Software company albania
Header

Client side Credit Card check

September 26th, 2013 | Posted by hedvir in Application Security | tricks

Hello developers!

There are may times that we have to deal with online credit card payments.

Well there is a simple solution for dummy front end users that we can check their credit cards before we validate are going to validate it in server side and then in the credit card processor…

Below is following the modified code taken from http://www.braemoor.co.uk/software/creditcard.shtml :

FILE: http://www.braemoor.co.uk/software/creditcard.shtml WAS UPDATED for The Revealing Module Pattern FOR BETTER CODE MAINTAINING .

There are also some other additional properties according to original file.

 

/**
* Created with JetBrains PhpStorm.
* User: Edvir Hysenllari
* Date: 4/25/13
* Time: 10:00 AM
* To change this template use File | Settings | File Templates.
*
* THIS FILE: http://www.braemoor.co.uk/software/creditcard.shtml WAS UPDATED The Revealing Module Pattern FOR BETTER CODE MANTAINING
* There are some other additional properties according to original file.
*
* Below is the original file comment and usage example, modified for this version.
*
*
* Feel free to use it.
*
*/

/*================================================================================================*/

/*

This routine checks the credit card number. The following checks are made:

1. A number has been provided
2. The number is a right length for the card
3. The number has an appropriate prefix for the card
4. The number has a valid modulus 10 number check digit if required

If the validation fails an error is reported.

The structure of credit card formats was gleaned from a variety of sources on the web, although the
best is probably on Wikepedia ("Credit card number"):

http://en.wikipedia.org/wiki/Credit_card_number

Parameters:
cardnumber number on the card
cardname name of card as defined in the card list below

Author: John Gardner
Date: 1st November 2003
Updated: 26th Feb. 2005 Additional cards added by request
Updated: 27th Nov. 2006 Additional cards added from Wikipedia
Updated: 18th Jan. 2008 Additional cards added from Wikipedia
Updated: 26th Nov. 2008 Maestro cards extended
Updated: 19th Jun. 2009 Laser cards extended from Wikipedia
Updated: 11th Sep. 2010 Typos removed from Diners and Solo definitions (thanks to Noe Leon)
Updated: 10th April 2012 New matches for Maestro, Diners Enroute and Switch
Updated: 17th October 2012 Diners Club prefix 38 not encoded

*/

/*
If a credit card number is invalid, an error reason is loaded into the global ccErrorNo variable.
This can be be used to index into the global error string array to report the reason to the user
if required:

e.g. if (!checkCreditCard (number, name) alert (ccErrors(ccErrorNo);
*/

/**
*
* Usage:
*
* 1. If you have a select box that will contain credit card names you can use: var myCC = EH_CCCheck.eh_getCC(); to hold credit card objects
* and put them in option element as follows: <option value="cc[0].name"> cc[0].display_name </option>. ...
*
* 2. To check the credit card: var cc = EH_CCCheck.eh_ccchek('4111 1111 1111 1111', 'Visa');
* cc variable will be true or false so for later user you have to show the error type and use it to display as you wish
*
* 3. To get the error type if is false: EH_CCCheck.eh_getError();
*
* example: var ccs = EH_CCCheck.eh_getCC(); //get the credit cards
var cc = EH_CCCheck.eh_ccchek('4111 1111 1111 1111', 'Visa');
if (cc) {
alert ("Credit card has a valid format")
}else {
alert (EH_CCCheck.eh_getError())
};
*
**/

var EH_CCCheck = function(){

var ccErrorNo = 0;
var ccErrors = new Array ()

ccErrors [0] = "Unknown card type";
ccErrors [1] = "No card number provided";
ccErrors [2] = "Credit card number is in invalid format";
ccErrors [3] = "Credit card number is invalid";
ccErrors [4] = "Credit card number has an inappropriate number of digits";
ccErrors [5] = "Warning! This credit card number is associated with a scam attempt";

// Array to hold the permitted card characteristics
var cards = new Array();

// Define the cards we support. You may add addtional card types as follows.

// Name: As in the selection box of the form - must be same as user's
// Length: List of possible valid lengths of the card number for the card
// prefixes: List of possible prefixes for the card
// checkdigit: Boolean to say whether there is a check digit

cards [0] = { display_name:"American Express",
name: "AmEx",
length: "15",
prefixes: "34,37",
checkdigit: true};

cards [1] = { display_name:"Carte Blanche",
name: "CarteBlanche",
length: "14",
prefixes: "300,301,302,303,304,305",
checkdigit: true};

cards [2] = { display_name:"Diners Club",
name: "DinersClub",
length: "14,16",
prefixes: "36,38,54,55",
checkdigit: true};

cards [3] = { display_name:"Discover",
name: "Discover",
length: "16",
prefixes: "6011,622,64,65",
checkdigit: true};

cards [4] = { display_name:"EnRoute",
name: "enRoute",
length: "15",
prefixes: "2014,2149",
checkdigit: true};

cards [5] = { display_name:"JCB",
name: "JCB",
length: "16",
prefixes: "35",
checkdigit: true};

cards [6] = { display_name:"Maestro",
name: "Maestro",
length: "12,13,14,15,16,18,19",
prefixes: "5018,5020,5038,6304,6759,6761,6762,6763",
checkdigit: true};

cards [7] = { display_name:"MasterCard",
name: "MasterCard",
length: "16",
prefixes: "51,52,53,54,55",
checkdigit: true};

cards [8] = { display_name:"Solo",
name: "Solo",
length: "16,18,19",
prefixes: "6334,6767",
checkdigit: true};

cards [9] = { display_name:"Switch",
name: "Switch",
length: "16,18,19",
prefixes: "4903,4905,4911,4936,564182,633110,6333,6759",
checkdigit: true};

cards [10] = { display_name:"Visa",
name: "Visa",
length: "13,16",
prefixes: "4",
checkdigit: true};

cards [11] = { display_name:"Visa Electron",
name: "VisaElectron",
length: "16",
prefixes: "4026,417500,4508,4844,4913,4917",
checkdigit: true};

cards [12] = { display_name:"Laser Card",
name: "LaserCard",
length: "16,17,18,19",
prefixes: "6304,6706,6771,6709",
checkdigit: true};

// Establish card type
var cardType = -1;

function checkCreditCard (cardnumber, cardname) {

for (var i=0; i < cards.length; i++) {

// See if it is this card (ignoring the case of the string)
if (cardname.toLowerCase () == cards[i].name.toLowerCase()) {
cardType = i;
break;
}
}

// If card type not found, report an error
if (cardType == -1) {
ccErrorNo = 0;
return false;
}

// Ensure that the user has provided a credit card number
if (cardnumber.length == 0) {
ccErrorNo = 1;
return false;
}

// Now remove any spaces from the credit card number
cardnumber = cardnumber.replace (/\s/g, "");

// Check that the number is numeric
var cardNo = cardnumber
var cardexp = /^[0-9]{13,19}$/;
if (!cardexp.exec(cardNo)) {
ccErrorNo = 2;
return false;
}

// Now check the modulus 10 check digit - if required
if (cards[cardType].checkdigit) {
var checksum = 0; // running checksum total
var mychar = ""; // next char to process
var j = 1; // takes value of 1 or 2

// Process each digit one by one starting at the right
var calc;
for (i = cardNo.length - 1; i >= 0; i--) {

// Extract the next digit and multiply by 1 or 2 on alternative digits.
calc = Number(cardNo.charAt(i)) * j;

// If the result is in two digits add 1 to the checksum total
if (calc > 9) {
checksum = checksum + 1;
calc = calc - 10;
}

// Add the units element to the checksum total
checksum = checksum + calc;

// Switch the value of j
if (j ==1) {j = 2} else {j = 1};
}

// All done - if checksum is divisible by 10, it is a valid modulus 10.
// If not, report an error.
if (checksum % 10 != 0) {
ccErrorNo = 3;
return false;
}
}

// Check it's not a spam number
if (cardNo == '5490997771092064') {
ccErrorNo = 5;
return false;
}

// The following are the card-specific checks we undertake.
var LengthValid = false;
var PrefixValid = false;
var undefined;

// We use these for holding the valid lengths and prefixes of a card type
var prefix = new Array ();
var lengths = new Array ();

// Load an array with the valid prefixes for this card
prefix = cards[cardType].prefixes.split(",");

// Now see if any of them match what we have in the card number
for (i=0; i<prefix.length; i++) {
var exp = new RegExp ("^" + prefix[i]);
if (exp.test (cardNo)) PrefixValid = true;
}

// If it isn't a valid prefix there's no point at looking at the length
if (!PrefixValid) {
ccErrorNo = 3;
return false;
}

// See if the length is valid for this card
lengths = cards[cardType].length.split(",");
for (j=0; j<lengths.length; j++) {
if (cardNo.length == lengths[j]) LengthValid = true;
}

// See if all is OK by seeing if the length was valid. We only check the length if all else was
// hunky dory.
if (!LengthValid) {
ccErrorNo = 4;
return false;
};

// The credit card is in the required format.
return true;
}

function getCreditCards(){
return cards;
}

function getErrors(){
return ccErrors[ccErrorNo];
}

return {
eh_ccchek: checkCreditCard,
eh_getError: getErrors,
eh_getCC: getCreditCards
};

}();

Below is the link to github.

Feel free to use it, keep calm, and check your CC like a boss…

https://github.com/hedvir/EH-Javascript-Credit-Card-Ceck/

 

 

 

 

 

 

 

 

 

 

 

 

You can follow any responses to this entry through the RSS 2.0 You can skip to the end and leave a response. Pinging is currently not allowed.

Leave a Reply

Your email address will not be published. Required fields are marked *


*

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>

Current ye@r *