third_party/blink/renderer/modules/service_worker/navigator_service_worker.cc

// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/renderer/modules/service_worker/navigator_service_worker.h"

#include "services/network/public/mojom/web_sandbox_flags.mojom-blink.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/frame/navigator.h"
#include "third_party/blink/renderer/modules/service_worker/service_worker_container.h"
#include "third_party/blink/renderer/platform/bindings/script_state.h"
#include "third_party/blink/renderer/platform/instrumentation/use_counter.h"

namespace blink {

ServiceWorkerContainer* NavigatorServiceWorker::From(LocalDOMWindow& window) {
  if (!window.GetSecurityOrigin()->CanAccessServiceWorkers())
    return nullptr;
  return ServiceWorkerContainer::From(window);
}

// static
ServiceWorkerContainer* NavigatorServiceWorker::serviceWorker(
    ScriptState* script_state,
    Navigator&,
    ExceptionState& exception_state) {
  LocalDOMWindow& window = *LocalDOMWindow::From(script_state);
  auto* container = From(window);
  if (!container) {
    String error_message;
    if (window.IsSandboxed(network::mojom::blink::WebSandboxFlags::kOrigin)) {
      error_message =
          "Service worker is disabled because the context is sandboxed and "
          "lacks the 'allow-same-origin' flag.";
    } else {
      error_message =
          "Access to service workers is denied in this document origin.";
    }
    exception_state.ThrowSecurityError(error_message);
    return nullptr;
  }

  if (window.GetSecurityOrigin()->IsLocal())
    UseCounter::Count(window, WebFeature::kFileAccessedServiceWorker);

  return container;
}

}  // namespace blink