Authenticated request to a Google Cloud Function in Go.

main.go

package main

import (
	"context"
	"io/ioutil"
	"net/http"

	"github.com/kr/pretty"
	"google.golang.org/api/idtoken"
	"google.golang.org/api/option"
)

func main() {
	saKey := "/Users/pete/Downloads/some-key.json"
	url := "https://path-to-cf"

	client, err := idtoken.NewClient(context.TODO(), url, option.WithCredentialsFile(saKey))
	if err != nil {
		panic(err)
	}

	req, err := http.NewRequest(http.MethodPost, url, nil)
	if err != nil {
		panic(err)
	}

	res, err := client.Do(req)
	if err != nil {
		panic(err)
	}

	// Do stuff with the response.
	bodyBytes, err := ioutil.ReadAll(res.Body)
	if err != nil {
		panic(err)
	}
	pretty.Logln(string(bodyBytes))
}