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6aac785841 #217: map IdP groups and roles onto the permission model
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Declarative instance setting idpMapping.rules turns ID-token claims into
pond roles and the site-admin flag on every OIDC login — configuration,
not code. Mapped grants travel through the SAME GrantsService path as
manual ones (permission cache invalidated, collab access notify fires so
live sessions revalidate — asserted by test), never raw rows.

Ownership makes precedence explicit: role_grants.origin marks mapped
rows, users.is_site_admin_managed marks a mapping-set admin flag. The
mapping only creates and revokes what it owns — manual wins: hand-made
grants and hand-promoted admins are never revoked by a missing claim (a
manual toggle clears the marker and takes ownership). Removal of a claim
revokes the mapped grant and the managed flag on the next login. Every
mapping-driven change is audited with origin idp_mapping.

Failure containment: unknown pond slugs and the last-Pond-Admin
protection log-and-skip — a mapping problem must never become a login
lockout. Tests drive real OIDC logins against the fake IdP with group
claims: grant + working access, revocation incl. notify, manual-wins,
managed site-admin promote/demote/hands-off.

Documented in permissions.md (own section), ADR 0021, data-model.md and
the hardening guide (care rule: same PR).

Refs #217.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AUtYMxwTCMHG9mVHnwbFg8
2026-07-31 13:09:11 +02:00