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
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
// Copyright 2020 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/client_hints/critical_client_hints_throttle.h"
#include "base/feature_list.h"
#include "base/metrics/histogram_functions.h"
#include "content/browser/client_hints/client_hints.h"
#include "content/browser/renderer_host/frame_tree_node.h"
#include "content/browser/renderer_host/navigation_request.h"
#include "content/common/features.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/client_hints_controller_delegate.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/content_client.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_util.h"
#include "services/metrics/public/cpp/ukm_builders.h"
#include "services/metrics/public/cpp/ukm_recorder.h"
#include "services/metrics/public/cpp/ukm_source_id.h"
#include "services/network/public/cpp/client_hints.h"
#include "services/network/public/cpp/features.h"
#include "services/network/public/mojom/parsed_headers.mojom-forward.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
#include "third_party/blink/public/common/client_hints/client_hints.h"
#include "third_party/blink/public/common/client_hints/enabled_client_hints.h"
#include "third_party/blink/public/common/loader/url_loader_throttle.h"
namespace {
using ::network::mojom::WebClientHintsType;
void LogCriticalCHStatus(CriticalCHRestart status) {
base::UmaHistogramEnumeration("ClientHints.CriticalCHRestart", status);
}
} // namespace
namespace content {
CriticalClientHintsThrottle::CriticalClientHintsThrottle(
BrowserContext* context,
ClientHintsControllerDelegate* client_hint_delegate,
FrameTreeNodeId frame_tree_node_id)
: context_(context),
client_hint_delegate_(client_hint_delegate),
frame_tree_node_id_(frame_tree_node_id) {
LogCriticalCHStatus(CriticalCHRestart::kNavigationStarted);
}
CriticalClientHintsThrottle::~CriticalClientHintsThrottle() = default;
void CriticalClientHintsThrottle::WillStartRequest(
network::ResourceRequest* request,
bool* defer) {
response_url_ = request->url;
initial_request_headers_ = request->headers;
}
void CriticalClientHintsThrottle::BeforeWillProcessResponse(
const GURL& response_url,
const network::mojom::URLResponseHead& response_head,
RestartWithURLReset* restart_with_url_reset) {
DCHECK_EQ(response_url, response_url_);
MaybeRestartWithHints(response_head, restart_with_url_reset);
}
void CriticalClientHintsThrottle::BeforeWillRedirectRequest(
net::RedirectInfo* redirect_info,
const network::mojom::URLResponseHead& response_head,
RestartWithURLReset* restart_with_url_reset,
std::vector<std::string>* to_be_removed_request_headers,
net::HttpRequestHeaders* modified_request_headers,
net::HttpRequestHeaders* modified_cors_exempt_request_headers) {
MaybeRestartWithHints(response_head, restart_with_url_reset);
response_url_ = redirect_info->new_url;
}
void CriticalClientHintsThrottle::MaybeRestartWithHints(
const network::mojom::URLResponseHead& response_head,
RestartWithURLReset* restart_with_url_reset) {
if (!base::FeatureList::IsEnabled(features::kCriticalClientHint))
return;
FrameTreeNode* frame_tree_node =
FrameTreeNode::GloballyFindByID(frame_tree_node_id_);
// Measure any usage of the header whether or not we take action on it.
auto* ukm_recorder = ukm::UkmRecorder::Get();
if (response_head.parsed_headers && frame_tree_node &&
frame_tree_node->navigation_request()) {
if (response_head.parsed_headers->critical_ch) {
for (const WebClientHintsType hint :
response_head.parsed_headers->critical_ch.value()) {
ukm::builders::ClientHints_CriticalCHHeaderUsage(
frame_tree_node->navigation_request()->GetNextPageUkmSourceId())
.SetType(static_cast<int64_t>(hint))
.Record(ukm_recorder->Get());
}
}
if (response_head.parsed_headers->accept_ch) {
for (const WebClientHintsType hint :
response_head.parsed_headers->accept_ch.value()) {
ukm::builders::ClientHints_AcceptCHHeaderUsage(
frame_tree_node->navigation_request()->GetNextPageUkmSourceId())
.SetType(static_cast<int64_t>(hint))
.Record(ukm_recorder->Get());
}
}
}
if (!response_head.parsed_headers ||
!response_head.parsed_headers->accept_ch ||
!response_head.parsed_headers->critical_ch)
return;
url::Origin response_origin = url::Origin::Create(response_url_);
// Only restart once per-Origin (per navigation)
if (restarted_origins_.contains(response_origin))
return;
if (!ShouldAddClientHints(response_origin, frame_tree_node,
client_hint_delegate_)) {
return;
}
// Ensure that only hints in the accept-ch header are examined
blink::EnabledClientHints hints;
for (const WebClientHintsType hint :
response_head.parsed_headers->accept_ch.value())
hints.SetIsEnabled(hint, true);
std::vector<WebClientHintsType> critical_hints;
for (const WebClientHintsType hint :
response_head.parsed_headers->critical_ch.value())
if (hints.IsEnabled(hint))
critical_hints.push_back(hint);
if (critical_hints.empty())
return;
LogCriticalCHStatus(CriticalCHRestart::kHeaderPresent);
if (!AreCriticalHintsMissing(response_origin, frame_tree_node,
client_hint_delegate_, critical_hints)) {
return;
}
ParseAndPersistAcceptCHForNavigation(response_origin,
response_head.parsed_headers,
response_head.headers.get(), context_,
client_hint_delegate_, frame_tree_node);
restarted_origins_.insert(response_origin);
net::HttpRequestHeaders modified_headers;
// TODO(crbug.com/40175866): If the frame tree node doesn't have an associated
// navigation_request (e.g. a service worker request) it might not override
// the user agent correctly.
if (frame_tree_node) {
AddNavigationRequestClientHintsHeaders(
response_origin, &modified_headers, context_, client_hint_delegate_,
frame_tree_node->navigation_request()->is_overriding_user_agent(),
frame_tree_node,
frame_tree_node->navigation_request()
->commit_params()
.frame_policy.container_policy);
} else {
AddPrefetchNavigationRequestClientHintsHeaders(
response_origin, &modified_headers, context_, client_hint_delegate_,
/*is_ua_override_on=*/false);
}
// If a client hint header is not in the original request,
// restart the request.
for (auto modified_header : modified_headers.GetHeaderVector()) {
if (!initial_request_headers_.HasHeader(modified_header.key)) {
LogCriticalCHStatus(CriticalCHRestart::kNavigationRestarted);
delegate_->DidRestartForCriticalClientHint();
*restart_with_url_reset = RestartWithURLReset(true);
return;
}
}
}
} // namespace content
|
