Add Google authentication

vendor/OAuth/Common/Http/Client/AbstractClient.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace OAuth\Common\Http\Client;
+
+/**
+ * Abstract HTTP client
+ */
+abstract class AbstractClient implements ClientInterface
+{
+    /**
+     * @var string The user agent string passed to services
+     */
+    protected $userAgent;
+
+    /**
+     * @var int The maximum number of redirects
+     */
+    protected $maxRedirects = 5;
+
+    /**
+     * @var int The maximum timeout
+     */
+    protected $timeout = 15;
+
+    /**
+     * Creates instance
+     *
+     * @param string $userAgent The UA string the client will use
+     */
+    public function __construct($userAgent = 'PHPoAuthLib')
+    {
+        $this->userAgent = $userAgent;
+    }
+
+    /**
+     * @param int $redirects Maximum redirects for client
+     *
+     * @return ClientInterface
+     */
+    public function setMaxRedirects($redirects)
+    {
+        $this->maxRedirects = $redirects;
+
+        return $this;
+    }
+
+    /**
+     * @param int $timeout Request timeout time for client in seconds
+     *
+     * @return ClientInterface
+     */
+    public function setTimeout($timeout)
+    {
+        $this->timeout = $timeout;
+
+        return $this;
+    }
+
+    /**
+     * @param array $headers
+     */
+    public function normalizeHeaders(&$headers)
+    {
+        // Normalize headers
+        array_walk(
+            $headers,
+            function (&$val, &$key) {
+                $key = ucfirst(strtolower($key));
+                $val = ucfirst(strtolower($key)) . ': ' . $val;
+            }
+        );
+    }
+}