Captcha for newsletter subscription added

This form is often used for spam attacks.
Requires new template blocks in the frontend theme.

controllers/oecaptchanewsletter.php

@@ -0,0 +1,44 @@
+<?php
+/**
+ * #PHPHEADER_OECAPTCHA_LICENSE_INFORMATION#
+ */
+
+class oeCaptchaNewsletter extends oeCaptchaNewsletter_parent
+{
+    /**
+     * Class handling CAPTCHA image.
+     *
+     * @var object
+     */
+    protected $captcha = null;
+
+    /**
+     * Composes and sends user written message, returns false if some parameters
+     * are missing.
+     *
+     * @return bool
+     */
+    public function send()
+    {
+        if (!$this->getCaptcha()->passCaptcha()) {
+            return false;
+        }
+
+        return parent::send();
+    }
+
+    /**
+     * Template variable getter. Returns object of handling CAPTCHA image
+     *
+     * @return object
+     */
+    public function getCaptcha()
+    {
+        if ($this->captcha === null) {
+            $this->captcha = oxNew('oeCaptcha');
+        }
+
+        return $this->captcha;
+    }
+
+}

metadata.php

@@ -40,6 +40,7 @@ $aModule = array(
     'extend'      => array('details'           => 'oe/captcha/controllers/oecaptchadetails',
                            'contact'           => 'oe/captcha/controllers/oecaptchacontact',
                            'invite'            => 'oe/captcha/controllers/oecaptchainvite',
+                           'newsletter'        => 'oe/captcha/controllers/oecaptchanewsletter',
                            'pricealarm'        => 'oe/captcha/controllers/oecaptchapricealarm',
                            'suggest'           => 'oe/captcha/controllers/oecaptchasuggest',
                            'oxwarticledetails' => 'oe/captcha/application/component/widget/oecaptchawarticledetails'),
@@ -52,6 +53,7 @@ $aModule = array(
     ),
     'blocks'      => array(
         array('template' => 'form/contact.tpl', 'block'=>'captcha_form', 'file'=>'/application/views/blocks/captcha_form.tpl'),
+        array('template' => 'form/newsletter.tpl', 'block'=>'captcha_form', 'file'=>'/application/views/blocks/captcha_form.tpl'),
         array('template' => 'form/privatesales/invite.tpl', 'block'=>'captcha_form', 'file'=>'/application/views/blocks/captcha_form.tpl'),
         array('template' => 'form/pricealarm.tpl', 'block'=>'captcha_form', 'file'=>'/application/views/blocks/captcha_form.tpl'),
         array('template' => 'form/suggest.tpl', 'block'=>'captcha_form', 'file'=>'/application/views/blocks/captcha_form.tpl'),