Add Google authentication

vendor/OAuth/Common/Service/ServiceInterface.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace OAuth\Common\Service;
+
+use OAuth\Common\Http\Uri\UriInterface;
+
+/**
+ * Defines methods common among all OAuth services.
+ */
+interface ServiceInterface
+{
+    /**
+     * Sends an authenticated API request to the path provided.
+     * If the path provided is not an absolute URI, the base API Uri (service-specific) will be used.
+     *
+     * @param string|UriInterface $path
+     * @param string              $method       HTTP method
+     * @param array               $body         Request body if applicable (an associative array will
+     *                                          automatically be converted into a urlencoded body)
+     * @param array               $extraHeaders Extra headers if applicable. These will override service-specific
+     *                                          any defaults.
+     *
+     * @return string
+     */
+    public function request($path, $method = 'GET', $body = null, array $extraHeaders = array());
+
+    /**
+     * Returns the url to redirect to for authorization purposes.
+     *
+     * @param array $additionalParameters
+     *
+     * @return UriInterface
+     */
+    public function getAuthorizationUri(array $additionalParameters = array());
+
+    /**
+     * Returns the authorization API endpoint.
+     *
+     * @return UriInterface
+     */
+    public function getAuthorizationEndpoint();
+
+    /**
+     * Returns the access token API endpoint.
+     *
+     * @return UriInterface
+     */
+    public function getAccessTokenEndpoint();
+}