sardell commented on code in PR #9855:
URL: https://github.com/apache/nifi/pull/9855#discussion_r2214380743


##########
nifi-frontend/src/main/frontend/apps/nifi-registry/src/app/service/droplets.service.ts:
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@@ -0,0 +1,64 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Injectable } from '@angular/core';
+import { Observable } from 'rxjs';
+import { HttpClient, HttpHeaders } from '@angular/common/http';
+
+@Injectable({ providedIn: 'root' })
+export class DropletsService {
+    private static readonly API: string = '../nifi-registry-api';
+
+    constructor(private httpClient: HttpClient) {}
+
+    getDroplets(bucketId?: string): Observable<any> {
+        if (bucketId) {
+            return 
this.httpClient.get(`${DropletsService.API}/items/${bucketId}`);
+        }
+        return this.httpClient.get(`${DropletsService.API}/items`);
+    }
+
+    deleteDroplet(href: string): Observable<any> {
+        return 
this.httpClient.delete(`${DropletsService.API}/${href}?version=0`);
+    }
+
+    createNewFlow(bucketUri: string, name: string, description: string): 
Observable<any> {
+        return 
this.httpClient.post(`${DropletsService.API}/${bucketUri}/flows`, {
+            name: name,
+            description: description
+        });
+    }
+
+    uploadFlow(flowUri: string, file: File, description: string): 
Observable<any> {
+        return 
this.httpClient.post(`${DropletsService.API}/${flowUri}/versions/import`, file, 
{
+            headers: { Comments: description }
+        });
+    }
+
+    exportDropletVersionedSnapshot(dropletUri: string, versionNumber: number): 
Observable<any> {
+        const headers = new HttpHeaders({ 'Content-Type': 'application/json' 
});
+        return 
this.httpClient.get(`${DropletsService.API}/${dropletUri}/versions/${versionNumber}/export`,
 {
+            headers,
+            observe: 'response',
+            responseType: 'text'
+        });
+    }
+
+    getDropletSnapshotMetadata(dropletUri: string): Observable<any> {

Review Comment:
   I can manually type out all of these response interfaces in this PR, but we 
use `Observable<any>` for a lot of http response types in NiFi. I think if we 
want to have stronger typing for our API responses it would be much better to 
leverage a package that generates Typescript interfaces from backend schemas. 
Not only would it save us a ton of time doing manual work but we also get the 
big advantage of ensuring the contract between the frontend and the backend 
isn't broken at build time.



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