AuthnRequest.php

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<?php

namespace SimpleSAML\XML\Shib13;

class AuthnRequest
{
    private $issuer = null;
    private $relayState = null;

    public function setRelayState($relayState)
    {
        $this->relayState = $relayState;
    }
    
    public function getRelayState()
    {
        return $this->relayState;
    }
    
    public function setIssuer($issuer)
    {
        $this->issuer = $issuer;
    }
    public function getIssuer()
    {
        return $this->issuer;
    }

    public function createRedirect($destination, $shire)
    {
        $metadata = \SimpleSAML_Metadata_MetaDataStorageHandler::getMetadataHandler();
        $idpmetadata = $metadata->getMetaDataConfig($destination, 'shib13-idp-remote');

        $desturl = $idpmetadata->getDefaultEndpoint('SingleSignOnService', array('urn:mace:shibboleth:1.0:profiles:AuthnRequest'));
        $desturl = $desturl['Location'];

        $target = $this->getRelayState();
        
        $url = $desturl . '?' .
            'providerId=' . urlencode($this->getIssuer()) .
            '&shire=' . urlencode($shire) .
            (isset($target) ? '&target=' . urlencode($target) : '');
        return $url;
    }
}