card-validator
Version:
A library for validating credit card fields
59 lines (58 loc) • 1.99 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.expirationYear = void 0;
var DEFAULT_VALID_NUMBER_OF_YEARS_IN_THE_FUTURE = 19;
function verification(isValid, isPotentiallyValid, isCurrentYear) {
return {
isValid: isValid,
isPotentiallyValid: isPotentiallyValid,
isCurrentYear: isCurrentYear || false,
};
}
function expirationYear(value, maxElapsedYear) {
if (maxElapsedYear === void 0) { maxElapsedYear = DEFAULT_VALID_NUMBER_OF_YEARS_IN_THE_FUTURE; }
var isCurrentYear;
if (typeof value !== "string") {
return verification(false, false);
}
if (value.replace(/\s/g, "") === "") {
return verification(false, true);
}
if (!/^\d*$/.test(value)) {
return verification(false, false);
}
var len = value.length;
if (len < 2) {
return verification(false, true);
}
var currentYear = new Date().getFullYear();
if (len === 3) {
// 20x === 20x
var firstTwo = value.slice(0, 2);
var currentFirstTwo = String(currentYear).slice(0, 2);
return verification(false, firstTwo === currentFirstTwo);
}
if (len > 4) {
return verification(false, false);
}
var numericValue = parseInt(value, 10);
var twoDigitYear = Number(String(currentYear).substr(2, 2));
var valid = false;
if (len === 2) {
if (String(currentYear).substr(0, 2) === value) {
return verification(false, true);
}
isCurrentYear = twoDigitYear === numericValue;
valid =
numericValue >= twoDigitYear &&
numericValue <= twoDigitYear + maxElapsedYear;
}
else if (len === 4) {
isCurrentYear = currentYear === numericValue;
valid =
numericValue >= currentYear &&
numericValue <= currentYear + maxElapsedYear;
}
return verification(valid, valid, isCurrentYear);
}
exports.expirationYear = expirationYear;