From 1e261bd3495a7b730972d5a903de6b2ecc9cc1e8 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Rapha=C3=ABl=20Gertz?= <git@rapsys.eu>
Date: Mon, 3 Oct 2022 05:13:03 +0200
Subject: [PATCH] Add captcha form type

---
 Form/CaptchaType.php | 121 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 Form/CaptchaType.php

diff --git a/Form/CaptchaType.php b/Form/CaptchaType.php
new file mode 100644
index 0000000..d479b47
--- /dev/null
+++ b/Form/CaptchaType.php
@@ -0,0 +1,121 @@
+<?php declare(strict_types=1);
+
+/*
+ * This file is part of the Rapsys PackBundle package.
+ *
+ * (c) Raphaël Gertz <symfony@rapsys.eu>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Rapsys\PackBundle\Form;
+
+use Rapsys\PackBundle\Util\ImageUtil;
+use Rapsys\PackBundle\Util\SluggerUtil;
+
+use Symfony\Contracts\Translation\TranslatorInterface;
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Extension\Core\Type\HiddenType;
+use Symfony\Component\Form\Extension\Core\Type\IntegerType;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Form\FormEvents;
+use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormError;
+
+/**
+ * Captcha Type class definition
+ *
+ * @see https://symfony.com/doc/current/form/create_custom_field_type.html
+ */
+class CaptchaType extends AbstractType {
+	/**
+	 * @var ImageUtil $image
+	 */
+	private $image;
+
+	/**
+	 * @var SluggerUtil $slugger
+	 */
+	private $slugger;
+
+	/**
+	 * @var Translator instance
+	 */
+	private $translator;
+
+	/**
+	 * Constructor
+	 *
+	 * @param ImageUtil $image
+	 * @param SluggerUtil $slugger
+	 * @param TranslatorInterface $translator The translator instance
+	 */
+	public function __construct(ImageUtil $image, SluggerUtil $slugger, TranslatorInterface $translator) {
+		//Set image
+		$this->image = $image;
+
+		//Set slugger
+		$this->slugger = $slugger;
+
+		//Set translator
+		$this->translator = $translator;
+	}
+
+	/**
+	 * Build form
+	 *
+	 * {@inheritdoc}
+	 */
+	public function buildForm(FormBuilderInterface $builder, array $options) {
+		//Set captcha
+		$captcha = $this->image->getCaptcha((new \DateTime('-1 year'))->getTimestamp());
+
+		//Add captcha token
+		$builder->add('_captcha_token', HiddenType::class, ['data' => $captcha['token'], 'empty_data' => $captcha['token']]);
+
+		//Add captcha
+		$builder->add('captcha', IntegerType::class, ['label_attr' => ['class' => 'captcha'], 'label' => '<img src="'.htmlentities($captcha['src']).'" alt="'.htmlentities($captcha['equation']).'" />', 'label_html' => true, 'translation_domain' => false]);
+
+		//Add event listener on captcha
+		$builder->addEventListener(FormEvents::PRE_SUBMIT, [$this, 'validateCaptcha']);
+    }
+
+	/**
+	 * Validate captcha
+	 *
+	 * @param FormEvent $event The form event
+	 */
+	public function validateCaptcha(FormEvent $event): void {
+		//Get form
+		$form = $event->getForm();
+
+		//Get event data
+		$data = $event->getData();
+
+		//Set token
+		$token = $form->get('_captcha_token')->getConfig()->getData();
+
+		//Without captcha
+		if (empty($data['captcha'])) {
+			//Add error on captcha
+			$form->addError(new FormError($this->translator->trans('Captcha is empty')));
+
+			//Reset captcha token
+			$data['_captcha_token'] = $token;
+
+			//Set event data
+			$event->setData($data);
+		//With invalid captcha
+		} elseif ($this->slugger->hash($data['captcha']) !== $data['_captcha_token']) {
+			//Add error on captcha
+			$form->addError(new FormError($this->translator->trans('Captcha is invalid')));
+
+			//Reset captcha token
+			$data['_captcha_token'] = $token;
+
+			//Set event data
+			$event->setData($data);
+		}
+	}
+}
-- 
2.41.0