shop-api/src/app.ts

import compression from "compression";
import cors from "cors";
import express, { Application } from "express";
import { Container } from "inversify";
import { InversifyExpressServer } from "inversify-express-utils";
import morgan from "morgan";

import { errorHandler, lastHandler, notFoundHandler } from "./core/app/app.errorHandler";
import { appConfig } from "./core/config/app.config";
import { Logger } from "./core/logging/logger";
import { customMorganFormat, stream } from "./core/logging/morgan";
import { containerModules } from "./IOC/ioc.config";
import { IOCTYPES } from "./IOC/ioc.types";
import { PassportAuth } from "./utils/passport.service";
import { setupSwagger } from "./utils/swagger";

//controller
import "./modules/admin";
import "./modules/brand/brand.controller";
import "./modules/warranty/warranty.controller";
import "./modules/shipment/shipment.controller";
import "./modules/category/category.controller";
import "./modules/product/product.controller";
import "./modules/seller/seller.controller";
import "./modules/user/user.controller";
import "./modules/cart/cart.controller";
import "./modules/Coupon/coupon.controller";
import "./modules/order/order.controller";
import "./modules/return/return.controller";
import "./modules/blog/blog.controller";
import "./modules/landing/landing.controller";
import "./modules/ticket/ticket.controller";
import "./modules/chat/chat.controller";
import "./modules/job/job.controller";
import "./modules/faq/faq.controller";
import "./modules/notification/notification.controller";
import "./modules/wallet/wallet.controller";
import "./modules/payment/payment.controller";
import "./modules/address/address.controller";
import "./modules/newsletter/newsletter.controller";
import "./modules/contact-us/contactUs.controller";
import "./modules/cancel/cancel.controller";
import "./modules/about-us/aboutUs.controller";
import "./modules/learning/learning.controller";
import "./modules/fine/fine.controller";
import "./modules/media/media.controller";
import "./modules/site-setting/siteSetting.controller";
import "./modules/shop/shop.controller";
import "./modules/ping";

class App {
  private readonly _container: Container;
  //   private readonly _port: number;
  private logger = new Logger();

  constructor(container: Container) {
    this._container = container;
    // this._port = port;
    this.loadModules();
  }

  private async loadModules() {
    await this._container.loadAsync(containerModules);
  }

  public Build(): Application {
    const server = new InversifyExpressServer(this._container, null /*,{ rootPath: "/api" }*/);

    return server
      .setConfig(async (app) => {
        await this.setMiddleware(app);
      })
      .setErrorConfig((app) => {
        this.catchError(app);
      })
      .build();
    //   .listen(this._port, () => {
    //     this.logger.info(`listening on http://localhost:${this._port}`);
    //   });
  }

  private async setMiddleware(app: Application) {
    //remove x-powered-by header from response
    app.disable("x-powered-by");
    this.logger.debug("disable the default x header of express");
    /**
     * trust for reverse proxy to get correct ip address of user
     * Configure based on deployment environment
     */
    const trustedProxies = process.env.TRUSTED_PROXIES;
    const trustProxyHops = process.env.TRUST_PROXY_HOPS;

    if (trustedProxies === "true") {
      //  recommended for production with multiple proxies/CDNs
      app.set("trust proxy", 1);
      this.logger.debug("trust proxy enabled for first hop only (production with CDN/proxies)");
    } else if (trustProxyHops && !isNaN(parseInt(trustProxyHops))) {
      // Trust specific number of proxy hops
      const hops = parseInt(trustProxyHops);
      app.set("trust proxy", hops);
      this.logger.debug(`trust proxy enabled for ${hops} hops`);
    } else if (trustedProxies && trustedProxies !== "false") {
      // Trust specific proxy IPs (comma-separated list)
      const proxyList = trustedProxies.split(",").map((ip) => ip.trim());
      app.set("trust proxy", proxyList);
      this.logger.debug(`trust proxy enabled for specific IPs: ${trustedProxies}`);
    } else if (process.env.NODE_ENV === "development") {
      // For development, allow localhost proxies
      app.set("trust proxy", "loopback");
      this.logger.debug("trust proxy enabled for development (loopback only)");
    } else {
      // Production without reverse proxy - don't trust any proxies
      app.set("trust proxy", false);
      this.logger.debug("trust proxy disabled for security");
    }
    // app.get("/ip", (request, response) => response.send(request.ip));

    /**
     * compress the response
     */
    app.use(compression());

    /**
     * configure body parser
     */
    app.use(express.json());

    /**
     * configure morgan for http logging
     */
    app.use(morgan(customMorganFormat, { stream }));

    /**
     * configure cors
     */
    app.use(cors(appConfig.cors));

    /**
     * config passport
     */
    const passportAuth = this._container.get<PassportAuth>(IOCTYPES.PassportAuth);
    app.use(passportAuth.initialize());
    passportAuth.plug();

    /**
     * swagger document
     */
    setupSwagger(app);
    this.logger.debug("setup swagger docs");
  }

  private catchError(app: Application) {
    app.use(notFoundHandler());
    app.use(errorHandler());
    app.use(lastHandler());
  }
}

export { App };