Google Cloud Storage + App Engine签名的网址上传处理程序 [英] Google Cloud Storage + App Engine signed url upload handler

问题描述

有什么方法可以在带有Google App Engine（Java）的Google云端存储中使用已签名的URL创建处理程序？

我可以在我的Android（Java）应用程序中将文件成功上传到具有签名URL的存储区中，但是在上载完成后，我没有当前的方式来执行附加代码服务器端。

我一直在讨论Blobstore API，并创建了由应用引擎中的servlet处理的上传url，但似乎无法使其在我的内部工作Cloud Endpoints App Engine项目。

另外，签名的url对我来说似乎很有利，因为我可以设置它们的到期时间。

解决方案

看起来目前唯一的方法是使用对象更改通知。其实并没有那么糟糕。

我在Cloud Endpoints App Engine项目中设置了一个servlet，并在它的 doPost（）我在请求的json主体中读取并解析它，获得所需的全部信息： https://cloud.google.com/storage/docs/object-change-notification#_Type_AddUpdateDel

保留请注意文档中的警告：

由于上述重试机制，有可能多次传送
通知。确保您的
应用程序对于处理一个唯一的
通知是幂等的。

您发送通知后采取的是幂等的（例如，多次操作不会影响操作的第一个结果）

Is there any way to create a handler with signed urls in Google Cloud Storage with Google App Engine (Java)?

I can successfully upload files to buckets with signed URLs in my Android (Java) app but I have no current way of executing additional code server-side upon upload completion.

I have been messing around with the Blobstore API and by creating upload urls that are handled by a servlet in app engine but I can't seem to make it work inside my Cloud Endpoints App Engine project.

Also, signed urls seem favorable to me because I can set expiration times on them.

解决方案

Looks like the only way to do this right now is with object change notifications. Which actually isn't that bad.

I set up a servlet in my Cloud Endpoints App Engine project and in it's doPost() I read in the json body of the request, and parsing it you get all the information you need: https://cloud.google.com/storage/docs/object-change-notification#_Type_AddUpdateDel

Keep in mind this warning from the docs though:

Because of the retry mechanism above, it is possible that notifications are delivered more than once. Ensure that your application is idempotent with respect to processing a unique notification.

So make sure whatever operations you are taking after a notification is sent is idempotent (e.g. doing the operation more than once does not affect the first result of the operation)

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