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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/chromeos/policy/dlp/dlp_confidential_contents.h"
#include <algorithm>
#include <sstream>
#include <string>
#include "base/test/metrics/histogram_tester.h"
#include "base/test/test_mock_time_task_runner.h"
#include "chrome/browser/chromeos/policy/dlp/dlp_rules_manager.h"
#include "chrome/test/base/testing_profile.h"
#include "components/enterprise/data_controls/core/browser/dlp_histogram_helper.h"
#include "content/public/browser/web_contents.h"
#include "content/public/test/browser_task_environment.h"
#include "content/public/test/test_renderer_host.h"
#include "content/public/test/web_contents_tester.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "url/gurl.h"
namespace policy {
constexpr DlpRulesManager::Restriction kRestriction =
DlpRulesManager::Restriction::kPrinting;
class DlpConfidentialContentsTest : public testing::Test {
public:
const std::u16string title1 = u"Example1";
const std::u16string title2 = u"Example2";
const std::u16string title3 = u"Example3";
const GURL url1 = GURL("https://example1.com");
const GURL url2 = GURL("https://example2.com");
const GURL url3 = GURL("https://example3.com");
DlpConfidentialContentsTest()
: profile_(std::make_unique<TestingProfile>()) {}
DlpConfidentialContentsTest(const DlpConfidentialContentsTest&) = delete;
DlpConfidentialContentsTest& operator=(const DlpConfidentialContentsTest&) =
delete;
~DlpConfidentialContentsTest() override = default;
std::unique_ptr<content::WebContents> CreateWebContents(
const std::u16string& title,
const GURL& url) {
std::unique_ptr<content::WebContents> web_contents =
content::WebContentsTester::CreateTestWebContents(profile_.get(),
nullptr);
content::WebContentsTester* tester =
content::WebContentsTester::For(web_contents.get());
tester->SetTitle(title);
tester->SetLastCommittedURL(url);
return web_contents;
}
DlpConfidentialContent CreateConfidentialContent(const std::u16string& title,
const GURL& url) {
return DlpConfidentialContent(CreateWebContents(title, url).get());
}
// Helper to check whether |contents| has an element corresponding to
// |web_contents|.
bool Contains(const DlpConfidentialContents& contents,
content::WebContents* web_contents) {
return std::ranges::any_of(contents.GetContents(),
[&](const DlpConfidentialContent& content) {
return content.url.EqualsIgnoringRef(
web_contents->GetLastCommittedURL());
});
}
protected:
base::HistogramTester histogram_tester_;
private:
content::BrowserTaskEnvironment task_environment_;
content::RenderViewHostTestEnabler render_view_host_test_enabler_;
const std::unique_ptr<TestingProfile> profile_;
};
TEST_F(DlpConfidentialContentsTest, ComparisonWithDifferentUrls) {
DlpConfidentialContent content1 = CreateConfidentialContent(title1, url1);
DlpConfidentialContent content2 = CreateConfidentialContent(title2, url2);
EXPECT_TRUE(content1 != content2);
EXPECT_TRUE(content1 < content2);
EXPECT_TRUE(content1 <= content2);
EXPECT_TRUE(content2 > content1);
EXPECT_TRUE(content2 >= content1);
}
TEST_F(DlpConfidentialContentsTest, ComparisonWithSameUrls) {
DlpConfidentialContent content1 = CreateConfidentialContent(title1, url1);
DlpConfidentialContent content2 = CreateConfidentialContent(title2, url1);
EXPECT_TRUE(content1 == content2);
EXPECT_FALSE(content1 != content2);
EXPECT_FALSE(content1 < content2);
EXPECT_TRUE(content1 <= content2);
EXPECT_FALSE(content2 > content1);
EXPECT_TRUE(content2 >= content1);
}
TEST_F(DlpConfidentialContentsTest, ComparisonAfterAssignement) {
DlpConfidentialContent content1 = CreateConfidentialContent(title1, url1);
DlpConfidentialContent content2 = CreateConfidentialContent(title2, url2);
EXPECT_FALSE(content1 == content2);
content2 = content1;
EXPECT_TRUE(content1 == content2);
}
TEST_F(DlpConfidentialContentsTest, EqualityIgnoresTheRef) {
const GURL url1 = GURL("https://example.com#first_ref");
const GURL url2 = GURL("https://example.com#second_ref");
EXPECT_NE(url1, url2);
EXPECT_TRUE(url1.EqualsIgnoringRef(url2));
DlpConfidentialContent content1 = CreateConfidentialContent(title1, url1);
DlpConfidentialContent content2 = CreateConfidentialContent(title2, url2);
EXPECT_EQ(content1, content2);
}
TEST_F(DlpConfidentialContentsTest, EmptyContents) {
DlpConfidentialContents contents;
EXPECT_TRUE(contents.IsEmpty());
}
TEST_F(DlpConfidentialContentsTest, DuplicateConfidentialDataAdded) {
DlpConfidentialContents contents;
auto web_contents = CreateWebContents(title1, url1);
contents.Add(web_contents.get());
contents.Add(web_contents.get());
EXPECT_EQ(contents.GetContents().size(), 1u);
EXPECT_TRUE(Contains(contents, web_contents.get()));
}
TEST_F(DlpConfidentialContentsTest, ClearAndAdd) {
DlpConfidentialContents contents;
auto web_contents1 = CreateWebContents(title1, url1);
auto web_contents2 = CreateWebContents(title2, url2);
auto web_contents3 = CreateWebContents(title3, url3);
contents.Add(web_contents1.get());
contents.Add(web_contents2.get());
EXPECT_EQ(contents.GetContents().size(), 2u);
contents.ClearAndAdd(CreateWebContents(title3, url3).get());
EXPECT_EQ(contents.GetContents().size(), 1u);
EXPECT_FALSE(Contains(contents, web_contents1.get()));
EXPECT_FALSE(Contains(contents, web_contents2.get()));
EXPECT_TRUE(Contains(contents, web_contents3.get()));
}
TEST_F(DlpConfidentialContentsTest, InsertOrUpdateDropsDuplicates) {
DlpConfidentialContents contents1;
DlpConfidentialContents contents2;
auto web_contents1 = CreateWebContents(title1, url1);
auto web_contents2 = CreateWebContents(title2, url2);
auto web_contents3 = CreateWebContents(title3, url3);
contents1.Add(web_contents1.get());
contents1.Add(web_contents2.get());
contents2.Add(web_contents1.get());
contents2.Add(web_contents3.get());
EXPECT_EQ(contents1.GetContents().size(), 2u);
EXPECT_EQ(contents2.GetContents().size(), 2u);
EXPECT_FALSE(Contains(contents1, web_contents3.get()));
contents1.InsertOrUpdate(contents2);
EXPECT_EQ(contents1.GetContents().size(), 3u);
EXPECT_EQ(contents2.GetContents().size(), 2u);
EXPECT_TRUE(Contains(contents1, web_contents3.get()));
}
TEST_F(DlpConfidentialContentsTest, InsertOrUpdateUpdatesTitles) {
const GURL url1 = GURL("https://example.com#first_ref");
const GURL url2 = GURL("https://example.com#second_ref");
EXPECT_NE(url1, url2);
EXPECT_TRUE(url1.EqualsIgnoringRef(url2));
DlpConfidentialContents contents1;
DlpConfidentialContents contents2;
auto web_contents1 = CreateWebContents(title1, url1);
auto web_contents2 = CreateWebContents(title2, url2);
auto web_contents3 = CreateWebContents(title3, url3);
contents1.Add(web_contents1.get());
contents2.Add(web_contents2.get());
contents2.Add(web_contents3.get());
EXPECT_EQ(contents1.GetContents().begin()->title, title1);
contents1.InsertOrUpdate(contents2);
EXPECT_EQ(contents2.GetContents().size(), 2u);
EXPECT_EQ(contents1.GetContents().begin()->title, title2);
}
TEST_F(DlpConfidentialContentsTest, EqualityDoesNotDependOnOrder) {
DlpConfidentialContents contents1;
DlpConfidentialContents contents2;
auto web_contents1 = CreateWebContents(title1, url1);
auto web_contents2 = CreateWebContents(title2, url2);
auto web_contents3 = CreateWebContents(title3, url3);
contents1.Add(web_contents1.get());
contents1.Add(web_contents2.get());
contents2.Add(web_contents2.get());
contents2.Add(web_contents1.get());
EXPECT_TRUE(contents1 == contents2);
EXPECT_TRUE(EqualWithTitles(contents1, contents2));
contents1.Add(web_contents3.get());
EXPECT_TRUE(contents1 != contents2);
EXPECT_FALSE(EqualWithTitles(contents1, contents2));
}
TEST_F(DlpConfidentialContentsTest, EqualityDoesNotDependOnTitle) {
DlpConfidentialContents contents1;
DlpConfidentialContents contents2;
DlpConfidentialContents contents3;
auto web_contents1 = CreateWebContents(title1, url1);
auto web_contents2 = CreateWebContents(title2, url1);
contents1.Add(web_contents1.get());
contents2.Add(web_contents1.get());
contents3.Add(web_contents2.get());
EXPECT_TRUE(contents1 == contents2);
EXPECT_TRUE(EqualWithTitles(contents1, contents2));
EXPECT_TRUE(contents1 == contents3);
EXPECT_FALSE(EqualWithTitles(contents1, contents3));
}
TEST_F(DlpConfidentialContentsTest, CacheEvictsAfterTimeout) {
scoped_refptr<base::TestMockTimeTaskRunner> task_runner =
base::MakeRefCounted<base::TestMockTimeTaskRunner>();
DlpConfidentialContentsCache cache;
cache.SetTaskRunnerForTesting(task_runner);
DlpConfidentialContent content = CreateConfidentialContent(title1, url1);
cache.Cache(content, kRestriction);
EXPECT_TRUE(cache.Contains(content, kRestriction));
histogram_tester_.ExpectBucketCount(
data_controls::GetDlpHistogramPrefix() +
data_controls::dlp::kConfidentialContentsCount,
1, 1);
task_runner->FastForwardBy(DlpConfidentialContentsCache::GetCacheTimeout());
EXPECT_FALSE(cache.Contains(content, kRestriction));
}
TEST_F(DlpConfidentialContentsTest, CacheEvictsWhenFull) {
DlpConfidentialContentsCache cache;
DlpConfidentialContent content1 = CreateConfidentialContent(title1, url1);
cache.Cache(content1, kRestriction);
histogram_tester_.ExpectBucketCount(
data_controls::GetDlpHistogramPrefix() +
data_controls::dlp::kConfidentialContentsCount,
1, 1);
for (int i = 2; i <= 100; i++) {
std::stringstream url;
url << "https://example";
url << i;
url << ".com";
cache.Cache(CreateConfidentialContent(u"title", GURL(url.str())),
kRestriction);
}
EXPECT_EQ(cache.GetSizeForTesting(), 100u);
histogram_tester_.ExpectBucketCount(
data_controls::GetDlpHistogramPrefix() +
data_controls::dlp::kConfidentialContentsCount,
100, 1);
EXPECT_EQ(histogram_tester_
.GetHistogramSamplesSinceCreation(
data_controls::GetDlpHistogramPrefix() +
data_controls::dlp::kConfidentialContentsCount)
->TotalCount(),
100);
// Add an additional item which should lead to the first one being evicted.
DlpConfidentialContent content101 =
CreateConfidentialContent(u"Example101", GURL("https://example101.com"));
cache.Cache(content101, kRestriction);
EXPECT_EQ(cache.GetSizeForTesting(), 100u);
EXPECT_FALSE(cache.Contains(content1, kRestriction));
EXPECT_TRUE(cache.Contains(content101, kRestriction));
EXPECT_EQ(histogram_tester_
.GetHistogramSamplesSinceCreation(
data_controls::GetDlpHistogramPrefix() +
data_controls::dlp::kConfidentialContentsCount)
->TotalCount(),
101);
histogram_tester_.ExpectBucketCount(
data_controls::GetDlpHistogramPrefix() +
data_controls::dlp::kConfidentialContentsCount,
100, 2);
}
TEST_F(DlpConfidentialContentsTest, CacheRemovesDuplicates) {
DlpConfidentialContentsCache cache;
DlpConfidentialContent content = CreateConfidentialContent(title1, url1);
cache.Cache(content, kRestriction);
cache.Cache(content, kRestriction);
EXPECT_EQ(cache.GetSizeForTesting(), 1u);
histogram_tester_.ExpectBucketCount(
data_controls::GetDlpHistogramPrefix() +
data_controls::dlp::kConfidentialContentsCount,
1, 1);
}
} // namespace policy
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