dashy/server.js

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/**
* 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
* */
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/* Import built-in Node server modules */
const fs = require('fs');
const os = require('os');
const dns = require('dns');
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const http = require('http');
const path = require('path');
const util = require('util');
const crypto = require('crypto');
/* Import NPM dependencies */
const yaml = require('js-yaml');
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/* Import Express + middleware functions */
const express = require('express');
const basicAuth = require('express-basic-auth');
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
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let config = {}; // setup the config
config = require('./services/config-validator'); // Include and kicks off the config file validation script
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/* 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
const getUser = require('./services/get-user'); // Enables server side user lookup
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/* 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;
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/* Checks env var for port. If undefined, will use Port 8080 for Docker, or 4000 for metal */
const port = process.env.PORT || (isDocker ? 8080 : 4000);
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/* Checks env var for host. If undefined, will use 0.0.0.0 */
const host = process.env.HOST || '0.0.0.0';
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/* Indicates for the webpack config, that running as a server */
process.env.IS_SERVER = 'True';
/* 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) {
// No clue what could of gone wrong here, but print fallback message if above failed
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
};
/* Load appConfig.auth.users from config (if present) for authorization purposes */
function loadUserConfig() {
try {
const filePath = path.join(__dirname, process.env.USER_DATA_DIR || 'user-data', 'conf.yml');
const fileContents = fs.readFileSync(filePath, 'utf8');
const data = yaml.load(fileContents);
return data?.appConfig?.auth?.users || null;
} catch (e) {
return [];
}
}
/* If HTTP auth is enabled, and no username/password are pre-set, then check passed credentials */
function customAuthorizer(username, password) {
const sha256 = (input) => crypto.createHash('sha256').update(input).digest('hex').toUpperCase();
const generateUserToken = (user) => {
if (!user.user || (!user.hash && !user.password)) return '';
const strAndUpper = (input) => input.toString().toUpperCase();
const passwordHash = user.hash || sha256(process.env[user.password]);
const sha = sha256(strAndUpper(user.user) + strAndUpper(passwordHash));
return strAndUpper(sha);
};
if (password.startsWith('Bearer ')) {
const token = password.slice('Bearer '.length);
const users = loadUserConfig();
return users.some(user => generateUserToken(user) === token);
} else {
const users = loadUserConfig();
const userHash = sha256(password);
return users.some(user => (
user.user.toLowerCase() === username.toLowerCase() && user.hash.toUpperCase() === userHash
));
}
}
/* If a username and password are set, setup auth for config access, otherwise skip */
function getBasicAuthMiddleware() {
const configUsers = process.env.ENABLE_HTTP_AUTH ? loadUserConfig() : null;
const { BASIC_AUTH_USERNAME, BASIC_AUTH_PASSWORD } = process.env;
if (BASIC_AUTH_USERNAME && BASIC_AUTH_PASSWORD) {
return basicAuth({
users: { [BASIC_AUTH_USERNAME]: BASIC_AUTH_PASSWORD },
challenge: true,
unauthorizedResponse: () => 'Unauthorized - Incorrect username or password',
});
} else if ((configUsers && configUsers.length > 0)) {
return basicAuth({
authorizer: customAuthorizer,
challenge: true,
unauthorizedResponse: () => 'Unauthorized - Incorrect token',
});
} else {
return (req, res, next) => next();
}
}
const protectConfig = getBasicAuthMiddleware();
/* 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()
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// Load SSL redirection middleware
.use(sslServer.middleware)
// Load middlewares for parsing JSON, and supporting HTML5 history routing
.use(express.json({ limit: '1mb' }))
// 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 config file to disk
.use(ENDPOINTS.save, method('POST', (req, res) => {
try {
saveConfig(req.body, (results) => { res.end(results); });
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config = req.body.config; // update the config
} 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 endpoint to return user info
.use(ENDPOINTS.getUser, (req, res) => {
try {
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const user = getUser(config, req);
res.end(JSON.stringify(user));
} catch (e) {
res.end(JSON.stringify({ success: false, message: e }));
}
})
// Middleware to serve any .yml files in USER_DATA_DIR with optional protection
.get('/*.yml', protectConfig, (req, res) => {
const ymlFile = req.path.split('/').pop();
res.sendFile(path.join(__dirname, process.env.USER_DATA_DIR || 'user-data', ymlFile));
})
// Serves up static files
.use(express.static(path.join(__dirname, process.env.USER_DATA_DIR || 'user-data')))
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.use(express.static(path.join(__dirname, 'dist')))
.use(express.static(path.join(__dirname, 'public'), { index: 'initialization.html' }))
.use(history())
// If no other route is matched, serve up the index.html with a 404 status
.use((req, res) => {
res.status(404).sendFile(path.join(__dirname, 'dist', 'index.html'));
});
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/* 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);
});
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/* Check, and if possible start SSL server too */
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sslServer.startSSLServer(app);