Cannot get attributes for object

[ben-dale]

👋 I suspect this feature might not be implemented, but wanted to raise here, in case I'm missing something!

https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObjectAttributes.html

I tried to retrieve object attributes manually using S3mock and the documentation above, but this was unsuccessful. Making this GET request returns the object contents, instead of the attributes:

GET http://s3mock:60317/objectkey?attributes

The error I receive when using the AWS SDK:

val request = GetObjectAttributesRequest
            .builder()
            .bucket(bucket)
            .key(key)
            .objectAttributes(ObjectAttributes.OBJECT_SIZE)
            .build()

val result = s3AsyncClient.getObjectAttributes(request).await()

Could not parse XML response.
software.amazon.awssdk.core.exception.SdkClientException: Could not parse XML response.
	at app//software.amazon.awssdk.core.exception.SdkClientException$BuilderImpl.build(SdkClientException.java:102)
	at app//software.amazon.awssdk.core.exception.SdkClientException.create(SdkClientException.java:47)
	at app//software.amazon.awssdk.protocols.query.unmarshall.XmlDomParser.parse(XmlDomParser.java:59)

Thanks!

[afranken]

Correct, this is currently not implemented.
Looks like it's not complicated, though, I'll add this API for the next release. :)

[afranken]

ah - looked at the documentation again - I can add some of the implementation.

GetObjectAttributes combines the functionality of GetObjectAcl, GetObjectLegalHold, GetObjectLockConfiguration, GetObjectRetention, GetObjectTagging, HeadObject, and ListParts

GetObjectAcl, GetObjectLegalHold, GetObjectLockConfiguration, GetObjectRetention functionality currently does not exist in the S3Mock, so this can't be added.

GetObjectTagging, HeadObject, and ListParts functionality exists, so I could add that.

Not sure if partial responses work - I'll check.
This may take a while to fully complete. :(

[afranken]

this can be implemented once LegalHold, ACL, ObjectLock and ObjectRetention are implemented.
See #213, #157, #290

[afranken]

implemented GetObjectLegalHold, GetObjectLockConfiguration and GetObjectRetention for #157, ACLs are next.

[afranken]

@ben-dale how and why do you use this API?

The implementation for the "HeadObject" attributes is straightforward, but I struggle to understand how the "ListParts" attributes are supposed to work.

I can't get a test case against the S3 API to work.
There is no way to pass in an "uploadId", so a call to an object where the multipart upload is still running returns a 404 key not found.
After the multipart upload is completed, the "parts" in the response are empty because there are no more parts.

[bpoland]

@ben-dale how and why do you use this API?

The implementation for the "HeadObject" attributes is straightforward, but I struggle to understand how the "ListParts" attributes are supposed to work.

I can't get a test case against the S3 API to work. There is no way to pass in an "uploadId", so a call to an object where the multipart upload is still running returns a 404 key not found. After the multipart upload is completed, the "parts" in the response are empty because there are no more parts.

If it helps, we are only using getObjectAttributes instead of headObject because the latter is not supported in the AWS java SDK 1.x that we're still using. So if getObjectAttributes partially worked by only including the headObject attributes that would be enough for us :)

[afranken]

@ben-dale / @bpoland
Just released 2.16.0 that supports getObjectAttributes for objects. :)