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June 1, 2019 18:56
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| const express = require('express'); | |
| const app = express(); | |
| const puppeteer = require('puppeteer'); | |
| const ua = require("useragent"); | |
| function isBot(userAgent) { | |
| const agent = ua.is(userAgent); | |
| return !agent.webkit && !agent.opera && !agent.ie && | |
| !agent.chrome && !agent.safari && !agent.mobile_safari && | |
| !agent.firefox && !agent.mozilla && !agent.android; | |
| } | |
| const react_build_dir = "../build/"; // this variable refers to directory where our client-side React is built | |
| app.use(react_build_dir); // this is to allow browser download the static files of the React app (CSS, JS, images). | |
| const port = 3000; | |
| app.get('*', async (req, res) => { | |
| if (!isBot(req.headers['user-agent'])) { | |
| res.sendFile(react_build_dir + '/index.html'); // this is a human, send the HTML right away | |
| } else { | |
| try { | |
| const browser = await puppeteer.launch({headless: true}); | |
| const page = await browser.newPage(); | |
| // we need to override the headless Chrome user agent since its default one is still considered as "bot" | |
| await page.setUserAgent('Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36'); | |
| const local_url = 'http://localhost:' + port + req.originalUrl; | |
| await page.goto(local_url, { | |
| waitUntil: "networkidle0", | |
| }); | |
| const html = await page.evaluate(() => { | |
| return document.documentElement.innerHTML; | |
| }); | |
| res.send(html); | |
| } catch(e) { | |
| console.log(e); | |
| res.send("ERROR"); | |
| } | |
| } | |
| }); | |
| app.listen(port, () => { | |
| console.log(`Web server is running at port ${port}`); | |
| }); |
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