Add interfaces for (a)synchronous bindings

Author: tvdijen

src/Binding/AsynchronousBindingInterface.php

@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\SAML2\Binding;
+
+/**
+ * Interface grouping common functionality for asynchronous bindings.
+ *
+ * @package simplesamlphp/saml2
+ */
+interface AsynchronousBindingInterface
+{
+}

src/Binding/HTTPArtifact.php

@@ -42,7 +42,7 @@
  *
  * @package simplesamlphp/saml2
  */
-class HTTPArtifact extends Binding implements RelayStateInterface
+class HTTPArtifact extends Binding implements AsynchronousBindingInterface, RelayStateInterface
 {
     use RelayStateTrait;
 

src/Binding/HTTPPost.php

@@ -27,7 +27,7 @@
  *
  * @package simplesamlphp/saml2
  */
-class HTTPPost extends Binding implements RelayStateInterface
+class HTTPPost extends Binding implements AsynchronousBindingInterface, RelayStateInterface
 {
     use RelayStateTrait;
 

src/Binding/HTTPRedirect.php

@@ -38,7 +38,7 @@
  *
  * @package simplesamlphp/saml2
  */
-class HTTPRedirect extends Binding implements RelayStateInterface
+class HTTPRedirect extends Binding implements AsynchronousBindingInterface, RelayStateInterface
 {
     use RelayStateTrait;
 

src/Binding/SOAP.php

@@ -29,7 +29,7 @@
  *
  * @package simplesamlphp/saml2
  */
-class SOAP extends Binding
+class SOAP extends Binding implements SynchronousBindingInterface
 {
     /**
      * @param \SimpleSAML\SAML2\XML\samlp\AbstractMessage $message

src/Binding/SynchronousBindingInterface.php

@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\SAML2\Binding;
+
+/**
+ * Interface grouping common functionality for synchronous bindings.
+ *
+ * @package simplesamlphp/saml2
+ */
+interface SynchronousBindingInterface
+{
+}