亚马逊S3和放大器;校验 [英] Amazon S3 & Checksum

问题描述

我试图验证是否已上传到水桶文件的完整性，但我不觉得这任何信息。

I try to verify the integrity of a file that was uploaded to a bucket but I don't find any information of this.

在该文件的标题，有一个电子标签，但我认为它不是一个MD5校验。

In the file's headers, there is a "E-tag" but I think its not a md5 checksum.

所以，我怎么可以检查，如果我上传到Amazon S3的文件是一样的，我有我的电脑上？

So, how can I check if the file that I uploaded on Amazon S3 is the same that I have on my computer ?

感谢。 ：）

推荐答案

如果您正在使用REST API上传的对象（高达5GB）在一个单一的操作，那么您可以添加内容-MD5 < /在 PUT 请求STRONG>头。根据该S3的文档PUT，内容-MD5标头是：

If you are using the REST API to upload an object (up to 5GB) in a single operation, then you can add the Content-MD5 header in your PUT request. According the the S3 documentation for PUT, the Content-MD5 header is:

在的base64 EN codeD 128位的MD5 根据RFC 1864年这个头可以被用作一个消息完整性检查消化消息（无头）来验证数据是最初发送相同的数据。虽然是可选的，我们建议使用Content-MD5机制作为一个终端到终端的完整性检查。

The base64 encoded 128-bit MD5 digest of the message (without the headers) according to RFC 1864. This header can be used as a message integrity check to verify that the data is the same data that was originally sent. Although it is optional, we recommend using the Content-MD5 mechanism as an end-to-end integrity check.

检查这个答案如何计算一个base64连接codeD 128位的MD5摘要。如果您使用的是 s3curl ，则可以包括计算消化使用您的请求头 - contentMd5 选项。

Check this answer on how to compute a base64 encoded 128-bit MD5 digest. If you are using s3curl, you can include the computed digest in your request headers using the --contentMd5 option.

如果MD5摘要上传完成后计算的亚马逊不匹配您在Content-MD5头提供的MD5摘要，亚马逊将响应一个 BadDigest 错误code

If the md5 digest computed by Amazon upon upload completion does not match the md5 digest you provided in the Content-MD5 header, Amazon will respond with a BadDigest error code.

如果您使用的是多部分上传，内容-MD5头用作完整性检查每个单独的组成部分。一旦多部分上载被最终确定，亚马逊目前不提供一种方法来验证组装文件的完整性。

If you are using multipart upload, the Content-MD5 header serves as an integrity check for each part individually. Once the multipart upload is finalized, Amazon does not currently provide a way to verify the integrity of the assembled file.

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