Updated docs

auth-server-client-credentials.md

@@ -0,0 +1,59 @@
+---
+layout: default
+title: Authorization server with client credentials grant
+permalink: /authorization-server/client-credentials-grant/
+---
+
+# Authorization server with client credentials grant
+
+## Setup
+
+Wherever you intialise your objects, initialize a new instance of the authorization server and bind the storage interfaces and authorization code grant:
+
+~~~ php
+$server = new \League\OAuth2\Server\AuthorizationServer;
+
+$server->setSessionStorage(new Storage\SessionStorage);
+$server->setAccessTokenStorage(new Storage\AccessTokenStorage);
+$server->setClientStorage(new Storage\ClientStorage);
+$server->setScopeStorage(new Storage\ScopeStorage);
+
+$clientCredentials = new \League\OAuth2\Server\Grant\ClientCredentialsGrant();
+$server->addGrantType($clientCredentials);
+~~~
+
+## Implementation
+
+The client will request an access token so create an `/access_token` endpoint.
+
+~~~ php
+$router->post('/access_token', function (Request $request) use ($server) {
+
+    try {
+
+        $response = $server->issueAccessToken();
+        return new Response(
+            json_encode($response),
+            200
+            [
+                'Content-type'  =>  'application/json',
+                'Cache-Control' =>  'no-store',
+                'Pragma'        =>  'no-store'
+            ]
+        );
+
+    } catch (\Exception $e) {
+
+        return new Response(
+            json_encode([
+                'error'     =>  $e->errorType,
+                'message'   =>  $e->getMessage()
+            ]),
+            $e->httpStatusCode,
+            $e->getHttpHeaders()
+        );
+
+    }
+
+});
+~~~