the last action time of the given user to right now.
 *
 * @param int $user_guid The user GUID
 */
function set_last_action($user_guid) {
	$user_guid = (int) $user_guid;
	global $CONFIG;
	$time = time();

	execute_delayed_write_query("UPDATE {$CONFIG->dbprefix}users_entity set prev_last_action = last_action, last_action = {$time} where guid = {$user_guid}");
}

/**
 * Sets the last logon time of the given user to right now.
 *
 * @param int $user_guid The user GUID
 */
function set_last_login($user_guid) {
	$user_guid = (int) $user_guid;
	global $CONFIG;
	$time = time();

	execute_delayed_write_query("UPDATE {$CONFIG->dbprefix}users_entity set prev_last_login = last_login, last_login = {$time} where guid = {$user_guid}");
}

/**
 * Creates a relationship between this site and the user.
 *
 * @param $event
 * @param $object_type
 * @param $object
 * @return bool
 */
function user_create_hook_add_site_relationship($event, $object_type, $object) {
	global $CONFIG;

	add_entity_relationship($object->getGUID(), 'member_of_site', $CONFIG->site->getGUID());
}

/**
 * Sets up user-related menu items
 *
 */
function users_pagesetup() {
	// Load config
	global $CONFIG;

	//add submenu options
	if (get_context() == "friends" || get_context() == "friendsof") {  // || get_context() == "collections") { - disabled as we no longer use collections
		add_submenu_item(elgg_echo('friends'),$CONFIG->wwwroot."pg/friends/" . page_owner_entity()->username);
		add_submenu_item(elgg_echo('friends:of'),$CONFIG->wwwroot."pg/friendsof/" . page_owner_entity()->username);
		if(is_plugin_enabled('members'))
			add_submenu_item(elgg_echo('members:browse'), $CONFIG->wwwroot . "mod/members/index.php");
	}
}

/**
 * Users initialisation function, which establishes the page handler
 *
 */
function users_init() {
	// Load config
	global $CONFIG;

	// add Friends to tools menu - if profile mod is running
	// now added to toolbar
	/*
	if ( isloggedin() && is_plugin_enabled('profile') ) {
		$user = get_loggedin_user();
		add_menu(elgg_echo('friends'), $CONFIG->wwwroot . "pg/friends/" . $user->username, array(), 'core:friends');
	}
	*/

	register_page_handler('friends', 'friends_page_handler');
	register_page_handler('friendsof', 'friends_of_page_handler');
	register_page_handler('dashboard', 'dashboard_page_handler');
	register_page_handler('register', 'registration_page_handler');
	register_page_handler('resetpassword', 'elgg_user_resetpassword_page_handler');
	register_page_handler('login', 'elgg_user_login_page_handler');

	register_action("register", true);
	register_action("useradd", true);
	register_action("friends/add");
	register_action("friends/remove");
	//register_action('friends/addcollection');
	//register_action('friends/deletecollection');
	//register_action('friends/editcollection');
	//register_action("user/spotlight");

	register_action("usersettings/save");

	register_action("user/passwordreset", TRUE);
	register_action("user/requestnewpassword", TRUE);

	// User name change
	extend_elgg_settings_page('user/settings/name', 'usersettings/user', 1);
	//register_action("user/name");

	// User password change
	extend_elgg_settings_page('user/settings/password', 'usersettings/user', 1);
	//register_action("user/password");

	// Add email settings
	extend_elgg_settings_page('user/settings/email', 'usersettings/user', 1);
	//register_action("email/save");

	// Add language settings
	extend_elgg_settings_page('user/settings/language', 'usersettings/user', 1);

	// Add default access settings
	extend_elgg_settings_page('user/settings/default_access', 'usersettings/user', 1);

	//register_action("user/language");

	// Register the user type
	register_entity_type('user','');

	register_plugin_hook('usersettings:save','user','users_settings_save');

	register_elgg_event_handler('create', 'user', 'user_create_hook_add_site_relationship');
}

/**
 * Returns a formatted list of users suitable for injecting into search.
 * @deprecated 1.7
 */
function search_list_users_by_name($hook, $user, $returnvalue, $tag) {
	elgg_deprecated_notice('search_list_users_by_name() was deprecated by new search', 1.7);
	// Change this to set the number of users that display on the search page
	$threshold = 4;

	$object = get_input('object');

	if (!get_input('offset') && (empty($object) || $object == 'user')) {
		if ($users = search_for_user($tag,$threshold)) {
			$countusers = search_for_user($tag,0,0,"",true);

			$return = elgg_view('user/search/startblurb',array('count' => $countusers, 'tag' => $tag));
			foreach($users as $user) {
				$return .= elgg_view_entity($user);
			}
			$return .= elgg_view('user/search/finishblurb',array('count' => $countusers, 'threshold' => $threshold, 'tag' => $tag));
			return $return;

		}
	}
}

function users_settings_save() {
	global $CONFIG;
	include($CONFIG->path . "actions/user/name.php");
	include($CONFIG->path . "actions/user/password.php");
	include($CONFIG->path . "actions/email/save.php");
	include($CONFIG->path . "actions/user/language.php");
	include($CONFIG->path . "actions/user/default_access.php");
}

/**
 * Runs unit tests for ElggObject
 */
function users_test($hook, $type, $value, $params) {
	global $CONFIG;
	$value[] = "{$CONFIG->path}engine/tests/objects/users.php";
	return $value;
}

//register actions *************************************************************
register_elgg_event_handler('init','system','users_init',0);
register_elgg_event_handler('pagesetup','system','users_pagesetup',0);
register_plugin_hook('unit_test', 'system', 'users_test');