<?php
-
// Session management functions. These provide database storage of PHP
// session info.
+require_once('include/cache.php');
+
$session_exists = 0;
$session_expire = 180000;
-if(! function_exists('ref_session_open')) {
-function ref_session_open ($s,$n) {
+function ref_session_open($s, $n) {
return true;
-}}
+}
-if(! function_exists('ref_session_read')) {
-function ref_session_read ($id) {
+function ref_session_read($id) {
global $session_exists;
- if(x($id))
- $r = q("SELECT `data` FROM `session` WHERE `sid`= '%s'", dbesc($id));
- if(count($r)) {
+ if (!x($id)) {
+ return '';
+ }
+
+ $memcache = cache::memcache();
+ if (is_object($memcache)) {
+ $data = $memcache->get(get_app()->get_hostname().":session:".$id);
+ if (!is_bool($data)) {
+ return $data;
+ }
+ logger("no data for session $id", LOGGER_TRACE);
+ return '';
+ }
+
+ $r = q("SELECT `data` FROM `session` WHERE `sid`= '%s'", dbesc($id));
+
+ if (dbm::is_result($r)) {
$session_exists = true;
return $r[0]['data'];
} else {
logger("no data for session $id", LOGGER_TRACE);
}
- return '';
-}}
-if(! function_exists('ref_session_write')) {
-function ref_session_write ($id,$data) {
+ return '';
+}
+
+/**
+ * @brief Standard PHP session write callback
+ *
+ * This callback updates the DB-stored session data and/or the expiration depending
+ * on the case. Uses the $session_expire global for existing session, 5 minutes
+ * for newly created session.
+ *
+ * @global bool $session_exists Whether a session with the given id already exists
+ * @global int $session_expire Session expiration delay in seconds
+ * @param string $id Session ID with format: [a-z0-9]{26}
+ * @param string $data Serialized session data
+ * @return boolean Returns false if parameters are missing, true otherwise
+ */
+function ref_session_write($id, $data) {
global $session_exists, $session_expire;
- if(! $id || ! $data) {
+ if (!$id || !$data) {
return false;
}
$expire = time() + $session_expire;
$default_expire = time() + 300;
- if($session_exists) {
- $r = q("UPDATE `session`
- SET `data` = '%s'
- WHERE `data` != '%s' AND `sid` = '%s'",
- dbesc($data), dbesc($data), dbesc($id));
+ $memcache = cache::memcache();
+ if (is_object($memcache)) {
+ $memcache->set(get_app()->get_hostname().":session:".$id, $data, MEMCACHE_COMPRESSED, $expire);
+ return true;
+ }
+ if ($session_exists) {
$r = q("UPDATE `session`
- SET `expire` = '%s'
- WHERE `expire` != '%s' AND `sid` = '%s'",
- dbesc($expire), dbesc($expire), dbesc($id));
- } else
+ SET `data` = '%s', `expire` = '%s'
+ WHERE `sid` = '%s'
+ AND (`data` != '%s' OR `expire` != '%s')",
+ dbesc($data), dbesc($expire), dbesc($id), dbesc($data), dbesc($expire));
+ } else {
$r = q("INSERT INTO `session`
SET `sid` = '%s', `expire` = '%s', `data` = '%s'",
dbesc($id), dbesc($default_expire), dbesc($data));
+ }
return true;
-}}
+}
-if(! function_exists('ref_session_close')) {
function ref_session_close() {
return true;
-}}
+}
+
+function ref_session_destroy($id) {
+ $memcache = cache::memcache();
+
+ if (is_object($memcache)) {
+ $memcache->delete(get_app()->get_hostname().":session:".$id);
+ return true;
+ }
-if(! function_exists('ref_session_destroy')) {
-function ref_session_destroy ($id) {
q("DELETE FROM `session` WHERE `sid` = '%s'", dbesc($id));
+
return true;
-}}
+}
-if(! function_exists('ref_session_gc')) {
function ref_session_gc($expire) {
q("DELETE FROM `session` WHERE `expire` < %d", dbesc(time()));
- q("OPTIMIZE TABLE `sess_data`");
+
return true;
-}}
+}
$gc_probability = 50;
ini_set('session.use_only_cookies', 1);
ini_set('session.cookie_httponly', 1);
-
-session_set_save_handler ('ref_session_open', 'ref_session_close',
- 'ref_session_read', 'ref_session_write',
- 'ref_session_destroy', 'ref_session_gc');
+if (!get_config('system', 'disable_database_session')) {
+ session_set_save_handler('ref_session_open', 'ref_session_close',
+ 'ref_session_read', 'ref_session_write',
+ 'ref_session_destroy', 'ref_session_gc');
+}