aboutsummaryrefslogtreecommitdiff
path: root/engine/lib/system_log.php
blob: 8816e24c3ca1b1adeecee28cbe336f2249904fbf (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
<?php
/**
 * Elgg system log.
 * Listens to events and writes crud events into the system log database.
 *
 * @package Elgg
 * @subpackage Core
 */

/**
 * Retrieve the system log based on a number of parameters.
 *
 * @param int or array $by_user The guid(s) of the user(s) who initiated the event.
 * @param string $event The event you are searching on.
 * @param string $class The class of object it effects.
 * @param string $type The type
 * @param string $subtype The subtype.
 * @param int $limit Maximum number of responses to return.
 * @param int $offset Offset of where to start.
 * @param bool $count Return count or not
 */
function get_system_log($by_user = "", $event = "", $class = "", $type = "", $subtype = "", $limit = 10, $offset = 0, $count = false, $timebefore = 0, $timeafter = 0, $object_id = 0) {
	global $CONFIG;

	$by_user_orig = $by_user;
	if (is_array($by_user) && sizeof($by_user) > 0) {
		foreach($by_user as $key => $val) {
			$by_user[$key] = (int) $val;
		}
	} else {
		$by_user = (int)$by_user;
	}
	$event = sanitise_string($event);
	$class = sanitise_string($class);
	$type = sanitise_string($type);
	$subtype = sanitise_string($subtype);
	$limit = (int)$limit;
	$offset = (int)$offset;

	$where = array();

	if ($by_user_orig!=="") {
		if (is_int($by_user)) {
			$where[] = "performed_by_guid=$by_user";
		} else if (is_array($by_user)) {
			$where [] = "performed_by_guid in (". implode(",",$by_user) .")";
		}
	}
	if ($event != "") {
		$where[] = "event='$event'";
	}
	if ($class!=="") {
		$where[] = "object_class='$class'";
	}
	if ($type != "") {
		$where[] = "object_type='$type'";
	}
	if ($subtype!=="") {
		$where[] = "object_subtype='$subtype'";
	}

	if ($timebefore) {
		$where[] = "time_created < " . ((int) $timebefore);
	}
	if ($timeafter) {
		$where[] = "time_created > " . ((int) $timeafter);
	}
	if ($object_id) {
		$where[] = "object_id = " . ((int) $object_id);
	}

	$select = "*";
	if ($count) {
		$select = "count(*) as count";
	}
	$query = "SELECT $select from {$CONFIG->dbprefix}system_log where 1 ";
	foreach ($where as $w) {
		$query .= " and $w";
	}

	if (!$count) {
		$query .= " order by time_created desc";
		$query .= " limit $offset, $limit"; // Add order and limit
	}

	if ($count) {
		if ($numrows = get_data_row($query)) {
			return $numrows->count;
		}
	} else {
		return get_data($query);
	}

	return false;
}

/**
 * Return a specific log entry.
 *
 * @param int $entry_id The log entry
 */
function get_log_entry($entry_id) {
	global $CONFIG;

	$entry_id = (int)$entry_id;

	return get_data_row("SELECT * from {$CONFIG->dbprefix}system_log where id=$entry_id");
}

/**
 * Return the object referred to by a given log entry
 *
 * @param int $entry_id The log entry
 */
function get_object_from_log_entry($entry_id) {
	$entry = get_log_entry($entry_id);

	if ($entry) {
		$class = $entry->object_class;
		$tmp = new $class();
		$object = $tmp->getObjectFromID($entry->object_id);

		if ($object) {
			return $object;
		}
	}

	return false;
}

/**
 * Log a system event related to a specific object.
 *
 * This is called by the event system and should not be called directly.
 *
 * @param $object The object you're talking about.
 * @param $event String The event being logged
 */
function system_log($object, $event) {
	global $CONFIG;
	static $logcache;

	if ($object instanceof Loggable) {
		if (!is_array($logcache)) {
			$logcache = array();
		}

		// Has loggable interface, extract the necessary information and store
		$object_id = (int)$object->getSystemLogID();
		$object_class = $object->getClassName();
		$object_type = $object->getType();
		$object_subtype = $object->getSubtype();
		$event = sanitise_string($event);
		$time = time();
		$performed_by = get_loggedin_userid();

		if (isset($object->access_id)) {
			$access_id = $object->access_id;
		} else {
			$access_id = ACCESS_PUBLIC;
		}
		if (isset($object->enabled)) {
			$enabled = $object->enabled;
		} else {
			$enabled = 'yes';
		}

		if (isset($object->owner_guid)) {
			$owner_guid = $object->owner_guid;
		} else {
			$owner_guid = 0;
		}

		// Create log if we haven't already created it
		if (!isset($logcache[$time][$object_id][$event])) {
			insert_data("INSERT DELAYED into {$CONFIG->dbprefix}system_log (object_id, object_class, object_type, object_subtype, event, performed_by_guid, owner_guid, access_id, enabled, time_created) VALUES ('$object_id','$object_class','$object_type', '$object_subtype', '$event',$performed_by, $owner_guid, $access_id, '$enabled', '$time')");

			$logcache[$time][$object_id][$event] = true;
		}

		return true;
	}
}

/**
 * This function creates an archive copy of the system log.
 *
 * @param int $offset An offset in seconds from now to archive (useful for log rotation)
 */
function archive_log($offset = 0) {
	global $CONFIG;

	$offset = (int)$offset;
	$now = time(); // Take a snapshot of now

	$ts = $now - $offset;

	// create table
	if (!update_data("CREATE TABLE {$CONFIG->dbprefix}system_log_$now as SELECT * from {$CONFIG->dbprefix}system_log WHERE time_created<$ts")) {
		return false;
	}

	// delete
	// Don't delete on time since we are running in a concurrent environment
	if (delete_data("DELETE from {$CONFIG->dbprefix}system_log WHERE time_created<$ts") === false) {
		return false;
	}

	// alter table to engine
	if (!update_data("ALTER TABLE {$CONFIG->dbprefix}system_log_$now engine=archive")) {
		return false;
	}

	return true;
}

/**
 * Default system log handler, allows plugins to override, extend or disable logging.
 *
 * @param string $event
 * @param string $object_type
 * @param Loggable $object
 * @return unknown
 */
function system_log_default_logger($event, $object_type, $object) {
	system_log($object['object'], $object['event']);

	return true;
}

/**
 * System log listener.
 * This function listens to all events in the system and logs anything appropriate.
 *
 * @param String $event
 * @param String $object_type
 * @param Loggable $object
 */
function system_log_listener($event, $object_type, $object) {
	if (($object_type!='systemlog') && ($event!='log')) {
		trigger_elgg_event('log', 'systemlog', array('object' => $object, 'event' => $event));
	}

	return true;
}

/** Register event to listen to all events **/
register_elgg_event_handler('all','all','system_log_listener', 400);

/** Register a default system log handler */
register_elgg_event_handler('log','systemlog','system_log_default_logger', 999);