adding app/library/OAuth/Adapter classes (interface and League adapter)

app/library/OAuth/Adapter/AdapterInterface.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Httpcb\OAuth\Adapter;
+
+interface AdapterInterface
+{
+    /**
+     * Construct a adapter object.
+     *
+     * @param string $provider_name
+     * @param array $options
+     */
+    public function __construct($provider_name, $options);
+
+    /**
+     * Get the provider name
+     *
+     * @return string
+     */
+    public function getProviderName();
+
+    /**
+     * Get the authorization url.
+     *
+     * @return string
+     */
+    public function getAuthorizationUrl();
+
+    /**
+     * Fetch the AccessToken using the temporary code returned from provider.
+     *
+     * @param $code
+     * @return
+     */
+    public function fetchAccessToken($code);
+
+    /**
+     * Get resource data from provider.
+     *
+     * @return array
+     */
+    public function getResourceData();
+}