add kontrollsiffer validation for norwegian national identifiers

src/layout/PersonLookup/PersonLookupComponent.tsx

@@ -61,7 +61,6 @@ async function fetchPerson({
     if (error.response.status === 403) {
       return { person: null, error: 'person_lookup.validation_error_forbidden' };
     }
-    // TODO: expose this status from app-lib?
     if (error.response.status === 429) {
       return { person: null, error: 'person_lookup.validation_error_too_many_requests' };
     }

src/layout/PersonLookup/validation.test.ts

@@ -0,0 +1,13 @@
+import { checkValidSsn } from 'src/layout/PersonLookup/validation';
+
+describe('checkValidSsn', () => {
+  it('should return true with valid ssn', () => {
+    expect(checkValidSsn('13014013525')).toBe(true);
+  }),
+    it('should return false with invalid ssn', () => {
+      expect(checkValidSsn('11017512345')).toBe(false);
+    }),
+    it('should return true with a tenor user', () => {
+      expect(checkValidSsn('66877400531')).toBe(true);
+    });
+});

src/layout/PersonLookup/validation.ts

@@ -6,29 +6,42 @@ import type { Person, PersonLookupResponse } from 'src/layout/PersonLookup/Perso
 const ajv = new Ajv({ allErrors: true });
 addErrors(ajv);
 
-/**
- * @see https://github.com/navikt/k9-punsj-frontend/blob/435a445a14797dee5c19fb1c1a70c323c3f4187c/src/app/rules/IdentRules.ts
- */
-const REGEX_FNR =
-  /^((((0[1-9]|[12]\d|30)(0[469]|11)|(0[1-9]|[12]\d|3[01])(0[13578]|1[02])|((0[1-9]|1\d|2[0-8])02))\d{2})|2902([02468][048]|[13579][26]))\d{5}$/;
-/**
- * @see https://github.com/navikt/k9-punsj-frontend/blob/435a445a14797dee5c19fb1c1a70c323c3f4187c/src/app/rules/IdentRules.ts
- */
-const REGEX_DNR =
-  /^((((4[1-9]|[56]\d|70)(0[469]|11)|(4[1-9]|[56]\d|7[01])(0[13578]|1[02])|((4[1-9]|5\d|6[0-8])02))\d{2})|6902([02468][048]|[13579][26]))\d{5}$/;
+ajv.addKeyword({
+  keyword: 'isValidSsn',
+  type: 'string',
+  validate: (_, data: string) => {
+    if (typeof data !== 'string') {
+      return false;
+    }
+
+    return checkValidSsn(data);
+  },
+});
 
 const ssnSchema: JSONSchemaType<Pick<Person, 'ssn'>> = {
   type: 'object',
   properties: {
     ssn: {
       type: 'string',
-      pattern: new RegExp(`((${REGEX_FNR.source}))|((${REGEX_DNR.source}))`).source,
+      isValidSsn: true,
       errorMessage: 'person_lookup.validation_error_ssn',
     },
   },
   required: ['ssn'],
 };
 
+export function checkValidSsn(ssn: string): boolean {
+  if (ssn.length !== 11) {
+    return false;
+  }
+  const [d1, d2, m1, m2, y1, y2, i1, i2, i3, k1, k2] = ssn.split('').map(Number);
+  const calculated_k1 = 11 - ((3 * d1 + 7 * d2 + 6 * m1 + 1 * m2 + 8 * y1 + 9 * y2 + 4 * i1 + 5 * i2 + 2 * i3) % 11);
+  const calculated_k2 =
+    11 - ((5 * d1 + 4 * d2 + 3 * m1 + 2 * m2 + 7 * y1 + 6 * y2 + 5 * i1 + 4 * i2 + 3 * i3 + 2 * calculated_k1) % 11);
+
+  return k1 === calculated_k1 && k2 === calculated_k2;
+}
+
 const nameSchema: JSONSchemaType<Pick<Person, 'name'>> = {
   type: 'object',
   properties: {