Testing a simple CAS authentication

test_cas_client.go

package main

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

	"log"
	"strings"

	"github.com/Unknwon/macaron"
	"github.com/macaron-contrib/session"
)

func main() {
	server_root := "https://cas.ens-lyon.fr/cas"
	local_login_url := "http://localhost:4000/login"

	m := macaron.Classic()
	m.Use(macaron.Renderer())
	m.Use(session.Sessioner())

	m.Get("/login", func(ctx *macaron.Context, s session.Store) {
		ticket := ctx.Query("ticket")
		if len(ticket) == 0 {
			ctx.Redirect(server_root + "/login?service=" + local_login_url)
			return
		} else {
			s.Set("ticket", ticket)
			ctx.Redirect("/")
		}
	})

	m.Get("/", func(ctx *macaron.Context, s session.Store) string {
		if s.Get("login") != nil {
			return "Welcome, " + s.Get("login").(string)
		}

		// Retrieve the ticket
		if s.Get("ticket") == nil {
			ctx.Redirect("/login")
			return ""
		}

		// Validate the ticket
		ticket := s.Get("ticket").(string)
		resp, err := http.Get(server_root + "/validate?ticket=" + ticket + "&service=" + local_login_url)

		if err != nil {
			log.Fatalf("ERROR: %s\n", err)
			return "Unable to validate the ticket"
		}

		bs, _ := ioutil.ReadAll(resp.Body)
		split := strings.Split(string(bs), "\n")
		ticketValid, login := split[0] == "yes", split[1]

		if ticketValid {
			s.Set("login", login)
			ctx.Redirect("/")
			return ""
		}

		return "Invalid login"
	})

	m.Run()
}