plusplusjiajia opened a new pull request, #616:
URL: https://github.com/apache/iceberg-cpp/pull/616
Implement AWS SigV4 authentication for the REST catalog client, following
Java's `RESTSigV4AuthManager` and `RESTSigV4AuthSession`.
- Extend `AuthSession::Authenticate()` with `HTTPRequestContext` (method,
url, body) for SigV4 request signing
- Add `SigV4AuthSession`: delegate-first auth → relocate conflicting
Authorization header → sign with AWS SDK
- Add `SigV4AuthManager`: wraps delegate AuthManager (default OAuth2),
resolves credentials from properties or default chain
- Body hash matches Java's `SignerChecksumParams` output: empty body → hex
`EMPTY_BODY_SHA256`; non-empty body → `Base64(SHA256(body))`
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