aboutsummaryrefslogtreecommitdiff
path: root/engine/lib/users.php
blob: 99466bf731522bbe03a9e6fae1df5a22ca502fe3 (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
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
<?php
/**
 * Elgg users
 * Functions to manage multiple or single users in an Elgg install
 *
 * @package Elgg.Core
 * @subpackage DataModel.User
 */

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

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

/**
 * Return the user specific details of a user by a row.
 *
 * @param int $guid The ElggUser guid
 *
 * @return mixed
 */
function get_user_entity_as_row($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     The user's GUID
 * @param string $name     The user's display name
 * @param string $username The username
 * @param string $password The password
 * @param string $salt     A salt for the password
 * @param string $email    The user's email address
 * @param string $language The user's default language
 * @param string $code     A code
 *
 * @return bool
 */
function create_user_entity($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

		$query = "SELECT guid from {$CONFIG->dbprefix}users_entity where guid = {$guid}";
		if ($exists = get_data_row($query)) {
			$query = "UPDATE {$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}";

			$result = update_data($query);
			if ($result != false) {
				// Update succeeded, continue
				$entity = get_entity($guid);
				if (elgg_trigger_event('update', $entity->type, $entity)) {
					return $guid;
				} else {
					$entity->delete();
				}
			}
		} else {
			// Update failed, attempt an insert.
			$query = "INSERT into {$CONFIG->dbprefix}users_entity
				(guid, name, username, password, salt, email, language, code)
				values ($guid, '$name', '$username', '$password', '$salt', '$email', '$language', '$code')";

			$result = insert_data($query);
			if ($result !== false) {
				$entity = get_entity($guid);
				if (elgg_trigger_event('create', $entity->type, $entity)) {
					return $guid;
				} else {
					$entity->delete(); //delete_entity($guid);
				}
			}
		}
	}

	return false;
}

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

				$res = update_data($query);
				return $res;
			}
		}
	}

	return false;
}

/**
 * Ban a user
 *
 * @param int    $user_guid The user guid
 * @param string $reason    A reason
 *
 * @return bool
 */
function ban_user($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 (elgg_trigger_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
			$query = "UPDATE {$CONFIG->dbprefix}users_entity set banned='yes' where guid=$user_guid";
			return update_data($query);
		}

		return FALSE;
	}

	return FALSE;
}

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

	$user_guid = (int)$user_guid;

	$user = get_entity($user_guid);

	if (($user) && ($user->canEdit()) && ($user instanceof ElggUser)) {
		if (elgg_trigger_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);
			}


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

		return FALSE;
	}

	return FALSE;
}

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

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

	if (($user) && ($user instanceof ElggUser) && ($user->canEdit())) {
		if (elgg_trigger_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 $user_guid User GUID
 *
 * @return bool
 */
function remove_user_admin($user_guid) {
	global $CONFIG;

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

	if (($user) && ($user instanceof ElggUser) && ($user->canEdit())) {
		if (elgg_trigger_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 $guid User GUID
 *
 * @return 1
 */
function delete_user_entity($guid) {
	system_message(elgg_echo('deprecatedfunction', array('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 $friend_guid The GUID of the user to friend
 *
 * @return bool Depending on success
 */
function user_add_friend($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 $friend_guid The GUID of the user on the friends list
 *
 * @return bool Depending on success
 */
function user_remove_friend($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 $friend_guid The GUID of the friend
 *
 * @return bool
 */
function user_is_friend($user_guid, $friend_guid) {
	return check_entity_relationship($user_guid, "friend", $friend_guid) !== false;
}

/**
 * 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'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 bool   $fullview       Whether or not to display the full view (default: true)
 * @param bool   $listtypetoggle Whether or not to allow you to flip to gallery mode (default: true)
 * @param bool   $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,
$listtypetoggle = 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,
		$listtypetoggle, $pagination);
}

/**
 * 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))) {
		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]);
	}

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

	$entity = get_data_row($query, 'entity_row_to_elggstar');
	if ($entity) {
		$USERNAME_TO_GUID_MAP_CACHE[$username] = $entity->guid;
	}

	return $entity;
}

/**
 * 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]);
	}

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

	$entity = get_data_row($query, 'entity_row_to_elggstar');
	if ($entity) {
		$CODE_TO_GUID_MAP_CACHE[$code] = $entity->guid;
	}

	return $entity;
}

/**
 * Get an array of users from their email addresses
 *
 * @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');
}

/**
 * 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 $offset  Offset, defualt 0.
 *
 * @return mixed
 */
function find_active_users($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 $user_guid User GUID
 *
 * @return bool
 */
function send_new_password_request($user_guid) {
	global $CONFIG;

	$user_guid = (int)$user_guid;

	$user = get_entity($user_guid);
	if ($user) {
		// generate code
		$code = generate_random_cleartext_password();
		$user->setPrivateSetting('passwd_conf_code', $code);


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

		// generate email
		$email = elgg_echo('email:resetreq:body', array($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 $password  Text (which will then be converted into a hash and stored)
 *
 * @return bool
 */
function force_user_password_reset($user_guid, $password) {
	global $CONFIG;

	$user = get_entity($user_guid);

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

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

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

	return false;
}

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

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

	if ($user) {
		$saved_code = $user->getPrivateSetting('passwd_conf_code');

		if ($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');

				$email = elgg_echo('email:resetpassword:body', array($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 array $page Pages array
 *
 * @return void
 */
function elgg_user_resetpassword_page_handler($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 = elgg_view_form('user/passwordreset', array(), array('user' => $user));

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

	echo elgg_view_page($title, elgg_view_layout('one_column', array('content' => $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.
 *
 * @param ElggUser $user     The user this is being generated for.
 * @param string   $password Password in clear text
 *
 * @return string
 */
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 $username Username
 *
 * @return bool
 * @throws RegistrationException on invalid
 */
function validate_username($username) {
	global $CONFIG;

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

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

	// 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) {
			$msg = elgg_echo('registration:invalidchars', array($blacklist2[$n], $blacklist2));
			throw new RegistrationException($msg);
		}
	}

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

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

	if (!isset($CONFIG->min_password_length)) {
		$CONFIG->min_password_length = 6;
	}

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

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

/**
 * Simple validation of a email.
 *
 * @param string $address Email address
 *
 * @throws RegistrationException on invalid
 * @return bool
 */
function validate_email_address($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 elgg_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           GUID of a user to friend once fully registered
 * @param string $invitecode            An invite code from a friend
 *
 * @return int|false The new user's GUID; false on failure
 */
function register_user($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);
}

/**
 * Set the validation status for a user.
 *
 * @param int    $user_guid The user's GUID
 * @param bool   $status    Validated (true) or unvalidated (false)
 * @param string $method    Optional method to say how a user was validated
 * @return bool
 * @since 1.8.0
 */
function elgg_set_user_validation_status($user_guid, $status, $method = '') {
	$result1 = create_metadata($user_guid, 'validated', $status, '', 0, ACCESS_PUBLIC, false);
	$result2 = create_metadata($user_guid, 'validated_method', $method, '', 0, ACCESS_PUBLIC, false);
	if ($result1 && $result2) {
		return true;
	} else {
		return false;
	}
}

/**
 * Gets the validation status of a user.
 *
 * @param int $user_guid The user's GUID
 * @return bool|null Null means status was not set for this user.
 * @since 1.8.0
 */
function elgg_get_user_validation_status($user_guid) {
	$md = elgg_get_metadata(array(
		'guid' => $user_guid,
		'metadata_name' => 'validated'
	));
	if ($md == false) {
		return;
	}

	if ($md->value) {
		return true;
	}

	return false;
}

/**
 * Adds collection submenu items
 *
 * @return void
 */
function collections_submenu_items() {

	$user = elgg_get_logged_in_user_entity();

	elgg_register_menu_item('page', array(
		'name' => 'friends:view:collections',
		'text' => elgg_echo('friends:collections'),
		'href' => "pg/collections/$user->username",
	));
/*
	elgg_register_menu_item('page', array(
		'name' => 'friends:collections:add',
		'text' => elgg_echo('friends:collections:add'),
		'href' => "pg/collections/add",
	));
 * 
 */
}

/**
 * Page handler for friends
 *
 * @param array $page_elements Page elements
 *
 * @return void
 */
function friends_page_handler($page_elements) {
	if (isset($page_elements[0]) && $user = get_user_by_username($page_elements[0])) {
		set_page_owner($user->getGUID());
	}
	if (elgg_get_logged_in_user_guid() == elgg_get_page_owner_guid()) {
		collections_submenu_items();
	}
	require_once(dirname(dirname(dirname(__FILE__))) . "/pages/friends/index.php");
}

/**
 * Page handler for friends of
 *
 * @param array $page_elements Page elements
 *
 * @return void
 */
function friends_of_page_handler($page_elements) {
	elgg_set_context('friends');
	if (isset($page_elements[0]) && $user = get_user_by_username($page_elements[0])) {
		set_page_owner($user->getGUID());
	}
	if (elgg_get_logged_in_user_guid() == elgg_get_page_owner_guid()) {
		collections_submenu_items();
	}
	require_once(dirname(dirname(dirname(__FILE__))) . "/pages/friends/of.php");
}

/**
 * Page handler for friends collections
 *
 * @param array $page_elements Page elements
 *
 * @return void
 */
function collections_page_handler($page_elements) {
	elgg_set_context('friends');
	$base = elgg_get_config('path');
	if (isset($page_elements[0])) {
		if ($page_elements[0] == "add") {
			set_page_owner(elgg_get_logged_in_user_guid());
			collections_submenu_items();
			require_once "{$base}pages/friends/collections/add.php";
		} else {
			$user = get_user_by_username($page_elements[0]);
			if ($user) {
				set_page_owner($user->getGUID());
				if (elgg_get_logged_in_user_guid() == elgg_get_page_owner_guid()) {
					collections_submenu_items();
				}
				require_once "{$base}pages/friends/collections/view.php";
			}
		}
	}
}

/**
 * Page handler for dashboard
 *
 * @param array $page_elements Page elements
 *
 * @return void
 */
function dashboard_page_handler($page_elements) {
	require_once(dirname(dirname(dirname(__FILE__))) . "/pages/dashboard.php");
}


/**
 * Page handler for registration
 *
 * @param array $page_elements Page elements
 *
 * @return void
 */
function registration_page_handler($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.
 *
 * @return void
 * @todo finish
 */
function elgg_user_login_page_handler() {
	$login_box = elgg_view('core/account/login_box');
	$content = elgg_view_layout('one_column', array('content' => $login_box));
	echo elgg_view_page(elgg_echo('login'), $content);
}

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

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

	execute_delayed_write_query($query);
}

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

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

	execute_delayed_write_query($query);
}

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

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

/**
 * Serves the user's avatar
 *
 * @param string $hook
 * @param string $entity_type
 * @param string $returnvalue
 * @param array $params
 * @return string
 */
function user_avatar_hook($hook, $entity_type, $returnvalue, $params) {
	$user = $params['entity'];
	$size = $params['size'];

	if (isset($user->icontime)) {
		return "pg/avatar/view/$user->username/$size/$user->icontime";
	} else {
		return "_graphics/icons/user/default{$size}.gif";
	}
}

/**
 * Setup the default user hover menu
 */
function elgg_user_hover_menu($hook, $type, $return, $params) {
	$user = $params['entity'];

	if (elgg_is_logged_in()) {
		if (elgg_get_logged_in_user_guid() != $user->guid) {
			if ($user->isFriend()) {
				$url = "action/friends/remove?friend={$user->guid}";
				$text = elgg_echo('friend:remove');
			} else {
				$url = "action/friends/add?friend={$user->guid}";
				$text = elgg_echo('friend:add');
			}
			$url = elgg_add_action_tokens_to_url($url);
			$item = new ElggMenuItem('addfriend', $text, $url);
			$item->setSection('action');
			$return[] = $item;
		} else {
			$url = "pg/profile/$user->username/edit";
			$item = new ElggMenuItem('profile:edit', elgg_echo('profile:edit'), $url);
			$item->setSection('action');
			$return[] = $item;

			$url = "pg/avatar/edit/$user->username";
			$item = new ElggMenuItem('avatar:edit', elgg_echo('avatar:edit'), $url);
			$item->setSection('action');
			$return[] = $item;
		}
	}

	// prevent admins from banning or deleting themselves
	if (elgg_get_logged_in_user_guid() == $user->guid) {
		return $return;
	}

	if (elgg_is_admin_logged_in()) {
		$actions = array();
		if (!$user->isBanned()) {
			$actions[] = 'ban';
		} else {
			$actions[] = 'unban';
		}
		$actions[] = 'delete';
		$actions[] = 'resetpassword';
		if (!$user->isAdmin()) {
			$actions[] = 'makeadmin';
		} else {
			$actions[] = 'removeadmin';
		}

		foreach ($actions as $action) {
			$url = "action/admin/user/$action?guid={$user->guid}";
			$url = elgg_add_action_tokens_to_url($url);
			$item = new ElggMenuItem($action, elgg_echo($action), $url);
			$item->setSection('admin');
			$item->setLinkClass('elgg-requires-confirmation');

			$return[] = $item;
		}

		$url = "pg/profile/$user->username/edit";
		$item = new ElggMenuItem('profile:edit', elgg_echo('profile:edit'), $url);
		$item->setSection('admin');
		$return[] = $item;
	}

	return $return;
}

/**
 * This function loads a set of default fields into the profile, then triggers a hook letting other plugins to edit
 * add and delete fields.
 *
 * Note: This is a secondary system:init call and is run at a super low priority to guarantee that it is called after all
 * other plugins have initialised.
 */
function elgg_profile_fields_setup() {
	global $CONFIG;

	$profile_defaults = array (
		'description' => 'longtext',
		'briefdescription' => 'text',
		'location' => 'tags',
		'interests' => 'tags',
		'skills' => 'tags',
		'contactemail' => 'email',
		'phone' => 'text',
		'mobile' => 'text',
		'website' => 'url',
		'twitter' => 'text'
	);

	$loaded_default = array();
	if ($fieldlist = elgg_get_config('profile_custom_fields')) {
		if (!empty($fieldlist)) {
			$fieldlistarray = explode(',', $fieldlist);
			$loaded_defaults = array();
			foreach ($fieldlistarray as $listitem) {
				if ($translation = elgg_get_config("admin_defined_profile_{$listitem}")) {
					$type = elgg_get_config("admin_defined_profile_type_{$listitem}");
					$loaded_defaults["admin_defined_profile_{$listitem}"] = $type;
					add_translation(get_current_language(), array("profile:admin_defined_profile_{$listitem}" => $translation));
				}
			}
		}
	}

	if (count($loaded_defaults)) {
		$CONFIG->profile_using_custom = true;
		$profile_defaults = $loaded_defaults;
	}

	$CONFIG->profile_fields = elgg_trigger_plugin_hook('profile:fields', 'profile', NULL, $profile_defaults);

	// register any tag metadata names
	foreach ($CONFIG->profile_fields as $name => $type) {
		if ($type == 'tags') {
			elgg_register_tag_metadata_name($name);
			// register a tag name translation
			add_translation(get_current_language(), array("tag_names:$name" => elgg_echo("profile:$name")));
		}
	}
}

/**
 * Avatar page handler
 *
 * /pg/avatar/edit/<username>
 * /pg/avatar/view/<username>/<size>/<icontime>
 *
 * @param array $page
 */
function elgg_avatar_page_handler($page) {
	global $CONFIG;

	set_input('username', $page[1]);

	if ($page[0] == 'edit') {
		require_once("{$CONFIG->path}pages/avatar/edit.php");
	} else {
		set_input('size', $page[2]);
		require_once("{$CONFIG->path}pages/avatar/view.php");
	}
}

/**
 * Profile page handler
 *
 * @param array $page
 */
function elgg_profile_page_handler($page) {
	global $CONFIG;

	$user = get_user_by_username($page[0]);
	elgg_set_page_owner_guid($user->guid);

	if ($page[1] == 'edit') {
		require_once("{$CONFIG->path}pages/profile/edit.php");
	}
}

/**
 * Members page handler
 *
 * @param array $page url segments
 */
function elgg_members_page_handler($page) {
	global $CONFIG;

	if (!isset($page[0])) {
		$page[0] = 'newest';
	}

	$vars = array();
	$vars['page'] = $page[0];

	if ($page[0] == 'search') {
		$vars['search_type'] = $page[1];
		require_once("{$CONFIG->path}pages/members/search.php");
	} else {
		require_once("{$CONFIG->path}pages/members/index.php");
	}
}

/**
 * Sets up user-related menu items
 *
 * @return void
 */
function users_pagesetup() {

	if (elgg_get_page_owner_guid()) {
		$params = array(
			'name' => 'friends',
			'text' => elgg_echo('friends'),
			'href' => 'pg/friends/' . elgg_get_page_owner_entity()->username,
			'contexts' => array('friends')
		);
		elgg_register_menu_item('page', $params);

		$params = array(
			'name' => 'friends:of',
			'text' => elgg_echo('friends:of'),
			'href' => 'pg/friendsof/' . elgg_get_page_owner_entity()->username,
			'contexts' => array('friends')
		);
		elgg_register_menu_item('page', $params);
	}

	// topbar
	$user = elgg_get_logged_in_user_entity();
	if ($user) {
		elgg_register_menu_item('page', array(
			'name' => 'edit_avatar',
			'href' => "pg/avatar/edit/{$user->username}",
			'text' => elgg_echo('avatar:edit'),
			'contexts' => array('profile_edit'),
		));

		elgg_register_menu_item('page', array(
			'name' => 'edit_profile',
			'href' => "pg/profile/{$user->username}/edit",
			'text' => elgg_echo('profile:edit'),
			'contexts' => array('profile_edit'),
		));

		elgg_register_menu_item('topbar', array(
			'name' => 'profile',
			'href' =>  $user->getURL(),
			'text' => "<img src=\"{$user->getIconURL('topbar')}\" alt=\"$user->name\" />",
			'weight' => 100,
		));

		elgg_register_menu_item('topbar', array(
			'name' => 'friends',
			'href' => "pg/friends/{$user->username}",
			'text' => elgg_view_icon('friends'),
			'title' => elgg_echo('friends'),
			'weight' => 300,
		));

		elgg_register_menu_item('topbar', array(
			'name' => 'usersettings',
			'href' => "pg/settings/user/{$user->username}",
			'text' => elgg_view_icon('settings') . elgg_echo('settings'),
			'weight' => 500,
			'section' => 'alt',
		));

		elgg_register_menu_item('topbar', array(
			'name' => 'logout',
			'href' => "action/logout",
			'text' => elgg_echo('logout'),
			'is_action' => TRUE,
			'weight' => 1000,
			'section' => 'alt',
		));

	}
}

/**
 * Users initialisation function, which establishes the page handler
 *
 * @return void
 */
function users_init() {
	global $CONFIG;

	elgg_register_page_handler('friends', 'friends_page_handler');
	elgg_register_page_handler('friendsof', 'friends_of_page_handler');
	elgg_register_page_handler('dashboard', 'dashboard_page_handler');
	elgg_register_page_handler('register', 'registration_page_handler');
	elgg_register_page_handler('resetpassword', 'elgg_user_resetpassword_page_handler');
	elgg_register_page_handler('login', 'elgg_user_login_page_handler');
	elgg_register_page_handler('members', 'elgg_members_page_handler');
	elgg_register_page_handler('avatar', 'elgg_avatar_page_handler');
	elgg_register_page_handler('profile', 'elgg_profile_page_handler');
	elgg_register_page_handler('collections', 'collections_page_handler');

	$item = new ElggMenuItem('members', elgg_echo('members'), 'pg/members');
	elgg_register_menu_item('site', $item);

	elgg_register_plugin_hook_handler('register', 'menu:user_hover', 'elgg_user_hover_menu');

	elgg_register_action("register", '', 'public');
	elgg_register_action("useradd", '', 'public');
	elgg_register_action("friends/add");
	elgg_register_action("friends/remove");
	elgg_register_action('avatar/upload');
	elgg_register_action('avatar/crop');
	elgg_register_action('profile/edit');

	elgg_register_action('friends/collections/add');
	elgg_register_action('friends/collections/delete');
	elgg_register_action('friends/collections/edit');

	elgg_register_plugin_hook_handler('entity:icon:url', 'user', 'user_avatar_hook');

	elgg_register_action("user/passwordreset", '', 'public');
	elgg_register_action("user/requestnewpassword", '', 'public');

	elgg_register_widget_type('friends', elgg_echo("friends"), elgg_echo('friends:widget:description'));

	// extend the account settings form
	elgg_extend_view('forms/account/settings', 'core/settings/account/name', 100);
	elgg_extend_view('forms/account/settings', 'core/settings/account/password', 100);
	elgg_extend_view('forms/account/settings', 'core/settings/account/email', 100);
	elgg_extend_view('forms/account/settings', 'core/settings/account/language', 100);
	elgg_extend_view('forms/account/settings', 'core/settings/account/default_access', 100);

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

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

/**
 * Runs unit tests for ElggObject
 *
 * @param sting  $hook   unit_test
 * @param string $type   system
 * @param mixed  $value  Array of tests
 * @param mixed  $params Params
 *
 * @return array
 */
function users_test($hook, $type, $value, $params) {
	global $CONFIG;
	$value[] = "{$CONFIG->path}engine/tests/objects/users.php";
	return $value;
}

elgg_register_event_handler('init', 'system', 'users_init', 0);
elgg_register_event_handler('init', 'system', 'elgg_profile_fields_setup', 10000); // Ensure this runs after other plugins
elgg_register_event_handler('pagesetup', 'system', 'users_pagesetup', 0);
elgg_register_plugin_hook_handler('unit_test', 'system', 'users_test');