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							47 lines
						
					
					
						
							959 B
						
					
					
				
			
		
		
	
	
							47 lines
						
					
					
						
							959 B
						
					
					
				| import assertString from './util/assertString'; | |
| var imeiRegexWithoutHypens = /^[0-9]{15}$/; | |
| var imeiRegexWithHypens = /^\d{2}-\d{6}-\d{6}-\d{1}$/; | |
| export default function isIMEI(str, options) { | |
|   assertString(str); | |
|   options = options || {}; // default regex for checking imei is the one without hyphens | |
|  | |
|   var imeiRegex = imeiRegexWithoutHypens; | |
| 
 | |
|   if (options.allow_hyphens) { | |
|     imeiRegex = imeiRegexWithHypens; | |
|   } | |
| 
 | |
|   if (!imeiRegex.test(str)) { | |
|     return false; | |
|   } | |
| 
 | |
|   str = str.replace(/-/g, ''); | |
|   var sum = 0, | |
|       mul = 2, | |
|       l = 14; | |
| 
 | |
|   for (var i = 0; i < l; i++) { | |
|     var digit = str.substring(l - i - 1, l - i); | |
|     var tp = parseInt(digit, 10) * mul; | |
| 
 | |
|     if (tp >= 10) { | |
|       sum += tp % 10 + 1; | |
|     } else { | |
|       sum += tp; | |
|     } | |
| 
 | |
|     if (mul === 1) { | |
|       mul += 1; | |
|     } else { | |
|       mul -= 1; | |
|     } | |
|   } | |
| 
 | |
|   var chk = (10 - sum % 10) % 10; | |
| 
 | |
|   if (chk !== parseInt(str.substring(14, 15), 10)) { | |
|     return false; | |
|   } | |
| 
 | |
|   return true; | |
| } |