list_workers.go

package main

import (
	"encoding/base64"
	"fmt"
	"net/http"
	"os"

	"github.com/concourse/go-concourse/concourse"
)

func main() {
	bat := BasicAuthTransport{
		username: os.Getenv("CONCOURSE_USERNAME"),
		password: os.Getenv("CONCOURSE_PASSWORD"),
	}

	client := concourse.NewClient(os.Getenv("CONCOURSE_URL"), &http.Client{Transport: bat}, false)

	workers, err := client.ListWorkers()
	if err != nil {
		fmt.Println(err)
	}
	fmt.Println(workers)
}

type BasicAuthTransport struct {
	username string
	password string
}

func (bat BasicAuthTransport) RoundTrip(req *http.Request) (*http.Response, error) {
	req.Header.Set("Authorization", fmt.Sprintf("Basic %s",
		base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%s:%s",
			bat.username, bat.password)))))
	fmt.Println("Doing request", req)
	return http.DefaultTransport.RoundTrip(req)
}