feat: Basic setup with auth

common/interceptors/response.interceptor.ts

@@ -0,0 +1,72 @@
+import {
+  Injectable,
+  NestInterceptor,
+  ExecutionContext,
+  CallHandler,
+} from '@nestjs/common';
+import { DataResponse, MessageResponse } from 'common/http';
+import { Observable } from 'rxjs';
+import { map } from 'rxjs/operators';
+
+@Injectable()
+export class ResponseInterceptor<T> implements NestInterceptor<T, any> {
+  intercept(_: ExecutionContext, next: CallHandler): Observable<any> {
+    return next.handle().pipe(
+      map((data) => {
+        if (data instanceof MessageResponse) return data;
+        else if (data instanceof DataResponse) return data;
+        else if (typeof data === 'string') return new MessageResponse(data);
+        return new DataResponse(data);
+      }),
+    );
+  }
+}
+
+/* NOTE: How to access request
+ *
+  @Injectable()
+  export class ResponseInterceptor<T> implements NestInterceptor<T, any> {
+    intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
+      const req = context.switchToHttp().getRequest();
+      req.userId = 'ram';
+      return next.handle();
+      // return next.handle().pipe(
+      //   map((data) => {
+      //     if (data instanceof MessageResponse) return data;
+      //     else if (data instanceof DataResponse) return data;
+      //     else if (typeof data === 'string') return new MessageResponse(data);
+      //     return new DataResponse(data);
+      //   }),
+      // );
+    }
+  }
+
+REQUEST
+  ↓
+Guards
+  ↓
+Interceptors (before)
+  ↓
+Pipes
+  ↓
+Controller method
+  ↓
+Interceptors (after)  ← YOU ARE HERE
+  ↓
+Response
+
+
+3️⃣ What is next.handle() really?
+next.handle(): Observable<T>
+
+
+This is:
+
+An RxJS stream of whatever the controller returns
+
+Not the request
+
+Not the response object
+
+Just the return value
+ * */