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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_RENDERER_HOST_BACK_FORWARD_CACHE_SUBFRAME_NAVIGATION_THROTTLE_H_
#define CONTENT_BROWSER_RENDERER_HOST_BACK_FORWARD_CACHE_SUBFRAME_NAVIGATION_THROTTLE_H_
#include "content/public/browser/navigation_throttle.h"
#include "content/public/browser/web_contents_observer.h"
namespace content {
// BackForwardCacheSubframeNavigationThrottle defers subframe navigation before
// commit when the page that the subframe is in is BFCached. For now, this is
// only for WillCommitWithoutUrlLoader and WillStartRequest since currently, we
// allow no-URLLoader navigations that haven't yet reached the "pending commit"
// stage and navigations that use URLLoader that haven't sent network requests.
// We disallow any navigations in all other stages when the frame is in
// BFCache. This throttle resumes the deferred navigation when a page which
// contains the subframe is restored from the BFCache. Find more details in
// https://crbug.com/1511153.
class BackForwardCacheSubframeNavigationThrottle : public NavigationThrottle,
public WebContentsObserver {
public:
~BackForwardCacheSubframeNavigationThrottle() override;
CONTENT_EXPORT static void MaybeCreateAndAdd(
NavigationThrottleRegistry& registry);
private:
explicit BackForwardCacheSubframeNavigationThrottle(
NavigationThrottleRegistry& registry);
// NavigationThrottle
const char* GetNameForLogging() override;
ThrottleCheckResult WillStartRequest() override;
ThrottleCheckResult WillRedirectRequest() override;
ThrottleCheckResult WillFailRequest() override;
ThrottleCheckResult WillProcessResponse() override;
ThrottleCheckResult WillCommitWithoutUrlLoader() override;
// WebContentsObserver
void RenderFrameHostStateChanged(
RenderFrameHost* render_frame_host,
RenderFrameHost::LifecycleState old_state,
RenderFrameHost::LifecycleState new_state) override;
// Defer subframe navigation which hasn't reached "pending commit" stage nor
// sent a network request if the frame is in BackForwardCache.
NavigationThrottle::ThrottleCheckResult DeferNavigationIfNeeded();
// Check that navigations that need URLLoader in bfcached page don't hit the
// stages after sending network requests.
void ConfirmNavigationIsNotInBFCachedFrame();
bool is_deferred_ = false;
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_BACK_FORWARD_CACHE_SUBFRAME_NAVIGATION_THROTTLE_H_
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