Stop the OIDC subsystem from writing credential-grade secrets into logs and returned errors.
- crates/iam/src/oidc.rs: redact sensitive header values (authorization, proxy-authorization, cookie, set-cookie) in format_http_headers, emitting only name and length; drop the raw request/response body from the DEBUG events (keep byte length); stop logging and stop splicing the raw token response body into the error returned on token_response_parse_failed (the TokenResponseBodyShape summary and length are retained); remove the now-unused format_http_body helper.
- rustfs/src/admin/handlers/oidc.rs: stop logging the raw authorization code and state on the code-exchange error path (code_len/state_len are kept).
This is the OIDC log/error redaction pre-work (batch 0B) from the OIDC review in rustfs/backlog#1437. It changes diagnostic content only; HTTP/STS status codes and legitimate request results are unchanged.
Zhengchao An
1c8088d0b2