amazon s3 - AWS java SDK manually set signature version

Question

I'm trying to access a blob store service which is on top of AWS S3. It supports AWS SDK and it's signature version 2.

I'm using code here to access the this service.

Is it possible to manually set the signature version of the request made by AWS SDK ?

According to this page

AWS currently supports two signature versions: signature version 2 and signature version 4, which are covered in this section. Most services support version 4, and if a service supports version 4, we strongly recommend that you use that version.

I'm unable to find how to set the signature version to 2 or 4 manually.

Answer 1

From the S3 Developer Guide - Specifying Signature Version in Request Authentication:

Java SDK

Add the following in your code.

System.setProperty(SDKGlobalConfiguration.ENABLE_S3_SIGV4_SYSTEM_PROPERTY, "true");

Or, on the command line, specify the following.

-Dcom.amazonaws.services.s3.enableV4

It looks like v2 was the default in the AWS SDK previously, but v4 is now the default starting in SDK v1.11.0 (May, 2016).