Add Dutch BBAN validation

Fixes #415

Author: Simplify

Diff for: ChangeLog

@@ -1,4 +1,8 @@
-2023-10-14  Saša Jovanić <[email protected]>
+2023-12-14  Saša Jovanić <[email protected]>
+	* Version 4.3.7
+	* Added Dutch (NL) BBAN validation
+
+2023-11-26  Saša Jovanić <[email protected]>
 	* Version 4.3.6
 
 2023-11-13  Davide Bianco <[email protected]>

Diff for: dist/ibantools.js

@@ -9,7 +9,7 @@ define(["require", "exports"], function (require, exports) {
      * @package Documentation
      * @author Saša Jovanić
      * @module ibantools
-     * @version 4.3.6
+     * @version 4.3.7
      * @license MPL-2.0
      * @preferred
      */
@@ -777,6 +777,37 @@ define(["require", "exports"], function (require, exports) {
             return controlDigitAccount === (remainder_2 === 0 ? 0 : 10 - remainder_2);
         }
     };
+    /**
+     * Dutch (NL) BBAN check
+     *
+     * @ignore
+     */
+    var checkDutchBBAN = function (bban) {
+        if (bban === '') {
+            return false;
+        }
+        var weights = [10, 9, 8, 7, 6, 5, 4, 3, 2, 1];
+        var toCheckAccount = bban.substring(4, 14);
+        if (toCheckAccount.startsWith('000')) {
+            return true;
+        }
+        if (toCheckAccount.startsWith('00')) {
+            return false;
+        }
+        var sum = toCheckAccount
+            .split('')
+            .map(function (value, index) {
+            if (value === '0' && index === 0) {
+                return 0;
+            }
+            var number = parseInt(value, 10);
+            var weight = weights[index];
+            return number * weight;
+        })
+            .reduce(function (a, b) { return a + b; });
+        console.log(sum);
+        return sum % 11 === 0;
+    };
     /**
      * Set custom BBAN validation function for country.
      *
@@ -1430,6 +1461,7 @@ define(["require", "exports"], function (require, exports) {
         NL: {
             chars: 18,
             bban_regexp: '^[A-Z]{4}[0-9]{10}$',
+            bban_validation_func: checkDutchBBAN,
             IBANRegistry: true,
             SEPA: true,
             bank_identifier: '0-3',

Diff for: package.json

@@ -1,6 +1,6 @@
 {
   "name": "ibantools",
-  "version": "4.3.6",
+  "version": "4.3.7",
   "description": "Validation, extraction and creation of IBAN, BBAN, BIC/SWIFT numbers plus some other helpful stuff like ISO 3136-1 alpha 2 country list",
   "keywords": [
     "IBAN",

Diff for: src/ibantools.ts

@@ -9,7 +9,7 @@
  * @package Documentation
  * @author Saša Jovanić
  * @module ibantools
- * @version 4.3.6
+ * @version 4.3.7
  * @license MPL-2.0
  * @preferred
  */
@@ -894,6 +894,31 @@ const checkHungarianBBAN = (bban: string): boolean => {
   }
 };
 
+/**
+ * Dutch (NL) BBAN check
+ *
+ * @ignore
+ */
+const checkDutchBBAN = (bban: string): boolean => {
+  if(bban === '') { return false; }
+
+  const weights = [10, 9, 8, 7, 6, 5, 4, 3, 2, 1];
+  const toCheckAccount = bban.substring(4, 14);
+  if(toCheckAccount.startsWith('000')) { return true; }
+  if(toCheckAccount.startsWith('00')) { return false; }
+  const sum: number = toCheckAccount
+    .split('')
+    .map((value: string, index: number) => {
+      if(value === '0' && index === 0) { return 0; }
+      const number = parseInt(value, 10);
+      const weight = weights[index];
+      return number * weight;
+    })
+    .reduce((a: number, b: number) => a + b);
+  console.log(sum);
+  return sum % 11 === 0;
+}
+
 /**
  * Set custom BBAN validation function for country.
  *
@@ -1548,6 +1573,7 @@ export const countrySpecs: CountryMapInternal = {
   NL: {
     chars: 18,
     bban_regexp: '^[A-Z]{4}[0-9]{10}$',
+    bban_validation_func: checkDutchBBAN,
     IBANRegistry: true,
     SEPA: true,
     bank_identifier: '0-3',

Diff for: test/ibantools_test.js

@@ -299,6 +299,12 @@ describe('IBANTools', function() {
     it('with valid RU IBAN should return true', function() {
       expect(iban.isValidIBAN('RU0204452560040702810412345678901')).to.be.true;
     });
+    it('with valid old Postbank Dutch IBAN should return true', function() {
+      expect(iban.isValidIBAN('NL08INGB0000000555')).to.be.true;
+    });
+    it('with invalid Dutch IBAN should return false', function() {
+      expect(iban.isValidIBAN('NL08INGB0012345555')).to.be.false;
+    });
     it('with two dots should return false', function() {
       expect(iban.isValidIBAN('..')).to.be.false;
     });
@@ -344,6 +350,7 @@ describe('IBANTools', function() {
         errorCodes: [
           iban.ValidationErrorsIBAN.WrongBBANLength,
           iban.ValidationErrorsIBAN.WrongBBANFormat,
+          iban.ValidationErrorsIBAN.WrongAccountBankBranchChecksum,
           iban.ValidationErrorsIBAN.WrongIBANChecksum,
         ],
       });
@@ -383,7 +390,8 @@ describe('IBANTools', function() {
     it('with invalid IBAN checksum should return false with correct code', function() {
       expect(iban.validateIBAN('NL91ABNA0517164300')).to.deep.equal({
         valid: false,
-        errorCodes: [iban.ValidationErrorsIBAN.WrongIBANChecksum],
+        errorCodes: [iban.ValidationErrorsIBAN.WrongAccountBankBranchChecksum,
+		     iban.ValidationErrorsIBAN.WrongIBANChecksum],
       });
     });
 
@@ -400,6 +408,7 @@ describe('IBANTools', function() {
         errorCodes: [
           iban.ValidationErrorsIBAN.WrongBBANLength,
           iban.ValidationErrorsIBAN.WrongBBANFormat,
+	  iban.ValidationErrorsIBAN.WrongAccountBankBranchChecksum,
           iban.ValidationErrorsIBAN.ChecksumNotNumber,
           iban.ValidationErrorsIBAN.WrongIBANChecksum,
         ],