## What changed
Allow Unix workloads to acquire assertions directly from the SPIFFE Workload API for the existing OpenAI token exchange. Select this source with `OPENAI_IDENTITY_TOKEN_SOURCE=spiffe`, alongside `OPENAI_FEDERATION_RULE_ID`, `SPIFFE_ENDPOINT_SOCKET`, and `OPENAI_SPIFFE_AUDIENCE`. Optionally select an identity with `OPENAI_SPIFFE_ID`.
Fetch a JWT-SVID over a Unix socket for each exchange, reconnecting on refresh and bounding acquisition to ten seconds. Reject ambiguous responses and mismatched subject or audience claims, and retain only the gRPC status code from agent errors. Signature and lifetime verification remain the token endpoint's responsibility.
Keep file acquisition as the default, reject conflicting source settings, and exclude the new OpenAI-specific settings from model-launched environments. Document configuration and deployment constraints.
## Testing
Add local-socket tests for token exchange and refresh after agent restart, concurrent refreshes, JWT-SVIDs without key IDs, identity selection, error redaction, and timeouts. Add configuration tests for explicit source selection, invalid or conflicting settings, unsupported platforms, and session consistency.
GitOrigin-RevId: 9d88438ff41cd8f0b7356c512ec451455ed7c399
## What changed
- Add the `codex-workload-identity` crate for exchanging a file-backed JWT assertion and federation rule ID for short-lived ChatGPT credentials.
- Cache valid access tokens, refresh them before expiry or after rejection, and coalesce concurrent exchanges. Continue using a still-valid cached token when a proactive refresh fails transiently.
- Validate assertion files, token endpoints, and exchange responses; honor outbound proxy policy for HTTPS endpoints and redact access tokens from debug output.
## Testing
- Cover request encoding, assertion rotation, caching, concurrent refreshes, transient-failure fallback, configuration validation, and malformed inputs and responses.
GitOrigin-RevId: 5496851683c2dcf6aaad6840053b97f7c0be076e
cooper-oai