Guzzle4 support

src/HttpSignatures/GuzzleHttp/MessageHeaders.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace HttpSignatures\GuzzleHttp;
+
+use GuzzleHttp\Message\MessageInterface;
+
+/**
+ * Class MessageHeaders
+ *
+ * wrapper around the Guzzle Request instance to have a consistent API for the HttpSignatures classes to consume
+ *
+ * @package HttpSignatures\Guzzle
+ */
+class MessageHeaders
+{
+    /**
+     * @var MessageInterface
+     */
+    private $request;
+
+    public function __construct(MessageInterface $request)
+    {
+        $this->request = $request;
+    }
+
+    public function has($header)
+    {
+        return $this->request->hasHeader($header);
+    }
+
+    public function get($header)
+    {
+        return $this->request->getHeader($header);
+    }
+
+    public function set($header, $value)
+    {
+        $this->request->setHeader($header, $value);
+    }
+}