dok/app.js

require("dotenv").config();

const express = require("express");
const path = require("path");
const helmet = require("helmet");
const rateLimit = require("express-rate-limit");
const http = require("http");
const { Server } = require("socket.io");
const db = require("./database/database");

const serverRoutes = require("./routes/servers");
const registerRoutes = require("./routes/register");
const verifyRoutes = require("./routes/verify");
const characterRoutes = require("./routes/character");
const session = require("express-session");
const loginRoutes = require("./routes/login");
const launcherRoutes = require("./routes/launcher");
const buildingRoutes = require("./routes/buildings");

const app = express();
const PORT = process.env.PORT || 3000;

/* ========================
   Chatserver
======================== */

const server = http.createServer(app);
const io = new Server(server);

/* ========================
   Security Middleware
======================== */

app.use(
  helmet({
    contentSecurityPolicy: {
      directives: {
        defaultSrc: ["'self'"],
        scriptSrc: ["'self'", "'unsafe-inline'"],
        styleSrc: ["'self'", "'unsafe-inline'"],
        imgSrc: ["'self'", "data:"],
        connectSrc: ["'self'", "ws:", "wss:"],
      },
    },
  }),
);

const limiter = rateLimit({
  windowMs: 15 * 60 * 1000,
  max: 100,
});

app.use(limiter);

app.use(
  session({
    secret: "dynastyofknights_secret",
    resave: false,
    saveUninitialized: false,
  }),
);

/* ========================
   Express Settings
======================== */

app.set("view engine", "ejs");
app.set("views", path.join(__dirname, "views"));

/* ========================
   Route für Ajax für Gebäude
======================== */

app.get("/api/building/:id", async (req, res) => {
  const buildingId = req.params.id;
  const userId = req.session.user.id;

  try {
    const [userBuilding] = await db.query(
      "SELECT level, points FROM user_buildings WHERE user_id=? AND building_id=?",
      [userId, buildingId],
    );

    let building;

    if (!userBuilding.length) {
      await db.query(
        "INSERT INTO user_buildings (user_id,building_id,level,points) VALUES (?,?,1,0)",
        [userId, buildingId],
      );

      building = { level: 1, points: 0 };
    } else {
      building = userBuilding[0];
    }

    const [nextLevel] = await db.query(
      "SELECT required_points, wood, stone FROM building_levels WHERE building_id=? AND level=?",
      [buildingId, building.level + 1],
    );

    const [info] = await db.query(
      "SELECT name,description,history FROM buildings WHERE id=?",
      [buildingId],
    );

    res.json({
      name: info[0].name,
      level: building.level,
      points: building.points,
      nextLevelPoints: nextLevel[0]?.required_points || null,
      description: info[0].description,
      history: info[0].history,
      upgradeCost: `${nextLevel[0]?.wood} Holz, ${nextLevel[0]?.stone} Stein, ${nextLevel[0]?.gold} Gold`,
    });
  } catch (err) {
    console.error(err);
    res.status(500).json({ error: "DB Fehler" });
  }
});

/* ========================
   Body Parser
======================== */

app.use(express.json());
app.use(express.urlencoded({ extended: true }));

/* ========================
   Static Files
======================== */

app.use(express.static(path.join(__dirname, "public")));

/* ========================
   Routes
======================== */

app.use("/", serverRoutes);
app.use("/register", registerRoutes);
app.use("/verify", verifyRoutes);
app.use("/create-character", characterRoutes);
app.use("/login", loginRoutes);
app.use("/launcher", launcherRoutes);
app.use("/", buildingRoutes);

/* ========================
   404 Handler
======================== */

app.use((req, res) => {
  res.status(404).send("Seite nicht gefunden");
});

/* ========================
   Webseite beschleunigen
======================== */
const compression = require("compression");
app.use(compression());

/* ========================
   Chat System
======================== */

let onlineUsers = {};

io.on("connection", (socket) => {
  console.log("Spieler verbunden");

  socket.on("register", (username) => {
    const name = String(username);

    socket.user = name;

    onlineUsers[name] = socket.id;

    io.emit("onlineUsers", Object.keys(onlineUsers));
  });

  socket.on("disconnect", () => {
    if (socket.user) {
      delete onlineUsers[socket.user];
      io.emit("onlineUsers", Object.keys(onlineUsers));
    }
  });

  socket.on("chatMessage", (data) => {
    if (data.channel === "global") {
      io.emit("chatMessage", {
        user: socket.user,
        message: data.message,
        channel: "global",
      });
    }

    if (data.channel === "guild") {
      io.to("guild_" + data.guild).emit("chatMessage", {
        user: socket.user,
        message: data.message,
        channel: "guild",
      });
    }
  });

  socket.on("whisper", (data) => {
    const targetSocket = onlineUsers[data.to];

    if (!targetSocket) {
      socket.emit("systemMessage", {
        message: data.to + " ist offline",
      });

      return;
    }

    io.to(targetSocket).emit("chatMessage", {
      user: socket.user,
      message: data.message,
      channel: "private",
    });

    socket.emit("chatMessage", {
      user: "(an " + data.to + ")",
      message: data.message,
      channel: "private",
    });
  });

  socket.on("privateMessage", (data) => {
    const target = onlineUsers[data.to];

    if (target) {
      io.to(target).emit("chatMessage", {
        user: socket.user,
        message: data.message,
        channel: "private",
      });
    }
  });
});

/* ========================
   Server Start
======================== */

server.listen(PORT, () => {
  console.log(`Dynasty of Knights Server läuft auf http://localhost:${PORT}`);
});