OAuth2 for GA in Go

gistfile1.go

func AccountConnectHandler(w http.ResponseWriter, r *http.Request) {
    // TODO: Check state? r.FormValue("state")

	transport := &oauth.Transport{
		Config: &config,
		Transport: &urlfetch.Transport{
			Context: appengine.NewContext(r),
		},
	}

	token, err := transport.Exchange(r.FormValue("code"))
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	log.Println("Exchanged token:", token)

	client := transport.Client()

	oauthApi, err := oauth2.New(client)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	tokenInfo, err := oauthApi.Userinfo.Get().Do()
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	log.Println("Email detected:", tokenInfo.Email)

	analyticsApi, err := analytics.New(client)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	result, err := analyticsApi.Management.Accounts.List().Do()
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	fmt.Fprint(w, result.Kind)
}