Laravel Captcha

A modern, highly customizable, secure, and high-performance 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.

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Features

• ✅ Laravel 13 & PHP 8.2+ Ready: Fully compatible with Laravel 13 and leverages PHP 8.2+ capabilities (strict types, constructor promotion, native types).
• 🚀 High Performance: Replaced slow bcrypt hashing key generation with a fast, secure, random token identifier (Str::random(40)), eliminating CPU hashing bottlenecks during page loads.
• ⚡ Intervention Image v3 Integration: Uses the latest version of the Intervention Image library with Gd driver support.
• 🎨 Highly Customizable: Control everything from image dimensions and colors to character sets, custom fonts, backgrounds, and distortion levels.
• 🛡️ Secure: Prevents replay attacks with one-time use keys, short cache expiration times, and optional encrypted client keys.
• 🔌 Seamless Laravel Integration: Includes a Service Provider, Facade, and custom Validation Rule for effortless implementation.
• 🌐 Multi-language Support: Translation files for validation messages are included out of the box.

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Installation

You can install the package via Composer:

composer require mydaniel/laravel-captcha

Local Development (Path Repository)

If you are developing this package locally inside a packages/laravel-captcha directory, add it to your root composer.json repositories block:

"repositories": [
    {
        "type": "path",
        "url": "packages/laravel-captcha",
        "options": {
            "symlink": true
        }
    }
]

Then require it:

composer require mydaniel/laravel-captcha:"*"

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Configuration

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

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

2. This will create two new files:

   • config/captcha.php: Configure all aspects of the captcha (e.g. dimensions, character sets, image styles, and drivers) under profiles like default, math, flat, and inverse.
   • lang/vendor/captcha/: Houses localization files for validation messages.

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Usage

1. Displaying the Captcha

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

@php
    $captcha = \MyDaniel\Captcha\Facades\Captcha::create('default'); // Or 'math', 'flat', 'inverse', etc.
@endphp

<div class="form-group">
    {{-- Display the captcha image (Base64 data URI) --}}
    <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 identifier --}}
    <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, validate using the custom Captcha 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 submitForm(Request $request)
{
    $request->validate([
        'captcha_code' => ['required', new Captcha($request->input('captcha_key'), 'default')],
        'captcha_key' => 'required|string',
    ]);

    // Validation passed, proceed...
}

Using the String-based Rule

You can also use the validator extension string alias:

use Illuminate\Http\Request;

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

    // Validation passed, proceed...
}

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Testing

The package features a comprehensive test suite covering generators, the orchestrator, custom validation rules, and base64 image generation.

To run the package tests independently, install development dependencies inside the package directory:

composer install --working-dir=packages/laravel-captcha

Then run PHPUnit using the package's configuration:

./packages/laravel-captcha/vendor/bin/phpunit --configuration packages/laravel-captcha/phpunit.xml

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Extensibility

Creating a New Generator

To create a new captcha type (e.g., a question-based captcha):

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

   namespace App\Captcha;
   
   use MyDaniel\Captcha\Contracts\CaptchaGeneratorContract;
   
   class QuestionGenerator implements CaptchaGeneratorContract
   {
       public function generate(array $config): array
       {
           return [
               'text' => 'What is the capital of France?',
               'key'  => 'paris',
           ];
       }
   }

2. Register your custom generator in a service provider:

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

3. Reference your new generator driver in a profile inside config/captcha.php:

   'profiles' => [
       'question' => [
           'driver' => 'question',
           'expire' => 120,
       ]
   ]

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License

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