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trac750 Remove foreign link when Facebook user removes our app
[quix0rs-gnu-social.git] / actions / facebookremove.php
1 <?php
2 /*
3  * Laconica - a distributed open-source microblogging tool
4  * Copyright (C) 2008, Controlez-Vous, Inc.
5  *
6  * This program is free software: you can redistribute it and/or modify
7  * it under the terms of the GNU Affero General Public License as published by
8  * the Free Software Foundation, either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU Affero General Public License for more details.
15  *
16  * You should have received a copy of the GNU Affero General Public License
17  * along with this program.      If not, see <http://www.gnu.org/licenses/>.
18  */
19
20 if (!defined('LACONICA')) { exit(1); }
21
22 require_once(INSTALLDIR.'/lib/facebookaction.php');
23
24 class FacebookremoveAction extends FacebookAction {
25
26         function handle($args) {
27                 parent::handle($args);
28
29                 $secret = common_config('facebook', 'secret');
30
31                 $sig = '';
32
33                 ksort($_POST);
34
35                 foreach ($_POST as $key => $val) {
36                         if (substr($key, 0, 7) == 'fb_sig_') {
37                                 $sig .= substr($key, 7) . '=' . $val;
38                         }
39                  }
40
41                 $sig .= $secret;
42                 $verify = md5($sig);
43
44                 if ($verify == $this->arg('fb_sig')) {
45
46                         $flink = Foreign_link::getByForeignID($this->arg('fb_sig_user'), 2);
47
48                         common_debug("Removing foreign link to Facebook - local user ID: $flink->user_id, Facebook ID: $flink->foreign_id");
49
50                         $result = $flink->delete();
51
52                         if (!$result) {
53                                 common_log_db_error($flink, 'DELETE', __FILE__);
54                                 common_server_error(_('Couldn\'t remove Facebook user.'));
55                                 return;
56                         }
57
58                 } else {
59                         # Someone bad tried to remove facebook link?
60                         common_log(LOG_ERR, "Someone from $_SERVER[REMOTE_ADDR] " .
61                                 'unsuccessfully tried to remove a foreign link to Facebook!');
62                 }
63         }
64
65 }