Packaging + provenance for the plugin marketplace. No runtime behavior change
yet - verification is available on demand; enforcing it at plugin load/migrate
and pulling from a shelf are Phase 2.
- signing.py: ed25519 key pairs + provenance. Provenance is a sorted per-file
SHA-256 map plus metadata; the detached signature covers the exact
serialized provenance bytes, so verifying is re-hash files, re-serialize,
check signature. verify() accepts any of several trusted keys (rotation).
Uses cryptography (already a dependency).
- packaging.py: pack() builds a signed <name>-<version>.shopdbplugin (zip +
PROVENANCE.json + PROVENANCE.sig). verify_artifact()/verify_dir() re-hash
and check the signature, and flag a tampered file, an unexpected file, a
wrong/absent key - all fail closed.
- CLI: `flask plugin keygen` (publisher key pair), `flask plugin pack <name>
--key` (validates then signs), and `flask plugin validate` extended to a
signed artifact by path (--pubkey, else PLUGIN_TRUSTED_KEYS).
- config PLUGIN_TRUSTED_KEYS: os.pathsep-separated public-key PEM paths,
delivered with the site config, never read from the shelf. .env.example
documents it.
- docs/PLUGIN-SIGNING.md: curator flow (keygen offline, review, pack, publish,
pin keys, rotate).
The signature proves an artifact is exactly what a curator signed, not that the
code is safe - human review before signing is the control. 11 tests: sign/verify
round trip, wrong key, provenance excludes noise, serialize determinism, pack +
verify, tamper -> hash mismatch, extra file, no-key fail-closed, verify_dir.
1028 pass, naming green.
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