aboutsummaryrefslogtreecommitdiff
path: root/engine/lib/configuration.php
blob: 998cd194368532758cb7244e0a5546c0fd724559 (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
<?php
/**
 * Elgg configuration procedural code.
 *
 * Includes functions for manipulating the configuration values stored in the database
 * Plugin authors should use the {@link elgg_get_config()}, {@link elgg_set_config()},
 * {@link elgg_save_config()}, and {@unset_config()} functions to access or update
 * config values.
 *
 * Elgg's configuration is split among 2 tables and 1 file:
 * - dbprefix_config
 * - dbprefix_datalists
 * - engine/settings.php (See {@link settings.example.php})
 *
 * Upon system boot, all values in dbprefix_config are read into $CONFIG.
 *
 * @package Elgg.Core
 * @subpackage Configuration
 */

/**
 * Get the URL for the current (or specified) site
 *
 * @param int $site_guid The GUID of the site whose URL we want to grab
 * @return string
 * @since 1.8.0
 */
function elgg_get_site_url($site_guid = 0) {
	if ($site_guid == 0) {
		global $CONFIG;
		return $CONFIG->wwwroot;
	}

	$site = get_entity($site_guid);

	if (!$site instanceof ElggSite) {
		return false;
	}

	return $site->url;
}

/**
 * Get the plugin path for this installation
 *
 * @return string
 * @since 1.8.0
 */
function elgg_get_plugins_path() {
	global $CONFIG;
	return $CONFIG->pluginspath;
}

/**
 * Get the data directory path for this installation
 *
 * @return string
 * @since 1.8.0
 */
function elgg_get_data_path() {
	global $CONFIG;
	return $CONFIG->dataroot;
}

/**
 * Get the root directory path for this installation
 *
 * @return string
 * @since 1.8.0
 */
function elgg_get_root_path() {
	global $CONFIG;
	return $CONFIG->path;
}

/**
 * Get an Elgg configuration value
 *
 * @param string $name      Name of the configuration value
 * @param int    $site_guid NULL for installation setting, 0 for default site
 *
 * @return mixed Configuration value or null if it does not exist
 * @since 1.8.0
 */
function elgg_get_config($name, $site_guid = 0) {
	global $CONFIG;

	$name = trim($name);

	if (isset($CONFIG->$name)) {
		return $CONFIG->$name;
	}

	if ($site_guid === NULL) {
		// installation wide setting
		$value = datalist_get($name);
	} else {
		// site specific setting
		if ($site_guid == 0) {
			$site_guid = (int) $CONFIG->site_id;
		}
		$value = get_config($name, $site_guid);
	}

	if ($value !== false) {
		$CONFIG->$name = $value;
		return $value;
	}

	return null;
}

/**
 * Set an Elgg configuration value
 *
 * @warning This does not persist the configuration setting. Use elgg_save_config()
 *
 * @param string $name  Name of the configuration value
 * @param mixed  $value Value
 *
 * @return void
 * @since 1.8.0
 */
function elgg_set_config($name, $value) {
	global $CONFIG;

	$name = trim($name);

	$CONFIG->$name = $value;
}

/**
 * Save a configuration setting
 *
 * @param string $name      Configuration name (cannot be greater than 32 characters)
 * @param mixed  $value     Configuration value. Should be string for installation setting
 * @param int    $site_guid NULL for installation setting, 0 for default site
 *
 * @return bool
 * @since 1.8.0
 */
function elgg_save_config($name, $value, $site_guid = 0) {
	global $CONFIG;

	$name = trim($name);

	if (strlen($name) > 255) {
		elgg_log("The name length for configuration variables cannot be greater than 255", "ERROR");
		return false;
	}

	elgg_set_config($name, $value);

	if ($site_guid === NULL) {
		if (is_array($value) || is_object($value)) {
			return false;
		}
		return datalist_set($name, $value);
	} else {
		if ($site_guid == 0) {
			$site_guid = (int) $CONFIG->site_id;
		}
		return set_config($name, $value, $site_guid);
	}
}

/**
 * Check that installation has completed and the database is populated.
 *
 * @throws InstallationException
 * @return void
 * @access private
 */
function verify_installation() {
	global $CONFIG;

	if (isset($CONFIG->installed)) {
		return $CONFIG->installed;
	}

	try {
		$dblink = get_db_link('read');
		if (!$dblink) {
			throw new DatabaseException();
		}

		mysql_query("SELECT value FROM {$CONFIG->dbprefix}datalists WHERE name = 'installed'", $dblink);
		if (mysql_errno($dblink) > 0) {
			throw new DatabaseException();
		}

		$CONFIG->installed = true;

	} catch (DatabaseException $e) {
		throw new InstallationException(elgg_echo('InstallationException:SiteNotInstalled'));
	}
}

/**
 * An array of key value pairs from the datalists table.
 *
 * Used as a cache in datalist functions.
 *
 * @global array $DATALIST_CACHE
 */
$DATALIST_CACHE = array();

/**
 * Get the value of a datalist element.
 *
 * @internal Datalists are stored in the datalist table.
 *
 * @tip Use datalists to store information common to a full installation.
 *
 * @param string $name The name of the datalist
 * @return string|null|false String if value exists, null if doesn't, false on error
 * @access private
 */
function datalist_get($name) {
	global $CONFIG, $DATALIST_CACHE;

	$name = trim($name);

	// cannot store anything longer than 32 characters in db, so catch here
	if (elgg_strlen($name) > 32) {
		elgg_log("The name length for configuration variables cannot be greater than 32", "ERROR");
		return false;
	}

	$name = sanitise_string($name);
	if (isset($DATALIST_CACHE[$name])) {
		return $DATALIST_CACHE[$name];
	}

	// If memcache enabled then cache value in memcache
	$value = null;
	static $datalist_memcache;
	if ((!$datalist_memcache) && (is_memcache_available())) {
		$datalist_memcache = new ElggMemcache('datalist_memcache');
	}
	if ($datalist_memcache) {
		$value = $datalist_memcache->load($name);
	}
	if ($value) {
		return $value;
	}

	// [Marcus Povey 20090217 : Now retrieving all datalist values on first
	// load as this saves about 9 queries per page]
	// This also causes OOM problems when the datalists table is large
	// @todo make a list of datalists that we want to get in one grab
	$result = get_data("SELECT * from {$CONFIG->dbprefix}datalists");
	if ($result) {
		foreach ($result as $row) {
			$DATALIST_CACHE[$row->name] = $row->value;

			// Cache it if memcache is available
			if ($datalist_memcache) {
				$datalist_memcache->save($row->name, $row->value);
			}
		}

		if (isset($DATALIST_CACHE[$name])) {
			return $DATALIST_CACHE[$name];
		}
	}

	return null;
}

/**
 * Set the value for a datalist element.
 *
 * @param string $name  The name of the datalist
 * @param string $value The new value
 *
 * @return bool
 * @access private
 */
function datalist_set($name, $value) {
	global $CONFIG, $DATALIST_CACHE;

	// cannot store anything longer than 32 characters in db, so catch before we set
	if (elgg_strlen($name) > 255) {
		elgg_log("The name length for configuration variables cannot be greater than 255", "ERROR");
		return false;
	}

	$sanitised_name = sanitise_string($name);
	$sanitised_value = sanitise_string($value);

	// If memcache is available then invalidate the cached copy
	static $datalist_memcache;
	if ((!$datalist_memcache) && (is_memcache_available())) {
		$datalist_memcache = new ElggMemcache('datalist_memcache');
	}

	if ($datalist_memcache) {
		$datalist_memcache->delete($name);
	}

	$success = insert_data("INSERT into {$CONFIG->dbprefix}datalists"
		. " set name = '{$sanitised_name}', value = '{$sanitised_value}'"
		. " ON DUPLICATE KEY UPDATE value='{$sanitised_value}'");

	if ($success) {
		$DATALIST_CACHE[$name] = $value;
		return true;
	} else {
		return false;
	}
}

/**
 * Run a function one time per installation.
 *
 * If you pass a timestamp as the second argument, it will run the function
 * only if (i) it has never been run before or (ii) the timestamp is >=
 * the last time it was run.
 *
 * @warning Functions are determined by their name.  If you change the name of a function
 * it will be run again.
 *
 * @tip Use $timelastupdatedcheck in your plugins init function to perform automated
 * upgrades.  Schedule a function to run once and pass the timestamp of the new release.
 * This will cause the run once function to be run on all installations.  To perform
 * additional upgrades, create new functions for each release.
 *
 * @warning The function name cannot be longer than 32 characters long due to
 * the current schema for the datalist table.
 *
 * @internal A datalist entry $functioname is created with the value of time().
 *
 * @param string $functionname         The name of the function you want to run.
 * @param int    $timelastupdatedcheck A UNIX timestamp. If time() is > than this,
 *                                     this function will be run again.
 *
 * @return bool
 */
function run_function_once($functionname, $timelastupdatedcheck = 0) {
	$lastupdated = datalist_get($functionname);
	if ($lastupdated) {
		$lastupdated = (int) $lastupdated;
	} elseif ($lastupdated !== false) {
		$lastupdated = 0;
	} else {
		// unable to check datalist
		return false;
	}
	if (is_callable($functionname) && $lastupdated <= $timelastupdatedcheck) {
		$functionname();
		datalist_set($functionname, time());
		return true;
	} else {
		return false;
	}
}

/**
 * Removes a config setting.
 *
 * @internal
 * These settings are stored in the dbprefix_config table and read during system
 * boot into $CONFIG.
 *
 * @param string $name      The name of the field.
 * @param int    $site_guid Optionally, the GUID of the site (current site is assumed by default).
 *
 * @return int|false The number of affected rows or false on error.
 *
 * @see get_config()
 * @see set_config()
 */
function unset_config($name, $site_guid = 0) {
	global $CONFIG;

	if (isset($CONFIG->$name)) {
		unset($CONFIG->$name);
	}

	$name = sanitise_string($name);
	$site_guid = (int) $site_guid;
	if ($site_guid == 0) {
		$site_guid = (int) $CONFIG->site_id;
	}

	$query = "delete from {$CONFIG->dbprefix}config where name='$name' and site_guid=$site_guid";
	return delete_data($query);
}

/**
 * Add or update a config setting.
 *
 * If the config name already exists, it will be updated to the new value.
 *
 * @internal
 * These settings are stored in the dbprefix_config table and read during system
 * boot into $CONFIG.
 *
 * @param string $name      The name of the configuration value
 * @param string $value     Its value
 * @param int    $site_guid Optionally, the GUID of the site (current site is assumed by default)
 *
 * @return 0
 * @todo The config table doens't have numeric primary keys so insert_data returns 0.
 * @todo Use "INSERT ... ON DUPLICATE KEY UPDATE" instead of trying to delete then add.
 * @see unset_config()
 * @see get_config()
 * @access private
 */
function set_config($name, $value, $site_guid = 0) {
	global $CONFIG;

	$name = trim($name);

	// cannot store anything longer than 32 characters in db, so catch before we set
	if (elgg_strlen($name) > 32) {
		elgg_log("The name length for configuration variables cannot be greater than 32", "ERROR");
		return false;
	}

	// Unset existing
	unset_config($name, $site_guid);

	$site_guid = (int) $site_guid;
	if ($site_guid == 0) {
		$site_guid = (int) $CONFIG->site_id;
	}
	$CONFIG->$name = $value;
	$value = sanitise_string(serialize($value));

	$query = "insert into {$CONFIG->dbprefix}config"
		. " set name = '{$name}', value = '{$value}', site_guid = {$site_guid}";
	$result = insert_data($query);
	return $result !== false;
}

/**
 * Gets a configuration value
 *
 * @internal
 * These settings are stored in the dbprefix_config table and read during system
 * boot into $CONFIG.
 *
 * @param string $name      The name of the config value
 * @param int    $site_guid Optionally, the GUID of the site (current site is assumed by default)
 *
 * @return mixed|null
 * @see set_config()
 * @see unset_config()
 * @access private
 */
function get_config($name, $site_guid = 0) {
	global $CONFIG;

	$name = sanitise_string($name);
	$site_guid = (int) $site_guid;

	// check for deprecated values.
	// @todo might be a better spot to define this?
	$new_name = false;
	switch($name) {
		case 'viewpath':
			$new_name = 'view_path';
			$dep_version = 1.8;
			break;

		case 'pluginspath':
			$new_name = 'plugins_path';
			$dep_version = 1.8;
			break;

		case 'sitename':
			$new_name = 'site_name';
			$dep_version = 1.8;
			break;
	}

	// show dep message
	if ($new_name) {
		$name = $new_name;
		elgg_deprecated_notice($msg, $dep_version);
	}

	// decide from where to return the value
	if (isset($CONFIG->$name)) {
		return $CONFIG->$name;
	}

	if ($site_guid == 0) {
		$site_guid = (int) $CONFIG->site_id;
	}

	$result = get_data_row("SELECT value FROM {$CONFIG->dbprefix}config
		WHERE name = '{$name}' and site_guid = {$site_guid}");

	if ($result) {
		$result = $result->value;
		$result = unserialize($result->value);
		$CONFIG->$name = $result;
		return $result;
	}

	return null;
}

/**
 * Loads all configuration values from the dbprefix_config table into $CONFIG.
 *
 * @param int $site_guid Optionally, the GUID of the site (current site is assumed by default)
 *
 * @return bool
 * @access private
 */
function get_all_config($site_guid = 0) {
	global $CONFIG;

	$site_guid = (int) $site_guid;

	if ($site_guid == 0) {
		$site_guid = (int) $CONFIG->site_guid;
	}

	if ($result = get_data("SELECT * FROM {$CONFIG->dbprefix}config WHERE site_guid = $site_guid")) {
		foreach ($result as $r) {
			$name = $r->name;
			$value = $r->value;
			$CONFIG->$name = unserialize($value);
		}

		return true;
	}
	return false;
}

/**
 * Loads configuration related to this site
 *
 * This loads from the config database table and the site entity
 * @access private
 */
function _elgg_load_site_config() {
	global $CONFIG;

	$CONFIG->site_guid = (int) datalist_get('default_site');
	$CONFIG->site_id = $CONFIG->site_guid;
	$CONFIG->site = get_entity($CONFIG->site_guid);
	if (!$CONFIG->site) {
		throw new InstallationException(elgg_echo('InstallationException:SiteNotInstalled'));
	}

	$CONFIG->wwwroot = $CONFIG->site->url;
	$CONFIG->sitename = $CONFIG->site->name;
	$CONFIG->sitedescription = $CONFIG->site->description;
	$CONFIG->siteemail = $CONFIG->site->email;
	$CONFIG->url = $CONFIG->wwwroot;

	get_all_config();
}

/**
 * Loads configuration related to Elgg as an application
 *
 * This loads from the datalists database table
 * @access private
 */
function _elgg_load_application_config() {
	global $CONFIG;

	$install_root = str_replace("\\", "/", dirname(dirname(dirname(__FILE__))));
	$defaults = array(
		'path'			=>	"$install_root/",
		'view_path'		=>	"$install_root/views/",
		'plugins_path'	=>	"$install_root/mod/",
		'language'		=>	'en',

		// compatibility with old names for plugins not using elgg_get_config()
		'viewpath'		=>	"$install_root/views/",
		'pluginspath'	=>	"$install_root/mod/",
	);

	foreach ($defaults as $name => $value) {
		if (empty($CONFIG->$name)) {
			$CONFIG->$name = $value;
		}
	}

	$path = datalist_get('path');
	if (!empty($path)) {
		$CONFIG->path = $path;
	}
	$dataroot = datalist_get('dataroot');
	if (!empty($dataroot)) {
		$CONFIG->dataroot = $dataroot;
	}
	$simplecache_enabled = datalist_get('simplecache_enabled');
	if ($simplecache_enabled !== false) {
		$CONFIG->simplecache_enabled = $simplecache_enabled;
	} else {
		$CONFIG->simplecache_enabled = 1;
	}
	$system_cache_enabled = datalist_get('system_cache_enabled');
	if ($system_cache_enabled !== false) {
		$CONFIG->system_cache_enabled = $system_cache_enabled;
	} else {
		$CONFIG->system_cache_enabled = 1;
	}

	// initialize context here so it is set before the get_input call
	$CONFIG->context = array();

	// needs to be set before system, init for links in html head
	$viewtype = get_input('view', 'default');
	$lastcached = datalist_get("simplecache_lastcached_$viewtype");
	$CONFIG->lastcache = $lastcached;

	$CONFIG->i18n_loaded_from_cache = false;

	// this must be synced with the enum for the entities table
	$CONFIG->entity_types = array('group', 'object', 'site', 'user');
}