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index.js
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index.js
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const https = require('https');
const express = require('express');
const rateLimit = require('express-rate-limit');
const cors = require('cors');
const path = require('path');
const fs = require('fs');
const Keyv = require('keyv');
const moment = require('moment');
const sqlLock = require('sql-lock');
const getTweet = require('./utils/getTweet');
const getTwitterFollowersId = require('./utils/getTwitterFollowersId');
const isAddress = require('./utils/address');
const sendNetworkToken = require('./utils/sendNetworkToken');
require('dotenv').config();
const main = async () => {
const keyv = new Keyv(process.env.database_uri);
await sqlLock.initialize(process.env.database_uri, { locking_ttl: 30000 });
const { user_rate_limit, rate_limit_duration } = process.env;
const ethAddressRegex = /0x[a-fA-F0-9]{40}/;
const mentionRegex = /(?<!^)@parastateio/;
// Web page rate limit
const web_page_limiter = rateLimit({
windowMs: ((parseInt(rate_limit_duration) * 60) * 1000),
max: parseInt(user_rate_limit),
message: '<!DOCTYPE html><html><head><meta charset="utf-8"><link rel="shortcut icon" href="favicon.ico"><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><meta name="theme-color" content="#000000"><title>Home | Rate Limit Exceeded</title><link rel="stylesheet" href="style.css"></head><body><div id="root"><div class="View WelcomeView"><h1 class="Banner">Rate Limit Exceeded</h1><br /><div class="Message center"><div class="Title"><h3>Sorry!</h3></div></div><div class="center"><img src="rate_limit.png"></img></div><div class="Message center"><p>Rate limit exceeded, Please try again later.</p></div></div></div></body></html>',
});
// API rate limit
const api_limiter = rateLimit({
windowMs: ((parseInt(rate_limit_duration) * 60) * 1000),
max: parseInt(user_rate_limit),
message: 'Rate limit exceeded',
});
const app = express();
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');
app.use(express.static(path.join(__dirname, '/public/')));
app.use(cors());
// Rate limiting for simple spamming of page reloads
app.use('/faucet/', web_page_limiter);
// Rate limiting for repeated API calls
app.use('/api/', api_limiter);
app.get('/', (req, res) => {
const direct = `Click to visit <a href="https://${process.env.server_name}:${process.env.server_port}/faucet" target="_blank"> :8001/faucet </a>`;
res.send(direct);
});
app.get('/faucet', (req, res) => {
res.render('index', {
title: 'Home',
erc20_address: process.env.erc20_address,
blockchain_name: process.env.blockchain_name,
erc20_token_amount_in_wei: process.env.erc20_token_amount_in_wei,
rate_limit_duration: process.env.rate_limit_duration,
twitter_handle: process.env.twitter_handle,
user_rate_limit: process.env.user_rate_limit,
});
});
app.post('/api/twitter/:tweet_id', async (req, res) => {
const { tweet_id } = req.params;
if (tweet_id.match(/incorrect/g)) {
console.log('tweet id is broken');
const toastObjectFail = {
avatar: 'toast-avatar.jpg',
text: 'Invalid Tweet URL, click here for more information!',
duration: 15000,
destination: 'https://help.twitter.com/en/using-twitter/tweet-and-moment-url',
newWindow: true,
close: true,
gravity: 'top', // `top` or `bottom`
position: 'right', // `left`, `center` or `right`
backgroundColor: 'linear-gradient(to right, #330066, #9900CC)',
stopOnFocus: false, // Prevents dismissing of toast on hover
onClick() {}, // Callback after click
};
return res.send(toastObjectFail);
}
const result = await getTweet(tweet_id);
if (JSON.stringify(result).toLowerCase().includes('error')) {
console.log('tweet id is broken');
const toastObjectFail = {
avatar: 'toast-avatar.jpg',
text: 'Invalid Tweet URL, click here for more information!',
duration: 15000,
destination: 'https://help.twitter.com/en/using-twitter/tweet-and-moment-url',
newWindow: true,
close: true,
gravity: 'top', // `top` or `bottom`
position: 'right', // `left`, `center` or `right`
backgroundColor: 'linear-gradient(to right, #330066, #9900CC)',
stopOnFocus: false, // Prevents dismissing of toast on hover
onClick() {}, // Callback after click
};
return res.send(toastObjectFail);
}
console.log(`Full result: ${JSON.stringify(result)}`);
const ethAddress = ethAddressRegex.exec(result.full_text);
if (ethAddress === null) {
const toastObjectFail = {
avatar: 'toast-avatar.jpg',
text: 'The recipient address in the Tweet is not valid',
duration: 15000,
close: true,
gravity: 'top', // `top` or `bottom`
position: 'right', // `left`, `center` or `right`
backgroundColor: 'linear-gradient(to right, #FF0000, #800000)',
stopOnFocus: false, // Prevents dismissing of toast on hover
onClick() {}, // Callback after click
};
return res.send(toastObjectFail);
}
if (!isAddress(ethAddress[0])) {
const toastObjectFail = {
avatar: 'toast-avatar.jpg',
text: 'The recipient address in the Tweet is not valid',
duration: 15000,
close: true,
gravity: 'top', // `top` or `bottom`
position: 'right', // `left`, `center` or `right`
backgroundColor: 'linear-gradient(to right, #FF0000, #800000)',
stopOnFocus: false, // Prevents dismissing of toast on hover
onClick() {}, // Callback after click
};
return res.send(toastObjectFail);
}
if (mentionRegex.exec(result.full_text) === null) {
const toastObjectFail = {
avatar: 'toast-avatar.jpg',
text: `You must mention ${process.env.twitter_handle} somewhere in your tweet (except at the start)`,
duration: 15000,
close: true,
gravity: 'top', // `top` or `bottom`
position: 'right', // `left`, `center` or `right`
backgroundColor: 'linear-gradient(to right, #FF0000, #800000)',
stopOnFocus: false, // Prevents dismissing of toast on hover
onClick() {}, // Callback after click
};
return res.send(toastObjectFail);
}
if ((await keyv.get(`twitter-faucet-lasttx-${result.user.id}`)) === moment().format('YYYY-MM')) {
const toastObjectFail = {
avatar: 'toast-avatar.jpg',
text: 'Rate limit! You already received State tokens for this month',
duration: 15000,
close: true,
gravity: 'top', // `top` or `bottom`
position: 'right', // `left`, `center` or `right`
backgroundColor: 'linear-gradient(to right, #FF0000, #800000)',
stopOnFocus: false, // Prevents dismissing of toast on hover
onClick() {}, // Callback after click
};
return res.send(toastObjectFail);
}
if ((await keyv.get(`ethaddress-faucet-lasttx-${ethAddress[0]}`)) === moment().format('YYYY-MM')) {
const toastObjectFail = {
avatar: 'toast-avatar.jpg',
text: `Sorry! the address of ${ethAddress[0]} has already been funded for this month.`,
duration: 15000,
close: true,
gravity: 'top', // `top` or `bottom`
position: 'right', // `left`, `center` or `right`
backgroundColor: 'linear-gradient(to right, #FF0000, #800000)',
stopOnFocus: false, // Prevents dismissing of toast on hover
onClick() {}, // Callback after click
};
return res.send(toastObjectFail);
}
const followerIds = await getTwitterFollowersId();
if (!followerIds.includes(result.user.id.toString())) {
const toastObjectFail = {
avatar: 'toast-avatar.jpg',
text: `Click here and follow ${process.env.twitter_handle} first to receive tokens. NB. If you just followed, it may take 2 minutes to work.`,
duration: 15000,
close: true,
gravity: 'top', // `top` or `bottom`
position: 'right', // `left`, `center` or `right`
backgroundColor: 'linear-gradient(to right, #FF0000, #800000)',
stopOnFocus: false, // Prevents dismissing of toast on hover
onClick() {}, // Callback after click
};
return res.send(toastObjectFail);
}
const receipt = await sendNetworkToken(ethAddress[0]);
if (receipt.status === 'success') {
await keyv.set(`twitter-faucet-lasttx-${result.user.id}`, moment().format('YYYY-MM'));
const lockReleaser = await sqlLock.getLock(ethAddress[0], 3000);
await keyv.set(`ethaddress-faucet-lasttx-${ethAddress[0]}`, moment().format('YYYY-MM'));
lockReleaser();
const toastObjectSuccess = {
avatar: 'toast-avatar.jpg',
text: 'State token sent, please check your account!',
duration: 15000,
close: true,
gravity: 'top', // `top` or `bottom`
position: 'right', // `left`, `center` or `right`
backgroundColor: 'linear-gradient(to right, #008000, #3CBC3C)',
stopOnFocus: false, // Prevents dismissing of toast on hover
onClick() {}, // Callback after click
};
return res.send(toastObjectSuccess);
}
});
/**
* Server Activation
*/
if (process.env.https === 'yes') {
const ca = fs.readFileSync(`/etc/letsencrypt/live/${process.env.server_name}/fullchain.pem`, 'utf8');
const certificate = fs.readFileSync(`/etc/letsencrypt/live/${process.env.server_name}/cert.pem`, 'utf8');
const privateKey = fs.readFileSync(`/etc/letsencrypt/live/${process.env.server_name}/privkey.pem`, 'utf8');
const credentials = {
key: privateKey,
cert: certificate,
ca,
};
https.createServer(credentials, app).listen(process.env.server_port, process.env.host, () => {
console.log('Welcome to faucet; using https');
console.log(`Host:${process.env.host}\nPort: ${server_port}`);
});
} else if (process.env.https === 'no') {
app.listen(process.env.server_port, '0.0.0.0', () => {
console.log(`Listening to requests on http://localhost:${process.env.server_port}`);
});
} else {
console.log('ERROR: Please set the https setting in the .env config file');
}
};
main().catch((error) => {
console.log(error);
});