Keycloak Admin client setup for UserDisplayService Phase 2

KeycloakAdminUserResolver resolves a JWT sub against the Keycloak Admin REST API on cache miss, so users that never hit ordinis still get a display name in audit / reviews / changelog / events / history. Without this, only users who personally made an authenticated request show up with a real name (the "ток мой UUID отображается" pain).

This is a per-environment one-time setup. Disabled by default — flip on once the Keycloak client + vault secret exist.

Step 1: Create service-account client in Keycloak

Realm: nstart. Path: Clients → Create client.

Field	Value
Client type	OpenID Connect
Client ID	`ordinis-admin-client`
Client authentication	On (confidential)
Authorization	Off
Standard flow	Off
Direct access grants	Off
Service accounts roles	On

Save. On the created client → Service accounts roles tab → Assign role → Filter by clients → realm-management → check view-users → Assign.

(view-users is the minimum scope needed for GET /admin/realms/{realm}/users/{id}. Don't assign manage-users — read-only is enough.)

Then Credentials tab → copy the Client secret (long random string).

Step 2: Store secret in Vault

The cluster-domain matters here — staging is 265.local, prod is altum.local. Both have separate Vault instances.

Staging (cluster.265, namespace config):

kubectl -n config exec -it vault-0 -- sh -c '
  vault login <root-or-admin-token>
  vault kv put secret/ordinis/cuod/keycloak-admin \
    client_id=ordinis-admin-client \
    client_secret=<paste-from-keycloak>
'

Prod (altum, namespace vault):

ssh root@192.168.100.142 'kubectl -n vault exec -it vault-0 -- sh -c "
  vault login <prod-root-token>
  vault kv put secret/ordinis/cuod/keycloak-admin \
    client_id=ordinis-admin-client \
    client_secret=<paste-from-keycloak>
"'

⚠️ Different secret per environment — staging and prod have separate Keycloak clients (and certainly separate secrets).

Step 3: Wire into ordinis-app deployment

Add to ordinis-app helm chart annotations (vault agent injector template) — same pattern as secret-postgres / secret-kafka already present in the chart:

vault.hashicorp.com/agent-inject-secret-keycloak-admin: secret/data/ordinis/cuod/keycloak-admin
vault.hashicorp.com/agent-inject-template-keycloak-admin: |
  {{- with secret "secret/data/ordinis/cuod/keycloak-admin" -}}
  export ORDINIS_KEYCLOAK_ADMIN_CLIENT_ID="{{ .Data.data.client_id }}"
  export ORDINIS_KEYCLOAK_ADMIN_CLIENT_SECRET="{{ .Data.data.client_secret }}"
  {{- end }}

Add env vars to the deployment:

env:
  - name: ORDINIS_KEYCLOAK_ADMIN_ENABLED
    value: "true"
  - name: ORDINIS_KEYCLOAK_ADMIN_URL
    value: "https://altum.nstart.cloud/auth"   # both envs use the same Keycloak
  - name: ORDINIS_KEYCLOAK_ADMIN_REALM
    value: "nstart"
  # CLIENT_ID + CLIENT_SECRET arrive via the vault-injected
  # /vault/secrets/keycloak-admin file sourced before java starts.

Step 4: Verify

After redeploy, check the pod log on startup:

KeycloakAdminUserResolver active — base=https://altum.nstart.cloud/auth realm=nstart client=ordinis-admin-client

End-to-end:

# Find a sub that's NOT in the JVM cache (e.g. a user who never logged in).
# Hit the display endpoint as an admin user:
curl -s -H "Authorization: Bearer $TOKEN" \
  https://ordinis.k8s.265.nstart.cloud/api/v1/admin/users/<uuid>/display | jq
# Expect 200 with username/name/email even on cold cache, instead of 404.

Then check the DB — the row was persisted from the on-demand resolve:

SELECT sub, preferred_username, source, synced_at
  FROM user_display_cache
 WHERE sub = '<uuid>';
-- source = KEYCLOAK_ON_DEMAND

Step 5: Phase 3 (later — scheduled bulk sync)

When ready to refill the table proactively (avoids the per-user on-demand latency for fresh subs), add a Spring @Scheduled task that calls GET /admin/realms/{realm}/users paginated and writes via UserDisplayService.upsertFromKeycloak. Recommended every 6h. Not included in this MR — depends on observed cache miss rate.

Failure modes

Service-account client missing view-users → 403 on lookup, resolver throws RuntimeException, UserDisplayService logs warn, caller falls back to short UUID. No outage, just no resolve.
Keycloak unreachable → connect timeout / 502. Same fallback as above. Cached entries (DB tier) keep working.
client_secret rotated in Keycloak but vault not updated → 401 on token request → resolver wipes cached token and surfaces RuntimeException. Update vault secret and the next attempt succeeds.

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