app.js

/**
 * @file app.js
 * @breif main file
 */

const express = require('express')
const path = require('path')
const os = require('os')
const mongoose = require('mongoose')
const https = require('./middleware/https.middleware')
const startWSS = require('./socket/wss')
require('dotenv').config()

//подключение переменных среды
const devMode = process.env.NODE_ENV === "dev"
const PORT = process.env.PORT || 5000
const mongoUri = process.env.mongoUri
const httpsRedirect = process.env.httpsRedirect || false
const WS_PORT = process.env.WS_PORT || 3030

const app = express()

app.use(express.json({ extended: true, limit: "1mb" }))

app.get('/getSocketAddress', (req, res) => {
    getIp()
        .then((ip) => {
            const socketAddress = ((req.protocol === 'https' || httpsRedirect) ? "wss" : "ws") + "://" + (ip || "localhost") + ":" + WS_PORT
            res.status(200).json({ socketAddress })
        })
        .catch(() => res.status(500))
})


/**
 * подключение роутов
 */
app.use('/api/auth', require('./routes/auth.routes'))
app.use('/api/notes', require('./routes/notes.routes'))
app.use('/api/media', require('./routes/media.routes'))


if (httpsRedirect) app.use(https)

/**
 * подключение статической библиотеки клиента
 */
if (!devMode) {
    const clientPath = '../client/build'
    app.use('/', express.static(path.join(__dirname, clientPath)))
    app.get('*', (req, res) => {
        res.sendFile(path.resolve(__dirname, clientPath, 'index.html'))
    })
} else {
    app.get('*', (req, res) => {
        res.send("[Backend] NODE_ENV is 'dev'")
    })
}

/**
 * запуск сервера
 */
async function start() {
    try {
        connectMongo(mongoUri)
        startWSS(WS_PORT)
        app.listen(PORT, logServerStart)
    } catch (e) {
        console.log('Server Error', e.message)
        process.exit(1)
    }
}

start()

/**
 * подключение к MongoDb
 * @param {*} mongoUri 
 */
async function connectMongo(mongoUri) {
    if (mongoUri) {
        await mongoose.connect(mongoUri, {
            useNewUrlParser: true,
            useUnifiedTopology: true,
            useCreateIndex: true
        })
    } else {
        console.log("\n!!!NO MONGO URI!!!")
    }
}

/**
 * Вывод информации о сервере
 */
async function logServerStart() {
    const [logName, sBef, sAft] = devMode ? ['Express server', ' ', ':'] : ['React Notes App', '-', '']
    const ip = await getIp()
    console.log(`\n${logName} has been started`)
    console.log(`${sBef} Local${sAft}            http://localhost:${PORT}`)
    console.log(`${sBef} On Your Network${sAft}  http://${ip}:${PORT}\n`)
}

/**
 * Получение ip сервера
 */
function getIp() {
    return new Promise((res, rej) => {
        require('dns').lookup(os.hostname(), (err, addr) => {
            addr ? res(addr) : rej()
            err && console.log(err)
        })
    })
}