// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/component_updater/configurator_impl.h"

#include <algorithm>
#include <optional>
#include <string>
#include <vector>

#include "base/containers/flat_map.h"
#include "base/enterprise_util.h"
#include "base/feature_list.h"
#include "base/functional/callback.h"
#include "base/sequence_checker.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/time/time.h"
#include "base/version.h"
#include "build/build_config.h"
#include "components/component_updater/component_updater_switches.h"
#include "components/component_updater/component_updater_url_constants.h"
#include "components/update_client/command_line_config_policy.h"
#include "components/update_client/protocol_handler.h"
#include "components/update_client/utils.h"
#include "components/version_info/version_info.h"
#include "net/base/network_change_notifier.h"
#include "url/gurl.h"

#if BUILDFLAG(IS_WIN)
#include "base/win/win_util.h"
#endif

namespace component_updater {

ConfiguratorImpl::ConfiguratorImpl(
    const update_client::CommandLineConfigPolicy& config_policy,
    bool require_encryption)
    : background_downloads_enabled_(config_policy.BackgroundDownloadsEnabled()),
      deltas_enabled_(config_policy.DeltaUpdatesEnabled()),
      fast_update_(config_policy.FastUpdate()),
      pings_enabled_(config_policy.PingsEnabled()),
      require_encryption_(require_encryption),
      url_source_override_(config_policy.UrlSourceOverride()),
      initial_delay_(config_policy.InitialDelay()) {
  if (config_policy.TestRequest()) {
    extra_info_["testrequest"] = "1";
    extra_info_["testsource"] = "dev";
  }
}

ConfiguratorImpl::~ConfiguratorImpl() = default;

base::TimeDelta ConfiguratorImpl::InitialDelay() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  if (!initial_delay_.is_zero()) {
    return initial_delay_;
  }
  return fast_update_ ? base::Seconds(10) : base::Minutes(1);
}

base::TimeDelta ConfiguratorImpl::NextCheckDelay() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return base::Hours(5);
}

base::TimeDelta ConfiguratorImpl::OnDemandDelay() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return fast_update_ ? base::Seconds(2) : base::Minutes(30);
}

base::TimeDelta ConfiguratorImpl::UpdateDelay() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return fast_update_ ? base::Seconds(10) : base::Minutes(15);
}

std::vector<GURL> ConfiguratorImpl::UpdateUrl() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  if (url_source_override_.is_valid()) {
    return {GURL(url_source_override_)};
  }

  std::vector<GURL> urls{GURL(kUpdaterJSONDefaultUrl),
                         GURL(kUpdaterJSONFallbackUrl)};
  if (require_encryption_) {
    update_client::RemoveUnsecureUrls(&urls);
  }

  return urls;
}

std::vector<GURL> ConfiguratorImpl::PingUrl() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return pings_enabled_ ? UpdateUrl() : std::vector<GURL>();
}

const base::Version& ConfiguratorImpl::GetBrowserVersion() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return version_info::GetVersion();
}

std::string ConfiguratorImpl::GetOSLongName() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return std::string(version_info::GetOSType());
}

base::flat_map<std::string, std::string> ConfiguratorImpl::ExtraRequestParams()
    const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return extra_info_;
}

std::string ConfiguratorImpl::GetDownloadPreference() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return std::string();
}

bool ConfiguratorImpl::EnabledDeltas() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return deltas_enabled_;
}

bool ConfiguratorImpl::EnabledComponentUpdates() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return true;
}

bool ConfiguratorImpl::EnabledBackgroundDownloader() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return background_downloads_enabled_;
}

bool ConfiguratorImpl::EnabledCupSigning() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return true;
}

// The default implementation for most embedders returns an empty string.
// Desktop embedders, such as the Windows component updater can provide a
// meaningful implementation for this function.
std::string ConfiguratorImpl::GetAppGuid() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return {};
}

std::unique_ptr<update_client::ProtocolHandlerFactory>
ConfiguratorImpl::GetProtocolHandlerFactory() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return std::make_unique<update_client::ProtocolHandlerFactoryJSON>();
}

// Returns a "do nothing" callback which returns an empty updater state.
// This is the correct default for all the embedders except the component
// updater for Chrome on macOS and Windows, which includes a recovery
// component.
update_client::UpdaterStateProvider ConfiguratorImpl::GetUpdaterStateProvider()
    const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return base::BindRepeating([](bool /*is_machine*/) {
    return base::flat_map<std::string, std::string>();
  });
}

std::optional<bool> ConfiguratorImpl::IsMachineExternallyManaged() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
#if BUILDFLAG(IS_WIN) || BUILDFLAG(IS_MAC)
  // TODO(crbug.com/40836987): For legacy compatibility, this uses
  // IsEnterpriseDevice() which effectively equates to a domain join check.
  // Consider whether this should use IsManagedDevice() instead.
  return base::IsEnterpriseDevice();
#else
  return std::nullopt;
#endif  // BUILDFLAG(IS_WIN) || BUILDFLAG(IS_MAC)
}

bool ConfiguratorImpl::IsConnectionMetered() const {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  return net::NetworkChangeNotifier::GetConnectionCost() ==
         net::NetworkChangeNotifier::CONNECTION_COST_METERED;
}

}  // namespace component_updater