isIMEI.js 949 B

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  1. import assertString from './util/assertString';
  2. var imeiRegexWithoutHypens = /^[0-9]{15}$/;
  3. var imeiRegexWithHypens = /^\d{2}-\d{6}-\d{6}-\d{1}$/;
  4. export default function isIMEI(str, options) {
  5. assertString(str);
  6. options = options || {};
  7. // default regex for checking imei is the one without hyphens
  8. var imeiRegex = imeiRegexWithoutHypens;
  9. if (options.allow_hyphens) {
  10. imeiRegex = imeiRegexWithHypens;
  11. }
  12. if (!imeiRegex.test(str)) {
  13. return false;
  14. }
  15. str = str.replace(/-/g, '');
  16. var sum = 0,
  17. mul = 2,
  18. l = 14;
  19. for (var i = 0; i < l; i++) {
  20. var digit = str.substring(l - i - 1, l - i);
  21. var tp = parseInt(digit, 10) * mul;
  22. if (tp >= 10) {
  23. sum += tp % 10 + 1;
  24. } else {
  25. sum += tp;
  26. }
  27. if (mul === 1) {
  28. mul += 1;
  29. } else {
  30. mul -= 1;
  31. }
  32. }
  33. var chk = (10 - sum % 10) % 10;
  34. if (chk !== parseInt(str.substring(14, 15), 10)) {
  35. return false;
  36. }
  37. return true;
  38. }