appengine/go UserService

app.yaml

application: goxembourg
version: 1
runtime: go
api_version: go1

handlers:
- url: /v1.*
  script: _go_app

to.go

package togo

import (
  "net/http"
	"fmt"
	"encoding/json"

	"appengine"
	"appengine/user"
)

type Auth struct {
	LoginUrl string
	LogoutUrl string
	LoggedIn bool
}

type Json interface {
	toJson()
}

func (auth Auth) toJson() (ret string) {
	b, err := json.Marshal(auth)
	if err != nil {
		return "{}"
	}
	return string(b)
}

func init() {
	http.HandleFunc("/", handler)
	http.HandleFunc("/v1/auth", authHandler)
}

func handler(rw http.ResponseWriter, req *http.Request) {
	fmt.Fprintf(rw, "Hello, Go")
}

func authHandler(rw http.ResponseWriter, req *http.Request) {
	c := appengine.NewContext(req)
	u := user.Current(c)
	var auth Auth
	auth.LoginUrl, _ = user.LoginURL(c, "/")
	auth.LogoutUrl, _ = user.LogoutURL(c, "/")
	if u == nil {
		auth.LoggedIn = false
	} else {
		auth.LoggedIn = true
	}

	rw.Header().Set("Content-Type", "application/json")
	fmt.Fprintf(rw, "%s", auth.toJson())
}