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1 | <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); |
2 | /** | |
3 | * CodeIgniter | |
4 | * | |
5 | * An open source application development framework for PHP 5.1.6 or newer | |
6 | * | |
7 | * @package CodeIgniter | |
8 | * @author ExpressionEngine Dev Team | |
9 | * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc. | |
10 | * @license http://codeigniter.com/user_guide/license.html | |
11 | * @link http://codeigniter.com | |
12 | * @since Version 1.0 | |
13 | * @filesource | |
14 | */ | |
15 | ||
16 | // ------------------------------------------------------------------------ | |
17 | ||
18 | /** | |
19 | * Session Class | |
20 | * | |
21 | * @package CodeIgniter | |
22 | * @subpackage Libraries | |
23 | * @category Sessions | |
24 | * @author ExpressionEngine Dev Team | |
25 | * @link http://codeigniter.com/user_guide/libraries/sessions.html | |
26 | */ | |
27 | class CI_Session { | |
28 | ||
29 | var $sess_encrypt_cookie = FALSE; | |
30 | var $sess_use_database = FALSE; | |
31 | var $sess_table_name = ''; | |
32 | var $sess_expiration = 7200; | |
33 | var $sess_expire_on_close = FALSE; | |
34 | var $sess_match_ip = FALSE; | |
35 | var $sess_match_useragent = TRUE; | |
36 | var $sess_cookie_name = 'ci_session'; | |
37 | var $cookie_prefix = ''; | |
38 | var $cookie_path = ''; | |
39 | var $cookie_domain = ''; | |
40 | var $cookie_secure = FALSE; | |
41 | var $sess_time_to_update = 300; | |
42 | var $encryption_key = ''; | |
43 | var $flashdata_key = 'flash'; | |
44 | var $time_reference = 'time'; | |
45 | var $gc_probability = 5; | |
46 | var $userdata = array(); | |
47 | var $CI; | |
48 | var $now; | |
49 | ||
50 | /** | |
51 | * Session Constructor | |
52 | * | |
53 | * The constructor runs the session routines automatically | |
54 | * whenever the class is instantiated. | |
55 | */ | |
56 | public function __construct($params = array()) | |
57 | { | |
58 | log_message('debug', "Session Class Initialized"); | |
59 | ||
60 | // Set the super object to a local variable for use throughout the class | |
61 | $this->CI =& get_instance(); | |
62 | ||
63 | // Set all the session preferences, which can either be set | |
64 | // manually via the $params array above or via the config file | |
65 | foreach (array('sess_encrypt_cookie', 'sess_use_database', 'sess_table_name', 'sess_expiration', 'sess_expire_on_close', 'sess_match_ip', 'sess_match_useragent', 'sess_cookie_name', 'cookie_path', 'cookie_domain', 'cookie_secure', 'sess_time_to_update', 'time_reference', 'cookie_prefix', 'encryption_key') as $key) | |
66 | { | |
67 | $this->$key = (isset($params[$key])) ? $params[$key] : $this->CI->config->item($key); | |
68 | } | |
69 | ||
70 | if ($this->encryption_key == '') | |
71 | { | |
72 | show_error('In order to use the Session class you are required to set an encryption key in your config file.'); | |
73 | } | |
74 | ||
75 | // Load the string helper so we can use the strip_slashes() function | |
76 | $this->CI->load->helper('string'); | |
77 | ||
78 | // Do we need encryption? If so, load the encryption class | |
79 | if ($this->sess_encrypt_cookie == TRUE) | |
80 | { | |
81 | $this->CI->load->library('encrypt'); | |
82 | } | |
83 | ||
84 | // Are we using a database? If so, load it | |
85 | if ($this->sess_use_database === TRUE AND $this->sess_table_name != '') | |
86 | { | |
87 | $this->CI->load->database(); | |
88 | } | |
89 | ||
90 | // Set the "now" time. Can either be GMT or server time, based on the | |
91 | // config prefs. We use this to set the "last activity" time | |
92 | $this->now = $this->_get_time(); | |
93 | ||
94 | // Set the session length. If the session expiration is | |
95 | // set to zero we'll set the expiration two years from now. | |
96 | if ($this->sess_expiration == 0) | |
97 | { | |
98 | $this->sess_expiration = (60*60*24*365*2); | |
99 | } | |
100 | ||
101 | // Set the cookie name | |
102 | $this->sess_cookie_name = $this->cookie_prefix.$this->sess_cookie_name; | |
103 | ||
104 | // Run the Session routine. If a session doesn't exist we'll | |
105 | // create a new one. If it does, we'll update it. | |
106 | if ( ! $this->sess_read()) | |
107 | { | |
108 | $this->sess_create(); | |
109 | } | |
110 | else | |
111 | { | |
112 | $this->sess_update(); | |
113 | } | |
114 | ||
115 | // Delete 'old' flashdata (from last request) | |
116 | $this->_flashdata_sweep(); | |
117 | ||
118 | // Mark all new flashdata as old (data will be deleted before next request) | |
119 | $this->_flashdata_mark(); | |
120 | ||
121 | // Delete expired sessions if necessary | |
122 | $this->_sess_gc(); | |
123 | ||
124 | log_message('debug', "Session routines successfully run"); | |
125 | } | |
126 | ||
127 | // -------------------------------------------------------------------- | |
128 | ||
129 | /** | |
130 | * Fetch the current session data if it exists | |
131 | * | |
132 | * @access public | |
133 | * @return bool | |
134 | */ | |
135 | function sess_read() | |
136 | { | |
137 | // Fetch the cookie | |
138 | $session = $this->CI->input->cookie($this->sess_cookie_name); | |
139 | ||
140 | // No cookie? Goodbye cruel world!... | |
141 | if ($session === FALSE) | |
142 | { | |
143 | log_message('debug', 'A session cookie was not found.'); | |
144 | return FALSE; | |
145 | } | |
146 | ||
147 | // Decrypt the cookie data | |
148 | if ($this->sess_encrypt_cookie == TRUE) | |
149 | { | |
150 | $session = $this->CI->encrypt->decode($session); | |
151 | } | |
152 | else | |
153 | { | |
154 | // encryption was not used, so we need to check the md5 hash | |
155 | $hash = substr($session, strlen($session)-32); // get last 32 chars | |
156 | $session = substr($session, 0, strlen($session)-32); | |
157 | ||
158 | // Does the md5 hash match? This is to prevent manipulation of session data in userspace | |
159 | if ($hash !== md5($session.$this->encryption_key)) | |
160 | { | |
161 | log_message('error', 'The session cookie data did not match what was expected. This could be a possible hacking attempt.'); | |
162 | $this->sess_destroy(); | |
163 | return FALSE; | |
164 | } | |
165 | } | |
166 | ||
167 | // Unserialize the session array | |
168 | $session = $this->_unserialize($session); | |
169 | ||
170 | // Is the session data we unserialized an array with the correct format? | |
171 | if ( ! is_array($session) OR ! isset($session['session_id']) OR ! isset($session['ip_address']) OR ! isset($session['user_agent']) OR ! isset($session['last_activity'])) | |
172 | { | |
173 | $this->sess_destroy(); | |
174 | return FALSE; | |
175 | } | |
176 | ||
177 | // Is the session current? | |
178 | if (($session['last_activity'] + $this->sess_expiration) < $this->now) | |
179 | { | |
180 | $this->sess_destroy(); | |
181 | return FALSE; | |
182 | } | |
183 | ||
184 | // Does the IP Match? | |
185 | if ($this->sess_match_ip == TRUE AND $session['ip_address'] != $this->CI->input->ip_address()) | |
186 | { | |
187 | $this->sess_destroy(); | |
188 | return FALSE; | |
189 | } | |
190 | ||
191 | // Does the User Agent Match? | |
192 | if ($this->sess_match_useragent == TRUE AND trim($session['user_agent']) != trim(substr($this->CI->input->user_agent(), 0, 120))) | |
193 | { | |
194 | $this->sess_destroy(); | |
195 | return FALSE; | |
196 | } | |
197 | ||
198 | // Is there a corresponding session in the DB? | |
199 | if ($this->sess_use_database === TRUE) | |
200 | { | |
201 | $this->CI->db->where('session_id', $session['session_id']); | |
202 | ||
203 | if ($this->sess_match_ip == TRUE) | |
204 | { | |
205 | $this->CI->db->where('ip_address', $session['ip_address']); | |
206 | } | |
207 | ||
208 | if ($this->sess_match_useragent == TRUE) | |
209 | { | |
210 | $this->CI->db->where('user_agent', $session['user_agent']); | |
211 | } | |
212 | ||
213 | $query = $this->CI->db->get($this->sess_table_name); | |
214 | ||
215 | // No result? Kill it! | |
216 | if ($query->num_rows() == 0) | |
217 | { | |
218 | $this->sess_destroy(); | |
219 | return FALSE; | |
220 | } | |
221 | ||
222 | // Is there custom data? If so, add it to the main session array | |
223 | $row = $query->row(); | |
224 | if (isset($row->user_data) AND $row->user_data != '') | |
225 | { | |
226 | $custom_data = $this->_unserialize($row->user_data); | |
227 | ||
228 | if (is_array($custom_data)) | |
229 | { | |
230 | foreach ($custom_data as $key => $val) | |
231 | { | |
232 | $session[$key] = $val; | |
233 | } | |
234 | } | |
235 | } | |
236 | } | |
237 | ||
238 | // Session is valid! | |
239 | $this->userdata = $session; | |
240 | unset($session); | |
241 | ||
242 | return TRUE; | |
243 | } | |
244 | ||
245 | // -------------------------------------------------------------------- | |
246 | ||
247 | /** | |
248 | * Write the session data | |
249 | * | |
250 | * @access public | |
251 | * @return void | |
252 | */ | |
253 | function sess_write() | |
254 | { | |
255 | // Are we saving custom data to the DB? If not, all we do is update the cookie | |
256 | if ($this->sess_use_database === FALSE) | |
257 | { | |
258 | $this->_set_cookie(); | |
259 | return; | |
260 | } | |
261 | ||
262 | // set the custom userdata, the session data we will set in a second | |
263 | $custom_userdata = $this->userdata; | |
264 | $cookie_userdata = array(); | |
265 | ||
266 | // Before continuing, we need to determine if there is any custom data to deal with. | |
267 | // Let's determine this by removing the default indexes to see if there's anything left in the array | |
268 | // and set the session data while we're at it | |
269 | foreach (array('session_id','ip_address','user_agent','last_activity') as $val) | |
270 | { | |
271 | unset($custom_userdata[$val]); | |
272 | $cookie_userdata[$val] = $this->userdata[$val]; | |
273 | } | |
274 | ||
275 | // Did we find any custom data? If not, we turn the empty array into a string | |
276 | // since there's no reason to serialize and store an empty array in the DB | |
277 | if (count($custom_userdata) === 0) | |
278 | { | |
279 | $custom_userdata = ''; | |
280 | } | |
281 | else | |
282 | { | |
283 | // Serialize the custom data array so we can store it | |
284 | $custom_userdata = $this->_serialize($custom_userdata); | |
285 | } | |
286 | ||
287 | // Run the update query | |
288 | $this->CI->db->where('session_id', $this->userdata['session_id']); | |
289 | $this->CI->db->update($this->sess_table_name, array('last_activity' => $this->userdata['last_activity'], 'user_data' => $custom_userdata)); | |
290 | ||
291 | // Write the cookie. Notice that we manually pass the cookie data array to the | |
292 | // _set_cookie() function. Normally that function will store $this->userdata, but | |
293 | // in this case that array contains custom data, which we do not want in the cookie. | |
294 | $this->_set_cookie($cookie_userdata); | |
295 | } | |
296 | ||
297 | // -------------------------------------------------------------------- | |
298 | ||
299 | /** | |
300 | * Create a new session | |
301 | * | |
302 | * @access public | |
303 | * @return void | |
304 | */ | |
305 | function sess_create() | |
306 | { | |
307 | $sessid = ''; | |
308 | while (strlen($sessid) < 32) | |
309 | { | |
310 | $sessid .= mt_rand(0, mt_getrandmax()); | |
311 | } | |
312 | ||
313 | // To make the session ID even more secure we'll combine it with the user's IP | |
314 | $sessid .= $this->CI->input->ip_address(); | |
315 | ||
316 | $this->userdata = array( | |
317 | 'session_id' => md5(uniqid($sessid, TRUE)), | |
318 | 'ip_address' => $this->CI->input->ip_address(), | |
319 | 'user_agent' => substr($this->CI->input->user_agent(), 0, 120), | |
320 | 'last_activity' => $this->now, | |
321 | 'user_data' => '' | |
322 | ); | |
323 | ||
324 | ||
325 | // Save the data to the DB if needed | |
326 | if ($this->sess_use_database === TRUE) | |
327 | { | |
328 | $this->CI->db->query($this->CI->db->insert_string($this->sess_table_name, $this->userdata)); | |
329 | } | |
330 | ||
331 | // Write the cookie | |
332 | $this->_set_cookie(); | |
333 | } | |
334 | ||
335 | // -------------------------------------------------------------------- | |
336 | ||
337 | /** | |
338 | * Update an existing session | |
339 | * | |
340 | * @access public | |
341 | * @return void | |
342 | */ | |
343 | function sess_update() | |
344 | { | |
345 | // We only update the session every five minutes by default | |
346 | if (($this->userdata['last_activity'] + $this->sess_time_to_update) >= $this->now) | |
347 | { | |
348 | return; | |
349 | } | |
350 | ||
351 | // Save the old session id so we know which record to | |
352 | // update in the database if we need it | |
353 | $old_sessid = $this->userdata['session_id']; | |
354 | $new_sessid = ''; | |
355 | while (strlen($new_sessid) < 32) | |
356 | { | |
357 | $new_sessid .= mt_rand(0, mt_getrandmax()); | |
358 | } | |
359 | ||
360 | // To make the session ID even more secure we'll combine it with the user's IP | |
361 | $new_sessid .= $this->CI->input->ip_address(); | |
362 | ||
363 | // Turn it into a hash | |
364 | $new_sessid = md5(uniqid($new_sessid, TRUE)); | |
365 | ||
366 | // Update the session data in the session data array | |
367 | $this->userdata['session_id'] = $new_sessid; | |
368 | $this->userdata['last_activity'] = $this->now; | |
369 | ||
370 | // _set_cookie() will handle this for us if we aren't using database sessions | |
371 | // by pushing all userdata to the cookie. | |
372 | $cookie_data = NULL; | |
373 | ||
374 | // Update the session ID and last_activity field in the DB if needed | |
375 | if ($this->sess_use_database === TRUE) | |
376 | { | |
377 | // set cookie explicitly to only have our session data | |
378 | $cookie_data = array(); | |
379 | foreach (array('session_id','ip_address','user_agent','last_activity') as $val) | |
380 | { | |
381 | $cookie_data[$val] = $this->userdata[$val]; | |
382 | } | |
383 | ||
384 | $this->CI->db->query($this->CI->db->update_string($this->sess_table_name, array('last_activity' => $this->now, 'session_id' => $new_sessid), array('session_id' => $old_sessid))); | |
385 | } | |
386 | ||
387 | // Write the cookie | |
388 | $this->_set_cookie($cookie_data); | |
389 | } | |
390 | ||
391 | // -------------------------------------------------------------------- | |
392 | ||
393 | /** | |
394 | * Destroy the current session | |
395 | * | |
396 | * @access public | |
397 | * @return void | |
398 | */ | |
399 | function sess_destroy() | |
400 | { | |
401 | // Kill the session DB row | |
402 | if ($this->sess_use_database === TRUE && isset($this->userdata['session_id'])) | |
403 | { | |
404 | $this->CI->db->where('session_id', $this->userdata['session_id']); | |
405 | $this->CI->db->delete($this->sess_table_name); | |
406 | } | |
407 | ||
408 | // Kill the cookie | |
409 | setcookie( | |
410 | $this->sess_cookie_name, | |
411 | addslashes(serialize(array())), | |
412 | ($this->now - 31500000), | |
413 | $this->cookie_path, | |
414 | $this->cookie_domain, | |
415 | 0 | |
416 | ); | |
417 | ||
418 | // Kill session data | |
419 | $this->userdata = array(); | |
420 | } | |
421 | ||
422 | // -------------------------------------------------------------------- | |
423 | ||
424 | /** | |
425 | * Fetch a specific item from the session array | |
426 | * | |
427 | * @access public | |
428 | * @param string | |
429 | * @return string | |
430 | */ | |
431 | function userdata($item) | |
432 | { | |
433 | return ( ! isset($this->userdata[$item])) ? FALSE : $this->userdata[$item]; | |
434 | } | |
435 | ||
436 | // -------------------------------------------------------------------- | |
437 | ||
438 | /** | |
439 | * Fetch all session data | |
440 | * | |
441 | * @access public | |
442 | * @return array | |
443 | */ | |
444 | function all_userdata() | |
445 | { | |
446 | return $this->userdata; | |
447 | } | |
448 | ||
449 | // -------------------------------------------------------------------- | |
450 | ||
451 | /** | |
452 | * Add or change data in the "userdata" array | |
453 | * | |
454 | * @access public | |
455 | * @param mixed | |
456 | * @param string | |
457 | * @return void | |
458 | */ | |
459 | function set_userdata($newdata = array(), $newval = '') | |
460 | { | |
461 | if (is_string($newdata)) | |
462 | { | |
463 | $newdata = array($newdata => $newval); | |
464 | } | |
465 | ||
466 | if (count($newdata) > 0) | |
467 | { | |
468 | foreach ($newdata as $key => $val) | |
469 | { | |
470 | $this->userdata[$key] = $val; | |
471 | } | |
472 | } | |
473 | ||
474 | $this->sess_write(); | |
475 | } | |
476 | ||
477 | // -------------------------------------------------------------------- | |
478 | ||
479 | /** | |
480 | * Delete a session variable from the "userdata" array | |
481 | * | |
482 | * @access array | |
483 | * @return void | |
484 | */ | |
485 | function unset_userdata($newdata = array()) | |
486 | { | |
487 | if (is_string($newdata)) | |
488 | { | |
489 | $newdata = array($newdata => ''); | |
490 | } | |
491 | ||
492 | if (count($newdata) > 0) | |
493 | { | |
494 | foreach ($newdata as $key => $val) | |
495 | { | |
496 | unset($this->userdata[$key]); | |
497 | } | |
498 | } | |
499 | ||
500 | $this->sess_write(); | |
501 | } | |
502 | ||
503 | // ------------------------------------------------------------------------ | |
504 | ||
505 | /** | |
506 | * Add or change flashdata, only available | |
507 | * until the next request | |
508 | * | |
509 | * @access public | |
510 | * @param mixed | |
511 | * @param string | |
512 | * @return void | |
513 | */ | |
514 | function set_flashdata($newdata = array(), $newval = '') | |
515 | { | |
516 | if (is_string($newdata)) | |
517 | { | |
518 | $newdata = array($newdata => $newval); | |
519 | } | |
520 | ||
521 | if (count($newdata) > 0) | |
522 | { | |
523 | foreach ($newdata as $key => $val) | |
524 | { | |
525 | $flashdata_key = $this->flashdata_key.':new:'.$key; | |
526 | $this->set_userdata($flashdata_key, $val); | |
527 | } | |
528 | } | |
529 | } | |
530 | ||
531 | // ------------------------------------------------------------------------ | |
532 | ||
533 | /** | |
534 | * Keeps existing flashdata available to next request. | |
535 | * | |
536 | * @access public | |
537 | * @param string | |
538 | * @return void | |
539 | */ | |
540 | function keep_flashdata($key) | |
541 | { | |
542 | // 'old' flashdata gets removed. Here we mark all | |
543 | // flashdata as 'new' to preserve it from _flashdata_sweep() | |
544 | // Note the function will return FALSE if the $key | |
545 | // provided cannot be found | |
546 | $old_flashdata_key = $this->flashdata_key.':old:'.$key; | |
547 | $value = $this->userdata($old_flashdata_key); | |
548 | ||
549 | $new_flashdata_key = $this->flashdata_key.':new:'.$key; | |
550 | $this->set_userdata($new_flashdata_key, $value); | |
551 | } | |
552 | ||
553 | // ------------------------------------------------------------------------ | |
554 | ||
555 | /** | |
556 | * Fetch a specific flashdata item from the session array | |
557 | * | |
558 | * @access public | |
559 | * @param string | |
560 | * @return string | |
561 | */ | |
562 | function flashdata($key) | |
563 | { | |
564 | $flashdata_key = $this->flashdata_key.':old:'.$key; | |
565 | return $this->userdata($flashdata_key); | |
566 | } | |
567 | ||
568 | // ------------------------------------------------------------------------ | |
569 | ||
570 | /** | |
571 | * Identifies flashdata as 'old' for removal | |
572 | * when _flashdata_sweep() runs. | |
573 | * | |
574 | * @access private | |
575 | * @return void | |
576 | */ | |
577 | function _flashdata_mark() | |
578 | { | |
579 | $userdata = $this->all_userdata(); | |
580 | foreach ($userdata as $name => $value) | |
581 | { | |
582 | $parts = explode(':new:', $name); | |
583 | if (is_array($parts) && count($parts) === 2) | |
584 | { | |
585 | $new_name = $this->flashdata_key.':old:'.$parts[1]; | |
586 | $this->set_userdata($new_name, $value); | |
587 | $this->unset_userdata($name); | |
588 | } | |
589 | } | |
590 | } | |
591 | ||
592 | // ------------------------------------------------------------------------ | |
593 | ||
594 | /** | |
595 | * Removes all flashdata marked as 'old' | |
596 | * | |
597 | * @access private | |
598 | * @return void | |
599 | */ | |
600 | ||
601 | function _flashdata_sweep() | |
602 | { | |
603 | $userdata = $this->all_userdata(); | |
604 | foreach ($userdata as $key => $value) | |
605 | { | |
606 | if (strpos($key, ':old:')) | |
607 | { | |
608 | $this->unset_userdata($key); | |
609 | } | |
610 | } | |
611 | ||
612 | } | |
613 | ||
614 | // -------------------------------------------------------------------- | |
615 | ||
616 | /** | |
617 | * Get the "now" time | |
618 | * | |
619 | * @access private | |
620 | * @return string | |
621 | */ | |
622 | function _get_time() | |
623 | { | |
624 | if (strtolower($this->time_reference) == 'gmt') | |
625 | { | |
626 | $now = time(); | |
627 | $time = mktime(gmdate("H", $now), gmdate("i", $now), gmdate("s", $now), gmdate("m", $now), gmdate("d", $now), gmdate("Y", $now)); | |
628 | } | |
629 | else | |
630 | { | |
631 | $time = time(); | |
632 | } | |
633 | ||
634 | return $time; | |
635 | } | |
636 | ||
637 | // -------------------------------------------------------------------- | |
638 | ||
639 | /** | |
640 | * Write the session cookie | |
641 | * | |
642 | * @access public | |
643 | * @return void | |
644 | */ | |
645 | function _set_cookie($cookie_data = NULL) | |
646 | { | |
647 | if (is_null($cookie_data)) | |
648 | { | |
649 | $cookie_data = $this->userdata; | |
650 | } | |
651 | ||
652 | // Serialize the userdata for the cookie | |
653 | $cookie_data = $this->_serialize($cookie_data); | |
654 | ||
655 | if ($this->sess_encrypt_cookie == TRUE) | |
656 | { | |
657 | $cookie_data = $this->CI->encrypt->encode($cookie_data); | |
658 | } | |
659 | else | |
660 | { | |
661 | // if encryption is not used, we provide an md5 hash to prevent userside tampering | |
662 | $cookie_data = $cookie_data.md5($cookie_data.$this->encryption_key); | |
663 | } | |
664 | ||
665 | $expire = ($this->sess_expire_on_close === TRUE) ? 0 : $this->sess_expiration + time(); | |
666 | ||
667 | // Set the cookie | |
668 | setcookie( | |
669 | $this->sess_cookie_name, | |
670 | $cookie_data, | |
671 | $expire, | |
672 | $this->cookie_path, | |
673 | $this->cookie_domain, | |
674 | $this->cookie_secure | |
675 | ); | |
676 | } | |
677 | ||
678 | // -------------------------------------------------------------------- | |
679 | ||
680 | /** | |
681 | * Serialize an array | |
682 | * | |
683 | * This function first converts any slashes found in the array to a temporary | |
684 | * marker, so when it gets unserialized the slashes will be preserved | |
685 | * | |
686 | * @access private | |
687 | * @param array | |
688 | * @return string | |
689 | */ | |
690 | function _serialize($data) | |
691 | { | |
692 | if (is_array($data)) | |
693 | { | |
694 | foreach ($data as $key => $val) | |
695 | { | |
696 | if (is_string($val)) | |
697 | { | |
698 | $data[$key] = str_replace('\\', '{{slash}}', $val); | |
699 | } | |
700 | } | |
701 | } | |
702 | else | |
703 | { | |
704 | if (is_string($data)) | |
705 | { | |
706 | $data = str_replace('\\', '{{slash}}', $data); | |
707 | } | |
708 | } | |
709 | ||
710 | return serialize($data); | |
711 | } | |
712 | ||
713 | // -------------------------------------------------------------------- | |
714 | ||
715 | /** | |
716 | * Unserialize | |
717 | * | |
718 | * This function unserializes a data string, then converts any | |
719 | * temporary slash markers back to actual slashes | |
720 | * | |
721 | * @access private | |
722 | * @param array | |
723 | * @return string | |
724 | */ | |
725 | function _unserialize($data) | |
726 | { | |
727 | $data = @unserialize(strip_slashes($data)); | |
728 | ||
729 | if (is_array($data)) | |
730 | { | |
731 | foreach ($data as $key => $val) | |
732 | { | |
733 | if (is_string($val)) | |
734 | { | |
735 | $data[$key] = str_replace('{{slash}}', '\\', $val); | |
736 | } | |
737 | } | |
738 | ||
739 | return $data; | |
740 | } | |
741 | ||
742 | return (is_string($data)) ? str_replace('{{slash}}', '\\', $data) : $data; | |
743 | } | |
744 | ||
745 | // -------------------------------------------------------------------- | |
746 | ||
747 | /** | |
748 | * Garbage collection | |
749 | * | |
750 | * This deletes expired session rows from database | |
751 | * if the probability percentage is met | |
752 | * | |
753 | * @access public | |
754 | * @return void | |
755 | */ | |
756 | function _sess_gc() | |
757 | { | |
758 | if ($this->sess_use_database != TRUE) | |
759 | { | |
760 | return; | |
761 | } | |
762 | ||
763 | srand(time()); | |
764 | if ((rand() % 100) < $this->gc_probability) | |
765 | { | |
766 | $expire = $this->now - $this->sess_expiration; | |
767 | ||
768 | $this->CI->db->where("last_activity < {$expire}"); | |
769 | $this->CI->db->delete($this->sess_table_name); | |
770 | ||
771 | log_message('debug', 'Session garbage collection performed.'); | |
772 | } | |
773 | } | |
774 | ||
775 | ||
776 | } | |
777 | // END Session Class | |
778 | ||
779 | /* End of file Session.php */ | |
780 | /* Location: ./system/libraries/Session.php */ |