Tighten correctness, security and observability of the tenant RBAC
foundation introduced in 3c4cdd70 in response to internal review.
Bugfixes
- custom_agents.runnable_by_viewer: drop the GORM `default:true` tag.
GORM treats a plain bool's zero value as "unspecified" and silently
rewrites it to the column default on insert, which would prevent
admins from ever creating an agent with viewer-runtime disabled. The
column-level DEFAULT TRUE on the database side still backstops rows
inserted by raw SQL / migrations.
- TenantMemberRepository.HasAnyMembers: replace `Limit(1).Count(&n)`
with `Take(&probe)`. GORM's Count ignores Limit and scans the whole
table, which matters because this runs on the auth middleware's
hot path for users without a cached membership.
- service/user.LoginWithOIDC: include User, Tenant and Memberships in
the OIDCCallbackResponse so the OIDC flow returns the same shape as
password login (previously User and friends were left nil).
Security
- middleware/auth.resolveTenantRole: restrict orphan-tenant
auto-promotion to the caller's home tenant. Cross-tenant superuser
visits and JWTs minted for foreign tenants no longer trigger silent
Owner grants. Two regression tests pin the new behaviour.
- service/user.synthFallbackMembership: default the synthesised role
to Viewer instead of Owner. The login response only feeds UI; the
backend re-derives the real role from tenant_members on every
request, so showing a Viewer UI is preferable to a misleading Owner
UI that would surface admin controls the backend will then 403.
- migrations/versioned/000043_tenant_rbac.down.sql: gate the destructive
drop behind a `weknora.allow_destructive_migration` GUC so an
accidental `migrate down` cannot wipe role data in production.
- frontend/src/stores/auth.ts: comment currentTenantRole as
rendering-only so future PRs cannot mistake the localStorage-backed
value for an authorisation signal.
API contract
- Memberships in LoginResponse and OIDCCallbackResponse now serialises
without omitempty, and buildMembershipsForUser / synthFallbackMembership
always return a non-nil slice — frontend can rely on JSON `[]`.
- handler/auth.GetCurrentUser includes memberships so /auth/me refreshes
recover currentTenantRole after a page reload.
Performance
- Add TenantService.GetTenantsByIDs (with the matching repo method) and
use it inside buildMembershipsForUser to batch tenant-name lookups
instead of issuing one query per membership.
Observability
- Replace the remaining `log.Printf` calls in middleware/auth with
contextual logger.Warnf / logger.Infof so role resolution events ride
the standard request-id / Langfuse trace plumbing. The successful
auto-promote line is tagged `[audit]` for log mining.
Tests
- internal/application/service/tenant_member_test.go: hand-rolled
fakeTenantMemberRepo plus 11 cases covering AddMember validation,
EnsureOwner idempotence, "cannot demote/remove the last Owner",
same-role no-op, ErrInvalidTenantRole / ErrMembershipNotFound, and
the TenantRole.HasPermission lattice.
- internal/middleware/auth_role_test.go: fakeMemberService plus 8 cases
pinning every branch of resolveTenantRole, including the two H1
regressions (cross-tenant superuser must not auto-promote; orphan
auto-promote requires the home tenant).
wizardchen
f3d1210577