plusplusjiajia opened a new pull request, #2660:
URL: https://github.com/apache/iceberg-rust/pull/2660
## What
Adds AWS SigV4 request signing to the REST catalog client, for catalogs
that authenticate REST requests with SigV4.
## Approach
- `SigV4Signer` + a small `HttpRequestSigner` trait; the client signs each
request after token + `header.*` extras. Follows Iceberg Java's
`RESTSigV4AuthSession` (signs all headers minus a blacklist).
- `PayloadHashMode` handles the Iceberg detail: `x-amz-content-sha256` is
base64 for non-empty bodies (hex for empty); `StandardAws` keeps hex everywhere.
- Config: `rest.sigv4-enabled`,
`rest.signing-region`/`-name`/`-access-key-id`/`-secret-access-key`/`-session-token`
(falls back to `AWS_*` env), mutually
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