porter/api/server/handlers/cluster/list_namespaces.go

package cluster

import (
	"net/http"

	"github.com/porter-dev/porter/api/server/authz"
	"github.com/porter-dev/porter/api/server/handlers"
	"github.com/porter-dev/porter/api/server/shared"
	"github.com/porter-dev/porter/api/server/shared/apierrors"
	"github.com/porter-dev/porter/api/types"
	"github.com/porter-dev/porter/internal/models"
)

type ListNamespacesHandler struct {
	handlers.PorterHandlerWriter
	authz.KubernetesAgentGetter
}

func NewListNamespacesHandler(
	config *shared.Config,
	writer shared.ResultWriter,
) *ListNamespacesHandler {
	return &ListNamespacesHandler{
		PorterHandlerWriter:   handlers.NewDefaultPorterHandler(config, nil, writer),
		KubernetesAgentGetter: authz.NewOutOfClusterAgentGetter(config),
	}
}

func (c *ListNamespacesHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	cluster, _ := r.Context().Value(types.ClusterScope).(*models.Cluster)

	agent, err := c.GetAgent(r, cluster)

	if err != nil {
		c.HandleAPIError(w, apierrors.NewErrInternal(err))
		return
	}

	namespaceList, err := agent.ListNamespaces()

	if err != nil {
		c.HandleAPIError(w, apierrors.NewErrInternal(err))
		return
	}

	res := types.ListNamespacesResponse{
		NamespaceList: namespaceList,
	}

	c.WriteResult(w, res)
}