@remato/personal-code-to-birthday - npm Package Compare versions

Comparing version 1.1.0 to 1.1.1

package.json

 {
 	"name": "@remato/personal-code-to-birthday",
-	"version": "1.1.0",
+	"version": "1.1.1",
 	"description": "Converts personal identification codes from various countries into birthdate",
 	"license": "MIT",
 	"main": "src/index.ts",
+	"repository": {
+		"url": "https://github.com/rematocorp/personal-code-to-birthday"
+	},
 	"scripts": {
@@ -50,3 +53,4 @@ "build": "ncc build src/index.ts",
 		]
-	}
+	},
+	"prettier": "@remato/prettier-config"
 }

src/index.test.ts

@@ -12,4 +12,5 @@ import personalCodeToBirthday from './index'
 	test('Latvia', () => {
-		expect(personalCodeToBirthday('050393-12344')).toEqual({ day: 5, month: 3, year: 1993 })
-		expect(personalCodeToBirthday('050303-22344')).toEqual({ day: 5, month: 3, year: 2003 })
+		expect(personalCodeToBirthday('240860-28074')).toEqual({ day: 24, month: 8, year: 1960 })
+		expect(personalCodeToBirthday('071023-38935')).toEqual({ day: 7, month: 10, year: 2023 })
+		expect(personalCodeToBirthday('240860-20090')).toEqual({ day: 24, month: 8, year: 1960 })
 	})
@@ -23,3 +24,2 @@
 		expect(personalCodeToBirthday('101085-7001')).toEqual({ day: 10, month: 10, year: 1985 })
-		expect(personalCodeToBirthday('101085+789W')).toEqual({ day: 10, month: 10, year: 1885 })
 		expect(personalCodeToBirthday('150752-308N')).toEqual({ day: 15, month: 7, year: 1952 })
@@ -30,13 +30,23 @@ expect(personalCodeToBirthday('010100A123D')).toEqual({ day: 1, month: 1, year: 2000 })
 	test('Sweden', () => {
-		expect(personalCodeToBirthday('199001011234')).toEqual({ day: 1, month: 1, year: 1990 })
+		expect(personalCodeToBirthday('8112289874')).toEqual({ day: 28, month: 12, year: 1981 })
+		expect(personalCodeToBirthday('811228-9874')).toEqual({ day: 28, month: 12, year: 1981 })
+		expect(personalCodeToBirthday('670919-9530')).toEqual({ day: 19, month: 9, year: 1967 })
+		expect(personalCodeToBirthday('230919-9533')).toEqual({ day: 19, month: 9, year: 2023 })
+		expect(personalCodeToBirthday('196709199530')).toEqual({ day: 19, month: 9, year: 1967 })
+		expect(personalCodeToBirthday('19670919-9530')).toEqual({ day: 19, month: 9, year: 1967 })
+		expect(personalCodeToBirthday('20230919-9533')).toEqual({ day: 19, month: 9, year: 2023 })
 	})
 
 	test('Norway', () => {
-		expect(personalCodeToBirthday('01020352345')).toEqual({ day: 1, month: 2, year: 2003 })
+		expect(personalCodeToBirthday('10021559844')).toEqual({ day: 10, month: 2, year: 2015 })
+		expect(personalCodeToBirthday('100215 59844')).toEqual({ day: 10, month: 2, year: 2015 })
+		expect(personalCodeToBirthday('10028439895')).toEqual({ day: 10, month: 2, year: 1984 })
+		expect(personalCodeToBirthday('27081439368')).toEqual({ day: 27, month: 8, year: 2014 })
 	})
 
 	test('Denmark', () => {
-		expect(personalCodeToBirthday('050305-4567')).toEqual({ day: 5, month: 3, year: 2005 })
-		expect(personalCodeToBirthday('050384-1235')).toEqual({ day: 5, month: 3, year: 1984 })
+		expect(personalCodeToBirthday('070589-8901')).toEqual({ day: 7, month: 5, year: 1989 })
+		expect(personalCodeToBirthday('230309-4456')).toEqual({ day: 23, month: 3, year: 2009 })
 		expect(personalCodeToBirthday('050384-4567')).toEqual({ day: 5, month: 3, year: 1984 })
+		expect(personalCodeToBirthday('230309-3020')).toEqual({ day: 23, month: 3, year: 1909 })
 	})
@@ -63,3 +73,4 @@
 	test('Latvia', () => {
-		expect(personalCodeToBirthday('123456-12345')).toBeNull()
+		expect(personalCodeToBirthday('071023-38934')).toBeNull()
+		expect(personalCodeToBirthday('071523-38937')).toBeNull()
 	})
@@ -79,5 +90,4 @@
 	test('Sweden', () => {
-		expect(personalCodeToBirthday('1990010123456')).toBeNull()
-		expect(personalCodeToBirthday('199013011234')).toBeNull()
-		expect(personalCodeToBirthday('199001341234')).toBeNull()
+		expect(personalCodeToBirthday('8112289875')).toBeNull()
+		expect(personalCodeToBirthday('8115289871')).toBeNull()
 	})
@@ -87,2 +97,4 @@
 		expect(personalCodeToBirthday('32129999999')).toBeNull()
+		expect(personalCodeToBirthday('32132811465')).toBeNull()
+		expect(personalCodeToBirthday('32112812600')).toBeNull()
 	})
@@ -92,6 +104,8 @@
 		expect(personalCodeToBirthday('999999-1234')).toBeNull()
+		expect(personalCodeToBirthday('051484-4569')).toBeNull()
+		expect(personalCodeToBirthday('230309-3080')).toBeNull()
 	})
 
 	test('Ukraine', () => {
-		expect(personalCodeToBirthday('3406105373')).toBeNull()
+		expect(personalCodeToBirthday('3416105373')).toBeNull()
 	})
@@ -98,0 +112,0 @@

src/index.ts

@@ -12,4 +12,6 @@ import denmarkParser from './parsers/denmark'
 export default function personalCodeToBirthday(code: string): ParsedDate | null {
+	code = code.replace(' ', '')
+
 	if (/^\d{10}$/.test(code)) {
-		return ukraineParser(code)
+		return ukraineParser(code) || swedenParser(code)
 	} else if (/^\d{11}$/.test(code)) {
@@ -23,4 +25,8 @@ return estoniaLithuaniaParser(code) || polandParser(code) || norwayParser(code)
 		return finlandParser(code)
-	} else if (/^\d{6}[+-A]\d{4}$/.test(code)) {
-		return finlandParser(code) || denmarkParser(code)
+	} else if (/^\d{6}[-]\d{4}$/.test(code)) {
+		return finlandParser(code) || swedenParser(code) || denmarkParser(code)
+	} else if (/^\d{6}[A]\d{4}$/.test(code)) {
+		return finlandParser(code)
+	} else if (/^\d{8}[-]\d{4}$/.test(code)) {
+		return swedenParser(code)
 	}
@@ -27,0 +33,0 @@

src/parsers/denmark.ts

@@ -5,5 +5,3 @@ import { ParsedDate } from '../types'
 export default function denmarkParser(code: string): ParsedDate | null {
-	if (code.includes('-')) {
-		code = code.replace('-', '')
-	}
+	code = code.replace('-', '')
 
@@ -26,2 +24,8 @@ const day = parseInt(code.slice(0, 2), 10)
 
+	// Checksum was dropped in 2007
+	// https://en.wikipedia.org/wiki/Personal_identification_number_(Denmark)#New_development_in_2007
+	if (year < 2007 && !isValidChecksum(code)) {
+		return null
+	}
+
 	if (!isValidDate(day, month, year)) {
@@ -33,1 +37,21 @@ return null
 }
+
+function isValidChecksum(code: string): boolean {
+	const weights = [4, 3, 2, 7, 6, 5, 4, 3, 2] // Weights for the first 9 digits
+
+	// Convert the first 9 digits to an array of numbers
+	const digits = code.substring(0, 9).split('').map(Number)
+
+	// Calculate the weighted sum
+	const sum = digits.reduce((acc, digit, index) => acc + digit * weights[index], 0)
+
+	// Calculate the check digit (modulo 11)
+	const checksum = sum % 11 === 0 ? 0 : 11 - (sum % 11)
+
+	// If the modulo result is 10, it's considered invalid (CPR could not use this number)
+	if (checksum === 10) {
+		return false
+	}
+
+	return checksum === parseInt(code[9], 10)
+}

src/parsers/finland.ts

@@ -17,5 +17,3 @@ import { ParsedDate } from '../types'
 	// Handle the century based on the marker
-	if (centuryMarker === '+') {
-		year += 1800
-	} else if (centuryMarker === '-') {
+	if (centuryMarker === '-') {
 		year += 1900
@@ -26,3 +24,2 @@ } else if (centuryMarker === 'A') {
 
-	// Validate the parsed date
 	if (!isValidDate(day, month, year)) {
@@ -29,0 +26,0 @@ return null

src/parsers/latvia.ts

@@ -6,9 +6,14 @@ import { ParsedDate } from '../types'
 export default function latviaParser(code: string): ParsedDate | null {
+	code = code.replace('-', '')
+
+	if (!isValidChecksum(code)) {
+		return null
+	}
+
 	const day = parseInt(code.slice(0, 2), 10)
 	const month = parseInt(code.slice(2, 4), 10)
 	let year = parseInt(code.slice(4, 6), 10)
-	const centuryCode = parseInt(code[7], 10)
+	const centuryCode = parseInt(code[6], 10)
 
-	// Latvian codes are always from the 20th century, so add 1900
-	if (centuryCode === 2) {
+	if (centuryCode === 3) {
 		year += 2000
@@ -19,3 +24,2 @@ } else {
 
-	// Validate the parsed date
 	if (!isValidDate(day, month, year)) {
@@ -27,1 +31,21 @@ return null
 }
+
+// Function to validate the check digit of a Latvian personal code
+function isValidChecksum(personalCode: string): boolean {
+	const weights = [1, 6, 3, 7, 9, 10, 5, 8, 4, 2]
+
+	// Convert the first 10 digits to an array of numbers
+	const digits = personalCode.substring(0, 10).split('').map(Number)
+
+	// Calculate the weighted sum
+	const sum = digits.reduce((acc, digit, index) => acc + digit * weights[index], 0)
+
+	// Calculate the check digit
+	let checksum = sum % 11
+	if (checksum === 10) {
+		checksum = 0 // If modulo result is 10, check digit is 0
+	}
+
+	// Return true if the calculated check digit matches the provided check digit
+	return checksum === parseInt(personalCode[10], 10)
+}

src/parsers/norway.ts

@@ -5,2 +5,6 @@ import { ParsedDate } from '../types'
 export default function norwayParser(code: string): ParsedDate | null {
+	if (!isValidChecksum(code)) {
+		return null
+	}
+
 	const day = parseInt(code.slice(0, 2), 10)
@@ -10,12 +14,11 @@ const month = parseInt(code.slice(2, 4), 10)
 
-	const individual = parseInt(code.slice(6, 9), 10)
+	const centuryMarker = parseInt(code.slice(6, 7), 10)
 
-	// Determine century based on individual number and year
-	if (individual <= 499 || (individual >= 500 && year >= 40)) {
-		year += 1900
-	} else if (individual <= 999 && year <= 39) {
+	// Read more https://en.wikipedia.org/wiki/National_identity_number_(Norway)#Numerical_components
+	if (centuryMarker <= 4 || centuryMarker === 9) {
+		year += year >= 40 ? 1900 : 2000
+	} else if (centuryMarker >= 5 && centuryMarker <= 8) {
 		year += 2000
 	}
 
-	// Now validate the date after adjusting the century
 	if (!isValidDate(day, month, year)) {
@@ -27,1 +30,39 @@ return null
 }
+
+// Function to validate the check digits of a Norwegian personal code
+function isValidChecksum(code: string): boolean {
+	const weights1 = [3, 7, 6, 1, 8, 9, 4, 5, 2] // Weights for the first checksum
+	const weights2 = [5, 4, 3, 2, 7, 6, 5, 4, 3, 2] // Weights for the second checksum, including first checksum
+
+	// Extract the first 9 digits for checksum calculation
+	const digits = code.substring(0, 9).split('').map(Number)
+
+	// Extract the check digits provided in the input
+	const providedFirstCheckDigit = parseInt(code[9], 10)
+	const providedSecondCheckDigit = parseInt(code[10], 10)
+
+	// First checksum calculation
+	const sum1 = digits.reduce((sum, digit, index) => sum + digit * weights1[index], 0)
+	let firstCheckDigit = 11 - (sum1 % 11)
+	if (firstCheckDigit === 11) {
+		firstCheckDigit = 0 // Handle special case where remainder is 11
+	}
+	if (firstCheckDigit === 10) {
+		return false // Invalid first check digit
+	}
+
+	// Add the first check digit for the second checksum calculation
+	const digitsWithFirstCheck = [...digits, firstCheckDigit]
+
+	// Second checksum calculation
+	const sum2 = digitsWithFirstCheck.reduce((sum, digit, index) => sum + digit * weights2[index], 0)
+	let secondCheckDigit = 11 - (sum2 % 11)
+	if (secondCheckDigit === 11) {
+		secondCheckDigit = 0 // Handle special case where remainder is 11
+	}
+	if (secondCheckDigit === 10) {
+		return false // Invalid second check digit
+	}
+
+	return firstCheckDigit === providedFirstCheckDigit && secondCheckDigit === providedSecondCheckDigit
+}

src/parsers/sweden.ts

@@ -5,6 +5,28 @@ import { ParsedDate } from '../types'
 export default function swedenParser(code: string): ParsedDate | null {
-	const year = parseInt(code.slice(0, 4), 10)
-	const month = parseInt(code.slice(4, 6), 10)
-	const day = parseInt(code.slice(6, 8), 10)
+	code = code.replace('-', '')
 
+	if (!isValidChecksum(code)) {
+		return null
+	}
+
+	let year: number
+	let month: number
+	let day: number
+
+	if (code.length === 12) {
+		year = parseInt(code.slice(0, 4), 10)
+		month = parseInt(code.slice(4, 6), 10)
+		day = parseInt(code.slice(6, 8), 10)
+	} else {
+		year = parseInt(code.slice(0, 2), 10)
+		month = parseInt(code.slice(2, 4), 10)
+		day = parseInt(code.slice(4, 6), 10)
+
+		if (new Date().getFullYear() - (1900 + year) > 99) {
+			year += 2000
+		} else {
+			year += 1900
+		}
+	}
+
 	if (!isValidDate(day, month, year)) {
@@ -16,1 +38,24 @@ return null
 }
+
+function isValidChecksum(code: string) {
+	// Use the last 9 digits without checksum number
+	const digits = code.length === 12 ? code.slice(2, 11) : code.slice(0, 9)
+
+	let sum = 0
+	for (let i = 0; i < digits.length; i++) {
+		let digit = parseInt(digits[i])
+
+		if (i % 2 === 0) {
+			digit *= 2
+
+			if (digit > 9) {
+				digit -= 9
+			}
+		}
+
+		sum += digit
+	}
+	const expectedChecksum = (10 - (sum % 10)) % 10
+
+	return expectedChecksum === Number(code[code.length - 1])
+}

src/parsers/ukraine.ts

 import { ParsedDate } from '../types'
+import { isValidDate } from '../utils'
 
@@ -19,2 +20,6 @@ export default function ukrainianParser(code: string): ParsedDate | null {
 
+	if (!isValidDate(day, month, year)) {
+		return null
+	}
+
 	return { day, month, year }
@@ -21,0 +26,0 @@ }

src/utils.ts

 export function isValidDate(day: number, month: number, year: number): boolean {
 	const date = new Date(year, month - 1, day) // month is zero-indexed in JS Date
 
+	if (year < 1900 || year > new Date().getFullYear()) {
+		return false
+	}
+
 	return date.getFullYear() === year && date.getMonth() === month - 1 && date.getDate() === day
 }

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Improved metrics

Total package byte prevSize

21691

increased by33.38%

Lines of code

463

increased by36.58%

Number of medium supply chain risk alerts

0

decreased by-100%

Worsened metrics

Number of package files

17

decreased by-5.56%

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