SpIsValidAudience.php

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<?php

namespace SAML2\Assertion\Validation\ConstraintValidator;

use SAML2\Assertion;
use SAML2\Assertion\Validation\AssertionConstraintValidator;
use SAML2\Assertion\Validation\Result;
use SAML2\Configuration\ServiceProvider;
use SAML2\Configuration\ServiceProviderAware;

class SpIsValidAudience implements
    AssertionConstraintValidator,
    ServiceProviderAware
{
    private $serviceProvider;

    public function setServiceProvider(ServiceProvider $serviceProvider)
    {
        $this->serviceProvider = $serviceProvider;
    }

    public function validate(Assertion $assertion, Result $result)
    {
        $intendedAudiences = $assertion->getValidAudiences();
        if ($intendedAudiences === null) {
            return;
        }

        $entityId = $this->serviceProvider->getEntityId();
        if (!in_array($entityId, $intendedAudiences)) {
            $result->addError(sprintf(
                'The configured Service Provider [%s] is not a valid audience for the assertion. Audiences: [%s]',
                $entityId,
                implode('], [', $intendedAudiences)
            ));
        }
    }
}