Added finnish id card validator

Author: Marcholio

README.md

@@ -115,7 +115,7 @@ Validator                               | Description
 **isHexColor(str)**                     | check if the string is a hexadecimal color.
 **isHSL(str)**                          | check if the string is an HSL (hue, saturation, lightness, optional alpha) color based on [CSS Colors Level 4 specification](https://developer.mozilla.org/en-US/docs/Web/CSS/color_value).<br/><br/>Comma-separated format supported. Space-separated format supported with the exception of a few edge cases (ex: `hsl(200grad+.1%62%/1)`).
 **isIBAN(str)**                         | check if a string is a IBAN (International Bank Account Number).
-**isIdentityCard(str [, locale])**      | check if the string is a valid identity card code.<br/><br/>`locale` is one of `['PL', 'ES', 'IN', 'IT', 'IR', 'MZ', 'NO', 'TH', 'zh-TW', 'he-IL', 'ar-LY', 'ar-TN', 'zh-CN']` OR `'any'`. If 'any' is used, function will check if any of the locals match.<br/><br/>Defaults to 'any'.
+**isIdentityCard(str [, locale])**      | check if the string is a valid identity card code.<br/><br/>`locale` is one of `['PL', 'ES', 'FI', IN', 'IT', 'IR', 'MZ', 'NO', 'TH', 'zh-TW', 'he-IL', 'ar-LY', 'ar-TN', 'zh-CN']` OR `'any'`. If 'any' is used, function will check if any of the locals match.<br/><br/>Defaults to 'any'.
 **isIMEI(str [, options]))**                         | check if the string is a valid IMEI number. Imei should be of format `###############` or `##-######-######-#`.<br/><br/>`options` is an object which can contain the keys `allow_hyphens`. Defaults to first format . If allow_hyphens is set to true, the validator will validate the second format.
 **isIn(str, values)**                   | check if the string is in a array of allowed values.
 **isInt(str [, options])**              | check if the string is an integer.<br/><br/>`options` is an object which can contain the keys `min` and/or `max` to check the integer is within boundaries (e.g. `{ min: 10, max: 99 }`). `options` can also contain the key `allow_leading_zeroes`, which when set to false will disallow integer values with leading zeroes (e.g. `{ allow_leading_zeroes: false }`). Finally, `options` can contain the keys `gt` and/or `lt` which will enforce integers being greater than or less than, respectively, the value provided (e.g. `{gt: 1, lt: 4}` for a number between 1 and 4).

src/lib/isIdentityCard.js

@@ -63,6 +63,26 @@ const validators = {
 
     return sanitized.endsWith(controlDigits[number % 23]);
   },
+  FI: (str) => {
+    // https://dvv.fi/en/personal-identity-code#:~:text=control%20character%20for%20a-,personal,-identity%20code%20calculated
+    assertString(str);
+
+    if (str.length !== 11) {
+      return false;
+    }
+
+    if (!str.match(/^\d{6}[\-A\+]\d{3}[0-9ABCDEFHJKLMNPRSTUVWXY]{1}$/)) {
+      return false;
+    }
+
+    const checkDigits = '0123456789ABCDEFHJKLMNPRSTUVWXY';
+
+    const idAsNumber = (parseInt(str.slice(0, 6), 10) * 1000) + parseInt(str.slice(7, 10), 10);
+    const remainder = idAsNumber % 31;
+    const checkDigit = checkDigits[remainder];
+
+    return checkDigit === str.slice(10, 11);
+  },
   IN: (str) => {
     const DNI = /^[1-9]\d{3}\s?\d{4}\s?\d{4}$/;
 

test/validators.js

@@ -4739,6 +4739,20 @@ describe('Validators', () => {
           'Z1234567C',
         ],
       },
+      {
+        locale: 'FI',
+        valid: [
+          '131052-308T', // People born in 1900s
+          '131052A308T', // People born in 2000s
+          '131052+308T', // People born in 1800s
+          '131052-313Y',
+        ],
+        invalid: [
+          '131052308T',
+          '131052-308T ',
+          '131052-308A',
+        ],
+      },
       {
         locale: 'IN',
         valid: [