validation: add norwegian bank account number

Author: aulonm

packages/validation/README.md

@@ -157,6 +157,19 @@ import { validateObosMembershipNumber } from '@obosbbl/validation/se';
 validateObosMembershipNumber('0000000') // => true
 ```
 
+### validateBankAccountNumber()
+
+Validates that the value is a valid organization number. Validates the checksum of the number.
+
+```js
+// 🇳🇴 example
+import { validateBankAccountNumber } from '@obosbbl/validation/no';
+validateBankAccountNumber('12345678903'); // => true
+
+// 🇸🇪 example
+// TODO: implement
+```
+
 
 ## Example usage with Zod
 

packages/validation/src/no.ts

@@ -159,3 +159,9 @@ export function validateNationalIdentityNumber(
 
   return isValidDate(year, month, day);
 }
+
+export function validateBankAccountNumber(value: string): boolean {
+  // Norwegian bank account numbers use mod 11 with one control digits.
+  // The first one is calculated for all 11 digits
+  return mod11(value, [5, 4, 3, 2, 7, 6, 5, 4, 3, 2]);
+}

packages/validation/src/validation.test.ts

@@ -47,6 +47,16 @@ describe('no', () => {
     expect(no.validateOrganizationNumber(input, options)).toBe(expected);
   });
 
+  test.each([
+    ['12345678903', true],
+    ['12345678901', false],
+    ['9523 08 20059', false],
+    ['95230820052', false],
+    ['9523.08.20059', false],
+  ])('validateAccountNumber(%s) -> %s', (input, expected) => {
+    expect(no.validateBankAccountNumber(input)).toBe(expected);
+  });
+
   test.each([
     ['1234567', true, undefined],
     // too short