英文:
Limit upload size for appengine interface to cloud store
问题
考虑一个将图像（头像）上传到Google Cloud Storage的功能，该功能将从用户的Web浏览器开始，然后通过一个Go appengine实例，该实例将处理标准的压缩/裁剪等操作，然后将生成的图像设置为Cloud Storage中的对象。
如何确保appengine实例不会被过多或错误的数据超载？换句话说，我认为我在问两个问题（或者可能不是两个问题）：
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如何限制在单个请求中允许发送到appengine实例的数据量，或者是否已经有一个默认的安全限制？
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如何验证数据，以确保它是正确的jpg/png/gif格式，然后再尝试使用标准的Go图像库进行处理？
英文:
Consider an image (avatar) uploader to Google Cloud Storage which will start from the user's web browser, and then pass through a Go appengine instance which will handle standard compression/cropping etc. and then set the resulting image as an object in Cloud Storage
How can I ensure that the appengine instance isn't overloaded by too much or bad data? In other words, I think I'm asking two questions (or possibly not):
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How can I limit the amount of data allowed to be sent to an appengine instance in a single request, or is there already a default safe limit?
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How can I validate the data to make sure it's proper jpg/png/gif before attempting to process it with standard go image libraries?
答案1
得分: 0
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所有的App Engine请求都限制在32MB以内。
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在上传开始之前，你可以检查要上传的文件的大小。
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你可以验证文件的MIME类型，只允许正确的文件被上传。
英文:
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All App Engine requests are limited to 32MB.
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You can check the size of the file being uploaded before the upload starts.
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You can verify the file's mime-type and only allow correct files to be uploaded.
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