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
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
content / browser / preloading / prefetch / contamination_delay_browsertest.cc [blame]
// 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.
#include <optional>
#include "base/strings/string_number_conversions.h"
#include "base/test/metrics/histogram_tester.h"
#include "base/test/run_until.h"
#include "base/test/scoped_feature_list.h"
#include "base/test/test_timeouts.h"
#include "base/time/time.h"
#include "base/timer/elapsed_timer.h"
#include "content/browser/preloading/prefetch/mock_prefetch_service_delegate.h"
#include "content/browser/preloading/prefetch/prefetch_document_manager.h"
#include "content/browser/preloading/prefetch/prefetch_features.h"
#include "content/browser/preloading/prefetch/prefetch_service.h"
#include "content/browser/renderer_host/browsing_context_group_swap.h"
#include "content/browser/renderer_host/navigation_request.h"
#include "content/public/browser/prefetch_service_delegate.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/common/content_features.h"
#include "content/public/common/referrer.h"
#include "content/public/test/browser_test.h"
#include "content/public/test/browser_test_utils.h"
#include "content/public/test/content_browser_test.h"
#include "content/public/test/content_browser_test_utils.h"
#include "content/shell/browser/shell.h"
#include "net/http/http_status_code.h"
#include "net/test/embedded_test_server/embedded_test_server.h"
#include "net/test/embedded_test_server/http_response.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace content {
namespace {
class BrowsingContextGroupSwapObserver : public WebContentsObserver {
public:
explicit BrowsingContextGroupSwapObserver(WebContents* web_contents)
: WebContentsObserver(web_contents) {}
void DidFinishNavigation(NavigationHandle* navigation_handle) override {
latest_swap_ = NavigationRequest::From(navigation_handle)
->browsing_context_group_swap();
}
const BrowsingContextGroupSwap& Get() const { return latest_swap_.value(); }
private:
std::optional<BrowsingContextGroupSwap> latest_swap_;
};
class ContaminationDelayBrowserTest : public ContentBrowserTest {
protected:
ContaminationDelayBrowserTest() {
scoped_feature_list_.InitWithFeaturesAndParameters(
{{features::kPrefetchStateContaminationMitigation,
{{"swaps_bcg", "true"}}},
// This is needed specifically for CrOS MSAN, where we apply a 10x
// multiplier to all test timeouts, which happens to be enough to push
// the response delay in this test (which is scaled in that way to
// match the slowdown of everything else) over the default prefetch
// timeout. To be resilient also to changes in that value, it is
// expressly overridden here to be a timeout that is much longer and
// scales with the timeout multiplier.
{features::kPrefetchUseContentRefactor,
{{"prefetch_timeout_ms",
base::NumberToString(
TestTimeouts::action_max_timeout().InMilliseconds())}}}},
{});
}
void SetUpOnMainThread() override {
ContentBrowserTest::SetUpOnMainThread();
embedded_test_server()->ServeFilesFromSourceDirectory(
GetTestDataFilePath());
embedded_test_server()->RegisterRequestHandler(
base::BindRepeating(&ContaminationDelayBrowserTest::MaybeServeRequest,
base::Unretained(this)));
EXPECT_TRUE(embedded_test_server()->Start());
}
base::TimeDelta response_delay() const { return response_delay_; }
void set_response_delay(base::TimeDelta delay) { response_delay_ = delay; }
void Prefetch(const GURL& url) {
auto* prefetch_document_manager =
PrefetchDocumentManager::GetOrCreateForCurrentDocument(
shell()->web_contents()->GetPrimaryMainFrame());
auto candidate = blink::mojom::SpeculationCandidate::New();
candidate->url = url;
candidate->action = blink::mojom::SpeculationAction::kPrefetch;
candidate->eagerness = blink::mojom::SpeculationEagerness::kEager;
candidate->referrer = Referrer::SanitizeForRequest(
url, blink::mojom::Referrer(
shell()->web_contents()->GetURL(),
network::mojom::ReferrerPolicy::kStrictOriginWhenCrossOrigin));
std::vector<blink::mojom::SpeculationCandidatePtr> candidates;
candidates.push_back(std::move(candidate));
prefetch_document_manager->ProcessCandidates(candidates,
/*devtools_observer=*/nullptr);
ASSERT_TRUE(base::test::RunUntil([&] {
return prefetch_document_manager->GetReferringPageMetrics()
.prefetch_successful_count >= 1;
})) << "timed out waiting for prefetch to complete ("
<< prefetch_document_manager->GetReferringPageMetrics()
.prefetch_attempted_count
<< " attempted)";
}
private:
std::unique_ptr<net::test_server::HttpResponse> MaybeServeRequest(
const net::test_server::HttpRequest& request) {
GURL url = request.GetURL();
if (url.path_piece() == "/delayed") {
return std::make_unique<net::test_server::DelayedHttpResponse>(
response_delay());
}
if (url.path_piece() == "/redirect-cross-site") {
auto response = std::make_unique<net::test_server::DelayedHttpResponse>(
response_delay());
response->set_code(net::HTTP_TEMPORARY_REDIRECT);
response->AddCustomHeader("Location",
embedded_test_server()
->GetURL("prefetch.localhost", "/delayed")
.spec());
return response;
}
return nullptr;
}
base::test::ScopedFeatureList scoped_feature_list_;
base::TimeDelta response_delay_ = TestTimeouts::tiny_timeout() * 12;
};
IN_PROC_BROWSER_TEST_F(ContaminationDelayBrowserTest, CrossSite) {
set_response_delay(TestTimeouts::tiny_timeout() * 4);
GURL referrer_url =
embedded_test_server()->GetURL("referrer.localhost", "/title1.html");
GURL prefetch_url =
embedded_test_server()->GetURL("prefetch.localhost", "/delayed");
ASSERT_TRUE(NavigateToURL(shell(), referrer_url));
Prefetch(prefetch_url);
scoped_refptr<SiteInstance> site_instance =
shell()->web_contents()->GetSiteInstance();
base::HistogramTester histogram_tester;
BrowsingContextGroupSwapObserver swap_observer(shell()->web_contents());
base::ElapsedTimer timer;
ASSERT_TRUE(NavigateToURLFromRenderer(shell(), prefetch_url));
EXPECT_GE(timer.Elapsed(), response_delay());
EXPECT_EQ(BrowsingContextGroupSwapType::kSecuritySwap,
swap_observer.Get().type());
EXPECT_FALSE(site_instance->IsRelatedSiteInstance(
shell()->web_contents()->GetSiteInstance()));
histogram_tester.ExpectUniqueSample(
"Preloading.PrefetchBCGSwap.RelatedActiveContents", 1, 1);
}
IN_PROC_BROWSER_TEST_F(ContaminationDelayBrowserTest, IgnoresSameOrigin) {
GURL referrer_url =
embedded_test_server()->GetURL("referrer.localhost", "/title1.html");
GURL prefetch_url =
embedded_test_server()->GetURL("referrer.localhost", "/delayed");
ASSERT_TRUE(NavigateToURL(shell(), referrer_url));
Prefetch(prefetch_url);
BrowsingContextGroupSwapObserver swap_observer(shell()->web_contents());
base::ElapsedTimer timer;
ASSERT_TRUE(NavigateToURLFromRenderer(shell(), prefetch_url));
EXPECT_LT(timer.Elapsed(), response_delay());
EXPECT_THAT(swap_observer.Get().type(),
::testing::AnyOf(BrowsingContextGroupSwapType::kNoSwap,
BrowsingContextGroupSwapType::kProactiveSwap));
}
IN_PROC_BROWSER_TEST_F(ContaminationDelayBrowserTest, IgnoresSameSite) {
GURL referrer_url =
embedded_test_server()->GetURL("referrer.localhost", "/title1.html");
GURL prefetch_url =
embedded_test_server()->GetURL("sub.referrer.localhost", "/delayed");
ASSERT_TRUE(NavigateToURL(shell(), referrer_url));
Prefetch(prefetch_url);
BrowsingContextGroupSwapObserver swap_observer(shell()->web_contents());
base::ElapsedTimer timer;
ASSERT_TRUE(NavigateToURLFromRenderer(shell(), prefetch_url));
EXPECT_LT(timer.Elapsed(), response_delay());
EXPECT_THAT(swap_observer.Get().type(),
::testing::AnyOf(BrowsingContextGroupSwapType::kNoSwap,
BrowsingContextGroupSwapType::kProactiveSwap));
}
IN_PROC_BROWSER_TEST_F(ContaminationDelayBrowserTest, IgnoresIfExempt) {
GURL referrer_url =
embedded_test_server()->GetURL("referrer.localhost", "/title1.html");
GURL prefetch_url =
embedded_test_server()->GetURL("prefetch.localhost", "/delayed");
auto* prefetch_service = PrefetchService::GetFromFrameTreeNodeId(
shell()->web_contents()->GetPrimaryMainFrame()->GetFrameTreeNodeId());
auto owned_delegate = std::make_unique<MockPrefetchServiceDelegate>();
EXPECT_CALL(*owned_delegate, IsContaminationExempt(referrer_url))
.WillRepeatedly(testing::Return(true));
prefetch_service->SetPrefetchServiceDelegateForTesting(
std::move(owned_delegate));
ASSERT_TRUE(NavigateToURL(shell(), referrer_url));
Prefetch(prefetch_url);
BrowsingContextGroupSwapObserver swap_observer(shell()->web_contents());
base::ElapsedTimer timer;
ASSERT_TRUE(NavigateToURLFromRenderer(shell(), prefetch_url));
EXPECT_LT(timer.Elapsed(), response_delay());
EXPECT_THAT(swap_observer.Get().type(),
::testing::AnyOf(BrowsingContextGroupSwapType::kNoSwap,
BrowsingContextGroupSwapType::kProactiveSwap));
}
IN_PROC_BROWSER_TEST_F(ContaminationDelayBrowserTest, DelayAfterRedirect) {
set_response_delay(TestTimeouts::tiny_timeout() * 8);
GURL referrer_url =
embedded_test_server()->GetURL("referrer.localhost", "/title1.html");
GURL prefetch_url = embedded_test_server()->GetURL("referrer.localhost",
"/redirect-cross-site");
GURL commit_url =
embedded_test_server()->GetURL("prefetch.localhost", "/delayed");
ASSERT_TRUE(NavigateToURL(shell(), referrer_url));
Prefetch(prefetch_url);
scoped_refptr<SiteInstance> site_instance =
shell()->web_contents()->GetSiteInstance();
BrowsingContextGroupSwapObserver swap_observer(shell()->web_contents());
base::ElapsedTimer timer;
ASSERT_TRUE(NavigateToURLFromRenderer(shell(), prefetch_url, commit_url));
EXPECT_LT(timer.Elapsed(), response_delay() * 2);
EXPECT_GE(timer.Elapsed(), response_delay());
EXPECT_EQ(BrowsingContextGroupSwapType::kSecuritySwap,
swap_observer.Get().type());
EXPECT_FALSE(site_instance->IsRelatedSiteInstance(
shell()->web_contents()->GetSiteInstance()));
}
IN_PROC_BROWSER_TEST_F(ContaminationDelayBrowserTest,
CrossSiteWithRelatedContents) {
set_response_delay(TestTimeouts::tiny_timeout() * 4);
GURL referrer_url =
embedded_test_server()->GetURL("referrer.localhost", "/title1.html");
GURL prefetch_url =
embedded_test_server()->GetURL("prefetch.localhost", "/delayed");
ASSERT_TRUE(NavigateToURL(shell(), referrer_url));
Prefetch(prefetch_url);
Shell::CreateNewWindow(
shell()->web_contents()->GetBrowserContext(),
embedded_test_server()->GetURL("referrer.localhost", "/title2.html"),
shell()->web_contents()->GetSiteInstance(), {800, 600});
scoped_refptr<SiteInstance> site_instance =
shell()->web_contents()->GetSiteInstance();
base::HistogramTester histogram_tester;
BrowsingContextGroupSwapObserver swap_observer(shell()->web_contents());
base::ElapsedTimer timer;
ASSERT_TRUE(NavigateToURLFromRenderer(shell(), prefetch_url));
EXPECT_GE(timer.Elapsed(), response_delay());
EXPECT_EQ(BrowsingContextGroupSwapType::kSecuritySwap,
swap_observer.Get().type());
EXPECT_FALSE(site_instance->IsRelatedSiteInstance(
shell()->web_contents()->GetSiteInstance()));
histogram_tester.ExpectUniqueSample(
"Preloading.PrefetchBCGSwap.RelatedActiveContents", 2, 1);
}
} // namespace
} // namespace content