unkinben e7027c8ccc feat: cache upstream bearer tokens (#92) ...

Fixes #77

## Why
Each upstream 401 re-ran the full token-endpoint request, even though a single Docker pull triggers many blob/manifest requests sharing one scope.

## Changes
- Add Redis `GetToken`/`SetToken`.
- `fetchBearerToken` now also parses `expires_in` and returns a TTL.
- New `Engine.cachedBearerToken` reuses a cached token keyed by remote + challenge (hashed), caching for `expires_in` minus a safety margin (default 60s when absent).

## Validation
- `make e2e` passes.

Reviewed-on: #92
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>

2026-07-02 21:35:46 +10:00

..

redis.go

feat: cache upstream bearer tokens (#92)

2026-07-02 21:35:46 +10:00