Firebase: Failed to validate MAC - go

Question

I am using fireauth and firego from zabawaba99. I am getting an error (please see below) when pushing data to my firebase database. I have been following his examples but I cannot get it to work. Someone got a idea why this is happening?
Error:
2016/06/03 14:30:13 {
"error" : "Failed to validate MAC."
}
Code:
gen := fireauth.New("<API-KEY/SECRET>")
data := fireauth.Data{"uid": "1"}
token, err := gen.CreateToken(data, nil)
if err != nil {
log.Fatal(err)
}
fb := firego.New("https://myapp.firebaseio.com" , nil)
log.Println(token)
fb.Auth(token)
for i := 0; i<len(items); i++ {
item := items[i]
pushedItem, err := fb.Child("items").Push(items)
if err != nil {
log.Fatal(err) // error is happening here
}
var itemTest string
if err := pushedItem.Value(&itemTest); err != nil {
log.Fatal(err)
}
fmt.Printf("%s: %s\n", pusedItem, itemTest)
}

Answer 1

Unfortunately there isn't Go-specific documentation, but I believe, based on the new docs, that the old REST way to authenticate doesn't work any longer.
Having said that, I have been able to get your code to work reading a bunch of docs, lots of trial & error, and by using OAuth authentication by means of JWT.
Firstly, follow this guide: https://firebase.google.com/docs/server/setup but just the "Add Firebase to your App" section.
Issue a go get -u golang.org/x/oauth2 and go get -u golang.org/x/oauth2/google (or use your favorite vendoring way).
Change your code as such:
package main
import (
"fmt"
"io/ioutil"
"log"
"github.com/zabawaba99/firego"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
)
func main() {
jsonKey, err := ioutil.ReadFile("./key.json") // or path to whatever name you downloaded the JWT to
if err != nil {
log.Fatal(err)
}
conf, err := google.JWTConfigFromJSON(jsonKey, "https://www.googleapis.com/auth/userinfo.email",
"https://www.googleapis.com/auth/firebase.database")
if err != nil {
log.Fatal(err)
}
client := conf.Client(oauth2.NoContext)
fb := firego.New("https://myapp.firebaseio.com" , client)
for i := 0; i<len(items); i++ {
item := items[i]
pushedItem, err := fb.Child("items").Push(items)
if err != nil {
log.Fatal(err) // error is happening here
}
var itemTest string
if err := pushedItem.Value(&itemTest); err != nil {
log.Fatal(err)
}
fmt.Printf("%s: %s\n", pusedItem, itemTest)
}
}
The above worked for me!
Edit: Adding reference to StackOverflow answers that helped me:
Using Custom Tokens to make REST requests to FB DB as an admin
Is it still possible to do server side verification of tokens in Firebase 3?