aboutsummaryrefslogtreecommitdiff
path: root/engine/lib/notification.php
blob: 44539d8b5a08be65e229f988a3b9d23d15c87b31 (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
<?php
/**
 * Notifications
 * This file contains classes and functions which allow plugins to register and send notifications.
 *
 * There are notification methods which are provided out of the box
 * (see notification_init() ). Each method is identified by a string, e.g. "email".
 *
 * To register an event use register_notification_handler() and pass the method name and a
 * handler function.
 *
 * To send a notification call notify() passing it the method you wish to use combined with a
 * number of method specific addressing parameters.
 *
 * Catch NotificationException to trap errors.
 *
 * @package Elgg.Core
 * @subpackage Notifications
 */

/** Notification handlers */
global $NOTIFICATION_HANDLERS;
$NOTIFICATION_HANDLERS = array();

/**
 * This function registers a handler for a given notification type (eg "email")
 *
 * @param string $method  The method
 * @param string $handler The handler function, in the format
 *                        "handler(ElggEntity $from, ElggUser $to, $subject,
 *                        $message, array $params = NULL)". This function should
 *                        return false on failure, and true/a tracking message ID on success.
 * @param array  $params  An associated array of other parameters for this handler
 *                        defining some properties eg. supported msg length or rich text support.
 *
 * @return bool
 */
function register_notification_handler($method, $handler, $params = NULL) {
	global $NOTIFICATION_HANDLERS;

	if (is_callable($handler)) {
		$NOTIFICATION_HANDLERS[$method] = new stdClass;

		$NOTIFICATION_HANDLERS[$method]->handler = $handler;
		if ($params) {
			foreach ($params as $k => $v) {
				$NOTIFICATION_HANDLERS[$method]->$k = $v;
			}
		}

		return true;
	}

	return false;
}

/**
 * This function unregisters a handler for a given notification type (eg "email")
 *
 * @param string $method The method
 *
 * @return void
 * @since 1.7.1
 */
function unregister_notification_handler($method) {
	global $NOTIFICATION_HANDLERS;

	if (isset($NOTIFICATION_HANDLERS[$method])) {
		unset($NOTIFICATION_HANDLERS[$method]);
	}
}

/**
 * Notify a user via their preferences.
 *
 * @param mixed  $to               Either a guid or an array of guid's to notify.
 * @param int    $from             GUID of the sender, which may be a user, site or object.
 * @param string $subject          Message subject.
 * @param string $message          Message body.
 * @param array  $params           Misc additional parameters specific to various methods.
 * @param mixed  $methods_override A string, or an array of strings specifying the delivery
 *                                 methods to use - or leave blank for delivery using the
 *                                 user's chosen delivery methods.
 *
 * @return array Compound array of each delivery user/delivery method's success or failure.
 * @throws NotificationException
 */
function notify_user($to, $from, $subject, $message, array $params = NULL, $methods_override = "") {
	global $NOTIFICATION_HANDLERS, $CONFIG;

	// Sanitise
	if (!is_array($to)) {
		$to = array((int)$to);
	}
	$from = (int)$from;
	//$subject = sanitise_string($subject);

	// Get notification methods
	if (($methods_override) && (!is_array($methods_override))) {
		$methods_override = array($methods_override);
	}

	$result = array();

	foreach ($to as $guid) {
		// Results for a user are...
		$result[$guid] = array();

		if ($guid) { // Is the guid > 0?
			// Are we overriding delivery?
			$methods = $methods_override;
			if (!$methods) {
				$tmp = (array)get_user_notification_settings($guid);
				$methods = array();
				foreach ($tmp as $k => $v) {
					// Add method if method is turned on for user!
					if ($v) {
						$methods[] = $k;
					}
				}
			}

			if ($methods) {
				// Deliver
				foreach ($methods as $method) {

					if (!isset($NOTIFICATION_HANDLERS[$method])) {
						continue;
					}

					// Extract method details from list
					$details = $NOTIFICATION_HANDLERS[$method];
					$handler = $details->handler;

					if ((!$NOTIFICATION_HANDLERS[$method]) || (!$handler)) {
						error_log(elgg_echo('NotificationException:NoHandlerFound', array($method)));
					}

					elgg_log("Sending message to $guid using $method");

					// Trigger handler and retrieve result.
					try {
						$result[$guid][$method] = $handler(
							$from ? get_entity($from) : NULL, 	// From entity
							get_entity($guid), 					// To entity
							$subject,							// The subject
							$message, 			// Message
							$params								// Params
						);
					} catch (Exception $e) {
						error_log($e->getMessage());
					}

				}
			}
		}
	}

	return $result;
}

/**
 * Get the notification settings for a given user.
 *
 * @param int $user_guid The user id
 *
 * @return stdClass
 */
function get_user_notification_settings($user_guid = 0) {
	$user_guid = (int)$user_guid;

	if ($user_guid == 0) {
		$user_guid = get_loggedin_userid();
	}

	$all_metadata = get_metadata_for_entity($user_guid);
	if ($all_metadata) {
		$prefix = "notification:method:";
		$return = new stdClass;

		foreach ($all_metadata as $meta) {
			$name = substr($meta->name, strlen($prefix));
			$value = $meta->value;

			if (strpos($meta->name, $prefix) === 0) {
				$return->$name = $value;
			}
		}

		return $return;
	}

	return false;
}

/**
 * Set a user notification pref.
 *
 * @param int    $user_guid The user id.
 * @param string $method    The delivery method (eg. email)
 * @param bool   $value     On(true) or off(false).
 *
 * @return bool
 */
function set_user_notification_setting($user_guid, $method, $value) {
	$user_guid = (int)$user_guid;
	$method = sanitise_string($method);

	$user = get_entity($user_guid);
	if (!$user) {
		$user = get_loggedin_user();
	}

	if (($user) && ($user instanceof ElggUser)) {
		$prefix = "notification:method:$method";
		$user->$prefix = $value;
		$user->save();

		return true;
	}

	return false;
}

/**
 * Send a notification via email.
 *
 * @param ElggEntity $from    The from user/site/object
 * @param ElggUser   $to      To which user?
 * @param string     $subject The subject of the message.
 * @param string     $message The message body
 * @param array      $params  Optional parameters (none taken in this instance)
 *
 * @return bool
 */
function email_notify_handler(ElggEntity $from, ElggUser $to, $subject, $message,
array $params = NULL) {

	global $CONFIG;

	if (!$from) {
		$msg = elgg_echo('NotificationException:MissingParameter', array('from'));
		throw new NotificationException($msg);
	}

	if (!$to) {
		$msg = elgg_echo('NotificationException:MissingParameter', array('to'));
		throw new NotificationException($msg);
	}

	if ($to->email == "") {
		$msg = elgg_echo('NotificationException:NoEmailAddress', array($to->guid));
		throw new NotificationException($msg);
	}

	// To
	$to = $to->email;

	// From
	$site = get_entity($CONFIG->site_guid);
	// If there's an email address, use it - but only if its not from a user.
	if (!($from instanceof ElggUser) && $from->email) {
		$from = $from->email;
	} else if ($site && $site->email) {
		// Use email address of current site if we cannot use sender's email
		$from = $site->email;
	} else {
		// If all else fails, use the domain of the site.
		$from = 'noreply@' . get_site_domain($CONFIG->site_guid);
	}

	return elgg_send_email($from, $to, $subject, $message);
}

/**
 * Send an email to any email address
 *
 * @param string $from    Email address or string: "name <email>"
 * @param string $to      Email address or string: "name <email>"
 * @param string $subject The subject of the message
 * @param string $body    The message body
 * @param array  $params  Optional parameters (none used in this function)
 *
 * @return bool
 * @since 1.7.2
 */
function elgg_send_email($from, $to, $subject, $body, array $params = NULL) {
	global $CONFIG;

	if (!$from) {
		$msg = elgg_echo('NotificationException:NoEmailAddress', array('from'));
		throw new NotificationException($msg);
	}

	if (!$to) {
		$msg = elgg_echo('NotificationException:NoEmailAddress', array('to'));
		throw new NotificationException($msg);
	}

	// return TRUE/FALSE to stop elgg_send_email() from sending
	$mail_params = array(
							'to' => $to,
							'from' => $from,
							'subject' => $subject,
							'body' => $body,
							'params' => $params
					);

	$result = elgg_trigger_plugin_hook('email', 'system', $mail_params, NULL);
	if ($result !== NULL) {
		return $result;
	}

	$header_eol = "\r\n";
	if (isset($CONFIG->broken_mta) && $CONFIG->broken_mta) {
		// Allow non-RFC 2822 mail headers to support some broken MTAs
		$header_eol = "\n";
	}

	// Windows is somewhat broken, so we use just address for to and from
	if (strtolower(substr(PHP_OS, 0, 3)) == 'win') {
		// strip name from to and from
		if (strpos($to, '<')) {
			preg_match('/<(.*)>/', $to, $matches);
			$to = $matches[1];
		}
		if (strpos($from, '<')) {
			preg_match('/<(.*)>/', $from, $matches);
			$from = $matches[1];
		}
	}

	$headers = "From: $from{$header_eol}"
		. "Content-Type: text/plain; charset=UTF-8; format=flowed{$header_eol}"
		. "MIME-Version: 1.0{$header_eol}"
		. "Content-Transfer-Encoding: 8bit{$header_eol}";


	// Sanitise subject by stripping line endings
	$subject = preg_replace("/(\r\n|\r|\n)/", " ", $subject);
	if (is_callable('mb_encode_mimeheader')) {
		$subject = mb_encode_mimeheader($subject, "UTF-8", "B");
	}

	// Format message
	$body = html_entity_decode($body, ENT_COMPAT, 'UTF-8'); // Decode any html entities
	$body = elgg_strip_tags($body); // Strip tags from message
	$body = preg_replace("/(\r\n|\r)/", "\n", $body); // Convert to unix line endings in body
	$body = preg_replace("/^From/", ">From", $body); // Change lines starting with From to >From

	return mail($to, $subject, wordwrap($body), $headers);
}

/**
 * Correctly initialise notifications and register the email handler.
 *
 * @return void
 */
function notification_init() {
	// Register a notification handler for the default email method
	register_notification_handler("email", "email_notify_handler");

	// Add settings view to user settings & register action
	elgg_extend_view('forms/account/settings', 'core/settings/account/notifications');

	elgg_register_plugin_hook_handler('usersettings:save', 'user', 'notification_user_settings_save');
}

/**
 * Includes the action to save user notifications
 *
 * @return void
 * @todo why can't this call action(...)?
 */
function notification_user_settings_save() {
	global $CONFIG;
	//@todo Wha??
	include($CONFIG->path . "actions/notifications/settings/usersettings/save.php");
}

/**
 * Register an entity type and subtype to be eligible for notifications
 *
 * @param string $entity_type    The type of entity
 * @param string $object_subtype Its subtype
 * @param string $language_name  Its localized notification string (eg "New blog post")
 *
 * @return void
 */
function register_notification_object($entity_type, $object_subtype, $language_name) {
	global $CONFIG;

	if ($entity_type == '') {
		$entity_type = '__BLANK__';
	}
	if ($object_subtype == '') {
		$object_subtype = '__BLANK__';
	}

	if (!isset($CONFIG->register_objects)) {
		$CONFIG->register_objects = array();
	}

	if (!isset($CONFIG->register_objects[$entity_type])) {
		$CONFIG->register_objects[$entity_type] = array();
	}

	$CONFIG->register_objects[$entity_type][$object_subtype] = $language_name;
}

/**
 * Establish a 'notify' relationship between the user and a content author
 *
 * @param int $user_guid   The GUID of the user who wants to follow a user's content
 * @param int $author_guid The GUID of the user whose content the user wants to follow
 *
 * @return true|false Depending on success
 */
function register_notification_interest($user_guid, $author_guid) {
	return add_entity_relationship($user_guid, 'notify', $author_guid);
}

/**
 * Remove a 'notify' relationship between the user and a content author
 *
 * @param int $user_guid   The GUID of the user who is following a user's content
 * @param int $author_guid The GUID of the user whose content the user wants to unfollow
 *
 * @return true|false Depending on success
 */
function remove_notification_interest($user_guid, $author_guid) {
	return remove_entity_relationship($user_guid, 'notify', $author_guid);
}

/**
 * Automatically triggered notification on 'create' events that looks at registered
 * objects and attempts to send notifications to anybody who's interested
 *
 * @see register_notification_object
 *
 * @param string $event       create
 * @param string $object_type mixed
 * @param mixed  $object      The object created
 *
 * @return void
 */
function object_notifications($event, $object_type, $object) {
	// We only want to trigger notification events for ElggEntities
	if ($object instanceof ElggEntity) {

		// Get config data
		global $CONFIG, $SESSION, $NOTIFICATION_HANDLERS;

		$hookresult = elgg_trigger_plugin_hook('object:notifications', $object_type, array(
			'event' => $event,
			'object_type' => $object_type,
			'object' => $object,
		), false);
		if ($hookresult === true) {
			return true;
		}

		// Have we registered notifications for this type of entity?
		$object_type = $object->getType();
		if (empty($object_type)) {
			$object_type = '__BLANK__';
		}

		$object_subtype = $object->getSubtype();
		if (empty($object_subtype)) {
			$object_subtype = '__BLANK__';
		}

		if (isset($CONFIG->register_objects[$object_type][$object_subtype])) {
			$descr = $CONFIG->register_objects[$object_type][$object_subtype];
			$string = $descr . ": " . $object->getURL();

			// Get users interested in content from this person and notify them
			// (Person defined by container_guid so we can also subscribe to groups if we want)
			foreach ($NOTIFICATION_HANDLERS as $method => $foo) {
				$interested_users = elgg_get_entities_from_relationship(array(
					'relationship' => 'notify' . $method,
					'relationship_guid' => $object->container_guid,
					'inverse_relationship' => TRUE,
					'types' => 'user',
					'limit' => 99999
				));

				if ($interested_users && is_array($interested_users)) {
					foreach ($interested_users as $user) {
						if ($user instanceof ElggUser && !$user->isBanned()) {
							if (($user->guid != $SESSION['user']->guid) && has_access_to_entity($object, $user)
							&& $object->access_id != ACCESS_PRIVATE) {
								$methodstring = elgg_trigger_plugin_hook('notify:entity:message', $object->getType(), array(
									'entity' => $object,
									'to_entity' => $user,
									'method' => $method), $string);
								if (empty($methodstring) && $methodstring !== false) {
									$methodstring = $string;
								}
								if ($methodstring !== false) {
									notify_user($user->guid, $object->container_guid, $descr, $methodstring,
										NULL, array($method));
								}
							}
						}
					}
				}
			}
		}
	}
}

// Register a startup event
elgg_register_event_handler('init', 'system', 'notification_init', 0);
elgg_register_event_handler('create', 'object', 'object_notifications');