feat: add @IsISO4217CurrencyCode decorator (#1824)

Author: NoNameProvided

README.md

@@ -843,6 +843,7 @@ isBoolean(value);
 | `@IsByteLength(min: number, max?: number)`      | Checks if the string's length (in bytes) falls in a range. |
 | `@IsCreditCard()`                               | Checks if the string is a credit card. |
 | `@IsCurrency(options?: IsCurrencyOptions)`      | Checks if the string is a valid currency amount. |
+| `@IsISO4217CurrencyCode()`                      | Checks if the string is an ISO 4217 currency code. |
 | `@IsEthereumAddress()`                          | Checks if the string is an Ethereum address using basic regex. Does not validate address checksums. |
 | `@IsBtcAddress()`                               | Checks if the string is a valid BTC address. |
 | `@IsDataURI()`                                  | Checks if the string is a data uri format. |

src/decorator/decorators.ts

@@ -115,6 +115,7 @@ export * from './string/IsStrongPassword';
 export * from './string/IsTimeZone';
 export * from './string/IsBase58';
 export * from './string/is-tax-id';
+export * from './string/is-iso4217-currency-code';
 
 // -------------------------------------------------------------------------
 // Type checkers

src/decorator/string/is-iso4217-currency-code.ts

@@ -0,0 +1,31 @@
+import { ValidationOptions } from '../ValidationOptions';
+import { buildMessage, ValidateBy } from '../common/ValidateBy';
+import isISO4217Validator from 'validator/lib/isISO4217';
+
+export const IS_ISO4217_CURRENCY_CODE = 'isISO4217CurrencyCode';
+
+/**
+ * Check if the string is a valid [ISO 4217](https://en.wikipedia.org/wiki/ISO_4217) officially assigned currency code.
+ */
+export function isISO4217CurrencyCode(value: unknown): boolean {
+  return typeof value === 'string' && isISO4217Validator(value);
+}
+
+/**
+ * Check if the string is a valid [ISO 4217](https://en.wikipedia.org/wiki/ISO_4217) officially assigned currency code.
+ */
+export function IsISO4217CurrencyCode(validationOptions?: ValidationOptions): PropertyDecorator {
+  return ValidateBy(
+    {
+      name: IS_ISO4217_CURRENCY_CODE,
+      validator: {
+        validate: (value, args): boolean => isISO4217CurrencyCode(value),
+        defaultMessage: buildMessage(
+          eachPrefix => eachPrefix + '$property must be a valid ISO4217 currency code',
+          validationOptions
+        ),
+      },
+    },
+    validationOptions
+  );
+}

test/functional/validation-functions-and-decorators.spec.ts

@@ -192,6 +192,7 @@ import {
   isBase58,
   isTaxId,
   IsTaxId,
+  IsISO4217CurrencyCode,
 } from '../../src/decorator/decorators';
 import { Validator } from '../../src/validation/Validator';
 import { ValidatorOptions } from '../../src/validation/ValidatorOptions';
@@ -4730,3 +4731,20 @@ describe('IsBase58', () => {
     return checkReturnedError(new MyClass(), invalidValues, validationType, message);
   });
 });
+
+describe('IsISO4217', () => {
+  class MyClass {
+    @IsISO4217CurrencyCode()
+    someProperty: string;
+  }
+
+  it('should not fail for a valid ISO4217 code', () => {
+    const validValues = ['EUR', 'USD', 'BDT', 'LRD'];
+    return checkValidValues(new MyClass(), validValues);
+  });
+
+  it('should fail for invalid values', () => {
+    const invalidValues = [undefined, null, '', 'USS'];
+    return checkInvalidValues(new MyClass(), invalidValues);
+  });
+});