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server.js
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server.js
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const express = require('express');
// const serveIndex = require('serve-index');
const ethers = require('ethers');
const Web3 = require('web3');
const path = require('path');
const config = require('./config.json');
const erc721 = require('./erc721.json');
// console.log(erc721);
// create express server
const app = express();
const port = config.port;
console.log('NFT list: ', JSON.stringify(config.contracts));
const web3 = new Web3(new Web3.providers.HttpProvider(config.infura));
// needed to work with post of JSON object
app.use(express.json());
// display static content list in public folder
app.use(express.static('nft-app'));
app.use('/public', express.static('public'));
// app.use('/public', serveIndex('public'));
// sample midware logs time for api calls
app.use('/api', (req, res, next) => {
console.log('Public content request time: ', Date.now());
next();
});
// API implementation
app.get('/api/contracts', (req, res) => {
res.json(config.contracts);
});
const promisify = (inner) =>
new Promise((resolve, reject) =>
inner((err, res) => {
if (err) {
reject(err);
} else {
resolve(res);
}
})
);
async function getOwner(contract, tokenId) {
const nftToken = new web3.eth.Contract(erc721, contract);
res = await promisify(cb => nftToken.methods.ownerOf(tokenId).call(cb));
console.log("token owner: ", res);
return res;
};
app.post('/api/verify', (req, res) => {
const msg = req.body;
console.log("verify message: ", msg);
try {
const message = msg.contract + "-" + msg.tokenId;
const signerAddr = ethers.utils.verifyMessage(message, msg.signature);
console.log("signer address: ", signerAddr);
getOwner(msg.contract, msg.tokenId).then( owner => {
res.json({ signer: msg.signer, verified: signerAddr, owner: owner });
}).catch(err => {
// console.log(err.message);
res.json({ error: err.message });
});
} catch (err) {
// console.log(err);
res.json({ error: err.message });
}
});
app.get('/', (req, res) => {
res.sendFile(path.join(__dirname, 'nft-app/index.html'));
});
// start server
app.listen(port, () => {
console.log(`Server listening on the port::${port}`);
});