rename app/library/OAuth.php to app/library/OAuth/Client.php and change implementation to use Adapter classes.

app/library/OAuth/Client.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace Httpcb\OAuth;
+
+use Httpcb\OAuth\Adapter\AdapterInterface;
+
+class Client
+{
+    /**
+     * Adapter to use.
+     *
+     * @var AdapterInterface
+     */
+    protected $_adapter;
+
+    /**
+     * Access Token
+     *
+     * @var string
+     */
+    protected $_token;
+
+    public function __construct(AdapterInterface $adapter)
+    {
+        $this->_adapter = $adapter;
+    }
+
+    public function getAuthorizationUrl()
+    {
+        return $this->_adapter->getAuthorizationUrl();
+    }
+
+    /**
+     * @param string $code
+     * @return UserDataInterface
+     */
+    public function authenticate($code)
+    {
+        $this->_adapter->fetchAccessToken($code);
+
+        return $this->getUserData();
+    }
+
+    /**
+     * @return UserDataInterface
+     */
+    public function getUserData()
+    {
+        $data = $this->_adapter->getResourceData();
+        return $this->_createUserData($data);
+    }
+
+    protected function _createUserData(array $data)
+    {
+        $name = $this->_adapter->getProviderName();
+        $class = "Httpcb\\OAuth\\UserData\\{$name}";
+        return new $class($data);
+    }
+}