// Copyright 2014 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 "chrome/browser/extensions/extension_gcm_app_handler.h"

#include <memory>
#include <utility>
#include <vector>

#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_temp_dir.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ptr_util.h"
#include "base/memory/ref_counted.h"
#include "base/path_service.h"
#include "base/run_loop.h"
#include "base/sequenced_task_runner.h"
#include "base/task_scheduler/post_task.h"
#include "base/values.h"
#include "build/build_config.h"
#include "chrome/browser/chrome_notification_types.h"
#include "chrome/browser/extensions/api/gcm/gcm_api.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/extensions/test_extension_service.h"
#include "chrome/browser/extensions/test_extension_system.h"
#include "chrome/browser/gcm/gcm_product_util.h"
#include "chrome/browser/gcm/gcm_profile_service_factory.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
#include "chrome/browser/signin/signin_manager_factory.h"
#include "chrome/browser/ui/webui/signin/login_ui_service_factory.h"
#include "chrome/common/channel_info.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/test/base/testing_profile.h"
#include "components/gcm_driver/fake_gcm_app_handler.h"
#include "components/gcm_driver/fake_gcm_client.h"
#include "components/gcm_driver/fake_gcm_client_factory.h"
#include "components/gcm_driver/gcm_client_factory.h"
#include "components/gcm_driver/gcm_driver.h"
#include "components/gcm_driver/gcm_profile_service.h"
#include "components/keyed_service/core/keyed_service.h"
#include "components/signin/core/browser/signin_manager.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/storage_partition.h"
#include "content/public/test/test_browser_thread_bundle.h"
#include "content/public/test/test_utils.h"
#include "extensions/browser/extension_system.h"
#include "extensions/browser/uninstall_reason.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_builder.h"
#include "extensions/common/manifest.h"
#include "extensions/common/manifest_constants.h"
#include "extensions/common/permissions/api_permission.h"
#include "extensions/common/permissions/permissions_data.h"
#include "testing/gtest/include/gtest/gtest.h"

#if defined(OS_CHROMEOS)
#include "chrome/browser/chromeos/login/users/scoped_test_user_manager.h"
#include "chrome/browser/chromeos/settings/cros_settings.h"
#include "chrome/browser/chromeos/settings/device_settings_service.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#endif

namespace extensions {

namespace {

const char kTestExtensionName[] = "FooBar";

}  // namespace

// Helper class for asynchronous waiting.
class Waiter {
 public:
  Waiter() {}
  ~Waiter() {}

  // Waits until the asynchronous operation finishes.
  void WaitUntilCompleted() {
    run_loop_.reset(new base::RunLoop);
    run_loop_->Run();
  }

  // Signals that the asynchronous operation finishes.
  void SignalCompleted() {
    if (run_loop_ && run_loop_->running())
      run_loop_->Quit();
  }

  // Runs until UI loop becomes idle.
  void PumpUILoop() { base::RunLoop().RunUntilIdle(); }

  // Runs until IO loop becomes idle.
  void PumpIOLoop() {
    content::BrowserThread::PostTask(
        content::BrowserThread::IO, FROM_HERE,
        base::BindOnce(&Waiter::OnIOLoopPump, base::Unretained(this)));

    WaitUntilCompleted();
  }

 private:
  void PumpIOLoopCompleted() {
    DCHECK_CURRENTLY_ON(content::BrowserThread::UI);

    SignalCompleted();
  }

  void OnIOLoopPump() {
    DCHECK_CURRENTLY_ON(content::BrowserThread::IO);

    content::BrowserThread::PostTask(
        content::BrowserThread::IO, FROM_HERE,
        base::BindOnce(&Waiter::OnIOLoopPumpCompleted, base::Unretained(this)));
  }

  void OnIOLoopPumpCompleted() {
    DCHECK_CURRENTLY_ON(content::BrowserThread::IO);

    content::BrowserThread::PostTask(
        content::BrowserThread::UI, FROM_HERE,
        base::BindOnce(&Waiter::PumpIOLoopCompleted, base::Unretained(this)));
  }

  std::unique_ptr<base::RunLoop> run_loop_;

  DISALLOW_COPY_AND_ASSIGN(Waiter);
};

class FakeExtensionGCMAppHandler : public ExtensionGCMAppHandler {
 public:
  FakeExtensionGCMAppHandler(Profile* profile, Waiter* waiter)
      : ExtensionGCMAppHandler(profile),
        waiter_(waiter),
        unregistration_result_(gcm::GCMClient::UNKNOWN_ERROR),
        delete_id_result_(instance_id::InstanceID::UNKNOWN_ERROR),
        app_handler_count_drop_to_zero_(false) {
  }

  ~FakeExtensionGCMAppHandler() override {}

  void OnMessage(const std::string& app_id,
                 const gcm::IncomingMessage& message) override {}

  void OnMessagesDeleted(const std::string& app_id) override {}

  void OnSendError(
      const std::string& app_id,
      const gcm::GCMClient::SendErrorDetails& send_error_details) override {}

  void OnUnregisterCompleted(const std::string& app_id,
                             gcm::GCMClient::Result result) override {
    ExtensionGCMAppHandler::OnUnregisterCompleted(app_id, result);
    unregistration_result_ = result;
    waiter_->SignalCompleted();
  }

  void OnDeleteIDCompleted(const std::string& app_id,
                           instance_id::InstanceID::Result result) override {
    delete_id_result_ = result;
    ExtensionGCMAppHandler::OnDeleteIDCompleted(app_id, result);
  }

  void RemoveAppHandler(const std::string& app_id) override {
    ExtensionGCMAppHandler::RemoveAppHandler(app_id);
    if (GetGCMDriver()->app_handlers().empty())
      app_handler_count_drop_to_zero_ = true;
  }

  gcm::GCMClient::Result unregistration_result() const {
    return unregistration_result_;
  }
  instance_id::InstanceID::Result delete_id_result() const {
    return delete_id_result_;
  }
  bool app_handler_count_drop_to_zero() const {
    return app_handler_count_drop_to_zero_;
  }

 private:
  Waiter* waiter_;
  gcm::GCMClient::Result unregistration_result_;
  instance_id::InstanceID::Result delete_id_result_;
  bool app_handler_count_drop_to_zero_;

  DISALLOW_COPY_AND_ASSIGN(FakeExtensionGCMAppHandler);
};

class ExtensionGCMAppHandlerTest : public testing::Test {
 public:
  static std::unique_ptr<KeyedService> BuildGCMProfileService(
      content::BrowserContext* context) {
    Profile* profile = Profile::FromBrowserContext(context);
    scoped_refptr<base::SequencedTaskRunner> ui_thread =
        content::BrowserThread::GetTaskRunnerForThread(
            content::BrowserThread::UI);
    scoped_refptr<base::SequencedTaskRunner> io_thread =
        content::BrowserThread::GetTaskRunnerForThread(
            content::BrowserThread::IO);
    scoped_refptr<base::SequencedTaskRunner> blocking_task_runner(
        base::CreateSequencedTaskRunnerWithTraits(
            {base::MayBlock(), base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN}));
    return std::make_unique<gcm::GCMProfileService>(
        profile->GetPrefs(), profile->GetPath(), profile->GetRequestContext(),
        chrome::GetChannel(),
        gcm::GetProductCategoryForSubtypes(profile->GetPrefs()),
        std::unique_ptr<ProfileIdentityProvider>(new ProfileIdentityProvider(
            SigninManagerFactory::GetForProfile(profile),
            ProfileOAuth2TokenServiceFactory::GetForProfile(profile),
            LoginUIServiceFactory::GetShowLoginPopupCallbackForProfile(
                profile))),
        base::WrapUnique(new gcm::FakeGCMClientFactory(ui_thread, io_thread)),
        ui_thread, io_thread, blocking_task_runner);
  }

  ExtensionGCMAppHandlerTest()
      : thread_bundle_(content::TestBrowserThreadBundle::REAL_IO_THREAD),
        extension_service_(NULL),
        registration_result_(gcm::GCMClient::UNKNOWN_ERROR),
        unregistration_result_(gcm::GCMClient::UNKNOWN_ERROR) {}

  ~ExtensionGCMAppHandlerTest() override {}

  // Overridden from test::Test:
  void SetUp() override {
    ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());

    // Allow extension update to unpack crx in process.
    in_process_utility_thread_helper_.reset(
        new content::InProcessUtilityThreadHelper);

    // This is needed to create extension service under CrOS.
#if defined(OS_CHROMEOS)
    test_user_manager_.reset(new chromeos::ScopedTestUserManager());
    // Creating a DBus thread manager setter has the side effect of
    // creating a DBusThreadManager, which is needed for testing.
    // We don't actually need the setter so we ignore the return value.
    chromeos::DBusThreadManager::GetSetterForTesting();
#endif

    // Create a new profile.
    TestingProfile::Builder builder;
    profile_ = builder.Build();

    // Create extension service in order to uninstall the extension.
    TestExtensionSystem* extension_system(
        static_cast<TestExtensionSystem*>(ExtensionSystem::Get(profile())));
    base::FilePath extensions_install_dir =
        temp_dir_.GetPath().Append(FILE_PATH_LITERAL("Extensions"));
    extension_system->CreateExtensionService(
        base::CommandLine::ForCurrentProcess(), extensions_install_dir, false);
    extension_service_ = extension_system->Get(profile())->extension_service();

    // Create GCMProfileService that talks with fake GCMClient.
    gcm::GCMProfileServiceFactory::GetInstance()->SetTestingFactoryAndUse(
        profile(), &ExtensionGCMAppHandlerTest::BuildGCMProfileService);

    // Create a fake version of ExtensionGCMAppHandler.
    gcm_app_handler_.reset(new FakeExtensionGCMAppHandler(profile(), &waiter_));
  }

  void TearDown() override {
#if defined(OS_CHROMEOS)
    test_user_manager_.reset();
#endif

    waiter_.PumpUILoop();
    gcm_app_handler_->Shutdown();
    auto* partition =
        content::BrowserContext::GetDefaultStoragePartition(profile());
    if (partition)
      partition->WaitForDeletionTasksForTesting();
  }

  // Returns a barebones test extension.
  scoped_refptr<Extension> CreateExtension() {
    scoped_refptr<Extension> extension =
        ExtensionBuilder(kTestExtensionName)
            .AddPermission("gcm")
            .SetPath(temp_dir_.GetPath())
            .SetID("ldnnhddmnhbkjipkidpdiheffobcpfmf")
            .Build();
    EXPECT_TRUE(
        extension->permissions_data()->HasAPIPermission(APIPermission::kGcm));

    return extension;
  }

  void LoadExtension(const Extension* extension) {
    extension_service_->AddExtension(extension);
  }

  static bool IsCrxInstallerDone(extensions::CrxInstaller** installer,
                                 const content::NotificationSource& source,
                                 const content::NotificationDetails& details) {
    return content::Source<extensions::CrxInstaller>(source).ptr() ==
           *installer;
  }

  void UpdateExtension(const Extension* extension,
                       const std::string& update_crx) {
    base::FilePath data_dir;
    if (!PathService::Get(chrome::DIR_TEST_DATA, &data_dir)) {
      ADD_FAILURE();
      return;
    }
    data_dir = data_dir.AppendASCII("extensions");
    data_dir = data_dir.AppendASCII(update_crx);

    base::FilePath path = temp_dir_.GetPath();
    path = path.Append(data_dir.BaseName());
    ASSERT_TRUE(base::CopyFile(data_dir, path));

    extensions::CrxInstaller* installer = NULL;
    content::WindowedNotificationObserver observer(
        extensions::NOTIFICATION_CRX_INSTALLER_DONE,
        base::Bind(&IsCrxInstallerDone, &installer));
    extension_service_->UpdateExtension(
        extensions::CRXFileInfo(extension->id(), path), true, &installer);

    if (installer)
      observer.Wait();
  }

  void DisableExtension(const Extension* extension) {
    extension_service_->DisableExtension(extension->id(),
                                         disable_reason::DISABLE_USER_ACTION);
  }

  void EnableExtension(const Extension* extension) {
    extension_service_->EnableExtension(extension->id());
  }

  void UninstallExtension(const Extension* extension) {
    extension_service_->UninstallExtension(
        extension->id(),
        extensions::UNINSTALL_REASON_FOR_TESTING,
        NULL);
  }

  void Register(const std::string& app_id,
                const std::vector<std::string>& sender_ids) {
    GetGCMDriver()->Register(
        app_id,
        sender_ids,
        base::Bind(&ExtensionGCMAppHandlerTest::RegisterCompleted,
                   base::Unretained(this)));
  }

  void RegisterCompleted(const std::string& registration_id,
                         gcm::GCMClient::Result result) {
    registration_result_ = result;
    waiter_.SignalCompleted();
  }

  gcm::GCMDriver* GetGCMDriver() const {
    return gcm::GCMProfileServiceFactory::GetForProfile(profile())->driver();
  }

  bool HasAppHandlers(const std::string& app_id) const {
    return GetGCMDriver()->app_handlers().count(app_id);
  }

  Profile* profile() const { return profile_.get(); }
  Waiter* waiter() { return &waiter_; }
  FakeExtensionGCMAppHandler* gcm_app_handler() const {
    return gcm_app_handler_.get();
  }
  gcm::GCMClient::Result registration_result() const {
    return registration_result_;
  }
  gcm::GCMClient::Result unregistration_result() const {
    return unregistration_result_;
  }

 private:
  content::TestBrowserThreadBundle thread_bundle_;
  std::unique_ptr<content::InProcessUtilityThreadHelper>
      in_process_utility_thread_helper_;
  std::unique_ptr<TestingProfile> profile_;
  ExtensionService* extension_service_;  // Not owned.
  base::ScopedTempDir temp_dir_;

  // This is needed to create extension service under CrOS.
#if defined(OS_CHROMEOS)
  chromeos::ScopedTestDeviceSettingsService test_device_settings_service_;
  chromeos::ScopedTestCrosSettings test_cros_settings_;
  std::unique_ptr<chromeos::ScopedTestUserManager> test_user_manager_;
#endif

  Waiter waiter_;
  std::unique_ptr<FakeExtensionGCMAppHandler> gcm_app_handler_;
  gcm::GCMClient::Result registration_result_;
  gcm::GCMClient::Result unregistration_result_;

  DISALLOW_COPY_AND_ASSIGN(ExtensionGCMAppHandlerTest);
};

TEST_F(ExtensionGCMAppHandlerTest, AddAndRemoveAppHandler) {
  scoped_refptr<Extension> extension(CreateExtension());

  // App handler is added when extension is loaded.
  LoadExtension(extension.get());
  waiter()->PumpUILoop();
  EXPECT_TRUE(HasAppHandlers(extension->id()));

  // App handler is removed when extension is unloaded.
  DisableExtension(extension.get());
  waiter()->PumpUILoop();
  EXPECT_FALSE(HasAppHandlers(extension->id()));

  // App handler is added when extension is reloaded.
  EnableExtension(extension.get());
  waiter()->PumpUILoop();
  EXPECT_TRUE(HasAppHandlers(extension->id()));

  // App handler is removed when extension is uninstalled.
  UninstallExtension(extension.get());
  waiter()->WaitUntilCompleted();
  EXPECT_FALSE(HasAppHandlers(extension->id()));
}

TEST_F(ExtensionGCMAppHandlerTest, UnregisterOnExtensionUninstall) {
  scoped_refptr<Extension> extension(CreateExtension());
  LoadExtension(extension.get());

  // Kick off registration.
  std::vector<std::string> sender_ids;
  sender_ids.push_back("sender1");
  Register(extension->id(), sender_ids);
  waiter()->WaitUntilCompleted();
  EXPECT_EQ(gcm::GCMClient::SUCCESS, registration_result());

  // Both token deletion and unregistration should be triggered when the
  // extension is uninstalled.
  UninstallExtension(extension.get());
  waiter()->WaitUntilCompleted();
  EXPECT_EQ(instance_id::InstanceID::SUCCESS,
            gcm_app_handler()->delete_id_result());
  EXPECT_EQ(gcm::GCMClient::SUCCESS,
            gcm_app_handler()->unregistration_result());
}

TEST_F(ExtensionGCMAppHandlerTest, UpdateExtensionWithGcmPermissionKept) {
  scoped_refptr<Extension> extension(CreateExtension());

  // App handler is added when the extension is loaded.
  LoadExtension(extension.get());
  waiter()->PumpUILoop();
  EXPECT_TRUE(HasAppHandlers(extension->id()));

  // App handler count should not drop to zero when the extension is updated.
  UpdateExtension(extension.get(), "gcm2.crx");
  waiter()->PumpUILoop();
  EXPECT_FALSE(gcm_app_handler()->app_handler_count_drop_to_zero());
  EXPECT_TRUE(HasAppHandlers(extension->id()));
}

TEST_F(ExtensionGCMAppHandlerTest, UpdateExtensionWithGcmPermissionRemoved) {
  scoped_refptr<Extension> extension(CreateExtension());

  // App handler is added when the extension is loaded.
  LoadExtension(extension.get());
  waiter()->PumpUILoop();
  EXPECT_TRUE(HasAppHandlers(extension->id()));

  // App handler is removed when the extension is updated to the version that
  // has GCM permission removed.
  UpdateExtension(extension.get(), "good2.crx");
  waiter()->PumpUILoop();
  EXPECT_TRUE(gcm_app_handler()->app_handler_count_drop_to_zero());
  EXPECT_FALSE(HasAppHandlers(extension->id()));
}

}  // namespace extensions