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
|
<?php
/**
+-----------------------------------------------------------------------+
| This file is part of the Roundcube Webmail client |
| |
| Copyright (C) The Roundcube Dev Team |
| Copyright (C) Kolab Systems AG |
| |
| Licensed under the GNU General Public License version 3 or |
| any later version with exceptions for skins & plugins. |
| See the README file for a full license statement. |
| |
| PURPOSE: |
| Provide database supported session management |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
| Author: Aleksander Machniak <alec@alec.pl> |
| Author: Cor Bosman <cor@roundcu.be> |
+-----------------------------------------------------------------------+
*/
/**
* Class to provide database session storage
*
* @package Framework
* @subpackage Core
*/
class rcube_session_db extends rcube_session
{
/** @var rcube_db Database handler */
private $db;
/** @var string Session table name (quoted) */
private $table_name;
/**
* Object constructor
*
* @param rcube_config $config Configuration
*/
public function __construct($config)
{
parent::__construct($config);
// get db instance
$this->db = rcube::get_instance()->get_dbh();
// session table name
$this->table_name = $this->db->table_name('session', true);
// register sessions handler
$this->register_session_handler();
// register db gc handler
$this->register_gc_handler([$this, 'gc_db']);
}
/**
* Opens the session
*
* @param string $save_path Session save path
* @param string $session_name Session name
*
* @return bool True on success, False on failure
*/
public function open($save_path, $session_name)
{
return true;
}
/**
* Close the session
*
* @return bool True on success, False on failure
*/
public function close()
{
return true;
}
/**
* Destroy the session
*
* @param string $key Session identifier
*
* @return bool True on success, False on failure
*/
public function destroy($key)
{
if ($key) {
$this->db->query("DELETE FROM {$this->table_name} WHERE `sess_id` = ?", $key);
}
return true;
}
/**
* Read session data from database
*
* @param string $key Session identifier
*
* @return string Session vars (serialized string)
*/
public function read($key)
{
if ($this->lifetime) {
$expire_time = $this->db->now(-$this->lifetime);
$expire_check = "CASE WHEN `changed` < $expire_time THEN 1 ELSE 0 END AS expired";
}
$sql_result = $this->db->query(
"SELECT `vars`, `ip`, `changed`, " . $this->db->now() . " AS ts"
. (isset($expire_check) ? ", $expire_check" : '')
. " FROM {$this->table_name} WHERE `sess_id` = ?", $key
);
if ($sql_result && ($sql_arr = $this->db->fetch_assoc($sql_result))) {
// Remove expired sessions (we use gc, but it may not be precise enough or disabled)
if (!empty($sql_arr['expired'])) {
$this->destroy($key);
return '';
}
$time_diff = time() - strtotime($sql_arr['ts']);
$this->changed = strtotime($sql_arr['changed']) + $time_diff; // local (PHP) time
$this->ip = $sql_arr['ip'];
$this->vars = base64_decode($sql_arr['vars']);
$this->key = $key;
$this->db->reset();
return !empty($this->vars) ? (string) $this->vars : '';
}
return '';
}
/**
* Insert new data into db session store
*
* @param string $key Session identifier
* @param string $vars Serialized data string
*
* @return bool True on success, False on failure
*/
public function write($key, $vars)
{
if ($this->ignore_write) {
return true;
}
$now = $this->db->now();
$this->db->query("INSERT INTO {$this->table_name}"
. " (`sess_id`, `vars`, `ip`, `changed`)"
. " VALUES (?, ?, ?, $now)",
$key, base64_encode($vars), (string)$this->ip
);
return true;
}
/**
* Update session data
*
* @param string $key Session identifier
* @param string $newvars New session data string
* @param string $oldvars Old session data string
*
* @return bool True on success, False on failure
*/
public function update($key, $newvars, $oldvars)
{
$now = $this->db->now();
$ts = microtime(true);
// if new and old data are not the same, update data
// else update expire timestamp only when certain conditions are met
if ($newvars !== $oldvars) {
$this->db->query("UPDATE {$this->table_name} "
. "SET `changed` = $now, `vars` = ? WHERE `sess_id` = ?",
base64_encode($newvars), $key);
}
else if ($ts - $this->changed > $this->lifetime / 2) {
$this->db->query("UPDATE {$this->table_name} SET `changed` = $now"
. " WHERE `sess_id` = ?", $key);
}
return true;
}
/**
* Clean up db sessions.
*/
public function gc_db()
{
// just clean all old sessions when this GC is called
$this->db->query("DELETE FROM " . $this->db->table_name('session')
. " WHERE `changed` < " . $this->db->now(-$this->gc_enabled));
$this->log("Session GC (DB): remove records < "
. date('Y-m-d H:i:s', time() - $this->gc_enabled)
. '; rows = ' . intval($this->db->affected_rows()));
}
}
|
