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[friendica.git] / src / Core / Session / DatabaseSessionHandler.php
1 <?php
2
3 namespace Friendica\Core\Session;
4
5 use Friendica\BaseObject;
6 use Friendica\Core\Logger;
7 use Friendica\Core\Session;
8 use Friendica\Database\DBA;
9 use SessionHandlerInterface;
10
11 /**
12  * SessionHandler using database
13  *
14  * @author Hypolite Petovan <hypolite@mrpetovan.com>
15  */
16 class DatabaseSessionHandler extends BaseObject implements SessionHandlerInterface
17 {
18         public function open($save_path, $session_name)
19         {
20                 return true;
21         }
22
23         public function read($session_id)
24         {
25                 if (empty($session_id)) {
26                         return '';
27                 }
28
29                 $session = DBA::selectFirst('session', ['data'], ['sid' => $session_id]);
30                 if (DBA::isResult($session)) {
31                         Session::$exists = true;
32                         return $session['data'];
33                 }
34                 Logger::log("no data for session $session_id", Logger::TRACE);
35
36                 return '';
37         }
38
39         /**
40          * @brief Standard PHP session write callback
41          *
42          * This callback updates the DB-stored session data and/or the expiration depending
43          * on the case. Uses the Session::expire global for existing session, 5 minutes
44          * for newly created session.
45          *
46          * @param  string $session_id   Session ID with format: [a-z0-9]{26}
47          * @param  string $session_data Serialized session data
48          * @return boolean Returns false if parameters are missing, true otherwise
49          */
50         public function write($session_id, $session_data)
51         {
52                 if (!$session_id) {
53                         return false;
54                 }
55
56                 if (!$session_data) {
57                         return true;
58                 }
59
60                 $expire = time() + Session::$expire;
61                 $default_expire = time() + 300;
62
63                 if (Session::$exists) {
64                         $fields = ['data' => $session_data, 'expire' => $expire];
65                         $condition = ["`sid` = ? AND (`data` != ? OR `expire` != ?)", $session_id, $session_data, $expire];
66                         DBA::update('session', $fields, $condition);
67                 } else {
68                         $fields = ['sid' => $session_id, 'expire' => $default_expire, 'data' => $session_data];
69                         DBA::insert('session', $fields);
70                 }
71
72                 return true;
73         }
74
75         public function close()
76         {
77                 return true;
78         }
79
80         public function destroy($id)
81         {
82                 DBA::delete('session', ['sid' => $id]);
83                 return true;
84         }
85
86         public function gc($maxlifetime)
87         {
88                 DBA::delete('session', ["`expire` < ?", time()]);
89                 return true;
90         }
91 }