Add www-directory to psalm-config and fix some issues

psalm.xml

@@ -22,6 +22,7 @@
         <directory name="modules/saml" />
 
         <directory name="tests" />
+        <directory name="www" />
 
         <!-- Ignore deprecated classes -->
         <ignoreFiles>

www/saml2/idp/ArtifactResolutionService.php

@@ -47,10 +47,8 @@ if (!($request instanceof \SAML2\ArtifactResolve)) {
 }
 
 $issuer = $request->getIssuer();
-if (!is_string($issuer)) {
-    $issuer = $issuer->getValue();
-}
-
+\Webmozart\Assert\Assert::notNull($issuer);
+$issuer = $issuer->getValue();
 $spMetadata = $metadata->getMetaDataConfig($issuer, 'saml20-sp-remote');
 
 $artifact = $request->getArtifact();
@@ -60,7 +58,7 @@ $store->delete('artifact', $artifact);
 
 if ($responseData !== null) {
     $document = \SAML2\DOMDocumentFactory::fromString($responseData);
-    $responseXML = $document->firstChild;
+    $responseXML = $document->documentElement;
 } else {
     $responseXML = null;
 }

www/saml2/idp/metadata.php

@@ -200,9 +200,11 @@ try {
 
     $technicalContactEmail = $config->getString('technicalcontact_email', false);
     if ($technicalContactEmail && $technicalContactEmail !== 'na@example.org') {
-        $techcontact['emailAddress'] = $technicalContactEmail;
-        $techcontact['name'] = $config->getString('technicalcontact_name', null);
-        $techcontact['contactType'] = 'technical';
+        $techcontact = [
+            'emailAddress' => $technicalContactEmail,
+            'name' => $config->getString('technicalcontact_name', null),
+            'contactType' => 'technical',
+        ];
         $metaArray['contacts'][] = Metadata::getContact($techcontact);
     }