Flutter CAPTCHA Generator

A simple and customizable CAPTCHA generator for Flutter applications. This package allows you to generate CAPTCHA images with random text, distortion effects, and easy verification.

Features

Generate random CAPTCHA images
Customizable text length, font size, and colors
Enable or disable distortion for added security
Easy verification of user input

Example CAPTCHA Output

CAPTCHA Example

Installation

Add this package to your pubspec.yaml:

dependencies:
  captcha_generator: latest

Then, run:

flutter pub get

Usage

Import the package

import 'package:captcha_generator/captcha_generator.dart';

Generate and Verify CAPTCHA

final CaptchaController _captchaController = CaptchaController();
Uint8List? _captchaBytes;

void generateCaptcha() async {
  _captchaBytes = await _captchaController.generateCaptchaImage();
}

bool isValid = _captchaController.verifyCaptcha(userInput);

API Reference

`CaptchaController`

generateCaptchaImage() → Generates a new CAPTCHA image and returns Uint8List.
verifyCaptcha(String userInput) → Verifies user input against the generated CAPTCHA text. Returns true if matched, false otherwise.

Customization

You can customize the CAPTCHA using the CaptchaController constructor:

CaptchaController(
  length: 6, // Length of the CAPTCHA text
  fontSize: 30.0, // Font size of CAPTCHA text
  textColor: Colors.black, // Text color
  backgroundColor: Colors.grey, // Background color
  enableDistortion: true, // Enable distortion for security
  includeLowercase: false, // Adds lowercase to the captcha text
);

License

This project is licensed under the MIT License.

Contributions

Feel free to contribute by submitting issues or pull requests!

Happy coding! 🚀