feature #218 Integrate Guzzle 6.0 (csarrazi)

This PR was squashed before being merged into the 2.0-dev branch (closes #218).

Discussion
----------

Integrate Guzzle 6.0

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | yes
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #215
| License       | MIT

It is important to note that this PR breaks compatibility due to Guzzle 6.0 requiring PHP 5.5+, and due to Guzzle 6.0's API being different from Guzzle 4.x or 5.x. This last issue should not have any incidence, provided the user does not directly access the Guzzle client from Goutte.

Of course, these BC changes mean that the major version number should be updated, to respect semver.

Tests have been updated, and pass.

Commits
-------

d12732a Integrate Guzzle 6.0

.travis.yml

@@ -4,7 +4,6 @@ php:
     - 7.0
     - 5.6
     - 5.5
-    - 5.4
     - hhvm
 
 install:

Goutte/Client.php

@@ -13,10 +13,9 @@
 
 use GuzzleHttp\Client as GuzzleClient;
 use GuzzleHttp\ClientInterface as GuzzleClientInterface;
+use GuzzleHttp\Cookie\CookieJar;
 use GuzzleHttp\Exception\RequestException;
-use GuzzleHttp\Message\RequestInterface;
-use GuzzleHttp\Message\Response as GuzzleResponse;
-use GuzzleHttp\Post\PostFile;
+use Psr\Http\Message\ResponseInterface;
 use Symfony\Component\BrowserKit\Client as BaseClient;
 use Symfony\Component\BrowserKit\Response;
 
@@ -25,6 +24,7 @@
  *
  * @author Fabien Potencier <fabien.potencier@symfony-project.com>
  * @author Michael Dowling <michael@guzzlephp.org>
+ * @author Charles Sarrazin <charles@sarraz.in>
  */
 class Client extends BaseClient
 {
@@ -90,44 +90,44 @@ protected function doRequest($request)
             }
         }
 
-        $body = null;
+        $cookies = CookieJar::fromArray(
+            $this->getCookieJar()->allRawValues($request->getUri()),
+            $request->getServer()['HTTP_HOST']
+        );
+
+        $requestOptions = array(
+            'cookies' => $cookies,
+            'allow_redirects' => false,
+            'auth' => $this->auth,
+        );
+
         if (!in_array($request->getMethod(), array('GET', 'HEAD'))) {
             if (null !== $request->getContent()) {
-                $body = $request->getContent();
+                $requestOptions['body'] = $request->getContent();
             } else {
-                $body = $request->getParameters();
+                $requestOptions['form_params'] = $request->getParameters();
+
+                if ($files = $request->getFiles()) {
+                    $requestOptions['multipart'] = [];
+                    $this->addPostFiles($files, $requestOptions['multipart']);
+                }
             }
         }
 
-        $this->getClient()->setDefaultOption('auth', $this->auth);
-
-        $requestOptions = array(
-            'body' => $body,
-            'cookies' => $this->getCookieJar()->allRawValues($request->getUri()),
-            'allow_redirects' => false,
-        );
-
         if (!empty($headers)) {
             $requestOptions['headers'] = $headers;
         }
 
-        $guzzleRequest = $this->getClient()->createRequest(
-            $request->getMethod(),
-            $request->getUri(),
-            $requestOptions
-        );
+        $method = $request->getMethod();
+        $uri = $request->getUri();
 
         foreach ($this->headers as $name => $value) {
-            $guzzleRequest->setHeader($name, $value);
-        }
-
-        if ('POST' == $request->getMethod() || 'PUT' == $request->getMethod() && $request->getFiles()) {
-            $this->addPostFiles($guzzleRequest, $request->getFiles());
+            $requestOptions['headers'][$name] = $value;
         }
 
         // Let BrowserKit handle redirects
         try {
-            $response = $this->getClient()->send($guzzleRequest);
+            $response = $this->getClient()->request($method, $uri, $requestOptions);
         } catch (RequestException $e) {
             $response = $e->getResponse();
             if (null === $response) {
@@ -138,33 +138,45 @@ protected function doRequest($request)
         return $this->createResponse($response);
     }
 
-    protected function addPostFiles(RequestInterface $request, array $files, $arrayName = '')
+    protected function addPostFiles(array $files, array &$multipart, $arrayName = '')
     {
+        if (empty($files)) {
+            return;
+        }
+
         foreach ($files as $name => $info) {
             if (!empty($arrayName)) {
                 $name = $arrayName.'['.$name.']';
             }
 
+            $file = [
+                'name' => $name,
+            ];
+
             if (is_array($info)) {
                 if (isset($info['tmp_name'])) {
                     if ('' !== $info['tmp_name']) {
-                        $request->getBody()->addFile(new PostFile($name, fopen($info['tmp_name'], 'r'), isset($info['name']) ? $info['name'] : null));
+                        $file['contents'] = fopen($info['tmp_name'], 'r');
+                        if (isset($info['name'])) {
+                            $file['filename'] = $info['name'];
+                        }
                     } else {
                         continue;
                     }
                 } else {
-                    $this->addPostFiles($request, $info, $name);
+                    $this->addPostFiles($info, $multipart, $name);
+                    continue;
                 }
             } else {
-                $request->getBody()->addFile(new PostFile($name, fopen($info, 'r')));
+                $file['contents'] = fopen($info, 'r');
             }
+
+            $multipart[] = $file;
         }
     }
 
-    protected function createResponse(GuzzleResponse $response)
+    protected function createResponse(ResponseInterface $response)
     {
-        $headers = $response->getHeaders();
-
-        return new Response($response->getBody(true), $response->getStatusCode(), $headers);
+        return new Response((string) $response->getBody(), $response->getStatusCode(), $response->getHeaders());
     }
 }