trezor-suite/packages/address-validator/src/nem_validator.js

const { addressType } = require('./crypto/utils');
var cryptoUtils = require('./crypto/utils');

/**
 * Check if an address is valid
 *
 * @param {string} _address - An address
 *
 * @return {boolean} - True if address is valid, false otherwise
 */
var isValidAddress = function (_address) {
    var address = _address.toString().toUpperCase().replace(/-/g, '');
    if (!address || address.length !== 40) {
        return false;
    }
    var decoded = cryptoUtils.toHex(cryptoUtils.base32.b32decode(address));
    var stepThreeChecksum = cryptoUtils.keccak256Checksum(Buffer.from(decoded.slice(0, 42), 'hex'));

    return stepThreeChecksum === decoded.slice(42);
};

module.exports = {
    isValidAddress: isValidAddress,

    getAddressType: function (address, currency, networkType) {
        if (this.isValidAddress(address, currency, networkType)) {
            return addressType.ADDRESS;
        }
        return undefined;
    },
};