michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "js/TypeDecls.h"
michael@0: #include "nsGlobalWindow.h"
michael@0: #include "nsIPrincipal.h"
michael@0: #include "nsIURI.h"
michael@0: #include "nsString.h"
michael@0: #include "xpcpublic.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: struct FeedWriterEnabled {
michael@0:   static bool IsEnabled(JSContext* cx, JSObject* aGlobal)
michael@0:   {
michael@0:     // Make sure the global is a window
michael@0:     nsGlobalWindow* win = xpc::WindowGlobalOrNull(aGlobal);
michael@0:     if (!win) {
michael@0:       return false;
michael@0:     }
michael@0: 
michael@0:     // Make sure that the principal is about:feeds.
michael@0:     nsCOMPtr<nsIPrincipal> principal = win->GetPrincipal();
michael@0:     NS_ENSURE_TRUE(principal, false);
michael@0:     nsCOMPtr<nsIURI> uri;
michael@0:     principal->GetURI(getter_AddRefs(uri));
michael@0:     if (!uri) {
michael@0:       return false;
michael@0:     }
michael@0: 
michael@0:     // First check the scheme to avoid getting long specs in the common case.
michael@0:     bool isAbout = false;
michael@0:     uri->SchemeIs("about", &isAbout);
michael@0:     if (!isAbout) {
michael@0:       return false;
michael@0:     }
michael@0: 
michael@0:     // Now check the spec itself
michael@0:     nsAutoCString spec;
michael@0:     uri->GetSpec(spec);
michael@0:     return spec.Equals("about:feeds");
michael@0:   }
michael@0: };
michael@0: 
michael@0: }