add etag to apps.json

console-api/src/update/update.controller.ts

@@ -11,15 +11,21 @@ export class UpdateController {
   constructor(private readonly updateService: UpdateService) {}
   @Get('apps.json')
   @ApiOperation({ summary: '获取 apps.json', description: '懒得解释这是啥了……' })
-  @Header('Cache-Control', 'public, max-age=600, stale-while-revalidate=600, stale-if-error=604800')
-  getAppsJson() {
-    return this.updateService.getAppsJson();
+  async getAppsJson(@Res({ passthrough: true }) res: Response) {
+    const result = await this.updateService.getAppsJson();
+    this.addETag(res, JSON.stringify(result));
+    res.setHeader('Cache-Control', 'public, max-age=600, stale-while-revalidate=600, stale-if-error=604800');
+    return result;
+  }
+
+  private addETag(res: Response, data: any) {
+    const hash = createHash('sha512').update(JSON.stringify(data)).digest('hex');
+    res.setHeader('ETag', `"${hash}"`);
   }
 
   private async cacheResult<T>(res: Response, prom: Promise<T>) {
     const result = await prom;
-    const hash = createHash('sha512').update(JSON.stringify(result)).digest('hex');
-    res.setHeader('ETag', `"${hash}"`); // minio-compatibility requires quotes
+    this.addETag(res, result);
     if (res.getHeader('Cache-Control') === undefined) res.setHeader('Cache-Control', 'public, max-age=31536000, immutable');
     return result;
   }