Amazon S3的截止日期？ [英] Amazon S3 Expiration Date?

问题描述

我希望这个问题不是太简陋，但我很困惑......

在S3文档我读：

  

所有的HTTP查询有失效   参数，允许您设置   长查询将是有效的。对于   例如，您可以配置一个网页   图形以经过很长的到期   一段时间或一个软件下载   只有持续24小时。

有关可公开访问的数据对象（文件），这是否意味着数据对象（文件）本身将不再有效，或者说，浏览器将重新缓存在到期日之后的对象。正如，我将失去十年后我的数据，如果我那么久设置我的到期？或者，如果我设置了下载24小时后，被它不见了/人迹罕至的过去呢？

如果我没有设定一个期限？

解决方案

我相信你指的是存储在Amazon S3上的私人数据签名的网址。

如果文件是公众可访问它们可以用简单的URL到文件被访问：

例如 http://s3.amazonaws.com/ [斗] / [关键]

然而，它们可以被设置为<一个href="http://docs.amazonwebservices.com/AmazonS3/latest/dev/index.html?UsingAuthAccess.html">private在这种情况下，你需要提供一个签署网址访问该文件。使用此URL创建了公开和秘密密钥，它的这个网址，有一个到期时间。例如：

<$p$p><$c$c>http://[bucket].s3.amazonaws.com/[key]?AWSAccessKeyId=[AWS_Public_Key]&Expires=1294766482&Signature=[generated_hash]

根据您的问题，为Web图形，您可以重复使用同一个生成的URL与定远到未来的到期时间，使浏览器可以缓存文件，而文件下载你可能会创建一个新的URL与URL集的每个请求到期只提前一天来保护您的数据。

本不到期/删除/删除存储在S3上的数据。它仅影响的URL文件，并根据您的需要不同的到期日期，您可以产生尽可能多的网址。

I hope this question isn't too rudimentary, but I'm confused...

In the S3 documentation I read:

All HTTP queries have an expiration parameter that allows you to set how long the query will be valid. For example, you can configure a web page graphic to expire after a very long period of time or a software download to only last for 24 hours.

For a publicly accessible data object (file), does this mean that the data object (file) itself will not be valid anymore, or that the browser will simply re-cache the object after the expiration date. As in, will I lose my data after ten years if I set my expirations that long? Or if I set a download for 24 hours, is it gone/inaccessible past that?

What if I don't set an expiration date?

解决方案

I believe you are referring to the signed urls for private data stored on Amazon S3.

If files are publicly accessible they can be accessed with a simple url to the file:

eg http://s3.amazonaws.com/[bucket]/[key]

However, they can be set to private in which case you need to provide a signed url to access the file. This url is created using your public and secret keys, and its this url that has an expiry time. eg

http://[bucket].s3.amazonaws.com/[key]?AWSAccessKeyId=[AWS_Public_Key]&Expires=1294766482&Signature=[generated_hash]

As per your question, for web graphics, you might re-use the same generated url with the expiry time set far into the future so that browsers can cache the file, whereas for file downloads you'd probably create a new url for each request with the url set to expire only a day in advance to protect your data.

This DOES NOT expire/delete/remove your data stored on S3. It only affects the url to the file and you can generate as many urls with different expiry dates as you require.

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