You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: commands.go
    path of file: ./repos/pipeline/src/api/cluster/pke
    
    the code of the file until where you have to start completion: // Copyright Â© 2018 Banzai Cloud
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package pke

import (
	"fmt"
	"net/http"

	"emperror.dev/errors"
	"github.com/gin-gonic/gin"

	"github.com/banzaicloud/pipeline/pkg/common"
)

// ListCommands Lists the commands for installing nodes in each nodePool
func (a *API) ListCommands(c *gin.Context) {
	cluster, ok := a.clusterGetter.GetClusterFromRequest(c)
	if !ok {
		err := errors.New("cluster not found")
		a.errorHandler.Handle(err)

		c.JSON(ht
    
func (a *API) ListCommands(c *gin.Context) {
	cluster, ok := a.clusterGetter.GetClusterFromRequest(c)
	if !ok {
		err := errors.New("cluster not found")
		a.errorHandler.Handle(err)

		c.JSON(http.StatusNotFound, common.ErrorResponse{
			Code:    http.StatusNotFound,
			Message: "Cluster not found",
			Error:   err.Error(),
		})
		return
	}
	clusterCommander, ok := cluster.(interface {
		GetBootstrapCommand(nodePool, url, token string) (string, error)
		GetPipelineToken(tokenGenerator interface{}) (string, error)
	})
	if !ok {
		err := errors.New(fmt.Sprintf("not implemented for this type of cluster (%T)", cluster))
		a.errorHandler.Handle(err)

		c.JSON(http.StatusNotFound, common.ErrorResponse{
			Code:    http.StatusNotFound,
			Message: "Not implemented",
			Error:   err.Error(),
		})
		return
	}

	commands := map[string]string{}

	var nodePools []string

	if cl, ok := cluster.(interface {
		ListNodePools() ([]string, error)
	}); ok {
		np, err := cl.ListNodePools()
		if err != nil {
			err := errors.WrapIf(err, "can't list nodes")
			a.errorHandler.Handle(err)

			c.JSON(http.StatusInternalServerError, common.ErrorResponse{
				Code:    http.StatusInternalServerError,
				Message: "internal error",
				Error:   err.Error(),
			})
			return
		}

		nodePools = np
	}

	token, err := clusterCommander.GetPipelineToken(a.tokenGenerator)
	if err != nil {
		err := errors.WrapIf(err, "can't generate token")
		a.errorHandler.Handle(err)

		c.JSON(http.StatusInternalServerError, common.ErrorResponse{
			Code:    http.StatusInternalServerError,
			Message: "internal error",
			Error:   err.Error(),
		})
		return
	}

	for _, nodePool := range nodePools {
		commands[nodePool], _ = clusterCommander.GetBootstrapCommand(nodePool, a.externalBaseURL, token)
	}

	if len(commands) == 0 { // give some examples for the user...
		commands["master"], _ = clusterCommander.GetBootstrapCommand("master", a.externalBaseURL, token)
		commands["pool1"], _ = clusterCommander.GetBootstrapCommand("pool1", a.externalBaseURL, token)
	}

	c.JSON(http.StatusOK, commands)
}