feat: set up basic express server configuration

This commit adds different middlewares to the express server such as cors, helmet for security, json and url-encoded body parsers, and gzip compression. Additionally, server start logic including router configuration and MongoDB service instantiation are also handled.

src/app.ts

@@ -0,0 +1,66 @@
+import * as process from "node:process";
+import { MongodbService } from "@services/databases/mongodb.service";
+import { EnvUtils } from "@utils/env.util";
+import { LogsUtils } from "@utils/logs.util";
+import compression from "compression";
+import cors from "cors";
+import express, { type Express } from "express";
+import helmet from "helmet";
+
+console.log("\n\n> Starting...\n\n\n\n");
+
+const logger = new LogsUtils("App");
+const envs = new EnvUtils("App");
+
+const app: Express = express();
+
+// enable cors
+app.use(cors());
+app.options("*", cors());
+
+// enable xss sanitizer
+app.use(
+	helmet({
+		xXssProtection: true,
+	}),
+);
+app.use(helmet.xXssProtection());
+
+// parse json request body
+app.use(express.json());
+
+// parse urlencoded request body
+app.use(
+	express.urlencoded({
+		extended: true,
+	}),
+);
+
+// gzip compression
+app.use(compression());
+
+try {
+	//app.use("/auth", AuthRouter);
+	logger.info("Routers loaded !");
+} catch (err) {
+	logger.error(err);
+	throw null;
+}
+
+try {
+	const port = envs.get("APP_PORT") || "3000";
+	app.listen(Number.parseInt(port));
+	logger.info(
+		`Server is running ! (port:${port})`,
+		`Memory total: ${Math.round(
+			process.memoryUsage().rss / 1_000_000,
+		)} Mio\n - Memory used by V8: ${Math.round(
+			process.memoryUsage().heapUsed / 1_000_000,
+		)} Mio`,
+	);
+} catch (error) {
+	logger.error(`Server failed to start: ${error}`);
+	process.exit(1);
+}
+
+const mongo = new MongodbService("App");