multichain-address-validator/dist/esm/validators/bch_validator.js

Multichain address validator for Bitcoin and other blockchains.

import { NetworkType } from '../types.js';
import BTCValidator from './bitcoin_validator.js';
import { getAddress } from '../helpers.js';
const CHARSET = 'qpzry9x8gf2tvdw0s3jn54khce6mua7l';
const GENERATOR = [
    0x98f2bc8e61n, 0x79b76d99e2n, 0xf33e5fb3c4n, 0xae2eabe2a8n, 0x1e4f43e470n
];
function cashAddrPolymod(values) {
    let chk = 1n;
    for (let i = 0; i < values.length; i++) {
        const top = chk >> 35n;
        chk = ((chk & 0x07ffffffffn) << 5n) ^ BigInt(values[i]);
        for (let j = 0n; j < 5n; j++) {
            if ((top >> j) & 1n) {
                chk ^= GENERATOR[Number(j)];
            }
        }
    }
    return chk ^ 1n;
}
function prefixExpand(prefix) {
    const ret = [];
    for (let i = 0; i < prefix.length; i++) {
        ret.push(prefix.charCodeAt(i) & 31);
    }
    ret.push(0);
    return ret;
}
function verifyCashAddrChecksum(prefix, payload) {
    const expanded = prefixExpand(prefix).concat(payload);
    return cashAddrPolymod(expanded) === 0n;
}
function validateCashAddr(address, opts) {
    let raw_address;
    const prefix = opts.networkType === NetworkType.MainNet
        ? 'bitcoincash'
        : 'bchtest';
    const res = address.split(':');
    if (res.length === 1) {
        raw_address = address;
    }
    else {
        if (res[0] !== prefix) {
            return false;
        }
        raw_address = res[1];
    }
    const regexp = new RegExp(opts.regexp);
    if (!regexp.test(raw_address)) {
        return false;
    }
    if (raw_address.toLowerCase() !== raw_address && raw_address.toUpperCase() !== raw_address) {
        return false;
    }
    raw_address = raw_address.toLowerCase();
    // Decode characters using the bech32/CashAddr charset
    const data = [];
    for (const c of raw_address) {
        const d = CHARSET.indexOf(c);
        if (d === -1) {
            return false;
        }
        data.push(d);
    }
    try {
        if (!verifyCashAddrChecksum(prefix, data)) {
            return false;
        }
    }
    catch {
        return false;
    }
    return true;
}
const DefaultBCHValidatorOpts = {
    regexp: /^[qQpP][0-9a-zA-Z]{41}$/,
};
export default (opts) => ({
    isValidAddress: function (address) {
        const addr = getAddress(address);
        const _opts = { ...DefaultBCHValidatorOpts, ...opts };
        return validateCashAddr(addr, _opts) || BTCValidator(opts).isValidAddress(address);
    }
});