chromium_build_stats: redirect login url if not logged in.

appengine/chromium_build_stats/default/auth.go

+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)
+        }
+}