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// GNU General Public License for more details.
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// GNU General Public License for more details.
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//
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//
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// You should have received a copy of the GNU General Public License
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// You should have received a copy of the GNU General Public License
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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/**
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 * Database based session handler.
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 *
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 * @package    core
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 * @copyright  2013 Petr Skoda {@link http://skodak.org}
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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namespace core\session;
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namespace core\session;
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 * @package    core
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 * @package    core
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 * @copyright  2013 Petr Skoda {@link http://skodak.org}
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 * @copyright  2013 Petr Skoda {@link http://skodak.org}
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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 */
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class database extends handler implements SessionHandlerInterface {
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class database extends handler implements SessionHandlerInterface {
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    /** @var \stdClass $record session record */
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    /** @var int $record session record */
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    protected $recordid = null;
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    protected $recordid = null;
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    /** @var \moodle_database $database session database */
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    /** @var \moodle_database $database session database */
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        if (!empty($CFG->session_database_acquire_lock_timeout)) {
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        if (!empty($CFG->session_database_acquire_lock_timeout)) {
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            $this->acquiretimeout = (int)$CFG->session_database_acquire_lock_timeout;
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            $this->acquiretimeout = (int)$CFG->session_database_acquire_lock_timeout;
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        }
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        }
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    }
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    }
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    /**
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     * Init session handler.
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     */
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    #[\Override]
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    public function init() {
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    public function init() {
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        if (!$this->database->session_lock_supported()) {
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        if (!$this->database->session_lock_supported()) {
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            throw new exception('sessionhandlerproblem', 'error', '', null, 'Database does not support session locking');
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            throw new exception('sessionhandlerproblem', 'error', '', null, 'Database does not support session locking');
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        if (!$result) {
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        if (!$result) {
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            throw new exception('dbsessionhandlerproblem', 'error');
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            throw new exception('dbsessionhandlerproblem', 'error');
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        }
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        }
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    }
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    }
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    /**
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     * Check the backend contains data for this session id.
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     *
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     * Note: this is intended to be called from manager::session_exists() only.
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     *
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     * @param string $sid
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     * @return bool true if session found.
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     */
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    #[\Override]
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    public function session_exists($sid) {
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    public function session_exists($sid) {
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        // It was already checked in the calling code that the record in sessions table exists.
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        // It was already checked in the calling code that the record in sessions table exists.
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        return true;
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        return true;
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    }
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    }
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    #[\Override]
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    /**
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    public function destroy(string $id): bool {
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     * Kill all active sessions, the core sessions table is
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     * purged afterwards.
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        if (!$session = $this->database->get_record('sessions', ['sid' => $id], 'id, sid')) {
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     */
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            if ($id == session_id()) {
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                $this->recordid = null;
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    public function kill_all_sessions() {
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                $this->lasthash = null;
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        // Nothing to do, the sessions table is cleared from core.
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            }
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            return true;
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        return;
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        }
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    }
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        if ($this->recordid && ($session->id == $this->recordid)) {
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            try {
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                $this->database->release_session_lock($this->recordid);
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    /**
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            } catch (\Exception $ex) {
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                // Log and ignore any problems.
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     * Kill one session, the session record is removed afterwards.
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                mtrace('Failed to release session lock: '.$ex->getMessage());
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            }
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            $this->recordid = null;
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     * @param string $sid
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            $this->lasthash = null;
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        }
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     */
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    public function kill_session($sid) {
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        $this->database->delete_records('sessions', ['id' => $session->id]);
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        // Nothing to do, the sessions table is purged afterwards.
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        return;
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        return true;
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    }
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    }
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     * @param string $sid
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     * @param string $sid
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     * @return string|false
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     * @return string|false
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     */
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     */
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    public function read(string $sid): string|false {
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    public function read(string $sid): string|false {
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        try {
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        try {
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            if (!$record = $this->database->get_record('sessions', array('sid'=>$sid), 'id')) {
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            if (!$record = $this->database->get_record('sessions', ['sid' => $sid])) {
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                // Let's cheat and skip locking if this is the first access,
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                // Let's cheat and skip locking if this is the first access,
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                // do not create the record here, let the manager do it after session init.
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                // do not create the record here, let the manager do it after session init.
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                $this->failed = false;
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                $this->failed = false;
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                $this->recordid = null;
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                $this->recordid = null;
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                $this->lasthash = sha1('');
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                $this->lasthash = sha1('');
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        }
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        }
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        return true;
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        return true;
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    }
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    /**
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     * Destroy session handler.
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     *
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     * {@see http://php.net/manual/en/function.session-set-save-handler.php}
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     *
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     * @param string $id
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     * @return bool success
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     */
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    public function destroy(string $id): bool {
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        if (!$session = $this->database->get_record('sessions', ['sid' => $id], 'id, sid')) {
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            if ($id == session_id()) {
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                $this->recordid = null;
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                $this->lasthash = null;
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            }
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            return true;
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        }
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        if ($this->recordid && ($session->id == $this->recordid)) {
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            try {
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                $this->database->release_session_lock($this->recordid);
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            } catch (\Exception $ex) {
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                // Ignore problems.
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            }
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            $this->recordid = null;
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            $this->lasthash = null;
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        }
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        $this->database->delete_records('sessions', ['id' => $session->id]);
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        return true;
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    }
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    /**
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     * GC session handler.
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     *
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     * {@see http://php.net/manual/en/function.session-set-save-handler.php}
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     *
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     * @param int $max_lifetime moodle uses special timeout rules
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     * @return bool success
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     */
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    // phpcs:ignore moodle.NamingConventions.ValidVariableName.VariableNameUnderscore
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    public function gc(int $max_lifetime): int|false {
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        // This should do something only if cron is not running properly...
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        if (!$stalelifetime = ini_get('session.gc_maxlifetime')) {
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            return false;
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        }
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        $params = ['purgebefore' => (time() - $stalelifetime)];
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        $count = $this->database->count_records_select('sessions', 'userid = 0 AND timemodified < :purgebefore', $params);
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        $this->database->delete_records_select('sessions', 'userid = 0 AND timemodified < :purgebefore', $params);
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        return $count;
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    }