Merge pull request #11 from cuappdev/fanhao/version

Version endpoint

Author: yufanhao

src/constants.ts

@@ -4,6 +4,9 @@ export const EATERY_IMAGES_BASE_URL =
 export const DEFAULT_IMAGE_URL =
   'https://images-prod.healthline.com/hlcmsresource/images/AN_images/health-benefits-of-apples-1296x728-feature.jpg';
 
+export const ITUNES_LOOKUP_URL =
+  'https://itunes.apple.com/lookup?bundleId=org.cuappdev.eatery';
+
 export enum Weekday {
   SUNDAY = 'Sunday',
   MONDAY = 'Monday',

src/server.ts

@@ -12,8 +12,8 @@ import { requestLogger } from './middleware/logger.js';
 import { ipRateLimiter } from './middleware/rateLimit.js';
 import { prisma } from './prisma.js';
 import userRouter from './users/userRouter.js';
-import { cacheRouter } from './utils/cache.js';
-import { refreshCacheFromDB } from './utils/cache.js';
+import { cacheRouter, refreshCacheFromDB } from './utils/cache.js';
+import { versionRouter } from './utils/version.js';
 
 const app = express();
 
@@ -52,6 +52,7 @@ router.get('/health', async (_: Request, res: Response) => {
 // Public routes
 router.use('/auth', authRouter);
 router.use('/internal/cache', cacheRouter);
+router.use('/version', versionRouter);
 router.use('/eateries', eateryRouter);
 
 // Protected routes

src/utils/AppError.ts

@@ -6,6 +6,7 @@ export enum ErrorCodes {
   NOT_FOUND = 'NOT_FOUND', // 404
   CONFLICT = 'CONFLICT', // 409
   TOO_MANY_REQUESTS = 'TOO_MANY_REQUESTS', // 429
+  BAD_GATEWAY = 'BAD_GATEWAY', // 502
 }
 
 export class AppError extends Error {
@@ -85,3 +86,9 @@ export class TooManyRequestsError extends AppError {
     super(message, 429, ErrorCodes.TOO_MANY_REQUESTS, data);
   }
 }
+
+export class BadGatewayError extends AppError {
+  constructor(message: string = 'Bad Gateway', data?: Record<string, unknown>) {
+    super(message, 502, ErrorCodes.BAD_GATEWAY, data);
+  }
+}

src/utils/version.ts

@@ -0,0 +1,32 @@
+import { type Request, type Response, Router } from 'express';
+
+import { ITUNES_LOOKUP_URL } from '../constants.js';
+import { BadGatewayError } from './AppError.js';
+
+interface iTunesLookupResult {
+  resultCount: number;
+  results: Array<{ version?: string }>;
+}
+
+async function fetchAppVersion(): Promise<string> {
+  const response = await fetch(ITUNES_LOOKUP_URL);
+  const data = (await response.json()) as iTunesLookupResult;
+
+  if (!response.ok || !data.results?.length) {
+    throw new BadGatewayError('Failed to fetch app version from App Store');
+  }
+
+  const version = data.results[0]?.version;
+  if (!version) {
+    throw new BadGatewayError('Version not found in App Store response');
+  }
+
+  return version;
+}
+
+export const versionRouter = Router();
+
+versionRouter.get('/', async (_req: Request, res: Response) => {
+  const version = await fetchAppVersion();
+  return res.json({ version });
+});