Close #55 add google captcha mechanism

src/User/Component/ReCaptchaComponent.php

@@ -0,0 +1,75 @@
+<?php
+
+/*
+ * This file is part of the 2amigos/yii2-usuario project.
+ *
+ * (c) 2amigOS! <http://2amigos.us/>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Da\User\Component;
+
+use Yii;
+use yii\base\Component;
+use yii\base\InvalidConfigException;
+use yii\httpclient\Client;
+
+class ReCaptchaComponent extends Component
+{
+    /**
+     * @var string the ReCAPTCHA sitekey
+     */
+    public $key;
+    /**
+     * @var string the shared key between the site and ReCAPTCHA
+     */
+    public $secret;
+
+    /**
+     * @inheritdoc
+     */
+    public function init()
+    {
+        if (empty($this->key)) {
+            throw new InvalidConfigException(Yii::t('usuario', 'Required "key" cannot be empty.'));
+        }
+
+        if (empty($this->secret)) {
+            throw new InvalidConfigException(Yii::t('usuario', 'Required "secret" cannot be empty.'));
+        }
+
+        parent::init();
+    }
+
+    /**
+     * Verifies whether a user response is valid or not.
+     *
+     * @param $value
+     *
+     * @return bool
+     */
+    public function verify($value)
+    {
+        $response = (new Client(
+            [
+                'baseUrl' => 'https://www.google.com/recaptcha/api',
+                'responseConfig' => [
+                    'format' => Client::FORMAT_JSON
+                ]
+            ]
+        ))
+            ->get(
+                'site/verify',
+                [
+                    'secret' => $this->secret,
+                    'response' => $value,
+                    'remoteip' => Yii::$app->request->getUserIP()
+                ]
+            )
+            ->send();
+
+        return $response['success'] ? : false;
+    }
+}