40 lines
1022 B
JavaScript
40 lines
1022 B
JavaScript
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import assertString from './util/assertString';
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/* eslint-disable max-len */
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var creditCard = /^(?:4[0-9]{12}(?:[0-9]{3,6})?|5[1-5][0-9]{14}|(222[1-9]|22[3-9][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)[0-9]{12}|6(?:011|5[0-9][0-9])[0-9]{12,15}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11}|6[27][0-9]{14}|^(81[0-9]{14,17}))$/;
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/* eslint-enable max-len */
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export default function isCreditCard(str) {
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assertString(str);
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var sanitized = str.replace(/[- ]+/g, '');
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if (!creditCard.test(sanitized)) {
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return false;
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}
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var sum = 0;
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var digit;
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var tmpNum;
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var shouldDouble;
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for (var i = sanitized.length - 1; i >= 0; i--) {
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digit = sanitized.substring(i, i + 1);
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tmpNum = parseInt(digit, 10);
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if (shouldDouble) {
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tmpNum *= 2;
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if (tmpNum >= 10) {
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sum += tmpNum % 10 + 1;
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} else {
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sum += tmpNum;
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}
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} else {
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sum += tmpNum;
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}
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shouldDouble = !shouldDouble;
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}
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return !!(sum % 10 === 0 ? sanitized : false);
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}
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