Appengine 图片服务 URL，deleteServingUrl 问题

Question

我在上传到 Google 云存储的图像文件上创建一个 imageServing url 使用：

String key = "/gs/<bucket-name>/<path>";
ImagesService imagesService = ImagesServiceFactory.getImagesService();
ServingUrlOptions options = ServingUrlOptions.Builder
                .withGoogleStorageFileName(key)
                .imageSize(900) // Optional.
                .crop(true); // Optional.
String servingUrl = imagesService.getServingUrl(options);

但是好像没有办法删除这个url。可用方法 "deleteServingUrl" 接受我不使用的 blobKey。

这是否意味着我不需要删除 servingUrl？

///////EDIT

将 Appengine 与对象化结合使用。创建了一个 servlet，UserImageEndpoint 在 web.xml 中将其定义为：

<servlet>
    <servlet-name>UserImageEndpoint</servlet-name>
    <servlet-class>reach.backend.Servlets.UserImageEndpoint</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>UserImageEndpoint</servlet-name>
    <url-pattern>/userImageEndpoint</url-pattern>
</servlet-mapping>

Servlet class :

public class UserImageEndpoint extends HttpServlet {

private static final Logger logger = Logger.getLogger(UserImageEndpoint.class.getName());
private static final String BUCKET_NAME_IMAGE = "xxxx-yyyy";


@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    //
    //
    //
    GcsFilename gcsFilename = new GcsFilename(BUCKET_NAME_IMAGE, actualImageId);
    GcsService gcsService = GcsServiceFactory.createGcsService();
    //this works, I get the meta-data, hence I am able to access
    logger.info(gcsService.getMetadata(gcsFilename).toString());
    BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
    BlobKey blobKey = blobstoreService.createGsBlobKey(
                        "/gs/" + gcsFilename.getBucketName() + "/" + gcsFilename.getObjectName());
    logger.info("Requesting fileName - " + blobKey.getKeyString());
    servingURL = ImagesServiceFactory.getImagesService().getServingUrl(
                        ServingUrlOptions.Builder.withBlobKey(blobKey));

最后一行崩溃：

java.lang.IllegalArgumentException: ACCESS_DENIED: at com.google.appengine.api.images.ImagesServiceImpl.getServingUrl(ImagesServiceImpl.java:282)

//////EDIT Ling no. 282 seems to be the method deleteServingUrl(BlobKey blobKey), which I am not even calling right now...

Answer 1

正如@konqi 指出的那样，文档中的重要部分指出，如果文件已经public仅通过云存储可用（cloud.google.com/appengine/docs/java/images)

我遇到了完全相同的问题，但通过在尝试使用 Blobstore API 创建服务 url 之前不在云存储中将 ACL 设置为 public 解决了这个问题。

Appengine 图片服务 URL，deleteServingUrl 问题

Appengine Image serving URL, deleteServingUrl issue

java

google-app-engine

google-cloud-storage