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<?php
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class MySessionHandler implements SessionHandlerInterface {
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private static $instance = null;
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private static $sessionTab = 0;
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private static $_sess_db = null;
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private static $db_user = null;
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private static $db_pass = null;
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private static $db_name = null;
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private static $db_host = null;
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public static function getInstance($set_tab = null, $mysqlConfig = null){
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if (is_null(self::$instance)){
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self::$instance = new self();
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}
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if ($set_tab && !is_null($set_tab) && $set_tab > 0) {
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self::setSessionTab($set_tab);
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} else {
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self::setSessionTab();
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}
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// store mysqli configuration
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if (!is_null($mysqlConfig)) {
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if (isset($mysqlConfig['db_user']) && !empty($mysqlConfig['db_user'])) {
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self::$db_user = $mysqlConfig['db_user'];
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} else {
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throw new \Exception("MySessionHandler:: - db_user not set in configuration");
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}
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if (isset($mysqlConfig['db_pass']) && !empty($mysqlConfig['db_pass'])) {
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self::$db_pass = $mysqlConfig['db_pass'];
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} else {
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throw new \Exception("MySessionHandler:: - db_pass not set in configuration");
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}
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if (isset($mysqlConfig['db_name']) && !empty($mysqlConfig['db_name'])) {
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self::$db_name = $mysqlConfig['db_name'];
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} else {
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throw new \Exception("MySessionHandler:: - db_name not set in configuration");
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}
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if (isset($mysqlConfig['db_host']) && !empty($mysqlConfig['db_host'])) {
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self::$db_host = $mysqlConfig['db_host'];
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} else {
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throw new \Exception("MySessionHandler:: - db_host not set in configuration");
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}
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}
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return self::$instance;
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}
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public static function getDBSessionId(){
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return self::$_sess_db;
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}
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public static function getSessionTab(){
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return self::$sessionTab;
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}
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public static function setSessionTab($tab = 0){
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self::$sessionTab = $tab ? (int)$tab : (int)rand(1, pow(10, 9) - 1);
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}
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public function open($savePath, $sessionName)
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{
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if(is_null(self::$sessionTab)){
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self::setSessionTab();
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}
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self::$_sess_db = mysqli_connect(self::$db_host, self::$db_user, self::$db_pass, self::$db_name);
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if (mysqli_connect_errno())
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{
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error_log("Failed to connect to MySQL: " . mysqli_connect_error());
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return false;
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}
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return true;
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}
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public function close()
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{
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return mysqli_close(self::$_sess_db);
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}
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public function read($id)
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{
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$id = mysqli_real_escape_string(self::$_sess_db, $id);
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$sql = "SELECT data
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FROM sessions
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WHERE id = '$id' and tab = '" . self::getSessionTab() . "'";
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if ($result = mysqli_query(self::$_sess_db, $sql))
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{
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if (mysqli_num_rows($result))
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{
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$record = mysqli_fetch_assoc($result);
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$decrypted = Cryptor::Decrypt($record['data']);
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$_SESSION = json_decode($decrypted, true);
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if (isset($_SESSION) && !empty($_SESSION) && $_SESSION != null) {
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return session_encode();
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}
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}
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} else {
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error_log("MySQL Read Session Error: " . mysqli_error(self::$_sess_db));
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}
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return '';
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}
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public function write($id, $data)
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{
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return true; // see commit()
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}
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public static function commit($id)
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{
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$id = mysqli_real_escape_string(self::$_sess_db, $id);
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$access = mysqli_real_escape_string(self::$_sess_db, time());
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$encrypted = Cryptor::Encrypt(json_encode($_SESSION));
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$sql = "REPLACE
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INTO sessions
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VALUES ('$id', '" . self::getSessionTab() . "', '$access', '$encrypted', NULL)"; //bugbug userId
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if (!($result = mysqli_query(self::$_sess_db, $sql))) {
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error_log("MySQL Write Session Error: " . mysqli_error(self::$_sess_db));
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}
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return $result;
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}
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public function destroy($id)
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{
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$id = mysqli_real_escape_string(self::$_sess_db, $id);
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$sql = "DELETE
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FROM sessions
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WHERE id = '$id' and tab = '" . self::getSessionTab() . "'";
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if (!($result = mysqli_query(self::$_sess_db, $sql))) {
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error_log("MySQL Destroy Session: " . mysqli_error(self::$_sess_db));
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}
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return $result;
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}
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public function gc($maxlifetime)
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{
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$old = mysqli_real_escape_string(self::$_sess_db, time() - $maxlifetime);
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$sql = "DELETE
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FROM sessions
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WHERE access < '$old'";
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if (!($result = mysqli_query(self::$_sess_db, $sql))) {
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error_log("MySQL Session GC Error: " . mysqli_error(self::$_sess_db));
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}
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return $result;
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}
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}
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