Provider name (#1348)

* Configurable ProviderName

Co-authored-by: Tim van Dijen <tvdijen@gmail.com>

Closes #1346

modules/saml/docs/sp.md

@@ -326,6 +326,11 @@ Options
 
 :   *Note*: SAML 2 specific.
 
+`ProviderName`
+:   Human readable name of the local SP sent with the authentication request.
+
+:   *Note*: SAML 2 specific.
+
 `ProtocolBinding`
 :   The binding that should be used for SAML2 authentication responses.
     This option controls the binding that is requested through the AuthnRequest message to the IdP.

modules/saml/lib/Auth/Source/SP.php

@@ -651,6 +651,11 @@ class SP extends \SimpleSAML\Auth\Source
         if (isset($state['saml:Extensions'])) {
             $ar->setExtensions($state['saml:Extensions']);
         }
+        
+        $providerName = $this->metadata->getString("ProviderName", null);
+        if ($providerName !== null) {
+            $ar->setProviderName($providerName);
+        }
 
         // save IdP entity ID as part of the state
         $state['ExpectedIssuer'] = $idpMetadata->getString('entityid');