index.js

const express = require("express");
const app = express();
const path = require("path");
const config = require("./config.json");

console.log("\n\n       db                                                                    88                      ")
console.log("      d88b                                                             ,d    \"\"                      ")
console.log("     d8'`8b                                                            88                            ")
console.log("    d8'  `8b     8b,dPPYba,  ,adPPYba, 88,dPYba,,adPYba,   ,adPPYba, MM88MMM 88  ,adPPYba, ,adPPYYba,")
console.log("   d8YaaaaY8b    88P'   \"Y8 a8\"     \"\" 88P'   \"88\"    \"8a a8P_____88   88    88 a8\"     \"\" \"\"     `Y8")
console.log("  d8\"\"\"\"\"\"\"\"8b   88         8b         88      88      88 8PP\"\"\"\"\"\"\"   88    88 8b         ,adPPPPP88")
console.log(" d8'        `8b  88         \"8a,   ,aa 88      88      88 \"8b,   ,aa   88,   88 \"8a,   ,aa 88,    ,88")
console.log("d8'          `8b 88          `\"Ybbd8\"' 88      88      88  `\"Ybbd8\"'   \"Y888 88  `\"Ybbd8\"' `\"8bbdP\"Y8\n\n")

const nodes = [ // optifine is really fickle and won't accept the ip of the nodebalancer, randomly dispersing queries between nodes manually instead
	"31.214.141.67"
];

function getNodeIp() {
	return nodes[Math.floor(Math.random() * nodes.length)];
}

function generateCapeEnding() {
	let out = "";
	Object.keys(config.thirdParties).forEach(item => {
		out += `&${item}=${config.thirdParties[item]}`;
	});
	return out;
}

function isPrivateIP(ip) {
	if (!ip.includes(".")) return false;
	var parts = ip.split(".");
	return parts[0] == "127" || parts[0] == "10" || (parts[0] == "172" && (parseInt(parts[1], 10) >= 16 && parseInt(parts[1], 10) <= 31)) || (parts[0] == "192" && parts[1] == "168");
}

app.get("/", (req, res) => {
	let host = req.headers.host;
	if (host.includes(":")) host = host.split(":")[0];
	let page = "normal";
	switch (host) {
		case "s.optifine.net":
			page = "installed";
			break;
		case "localhost":
			page = "local";
			break;
	}
	if (isPrivateIP(host)) page = "local";
  	res.sendFile(path.join(__dirname, "pages", page + ".html"));
});

app.get("/capes/:username", (req, res) => { // optifine
	var user = req.params.username;
	if (user.toLowerCase().endsWith(".png")) user = user.substring(0, user.length - 4);
	var url = "http://" + getNodeIp() + "/get/cloak?user=" + user + generateCapeEnding();
	res.redirect(302, url); // i tried this for ages in fastify and optifine wouldn't pick it up. giving up... for now
});

app.get("/MinecraftCloaks/:username", (req, res) => { // old minecraft
	var user = req.params.username;
	if (user.toLowerCase().endsWith(".png")) user = user.substring(0, user.length - 4);
	var url = "http://" + getNodeIp() + "/get/cloak?user=" + user + generateCapeEnding();
	res.redirect(302, url); // i tried this for ages in fastify and optifine wouldn't pick it up. giving up... for now
});

app.get("/MinecraftSkins/:username", (req, res) => { // old minecraft
	var user = req.params.username;
	if (user.toLowerCase().endsWith(".png")) user = user.substring(0, user.length - 4);
	var url = "http://" + getNodeIp() + "/get/skin?user=" + user + generateCapeEnding();
	res.redirect(302, url); // i tried this for ages in fastify and optifine wouldn't pick it up. giving up... for now
});

app.get("/items/:type/:id/:resource", (req, res) => { // cosmetic
	var type = req.params.type;
	var id = req.params.id;
	var resource = req.params.resource;
	if (!(["model", "texture"]).includes(resource)) return res.status(404).send("invalid resource");
	var url = "http://" + getNodeIp() + "/get/optifine" + resource + "?type=" + type + "&id=" + id + "&mustbeapproved";
	res.redirect(302, url);
});

app.get("/users/:username", (req, res) => {
	var username = req.params.username;
	if (username.toLowerCase().endsWith(".cfg")) {
		username = username.substring(0, username.length - 4);
	}
	var url = "http://" + getNodeIp() + "/get/optifineprofile?username=" + username;
	res.redirect(302, url);
});

app.use("/static", express.static("static"));

app.listen(config.port, () => {
	console.log("Server has started on port " + config.port);
});