forked from braintree/card-validator
-
Notifications
You must be signed in to change notification settings - Fork 0
/
expiration-year.js
58 lines (46 loc) · 1.41 KB
/
expiration-year.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
var isString = require('lodash.isstring');
var maxYear = 19;
function verification(isValid, isPotentiallyValid, isCurrentYear) {
return {
isValid: isValid,
isPotentiallyValid: isPotentiallyValid,
isCurrentYear: isCurrentYear || false
};
}
function expirationYear(value) {
var currentFirstTwo, currentYear, firstTwo, len, twoDigitYear, valid, isCurrentYear;
if (!isString(value)) {
return verification(false, false);
}
if (value.replace(/\s/g, '') === '') {
return verification(false, true);
}
if (!/^\d*$/.test(value)) {
return verification(false, false);
}
len = value.length;
if (len < 2) {
return verification(false, true);
}
currentYear = new Date().getFullYear();
if (len === 3) {
// 20x === 20x
firstTwo = value.slice(0, 2);
currentFirstTwo = String(currentYear).slice(0, 2);
return verification(false, firstTwo === currentFirstTwo);
}
if (len > 4) {
return verification(false, false);
}
value = parseInt(value, 10);
twoDigitYear = Number(String(currentYear).substr(2, 2));
if (len === 2) {
isCurrentYear = twoDigitYear === value;
valid = value >= twoDigitYear && value <= twoDigitYear + maxYear;
} else if (len === 4) {
isCurrentYear = currentYear === value;
valid = value >= currentYear && value <= currentYear + maxYear;
}
return verification(valid, valid, isCurrentYear);
}
module.exports = expirationYear;