Laravel SAML IDP initiated Single Sign On

Hi,

The package itself is great but I had to use my own controller in the end.

<?php
namespace App\Http\Controllers\Saml;

use App\Http\Controllers\Controller;
use App\Traits\PerformsSingleSignOn;
use Illuminate\Http\Request;
use LightSaml\Model\Context\DeserializationContext;
use LightSaml\Model\Protocol\AuthnRequest;
use LightSaml\SamlConstants;
use Log;

class ServiceProviderLoginController extends Controller
{
    use PerformsSingleSignOn;

    /**
     * Initialise a new constructotr instance.
     */
    public function __construct()
    {
        // $this->init();
        // $this->authnRequest = new AuthnRequest;
    }

    /**
     * Attempt to log into a given Service Provider.
     *
     * @return void
     */
    public function login(Request $request)
    {
        $samlRequest = $request->get('SAMLRequest');
        $decodedXml = base64_decode($samlRequest);

        $deserializationContext = new DeserializationContext();
        $deserializationContext->getDocument()->loadXML($decodedXml);

        $this->authnRequest->deserialize($deserializationContext->getDocument()->firstChild, $deserializationContext);

        $this->destination = 'https://services-uk.sungarddx.com/SingleSignOn/ServiceProvider';

        return $this->samlResponse();
    }

    /**
     * Send a SAML message to the intended Service Provider with security assertions and other bearer assertions.
     * In this case we're explicitly sending email and name id
     *
     * @link https://www.lightsaml.com/LightSAML-Core/Cookbook/How-to-make-Response/
     *
     * @return void
     */
    public function samlResponse()
    {
    //     // Create a new SAML Response instance
        $this->response = new \LightSaml\Model\Protocol\Response();

        // Create a response object that we'll send later.
        $this->response
            ->addAssertion($assertion = new \LightSaml\Model\Assertion\Assertion())
            ->setStatus(
                new \LightSaml\Model\Protocol\Status(
                    new \LightSaml\Model\Protocol\StatusCode(
                        \LightSaml\SamlConstants::STATUS_SUCCESS
                    )
                )
            )
            ->setID(\LightSaml\Helper::generateID())
            ->setIssueInstant(new \DateTime())
            ->setDestination($this->destination)
            ->setIssuer(new \LightSaml\Model\Assertion\Issuer($this->issuer))
            ->setInResponseTo($this->authnRequest->getId());

        // Build out our Assertion instance
        $assertion
            ->setId(\LightSaml\Helper::generateID())
            ->setIssueInstant(new \DateTime())
            ->setIssuer(new \LightSaml\Model\Assertion\Issuer($this->issuer))
            ->setSignature(new \LightSaml\Model\XmlDSig\SignatureWriter($this->certificate, $this->private_key))
            ->setSubject(
                (new \LightSaml\Model\Assertion\Subject())
                    ->setNameID(new \LightSaml\Model\Assertion\NameID(
                        auth()->user()->email,
                        \LightSaml\SamlConstants::NAME_ID_FORMAT_EMAIL
                    ))
                    ->addSubjectConfirmation(
                        (new \LightSaml\Model\Assertion\SubjectConfirmation())
                            ->setMethod(\LightSaml\SamlConstants::CONFIRMATION_METHOD_BEARER)
                            ->setSubjectConfirmationData(
                                (new \LightSaml\Model\Assertion\SubjectConfirmationData())
                                ->setInResponseTo($this->authnRequest->getId())
                                ->setNotOnOrAfter(new \DateTime('+1 MINUTE'))
                                ->setRecipient($this->authnRequest->getAssertionConsumerServiceURL())
                            )
                    )
            )
            ->setConditions(
                (new \LightSaml\Model\Assertion\Conditions())
                    ->setNotBefore(new \DateTime())
                    ->setNotOnOrAfter(new \DateTime('+1 MINUTE'))
                    ->addItem(
                        new \LightSaml\Model\Assertion\AudienceRestriction([$this->authnRequest->getIssuer()->getValue()])
                    )
            )
            ->addItem(
                (new \LightSaml\Model\Assertion\AttributeStatement())
                    ->addAttribute(new \LightSaml\Model\Assertion\Attribute(
                        \LightSaml\ClaimTypes::EMAIL_ADDRESS,
                        auth()->user()->email,
                    ))
                    ->addAttribute(new \LightSaml\Model\Assertion\Attribute(
                        \LightSaml\ClaimTypes::NAME_ID,
                        auth()->user()->id,
                    ))
            )
            ->addItem(
                (new \LightSaml\Model\Assertion\AuthnStatement())
                    ->setAuthnInstant(new \DateTime('-10 MINUTE'))
                    ->setSessionIndex(\LightSaml\Helper::generateID())
                    ->setAuthnContext(
                        (new \LightSaml\Model\Assertion\AuthnContext())
                            ->setAuthnContextClassRef(\LightSaml\SamlConstants::AUTHN_CONTEXT_WINDOWS)
                    )
            );

        return $this->send(SamlConstants::BINDING_SAML2_HTTP_POST);
    }
}