@depay/verify-payment/dist/esm/index.js

A light JavaScript/TypeScript package to decode payment instructions for the DePay payment protocol.

const ARBITRUM_ADDRESS = '0x328FE8bbd30487BB7b5A8eEb909f892E9E229271';
const AVALANCHE_ADDRESS = '0x39E7C98BF4ac3E4C394dD600397f5f7Ee3779BE8';
const BASE_ADDRESS = '0x48825133EF08327535D0b24d73779E82BE6Ea4d9';
const BSC_ADDRESS = '0x5F565EDfB9C446976a9F9910631cfeDb6A87220c';
const ETHEREUM_ADDRESS = '0x365f7B56D2fB16C8Af89D7d33b420E4e013461e8';
const GNOSIS_ADDRESS = '0x328FE8bbd30487BB7b5A8eEb909f892E9E229271';
const OPTIMISM_ADDRESS = '0x558302715e3011Be6695605c11A65526D2ba2245';
const POLYGON_ADDRESS = '0xe04b08Dfc6CaA0F4Ec523a3Ae283Ece7efE00019';
const WORLDCHAIN_ADDRESS = '0x886eb82a7e5E7310F66A0E83748662A17E391eb0';
const SOLANA_ADDRESS = 'DePayR1gQfDmViCPKctnZXNtUgqRwnEqMax8LX9ho1Zg';
const PROTOCOL_ADDRESSES = {
    'arbitrum': ARBITRUM_ADDRESS,
    '42161': ARBITRUM_ADDRESS,
    '0xa4b1': ARBITRUM_ADDRESS,
    'avalanche': AVALANCHE_ADDRESS,
    '43114': AVALANCHE_ADDRESS,
    '0xa86a': AVALANCHE_ADDRESS,
    'base': BASE_ADDRESS,
    '8453': BASE_ADDRESS,
    '0x2105': BASE_ADDRESS,
    'bsc': BSC_ADDRESS,
    '56': BSC_ADDRESS,
    '0x38': BSC_ADDRESS,
    'ethereum': ETHEREUM_ADDRESS,
    '1': ETHEREUM_ADDRESS,
    '0x1': ETHEREUM_ADDRESS,
    'gnosis': GNOSIS_ADDRESS,
    '100': GNOSIS_ADDRESS,
    '0x64': GNOSIS_ADDRESS,
    'optimism': OPTIMISM_ADDRESS,
    '10': OPTIMISM_ADDRESS,
    '0xa': OPTIMISM_ADDRESS,
    'polygon': POLYGON_ADDRESS,
    '137': POLYGON_ADDRESS,
    '0x89': POLYGON_ADDRESS,
    'solana': SOLANA_ADDRESS,
    'worldchain': WORLDCHAIN_ADDRESS,
    '480': WORLDCHAIN_ADDRESS,
    '0x1e0': WORLDCHAIN_ADDRESS,
};

const verifyAddress = (blockchain, address) => {
    return PROTOCOL_ADDRESSES[blockchain] === address;
};
function splitHexData(data, start, length) {
    return data.substring(start, start + length);
}
function parseUint256(data) {
    return BigInt(`0x${data}`); // Prefix with '0x' to ensure it's treated as a hex value
}
function parseAddress(data) {
    return "0x" + data.substring(24);
}
function decodePayment({ blockchain, address, transaction }) {
    if (!verifyAddress(blockchain, address)) {
        return;
    }
    if (typeof transaction === 'string' && transaction.match('0x')) { // EVM
        const method = transaction.substring(2, 10);
        if (method === 'cac7130c') { // pay(tuple payment)
            return {
                amount: parseUint256(splitHexData(transaction, 74, 64)),
                token: parseAddress(splitHexData(transaction, 458, 64)),
                receiver: parseAddress(splitHexData(transaction, 650, 64)),
            };
        }
        else if (method === '64f0acc4') { // pay(tuple payment,tuple permitTransferFromAndSignature)
            return {
                amount: parseUint256(splitHexData(transaction, 138, 64)),
                token: parseAddress(splitHexData(transaction, 522, 64)),
                receiver: parseAddress(splitHexData(transaction, 714, 64)),
            };
        }
    }
    return;
}

export { PROTOCOL_ADDRESSES, decodePayment };