var express = require("express");
var formidable = require("formidable");
var serveIndex = require("serve-index");
var randomipa = require("random-ip");
var path = require("path");
var fs = require("fs");


const BASE_BLOCK = process.env.BASE_BLOCK || "2607:5600:c6:203::/64", BASE_IPA = BASE_BLOCK.split('/')[0], BASE_PREFIX = BASE_BLOCK.split('/')[1];


const FILES_DIR = "files";
const AUTH_TOKEN = fs.readFileSync("auth.txt", "utf8").trim();
var app = express();

app.use((req, res, next)=>{
	console.log(`[${new Date().toLocaleString()}]`, '📥', req.socket.remoteAddress, `"${req.method} ${req.url} HTTP/${req.httpVersion}"`, JSON.stringify(req.headers));
	res.on("finish", () => {
		console.log(`[${new Date().toLocaleString()}]`, '📤', res.statusCode, res.statusMessage, JSON.stringify(res.getHeaders()));
	});
	next();
});

app.post("/upload", (req, res, next) => {
	if (req.headers.authentication != AUTH_TOKEN) return res.status(403).send("Unauthorized");
	var form = new formidable.IncomingForm({
		maxFileSize: 2**30, // 1 GiB
		maxFields: 1,
		uploadDir: "tmp"
	});
	form.parse(req, function(err, fields, files) {
		if (err) return next(err);
		var file = files.file;
		if (!file) return res.sendStatus(400);
		do {
			var ipv6 = randomipa(BASE_IPA, BASE_PREFIX);
			var filedir = path.join(FILES_DIR, `[${ipv6}]`);
		} while ( fs.existsSync(filedir) && !console.log("oof") );
		try {
			fs.mkdirSync(filedir);
			fs.renameSync(file.path, path.join(filedir, file.name));
		} catch(e) {
			return next(e);
		}
		require("child_process").execSync(`ip addr add ${ipv6} dev eth0`);
		fs.appendFileSync("@reboot.sh", `ip addr add ${ipv6} dev eth0\n`); // :lul:
		res.send(`http://[${ipv6}]/`);
	});
});

app.get("*", function(req, res, next){
	let filecode = req.headers.host;
	let webroot = path.join(FILES_DIR, filecode);
	let webrootdirlist = fs.readdirSync(webroot);
	if (webrootdirlist.length > 1) {
		req.url = path.join(filecode, req.url);
		next();
	} else if (webrootdirlist.length == 1) {
		res.sendFile(webrootdirlist[0], {
			root: path.join(process.cwd(), webroot),
			headers: {"Content-Disposition": `filename=${webrootdirlist[0]}`}
		});
	} else {
		res.sendStatus(204);
	}
});

app.get("*", express.static(FILES_DIR), serveIndex(FILES_DIR, {icons: true}));

app.use(function (error, req, res, next) {
	res.status(error.code == "ENOENT" ? 404 : console.error(error.stack) || 500).send(error.toString());
});

app.listen(process.env.PORT || 80, process.env.ADDRESS || "::");