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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/subframe_history_navigation_throttle.h"
#include "content/browser/renderer_host/frame_tree.h"
#include "content/browser/renderer_host/frame_tree_node.h"
#include "content/browser/renderer_host/navigation_request.h"
#include "content/browser/renderer_host/render_frame_host_impl.h"
#include "content/public/browser/navigation_handle.h"
namespace content {
SubframeHistoryNavigationThrottle::SubframeHistoryNavigationThrottle(
NavigationHandle* navigation_handle)
: NavigationThrottle(navigation_handle) {}
SubframeHistoryNavigationThrottle::~SubframeHistoryNavigationThrottle() =
default;
NavigationThrottle::ThrottleCheckResult
SubframeHistoryNavigationThrottle::WillStartRequest() {
// This will defer cross-document subframe history requests.
if (state_ == State::kRunningAfterResumeSignal) {
return PROCEED;
}
state_ = State::kDeferred;
return DEFER;
}
NavigationThrottle::ThrottleCheckResult
SubframeHistoryNavigationThrottle::WillCommitWithoutUrlLoader() {
// This will defer same-document subframe history commits.
if (state_ == State::kRunningAfterResumeSignal) {
return PROCEED;
}
state_ = State::kDeferred;
return DEFER;
}
const char* SubframeHistoryNavigationThrottle::GetNameForLogging() {
return "SubframeHistoryNavigationThrottle";
}
void SubframeHistoryNavigationThrottle::Resume() {
const bool should_resume = state_ == State::kDeferred;
state_ = State::kRunningAfterResumeSignal;
if (should_resume) {
NavigationThrottle::Resume();
// `Resume()` can synchronously delete this navigation throttle, so no code
// after this call should reference the throttle instance.
}
}
void SubframeHistoryNavigationThrottle::Cancel() {
CancelDeferredNavigation(CANCEL_AND_IGNORE);
}
// static
std::unique_ptr<NavigationThrottle>
SubframeHistoryNavigationThrottle::MaybeCreateThrottleFor(
NavigationHandle* navigation_handle) {
// `main_frame_same_document_history_token()` will only be set if the
// navigation is a main-frame same-document history navigation and it might
// be cancelable by a navigate event. There's no need to defer the subframe
// navigation unless the navigate event might cancel the entire history
// traversal.
NavigationRequest* request = NavigationRequest::From(navigation_handle);
auto main_frame_token = request->main_frame_same_document_history_token();
if (!main_frame_token) {
return nullptr;
}
DCHECK(!request->IsInMainFrame());
RenderFrameHostImpl* root_frame_host =
request->frame_tree_node()->frame_tree().root()->current_frame_host();
NavigationRequest* root_frame_navigation_request =
root_frame_host->GetSameDocumentNavigationRequest(*main_frame_token);
// If the main-frame same-document history navigation already completed, the
// throttle is no longer necessary. This can happen when `request` is
// cross-document and had to wait on a slow beforeunload handler.
if (!root_frame_navigation_request) {
return nullptr;
}
auto throttle = std::make_unique<SubframeHistoryNavigationThrottle>(request);
root_frame_navigation_request->AddDeferredSubframeNavigationThrottle(
throttle->weak_factory_.GetWeakPtr());
return throttle;
}
} // namespace content
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