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captcha-genjs

v1.1.0

Published

Captcha generator with verification by secret key

Downloads

6

Readme

Welcome to Captcha Generator

Unfortunately, there is no Typescript support yet. If you need ES6 types and support, then please contact me, and I will do it. ;)

Initialization:

import CaptchaJs from 'captcha-genjs';

const SECRET = "ABC";
const Captcha = CaptchaJs.create(SECRET);

SECRET is required to sign the response to your captcha. Even if someone finds out your secret key, it will not be possible to find out the answer to the captcha. But the secret key will make it possible to check the correctness of the captcha.

Layout

To create a Canvas layer, you need to call the create Canvas method.

Captcha.createCanvas(150, 50);

We have just created a layer with default values of 50x150px. They are accepted by default, if you do not want to configure your captcha in detail, then using this method makes no sense.

Props

  • width - px: number;
  • height - px: number;
  • alphabet - object;
let alphabet = {
    alphabet: "ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789", // for generation
    len: 6 // len generation
};
  • color - hex, rgb: string;
  • size - px: number; font-size

Pay attention.

It is not necessary to transmit data by an object, therefore, if you want to transmit color, you need to transmit width, height and others. This is a temporary measure in future versions in plans to get rid of this ugly design.

Generate captcha

In order to generate a captcha, you need to call the appropriate method. In the method parameters, you can pass the code that will be printed on the layer. If nothing is transmitted, then a random code generated based on your alphabet and length will be printed on the layer.

let result = Captcha.generate();

Props

  • code

Return

  • url: img base64. Can use for src at html.
  • hash: string; An encrypted response to a captcha. Can be use in the client
  • code: string; The code that is printed on the picture. Use it if you need to implement your own validation.
result = {
  url: 'data:image/png;base64,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',
  hash: '4bc73e67641d302164b31d8316e421b89adb45fbb7d90a80dae2f1b5f243bd43',
  code: 'VIO4OV'
}

Validation

console.log(Captcha.checkCode(result.code, result.hash));

Props

  • code the answer to the captcha that came to you from the client
  • hash from generate

Return boolean