Guzzle4 support

src/HttpSignatures/GuzzleHttp/Message.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace HttpSignatures\GuzzleHttp;
+
+use GuzzleHttp\Message\RequestInterface;
+
+/**
+ * Class RequestMessage
+ *
+ * wrapper around the Guzzle Request instance to have a consistent API for the HttpSignatures classes to consume
+ *
+ * @package HttpSignatures\Guzzle
+ */
+class Message
+{
+    /**
+     * @var RequestInterface
+     */
+    private $request;
+
+    /**
+     * @var MessageHeaders
+     */
+    public $headers;
+
+    public function __construct(RequestInterface $request)
+    {
+        $this->request = $request;
+        $this->headers = new MessageHeaders($request);
+    }
+
+    public function getQueryString()
+    {
+        $qs = $this->request->getQuery();
+        return $qs->count() ? $qs : null;
+    }
+
+    public function getMethod()
+    {
+        return $this->request->getMethod();
+    }
+
+    public function getPathInfo()
+    {
+        return $this->request->getPath();
+    }
+}

src/HttpSignatures/GuzzleHttp/MessageHeaders.php

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+<?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);
+    }
+}

src/HttpSignatures/GuzzleHttp/RequestSubscriber.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace HttpSignatures\GuzzleHttp;
+
+use GuzzleHttp\Event\BeforeEvent;
+use GuzzleHttp\Event\RequestEvents;
+use GuzzleHttp\Event\SubscriberInterface;
+use HttpSignatures\Context;
+
+class RequestSubscriber implements SubscriberInterface
+{
+    /**
+     * @var \HttpSignatures\Context
+     */
+    private $context;
+
+    public function __construct(Context $context)
+    {
+        $this->context = $context;
+    }
+
+    public function getEvents()
+    {
+        return ['before' => ['onBefore', RequestEvents::SIGN_REQUEST]];
+    }
+
+    public function onBefore(BeforeEvent $event)
+    {
+        $request = $event->getRequest();
+
+        if ($request->getConfig()['auth'] != 'http-signatures') {
+            return;
+        }
+
+        $this->context->signer()->sign(new Message($request));
+    }
+}