280 lines
10 KiB
JavaScript
280 lines
10 KiB
JavaScript
const path = require('path');
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const fs = require('fs');
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const express = require('express');
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const http = require('http');
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const socketio = require('socket.io');
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const helmet = require('helmet');
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const bodyParser = require('body-parser');
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const fileUpload = require('express-fileupload');
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const filenamify = require('filenamify');
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const unusedFilename = require('unused-filename');
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const snarkdown = require('snarkdown');
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const settings = require('./settings.json');
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function Server () {
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this.server = express();
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this.http = http.Server(this.server);
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this.io = socketio(this.http);
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this.fileLocation = path.resolve(settings.fileLocation);
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this.historyLocation = path.resolve(settings.historyLocation);
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this.templateCache = {};
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this.takenBooks = [];
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this.server.use(helmet());
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this.server.use(bodyParser.json()); // support json encoded bodies
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this.server.use(bodyParser.urlencoded({ extended: true })); // support encoded bodies
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this.server.use(fileUpload({ // support file uploads
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abortOnLimit: true,
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limits: {
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fileSize: (settings.maxFileSize > 0 ? settings.maxFileSize * 1024 * 1024 : Infinity), // filesize in bytes (settings accepts MB)
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},
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}));
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this.server.use(express.static(path.join(__dirname, './public/files/')));
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this.server.use(express.static(path.join(__dirname, './public/history/')));
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this.server.use('/js', express.static(path.join(__dirname, './public/js/')));
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this.server.use('/js', express.static(path.resolve('./node_modules/jquery/dist/')));
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this.server.use('/js', express.static(path.resolve('./node_modules/socket.io-client/dist/')));
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this.server.use('/css', express.static(path.resolve('./node_modules/bulma/css/')));
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this.server.use('/css', express.static(path.join(__dirname, './public/css/')));
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this.server.get('/', (req, res) => {
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const html = this.generateHomePage();
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if (html) {
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res.send(html);
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} else {
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res.send('Something went wrong!');
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}
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});
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this.server.get('/give', (req, res) => {
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const body = this.fillTemplate('./templates/pages/uploadForm.html');
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const html = this.fillTemplate('./templates/htmlContainer.html', { title: 'Give a Book', body });
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res.send(html);
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});
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this.server.post('/give', (req, res) => {
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if (Object.keys(req.files).length > 0
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&& req.body.hasOwnProperty('title') && req.body.title.trim() !== ''
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&& req.body.hasOwnProperty('summary') && req.body.summary.trim() !== '') {
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const { book } = req.files;
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const { title, author, summary, contributor } = req.body;
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const fileType = book.name.substr(book.name.lastIndexOf('.'));
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this.addBook({ book, title, author, summary, contributor, fileType }, () => {
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const messageBox = this.fillTemplate('./templates/elements/messageBox.html', {
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style: 'is-success',
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header: 'Upload Successful',
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message: 'Thank you for your contribution!'
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});
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const modal = this.fillTemplate('./templates/elements/modal.html', {
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isActive: 'is-active',
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content: messageBox,
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});
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const body = this.fillTemplate('./templates/pages/uploadForm.html');
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const html = this.fillTemplate('./templates/htmlContainer.html', { title: 'Give a Book', body, modal });
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res.send(html);
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}, (err) => {
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const messageBox = this.fillTemplate('./templates/elements/messageBox.html', {
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style: 'is-danger',
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header: 'Upload Failed',
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message: err,
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});
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const modal = this.fillTemplate('./templates/elements/modal.html', {
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isActive: 'is-active',
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content: messageBox,
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});
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const body = this.fillTemplate('./templates/pages/uploadForm.html');
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const html = this.fillTemplate('./templates/htmlContainer.html', { title: 'Give a Book', body, modal });
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res.send(html);
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});
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} else {
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let errorMessage = '';
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if (Object.keys(req.files).length <= 0) {
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errorMessage += 'You have not selected a file.';
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}
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if (!req.body.hasOwnProperty('title') || req.body.title.trim() === '') {
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errorMessage += (errorMessage.length > 0 ? '<br>' : '') + 'You have not written a title.';
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}
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if (!req.body.hasOwnProperty('summary') || req.body.summary.trim() === '') {
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errorMessage += (errorMessage.length > 0 ? '<br>' : '') + 'You have not written a summary.';
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}
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const message = this.fillTemplate('./templates/elements/messageBox.html', {
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style: 'is-danger',
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header: 'Missing Required Fields',
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message: errorMessage,
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});
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const body = this.fillTemplate('./templates/pages/uploadForm.html');
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const html = this.fillTemplate('./templates/htmlContainer.html', { title: 'Give a Book', body, message });
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res.send(html);
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}
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});
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this.io.on('connection', socket => {
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this.broadcastVisitors();
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socket.on('take book', bookId => {
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const fileLocation = this.takeBook(bookId, socket.id);
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if (fileLocation) {
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console.log(socket.id + ' removed ' + bookId);
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const downloadLocation = fileLocation.substr(fileLocation.lastIndexOf('/'));
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socket.emit('get book', './files' + downloadLocation);
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}
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});
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socket.on('disconnect', () => {
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this.broadcastVisitors();
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this.deleteBooks(socket.id);
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});
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});
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}
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Server.prototype.fillTemplate = function (file, templateVars = {}) {
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let data;
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if (this.templateCache.hasOwnProperty(file)) {
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data = this.templateCache[file];
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} else {
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data = fs.readFileSync(path.join(__dirname, file), 'utf8');
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}
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if (data) {
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if (!this.templateCache.hasOwnProperty(file)) {
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this.templateCache[file] = data;
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}
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let filledTemplate = data.replace(/\{\{siteTitle\}\}/g, settings.siteTitle)
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.replace(/\{\{titleSeparator\}\}/g, settings.titleSeparator)
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.replace(/\{\{allowedFormats\}\}/g, settings.allowedFormats.join(','))
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.replace(/\{\{maxFileSize\}\}/g, (settings.maxFileSize > 0 ? settings.maxFileSize + 'MB' : 'no'));
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for (let templateVar in templateVars) {
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const regExp = new RegExp('\{\{' + templateVar + '\}\}', 'g')
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filledTemplate = filledTemplate.replace(regExp, templateVars[templateVar]);
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}
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// If any template variable is not provided, don't even render them.
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filledTemplate = filledTemplate.replace(/\{\{[a-zA-Z0-9\-_]+\}\}/g, '');
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return filledTemplate;
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}
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return data;
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}
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Server.prototype.generateHomePage = function () {
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const files = fs.readdirSync(this.fileLocation).filter(fileName => fileName.includes('.json'));
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const books = files.map(fileName => {
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const bookData = JSON.parse(fs.readFileSync(path.resolve(this.fileLocation, fileName), 'utf8'));
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const id = fileName.replace('.json', '');
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const header = '<h2 class="title">' + bookData.title + '</h2><h4 class="subtitle">' + bookData.author + '</h4>';
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const content = '<div class="content"><h4>Contributed by ' + bookData.contributor + '</h4>' + snarkdown(bookData.summary) + '</div>';
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const footer = '<a class="button close">Close</a> <a class="button is-success take-book">Take Book</a>';
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const modal = this.fillTemplate('./templates/elements/modalCard.html', {
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id,
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header,
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content,
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footer,
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});
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return this.fillTemplate('./templates/elements/book.html', {
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id,
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title: bookData.title,
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author: bookData.author,
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modal,
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});
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}).join('');
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const body = this.fillTemplate('./templates/pages/booksList.html', { books });
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return this.fillTemplate('./templates/htmlContainer.html', { title: 'View', body });
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}
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Server.prototype.broadcastVisitors = function () {
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const numberConnected = this.io.of('/').clients().connected.length;
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this.io.emit('connected', numberConnected);
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}
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Server.prototype.start = function () {
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this.http.listen(settings.port, () => {
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console.log('Started server on port ' + settings.port);
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});
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}
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Server.prototype.addBook = function (uploadData = {}, success = () => {}, error = () => {}) {
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const { book } = uploadData;
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const bookId = this.uuid4();
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const bookPath = path.resolve(this.fileLocation, bookId);
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const bookData = {
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title: uploadData.title.trim(),
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author: uploadData.author.trim(),
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summary: uploadData.summary.trim(),
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contributor: uploadData.contributor.trim(),
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fileType: book.name.substr(book.name.lastIndexOf('.')),
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}
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const bookFilePath = unusedFilename.sync(path.resolve(bookPath + bookData.fileType));
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return book.mv(bookFilePath, function (err) {
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if (err) {
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console.log(err);
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error(err);
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} else {
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const bookDataPath = unusedFilename.sync(path.resolve(bookPath + '.json'));
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fs.writeFileSync(bookDataPath, JSON.stringify(bookData));
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success();
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console.log('uploaded ' + bookData.title + ' to ' + bookFilePath + ', and saved metadata to ' + bookDataPath);
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}
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});
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}
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Server.prototype.takeBook = function (bookId, socketId) {
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return this.checkId(bookId, (bookPath, bookDataPath, bookData) => {
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const bookName = filenamify(bookData.title);
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const newFileName = unusedFilename.sync(path.resolve(this.fileLocation, bookName + bookData.fileType));
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bookData.fileName = newFileName;
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fs.renameSync(bookPath, newFileName);
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fs.writeFileSync(bookDataPath, JSON.stringify(bookData));
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takenBooks.push({ socketId, bookId });
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return newFileName;
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});
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}
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Server.prototype.checkId = function (bookId, callback = () => {}) {
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const bookDataPath = path.resolve(this.fileLocation, bookId + '.json');
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if (fs.existsSync(bookDataPath)) {
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const bookDataRaw = fs.readFileSync(bookDataPath);
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if (bookDataRaw) {
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const bookData = JSON.parse(bookDataRaw);
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const bookPath = path.resolve(this.fileLocation, bookId + bookData.fileType);
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if (fs.existsSync(bookPath)) {
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return callback(bookPath, bookDataPath, bookData);
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}
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}
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}
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return false;
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}
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Server.prototype.deleteBooks = function (socketId) {
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this.takenBooks.forEach(data => {
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if (data.socketId === socketId) {
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this.checkId(data.bookId, (bookPath, bookDataPath) => {
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fs.unlinkSync(bookPath);
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fs.renameSync(bookDataPath, path.resolve(this.historyLocation, data.bookId + '.json'));
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});
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}
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});
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this.takenBooks = this.takenBooks.filter(data => data.socketId === socketId);
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}
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Server.prototype.uuid4 = function () {
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// https://stackoverflow.com/a/2117523
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return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
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var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
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return v.toString(16);
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});
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}
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const server = new Server();
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server.start();
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