trackparser.js

// /////////////////////////////////////////////////////////////////////////////////
// JavaScript Magstripe (track 1, track2) data parser object
//
// Mar-22-2005      Modified by Wayne Walrath,
//                  Acme Technologies http://www.acmetech.com
//                  based on demo source code from www.skipjack.com
//
// Aug-12-2016      Modified by Juan G Ruelas Jr,
//                  Ruelas Industries
//                  Published to npm under username ChannelJuanNews
//                  Found on github under https://github.com/channeljuannews/trackParser
//                  Other uses can be found on www.ruelas.me/trackparser
//
//  ** NEW USAGE **
//
//  var trackData = new trackParser(/*Raw String Here*/)
//  trackData.firstName
//  trackData.lastName
//  trackData.account
//  trackData.expMonth
//  trackdata.expYear
//
///////////////////////////////////////////////////////////////////////////////////




var trackParser = function(strParse) {

    // we error check
    if (strParse == "" || strParse == null || strParse == undefined){
        console.log("There was no data passed to the constructor")
        return
    }

    ///////////////////// member variables ////////////////////////
    this.input_trackdata_str    = strParse;
    this.account_name           = null;
    this.lastName                = null;
    this.firstName              = null;
    this.account               = null;
    this.expMonth              = null;
    this.expYear               = null;
    this.track1                 = null;
    this.track2                 = null;
    this.hasTrack1              = false;
    this.hasTrack2              = false;
    /////////////////////////// end member fields /////////////////


    sTrackData = this.input_trackdata_str;     //--- Get the track data

    //-- Example: Track 1 & 2 Data
    //-- %B1234123412341234^CardUser/John^030510100000019301000000877000000?;1234123412341234=0305101193010877?
    //-- Key off of the presence of "^" and "="

    //-- Example: Track 1 Data Only
    //-- B1234123412341234^CardUser/John^030510100000019301000000877000000?
    //-- Key off of the presence of "^" but not "="

    //-- Example: Track 2 Data Only
    //-- 1234123412341234=0305101193010877?
    //-- Key off of the presence of "=" but not "^"

    if ( strParse != '' ) {
    // alert(strParse);

    //--- Determine the presence of special characters
    nHasTrack1 = strParse.indexOf("^");
    nHasTrack2 = strParse.indexOf("=");

    //--- Set boolean values based off of character presence
    this.hasTrack1 = bHasTrack1 = false;
    this.hasTrack2 = bHasTrack2 = false;
    if (nHasTrack1 > 0) { this.hasTrack1 = bHasTrack1 = true; }
    if (nHasTrack2 > 0) { this.hasTrack2 = bHasTrack2 = true; }

    //--- Test messages
    // alert('nHasTrack1: ' + nHasTrack1 + ' nHasTrack2: ' + nHasTrack2);
    // alert('bHasTrack1: ' + bHasTrack1 + ' bHasTrack2: ' + bHasTrack2);

    //--- Initialize
    bTrack1_2  = false;
    bTrack1    = false;
    bTrack2    = false;

    //--- Determine tracks present
    if (( bHasTrack1) && ( bHasTrack2)) { bTrack1_2 = true; }
    if (( bHasTrack1) && (!bHasTrack2)) { bTrack1   = true; }
    if ((!bHasTrack1) && ( bHasTrack2)) { bTrack2   = true; }

    //--- Test messages
    // alert('bTrack1_2: ' + bTrack1_2 + ' bTrack1: ' + bTrack1 + ' bTrack2: ' + bTrack2);

    //--- Initialize alert message on error
    bShowAlert = false;

    //-----------------------------------------------------------------------------
    //--- Track 1 & 2 cards
    //--- Ex: B1234123412341234^CardUser/John^030510100000019301000000877000000?;1234123412341234=0305101193010877?
    //-----------------------------------------------------------------------------
    if (bTrack1_2) {
        //console.log('Track 1 & 2 swipe');

        strCutUpSwipe = '' + strParse + ' ';
        arrayStrSwipe = new Array(4);
        arrayStrSwipe = strCutUpSwipe.split("^");

        var sAccountNumber, sName, sShipToName, sMonth, sYear;

        if ( arrayStrSwipe.length > 2 ) {
            this.account        = stripAlpha( arrayStrSwipe[0].substring(1,arrayStrSwipe[0].length) );
            this.account_name   = arrayStrSwipe[1];
            this.expMonth      = arrayStrSwipe[2].substring(2,4);
            this.expYear       = '20' + arrayStrSwipe[2].substring(0,2);

            //--- Different card swipe readers include or exclude the % in the front of the track data - when it's there, there are
            //---   problems with parsing on the part of credit cards processor - so strip it off
            if ( sTrackData.substring(0,1) == '%' ) {
                sTrackData = sTrackData.substring(1,sTrackData.length);
            }

            var track2sentinel = sTrackData.indexOf(";");
            if( track2sentinel != -1 ){
               this.track1 = sTrackData.substring(0, track2sentinel);
               this.track2 = sTrackData.substring(track2sentinel);
            }
            //--- parse name field into first/last names
            var nameDelim = this.account_name.indexOf("/");
            if( nameDelim != -1 ){
                this.lastName = this.account_name.substring(0, nameDelim);
                this.firstName = this.account_name.substring(nameDelim+1);
            }
        }
        else { //--- for "if ( arrayStrSwipe.length > 2 )"
            //console.log('There was an error reading the card')
            bShowAlert = true;  //--- Error -- show alert message
        }
    }

    //-----------------------------------------------------------------------------
    //--- Track 1 only cards
    //--- Ex: B1234123412341234^CardUser/John^030510100000019301000000877000000?
    //-----------------------------------------------------------------------------
    if (bTrack1) {
        //console.log('Track 1 swipe');

        strCutUpSwipe = '' + strParse + ' ';
        arrayStrSwipe = new Array(4);
        arrayStrSwipe = strCutUpSwipe.split("^");

        var sAccountNumber, sName, sShipToName, sMonth, sYear;

        if ( arrayStrSwipe.length > 2 ) {

            this.account        = sAccountNumber    = stripAlpha( arrayStrSwipe[0].substring( 1,arrayStrSwipe[0].length) );
            this.account_name   = sName             = arrayStrSwipe[1];
            this.expMonth      = sMonth            = arrayStrSwipe[2].substring(2,4);
            this.expYear       = sYear             = '20' + arrayStrSwipe[2].substring(0,2);


            //--- Different card swipe readers include or exclude the % in
            //--- the front of the track data - when it's there, there are
            //---   problems with parsing on the part of credit cards processor - so strip it off
            if ( sTrackData.substring(0,1) == '%' ) {
                this.track1 = sTrackData = sTrackData.substring(1,sTrackData.length);
            }

            //--- Add track 2 data to the string for processing reasons
            //        if (sTrackData.substring(sTrackData.length-1,1) != '?')  //--- Add a ? if not present
            //        { sTrackData = sTrackData + '?'; }
            this.track2 = ';' + sAccountNumber + '=' + sYear.substring(2,4) + sMonth + '111111111111?';
            sTrackData = sTrackData + this.track2;

            //--- parse name field into first/last names
            var nameDelim = this.account_name.indexOf("/");
            if( nameDelim != -1 ){
                this.lastName = this.account_name.substring(0, nameDelim);
                this.firstName = this.account_name.substring(nameDelim+1);
            }

        }
        else { //--- for "if ( arrayStrSwipe.length > 2 )"
            //console.log('There was an error reading the card')
            bShowAlert = true;  //--- Error -- show alert message
        }
    }

    //-----------------------------------------------------------------------------
    //--- Track 2 only cards
    //--- Ex: 1234123412341234=0305101193010877?
    //-----------------------------------------------------------------------------
    if (bTrack2) {
        //console.log('Track 2 swipe');

        nSeperator  = strParse.indexOf("=");
        sCardNumber = strParse.substring(1,nSeperator);
        sYear       = strParse.substr(nSeperator+1,2);
        sMonth      = strParse.substr(nSeperator+3,2);

        // console.log(sCardNumber + ' -- ' + sMonth + '/' + sYear);

        this.account    = sAccountNumber    = stripAlpha(sCardNumber);
        this.expMonth  = sMonth            = sMonth;
        this.expYear   = sYear             = '20' + sYear;

        //--- Different card swipe readers include or exclude the % in the front of the track data - when it's there,
        //---  there are problems with parsing on the part of credit cards processor - so strip it off
        if ( sTrackData.substring(0,1) == '%' ) {
            sTrackData = sTrackData.substring(1,sTrackData.length);
        }

    }

    //-----------------------------------------------------------------------------
    //--- No Track Match
    //-----------------------------------------------------------------------------
    if (((!bTrack1_2) && (!bTrack1) && (!bTrack2)) || (bShowAlert)) {
      console.log('Difficulty Reading Card Information.\n\nPlease Swipe Card Again.');
    }


    //document.formFinal.trackdata.value = replaceChars(document.formFinal.trackdata.value,';','');
    //document.formFinal.trackdata.value = replaceChars(document.formFinal.trackdata.value,'?','');


    } //--- end "if ( strParse != '' )"


    this.dump = function(){
        var s = "";
        var sep = "\r"; // line separator
        s += "Name: " + this.account_name + sep;
        s += "lastName: " + this.lastName + sep;
        s += "first name: " + this.firstName + sep;
        s += "account: " + this.account + sep;
        s += "expMonth: " + this.expMonth + sep;
        s += "expYear: " + this.expYear + sep;
        s += "has track1: " + this.hasTrack1 + sep;
        s += "has track2: " + this.hasTrack2 + sep;
        s += "TRACK 1: " + this.track1 + sep;
        s += "TRACK 2: " + this.track2 + sep;
        s += "Raw Input Str: " + this.input_trackdata_str + sep;

        return s;
    }

    function stripAlpha(sInput){
        if( sInput == null )    return '';
        return sInput.replace(/[^0-9]/g, '');
    }

}

module.exports = trackParser