FileSharer/index.js

const express = require("express"),
fs = require("fs"),
path = require("path"),
multer = require("multer"),
bodyParser = require("body-parser")

var app = express()

var uploads = multer({ storage: multer.memoryStorage() })

var PORT = process.env.PORT || 8080

var directory = process.env.FILES_DIR
var passwd = process.env.PASSWORD

var baseHTML = fs.readFileSync(path.join(__dirname, 'resources/base.html')).toString()
var baseStart = baseHTML.substring(0, baseHTML.indexOf('{CONTENT}'))
var baseEnd = baseHTML.substring(baseHTML.indexOf('{CONTENT}') + 9, baseHTML.length)

if (!directory) {
    console.error("No directory specified! Please specify one using the environment variable FILES_DIR.")
    return
}

app.use('/b', express.static(directory))
app.use(express.static(path.join(__dirname, 'static')))

app.use(bodyParser.urlencoded({ extended: false }))

app.listen(PORT, () => {
    console.log("Now listening on PORT: " + PORT)

    if (!passwd) {
        console.log("Password variable not found. Uploading from site is not available.")
    } else {
        console.log("Password variable found! Uploads are now available on the site.")
    }
})

app.get("/b*", (req, res) => {
    var file = req.params[0]
    var absPath = path.join(directory, file)
    
    res.setHeader('Content-Type', 'text/html')

    try {
        var dirContents = fs.readdirSync(absPath)
    } catch (error) {
        res.send(baseStart + "<h2>404: not found!</h2>" + baseEnd)
        return
    }

    res.write(baseStart)

    res.write('<a href="../">Parent Directory</a><br>')

    for (let index = 0; index < dirContents.length; index++) {
        const file = dirContents[index];
        res.write(`<a href="./${file}">${file}</a><br>`)
    }
    if (passwd) {
        res.write(`<br><a href="/dashboard.html?folder=${file}">Dashboard page for this folder</a><br>`)
    }

    res.write(baseEnd)

    res.end()
})

app.get("/", (req, res) => {
    res.redirect("/b")
})

if (passwd) {
    app.get("/dashboard.html", (req, res) => {
        var html = fs.readFileSync(path.join(__dirname, 'resources/dashboard.html')).toString()
        while (html.includes("{DIRECTORY}")) {
            html = html.replace("{DIRECTORY}", req.query.folder)
        }

        res.send(html)
    })

    app.post("/upload", uploads.single('file'), (req, res) => {
        var file = req.file
        fs.writeFileSync(path.join(__dirname, req.body.directory, file.originalname), file.buffer)
    
        res.redirect(req.body.directory)
    })

    app.post("/mkdir", bodyParser.urlencoded({ extended: false }), (req, res) => {
        fs.mkdirSync(path.join(__dirname, req.body.directory, req.body.name))

        res.redirect(req.body.directory)
    })
}