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<?php
 /* Find the authentication state. */
 if (!array_key_exists('AuthState', $_REQUEST) || empty($_REQUEST['AuthState'])) {
 throw new SimpleSAML_Error_BadRequest('Missing mandatory parameter: AuthState');
 }
 
 $authState = $_REQUEST['AuthState'];
 
 // sanitize the input
 $sid = SimpleSAML_Utilities::parseStateID($authState);
 if (!is_null($sid['url'])) {
 SimpleSAML_Utilities::checkURLAllowed($sid['url']);
 }
 
 $state = SimpleSAML_Auth_State::loadState($authState, 'openid:auth');
 $sourceId = $state['openid:AuthId'];
 $authSource = SimpleSAML_Auth_Source::getById($sourceId);
 if ($authSource === NULL) {
 throw new SimpleSAML_Error_BadRequest('Invalid AuthId \'' . $sourceId . '\' - not found.');
 }
 
 try {
 $authSource->postAuth($state);
 /* postAuth() should never return. */
 assert('FALSE');
 } catch (SimpleSAML_Error_Exception $e) {
 SimpleSAML_Auth_State::throwException($state, $e);
 } catch (Exception $e) {
 SimpleSAML_Auth_State::throwException($state, new SimpleSAML_Error_AuthSource($sourceId, 'Error on OpenID linkback endpoint.', $e));
 }
 
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