1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
content / browser / renderer_host / subframe_history_navigation_throttle.cc [blame]
// 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.
return DEFER;
}
NavigationThrottle::ThrottleCheckResult
SubframeHistoryNavigationThrottle::WillCommitWithoutUrlLoader() {
// This will defer same-document subframe history commits.
return DEFER;
}
const char* SubframeHistoryNavigationThrottle::GetNameForLogging() {
return "SubframeHistoryNavigationThrottle";
}
void SubframeHistoryNavigationThrottle::Resume() {
NavigationThrottle::Resume();
}
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