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
|
<?php
/**
* Elgg system log.
* Listens to events and writes crud events into the system log database.
*
* @package Elgg
* @subpackage Core
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
* @author Marcus Povey
* @copyright Curverider Ltd 2008
* @link http://elgg.org/
*/
/**
* Interface that provides an interface which must be implemented by all objects wishing to be
* recorded in the system log (and by extension the river).
*
* This interface defines a set of methods that permit the system log functions to hook in and retrieve
* the necessary information and to identify what events can actually be logged.
*
* To have events involving your object to be logged simply implement this interface.
*
* @author Marcus Povey
*/
interface Loggable
{
/**
* Return an identification for the object for storage in the system log.
* This id must be an integer.
*
* @return int
*/
public function getSystemLogID();
/**
* Return the class name of the object.
* Added as a function because get_class causes errors for some reason.
*/
public function getClassName();
/**
* For a given ID, return the object associated with it.
* This is used by the river functionality primarily.
* This is useful for checking access permissions etc on objects.
*/
public function getObjectFromID($id);
/**
* Return the GUID of the owner of this object.
*/
public function getObjectOwnerGUID();
}
/**
* Retrieve the system log based on a number of parameters.
*
* @param int $by_user The user who initiated the event.
* @param string $event The event you are searching on.
* @param string $class The class of object it effects.
* @param int $limit Maximum number of responses to return.
* @param int $offset Offset of where to start.
*/
function get_system_log($by_user = "", $event = "", $class = "", $limit = 10, $offset = 0)
{
global $CONFIG;
if (is_array($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);
$limit = (int)$limit;
$offset = (int)$offset;
$where = array();
if (is_int($by_user) && $by_user > 0) {
$where[] = "performed_by_guid=$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'";
$query = "SELECT * from {$CONFIG->dbprefix}system_log where 1 ";
foreach ($where as $w)
$query .= " and $w";
$query .= " order by time_created desc";
$query .= " limit $offset, $limit"; // Add order and limit
return get_data($query);
}
/**
* 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();
$event = sanitise_string($event);
$time = time();
$performed_by = (int)$_SESSION['guid'];
// Create log if we haven't already created it
if (!isset($logcache[$time][$object_id][$event])) {
if (insert_data("INSERT into {$CONFIG->dbprefix}system_log (object_id, object_class, event, performed_by_guid, time_created) VALUES ('$object_id','$object_class','$event',$performed_by, '$time')")) {
$logcache[$time][$object_id][$event] = true;
return true;
}
return false;
}
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 mixed $object
*/
function system_log_listener($event, $object_type, $object)
{
system_log($object, $event);
return true;
}
/** Register event to listen to all events **/
register_elgg_event_handler('all','all','system_log_listener', 400);
?>
|
