npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

card-swipe

v1.1.0

Published

A utility for detecting CC track inputs from streaming character data and extracting data from them

Downloads

52

Readme

card-swipe.js

NPM version npm Travis

A utility for detecting CC track inputs from streaming character data and for extracting data from them.

A credit card magstripe contains a string of data representing a composite of account details. A 'card present' transaction (which gives you a better retail percentage on your transaction fees) generally consists of setting a flag and passing along this data, which has strict regulations on them preventing them from ever being saved to disk. Normally a magstripe is just a keyboard as far as the OS knows, which often leads to tedious PC POS interfaces where you click into a field and then swipe the card, your other option is to build an input sniffer which allows you to scan time restricted character buffers for track data patterns, so you can react/generate events/whatever. So that's what this is, you plug keystroke input into it, it reacts whenever it sees a cardswipe. In addition it can use bin ranges on the account number to determine account type and issuer.

Usage

require the library

var Swipe = require('card-swipe');

the simplest way to get it running is to use the built-in stdio hook to get it running from the terminal:

Swipe.stdIn()
new Swipe(function(swipeData){
    console.log('swipe', swipeData);
});

this is the shorthand for:

var scanner = new Swipe.Scanner();
new Swipe({
    scanner : scanner,
    onSwipe : function(swipeData){
        console.log('swipe', swipeData);
    }
});
process.stdin.setRawMode();
process.stdin.resume();
process.stdin.on('data', function (chunk, key) {
    chunk = chunk.toString();
    for(var lcv=0; lcv < chunk.length; lcv++) scanner.input(chunk[lcv]);
    if (key && key.ctrl && key.name == 'c') process.exit();
});

likely if you are integrating this into an app, stdin is not going to be good enough for you... but luckily the scanner will wire up to just about anything.

Additionally, so I could test these things out I built a generator function

Swipe.generate(field, [values])

which can generate luhn and bin valid account numbers, track_one and track_two data (since you can't really be saving these things, and test cards are continually expiring).

and for my testing harness

Swipe.fake(scanner)

which generates a random fake swipe across the passed in scanner.

Browser Example - Vue Component

<template>
    <div class="swipe">
        <slot></slot>
    </div>
</template>

<script>
    import * as Swipe from 'card-swipe';

    export default {
        name: 'CardSwipe',
        methods : {
          handleSwipe : function(swipe){
              console.log('CHAR', swipe);
          }
        },
        created: function(){
            window.addEventListener('keydown', (e)=>{
                if(e.key.length === 1) scanner.input(e.key);
                //if(e.key === 'Enter') scanner.input("\n");
            });
            let scanner = new Swipe.Scanner();
            new Swipe({
                scanner : scanner,
                onScan : (swipeData)=>{
                    this.handleSwipe(swipeData);
                    console.log('swipe', swipeData);
                }
            });
        }
    }
</script>
<style scoped></style>

Testing

Tests use mocha/should to execute the tests from root

mocha

If you find any rough edges, please submit a bug!

Right now this only supports credit cards, but this could easily expand to gift cards, EBT, checks, etc. If you have a specific interest, contact me.

Enjoy,

-Abbey Hawk Sparrow