public static function testSession($session_id)
{
//returns user id, dies absolutely if session is invalid
$prfx = DB_PREFIX;
//test session ID to have only alphanumeric characters
$session_regexp = "^[a-zA-Z0-9_]+\$";
if (!ereg($session_regexp, $session_id)) {
throwBusinessLogicError(3);
}
//test if there is at least one such user
$user_row = Data::getRow("SELECT {$prfx}user.*, {$prfx}contest.settings\r\n FROM {$prfx}session\r\n INNER JOIN {$prfx}user\r\n ON {$prfx}session.user_id={$prfx}user.id\r\n LEFT JOIN {$prfx}contest\r\n ON {$prfx}user.contest_id={$prfx}contest.id\r\n WHERE session_id='{$session_id}'");
if (!$user_row) {
throwBusinessLogicError(3);
}
if (is_null($user_row['settings'])) {
$user_row['settings'] = serialize(null);
}
RequestUtils::$user_row = $user_row;
//return found user
return $user_row;
}
