更新 AWS S3 过期时间 [英] Updating AWS S3 expiration time

问题描述

我想知道如何延长密钥的到期时间.我指的不是访问对象的签名 URL，而是密钥本身.

I would like to know how to EXTEND a key's expiration. I am not referring to the signed URL that accesses the object but the key itself.

我为 AWS 设置了一条规则，即存储桶中的所有对象都应在 90 天内过期.这就是我希望在大多数情况下发生的事情.有时，我需要将单个密钥的生命周期再延长 90 天.事实上，重置倒计时很好.

I setup AWS to have a rule that all objects within the bucket should expire in 90 days. This is what I want to happen in most cases. Now and then I need to extend an individual key's lifetime by up to an additional 90 days. In fact resetting the countdown is fine.

我已经使用 AWS 开发工具包进行了尝试，但无济于事.

I have tried this using the AWS SDK to no avail.

我的第一次尝试是使用 copyObject 更改元数据:

My First attempt was to alter metadata using copyObject:

ObjectMetadata meta = s3client.getObjectMetadata( bucket, key );
meta.setExpirationTime( getFutureDate( 90*DAYS ) );
CopyObjectRequest copyObjectRequest = new CopyObjectRequest( bucket, key, bucket, key );
copyObjectRequest.setNewObjectMetadata( meta );
copyObjectRequest.setStorageClass( StorageClass.Standard );
s3client.copyObject( copyObjectRequest );

以上方法无效.JavaDoc 甚至告诉我原因(尝试后阅读).

The above did not work. The JavaDoc even clued me in as to why (read it after attempting).

void com.amazonaws.services.s3.model.ObjectMetadata.setExpirationTime(Date expirationTime)

For internal use only. This will *not* set the object's expiration time, and is only used to set the value in the object after receiving the value in a response from S3.

然后我尝试了基于此链接的上述变体(添加了 setStorageClass):https://alestic.com/2013/09/s3-lifecycle-extend/

I then tried a variation on the above based on this link (added setStorageClass): https://alestic.com/2013/09/s3-lifecycle-extend/

感谢任何帮助.

推荐答案

我确实有正确的答案.下面的 Python 代码可能会执行将 BUCKET/KEY 复制到自身上的相同技巧，并且还会重置到期时间.AWS S3 基于 24 小时时钟将到期时间向上舍入到同一时间，因此在同一天完成的任何复制都不会引起注意.我让密钥在 90 天刷新后放置一周左右以进行测试，看起来上次修改时间"+ ExpirationRuleDays =到期日期"确实成立.

I indeed have the right answer. The below Python code likely does the same trick of copying the BUCKET/KEY onto itself and would also reset the expiration. AWS S3 rounds up the expiry time to the same time based on a 24hr clock so any copying done on the same day is not something that will be noticed. I let keys sit for a week or so on a 90 day refresh to do testing and it does seem like the "Last Modified" + ExpirationRuleDays = "Expiry Date" holds.

我创建了两个密钥，在运行以下代码后，我从 S3 管理控制台获得了以下信息.

I have two keys created and after running the below code I got the following form the S3 Management Console.

旧 - 1

Last Modified:  Thu Jun 04 15:48:58 GMT-700 2015
Expiry Date:    Wed Sep 02 17:00:00 GMT-700 2015
Expiration Rule:    Auto-Expire after 90 days

新 - 1

Last Modified:  Mon Jun 08 15:37:01 GMT-700 2015
Expiry Date:    Sun Sep 06 17:00:00 GMT-700 2015
Expiration Rule:    Auto-Expire after 90 days

旧 - 2

Last Modified:  Thu Jun 04 13:34:36 GMT-700 2015
Expiry Date:    Wed Sep 02 17:00:00 GMT-700 2015
Expiration Rule:    Auto-Expire after 90 days

新 - 2

Last Modified:  Mon Jun 08 15:41:19 GMT-700 2015
Expiry Date:    Sun Sep 06 17:00:00 GMT-700 2015
Expiration Rule:    Auto-Expire after 90 days

代码:

public void refreshURLTTL( String messageId ) {
    AmazonS3 s3client = new AmazonS3Client(new ProfileCredentialsProvider(configFileName, profileName));

    ObjectMetadata meta = s3client.getObjectMetadata(BUCKETNAME, KEY);
    ObjectMetadata newmeta = meta.clone();
    Date oldExpiration = meta.getExpirationTime();

    CopyObjectRequest copyObjectRequest = new CopyObjectRequest(BUCKETNAME, KEY, BUCKETNAME, KEY);
    copyObjectRequest.setNewObjectMetadata(newmeta);

    s3client.copyObject(copyObjectRequest);     

    ObjectMetadata finalmeta = s3client.getObjectMetadata(BUCKETNAME, KEY);
    Date currentExpiration = finalmeta.getExpirationTime();

    System.out.println("OLD: "+oldExpiration);
    System.out.println("NEW: "+currentExpiration);
}

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