Support async V4 payload signing

[dagnir]

Motivation and Context

This commit adds support for SigV4 signing of async request payloads.

In addition this commit moves the support for trailing checksums from HttpChecksumStage to the V4 signer implementation; this puts it in line with how sync chunked bodies are already handled.

This fills a gap in our signing logic where payloads that would normally be signed are not.

Modifications

• Remove trailing checksum path for SRA signed requests in HttpChecksumStage; trailing checksums taken care of in AwsChunkedV4PayloadSigner, same as for sync payloads
• Support payload signing and trailers for async requests in AwsChunkedV4PayloadSigner
• Internal refactor of AwschunkedV4PayloadSigner to reduce code duplication

Testing

• New unit tests
• Enable previously disabled tests that were not passing
• Ran integ tests

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed
• I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new file created by the script in .changes/next-release with your changes.
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

[dagnir]

FYI this is because we use the default chunk size in DefaultAwsV4HttpSigner now, which is 128 KiB, so the 37KiB payload fits in a single chunk:

aws-sdk-java-v2/core/http-auth-aws/src/main/java/software/amazon/awssdk/http/auth/aws/internal/signer/DefaultAwsV4HttpSigner.java

Line 53 in 43f262c

private static final int DEFAULT_CHUNK_SIZE_IN_BYTES = 128 * 1024;

[dagnir]

Fallback to body content signing now works for async requests

[alextwoods]

Is there a performance regression risk for customers that have been using http to avoid tls overhead?

[dagnir]

Is there a performance regression risk for customers that have been using http to avoid tls overhead?

Yes, this is probably true, but this is a functionality gap rather than a feature, so I think this is okay. I don't have concrete numbers, but I will start some long running tests to see.