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@geggleto
Created September 22, 2018 05:29
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Express Service to verify Metamask Message and recover Ethereum Account used to sign
/**
Locally / Non-SSL: node verify-address.js local
**/
const LOCAL = (process.argv[2] === "local");
const fs = require('fs');
const express = require('express');
const app = express();
const bodyParser = require('body-parser');
const http = require('http');
const https = require('https');
const Web3 = require('Web3');
let httpServer;
let web3 = new Web3(new Web3.providers.HttpProvider('https://****/'));
app.use(bodyParser.json());
app.get('/', function (req, res) {
res.send('hello');
});
/**
Method
web3.personal.sign(message, signer, (err, signature) => {
axios.post('https://.../auth', {
address: signer,
signature : signature,
message : message,
original_message : original_message
}).then(response => {
**/
app.all('/verify', function (req, res) {
let signatureHex = req.body.signature;
let address = req.body.address;
let original_message = req.body.original_message;
let recoveredAddress = web3.eth.accounts.recover(original_message, signatureHex);
if (recoveredAddress.toUpperCase() === address.toUpperCase()) { //verified
res.send(JSON.stringify({
verified: true
}));
} else { //failed
res.send(JSON.stringify({
verified: false
}));
}
});
if (LOCAL === false) {
const credentials = {
key: fs.readFileSync('/etc/letsencrypt/live/***/privkey.pem'),
cert: fs.readFileSync('/etc/letsencrypt/live/***/fullchain.pem')
};
httpServer = https.createServer(credentials, app);
} else {
httpServer = http.createServer(app);
}
console.log("Listening on port 3100");
httpServer.listen(3100);
@umeraqeel786
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Use this
const Web3 = require('web3');
instead of
const Web3 = require('Web3');

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