cereallarceny · May 2, 2023 06:41 · bhavanimandapati · Apr 1, 2019 · nikitaeverywhere · Nov 6, 2019
diff --git a/index.js b/index.js
 const md5File = require('md5-file');
 const path = require('path');

 // CSS styles will be imported on load and that complicates matters... ignore those bad boys!
 const ignoreStyles = require('ignore-styles');
 const register = ignoreStyles.default;

 // We also want to ignore all image requests
 // When running locally these will load from a standard import
 // When running on the server, we want to load via their hashed version in the build folder
 const extensions = ['.gif', '.jpeg', '.jpg', '.png', '.svg'];

 // Override the default style ignorer, also modifying all image requests
 register(ignoreStyles.DEFAULT_EXTENSIONS, (mod, filename) => {
  if (!extensions.find(f => filename.endsWith(f))) {
    // If we find a style
    return ignoreStyles.noOp();
  } else {
    // If we find an image
    const hash = md5File.sync(filename).slice(0, 8);
    const bn = path.basename(filename).replace(/(\.\w{3})$/, `.${hash}$1`);

    mod.exports = `/static/media/${bn}`;
  }
 });

 // Set up babel to do its thing... env for the latest toys, react-app for CRA
 // Notice three plugins: the first two allow us to use import rather than require, the third is for code splitting
 // Polyfill is required for Babel 7, polyfill includes a custom regenerator runtime and core-js
 require('@babel/polyfill');
 require('@babel/register')({
  ignore: [/\/(build|node_modules)\//],
  presets: ['@babel/preset-env', '@babel/preset-react'],
  plugins: [
    '@babel/plugin-syntax-dynamic-import',
    'dynamic-import-node',
    'react-loadable/babel'
  ]
 });

 // Now that the nonsense is over... load up the server entry point
 require('./server');
diff --git a/loader.js b/loader.js
 // Express requirements
 import path from 'path';
 import fs from 'fs';

 // React requirements
 import React from 'react';
 import { renderToString } from 'react-dom/server';
 import Helmet from 'react-helmet';
 import { Provider } from 'react-redux';
 import { StaticRouter } from 'react-router';
 import { Frontload, frontloadServerRender } from 'react-frontload';
 import Loadable from 'react-loadable';

 // Our store, entrypoint, and manifest
 import createStore from '../src/store';
 import App from '../src/app/app';
 import manifest from '../build/asset-manifest.json';

 // Some optional Redux functions related to user authentication
 import { setCurrentUser, logoutUser } from '../src/modules/auth';

 // LOADER
 export default (req, res) => {
  /*
    A simple helper function to prepare the HTML markup. This loads:
      - Page title
      - SEO meta tags
      - Preloaded state (for Redux) depending on the current route
      - Code-split script tags depending on the current route
  */
  const injectHTML = (data, { html, title, meta, body, scripts, state }) => {
    data = data.replace('<html>', `<html ${html}>`);
    data = data.replace(/<title>.*?<\/title>/g, title);
    data = data.replace('</head>', `${meta}</head>`);
    data = data.replace(
      '<div id="root"></div>',
      `<div id="root">${body}</div><script>window.__PRELOADED_STATE__ = ${state}</script>`
    );
    data = data.replace('</body>', scripts.join('') + '</body>');

    return data;
  };

  // Load in our HTML file from our build
  fs.readFile(
    path.resolve(__dirname, '../build/index.html'),
    'utf8',
    (err, htmlData) => {
      // If there's an error... serve up something nasty
      if (err) {
        console.error('Read error', err);

        return res.status(404).end();
      }

      // Create a store (with a memory history) from our current url
      const { store } = createStore(req.url);

      // If the user has a cookie (i.e. they're signed in) - set them as the current user
      // Otherwise, we want to set the current state to be logged out, just in case this isn't the default
      if ('mywebsite' in req.cookies) {
        store.dispatch(setCurrentUser(req.cookies.mywebsite));
      } else {
        store.dispatch(logoutUser());
      }

      const context = {};
      const modules = [];

      /*
        Here's the core funtionality of this file. We do the following in specific order (inside-out):
          1. Load the <App /> component
          2. Inside of the Frontload HOC
          3. Inside of a Redux <StaticRouter /> (since we're on the server), given a location and context to write to
          4. Inside of the store provider
          5. Inside of the React Loadable HOC to make sure we have the right scripts depending on page
          6. Render all of this sexiness
          7. Make sure that when rendering Frontload knows to get all the appropriate preloaded requests

        In English, we basically need to know what page we're dealing with, and then load all the appropriate scripts and
        data for that page. We take all that information and compute the appropriate state to send to the user. This is
        then loaded into the correct components and sent as a Promise to be handled below.
      */
      frontloadServerRender(() =>
        renderToString(
          <Loadable.Capture report={m => modules.push(m)}>
            <Provider store={store}>
              <StaticRouter location={req.url} context={context}>
                <Frontload isServer={true}>
                  <App />
                </Frontload>
              </StaticRouter>
            </Provider>
          </Loadable.Capture>
        )
      ).then(routeMarkup => {
        if (context.url) {
          // If context has a url property, then we need to handle a redirection in Redux Router
          res.writeHead(302, {
            Location: context.url
          });

          res.end();
        } else {
          // Otherwise, we carry on...

          // Let's give ourself a function to load all our page-specific JS assets for code splitting
          const extractAssets = (assets, chunks) =>
            Object.keys(assets)
              .filter(asset => chunks.indexOf(asset.replace('.js', '')) > -1)
              .map(k => assets[k]);

          // Let's format those assets into pretty <script> tags
          const extraChunks = extractAssets(manifest, modules).map(
            c => `<script type="text/javascript" src="/${c.replace(/^\//, '')}"></script>`
          );

          // We need to tell Helmet to compute the right meta tags, title, and such
          const helmet = Helmet.renderStatic();

          // NOTE: Disable if you desire
          // Let's output the title, just to see SSR is working as intended
          console.log('THE TITLE', helmet.title.toString());

          // Pass all this nonsense into our HTML formatting function above
          const html = injectHTML(htmlData, {
            html: helmet.htmlAttributes.toString(),
            title: helmet.title.toString(),
            meta: helmet.meta.toString(),
            body: routeMarkup,
            scripts: extraChunks,
            state: JSON.stringify(store.getState()).replace(/</g, '\\u003c')
          });

          // We have all the final HTML, let's send it to the user already!
          res.send(html);
        }
      });
    }
  );
 };
diff --git a/server.js b/server.js
 // Express requirements
 import bodyParser from 'body-parser';
 import compression from 'compression';
 import express from 'express';
 import morgan from 'morgan';
 import path from 'path';
 import forceDomain from 'forcedomain';
 import Loadable from 'react-loadable';
 import cookieParser from 'cookie-parser';

 // Our loader - this basically acts as the entry point for each page load
 import loader from './loader';

 // Create our express app using the port optionally specified
 const app = express();
 const PORT = process.env.PORT || 3000;

 // NOTE: UNCOMMENT THIS IF YOU WANT THIS FUNCTIONALITY
 /*
  Forcing www and https redirects in production, totally optional.

  http://mydomain.com
  http://www.mydomain.com
  https://mydomain.com

  Resolve to: https://www.mydomain.com
 */
 // if (process.env.NODE_ENV === 'production') {
 //   app.use(
 //     forceDomain({
 //       hostname: 'www.mydomain.com',
 //       protocol: 'https'
 //     })
 //   );
 // }

 // Compress, parse, log, and raid the cookie jar
 app.use(compression());
 app.use(bodyParser.json());
 app.use(bodyParser.urlencoded({ extended: false }));
 app.use(morgan('dev'));
 app.use(cookieParser());

 // Set up homepage, static assets, and capture everything else
 app.use(express.Router().get('/', loader));
 app.use(express.static(path.resolve(__dirname, '../build')));
 app.use(loader);

 // We tell React Loadable to load all required assets and start listening - ROCK AND ROLL!
 Loadable.preloadAll().then(() => {
  app.listen(PORT, console.log(`App listening on port ${PORT}!`));
 });

 // Handle the bugs somehow
 app.on('error', error => {
  if (error.syscall !== 'listen') {
    throw error;
  }

  const bind = typeof PORT === 'string' ? 'Pipe ' + PORT : 'Port ' + PORT;

  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      console.error(bind + ' is already in use');
      process.exit(1);
      break;
    default:
      throw error;
  }
 });
	const md5File = require('md5-file');
	const path = require('path');

	// CSS styles will be imported on load and that complicates matters... ignore those bad boys!
	const ignoreStyles = require('ignore-styles');
	const register = ignoreStyles.default;

	// We also want to ignore all image requests
	// When running locally these will load from a standard import
	// When running on the server, we want to load via their hashed version in the build folder
	const extensions = ['.gif', '.jpeg', '.jpg', '.png', '.svg'];

	// Override the default style ignorer, also modifying all image requests
	register(ignoreStyles.DEFAULT_EXTENSIONS, (mod, filename) => {
	if (!extensions.find(f => filename.endsWith(f))) {
	// If we find a style
	return ignoreStyles.noOp();
	} else {
	// If we find an image
	const hash = md5File.sync(filename).slice(0, 8);
	const bn = path.basename(filename).replace(/(\.\w{3})$/, `.${hash}$1`);

	mod.exports = `/static/media/${bn}`;
	}
	});

	// Set up babel to do its thing... env for the latest toys, react-app for CRA
	// Notice three plugins: the first two allow us to use import rather than require, the third is for code splitting
	// Polyfill is required for Babel 7, polyfill includes a custom regenerator runtime and core-js
	require('@babel/polyfill');
	require('@babel/register')({
	ignore: [/\/(build\|node_modules)\//],
	presets: ['@babel/preset-env', '@babel/preset-react'],
	plugins: [
	'@babel/plugin-syntax-dynamic-import',
	'dynamic-import-node',
	'react-loadable/babel'
	]
	});

	// Now that the nonsense is over... load up the server entry point
	require('./server');
	// Express requirements
	import path from 'path';
	import fs from 'fs';

	// React requirements
	import React from 'react';
	import { renderToString } from 'react-dom/server';
	import Helmet from 'react-helmet';
	import { Provider } from 'react-redux';
	import { StaticRouter } from 'react-router';
	import { Frontload, frontloadServerRender } from 'react-frontload';
	import Loadable from 'react-loadable';

	// Our store, entrypoint, and manifest
	import createStore from '../src/store';
	import App from '../src/app/app';
	import manifest from '../build/asset-manifest.json';

	// Some optional Redux functions related to user authentication
	import { setCurrentUser, logoutUser } from '../src/modules/auth';

	// LOADER
	export default (req, res) => {
	/*
	A simple helper function to prepare the HTML markup. This loads:
	- Page title
	- SEO meta tags
	- Preloaded state (for Redux) depending on the current route
	- Code-split script tags depending on the current route
	*/
	const injectHTML = (data, { html, title, meta, body, scripts, state }) => {
	data = data.replace('<html>', `<html ${html}>`);
	data = data.replace(/<title>.*?<\/title>/g, title);
	data = data.replace('</head>', `${meta}</head>`);
	data = data.replace(
	'<div id="root"></div>',
	`<div id="root">${body}</div><script>window.__PRELOADED_STATE__ = ${state}</script>`
	);
	data = data.replace('</body>', scripts.join('') + '</body>');

	return data;
	};

	// Load in our HTML file from our build
	fs.readFile(
	path.resolve(__dirname, '../build/index.html'),
	'utf8',
	(err, htmlData) => {
	// If there's an error... serve up something nasty
	if (err) {
	console.error('Read error', err);

	return res.status(404).end();
	}

	// Create a store (with a memory history) from our current url
	const { store } = createStore(req.url);

	// If the user has a cookie (i.e. they're signed in) - set them as the current user
	// Otherwise, we want to set the current state to be logged out, just in case this isn't the default
	if ('mywebsite' in req.cookies) {
	store.dispatch(setCurrentUser(req.cookies.mywebsite));
	} else {
	store.dispatch(logoutUser());
	}

	const context = {};
	const modules = [];

	/*
	Here's the core funtionality of this file. We do the following in specific order (inside-out):
	1. Load the <App /> component
	2. Inside of the Frontload HOC
	3. Inside of a Redux <StaticRouter /> (since we're on the server), given a location and context to write to
	4. Inside of the store provider
	5. Inside of the React Loadable HOC to make sure we have the right scripts depending on page
	6. Render all of this sexiness
	7. Make sure that when rendering Frontload knows to get all the appropriate preloaded requests

	In English, we basically need to know what page we're dealing with, and then load all the appropriate scripts and
	data for that page. We take all that information and compute the appropriate state to send to the user. This is
	then loaded into the correct components and sent as a Promise to be handled below.
	*/
	frontloadServerRender(() =>
	renderToString(
	<Loadable.Capture report={m => modules.push(m)}>
	<Provider store={store}>
	<StaticRouter location={req.url} context={context}>
	<Frontload isServer={true}>
	<App />
	</Frontload>
	</StaticRouter>
	</Provider>
	</Loadable.Capture>
	)
	).then(routeMarkup => {
	if (context.url) {
	// If context has a url property, then we need to handle a redirection in Redux Router
	res.writeHead(302, {
	Location: context.url
	});

	res.end();
	} else {
	// Otherwise, we carry on...

	// Let's give ourself a function to load all our page-specific JS assets for code splitting
	const extractAssets = (assets, chunks) =>
	Object.keys(assets)
	.filter(asset => chunks.indexOf(asset.replace('.js', '')) > -1)
	.map(k => assets[k]);

	// Let's format those assets into pretty <script> tags
	const extraChunks = extractAssets(manifest, modules).map(
	c => `<script type="text/javascript" src="/${c.replace(/^\//, '')}"></script>`
	);

	// We need to tell Helmet to compute the right meta tags, title, and such
	const helmet = Helmet.renderStatic();

	// NOTE: Disable if you desire
	// Let's output the title, just to see SSR is working as intended
	console.log('THE TITLE', helmet.title.toString());

	// Pass all this nonsense into our HTML formatting function above
	const html = injectHTML(htmlData, {
	html: helmet.htmlAttributes.toString(),
	title: helmet.title.toString(),
	meta: helmet.meta.toString(),
	body: routeMarkup,
	scripts: extraChunks,
	state: JSON.stringify(store.getState()).replace(/</g, '\\u003c')
	});

	// We have all the final HTML, let's send it to the user already!
	res.send(html);
	}
	});
	}
	);
	};
	// Express requirements
	import bodyParser from 'body-parser';
	import compression from 'compression';
	import express from 'express';
	import morgan from 'morgan';
	import path from 'path';
	import forceDomain from 'forcedomain';
	import Loadable from 'react-loadable';
	import cookieParser from 'cookie-parser';

	// Our loader - this basically acts as the entry point for each page load
	import loader from './loader';

	// Create our express app using the port optionally specified
	const app = express();
	const PORT = process.env.PORT \|\| 3000;

	// NOTE: UNCOMMENT THIS IF YOU WANT THIS FUNCTIONALITY
	/*
	Forcing www and https redirects in production, totally optional.

	http://mydomain.com
	http://www.mydomain.com
	https://mydomain.com

	Resolve to: https://www.mydomain.com
	*/
	// if (process.env.NODE_ENV === 'production') {
	// app.use(
	// forceDomain({
	// hostname: 'www.mydomain.com',
	// protocol: 'https'
	// })
	// );
	// }

	// Compress, parse, log, and raid the cookie jar
	app.use(compression());
	app.use(bodyParser.json());
	app.use(bodyParser.urlencoded({ extended: false }));
	app.use(morgan('dev'));
	app.use(cookieParser());

	// Set up homepage, static assets, and capture everything else
	app.use(express.Router().get('/', loader));
	app.use(express.static(path.resolve(__dirname, '../build')));
	app.use(loader);

	// We tell React Loadable to load all required assets and start listening - ROCK AND ROLL!
	Loadable.preloadAll().then(() => {
	app.listen(PORT, console.log(`App listening on port ${PORT}!`));
	});

	// Handle the bugs somehow
	app.on('error', error => {
	if (error.syscall !== 'listen') {
	throw error;
	}

	const bind = typeof PORT === 'string' ? 'Pipe ' + PORT : 'Port ' + PORT;

	switch (error.code) {
	case 'EACCES':
	console.error(bind + ' requires elevated privileges');
	process.exit(1);
	break;
	case 'EADDRINUSE':
	console.error(bind + ' is already in use');
	process.exit(1);
	break;
	default:
	throw error;
	}
	});