| commit | author | age | ||
| 929a50 | 1 | <?php |
| A | 2 | |
| 3 | /* | |
| 4 | +-----------------------------------------------------------------------+ | |
| 5 | | program/include/rcube_session.php | | |
| 6 | | | | |
| 7 | | This file is part of the RoundCube Webmail client | | |
| 8 | | Copyright (C) 2005-2009, RoundCube Dev. - Switzerland | | |
| 9 | | Licensed under the GNU GPL | | |
| 10 | | | | |
| 11 | | PURPOSE: | | |
| 12 | | Provide database supported session management | | |
| 13 | | | | |
| 14 | +-----------------------------------------------------------------------+ | |
| 15 | | Author: Thomas Bruederli <roundcube@gmail.com> | | |
| 16 | | Author: Aleksander Machniak <alec@alec.pl> | | |
| 17 | +-----------------------------------------------------------------------+ | |
| 18 | ||
| 19 | $Id: session.inc 2932 2009-09-07 12:51:21Z alec $ | |
| 20 | ||
| 21 | */ | |
| 22 | ||
| 23 | class rcube_session | |
| 24 | { | |
| 25 | private $db; | |
| 26 | private $ip; | |
| 27 | private $changed; | |
| 28 | private $unsets = array(); | |
| 29 | private $gc_handlers = array(); | |
| 30 | private $start; | |
| 31 | private $vars = false; | |
| 32 | private $key; | |
| 33 | private $keep_alive = 0; | |
| 34 | ||
| 35 | /** | |
| 36 | * Default constructor | |
| 37 | */ | |
| 38 | public function __construct($db, $lifetime=60) | |
| 39 | { | |
| 40 | $this->db = $db; | |
| 41 | $this->lifetime = $lifetime; | |
| 42 | $this->start = microtime(true); | |
| 43 | ||
| 44 | // set custom functions for PHP session management | |
| 45 | session_set_save_handler( | |
| 46 | array($this, 'open'), | |
| 47 | array($this, 'close'), | |
| 48 | array($this, 'read'), | |
| 49 | array($this, 'write'), | |
| 50 | array($this, 'destroy'), | |
| 51 | array($this, 'gc')); | |
| 52 | } | |
| 53 | ||
| 54 | ||
| 55 | public function open($save_path, $session_name) | |
| 56 | { | |
| 57 | return true; | |
| 58 | } | |
| 59 | ||
| 60 | ||
| 61 | public function close() | |
| 62 | { | |
| 63 | return true; | |
| 64 | } | |
| 65 | ||
| 66 | ||
| 67 | // read session data | |
| 68 | public function read($key) | |
| 69 | { | |
| 70 | $sql_result = $this->db->query( | |
| 71 | sprintf("SELECT vars, ip, %s AS changed FROM %s WHERE sess_id = ?", | |
| 72 | $this->db->unixtimestamp('changed'), get_table_name('session')), | |
| 73 | $key); | |
| 74 | ||
| 75 | if ($sql_arr = $this->db->fetch_assoc($sql_result)) { | |
| 76 | $this->changed = $sql_arr['changed']; | |
| 77 | $this->vars = $sql_arr['vars']; | |
| 78 | $this->ip = $sql_arr['ip']; | |
| 79 | $this->key = $key; | |
| 80 | ||
| 81 | if (!empty($sql_arr['vars'])) | |
| 82 | return $sql_arr['vars']; | |
| 83 | } | |
| 84 | ||
| 85 | return false; | |
| 86 | } | |
| 87 | ||
| 88 | ||
| 89 | // save session data | |
| 90 | public function write($key, $vars) | |
| 91 | { | |
| 92 | $ts = microtime(true); | |
| 93 | $now = $this->db->fromunixtime((int)$ts); | |
| 94 | ||
| 95 | // use internal data from read() for fast requests (up to 0.5 sec.) | |
| 96 | if ($key == $this->key && $ts - $this->start < 0.5) { | |
| 97 | $oldvars = $this->vars; | |
| 98 | } else { // else read data again from DB | |
| 99 | $oldvars = $this->read($key); | |
| 100 | } | |
| 101 | ||
| 102 | if ($oldvars !== false) { | |
| 103 | $a_oldvars = $this->unserialize($oldvars); | |
| 104 | foreach ((array)$this->unsets as $k) | |
| 105 | unset($a_oldvars[$k]); | |
| 106 | ||
| 107 | $newvars = $this->serialize(array_merge( | |
| 108 | (array)$a_oldvars, (array)$this->unserialize($vars))); | |
| 109 | ||
| 110 | if ($this->keep_alive>0) { | |
| 111 | $timeout = min($this->lifetime * 0.5, | |
| 112 | $this->lifetime - $this->keep_alive); | |
| 113 | } else { | |
| 114 | $timeout = 0; | |
| 115 | } | |
| 116 | ||
| 117 | if (!($newvars === $oldvars) || ($ts - $this->changed > $timeout)) { | |
| 118 | $this->db->query( | |
| 119 | sprintf("UPDATE %s SET vars = ?, changed = %s WHERE sess_id = ?", | |
| 120 | get_table_name('session'), $now), | |
| 121 | $newvars, $key); | |
| 122 | } | |
| 123 | } | |
| 124 | else { | |
| 125 | $this->db->query( | |
| 126 | sprintf("INSERT INTO %s (sess_id, vars, ip, created, changed) ". | |
| 127 | "VALUES (?, ?, ?, %s, %s)", | |
| 128 | get_table_name('session'), $now, $now), | |
| 129 | $key, $vars, (string)$_SERVER['REMOTE_ADDR']); | |
| 130 | } | |
| 131 | ||
| 132 | $this->unsets = array(); | |
| 133 | return true; | |
| 134 | } | |
| 135 | ||
| 136 | ||
| 137 | // handler for session_destroy() | |
| 138 | public function destroy($key) | |
| 139 | { | |
| 140 | $this->db->query( | |
| 141 | sprintf("DELETE FROM %s WHERE sess_id = ?", get_table_name('session')), | |
| 142 | $key); | |
| 143 | ||
| 144 | return true; | |
| 145 | } | |
| 146 | ||
| 147 | ||
| 148 | // garbage collecting function | |
| 149 | public function gc($maxlifetime) | |
| 150 | { | |
| 151 | // just delete all expired sessions | |
| 152 | $this->db->query( | |
| 153 | sprintf("DELETE FROM %s WHERE changed < %s", | |
| 154 | get_table_name('session'), $this->db->fromunixtime(time() - $maxlifetime))); | |
| 155 | ||
| 156 | foreach ($this->gc_handlers as $fct) | |
| 157 | $fct(); | |
| 158 | ||
| 159 | return true; | |
| 160 | } | |
| 161 | ||
| 162 | ||
| 163 | // registering additional garbage collector functions | |
| 164 | public function register_gc_handler($func_name) | |
| 165 | { | |
| 166 | if ($func_name && !in_array($func_name, $this->gc_handlers)) | |
| 167 | $this->gc_handlers[] = $func_name; | |
| 168 | } | |
| 169 | ||
| 170 | ||
| 171 | public function regenerate_id() | |
| 172 | { | |
| 173 | $randval = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; | |
| 174 | ||
| 175 | for ($random = '', $i=1; $i <= 32; $i++) { | |
| 176 | $random .= substr($randval, mt_rand(0,(strlen($randval) - 1)), 1); | |
| 177 | } | |
| 178 | ||
| 179 | // use md5 value for id or remove capitals from string $randval | |
| 180 | $random = md5($random); | |
| 181 | ||
| 182 | // delete old session record | |
| 183 | $this->destroy(session_id()); | |
| 184 | ||
| 185 | session_id($random); | |
| 186 | ||
| 187 | $cookie = session_get_cookie_params(); | |
| 188 | $lifetime = $cookie['lifetime'] ? time() + $cookie['lifetime'] : 0; | |
| 189 | ||
| 190 | rcmail::setcookie(session_name(), $random, $lifetime); | |
| 191 | ||
| 192 | return true; | |
| 193 | } | |
| 194 | ||
| 195 | ||
| 196 | // unset session variable | |
| 197 | public function remove($var=NULL) | |
| 198 | { | |
| 199 | if (empty($var)) | |
| 200 | return $this->destroy(session_id()); | |
| 201 | ||
| 202 | $this->unsets[] = $var; | |
| 203 | unset($_SESSION[$var]); | |
| 204 | ||
| 205 | return true; | |
| 206 | } | |
| 207 | ||
| 208 | ||
| 209 | // serialize session data | |
| 210 | private function serialize($vars) | |
| 211 | { | |
| 212 | $data = ''; | |
| 213 | if (is_array($vars)) | |
| 214 | foreach ($vars as $var=>$value) | |
| 215 | $data .= $var.'|'.serialize($value); | |
| 216 | else | |
| 217 | $data = 'b:0;'; | |
| 218 | return $data; | |
| 219 | } | |
| 220 | ||
| 221 | ||
| 222 | // unserialize session data | |
| 223 | // http://www.php.net/manual/en/function.session-decode.php#56106 | |
| 224 | private function unserialize($str) | |
| 225 | { | |
| 226 | $str = (string)$str; | |
| 227 | $endptr = strlen($str); | |
| 228 | $p = 0; | |
| 229 | ||
| 230 | $serialized = ''; | |
| 231 | $items = 0; | |
| 232 | $level = 0; | |
| 233 | ||
| 234 | while ($p < $endptr) { | |
| 235 | $q = $p; | |
| 236 | while ($str[$q] != '|') | |
| 237 | if (++$q >= $endptr) break 2; | |
| 238 | ||
| 239 | if ($str[$p] == '!') { | |
| 240 | $p++; | |
| 241 | $has_value = false; | |
| 242 | } else { | |
| 243 | $has_value = true; | |
| 244 | } | |
| 245 | ||
| 246 | $name = substr($str, $p, $q - $p); | |
| 247 | $q++; | |
| 248 | ||
| 249 | $serialized .= 's:' . strlen($name) . ':"' . $name . '";'; | |
| 250 | ||
| 251 | if ($has_value) { | |
| 252 | for (;;) { | |
| 253 | $p = $q; | |
| 254 | switch (strtolower($str[$q])) { | |
| 255 | case 'n': /* null */ | |
| 256 | case 'b': /* boolean */ | |
| 257 | case 'i': /* integer */ | |
| 258 | case 'd': /* decimal */ | |
| 259 | do $q++; | |
| 260 | while ( ($q < $endptr) && ($str[$q] != ';') ); | |
| 261 | $q++; | |
| 262 | $serialized .= substr($str, $p, $q - $p); | |
| 263 | if ($level == 0) break 2; | |
| 264 | break; | |
| 265 | case 'r': /* reference */ | |
| 266 | $q+= 2; | |
| 267 | for ($id = ''; ($q < $endptr) && ($str[$q] != ';'); $q++) $id .= $str[$q]; | |
| 268 | $q++; | |
| 269 | $serialized .= 'R:' . ($id + 1) . ';'; /* increment pointer because of outer array */ | |
| 270 | if ($level == 0) break 2; | |
| 271 | break; | |
| 272 | case 's': /* string */ | |
| 273 | $q+=2; | |
| 274 | for ($length=''; ($q < $endptr) && ($str[$q] != ':'); $q++) $length .= $str[$q]; | |
| 275 | $q+=2; | |
| 276 | $q+= (int)$length + 2; | |
| 277 | $serialized .= substr($str, $p, $q - $p); | |
| 278 | if ($level == 0) break 2; | |
| 279 | break; | |
| 280 | case 'a': /* array */ | |
| 281 | case 'o': /* object */ | |
| 282 | do $q++; | |
| 283 | while ( ($q < $endptr) && ($str[$q] != '{') ); | |
| 284 | $q++; | |
| 285 | $level++; | |
| 286 | $serialized .= substr($str, $p, $q - $p); | |
| 287 | break; | |
| 288 | case '}': /* end of array|object */ | |
| 289 | $q++; | |
| 290 | $serialized .= substr($str, $p, $q - $p); | |
| 291 | if (--$level == 0) break 2; | |
| 292 | break; | |
| 293 | default: | |
| 294 | return false; | |
| 295 | } | |
| 296 | } | |
| 297 | } else { | |
| 298 | $serialized .= 'N;'; | |
| 299 | $q += 2; | |
| 300 | } | |
| 301 | $items++; | |
| 302 | $p = $q; | |
| 303 | } | |
| 304 | ||
| 305 | return unserialize( 'a:' . $items . ':{' . $serialized . '}' ); | |
| 306 | } | |
| 307 | ||
| 308 | public function set_keep_alive($keep_alive) | |
| 309 | { | |
| 310 | $this->keep_alive = $keep_alive; | |
| 311 | } | |
| 312 | ||
| 313 | public function get_keep_alive() | |
| 314 | { | |
| 315 | return $this->keep_alive; | |
| 316 | } | |
| 317 | ||
| 318 | // getter for private variables | |
| 319 | public function get_ts() | |
| 320 | { | |
| 321 | return $this->changed; | |
| 322 | } | |
| 323 | ||
| 324 | // getter for private variables | |
| 325 | public function get_ip() | |
| 326 | { | |
| 327 | return $this->ip; | |
| 328 | } | |
| 329 | ||
| 330 | } | |
