Created captcha type (this works, but still no image generation)

Type/CaptchaType.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace Gregwar\CaptchaBundle\Type;
+
+use Symfony\Component\Form\FormView;
+use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\FormBuilder;
+use Symfony\Bridge\Doctrine\RegistryInterface;
+use Symfony\Component\Form\Exception\FormException;
+use Symfony\Component\HttpFoundation\Session;
+
+use Gregwar\CaptchaBundle\Validator\CaptchaValidator;
+
+/**
+ * Captcha type
+ *
+ * @author Gregwar <g.passault@gmail.com>
+ */
+class CaptchaType extends AbstractType
+{
+    private $key = 'captcha';
+
+    protected $session;
+
+    public function __construct(Session $session)
+    {
+        $this->session = $session;
+    }
+
+    public function buildForm(FormBuilder $builder, array $options)
+    {
+        $builder->addValidator(
+            new CaptchaValidator($this->session, $this->key)
+        );
+    }
+
+    public function buildView(FormView $view, FormInterface $form)
+    {
+        $view->set('captcha_code', $this->generateCaptchaValue());
+    }    
+
+    public function getParent(array $options)
+    {
+        return 'text';
+    }
+
+    public function getName()
+    {
+        return 'captcha';
+    }
+
+    private function generateCaptchaValue()
+    {
+        $charset = 'abcdefghijklmnopqrstuvwxyz0123456789';
+        $value = '';
+        $chars = str_split($charset);
+
+        for ($i=0; $i<5; $i++) {
+            $value.= $chars[array_rand($chars)];
+        }
+
+        $this->session->set($this->key, $value);
+
+        return $value;
+    }
+}