Added proxy functionality based on previous code

Author: Manuele Vaccari

src/Extension/ReCaptcha/RequestMethod/ProxyPost.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace EWZ\Bundle\RecaptchaBundle\ReCaptcha\RequestMethod;
+
+use ReCaptcha\RequestMethod;
+use ReCaptcha\RequestParameters;
+
+/**
+ * Sends POST requests to the reCAPTCHA service though a proxy.
+ */
+class ProxyPost implements RequestMethod
+{
+    /**
+     * URL to which requests are POSTed.
+     * @const string
+     */
+    const SITE_VERIFY_URL = 'https://www.google.com/recaptcha/api/siteverify';
+
+    private $httpProxy;
+
+    /**
+     * Constructor
+     *
+     * @param array $httpProxy proxy data to connect to
+     */
+    public function __construct(array $httpProxy)
+    {
+        $this->httpProxy = $httpProxy;
+    }
+
+    /**
+     * Submit the POST request with the specified parameters.
+     *
+     * @param RequestParameters $params Request parameters
+     * @return string Body of the reCAPTCHA response
+     */
+    public function submit(RequestParameters $params)
+    {
+        /**
+         * PHP 5.6.0 changed the way you specify the peer name for SSL context options.
+         * Using "CN_name" will still work, but it will raise deprecated errors.
+         */
+        $peer_key = version_compare(PHP_VERSION, '5.6.0', '<') ? 'CN_name' : 'peer_name';
+        $options = array(
+            'http' => array(
+                'header' => "Content-type: application/x-www-form-urlencoded\r\n".sprintf('Proxy-Authorization: Basic %s', base64_encode($this->httpProxy['auth'])),
+                'method' => 'POST',
+                'content' => $params->toQueryString(),
+                // Force the peer to validate (not needed in 5.6.0+, but still works)
+                'verify_peer' => true,
+                // Force the peer validation to use www.google.com
+                $peer_key => 'www.google.com',
+
+                'proxy' => sprintf('tcp://%s:%s', $this->httpProxy['host'], $this->httpProxy['port']),
+                // While this is a non-standard request format, some proxy servers require it.
+                'request_fulluri' => true,
+            ),
+        );
+        $context = stream_context_create($options);
+        return file_get_contents(self::SITE_VERIFY_URL, false, $context);
+    }
+}

src/Validator/Constraints/IsTrueValidator.php

@@ -2,6 +2,7 @@
 
 namespace EWZ\Bundle\RecaptchaBundle\Validator\Constraints;
 
+use EWZ\Bundle\RecaptchaBundle\ReCaptcha\RequestMethod\ProxyPost;
 use ReCaptcha\ReCaptcha;
 use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\Security\Core\Authorization\AuthorizationChecker;
@@ -118,7 +119,11 @@ public function validate($value, Constraint $constraint)
         $answer = $masterRequest->get('g-recaptcha-response');
 
         // Verify user response with Google
-        $recaptcha = new ReCaptcha($this->privateKey);
+        $requestMethod = null;
+        if (null !== $this->httpProxy['host'] && null !== $this->httpProxy['port']) {
+            $requestMethod = new ProxyPost($this->httpProxy);
+        }
+        $recaptcha = new ReCaptcha($this->privateKey, $requestMethod);
         $response = $recaptcha->verify($answer, $remoteip);
 
         if (!$response->isSuccess()) {