README

A comprehensive Nette Forms extension for integrating Cloudflare Turnstile and hCaptcha with your Nette applications.

Features

✅ Cloudflare Turnstile integration (visible, managed, invisible modes)
✅ hCaptcha integration (visible mode)
✅ PHP 7.4+ and PHP 8+ support
✅ Server-side validation
✅ Flexible configuration
✅ Easy form integration
✅ Customizable themes and sizes

Requirements

PHP: 7.4, 8.0, 8.1, 8.2
Nette Framework: 3.0+ (limited by Nette forms 3.1 as max version)
Extensions: curl or allow_url_fopen for server-side verification

Installation

Install via Composer:

composer require drabek-digital/captcha

Configuration

extensions:
    captcha: DrabekDigital\Captcha\DI\CaptchaExtension

captcha:
    type: turnstile          # or hcaptcha
    secretKey: your-secret-key
    siteKey: your-site-key
    theme: auto              # light, dark, auto (optional)
    size: normal             # normal, compact (optional)

Configuration Options

Option	Type	Required	Default	Description
`type`	string	No	`turnstile`	Captcha provider (`turnstile` or `hcaptcha`)
`secretKey`	string	Yes	-	Your secret key from the captcha provider
`siteKey`	string	Yes	-	Your site key from the captcha provider
`verifyUrl`	string	No	-	Custom verification URL (uses default if not set)
`theme`	string	No	`auto`	Theme: `light`, `dark`, or `auto`
`size`	string	No	`normal`	Size: `normal` or `compact`

Usage

Basic Usage

First do not forget to render relevant JS script include in your Latte templates:

{* This will include Turnstile or hCaptcha JS code *}
{DrabekDigital\Captcha\Assets\CaptchaFrontend::getJavascriptStatic('turnstile')|noescape} {* <script src="https://challenges.cloudflare.com/turnstile/v0/api.js" async defer></script> *}
{DrabekDigital\Captcha\Assets\CaptchaFrontend::getJavascriptStatic('hcaptcha')|noescape} {* <script src="https://js.hcaptcha.com/1/api.js" async defer></script> *}

{* Include local JS to make forms validation (prevent submission when verification is missing) and to show managed states labels *}
{* ... or manually link <LIBRARY PATH>/src/Assets/captcha-validation.js *}
{DrabekDigital\Captcha\Assets\CaptchaFrontend::getLocalJavascriptStatic()|noescape}

use Nette\Application\UI\Form;

$form = new Form;

// Simple captcha (required by default)
// The validator is automatically injected by the DI extension
$form->addCaptcha('captcha', 'Verify you are human');

// Handle form submission
$form->onSuccess[] = function($form) {
    $values = $form->getValues();
    // Process form...
};

Advanced Usage

// All supported method signatures:

// 1. Simple required visible captcha (Turnstile + hCaptcha)
$form->addCaptcha('captcha', 'Bot protection')
    ->setRequired(true);

// 2. Simple required visible captcha with custom required message (Turnstile + hCaptcha)
$form->addCaptcha('captcha', 'Bot protection')
    ->setRequired('Please verify you are human');

// 3. Simple managed captcha (only for Turnstile)
// The control + label will be rendered but the captcha can be shown or hidden based on Turnstile decision so therefore the JS code shows these messages
$form->addCaptcha('captcha', 'Bot protection')
    ->setManagedMessages('Check will be performed on background', Html::el('em')->setHtml('Check has been performed successfully.'));

// 4. Invisible captcha (only for Turnstile)
// The control + label will be hidden, the only thing that can be shown is required message.
$form->addCaptcha('captcha', 'Bot protection')
    ->setInvisible(true);

Manual Instantiation (Advanced)

If you need to create the control manually (e.g., for testing):

use DrabekDigital\Captcha\CaptchaControl;
use DrabekDigital\Captcha\CaptchaValidator;

// Create validator manually
$validator = new CaptchaValidator('secret-key', 'turnstile');

// Create control (validator is the first mandatory parameter)
$captcha = new CaptchaControl($validator, 'Captcha', 'site-key', 'turnstile');

Limitations

Only implicit rendering support for both providers (primarily due to reliability).
For hCaptcha passive mode is not supported at all (no access).
Custom verification endpoint was not tested.
Other captcha providers may work but will need custom JS to ensure form validation to work.

License

MIT License - see LICENSE file for details.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request, but better to consult via issues before large efforts.

Support

For support, please create an issue on GitHub.

drabek-digital / captcha

Maintainers

Details