// Copyright 2019 Google LLC
//
// Licensed 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
//
//     https://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.

package com.google.sps.servlets;

import com.google.appengine.api.blobstore.BlobstoreService;
import com.google.appengine.api.blobstore.BlobstoreServiceFactory;
import java.io.IOException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/blobstore-upload-url")
public class BlobstoreUploadUrlServlet extends HttpServlet {

  private final BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();

  @Override
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
    String formActionUrl = blobstoreService.createUploadUrl("/my-image-servlet");
    response.setContentType("text/html");
    response.getWriter().println(formActionUrl);
  }
}

@@ -952,317 +952,747 @@
 e;%0A%0A
-@WebServlet(%22/blobstore-upload-url%22)%0Apublic class BlobstoreUploadUrlServlet extends HttpServlet %7B%0A%0A  private final BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();%0A%0A  @Override%0A  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException %7B
+/**%0A * Generates the destination (action) of the form for image uploading, by calling the Blobstore API.%0A *%0A * When the form is submitted, the user's browser uploads the file directly to the Blobstore %0A * via the generated URL. The Blobstore then passes the request to the %22/handle-photo%22 path. %0A * This handler does additional processing based on the blob key.%0A */%0A@WebServlet(%22/blobstore-upload-url%22)%0Apublic class BlobstoreUploadUrlServlet extends HttpServlet %7B%0A%0A  @Override%0A  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException %7B%0A    BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();%0A    %0A    // Create the URL that allows a user to upload a file to Blobstore.
 %0A   
@@ -1754,27 +1754,61 @@
 l(%22/
-my-image-servlet%22);
+handle-photo%22);%0A%0A    // Send the URL as the response.
 %0A   

Update BlobstoreUploadUrlServlet.java