# Deployment + Service — Keycloak (namespace: sso)
#
# Prerequisites (apply in order):
#   1. pvc.yaml          — keycloak-data PVC
#   2. middleware.yaml   — Traefik middlewares
#   3. create-secrets.sh — keycloak-config Secret (KC_DB_URL, KC_DB_PASSWORD,
#                          KC_BOOTSTRAP_ADMIN_PASSWORD)
#   4. Edit PROVIDER_JAR_URL in the init container below (CP-NK-005 — see CONFIG.md)
#   5. This file
#
# After first pod starts successfully:
#   6. bootstrap-realm.sh — configure master realm, create net-kingdom realm
#
# privacyIDEA Keycloak Provider (init container):
#   The init container downloads the provider JAR to /opt/keycloak/providers/
#   before Keycloak starts. Keycloak detects providers and rebuilds automatically
#   (no --optimized flag). Build output is cached in the keycloak-data PVC so
#   subsequent restarts skip the full rebuild.
#
#   For production, prefer building a custom image with the provider pre-baked:
#     FROM quay.io/keycloak/keycloak:VERSION
#     COPY keycloak-provider-VERSION.jar /opt/keycloak/providers/
#     RUN /opt/keycloak/bin/kc.sh build
#   A custom image avoids the internet dependency and ensures a reproducible build.
#   See README.md "Custom image" section for details.
#
# Container ports:
#   8080 — HTTP (Traefik ingress; TLS terminated at Traefik)
#   9000 — Management (health/live, health/ready, health/started — kubelet only)

apiVersion: apps/v1
kind: Deployment
metadata:
  name: keycloak
  namespace: sso
  labels:
    app.kubernetes.io/name: keycloak
    app.kubernetes.io/part-of: net-kingdom-sso-mfa
    net-kingdom/component: sso
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: keycloak
  strategy:
    type: Recreate   # single replica — avoid two pods racing on the build-cache PVC
  template:
    metadata:
      labels:
        app.kubernetes.io/name: keycloak
        app.kubernetes.io/part-of: net-kingdom-sso-mfa
        net-kingdom/component: sso
    spec:
      securityContext:
        runAsNonRoot: true
        runAsUser: 1000      # keycloak user inside the official image
        fsGroup: 1000

      # ── Init: download privacyIDEA Keycloak Provider JAR ─────────────────
      # The JAR is placed in /opt/keycloak/providers/ via an emptyDir volume.
      # Keycloak detects the new provider on startup and rebuilds automatically.
      #
      # NOTE: This requires outbound HTTPS from the cluster to GitHub.
      # If your cluster has no egress internet access, pre-stage the JAR in an
      # internal registry or use a custom Keycloak image (see comment above).
      initContainers:
        - name: install-privacyidea-provider
          # Pin curl image version alongside the Keycloak image.
          image: curlimages/curl:8.10.1
          securityContext:
            runAsNonRoot: true
            runAsUser: 65534   # nobody — curl image default
          env:
            - name: PROVIDER_JAR_URL
              # CP-NK-005 — EDIT this value before applying.
              # Find the correct release at:
              #   https://github.com/privacyIDEA/keycloak-provider/releases
              # Choose a version compatible with your Keycloak image version above.
              # Example:
              #   https://github.com/privacyIDEA/keycloak-provider/releases/download/v0.9/keycloak-provider-0.9.jar
              value: "EDIT_BEFORE_APPLY"
          command:
            - sh
            - -c
            - |
              if [ "$PROVIDER_JAR_URL" = "EDIT_BEFORE_APPLY" ]; then
                echo "ERROR: PROVIDER_JAR_URL not set." >&2
                echo "Edit deployment.yaml and replace PROVIDER_JAR_URL with the real JAR URL." >&2
                echo "See CONFIG.md CP-NK-005 and README.md." >&2
                exit 1
              fi
              echo "Downloading privacyIDEA Keycloak Provider from: $PROVIDER_JAR_URL"
              curl -fsSL -o /providers/keycloak-provider.jar "$PROVIDER_JAR_URL"
              BYTES=$(wc -c < /providers/keycloak-provider.jar)
              echo "Downloaded: ${BYTES} bytes -> /providers/keycloak-provider.jar"
          volumeMounts:
            - name: providers
              mountPath: /providers

      containers:
        - name: keycloak
          # Pin to a specific release; update via image update policy.
          # Check https://quay.io/repository/keycloak/keycloak for latest stable.
          image: quay.io/keycloak/keycloak:26.0
          imagePullPolicy: IfNotPresent

          # kc.sh start — no --optimized flag so Keycloak rebuilds when providers change.
          # After the first successful start, subsequent starts use the cached build
          # in the keycloak-data PVC and restart within ~30 seconds.
          args: ["start"]

          ports:
            - name: http
              containerPort: 8080
              protocol: TCP
            - name: management
              containerPort: 9000
              protocol: TCP

          # ── Environment — sensitive values from Secret ──────────────────
          env:
            # Database
            - name: KC_DB
              value: postgres
            - name: KC_DB_URL
              valueFrom:
                secretKeyRef:
                  name: keycloak-config
                  key: KC_DB_URL
            - name: KC_DB_USERNAME
              value: keycloak
            - name: KC_DB_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: keycloak-config
                  key: KC_DB_PASSWORD

            # Bootstrap admin (used only on first start to create the admin user)
            - name: KC_BOOTSTRAP_ADMIN_USERNAME
              value: admin
            - name: KC_BOOTSTRAP_ADMIN_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: keycloak-config
                  key: KC_BOOTSTRAP_ADMIN_PASSWORD

            # Hostname & proxy
            # CP-NK-004 — update CONFIG.md if you change this value.
            - name: KC_HOSTNAME
              value: kc.coulomb.social
            # Traefik passes X-Forwarded-For and X-Forwarded-Proto headers.
            - name: KC_PROXY_HEADERS
              value: xforwarded
            # TLS is terminated at Traefik; Keycloak serves HTTP inside the cluster.
            - name: KC_HTTP_ENABLED
              value: "true"

            # Observability
            - name: KC_HEALTH_ENABLED
              value: "true"
            - name: KC_METRICS_ENABLED
              value: "true"
            - name: KC_LOG_LEVEL
              value: INFO

            # Caching — local = in-JVM Infinispan; switch to ispn for multi-replica HA.
            - name: KC_CACHE
              value: local

          # ── Volume mounts ───────────────────────────────────────────────
          volumeMounts:
            # providers emptyDir: populated by init container before Keycloak starts
            - name: providers
              mountPath: /opt/keycloak/providers
              readOnly: true
            # data PVC: Keycloak build cache (data/generated/) and runtime data
            - name: data
              mountPath: /opt/keycloak/data

          # ── Probes ──────────────────────────────────────────────────────
          # Keycloak 24+: health endpoints on management port 9000.
          # /health/started — true once the application has completed startup.
          # /health/live    — true unless the application is in an unrecoverable state.
          # /health/ready   — true once Keycloak can serve requests.
          #
          # Startup: allow up to 5 min for DB migrations + provider build on first boot.
          startupProbe:
            httpGet:
              path: /health/started
              port: 9000
            initialDelaySeconds: 20
            periodSeconds: 10
            failureThreshold: 30   # 30 × 10s = 5 min
          livenessProbe:
            httpGet:
              path: /health/live
              port: 9000
            initialDelaySeconds: 0
            periodSeconds: 15
            failureThreshold: 3
          readinessProbe:
            httpGet:
              path: /health/ready
              port: 9000
            initialDelaySeconds: 0
            periodSeconds: 10
            failureThreshold: 3

          # ── Resources ───────────────────────────────────────────────────
          # Keycloak is JVM-based; the initial provider build spikes CPU briefly.
          # Raise limits for production.
          resources:
            requests:
              cpu: "250m"
              memory: "512Mi"
            limits:
              cpu: "1000m"
              memory: "1Gi"

      # ── Volumes ─────────────────────────────────────────────────────────
      volumes:
        # providers emptyDir: re-populated by init container on every pod start.
        # Keycloak detects the JAR and checks whether a rebuild is needed.
        # If the JAR hash matches the cached build, startup is fast (~30s).
        - name: providers
          emptyDir: {}
        - name: data
          persistentVolumeClaim:
            claimName: keycloak-data

---
# Service — ClusterIP; Traefik reaches Keycloak via port 8080.
# Port 9000 (management) is NOT exposed — kubelet probes reach it directly on the pod.
apiVersion: v1
kind: Service
metadata:
  name: keycloak
  namespace: sso
  labels:
    app.kubernetes.io/name: keycloak
    app.kubernetes.io/part-of: net-kingdom-sso-mfa
    net-kingdom/component: sso
spec:
  type: ClusterIP
  selector:
    app.kubernetes.io/name: keycloak
  ports:
    - name: http
      port: 8080
      targetPort: 8080
      protocol: TCP