hahoo-captcha

A nodejs captcha module based on gm and creating random pleasing colors with PleaseJS

Install

First download and install GraphicsMagick or ImageMagick. In Mac OS X, you can simply use Homebrew and do:

brew install graphicsmagick
brew install imagemagick

then use npm:

npm install hahoo-captcha --save

Usage

save(filePath, options)

save a captcha image

import captcha from 'hahoo-captcha';

captcha.save('./captcha.png', {
  text: 'test',
  baseColor: 'skyblue'
})
.then((code) => {
  console.log(code);
})
.catch((err) => {
  console.log(err);
});

toBuffer(type, options)

return captcha image buffer

• type image type (default: png)

import http from 'http';
import captcha from 'hahoo-captcha';

http.createServer((req, res) => {
  captcha.toBuffer()
  .then((data) => {
    console.log(data.text);
    res.writeHead(200, { 'Content-Type': 'image/png' });
    res.write(data.buffer);
    res.end();
  })
  .catch((err) => {
    console.log(err);
  });
}).listen(8080);

Options

• width image width (default: 86)
• height image height (default: 38)
• background image background (default: #fff)
• text captcha text (default: random a string)
• length if text is empty, will random a string automatically, this length is the length of random string. (default: 4)
• textX left margin of text (default: 2)
• textY top margin of text (default: 31)
• baseColor the name of an HTML color(e.g. 'pink') will create a random color within the HSV range of the chosen color. if null will automatically generate a random color for captcha text.
• font font path
• fontSize font size (default: 32)
• wordWidth text word width (default: 19)
• maxSwirl the max degree of swirl (default: 20)
• lineCount the count of random line (default: 5)
• lineWidth the width of random line (default: 1)
• dotCount the count of random dot (default: 200)

This is use baseColor: 'skyblue' option (Please refer to HTML color):

License

MIT