chromium_build_stats: redirect login url if not logged in.

appengine/chromium_build_stats/default/auth.go

Index: appengine/chromium_build_stats/default/auth.go
diff --git a/appengine/chromium_build_stats/default/auth.go b/appengine/chromium_build_stats/default/auth.go
new file mode 100644
index 0000000000000000000000000000000000000000..d1e71c5fdf461df48c908fe9f03f1b45da787a8b
--- /dev/null
+++ b/appengine/chromium_build_stats/default/auth.go
@@ -0,0 +1,38 @@
+package chromiumbuildstats
+
+import (
+	"html/template"
+	"net/http"
+
+	"appengine"
+	"appengine/user"
+)
+
+func authPage(w http.ResponseWriter, req *http.Request, status int, tmpl *template.Template, u *user.User, reqpath string) {
+	ctx := appengine.NewContext(req)
+	login, err := user.LoginURL(ctx, reqpath)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	logout, err := user.LogoutURL(ctx, reqpath)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "text/html")
+	w.WriteHeader(status)
+	data := struct {
+		User   *user.User
+		Login  string
+		Logout string
+	}{
+		User:   u,
+		Login:  login,
+		Logout: logout,
+	}
+	err = tmpl.Execute(w, data)
+	if err != nil {
+		ctx.Errorf("tmpl: %v", err)
+	}
+}