feature: allow to blacklist or whitelist country codes in the IsIBAN decorator

[spotlesscoder]

Description

I want to build an API that only accepts german IBANs for payments.

Proposed solution

Add options to the decorators that allow to either

• whitelist country codes
• blacklist country codes

Each of the two params should allow an array of ISO3166-2 country codes as strings (or maybe use an enum for TS?).

Should look something like this for the API

class MyClass {
  @IsIBAN({whitelistCountries: ["DE"]})
  germanIBAN: string;

  @IsIBAN({blacklistCountries: ["US"]})
  nonUSIBAN: string;
}

[edilson]

@CodingSpiderFox looks like in order to achieve that it would be necessary to make some changes on library that checks the IBAN.

[spotlesscoder]

I would just follow a naive approach (pseudocode)

let matchesValid = false;
whitelistCountries.forEach((country) => {
if(iban.startsWith(countryCode)) {
matchesValid = true;
}
)}

return matchesValid &&

[edilson]

Maybe for now we could use your approach whilst the lib that checks the IBAN doesn't implement this feature.

[braaar]

I suggest you resubmit this in validator.js. This library is not in the habit of augmenting validators from validator.js with custom logic unless there is a particularly strong reason for it. In the meantime you can use a custom validator for this.

[edilson]

Hey @braaar actually there's a PR opened in validator.js for that purpose, once it gets merged maybe we could implement it here.

[github-actions]

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