public static function Exists($action)
{
// See if there is a nonce like the one requested
$exists = 0;
$stmt = ulPdoDb::Prepare('session', 'SELECT COUNT(*) FROM ul_nonces WHERE action=?');
if (!ulPdoDb::BindExec($stmt, array(&$exists, 'int'), array(&$action, 'str'))) {
ul_db_fail();
return false;
}
ulPdoDb::Fetch($stmt);
return $exists > 0;
}
public static function IpBlocked($ip)
{
$block_expires = NULL;
$stmt = ulPdoDb::Prepare('log', 'SELECT block_expires FROM ul_blocked_ips WHERE ip=?');
if (!ulPdoDb::BindExec($stmt, array(&$block_expires, 'str'), array(&$ip, 'str'))) {
ul_db_fail();
return false;
}
if (ulPdoDb::Fetch($stmt)) {
$block_expires = new DateTime($block_expires);
if ($block_expires <= date_create('now')) {
self::SetBlock($ip, 0);
}
} else {
$block_expires = new DateTime('1000 years ago');
}
return $block_expires;
}
public static function TableExists($dbuser, $table_name)
{
self::Connect($dbuser);
// Add compatible syntax for sqlite
$query = self::$dbcon->getAttribute(PDO::ATTR_DRIVER_NAME) === 'sqlite' ? 'SELECT name FROM sqlite_master WHERE type = "table" AND name = ?' : 'SHOW TABLES LIKE ?';
$stmt = ulPdoDb::Prepare($dbuser, $query);
if (false === $stmt) {
ul_db_fail();
}
if (!ulPdoDb::BindExec($stmt, NULL, array(&$table_name, 'str'))) {
return false;
}
if (!ulPdoDb::Fetch($stmt)) {
return false;
}
return true;
}
public static function GetIpLastLoginAgo($ip)
{
if (UL_LOG == false) {
// We don't have the required information
return false;
}
// Get the number of login attempts to an account
$last_login = '';
$stmt = ulPdoDb::Prepare('log', "SELECT timestamp FROM ul_log WHERE ip=? AND action='auth-success' ORDER BY timestamp DESC LIMIT 1");
if (!ulPdoDb::BindExec($stmt, array(&$last_login, 'str'), array(&$ip, 'str'))) {
return false;
}
if (!ulPdoDb::Fetch($stmt)) {
// No successful login yet or no such user.
return false;
}
return time() - strtotime($last_login);
}
public function read($id)
{
if ($this->Lock($id) != true) {
return false;
}
// Even if we don't have data, we need to return an empty string
$data = '';
// Read database
$now = ulUtils::nowstring();
$stmt = ulPdoDb::Prepare('session', 'SELECT data FROM ul_sessions WHERE id=? AND session_expires>?');
if (!ulPdoDb::BindExec($stmt, array(&$data, 'lob'), array(&$id, 'str', &$now, 'str'))) {
ul_db_fail('Session management error.');
return false;
}
if (!ulPdoDb::Fetch($stmt)) {
ul_fail('Error reading session.');
return false;
}
return $data;
}
protected function UserBlockExpires($uid, &$flagged)
{
$expires = NULL;
$flagged = false;
$stmt = ulPdoDb::Prepare('auth', 'SELECT block_expires FROM ul_logins WHERE id=?');
if (!ulPdoDb::BindExec($stmt, array(&$expires, 'str'), array(&$uid, 'int'))) {
ul_db_fail();
return ulLoginBackend::BACKEND_ERROR;
}
if (!ulPdoDb::Fetch($stmt)) {
return ulLoginBackend::NO_SUCH_USER;
}
return new DateTime($expires);
}
