locals {
  zonemta-labels = merge(local.common_labels, {
    "app.kubernetes.io/component" = "zonemta"
  })
}

resource "kubectl_manifest" "zonemta_deploy" {
  yaml_body  = <<-EOF
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: "${var.instance}-zonemta"
      namespace: "${var.namespace}"
      labels: ${jsonencode(local.zonemta-labels)}
    spec:
      replicas: 1
      selector:
        matchLabels: ${jsonencode(local.zonemta-labels)}
      template:
        metadata:
          labels: ${jsonencode(local.zonemta-labels)}
        spec:
          securityContext:
            fsGroup: 1000
          containers:
          - name: wildduck
            securityContext:
              capabilities:
                drop:
                - ALL
              readOnlyRootFilesystem: true
              runAsNonRoot: true
              runAsUser: 1000
            image: "${var.images.zonemta.registry}/${var.images.zonemta.repository}:${var.images.zonemta.tag}"
            imagePullPolicy: "${var.images.zonemta.pull_policy}"
            ports:
            - name: smtp
              containerPort: 5870
              protocol: TCP
            livenessProbe:
              tcpSocket:
                port: smtp
              initialDelaySeconds: 20
              periodSeconds: 30
            readinessProbe:
              tcpSocket:
                port: smtp
              initialDelaySeconds: 20
              periodSeconds: 30
            resources:
              {}
            volumeMounts:
            - name: tls
              mountPath: "/var/opt/certs"
              readOnly: true
            - name: config
              mountPath: /app/config/dbs-production.toml
              subPath: dbs-production.toml
            - name: config
              mountPath: /app/config/pools.toml
              subPath: pools.toml
            - name: config
              mountPath: /app/config/plugins/wildduck.toml
              subPath: wildduck.toml
            - name: config
              mountPath: /app/config/plugins/loop-breaker.toml
              subPath: loop-breaker.toml
            - name: config
              mountPath: /app/config/interfaces/feeder.toml
              subPath: feeder.toml
          volumes:
          - name: config
            configMap:
              name: "${var.instance}-zonemta"
          - name: tls
            secret:
              secretName: "${var.instance}-cert"
  EOF
}

resource "kubernetes_config_map_v1" "zonemta_config" {
  metadata {
    name = "${var.instance}-zonemta"
    namespace = "${var.namespace}"
    labels = local.zonemta-labels
  }
  data = yamldecode(<<-EOF
      feeder.toml: |-
        # Default SMTP interface for accepting mail for delivery
        [feeder]
        enabled=true
        # How many worker processes to spawn
        processes=1
        # Maximum allowed message size 30MB
        maxSize=31457280
        # Local IP and port to bind to
        host="0.0.0.0"
        port=5870
        # Set to true to require authentication
        # If authentication is enabled then you need to use a plugin with an authentication hook
        authentication=true
        # How many recipients to allow per message
        maxRecipients=1000
        # Set to true to enable STARTTLS. Do not forget to change default TLS keys
        starttls=true
        # set to true to start in TLS mode if using port 465
        # this probably does not work as TLS support with 465 in ZoneMTA is a bit buggy
        secure=false
        # define keys for STARTTLS/TLS. These paths are relative to CWD
        # NB! Keys must be accessible by process user or SMTP authentication will fail.
        key="/var/opt/certs/tls.key"
        cert="/var/opt/certs/tls.crt"
      dbs-production.toml: |-
        # Database configuration
        # this file is loaded when NODE_ENV=production
        # MongoDB connection string
        mongo="mongodb://${var.component}:${local.mongo-password}@${var.instance}-${var.component}-mongo-svc.${var.namespace}.svc:27017/${var.component}"
        # Redis connection string
        redis="redis://${var.instance}-${var.component}-redis.${var.namespace}.svc:6379/2"
        # Database name for ZoneMTA data in MongoDB. In most cases it should be the same as in the connection string
        sender="wildduck"
        # Database name for Wild Duck users
        # users="wildduck"
        # Database name for Wild Duck attachments
        # gridfs="wildduck"
      pools.toml: |-
        # List local IP addresses that can be used for outbound tcp connections
        # Server process must be able to locally bind to these addresses
        [[default]]
        address="0.0.0.0"
        name="${var.sub_domain}.${var.domain_name}"
        #
        #[[default]]
        #address="1.2.3.5"
        #name="ip-2.hostname"
      loop-breaker.toml: |-
        ["modules/zonemta-loop-breaker"]
        enabled="sender"
        secret="${local.secrets.zonemta}"
        algo="md5"
      wildduck.toml: |-
        ["modules/zonemta-wildduck"]
        enabled=["receiver", "sender"]
        # to which SMTP interfaces this plugin applies to. Use "*" for all interfaces
        interfaces=["feeder"]
        # optional hostname to be used in headers
        # defaults to os.hostname()
        hostname="${var.sub_domain}.${var.domain_name}"
        # How long to keep auth records in log
        authlogExpireDays=30
        # default smtp recipients for 24h (can be overriden per user)
        maxRecipients=2000
        disableUploads=false # if true then messages are not uploaded to Sent Mail folder
        uploadAll=false # if false then messages from Outlook are not uploaded to Sent Mail folder
        # SRS settings for forwarded emails
        # ---------------------------------
        ["modules/zonemta-wildduck".srs]
            # Handle rewriting of forwarded emails. If false then SRS is not used
            # Only affect messages that have interface set to "forwarder"
            enabled=true
            # SRS secret value. Must be the same as in the MX side
            secret="${local.secrets.srs}"
            # SRS domain, must resolve back to MX
            rewriteDomain="${var.domain_name}"
        # DKIM Settings
        # -------------
        ["modules/zonemta-wildduck".dkim]
            cipher="aes192"
            secret="${local.secrets.dkim}"
            useOpenSSL=true
            signTransportDomain=true
            hashAlgo="sha256"
  EOF
  )
}

resource "kubectl_manifest" "zonemta_service" {
  yaml_body  = <<-EOF
    apiVersion: v1
    kind: Service
    metadata:
      name: "${var.instance}-zonemta"
      namespace: "${var.namespace}"
      labels: ${jsonencode(local.zonemta-labels)}
    spec:
      type: LoadBalancer
      ports:
      - port: 587
        targetPort: smtp
        protocol: TCP
        name: smtp
      selector: ${jsonencode(local.zonemta-labels)}
  EOF
}