app.js

/* eslint-disable lodash/prefer-lodash-method */
/* eslint-env node */
/* eslint no-unused-vars: ["error", { "args": "none" }]*/
const path = require('path');
const createError = require('http-errors');
const cookieParser = require('cookie-parser');
const compression = require('compression');
const cors = require('cors');
const proxy = require('express-http-proxy');
const express = require('express');
const authHeader = require('basic-auth-header');
const SSE = require('express-sse');
const morgan = require('morgan');
const ShellyFinder = require('./coapShellyList.js')

const indexRouter = require('./routes/index');
const apiRouter = require('./routes/api');
const app = express();

const sse = new SSE([], { isSerialized: false, initialEvent: 'shellysLoad' });

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

app.use(morgan('dev'));
app.use(cors());
app.options('*', cors()) // include before other routes
app.enable('trust proxy', process.env.TRUSTPROXY);
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(process.env.PREFIX, express.static(path.join(__dirname, 'public')));
// Add handler for client to be able to request no compression. This is required for express-sse
app.use(compression({
  filter: function (req, res) {
    return (req.headers['x-no-compression']) ? false : compression.filter(req, res);
  }
}));
app.use(path.join(process.env.PREFIX, '/'), indexRouter);
app.use(path.join(process.env.PREFIX, '/api'), apiRouter);
app.use(path.join(process.env.PREFIX, '/proxy/:deviceKey'), proxy(function (req, res) {
  const deviceKey = req.params.deviceKey;
  const shelly = app.locals.shellylist[deviceKey];
  return 'http://' + shelly.ip;
}, {
  userResDecorator: function (proxyRes, proxyResData, userReq, userRes) {
    let data = proxyResData.toString('utf8');
    const regex = /,\s*url:\s*?"\/"\s*?\+\s*?url,/g;
    data = data.replaceAll(regex, ', url: ""+url,');
    return data;
  },
  proxyReqOptDecorator: function (proxyReqOpts, srcReq) {
    const deviceKey = proxyReqOpts.params.deviceKey;
    const shelly = app.locals.shellylist[deviceKey];
    if (shelly.auth) {
      console.warn('Need to add auth headers for this device');
      proxyReqOpts.headers['Authorization'] = authHeader(shelly.shellyuser, shelly.shellypassword);
    }
    return proxyReqOpts;
  }
}
));
app.get(path.join(process.env.PREFIX, '/events'), sse.init);

// catch 404 and forward to error handler
app.use(function (req, res, next) {
  next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

const shellycoap = new ShellyFinder(sse);
shellycoap.start(app);

module.exports = app;