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<?php
 /**
 * Handle linkback() response from MySpace.
 */
 
 if (array_key_exists('stateid', $_REQUEST)) {
 $stateId = $_REQUEST['stateid'];
 } else {
 throw new Exception('State Lost - not returned by MySpace Auth');
 }
 
 // sanitize the input
 $sid = SimpleSAML_Utilities::parseStateID($stateId);
 if (!is_null($sid['url'])) {
 SimpleSAML_Utilities::checkURLAllowed($sid['url']);
 }
 
 $state = SimpleSAML_Auth_State::loadState($stateId, sspmod_authmyspace_Auth_Source_MySpace::STAGE_INIT);
 
 if (array_key_exists('oauth_problem', $_REQUEST)) {
 // oauth_problem of 'user_refused' means user chose not to login with MySpace
 if (strcmp($_REQUEST['oauth_problem'],'user_refused') == 0) {
 $e = new SimpleSAML_Error_UserAborted();
 SimpleSAML_Auth_State::throwException($state, $e);
 }
 
 // Error
 $e = new SimpleSAML_Error_Error('Authentication failed: ' . $_REQUEST['oauth_problem']);
 SimpleSAML_Auth_State::throwException($state, $e);
 }
 
 if (array_key_exists('oauth_verifier', $_REQUEST)) {
 $state['authmyspace:oauth_verifier'] = $_REQUEST['oauth_verifier'];
 } else {
 throw new Exception('OAuth verifier not returned.');;
 }
 
 /* Find authentication source. */
 assert('array_key_exists(sspmod_authmyspace_Auth_Source_MySpace::AUTHID, $state)');
 $sourceId = $state[sspmod_authmyspace_Auth_Source_MySpace::AUTHID];
 
 $source = SimpleSAML_Auth_Source::getById($sourceId);
 if ($source === NULL) {
 throw new Exception('Could not find authentication source with id ' . $sourceId);
 }
 
 $source->finalStep($state);
 
 SimpleSAML_Auth_Source::completeAuth($state);
 
 
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