/** * This is the main entry point for the application, a simple server that * runs some checks, and then serves up the app from the ./dist directory * Also imports some routes for status checks/ ping and config saving * Note: The app must first be built (yarn build) before this script is run * */ /* Import built-in Node server modules */ const http = require('http'); const path = require('path'); const util = require('util'); const dns = require('dns'); const os = require('os'); /* Import Express + middleware functions */ const express = require('express'); const history = require('connect-history-api-fallback'); /* Kick of some basic checks */ require('./services/update-checker'); // Checks if there are any updates available, prints message require('./services/config-validator'); // Include and kicks off the config file validation script /* Include route handlers for API endpoints */ const statusCheck = require('./services/status-check'); // Used by the status check feature, uses GET const saveConfig = require('./services/save-config'); // Saves users new conf.yml to file-system const rebuild = require('./services/rebuild-app'); // A script to programmatically trigger a build const systemInfo = require('./services/system-info'); // Basic system info, for resource widget const sslServer = require('./services/ssl-server'); // TLS-enabled web server const corsProxy = require('./services/cors-proxy'); // Enables API requests to CORS-blocked services /* Helper functions, and default config */ const printMessage = require('./services/print-message'); // Function to print welcome msg on start const ENDPOINTS = require('./src/utils/defaults').serviceEndpoints; // API endpoint URL paths /* Checks if app is running within a container, from env var */ const isDocker = !!process.env.IS_DOCKER; /* Checks env var for port. If undefined, will use Port 80 for Docker, or 4000 for metal */ const port = process.env.PORT || (isDocker ? 80 : 4000); /* Checks env var for host. If undefined, will use 0.0.0.0 */ const host = process.env.HOST || '0.0.0.0'; /* Attempts to get the users local IP, used as part of welcome message */ const getLocalIp = () => { const dnsLookup = util.promisify(dns.lookup); return dnsLookup(os.hostname()); }; /* Gets the users local IP and port, then calls to print welcome message */ const printWelcomeMessage = () => { try { getLocalIp().then(({ address }) => { const ip = process.env.HOST || address || 'localhost'; console.log(printMessage(ip, port, isDocker)); // eslint-disable-line no-console }); } catch (e) { // Fetching info for welcome message failed, print simple msg instead console.log(`Dashy server has started (${port})`); // eslint-disable-line no-console } }; /* Just console.warns an error */ const printWarning = (msg, error) => { console.warn(`\x1b[103m\x1b[34m${msg}\x1b[0m\n`, error || ''); // eslint-disable-line no-console }; /* A middleware function for Connect, that filters requests based on method type */ const method = (m, mw) => (req, res, next) => (req.method === m ? mw(req, res, next) : next()); const app = express() // Load SSL redirection middleware .use(sslServer.middleware) // Serves up static files .use(express.static(path.join(__dirname, 'dist'))) .use(express.static(path.join(__dirname, 'public'), { index: 'initialization.html' })) // Load middlewares for parsing JSON, and supporting HTML5 history routing .use(express.json({ limit: '1mb' })) .use(history()) // GET endpoint to run status of a given URL with GET request .use(ENDPOINTS.statusCheck, (req, res) => { try { statusCheck(req.url, async (results) => { await res.end(results); }); } catch (e) { printWarning(`Error running status check for ${req.url}\n`, e); } }) // POST Endpoint used to save config, by writing conf.yml to disk .use(ENDPOINTS.save, method('POST', (req, res) => { try { saveConfig(req.body, (results) => { res.end(results); }); } catch (e) { printWarning('Error writing config file to disk', e); res.end(JSON.stringify({ success: false, message: e })); } })) // GET endpoint to trigger a build, and respond with success status and output .use(ENDPOINTS.rebuild, (req, res) => { rebuild().then((response) => { res.end(JSON.stringify(response)); }).catch((response) => { res.end(JSON.stringify(response)); }); }) // GET endpoint to return system info, for widget .use(ENDPOINTS.systemInfo, (req, res) => { try { const results = systemInfo(); systemInfo.success = true; res.end(JSON.stringify(results)); } catch (e) { res.end(JSON.stringify({ success: false, message: e })); } }) // GET for accessing non-CORS API services .use(ENDPOINTS.corsProxy, (req, res) => { try { corsProxy(req, res); } catch (e) { res.end(JSON.stringify({ success: false, message: e })); } }) // GET fallback endpoint .get('*', (req, res) => res.sendFile(path.join(__dirname, 'dist', 'index.html'))); /* Create HTTP server from app on port, and print welcome message */ http.createServer(app) .listen(port, host, () => { printWelcomeMessage(); }) .on('error', (err) => { printWarning('Unable to start Dashy\'s Node server', err); }); /* Check, and if possible start SSL server too */ sslServer.startSSLServer(app);