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‎Lesson03/exercise_002/package.json‎

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"version": "1.0.0",
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"description": "Second exercise for lesson 3",
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"main": "index.js",
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"scripts": {
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"test": "echo \"Error: no test specified\" && exit 1"
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},
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"repository": {
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"type": "git",
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"url": "git+https://github.com/TrainingByPackt/Professional-JavaScript.git",

‎Lesson03/exercise_003/index.js‎

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const fs = require('fs');
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const http = require('http');
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const mime = require('mime');
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const path = require('path');
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const url = require('url');
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function walkDirectory(dirPath, callback) {
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const dirents = fs.readdirSync(dirPath, { withFileTypes: true });
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dirents.forEach(dirent => {
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if (dirent.isDirectory()) {
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walkDirectory(path.join(dirPath, dirent.name), callback);
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} else {
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callback(path.join(dirPath, dirent.name));
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}
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});
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}
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const rootDirectory = path.resolve(process.argv[2] || './');
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const files = new Set();
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walkDirectory(rootDirectory, (file) => {
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file = file.substr(rootDirectory.length);
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files.add(file);
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});
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console.log(`Found ${files.size} in '${rootDirectory}'...`);
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const server = http.createServer();
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server.on('request', (request, response) => {
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const requestUrl = url.parse(request.url);
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const requestedPath = requestUrl.pathname;
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if (!files.has(requestedPath)) {
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console.log('404 %s', requestUrl.href);
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response.writeHead(404);
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response.end();
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return;
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}
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const contentType = mime.getType(path.extname(requestedPath));
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console.log('200 %s', requestUrl.href);
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response.writeHead(200, { 'Content-type': contentType });
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fs.createReadStream(path.join(rootDirectory, requestedPath))
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.pipe(response);
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});
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const port = 3000;
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console.log('Starting server on port %d.', port);
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console.log('Go to: http://localhost:%d', port);
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server.listen(port);

‎Lesson03/exercise_003/package-lock.json‎

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‎Lesson03/exercise_003/package.json‎

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{
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"name": "exercise_003",
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"version": "1.0.0",
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"description": "Static HTTP server.",
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"main": "index.js",
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"repository": {
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"type": "git",
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"url": "git+https://github.com/TrainingByPackt/Professional-JavaScript.git",
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"directory": "Lesson03/exercise_003"
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},
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"author": "",
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"license": "MIT",
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"dependencies": {
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"mime": "^2.4.4"
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}
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}

‎Lesson03/exercise_004/html/index.html‎

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<html>
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<head>
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<link rel="stylesheet" type="text/css" href="css/semantic.min.css" />
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<link rel="stylesheet" type="text/css" href="css/store.css" />
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</head>
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<body>
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<section>
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<h1 class="title">Welcome to Fresh Products Store!</h1>
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<div class="ui items">
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{{#products}}
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<div class="item">
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<div class="image"><img src="{{image}}" /></div>
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<div class="content">
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<a class="header">{{name}}</a>
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<div class="meta">
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<span>{{currency price}} / {{unit}}</span>
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</div>
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<div class="description">{{description}}</div>
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<div class="extra">
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{{#tags}}
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<div class="ui label teal">{{this}}</div>
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{{/tags}}
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</div>
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</div>
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</div>
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{{/products}}
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</div>
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</section>
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</body>
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</html>

‎Lesson03/exercise_004/index.js‎

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const fs = require('fs');
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const handlebars = require('handlebars');
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const http = require('http');
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const mime = require('mime');
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const path = require('path');
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const url = require('url');
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const staticDir = path.resolve(`${__dirname}/static`);
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console.log(`Static resources from ${staticDir}`);
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const data = fs.readFileSync('products.json');
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const products = JSON.parse(data.toString());
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console.log(`Loaded ${products.length} products...`);
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handlebars.registerHelper('currency', (number) => `$${number.toFixed(2)}`);
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const htmlString = fs.readFileSync('html/index.html').toString();
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const template = handlebars.compile(htmlString);
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function handleProductsPage(requestUrl, response) {
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response.writeHead(200);
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response.write(template({ products: products }));
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response.end();
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}
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function handleStaticFile(pathname, response) {
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// For security reasons, only serve files from static directory
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const fullPath = path.join(staticDir, pathname);
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// Check if file exists and is readable
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fs.access(fullPath, fs.constants.R_OK, (error) => {
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if (error) {
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console.error(`File is not readable: ${fullPath}`, error);
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response.writeHead(404);
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response.end();
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return;
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}
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const contentType = mime.getType(path.extname(fullPath));
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response.writeHead(200, { 'Content-type': contentType });
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fs.createReadStream(fullPath)
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.pipe(response);
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});
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}
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function handleRequest(request, response) {
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const requestUrl = url.parse(request.url);
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const pathname = requestUrl.pathname;
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if (pathname == '/' || pathname == '/index.html') {
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handleProductsPage(requestUrl, response);
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return;
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}
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handleStaticFile(pathname, response);
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}
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function initializeServer() {
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const server = http.createServer();
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server.on('request', handleRequest);
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const port = 3000;
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console.log('Go to: http://localhost:%d', port);
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server.listen(port);
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}
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initializeServer();

‎Lesson03/exercise_004/package-lock.json‎

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Some generated files are not rendered by default. Learn more about customizing how changed files appear on GitHub.

‎Lesson03/exercise_004/package.json‎

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{
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"name": "exercise_004",
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"version": "1.0.0",
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"description": "Exercise that demonstrate how to create a dynamic web server",
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"main": "index.js",
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"repository": {
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"type": "git",
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"url": "git+https://github.com/TrainingByPackt/Professional-JavaScript.git"
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},
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"license": "MIT",
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"dependencies": {
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"handlebars": "^4.1.2",
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"mime": "^2.4.4"
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}
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}

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