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
|
<?php
/**
* Elgg access permissions
* For users, objects, collections and all metadata
*
* @package Elgg
* @subpackage Core
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
* @author Curverider Ltd
* @copyright Curverider Ltd 2008
* @link http://elgg.org/
*/
/**
* Get the list of access restrictions the given user is allowed to see on this site
*
* @uses get_access_array
* @param int $user_id User ID; defaults to currently logged in user
* @param int $site_id Site ID; defaults to current site
* @param boolean $flush If set to true, will refresh the access list from the database
* @return string A list of access groups suitable for injection in an SQL call
*/
function get_access_list($user_id = 0, $site_id = 0, $flush = false) {
global $CONFIG;
static $access_list;
if (!isset($access_list))
$access_list = array();
if ($user_id == 0) $user_id = $_SESSION['id'];
if (($site_id == 0) && (isset($CONFIG->site_id))) $site_id = $CONFIG->site_id;
$user_id = (int) $user_id;
$site_id = (int) $site_id;
if (empty($access_list[$user_id]) || $flush == true) {
$access_list[$user_id] = "(" . implode(",",get_access_array($user_id, $site_id, $flush)) . ")";
}
return $access_list[$user_id];
}
/**
* Gets an array of access restrictions the given user is allowed to see on this site
*
* @param int $user_id User ID; defaults to currently logged in user
* @param int $site_id Site ID; defaults to current site
* @param boolean $flush If set to true, will refresh the access list from the database
* @return array An array of access groups suitable for injection in an SQL call
*/
function get_access_array($user_id = 0, $site_id = 0, $flush = false) {
global $CONFIG;
static $access_array;
if (!isset($access_array))
$access_array = array();
if ($user_id == 0) $user_id = $_SESSION['guid'];
if (($site_id == 0) && (isset($CONFIG->site_id))) $site_id = $CONFIG->site_id;
$user_id = (int) $user_id;
$site_id = (int) $site_id;
if (empty($access_array[$user_id]) || $flush == true) {
$query = "select am.access_group_id from {$CONFIG->dbprefix}access_group_membership am ";
$query .= " left join {$CONFIG->dbprefix}access_groups ag on ag.id = am.access_group_id ";
$query .= " where am.user_guid = {$user_id} and (ag.site_guid = {$site_id} or ag.site_guid = 0)";
$tmp_access_array = array(2);
if (isloggedin())
$tmp_access_array[] = 1;
if ($groups = get_data($query)) {
foreach($groups as $group)
$tmp_access_array[] = $group->access_group_id;
}
$access_array[$user_id] = $tmp_access_array;
}
return $access_array[$user_id];
}
/**
* Add access restriction sql code to a given query.
*
* Note that if this code is executed in privileged mode it will return blank.
*
* TODO: DELETE once Query classes are fully integrated
*
* @param string $table_prefix Optional xxx. prefix for the access code.
*/
function get_access_sql_suffix($table_prefix = "")
{
$sql = "";
if ($table_prefix)
$table_prefix = sanitise_string($table_prefix) . ".";
//if (!is_privileged())
//{
$access = get_access_list();
$sql = " ({$table_prefix}access_id in {$access} or ({$table_prefix}access_id = 0 and {$table_prefix}owner_guid = {$_SESSION['id']}))";
//}
//else
// $sql = " 1 ";
// Only return 'active' objects
$sql .= " and {$table_prefix}enabled='yes'";
return $sql;
}
/**
* Returns an array of access permissions that the specified user is allowed to save objects with.
* Permissions are of the form ('id' => 'Description')
*
* @param int $user_id The user's GUID.
* @param int $site_id The current site.
* @param true|false $flush If this is set to true, this will shun any cached version
* @return array List of access permissions=
*/
function get_write_access_array($user_id = 0, $site_id = 0, $flush = false) {
global $CONFIG;
static $access_array;
if ($user_id == 0) $user_id = $_SESSION['guid'];
if (($site_id == 0) && (isset($CONFIG->site_id))) $site_id = $CONFIG->site_id;
$user_id = (int) $user_id;
$site_id = (int) $site_id;
if (empty($access_array[$user_id]) || $flush == true) {
$query = "select ag.* from {$CONFIG->dbprefix}access_groups ag ";
$query .= " where (ag.site_guid = {$site_id} or ag.site_guid = 0)";
$query .= " and (ag.owner_guid = {$user_id} or ag.owner_guid = 0)";
$tmp_access_array = array();
if ($groups = get_data($query)) {
foreach($groups as $group)
$tmp_access_array[$group->id] = elgg_echo($group->name);
}
$tmp_access_array = trigger_plugin_hook('access','user',array('user_id' => $user_id, 'site_id' => $site_id),$tmp_access_array);
$access_array[$user_id] = $tmp_access_array;
}
return $access_array[$user_id];
}
/**
* Creates a new access control group owned by the specified user.
*
* @param string $name The name of the group.
* @param int $owner_guid The GUID of the owner (default: currently logged in user).
* @param int $site_guid The GUID of the site (default: current site).
* @return int|false Depending on success (the group ID if successful).
*/
function create_access_group($name, $owner_guid = 0, $site_guid = 0) {
$name = trim($name);
if (empty($name)) return false;
if ($user_id == 0) $user_id = $_SESSION['id'];
if (($site_id == 0) && (isset($CONFIG->site_id))) $site_id = $CONFIG->site_id;
$name = sanitise_string($name);
global $CONFIG;
return insert_data("insert into {$CONFIG->dbprefix}access_groups set name = '{$name}', owner_guid = {$owner_guid}, site_guid = {$site_guid}");
}
/**
* Deletes a specified access group
*
* @param int $group_id The group ID
* @return true|false Depending on success
*/
function delete_access_group($group_id) {
$group_id = (int) $group_id;
$groups = get_write_access_array();
if (in_array($group_id,$groups)) {
global $CONFIG;
delete_data("delete from {$CONFIG->dbprefix}access_group_membership where access_group_id = {$group_id}");
delete_data("delete from {$CONFIG->dbprefix}access_groups where id = {$group_id}");
return true;
} else {
return false;
}
}
/**
* Adds a user to the specified user group
*
* @param int $user_guid The GUID of the user to add
* @param int $group_id The ID of the group to add them to
* @return true|false Depending on success
*/
function add_user_to_access_group($user_guid, $group_id) {
$group_id = (int) $group_id;
$user_guid = (int) $user_guid;
$groups = get_write_access_array();
if (in_array($group_id, $groups) && $user = get_user($user_guid)) {
global $CONFIG;
insert_data("insert into {$CONFIG->dbprefix}access_group_membership set access_group_id = {$group_id}, user_guid = {$user_guid}");
return true;
}
return false;
}
/**
* Removes a user from an access group
*
* @param int $user_guid The user GUID
* @param int $group_id The access group ID
* @return true|false Depending on success
*/
function remove_user_from_access_group($user_guid, $group_id) {
$group_id = (int) $group_id;
$user_guid = (int) $user_guid;
$groups = get_write_access_array();
if (in_array($group_id, $groups) && $user = get_user($user_guid)) {
global $CONFIG;
delete_data("delete from {$CONFIG->dbprefix}access_group_membership where access_group_id = {$group_id} and user_guid = {$user_guid}");
return true;
}
return false;
}
/**
* Some useful constant definitions
*/
define('ACCESS_PRIVATE',0);
define('ACCESS_LOGGED_IN',1);
define('ACCESS_PUBLIC',2);
?>
|
