content/browser/renderer_host/code_cache_host_impl_unittest.cc

// Copyright 2025 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/code_cache_host_impl.h"

#include "base/command_line.h"
#include "base/containers/span.h"
#include "base/feature_list.h"
#include "base/files/scoped_temp_dir.h"
#include "base/functional/bind.h"
#include "base/functional/callback_forward.h"
#include "base/run_loop.h"
#include "base/task/sequenced_task_runner.h"
#include "base/test/bind.h"
#include "base/test/scoped_feature_list.h"
#include "base/time/time.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "content/browser/code_cache/generated_code_cache_context.h"
#include "content/browser/process_lock.h"
#include "content/browser/site_instance_impl.h"
#include "content/public/common/content_switches.h"
#include "content/public/test/browser_task_environment.h"
#include "content/public/test/test_browser_context.h"
#include "mojo/public/cpp/base/big_buffer.h"
#include "net/base/features.h"
#include "net/http/http_cache.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/public/common/features.h"

namespace content {

// Parametrized on whether strict isolation is activated or not.
class CodeCacheHostImplTest : public testing::Test,
                              public testing::WithParamInterface<bool> {
 public:
  CodeCacheHostImplTest() {
    base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
    if (IsSitePerProcessOrStricter()) {
      command_line->AppendSwitch(switches::kSitePerProcess);
    } else {
      command_line->RemoveSwitch(switches::kSitePerProcess);
      command_line->AppendSwitch(switches::kDisableSiteIsolation);
    }

    feature_list_.InitWithFeatures(
        {blink::features::kUsePersistentCacheForCodeCache,
         net::features::kSplitCacheByNetworkIsolationKey},
        {});
    CHECK(temp_dir_.CreateUniqueTempDir());
    generated_code_cache_context_ =
        base::MakeRefCounted<GeneratedCodeCacheContext>();
    generated_code_cache_context_->Initialize(temp_dir_.GetPath(), 0);
  }

  ~CodeCacheHostImplTest() override {
    generated_code_cache_context_->Shutdown();

    ChildProcessSecurityPolicyImpl* p =
        ChildProcessSecurityPolicyImpl::GetInstance();
    for (int renderer_id : added_renderers_) {
      p->Remove(renderer_id);
    }
  }

  bool IsSitePerProcessOrStricter() { return GetParam(); }

  void SetupRendererWithLock(int process_id, const GURL& url) {
    ChildProcessSecurityPolicyImpl* p =
        ChildProcessSecurityPolicyImpl::GetInstance();
    p->AddForTesting(process_id, &browser_context_);

    scoped_refptr<SiteInstanceImpl> site_instance =
        SiteInstanceImpl::CreateForTesting(&browser_context_, url);
    ChildProcessSecurityPolicyImpl::GetInstance()->LockProcess(
        site_instance->GetIsolationContext(), process_id, false,
        ProcessLock::FromSiteInfo(site_instance->GetSiteInfo()));

    added_renderers_.push_back(process_id);
  }

 protected:
  BrowserTaskEnvironment task_environment_;
  std::vector<int> added_renderers_;
  TestBrowserContext browser_context_;
  base::test::ScopedFeatureList feature_list_;
  base::ScopedTempDir temp_dir_;
  scoped_refptr<GeneratedCodeCacheContext> generated_code_cache_context_;
};

// PersistentCache is not supported on Fuchsia.
#if !BUILDFLAG(IS_FUCHSIA)

// Validates that improper site isolation setup (no valid process lock in
// renderer) leads to no use of the cache if full site isolation is activated.
// Under !IsSitePerProcessOrStricter() it instead means that the cache is usable
// and that entries are grouped under the same context for unlocked processes.
TEST_P(CodeCacheHostImplTest, PersistentCacheNoCachingWhenNoProperIsolation) {
  const base::Time response_time = base::Time::Now();
  const std::string data_str = "some data";
  const mojo_base::BigBuffer data(base::as_byte_span(data_str));
  const GURL url("http://example.com/script.js");

  // The lack of a SetupRendererWithLock call for this process ID means
  // `GetSecondaryKeyForCodeCache` will return an empty GURL, which causes this
  // renderer to use the shared context key.
  const int process_id = 12;
  {
    base::RunLoop runloop;
    auto quit_closure = runloop.QuitClosure();

    net::NetworkIsolationKey nik(net::SchemefulSite{url},
                                 net::SchemefulSite{url});

    GeneratedCodeCacheContext::RunOrPostTask(
        generated_code_cache_context_.get(), FROM_HERE,
        base::BindLambdaForTesting([&]() {
          CodeCacheHostImpl host(
              process_id, generated_code_cache_context_, nik,
              blink::StorageKey::CreateFirstParty(url::Origin::Create(url)));

          // No way to confirm right away but storing should fail when
          // !IsSitePerProcessOrStricter().
          host.DidGenerateCacheableMetadata(
              blink::mojom::CodeCacheType::kJavascript, url, response_time,
              data.Clone());

          if (IsSitePerProcessOrStricter()) {
            // No data was stored so fetching fails.
            host.FetchCachedCode(
                blink::mojom::CodeCacheType::kJavascript, url,
                base::BindOnce(
                    [&](base::OnceClosure quit_closure,
                        base::Time response_time, mojo_base::BigBuffer data) {
                      // Ensure data is empty.
                      EXPECT_EQ(response_time, base::Time());
                      EXPECT_EQ(data.byte_span(),
                                mojo_base::BigBuffer().byte_span());
                      std::move(quit_closure).Run();
                    },
                    quit_closure));
          } else {
            // Fetching of stored data succeeds.
            host.FetchCachedCode(
                blink::mojom::CodeCacheType::kJavascript, url,
                base::BindOnce(
                    [&](base::Time expected_response_time,
                        const std::string& expected_data,
                        base::OnceClosure quit_closure,
                        base::Time response_time, mojo_base::BigBuffer data) {
                      EXPECT_EQ(expected_response_time, response_time);
                      EXPECT_EQ(expected_data,
                                std::string(
                                    reinterpret_cast<const char*>(data.data()),
                                    data.size()));
                      std::move(quit_closure).Run();
                    },
                    response_time, data_str, quit_closure));
          }
        }));
    runloop.Run();
  }
}

TEST_P(CodeCacheHostImplTest,
       PersistentCacheLockedAndUnlockedProcessesShareNoData) {
  const base::Time response_time = base::Time::Now();
  const std::string data_str = "some data";
  const mojo_base::BigBuffer data(base::as_byte_span(data_str));

  const base::Time other_response_time = response_time + base::Minutes(1);
  const std::string other_data_str = "some other data";
  const mojo_base::BigBuffer other_data(base::as_byte_span(other_data_str));

  const GURL url("http://example.com/script.js");
  net::NetworkIsolationKey nik(net::SchemefulSite{url},
                               net::SchemefulSite{url});

  const int locked_process_id = 12;
  SetupRendererWithLock(locked_process_id, url);

  // The lack of a SetupRendererWithLock call for this process ID means
  // `GetSecondaryKeyForCodeCache` will return an empty GURL, which causes this
  // renderer to use the shared context key.
  const int unlocked_process_id = 24;

  // Locked process stores data.
  {
    GeneratedCodeCacheContext::RunOrPostTask(
        generated_code_cache_context_.get(), FROM_HERE,
        base::BindLambdaForTesting([&]() {
          CodeCacheHostImpl host(
              locked_process_id, generated_code_cache_context_, nik,
              blink::StorageKey::CreateFirstParty(url::Origin::Create(url)));

          host.DidGenerateCacheableMetadata(
              blink::mojom::CodeCacheType::kJavascript, url, response_time,
              data.Clone());
        }));
  }

  // Unlocked process.
  {
    base::RunLoop runloop;
    auto quit_closure = runloop.QuitClosure();

    GeneratedCodeCacheContext::RunOrPostTask(
        generated_code_cache_context_.get(), FROM_HERE,
        base::BindLambdaForTesting([&]() {
          CodeCacheHostImpl host(
              unlocked_process_id, generated_code_cache_context_, nik,
              blink::StorageKey::CreateFirstParty(url::Origin::Create(url)));

          // Unlocked process cannot see the data stored by the locked process,
          // even with the same NIK.
          host.FetchCachedCode(
              blink::mojom::CodeCacheType::kJavascript, url,

              base::BindOnce(
                  [&](base::OnceClosure quit_closure, base::Time response_time,
                      mojo_base::BigBuffer data) {
                    // Ensure data is empty.
                    EXPECT_EQ(response_time, base::Time());
                    EXPECT_EQ(data.byte_span(),
                              mojo_base::BigBuffer().byte_span());
                    std::move(quit_closure).Run();
                  },
                  quit_closure));

          // Store some other data to attempt to retrieve it from the locked
          // process.
          host.DidGenerateCacheableMetadata(
              blink::mojom::CodeCacheType::kJavascript, url,
              other_response_time, other_data.Clone());
        }));
    runloop.Run();
  }

  // Locked process cannot access data stored from shared context.
  {
    base::RunLoop runloop;
    auto quit_closure = runloop.QuitClosure();

    GeneratedCodeCacheContext::RunOrPostTask(
        generated_code_cache_context_.get(), FROM_HERE,
        base::BindLambdaForTesting([&]() {
          CodeCacheHostImpl host(
              locked_process_id, generated_code_cache_context_, nik,
              blink::StorageKey::CreateFirstParty(url::Origin::Create(url)));

          // Locked process cannot see the data stored by the unlocked process
          // and sees its own copy, even with the same NIK.
          host.FetchCachedCode(
              blink::mojom::CodeCacheType::kJavascript, url,

              base::BindOnce(
                  [&](base::Time expected_response_time,
                      const std::string& expected_data,
                      base::OnceClosure quit_closure, base::Time response_time,
                      mojo_base::BigBuffer data) {
                    EXPECT_EQ(expected_response_time, response_time);
                    EXPECT_EQ(
                        expected_data,
                        std::string(reinterpret_cast<const char*>(data.data()),
                                    data.size()));
                    std::move(quit_closure).Run();
                  },
                  response_time, data_str, quit_closure));
        }));
    runloop.Run();
  }
}

// This test is parameterized to run with and without strict site isolation
// enabled. With a locked process, caching should succeed regardless of the
// isolation mode.
TEST_P(CodeCacheHostImplTest, PersistentCacheWriteAndReadFullIsolationSetup) {
  const base::Time response_time = base::Time::Now();
  const std::string data_str = "some data";
  const mojo_base::BigBuffer data(base::as_byte_span(data_str));
  const GURL original_resource_url("http://example.com/script.js");

  // Storing and retrieving for from the same isolation context works.
  {
    base::RunLoop runloop;
    auto quit_closure = runloop.QuitClosure();

    GURL url = original_resource_url;
    net::NetworkIsolationKey nik(net::SchemefulSite{url},
                                 net::SchemefulSite{url});

    const int process_id = 12;
    SetupRendererWithLock(process_id, url);

    GeneratedCodeCacheContext::RunOrPostTask(
        generated_code_cache_context_.get(), FROM_HERE,
        base::BindLambdaForTesting([&]() {
          CodeCacheHostImpl host(
              process_id, generated_code_cache_context_, nik,
              blink::StorageKey::CreateFirstParty(url::Origin::Create(url)));

          host.DidGenerateCacheableMetadata(
              blink::mojom::CodeCacheType::kJavascript, url, response_time,
              data.Clone());

          host.FetchCachedCode(
              blink::mojom::CodeCacheType::kJavascript, url,

              base::BindOnce(
                  [&](base::Time expected_response_time,
                      const std::string& expected_data,
                      base::OnceClosure quit_closure, base::Time response_time,
                      mojo_base::BigBuffer data) {
                    EXPECT_EQ(expected_response_time, response_time);
                    EXPECT_EQ(
                        expected_data,
                        std::string(reinterpret_cast<const char*>(data.data()),
                                    data.size()));
                    std::move(quit_closure).Run();
                  },
                  response_time, data_str, quit_closure));
        }));
    runloop.Run();
  }

  // Attempting to retrieve code for `original_resource_url` from a different
  // isolation context does not work and instead returns default values.
  {
    base::RunLoop runloop;
    auto quit_closure = runloop.QuitClosure();

    GURL url("http://other.com/script.js");
    net::NetworkIsolationKey nik(net::SchemefulSite{url},
                                 net::SchemefulSite{url});

    const int process_id = 24;
    SetupRendererWithLock(process_id, url);

    GeneratedCodeCacheContext::RunOrPostTask(
        generated_code_cache_context_.get(), FROM_HERE,
        base::BindLambdaForTesting([&]() {
          CodeCacheHostImpl host(
              process_id, generated_code_cache_context_, nik,
              blink::StorageKey::CreateFirstParty(url::Origin::Create(url)));
          host.FetchCachedCode(
              blink::mojom::CodeCacheType::kJavascript, original_resource_url,

              base::BindOnce(
                  [&](base::OnceClosure quit_closure, base::Time response_time,
                      mojo_base::BigBuffer data) {
                    // Ensure data is empty.
                    EXPECT_EQ(response_time, base::Time());
                    EXPECT_EQ(data.byte_span(),
                              mojo_base::BigBuffer().byte_span());
                    std::move(quit_closure).Run();
                  },
                  quit_closure));
        }));
    runloop.Run();
  }
}

INSTANTIATE_TEST_SUITE_P(All,
                         CodeCacheHostImplTest,
                         testing::Values(true, false));

#endif  // !BUILDFLAG(IS_FUCHSIA)

}  // namespace content