Initial commit of RubyV2 test server

[seebees]

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[lucasmcdonald3]

Requesting Copilot review since I can't Ruby

[Copilot]

Pull Request Overview

This PR introduces an initial implementation of a Ruby V2 test server for S3 Encryption Client compatibility testing. The server provides a REST API wrapper around the AWS S3 Encryption Client v2 to enable cross-language compatibility testing alongside existing Java and Python implementations.

Key changes include:

• Complete Ruby server implementation with Sinatra-based REST API
• Client management system with caching for S3 encryption client instances
• Metadata serialization utilities and error handling to match Smithy model specifications
• Updated Java test cases to accommodate Ruby-specific error message variations

Reviewed Changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
test-server/ruby-v2-server/app.rb	Main Sinatra application implementing REST endpoints for client creation and S3 operations
test-server/ruby-v2-server/lib/client_manager.rb	Manages S3 encryption client instances with thread-safe caching
test-server/ruby-v2-server/lib/metadata_utils.rb	Utility class for metadata string/hash conversion matching Java/Python format
test-server/ruby-v2-server/lib/error_handlers.rb	Error response utilities matching Smithy model types
test-server/ruby-v2-server/lib/logger.rb	Centralized logging utility with structured request/response logging
test-server/ruby-v2-server/Gemfile	Ruby dependency specification
test-server/ruby-v2-server/config.ru	Rack configuration file
test-server/ruby-v2-server/README.md	Documentation for setup and usage
test-server/java-tests/src/it/java/software/amazon/encryption/s3/RoundTripTests.java	Updated test cases to handle Ruby-specific error messages

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[lucasmcdonald3]

Questions

[kessplas]

eventually we'll need RSA and AES keys as well but this is fine for now.

[kessplas]

only the comments about asserting Ruby when the message is the Ruby message are blocking

[ShubhamChaturvedi7]

LGTM. We might want to refactor out some of the repeated modules such as logger etc but it's a test server so not high priority.

[josecorella]

lgtm