Captcha Generator is a Node library for quickly and easily generating captcha images that can be used through an authorized bot to verify human users on a chat platform such as Slack or Discord.

Installation

Use the package manager npm to install Captcha Generator

npm i @haileybot/captcha-generator

Usage

Basic

// Import the module
const Captcha = require("@haileybot/captcha-generator");

// Create a new Captcha object
//  - Optional argument to specify image height (250 to 400px, default 250)
//    - Image width is 400px
//  - Returned object will contain 4 properties
//    - "PNGStream" is a stream object for the image file in PNG format
//    - "JPEGStream" is a stream object for the image file in JPEG format
//    - "dataURL" is a data URL containing the JPEG image data
//    - "value" is the 6 character code the image contains
let captcha = new Captcha();
console.log(captcha.value);

Save to file example

const path = require("path"),
	fs = require("fs"),
	Captcha = require("@haileybot/captcha-generator");

let captcha = new Captcha();
captcha.PNGStream.pipe(fs.createWriteStream(path.join(__dirname, `${captcha.value}.png`)));
captcha.JPEGStream.pipe(fs.createWriteStream(path.join(__dirname, `${captcha.value}.jpeg`)));

Discord Example

This example assumes you already have the core framework of a Discord Bot set up

const Captcha = require("@haileybot/captcha-generator");

// Use this function for blocking certain commands or features from automated self-bots
function verifyHuman(msg) {
	let captcha = new Captcha();
	msg.channel.send(
		"**Enter the text shown in the image below:**",
		new Discord.MessageAttachment(captcha.JPEGStream, "captcha.jpeg")
	);
	let collector = msg.channel.createMessageCollector(m => m.author.id === msg.author.id);
	collector.on("collect", m => {
		if (m.content.toUpperCase() === captcha.value) msg.channel.send("Verified Successfully!");
		else msg.channel.send("Failed Verification!");
		collector.stop();
	});
}

License

This project is licensed under GPL-3.0