handling recaptcha on the PHP side

lib/Form/Renderer.php

@@ -1,6 +1,8 @@
 <?php
 namespace MailPoet\Form;
 
+use MailPoet\Models\Setting;
+
 if(!defined('ABSPATH')) exit;
 
 class Renderer {
@@ -39,15 +41,23 @@ class Renderer {
   }
 
   static function renderBlocks($blocks = array(), $honeypot_enabled = true) {
+    $html = array();
     // add honeypot for spambots
-    $html = ($honeypot_enabled) ?
+    $html[] = ($honeypot_enabled) ?
       '<label class="mailpoet_hp_email_label">' . __('Please leave this field empty', 'mailpoet') . '<input type="email" name="data[email]"></label>' :
       '';
     foreach($blocks as $key => $block) {
-      $html .= static::renderBlock($block) . PHP_EOL;
+      $html[] = static::renderBlock($block) . PHP_EOL;
     }
 
-    return $html;
+    if(Setting::getValue('re_captcha.enabled')) {
+      $submit = array_pop($html);
+      $site_key = Setting::getValue('re_captcha.site_token');
+      $html[] = '<div class="g-recaptcha" data-sitekey="'. $site_key .'"></div>';
+      $html[] = $submit;
+    }
+    
+    return implode('', $html);
   }
 
   static function renderBlock($block = array()) {

lib/Form/Widget.php

@@ -7,6 +7,7 @@ use MailPoet\Config\Env;
 use MailPoet\Config\Renderer as ConfigRenderer;
 use MailPoet\Form\Renderer as FormRenderer;
 use MailPoet\Models\Form;
+use MailPoet\Models\Setting;
 use MailPoet\Util\Security;
 use MailPoet\WP\Hooks;
 
@@ -48,6 +49,9 @@ class Widget extends \WP_Widget {
     wp_print_scripts('jquery');
     wp_print_scripts('mailpoet_vendor');
     wp_print_scripts('mailpoet_public');
+    if(Setting::getValue('re_captcha.enabled')) {
+      echo '<script src="https://www.google.com/recaptcha/api.js"></script>';
+    }
     $scripts = ob_get_contents();
     ob_end_clean();
 
@@ -320,4 +324,4 @@ EOL;
       return $output;
     }
   }
-}
+}