ISP-split auth verifier seams for mgf-common consumers — a generic SessionVerifier + WebhookVerifier, a Clerk adapter (session-JWT + Svix-webhook), typed 401 errors, and mocks. Sibling of mgf-common under the mgf.* namespace.
Project description
mgf-auth
Two ISP-split auth verifier seams for mgf-common consumers — a
generic SessionVerifier + WebhookVerifier, a Clerk adapter
(session-JWT verification + Svix-webhook verification), typed 401 errors,
and test mocks. A sibling of mgf-common under the mgf.* namespace.
Extracted from PlasmaMapper after its core re-design ISP-split the auth
provider (ADR-016). A consumer keeps its own role-typed principal —
SessionVerifier is generic over the principal type; identity
resolution (Clerk ids → your principal) is your principal_resolver.
Install
pip install "mgf-auth[clerk]" # [clerk] adds pyjwt for the session adapter
Use
from mgf.auth.clerk_session import ClerkSessionVerifier, ClerkClaims
from mgf.auth.clerk_webhook import ClerkWebhookVerifier
async def resolve(claims: ClerkClaims) -> MyPrincipal:
return MyPrincipal(user_id=uuid5(NS, claims.sub), role=map_role(claims.org_role), ...)
session_verifier: ClerkSessionVerifier[MyPrincipal] = ClerkSessionVerifier(
jwt_public_key=PEM, issuer="https://clerk.acme.example", principal_resolver=resolve,
)
principal = await session_verifier.verify_session(bearer_token) # -> MyPrincipal
webhook_verifier = ClerkWebhookVerifier(webhook_secret=b"whsec_...")
event = await webhook_verifier.verify_webhook(headers, raw_body) # -> WebhookEvent
Tests use MockSessionVerifier[MyPrincipal]() (add_session) and
MockWebhookVerifier() (configure_webhook_secret + the sign()
helper) — no Clerk, no network.
What's in it
| Name | What |
|---|---|
SessionVerifier / WebhookVerifier |
the two @runtime_checkable seams (session is generic over P) |
WebhookEvent |
the verified-webhook DTO (event_type, event_id, payload, received_at) |
InvalidSessionError / InvalidWebhookSignatureError |
typed 401 errors (subclass mgf.common HttpUnauthorizedError) |
mgf.auth.clerk_session.ClerkSessionVerifier / ClerkClaims |
PyJWT session verification ([clerk] extra) |
mgf.auth.clerk_webhook.ClerkWebhookVerifier |
Svix-Signature HMAC webhook verification (stdlib) |
MockSessionVerifier / MockWebhookVerifier |
in-process test doubles |
Design
- Generic over the principal (
SessionVerifier[P]): the JWT mechanics live here; the consumer'sprincipal_resolverproduces its own principal shape — no imposed role/identity model. - Vendor SDK behind an extra: importing
mgf.authpulls nopyjwt(import-linter-enforced); the Clerk session adapter is the only place that needs it. - Webhook side is stdlib-only (HMAC-SHA256 over
<id>.<ts>.<body>). - Session revocation (checking a
revoked_sessionstable) is a consumer concern — it's DB-coupled and app-specific, so it stays in the consumer, not here.
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