Initial commit: LACA parking management system

backend/src/common/interceptor/transform.response.interceptor.ts

@@ -0,0 +1,41 @@
+import {
+  Injectable,
+  NestInterceptor,
+  ExecutionContext,
+  CallHandler,
+  StreamableFile,
+} from '@nestjs/common';
+import { Observable } from 'rxjs';
+import { map } from 'rxjs/operators';
+import { DEFAULT_SUCCESS_MSG } from 'src/share/constans';
+
+export interface Response<T> {
+  statusCode: number;
+  message: string;
+  data: T;
+}
+
+@Injectable()
+export class TransformResponseInterceptor<T>
+  implements NestInterceptor<T, Response<T> | StreamableFile>
+{
+  intercept(
+    context: ExecutionContext,
+    next: CallHandler,
+  ): Observable<Response<any> | StreamableFile> {
+    return next.handle().pipe(
+      map((data) => {
+        if (data instanceof StreamableFile) {
+          return data;
+        }
+        return {
+          statusCode:
+            <number>data?.statusCode ||
+            <number>context.switchToHttp().getResponse().statusCode,
+          message: <string>data?.message || DEFAULT_SUCCESS_MSG,
+          data: data,
+        };
+      }),
+    );
+  }
+}