Ethereum: Sign Transactions Offline in NodeJS | 用NodeJS对以太坊交易离线签名

sign-offline.js

#!/usr/bin/env node
'use strict';

// ethereum: generate signed transactions
// source: https://gist.github.com/neuhaus/7387edf411513a9f11f1242dcec8d62e

const fs        = require('fs');
const rls       = require('readline-sync');
const Accounts  = require('web3-eth-accounts');
const web3utils = require('web3-utils');
const accounts  = new Accounts();

async function main() {
        if (process.argv.length < 6) {
                console.log("Usage:\n" +
                        "  sign-offline.js <filename> <recipient> <amount> <nonce> <gasprice>\n" +
            "  ~ filename:  keystore file of your account\n" +
            "  ~ amount:    ether(s) you intend to send (*NOT* in wei)\n" +
            "  ~ recipient: address prefixed with '0x'\n" +
            "  ~ nonce:     web3.eth.getTransactionCount(from_address) is suggested\n" +
            "  ~ gasprice:  in Gwei, ethstats.net is recommended for reference\n"
            );
                process.exit(1);
        }

        let filename  = process.argv[2];
        let recipient = process.argv[3];
        let amount    = web3utils.toWei(process.argv[4], "ether");
        let nonce     = process.argv[5];
        let gasprice  = web3utils.toWei(process.argv[6], "gwei");

        console.log("File %s\nTo %s\nAmount %f wei\nNonce %d\nPrice %f Gwei\n",
                filename, recipient, amount, nonce, gasprice);

    let keystore = JSON.parse(fs.readFileSync(filename));

        if (!("crypto" in keystore)) {
                // MEW creates capitalized "crypto" property
                // web3 expects it in lowercase
                keystore.crypto = keystore.Crypto;
                delete keystore.Crypto;
        }

        let password  = rls.question('keystore Password? ', { hideEchoBack: true });
        let myaccount = accounts.decrypt(keystore, password);

        let data      = await accounts.signTransaction({
                to: recipient,
                value: amount,
                gas: 21000,
                gasPrice: gasprice,
                nonce: nonce,
                chainId: 1 // mainNet
        }, myaccount.privateKey);

        console.log("signed raw transaction: ", data.rawTransaction);
}

main();

Nice!