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agatha cd89ba5dea Feat: Proxy image content through the API instead of redirecting to MinIO

Replace the presigned-URL redirect (302) in GET /api/v1/images/{id}/file
with a direct proxy that fetches bytes from S3 server-side and returns them
to the client. The browser never contacts the storage backend, eliminating
the /etc/hosts workaround needed in local development.

- StorageBackend: swap get_presigned_url for get(key) -> bytes
- S3StorageBackend: implement get() via aiobotocore get_object
- serve_image_file: return Response with ETag + Cache-Control: immutable
- test_serving: assert 200 + content-type + ETag; add no-storage-details test
- Spec Kit artifacts for feature 002-api-image-proxy

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-03 16:36:43 +00:00

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Data Model: API Image Proxy

Branch: 002-api-image-proxy | Date: 2026-05-03

Summary

This feature introduces no new entities and no database schema changes.

The change is entirely in the retrieval path for image file content:

The Image entity's storage_key field is used as the S3 object key to fetch content from storage.
The mime_type field is used to set the Content-Type response header.
The hash field (SHA-256) is used to set the ETag response header.

All three fields are already present on the Image entity per the existing data model in specs/001-reaction-image-board/plan.md.

StorageBackend interface change

The StorageBackend abstract interface (api/app/storage/backend.py) gains one method and loses one:

Method	Change	Notes
`get_presigned_url(key, expires_in_seconds)`	Removed	No callers remain after this feature
`get(key: str) -> bytes`	Added	Returns full object content as bytes

This is an interface change, not a data model change. The database schema is unaffected.

1.1 KiB Raw Permalink Blame History

Data Model: API Image Proxy

Summary

StorageBackend interface change

1.1 KiB

Raw Permalink Blame History