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

DependencyInjection/GregwarCaptchaExtension.php

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+<?php
+
+namespace Gregwar\CaptchaBundle\DependencyInjection;
+
+use Symfony\Component\HttpKernel\DependencyInjection\Extension;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
+use Symfony\Component\Config\FileLocator;
+
+class GregwarCaptchaExtension extends Extension
+{
+    public function load(array $configs, ContainerBuilder $container)
+    {
+        $loader = new YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
+        $loader->load('services.yml');
+
+        $resources = $container->getParameter('twig.form.resources');
+        $resources[] = 'GregwarCaptchaBundle::captcha.html.twig';
+        $container->setParameter('twig.form.resources', $resources);
+    }
+}
+

GregwarCaptchaBundle.php

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+<?php
+
+namespace Gregwar\CaptchaBundle;
+
+use Symfony\Component\HttpKernel\Bundle\Bundle;
+
+class GregwarCaptchaBundle extends Bundle
+{
+}

Resources/config/services.yml

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+
+services:
+    # captcha type
+    captcha.type:
+        class: Gregwar\CaptchaBundle\Type\CaptchaType
+        arguments: [@session]
+        tags:
+            - { name: form.type, alias: captcha }

Resources/views/captcha.html.twig

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+{% block captcha_widget %}
+    [{{ captcha_code }}]<br />
+    {{ form_widget(form) }}
+{% endblock %}

Type/CaptchaType.php

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+<?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;
+    }
+}

Validator/CaptchaValidator.php

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+<?php
+
+namespace Gregwar\CaptchaBundle\Validator;
+
+use Symfony\Component\Form\FormValidatorInterface;
+use Symfony\Component\HttpFoundation\Session;
+use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\FormError;
+
+/**
+ * Captcha validator
+ *
+ * @author Gregwar <g.passault@gmail.com>
+ */
+class CaptchaValidator implements FormValidatorInterface
+{
+    /**
+     * Session
+     */
+    private $session;
+
+    /**
+     * Session key to store the code
+     */
+    private $key;
+
+    public function __construct(Session $session, $key)
+    {
+        $this->session = $session;
+        $this->key = $key;
+    }
+
+    public function validate(FormInterface $form)
+    {
+        $code = $form->getData();
+        $excepted_code = $this->getExceptedCode();
+
+        if (!($code && $excepted_code && is_string($code) && is_string($excepted_code)
+            && $this->niceize($code) == $this->niceize($excepted_code))) {
+            $form->addError(new FormError('Bad code value'));
+        }
+
+        $this->session->remove($this->key);
+    }
+
+    /**
+     * Retrieve the excepted CAPTCHA code
+     */
+    private function getExceptedCode()
+    {
+        if ($this->session->has($this->key)) {
+            return $this->session->get($this->key);
+        }
+        return null;
+    }
+
+    /**
+     * Process the codes
+     */
+    private function niceize($code) 
+    {
+        return strtr($code, 'oil', '01l');
+    }
+}