nip24client/lib/euvat.js

NIP24 Client for JavaScript

/**
 * Copyright 2015-2025 NETCAT (www.netcat.pl)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @author NETCAT <firma@netcat.pl>
 * @copyright 2015-2025 NETCAT (www.netcat.pl)
 * @license http://www.apache.org/licenses/LICENSE-2.0
 */


'use strict';

const NIP = require('./nip');

/**
 * Normalizes form of the NIP number
 * @param {string} number input string
 * @return {string} normalized number
 */
function normalize(number)
{
	if (!number) {
		return undefined;
	}

	number = number.replace(/[ -]/g, '').trim().toUpperCase();

	if (number.search(/^[A-Z]{2}[A-Z0-9+*]{2,12}$/) === -1) {
		return undefined;
	}

	return number;
}

/**
 * Checks if specified NIP is valid
 * @param {string} number input number
 * @return {boolean} true if number is valid
 */
function isValid(number)
{
	if (!(number = normalize(number))) {
		return false;
	}

	const map = {
		'AT': /^ATU\d{8}$/,
		'BE': /^BE[0-1]{1}\d{9}$/,
		'BG': /^BG\d{9,10}$/,
		'CY': /^CY\d{8}[A-Z]{1}$/,
		'CZ': /^CZ\d{8,10}$/,
		'DE': /^DE\d{9}$/,
		'DK': /^DK\d{8}$/,
		'EE': /^EE\d{9}$/,
		'EL': /^EL\d{9}$/,
		'ES': /^ES[A-Z0-9]{1}\d{7}[A-Z0-9]{1}$/,
		'FI': /^FI\d{8}$/,
		'FR': /^FR[A-Z0-9]{2}\d{9}$/,
		'HR': /^HR\d{11}$/,
		'HU': /^HU\d{8}$/,
		'IE': /^IE[A-Z0-9+*]{8,9}$/,
		'IT': /^IT\d{11}$/,
		'LT': /^LT\d{9,12}$/,
		'LU': /^LU\d{8}$/,
		'LV': /^LV\d{11}$/,
		'MT': /^MT\d{8}$/,
		'NL': /^NL[A-Z0-9+*]{12}$/,
		'PL': /^PL\d{10}$/,
		'PT': /^PT\d{9}$/,
		'RO': /^RO\d{2,10}$/,
		'SE': /^SE\d{12}$/,
		'SI': /^SI\d{8}$/,
		'SK': /^SK\d{10}$/,
		'XI': /^XI[A-Z0-9]{5,12}$/
	};

	const cc = number.substring(0, 2);
	const num = number.substring(2);

	if (!(cc in map)) {
		return false;
	}

	if (number.search(map[cc]) === -1) {
		return false;
	}

	if (cc === 'PL') {
		return NIP.isValid(num);
	}

	return true;
}

module.exports = {
	normalize: normalize,
	isValid: isValid
};