apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: trading-platform-netpol
  namespace: customer1
spec:
  podSelector:
    matchExpressions:
      - key: app
        operator: In
        values:
          - trading-data-service
          - trading-execute-service
          - trading-news-service
          - trading-dashboard
  policyTypes:
    - Ingress
    - Egress
  ingress:
    # Allow from Gateway / ingress controller
    - from:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: customer1
      ports:
        - port: 3000
          protocol: TCP
        - port: 8000
          protocol: TCP
        - port: 8001
          protocol: TCP
        - port: 8002
          protocol: TCP
        - port: 8003
          protocol: TCP
    # Allow from Tailscale proxy namespace
    - from:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: tailscale
      ports:
        - port: 3000
          protocol: TCP
        - port: 8000
          protocol: TCP
        - port: 8001
          protocol: TCP
        - port: 8002
          protocol: TCP
        - port: 8003
          protocol: TCP
    # Allow inter-service communication
    - from:
        - podSelector:
            matchExpressions:
              - key: app
                operator: In
                values:
                  - trading-data-service
                  - trading-execute-service
                  - trading-news-service
                  - trading-dashboard
      ports:
        - port: 3000
          protocol: TCP
        - port: 8000
          protocol: TCP
        - port: 8001
          protocol: TCP
        - port: 8002
          protocol: TCP
        - port: 8003
          protocol: TCP
  egress:
    # Allow DNS
    - to:
        - namespaceSelector: {}
          podSelector:
            matchLabels:
              k8s-app: kube-dns
      ports:
        - port: 53
          protocol: UDP
        - port: 53
          protocol: TCP
    # Allow DB access
    - to:
        - podSelector:
            matchLabels:
              cnpg.io/cluster: hermes-pgdb
      ports:
        - port: 5432
          protocol: TCP
    # Allow Redis access
    - to:
        - podSelector:
            matchLabels:
              app: trading-redis
      ports:
        - port: 6379
          protocol: TCP
    # Allow Kafka access
    - to:
        - podSelector:
            matchLabels:
              app: trading-kafka
      ports:
        - port: 9092
          protocol: TCP
    # Allow inter-service egress
    - to:
        - podSelector:
            matchExpressions:
              - key: app
                operator: In
                values:
                  - trading-data-service
                  - trading-execute-service
                  - trading-news-service
                  - trading-dashboard
      ports:
        - port: 8000
          protocol: TCP
        - port: 8001
          protocol: TCP
        - port: 8002
          protocol: TCP
        - port: 8003
          protocol: TCP