Add Google authentication

vendor/OAuth/OAuth1/Signature/SignatureInterface.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace OAuth\OAuth1\Signature;
+
+use OAuth\Common\Consumer\CredentialsInterface;
+use OAuth\Common\Http\Uri\UriInterface;
+
+interface SignatureInterface
+{
+    /**
+     * @param string $algorithm
+     */
+    public function setHashingAlgorithm($algorithm);
+
+    /**
+     * @param string $token
+     */
+    public function setTokenSecret($token);
+
+    /**
+     * @param UriInterface $uri
+     * @param array        $params
+     * @param string       $method
+     *
+     * @return string
+     */
+    public function getSignature(UriInterface $uri, array $params, $method = 'POST');
+}