Laravel Captcha

A modern, highly customizable, and secure captcha package for Laravel.

This package provides an easy way to protect your web forms from bots by generating image-based captchas. It's designed to be both user-friendly for humans and challenging for bots.

Features

• ✅ SOLID Architecture: Clean, maintainable, and easily extensible code.
• 🚀 Multiple Generators: Comes with text and math captcha generators out of the box.
• 🎨 Highly Customizable: Control everything from image dimensions and colors to character sets and distortion levels.
• 🛡️ Secure: Prevents replay attacks with one-time use keys and short expiration times.
• 🔌 Seamless Laravel Integration: Includes a Service Provider, Facade, and a custom Validation Rule for easy integration.
• 🌐 Multi-language Support: Validation messages can be easily translated.

Installation

You can install the package via Composer:

composer require mydaniel/laravel-captcha

Configuration

1. Publish the configuration and translation files using the following Artisan command:

   php artisan vendor:publish --provider="MyDaniel\Captcha\CaptchaServiceProvider"
   

2. This will create two new files:

   • config/captcha.php: Here you can configure all aspects of the captcha, including asset paths, character sets, and image settings for different profiles (default, math, etc.).
   • lang/vendor/captcha/: This directory will contain the translation files for validation messages.

Usage

Using the captcha involves two steps: displaying it in your form and validating the user's input.

1. Displaying the Captcha

In your Blade view, use the Captcha::create() facade to generate the captcha data.

{{-- Generate the captcha data --}}
@php
    $captcha = \MyDaniel\Captcha\Facades\Captcha::create('default'); // Or 'math', 'inverse', etc.
@endphp

<div class="form-group">
    {{-- Display the captcha image --}}
    <img src="{{ $captcha['image'] }}" alt="Captcha Image">

    {{-- Input for the user to type the captcha code --}}
    <input type="text" id="captcha_code" name="captcha_code" required>

    {{-- Hidden field to store the captcha key --}}
    <input type="hidden" name="captcha_key" value="{{ $captcha['key'] }}">
</div>

@error('captcha_code')
    <span class="text-danger">{{ $message }}</span>
@enderror

2. Validating the Input

In your controller or form request, use the provided Captcha validation rule.

Using the Validation Rule Object (Recommended)

This method is clean and type-safe.

use Illuminate\Http\Request;
use MyDaniel\Captcha\Rules\Captcha;

public function yourControllerMethod(Request $request)
{
    $request->validate([
        // ... other fields
        'captcha_code' => ['required', new Captcha($request->input('captcha_key'), 'default')],
        'captcha_key' => 'required|string',
    ]);

    // Captcha is valid, proceed...
}

Using the String-based Rule

You can also use the rule as a string, which is useful in some scenarios.

use Illuminate\Http\Request;

public function yourControllerMethod(Request $request)
{
    $request->validate([
        // ... other fields
        'captcha_code' => 'required|captcha:' . $request->input('captcha_key') . ',default',
        'captcha_key' => 'required|string',
    ]);

    // Captcha is valid, proceed...
}

Customization

Custom Fonts and Backgrounds

You can easily use your own fonts and background images.

1. Place your .ttf font files or .png/.jpg background images in any directory within your project (e.g., public/assets/captcha).
2. Update the fonts_path and backgrounds_path in your config/captcha.php file to point to these new directories.

Creating a New Generator

The package is built to be extensible. To create a new captcha type (e.g., a question-based captcha):

1. Create a new class that implements the \MyDaniel\Captcha\Contracts\CaptchaGeneratorContract interface.

2. Implement the generate(array $config): array method.

3. Register your new generator in a service provider (e.g., AppServiceProvider):

   public function register()
   {
       $this->app->bind('captcha.generator.question', \App\Captcha\QuestionGenerator::class);
   }
   

4. You can now use 'driver' => 'question' in a new profile in your config/captcha.php file.

Security

• One-Time Use Keys: The package automatically invalidates a captcha key after the first validation attempt to prevent replay attacks.
• Rate Limiting: It is highly recommended to protect your forms with Laravel's built-in throttle middleware to prevent brute-force attacks.

License

This package is open-sourced software licensed under the MIT license.