infrastructure/modules/cluster-components/gateway.tf

resource "kubernetes_secret" "digitalocean-token" {
  metadata {
    name      = "digitalocean-token"
    namespace = kubernetes_namespace.tjo-cloud.metadata[0].name
  }
  data = {
    token = var.digitalocean_token
  }
}

resource "kubernetes_manifest" "tjo-cloud-issuer" {
  manifest = {
    apiVersion = "cert-manager.io/v1"
    kind       = "Issuer"
    metadata = {
      name      = "tjo-cloud"
      namespace = kubernetes_namespace.tjo-cloud.metadata[0].name
    }
    spec = {
      acme = {
        email  = "tine@tjo.space"
        server = "https://acme-staging-v02.api.letsencrypt.org/directory"
        privateKeySecretRef = {
          name = "tjo-cloud-acme-account"
        }
        solvers = [
          {
            dns01 = {
              digitalocean = {
                tokenSecretRef = {
                  name = kubernetes_secret.digitalocean-token.metadata[0].name
                  key  = "token"
                }
              }
            }
          }
        ]
      }
    }
  }
}

resource "kubernetes_manifest" "gateway_class_config" {
  manifest = {
    apiVersion = "gateway.envoyproxy.io/v1alpha1"
    kind       = "EnvoyProxy"
    metadata = {
      name      = "daemonset"
      namespace = kubernetes_namespace.tjo-cloud.metadata[0].name
    }
    spec = {
      provider = {
        type = "Kubernetes"
        kubernetes = {
          envoyDaemonSet = {
            patch = {
              type = "StrategicMerge"
              value = {
                spec = {
                  template = {
                    spec = {
                      hostNetwork = true
                      dnsPolicy   = "ClusterFirstWithHostNet"
                    }
                  }
                }
              }
            }
            pod = {
              nodeSelector = {
                "node-role.kubernetes.io/control-plane" = ""
              }
              tolerations = [
                {
                  key    = "node-role.kubernetes.io/control-plane"
                  effect = "NoSchedule"
                }
              ]
            }
          }
        }
      }
    }
  }
}

resource "kubernetes_manifest" "gateway_class" {
  manifest = {
    apiVersion = "gateway.networking.k8s.io/v1"
    kind       = "GatewayClass"
    metadata = {
      name = "envoy"
    }
    spec = {
      controllerName = "gateway.envoyproxy.io/gatewayclass-controller"
      parametersRef = {
        group     = "gateway.envoyproxy.io"
        kind      = "EnvoyProxy"
        name      = kubernetes_manifest.gateway_class_config.object.metadata.name
        namespace = kubernetes_manifest.gateway_class_config.object.metadata.namespace
      }
    }
  }
}

resource "kubernetes_manifest" "gateway" {
  manifest = {
    apiVersion = "gateway.networking.k8s.io/v1"
    kind       = "Gateway"
    metadata = {
      name      = "gateway"
      namespace = kubernetes_namespace.tjo-cloud.metadata[0].name
      annotations = {
        "cert-manager.io/issuer" = "tjo-cloud"
      }
    }
    spec = {
      gatewayClassName = kubernetes_manifest.gateway_class.object.metadata.name
      listeners = [
        {
          name     = "http"
          hostname = "*.${var.cluster_name}.${var.cluster_domain}"
          protocol = "HTTPS"
          port     = 443
          allowedRoutes = {
            namespaces = {
              from = "Same"
            }
          }
          tls = {
            mode = "Terminate"
            certificateRefs = [
              {
                name = "tjo-cloud-tls"
              }
            ]
          }
        }
      ]
    }
  }
}