# Example 2: Container Registry with Rotation + Reloader
#
# Use case: Docker registry with basic auth that rotates every 90 days
# 
# Characteristics:
# - Password rotates every 90 days
# - Registry doesn't need old password to accept new one
# - InitContainer regenerates htpasswd on pod restart
# - Reloader automatically restarts pod when secret changes
# - No keepPreviousVersion needed

---
apiVersion: v1
kind: Namespace
metadata:
  name: registry

---
# ManagedSecret generates and rotates registry credentials
apiVersion: secrets.c5ai.ch/v1alpha1
kind: ManagedSecret
metadata:
  name: registry-auth
  namespace: registry
spec:
  vault:
    address: "http://openbao.openbao.svc.cluster.local:8200"
    authMethod: kubernetes
    role: managedsecret-operator
    kvVersion: v2
    mount: secret
    path: registry/auth
  
  fields:
  - name: username
    type: static
    value: "admin"
  
  - name: password
    type: generated
    generator:
      type: password
      length: 32
      minDigits: 5
      minSymbols: 5
      minLowercase: 5
      minUppercase: 5
      symbolCharacters: "!@#$%^&*"
      allowRepeat: false
  
  destination:
    name: registry-credentials
    type: Opaque
    # No need for previous version - htpasswd is regenerated fresh
  
  rotation:
    enabled: true
    schedule: 2160h  # 90 days
    rotateGeneratedOnly: true  # Only rotate password, keep username

---
# PersistentVolumeClaim for registry storage
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: registry-pvc
  namespace: registry
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi
  storageClassName: longhorn

---
# Registry Deployment with Reloader integration
apiVersion: apps/v1
kind: Deployment
metadata:
  name: registry
  namespace: registry
  labels:
    app: registry
spec:
  replicas: 1
  selector:
    matchLabels:
      app: registry
  template:
    metadata:
      labels:
        app: registry
      annotations:
        # Reloader watches registry-credentials and restarts pod on change
        reloader.stakater.com/auto: "true"
    spec:
      securityContext:
        runAsNonRoot: true
        runAsUser: 65534
        fsGroup: 65534
        seccompProfile:
          type: RuntimeDefault
      
      initContainers:
      # Generate htpasswd file from current credentials at pod startup
      - name: generate-htpasswd
        image: httpd:2.4-alpine
        command:
        - sh
        - -c
        - |
          USERNAME=$(cat /credentials/username)
          PASSWORD=$(cat /credentials/password)
          htpasswd -Bbn "$USERNAME" "$PASSWORD" > /auth/htpasswd
          chmod 644 /auth/htpasswd
          echo "htpasswd generated with user: $USERNAME"
        volumeMounts:
        - name: credentials
          mountPath: /credentials
          readOnly: true
        - name: auth
          mountPath: /auth
        securityContext:
          allowPrivilegeEscalation: false
          runAsNonRoot: true
          runAsUser: 65534
          capabilities:
            drop:
            - ALL
      
      containers:
      - name: registry
        image: registry:2
        ports:
        - containerPort: 5000
          name: http
        env:
        - name: REGISTRY_STORAGE_DELETE_ENABLED
          value: "true"
        - name: REGISTRY_HTTP_ADDR
          value: "0.0.0.0:5000"
        # Enable HTTP basic auth
        - name: REGISTRY_AUTH
          value: "htpasswd"
        - name: REGISTRY_AUTH_HTPASSWD_REALM
          value: "Registry Realm"
        - name: REGISTRY_AUTH_HTPASSWD_PATH
          value: "/auth/htpasswd"
        securityContext:
          allowPrivilegeEscalation: false
          runAsNonRoot: true
          runAsUser: 65534
          capabilities:
            drop:
            - ALL
          seccompProfile:
            type: RuntimeDefault
        volumeMounts:
        - name: registry-storage
          mountPath: /var/lib/registry
        - name: auth
          mountPath: /auth
          readOnly: true
        livenessProbe:
          httpGet:
            path: /
            port: 5000
          initialDelaySeconds: 30
          periodSeconds: 10
        readinessProbe:
          httpGet:
            path: /
            port: 5000
          initialDelaySeconds: 5
          periodSeconds: 5
        resources:
          requests:
            cpu: 100m
            memory: 128Mi
          limits:
            cpu: 500m
            memory: 512Mi
      
      volumes:
      - name: registry-storage
        persistentVolumeClaim:
          claimName: registry-pvc
      - name: credentials
        secret:
          secretName: registry-credentials
      - name: auth
        emptyDir: {}

---
# Service for internal access
apiVersion: v1
kind: Service
metadata:
  name: registry
  namespace: registry
spec:
  type: ClusterIP
  selector:
    app: registry
  ports:
  - port: 5000
    targetPort: 5000
    protocol: TCP
    name: http

---
# Ingress for external access with TLS
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: registry
  namespace: registry
  annotations:
    cert-manager.io/cluster-issuer: letsencrypt-production
    nginx.ingress.kubernetes.io/proxy-body-size: "0"
    nginx.ingress.kubernetes.io/proxy-read-timeout: "600"
    nginx.ingress.kubernetes.io/proxy-send-timeout: "600"
    nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
    nginx.ingress.kubernetes.io/backend-protocol: "HTTP"
spec:
  ingressClassName: nginx
  tls:
  - hosts:
    - registry.c5ai.ch
    secretName: registry-ingress-tls
  rules:
  - host: registry.c5ai.ch
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: registry
            port:
              number: 5000

---
# How the rotation flow works:
#
# 1. After 90 days, ManagedSecret operator:
#    - Generates new password
#    - Updates Vault
#    - Updates registry-credentials Secret
#
# 2. Reloader detects Secret change:
#    - Sees resourceVersion changed
#    - Triggers rolling restart of registry Deployment
#
# 3. Pod restart with new credentials:
#    - InitContainer runs
#    - Reads NEW password from registry-credentials
#    - Generates fresh htpasswd file
#    - Registry container starts with new htpasswd
#
# 4. Result:
#    - Old clients with old password: FAIL (401 Unauthorized)
#    - New clients with new password: SUCCESS
#    - Downtime: ~1-2 minutes during rolling restart

---
# Testing commands:
#
# # Get current credentials
# kubectl get secret registry-credentials -n registry -o jsonpath='{.data.username}' | base64 -d
# kubectl get secret registry-credentials -n registry -o jsonpath='{.data.password}' | base64 -d
#
# # Test without auth (should fail)
# curl -i https://registry.c5ai.ch/v2/
#
# # Test with auth (should succeed)
# REGISTRY_USER=$(kubectl get secret registry-credentials -n registry -o jsonpath='{.data.username}' | base64 -d)
# REGISTRY_PASS=$(kubectl get secret registry-credentials -n registry -o jsonpath='{.data.password}' | base64 -d)
# curl -u $REGISTRY_USER:$REGISTRY_PASS https://registry.c5ai.ch/v2/_catalog
#
# # Docker login
# docker login registry.c5ai.ch -u $REGISTRY_USER -p $REGISTRY_PASS
#
# # Force rotation test
# kubectl annotate managedsecret registry-auth -n registry reconcile="$(date +%s)" --overwrite
# kubectl get pods -n registry -w  # Watch pod restart