// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/subresource_filter/content/renderer/subresource_filter_agent.h"

#include <memory>
#include <utility>

#include "base/files/file.h"
#include "base/macros.h"
#include "base/strings/string_piece.h"
#include "base/test/metrics/histogram_tester.h"
#include "base/time/time.h"
#include "components/subresource_filter/content/common/subresource_filter_messages.h"
#include "components/subresource_filter/content/renderer/unverified_ruleset_dealer.h"
#include "components/subresource_filter/core/common/document_load_statistics.h"
#include "components/subresource_filter/core/common/memory_mapped_ruleset.h"
#include "components/subresource_filter/core/common/scoped_timers.h"
#include "components/subresource_filter/core/common/test_ruleset_creator.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/public/platform/web_document_subresource_filter.h"
#include "third_party/blink/public/platform/web_url.h"
#include "third_party/blink/public/platform/web_url_error.h"
#include "third_party/blink/public/platform/web_url_request.h"
#include "url/gurl.h"

namespace subresource_filter {

namespace {

// The SubresourceFilterAgent with its dependencies on Blink mocked out.
//
// This approach is somewhat rudimentary, but appears to be the best compromise
// considering the alternatives:
//  -- Passing in a TestRenderFrame would itself require bringing up a
//     significant number of supporting classes.
//  -- Using a RenderViewTest would not allow having any non-filtered resource
//     loads due to not having a child thread and ResourceDispatcher.
// The real implementations of the mocked-out methods are exercised in:
//   chrome/browser/subresource_filter/subresource_filter_browsertest.cc.
class SubresourceFilterAgentUnderTest : public SubresourceFilterAgent {
 public:
  explicit SubresourceFilterAgentUnderTest(
      UnverifiedRulesetDealer* ruleset_dealer)
      : SubresourceFilterAgent(nullptr /* RenderFrame */, ruleset_dealer) {}
  ~SubresourceFilterAgentUnderTest() override = default;

  MOCK_METHOD0(GetDocumentURL, GURL());
  MOCK_METHOD0(OnSetSubresourceFilterForCommittedLoadCalled, void());
  MOCK_METHOD0(SignalFirstSubresourceDisallowedForCommittedLoad, void());
  MOCK_METHOD1(SendDocumentLoadStatistics, void(const DocumentLoadStatistics&));
  MOCK_METHOD0(SendFrameIsAdSubframe, void());

  bool IsMainFrame() override { return true; }

  void SetSubresourceFilterForCommittedLoad(
      std::unique_ptr<blink::WebDocumentSubresourceFilter> filter) override {
    last_injected_filter_ = std::move(filter);
    OnSetSubresourceFilterForCommittedLoadCalled();
  }

  bool IsAdSubframe() override { return is_ad_subframe_; }
  void SetIsAdSubframe() override { is_ad_subframe_ = true; }

  bool IsFilterAssociatedWithAdSubframe() {
    return last_injected_filter_->GetIsAssociatedWithAdSubframe();
  }

  blink::WebDocumentSubresourceFilter* filter() {
    return last_injected_filter_.get();
  }

  std::unique_ptr<blink::WebDocumentSubresourceFilter> TakeFilter() {
    return std::move(last_injected_filter_);
  }

 private:
  std::unique_ptr<blink::WebDocumentSubresourceFilter> last_injected_filter_;
  bool is_ad_subframe_ = false;

  DISALLOW_COPY_AND_ASSIGN(SubresourceFilterAgentUnderTest);
};

constexpr const char kTestFirstURL[] = "http://example.com/alpha";
constexpr const char kTestSecondURL[] = "http://example.com/beta";
constexpr const char kTestFirstURLPathSuffix[] = "alpha";
constexpr const char kTestSecondURLPathSuffix[] = "beta";
constexpr const char kTestBothURLsPathSuffix[] = "a";

// Histogram names.
constexpr const char kDocumentLoadRulesetIsAvailable[] =
    "SubresourceFilter.DocumentLoad.RulesetIsAvailable";
constexpr const char kDocumentLoadActivationLevel[] =
    "SubresourceFilter.DocumentLoad.ActivationState";
constexpr const char kSubresourcesEvaluated[] =
    "SubresourceFilter.DocumentLoad.NumSubresourceLoads.Evaluated";
constexpr const char kSubresourcesTotal[] =
    "SubresourceFilter.DocumentLoad.NumSubresourceLoads.Total";
constexpr const char kSubresourcesMatchedRules[] =
    "SubresourceFilter.DocumentLoad.NumSubresourceLoads.MatchedRules";
constexpr const char kSubresourcesDisallowed[] =
    "SubresourceFilter.DocumentLoad.NumSubresourceLoads.Disallowed";
constexpr const char kEvaluationTotalWallDuration[] =
    "SubresourceFilter.DocumentLoad.SubresourceEvaluation.TotalWallDuration";
constexpr const char kEvaluationTotalCPUDuration[] =
    "SubresourceFilter.DocumentLoad.SubresourceEvaluation.TotalCPUDuration";

}  // namespace

class SubresourceFilterAgentTest : public ::testing::Test {
 public:
  SubresourceFilterAgentTest() {}

 protected:
  void SetUp() override { ResetAgent(); }

  void ResetAgent() {
    agent_.reset(new ::testing::StrictMock<SubresourceFilterAgentUnderTest>(
        &ruleset_dealer_));
    ON_CALL(*agent(), GetDocumentURL())
        .WillByDefault(::testing::Return(GURL("http://example.com/")));
  }

  void SetTestRulesetToDisallowURLsWithPathSuffix(base::StringPiece suffix) {
    testing::TestRulesetPair test_ruleset_pair;
    ASSERT_NO_FATAL_FAILURE(
        test_ruleset_creator_.CreateRulesetToDisallowURLsWithPathSuffix(
            suffix, &test_ruleset_pair));
    ruleset_dealer_.SetRulesetFile(
        testing::TestRuleset::Open(test_ruleset_pair.indexed));
  }

  void StartLoadWithoutSettingActivationState() {
    agent_as_rfo()->DidStartProvisionalLoad(nullptr);
    agent_as_rfo()->DidCommitProvisionalLoad(
        true /* is_new_navigation */, false /* is_same_document_navigation */);
  }

  void PerformSameDocumentNavigationWithoutSettingActivationLevel() {
    agent_as_rfo()->DidStartProvisionalLoad(nullptr);
    agent_as_rfo()->DidCommitProvisionalLoad(
        true /* is_new_navigation */, true /* is_same_document_navigation */);
    // No DidFinishLoad is called in this case.
  }

  void StartLoadAndSetActivationState(ActivationState state,
                                      bool is_ad_subframe = false) {
    agent_as_rfo()->DidStartProvisionalLoad(nullptr);
    EXPECT_TRUE(agent_as_rfo()->OnMessageReceived(
        SubresourceFilterMsg_ActivateForNextCommittedLoad(0, state,
                                                          is_ad_subframe)));
    agent_as_rfo()->DidCommitProvisionalLoad(
        true /* is_new_navigation */, false /* is_same_document_navigation */);
  }

  void FinishLoad() { agent_as_rfo()->DidFinishLoad(); }

  void ExpectSubresourceFilterGetsInjected() {
    EXPECT_CALL(*agent(), GetDocumentURL());
    EXPECT_CALL(*agent(), OnSetSubresourceFilterForCommittedLoadCalled());
  }

  void ExpectNoSubresourceFilterGetsInjected() {
    EXPECT_CALL(*agent(), GetDocumentURL()).Times(::testing::AtLeast(0));
    EXPECT_CALL(*agent(), OnSetSubresourceFilterForCommittedLoadCalled())
        .Times(0);
  }

  void ExpectSignalAboutFirstSubresourceDisallowed() {
    EXPECT_CALL(*agent(), SignalFirstSubresourceDisallowedForCommittedLoad());
  }

  void ExpectNoSignalAboutFirstSubresourceDisallowed() {
    EXPECT_CALL(*agent(), SignalFirstSubresourceDisallowedForCommittedLoad())
        .Times(0);
  }

  void ExpectDocumentLoadStatisticsSent() {
    EXPECT_CALL(*agent(), SendDocumentLoadStatistics(::testing::_));
  }

  void ExpectSendFrameIsAdSubframe() {
    EXPECT_CALL(*agent(), SendFrameIsAdSubframe());
  }

  void ExpectNoSendFrameIsAdSubframe() {
    EXPECT_CALL(*agent(), SendFrameIsAdSubframe()).Times(0);
  }

  void ExpectLoadPolicy(
      base::StringPiece url_spec,
      blink::WebDocumentSubresourceFilter::LoadPolicy expected_policy) {
    blink::WebURL url = GURL(url_spec);
    blink::WebURLRequest::RequestContext request_context =
        blink::WebURLRequest::kRequestContextImage;
    blink::WebDocumentSubresourceFilter::LoadPolicy actual_policy =
        agent()->filter()->GetLoadPolicy(url, request_context);
    EXPECT_EQ(expected_policy, actual_policy);

    // If the load policy indicated the load was filtered, simulate a filtered
    // load callback. In production, this will be called in FrameFetchContext,
    // but we simulate the call here.
    if (actual_policy == blink::WebDocumentSubresourceFilter::kDisallow)
      agent()->filter()->ReportDisallowedLoad();
  }

  SubresourceFilterAgentUnderTest* agent() { return agent_.get(); }
  content::RenderFrameObserver* agent_as_rfo() {
    return static_cast<content::RenderFrameObserver*>(agent_.get());
  }

 private:
  testing::TestRulesetCreator test_ruleset_creator_;
  UnverifiedRulesetDealer ruleset_dealer_;

  std::unique_ptr<SubresourceFilterAgentUnderTest> agent_;

  DISALLOW_COPY_AND_ASSIGN(SubresourceFilterAgentTest);
};

TEST_F(SubresourceFilterAgentTest, DisabledByDefault_NoFilterIsInjected) {
  base::HistogramTester histogram_tester;
  ASSERT_NO_FATAL_FAILURE(
      SetTestRulesetToDisallowURLsWithPathSuffix(kTestBothURLsPathSuffix));
  ExpectNoSubresourceFilterGetsInjected();
  StartLoadWithoutSettingActivationState();
  FinishLoad();

  histogram_tester.ExpectUniqueSample(
      kDocumentLoadActivationLevel, static_cast<int>(ActivationLevel::DISABLED),
      1);
  histogram_tester.ExpectTotalCount(kDocumentLoadRulesetIsAvailable, 0);

  histogram_tester.ExpectTotalCount(kSubresourcesTotal, 0);
  histogram_tester.ExpectTotalCount(kSubresourcesEvaluated, 0);
  histogram_tester.ExpectTotalCount(kSubresourcesMatchedRules, 0);
  histogram_tester.ExpectTotalCount(kSubresourcesDisallowed, 0);

  histogram_tester.ExpectTotalCount(kEvaluationTotalWallDuration, 0);
  histogram_tester.ExpectTotalCount(kEvaluationTotalCPUDuration, 0);
}

TEST_F(SubresourceFilterAgentTest, MmapFailure_FailsToInjectSubresourceFilter) {
  ASSERT_NO_FATAL_FAILURE(
      SetTestRulesetToDisallowURLsWithPathSuffix(kTestFirstURLPathSuffix));
  MemoryMappedRuleset::SetMemoryMapFailuresForTesting(true);
  ExpectNoSubresourceFilterGetsInjected();
  StartLoadAndSetActivationState(ActivationState(ActivationLevel::ENABLED),
                                 false /* is_associated_with_ad_subframe */);
  ASSERT_TRUE(::testing::Mock::VerifyAndClearExpectations(agent()));

  MemoryMappedRuleset::SetMemoryMapFailuresForTesting(false);
  ExpectSubresourceFilterGetsInjected();
  StartLoadAndSetActivationState(ActivationState(ActivationLevel::ENABLED),
                                 false /* is_associated_with_ad_subframe */);
}

TEST_F(SubresourceFilterAgentTest, Disabled_NoFilterIsInjected) {
  ASSERT_NO_FATAL_FAILURE(
      SetTestRulesetToDisallowURLsWithPathSuffix(kTestBothURLsPathSuffix));
  ExpectNoSubresourceFilterGetsInjected();
  StartLoadAndSetActivationState(ActivationState(ActivationLevel::DISABLED));
  FinishLoad();
}

TEST_F(SubresourceFilterAgentTest,
       EnabledButRulesetUnavailable_NoFilterIsInjected) {
  base::HistogramTester histogram_tester;
  ExpectNoSubresourceFilterGetsInjected();
  StartLoadAndSetActivationState(ActivationState(ActivationLevel::ENABLED));
  FinishLoad();

  histogram_tester.ExpectUniqueSample(
      kDocumentLoadActivationLevel, static_cast<int>(ActivationLevel::ENABLED),
      1);
  histogram_tester.ExpectUniqueSample(kDocumentLoadRulesetIsAvailable, 0, 1);

  histogram_tester.ExpectTotalCount(kSubresourcesTotal, 0);
  histogram_tester.ExpectTotalCount(kSubresourcesEvaluated, 0);
  histogram_tester.ExpectTotalCount(kSubresourcesMatchedRules, 0);
  histogram_tester.ExpectTotalCount(kSubresourcesDisallowed, 0);

  histogram_tester.ExpectTotalCount(kEvaluationTotalWallDuration, 0);
  histogram_tester.ExpectTotalCount(kEvaluationTotalCPUDuration, 0);
}

// Never inject a filter for main frame about:blank loads, even though we do for
// subframe loads. Those are tested via browser tests.
// TODO(csharrison): Refactor these unit tests so it is easier to test with
// real backing RenderFrames.
TEST_F(SubresourceFilterAgentTest, EmptyDocumentLoad_NoFilterIsInjected) {
  base::HistogramTester histogram_tester;
  ExpectNoSubresourceFilterGetsInjected();
  EXPECT_CALL(*agent(), GetDocumentURL())
      .WillOnce(::testing::Return(GURL("about:blank")));
  StartLoadAndSetActivationState(ActivationState(ActivationLevel::ENABLED));
  FinishLoad();

  histogram_tester.ExpectTotalCount(kDocumentLoadActivationLevel, 0);
  histogram_tester.ExpectTotalCount(kDocumentLoadRulesetIsAvailable, 0);

  histogram_tester.ExpectTotalCount(kSubresourcesTotal, 0);
  histogram_tester.ExpectTotalCount(kSubresourcesEvaluated, 0);
  histogram_tester.ExpectTotalCount(kSubresourcesMatchedRules, 0);
  histogram_tester.ExpectTotalCount(kSubresourcesDisallowed, 0);

  histogram_tester.ExpectTotalCount(kEvaluationTotalWallDuration, 0);
  histogram_tester.ExpectTotalCount(kEvaluationTotalCPUDuration, 0);
}

TEST_F(SubresourceFilterAgentTest, Enabled_FilteringIsInEffectForOneLoad) {
  base::HistogramTester histogram_tester;
  ASSERT_NO_FATAL_FAILURE(
      SetTestRulesetToDisallowURLsWithPathSuffix(kTestFirstURLPathSuffix));

  ExpectSubresourceFilterGetsInjected();
  StartLoadAndSetActivationState(ActivationState(ActivationLevel::ENABLED));
  ASSERT_TRUE(::testing::Mock::VerifyAndClearExpectations(agent()));

  ExpectSignalAboutFirstSubresourceDisallowed();
  ExpectLoadPolicy(kTestFirstURL,
                   blink::WebDocumentSubresourceFilter::kDisallow);
  ExpectLoadPolicy(kTestSecondURL, blink::WebDocumentSubresourceFilter::kAllow);
  ExpectDocumentLoadStatisticsSent();
  FinishLoad();

  // In-page navigation should not count as a new load.
  ExpectNoSubresourceFilterGetsInjected();
  ExpectNoSignalAboutFirstSubresourceDisallowed();
  PerformSameDocumentNavigationWithoutSettingActivationLevel();
  ExpectLoadPolicy(kTestFirstURL,
                   blink::WebDocumentSubresourceFilter::kDisallow);
  ExpectLoadPolicy(kTestSecondURL, blink::WebDocumentSubresourceFilter::kAllow);

  ExpectNoSubresourceFilterGetsInjected();
  StartLoadWithoutSettingActivationState();
  FinishLoad();

  // Resource loads after the in-page navigation should not be counted toward
  // the figures below, as they came after the original page load event. There
  // should be no samples recorded into subresource count histograms during the
  // final load where there is no activation.
  histogram_tester.ExpectUniqueSample(kSubresourcesTotal, 2, 1);
  histogram_tester.ExpectUniqueSample(kSubresourcesEvaluated, 2, 1);
  histogram_tester.ExpectUniqueSample(kSubresourcesMatchedRules, 1, 1);
  histogram_tester.ExpectUniqueSample(kSubresourcesDisallowed, 1, 1);
  EXPECT_THAT(histogram_tester.GetAllSamples(kDocumentLoadActivationLevel),
              ::testing::ElementsAre(
                  base::Bucket(static_cast<int>(ActivationLevel::DISABLED), 1),
                  base::Bucket(static_cast<int>(ActivationLevel::ENABLED), 1)));
  histogram_tester.ExpectUniqueSample(kDocumentLoadRulesetIsAvailable, 1, 1);
}

TEST_F(SubresourceFilterAgentTest, Enabled_HistogramSamplesOverTwoLoads) {
  for (const bool measure_performance : {false, true}) {
    base::HistogramTester histogram_tester;
    ASSERT_NO_FATAL_FAILURE(
        SetTestRulesetToDisallowURLsWithPathSuffix(kTestFirstURLPathSuffix));
    ExpectSubresourceFilterGetsInjected();
    ActivationState state(ActivationLevel::ENABLED);
    state.measure_performance = measure_performance;
    StartLoadAndSetActivationState(state);
    ASSERT_TRUE(::testing::Mock::VerifyAndClearExpectations(agent()));

    ExpectSignalAboutFirstSubresourceDisallowed();
    ExpectLoadPolicy(kTestFirstURL,
                     blink::WebDocumentSubresourceFilter::kDisallow);
    ExpectNoSignalAboutFirstSubresourceDisallowed();
    ExpectLoadPolicy(kTestFirstURL,
                     blink::WebDocumentSubresourceFilter::kDisallow);
    ExpectNoSignalAboutFirstSubresourceDisallowed();
    ExpectLoadPolicy(kTestSecondURL,
                     blink::WebDocumentSubresourceFilter::kAllow);
    ExpectDocumentLoadStatisticsSent();
    FinishLoad();

    ExpectSubresourceFilterGetsInjected();
    StartLoadAndSetActivationState(state);
    ASSERT_TRUE(::testing::Mock::VerifyAndClearExpectations(agent()));

    ExpectNoSignalAboutFirstSubresourceDisallowed();
    ExpectLoadPolicy(kTestSecondURL,
                     blink::WebDocumentSubresourceFilter::kAllow);
    ExpectSignalAboutFirstSubresourceDisallowed();
    ExpectLoadPolicy(kTestFirstURL,
                     blink::WebDocumentSubresourceFilter::kDisallow);
    ExpectDocumentLoadStatisticsSent();
    FinishLoad();

    histogram_tester.ExpectUniqueSample(
        kDocumentLoadActivationLevel,
        static_cast<int>(ActivationLevel::ENABLED), 2);
    histogram_tester.ExpectUniqueSample(kDocumentLoadRulesetIsAvailable, 1, 2);

    EXPECT_THAT(histogram_tester.GetAllSamples(kSubresourcesTotal),
                ::testing::ElementsAre(base::Bucket(2, 1), base::Bucket(3, 1)));
    EXPECT_THAT(histogram_tester.GetAllSamples(kSubresourcesEvaluated),
                ::testing::ElementsAre(base::Bucket(2, 1), base::Bucket(3, 1)));
    EXPECT_THAT(histogram_tester.GetAllSamples(kSubresourcesMatchedRules),
                ::testing::ElementsAre(base::Bucket(1, 1), base::Bucket(2, 1)));
    EXPECT_THAT(histogram_tester.GetAllSamples(kSubresourcesDisallowed),
                ::testing::ElementsAre(base::Bucket(1, 1), base::Bucket(2, 1)));

    base::HistogramBase::Count expected_total_count =
        measure_performance && base::ThreadTicks::IsSupported() ? 2 : 0;
    histogram_tester.ExpectTotalCount(kEvaluationTotalWallDuration,
                                      expected_total_count);
    histogram_tester.ExpectTotalCount(kEvaluationTotalCPUDuration,
                                      expected_total_count);
  }
}

TEST_F(SubresourceFilterAgentTest, Enabled_NewRulesetIsPickedUpAtNextLoad) {
  ASSERT_NO_FATAL_FAILURE(
      SetTestRulesetToDisallowURLsWithPathSuffix(kTestFirstURLPathSuffix));
  ExpectSubresourceFilterGetsInjected();
  StartLoadAndSetActivationState(ActivationState(ActivationLevel::ENABLED));
  ASSERT_TRUE(::testing::Mock::VerifyAndClearExpectations(agent()));

  // Set the new ruleset just after the deadline for being used for the current
  // load, to exercises doing filtering based on obseleted rulesets.
  ASSERT_NO_FATAL_FAILURE(
      SetTestRulesetToDisallowURLsWithPathSuffix(kTestSecondURLPathSuffix));

  ExpectSignalAboutFirstSubresourceDisallowed();
  ExpectLoadPolicy(kTestFirstURL,
                   blink::WebDocumentSubresourceFilter::kDisallow);
  ExpectLoadPolicy(kTestSecondURL, blink::WebDocumentSubresourceFilter::kAllow);
  ExpectDocumentLoadStatisticsSent();
  FinishLoad();

  ExpectSubresourceFilterGetsInjected();
  StartLoadAndSetActivationState(ActivationState(ActivationLevel::ENABLED));
  ASSERT_TRUE(::testing::Mock::VerifyAndClearExpectations(agent()));

  ExpectSignalAboutFirstSubresourceDisallowed();
  ExpectLoadPolicy(kTestFirstURL, blink::WebDocumentSubresourceFilter::kAllow);
  ExpectLoadPolicy(kTestSecondURL,
                   blink::WebDocumentSubresourceFilter::kDisallow);
  ExpectDocumentLoadStatisticsSent();
  FinishLoad();
}

// Make sure that the activation decision does not outlive a failed provisional
// load (and affect the second next load).
TEST_F(SubresourceFilterAgentTest,
       Enabled_FilteringNoLongerEffectAfterProvisionalLoadIsCancelled) {
  ASSERT_NO_FATAL_FAILURE(
      SetTestRulesetToDisallowURLsWithPathSuffix(kTestBothURLsPathSuffix));
  ExpectNoSubresourceFilterGetsInjected();
  agent_as_rfo()->DidStartProvisionalLoad(nullptr);
  ActivationState state(ActivationLevel::ENABLED);
  state.measure_performance = true;
  EXPECT_TRUE(agent_as_rfo()->OnMessageReceived(
      SubresourceFilterMsg_ActivateForNextCommittedLoad(
          0, state, false /* is_ad_subframe */)));
  agent_as_rfo()->DidFailProvisionalLoad(
      blink::WebURLError(net::ERR_FAILED, blink::WebURL()));
  agent_as_rfo()->DidStartProvisionalLoad(nullptr);
  agent_as_rfo()->DidCommitProvisionalLoad(
      true /* is_new_navigation */, false /* is_same_document_navigation */);
  FinishLoad();
}

TEST_F(SubresourceFilterAgentTest, DryRun_ResourcesAreEvaluatedButNotFiltered) {
  base::HistogramTester histogram_tester;
  ASSERT_NO_FATAL_FAILURE(
      SetTestRulesetToDisallowURLsWithPathSuffix(kTestFirstURLPathSuffix));
  ExpectSubresourceFilterGetsInjected();
  StartLoadAndSetActivationState(ActivationState(ActivationLevel::DRYRUN));
  ASSERT_TRUE(::testing::Mock::VerifyAndClearExpectations(agent()));

  // In dry-run mode, loads to the first URL should be recorded as
  // `MatchedRules`, but still be allowed to proceed and not recorded as
  // `Disallowed`.
  ExpectLoadPolicy(kTestFirstURL,
                   blink::WebDocumentSubresourceFilter::kWouldDisallow);
  ExpectLoadPolicy(kTestFirstURL,
                   blink::WebDocumentSubresourceFilter::kWouldDisallow);
  ExpectLoadPolicy(kTestSecondURL, blink::WebDocumentSubresourceFilter::kAllow);
  ExpectDocumentLoadStatisticsSent();
  FinishLoad();

  histogram_tester.ExpectUniqueSample(kDocumentLoadActivationLevel,
                                      static_cast<int>(ActivationLevel::DRYRUN),
                                      1);
  histogram_tester.ExpectUniqueSample(kDocumentLoadRulesetIsAvailable, 1, 1);

  histogram_tester.ExpectUniqueSample(kSubresourcesTotal, 3, 1);
  histogram_tester.ExpectUniqueSample(kSubresourcesEvaluated, 3, 1);
  histogram_tester.ExpectUniqueSample(kSubresourcesMatchedRules, 2, 1);
  histogram_tester.ExpectUniqueSample(kSubresourcesDisallowed, 0, 1);

  // Performance measurement is switched off.
  histogram_tester.ExpectTotalCount(kEvaluationTotalWallDuration, 0);
  histogram_tester.ExpectTotalCount(kEvaluationTotalCPUDuration, 0);

  EXPECT_FALSE(agent()->IsFilterAssociatedWithAdSubframe());
  EXPECT_FALSE(agent()->IsAdSubframe());
}

TEST_F(SubresourceFilterAgentTest,
       SignalFirstSubresourceDisallowed_OncePerDocumentLoad) {
  ASSERT_NO_FATAL_FAILURE(
      SetTestRulesetToDisallowURLsWithPathSuffix(kTestFirstURLPathSuffix));
  ExpectSubresourceFilterGetsInjected();
  StartLoadAndSetActivationState(ActivationState(ActivationLevel::ENABLED));
  ASSERT_TRUE(::testing::Mock::VerifyAndClearExpectations(agent()));

  ExpectSignalAboutFirstSubresourceDisallowed();
  ExpectLoadPolicy(kTestFirstURL,
                   blink::WebDocumentSubresourceFilter::kDisallow);
  ExpectNoSignalAboutFirstSubresourceDisallowed();
  ExpectLoadPolicy(kTestFirstURL,
                   blink::WebDocumentSubresourceFilter::kDisallow);
  ExpectLoadPolicy(kTestSecondURL, blink::WebDocumentSubresourceFilter::kAllow);
  ExpectDocumentLoadStatisticsSent();
  FinishLoad();

  ExpectSubresourceFilterGetsInjected();
  StartLoadAndSetActivationState(ActivationState(ActivationLevel::ENABLED));
  ASSERT_TRUE(::testing::Mock::VerifyAndClearExpectations(agent()));

  ExpectLoadPolicy(kTestSecondURL, blink::WebDocumentSubresourceFilter::kAllow);
  ExpectSignalAboutFirstSubresourceDisallowed();
  ExpectLoadPolicy(kTestFirstURL,
                   blink::WebDocumentSubresourceFilter::kDisallow);
  ExpectDocumentLoadStatisticsSent();
  FinishLoad();
}

TEST_F(SubresourceFilterAgentTest,
       SignalFirstSubresourceDisallowed_ComesAfterAgentDestroyed) {
  ASSERT_NO_FATAL_FAILURE(
      SetTestRulesetToDisallowURLsWithPathSuffix(kTestFirstURLPathSuffix));
  ExpectSubresourceFilterGetsInjected();
  StartLoadAndSetActivationState(ActivationState(ActivationLevel::ENABLED));
  ASSERT_TRUE(::testing::Mock::VerifyAndClearExpectations(agent()));

  auto filter = agent()->TakeFilter();
  ResetAgent();

  // The filter has been disconnected from the agent, so a call to
  // reportDisallowedLoad() should not signal a first resource disallowed call
  // to the agent, nor should it cause a crash.
  ExpectNoSignalAboutFirstSubresourceDisallowed();

  filter->ReportDisallowedLoad();
}

TEST_F(SubresourceFilterAgentTest,
       DryRun_IsAssociatedWithAdSubframeforDocumentOrDedicatedWorker) {
  ASSERT_NO_FATAL_FAILURE(
      SetTestRulesetToDisallowURLsWithPathSuffix(kTestFirstURLPathSuffix));

  ExpectSubresourceFilterGetsInjected();
  StartLoadAndSetActivationState(ActivationState(ActivationLevel::DRYRUN),
                                 true /* is_associated_with_ad_subframe */);
  ASSERT_TRUE(::testing::Mock::VerifyAndClearExpectations(agent()));

  // Test the ad subframe value that is set at the filter.
  // This also represents the flag passed to a dedicated worker filter created.
  // For testing the flag passed to the dedicated worker filter, the unit test
  // is not able to test the implementation of WillCreateWorkerFetchContext as
  // that will require setup of a WebWorkerFetchContextImpl.
  EXPECT_TRUE(agent()->IsFilterAssociatedWithAdSubframe());
  EXPECT_TRUE(agent()->IsAdSubframe());
}

TEST_F(SubresourceFilterAgentTest, DryRun_FrameAlreadyTaggedAsAd) {
  agent()->SetIsAdSubframe();
  ASSERT_NO_FATAL_FAILURE(
      SetTestRulesetToDisallowURLsWithPathSuffix("somethingNotMatched"));
  ExpectSubresourceFilterGetsInjected();
  StartLoadAndSetActivationState(ActivationState(ActivationLevel::DRYRUN),
                                 false /* is_associated_with_ad_subframe */);
  ASSERT_TRUE(::testing::Mock::VerifyAndClearExpectations(agent()));

  EXPECT_TRUE(agent()->IsFilterAssociatedWithAdSubframe());
  EXPECT_TRUE(agent()->IsAdSubframe());
}

TEST_F(SubresourceFilterAgentTest, DryRun_SendsFrameIsAdSubframe) {
  agent()->SetIsAdSubframe();
  ExpectSendFrameIsAdSubframe();

  // Call DidCreateNewDocument twice and verify that SendFrameIsAdSubframe is
  // only called once.
  EXPECT_CALL(*agent(), GetDocumentURL())
      .WillOnce(::testing::Return(GURL("about:blank")));
  agent_as_rfo()->DidCreateNewDocument();
  agent_as_rfo()->DidCreateNewDocument();
}

TEST_F(SubresourceFilterAgentTest, DryRun_DoesNotSendFrameIsAdSubframe) {
  ExpectNoSendFrameIsAdSubframe();
  agent_as_rfo()->DidCreateNewDocument();
}

}  // namespace subresource_filter
