chromeos/components/drivefs/drivefs_host.cc

// Copyright 2018 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 "chromeos/components/drivefs/drivefs_host.h"

#include <map>
#include <set>
#include <utility>

#include "base/bind.h"
#include "base/strings/strcat.h"
#include "base/unguessable_token.h"
#include "chromeos/components/drivefs/drivefs_bootstrap.h"
#include "chromeos/components/drivefs/drivefs_host_observer.h"
#include "chromeos/components/drivefs/drivefs_search.h"
#include "chromeos/constants/chromeos_features.h"
#include "components/drive/drive_notification_manager.h"
#include "components/drive/drive_notification_observer.h"
#include "mojo/public/cpp/platform/platform_channel_endpoint.h"
#include "mojo/public/cpp/system/invitation.h"
#include "services/network/public/cpp/network_connection_tracker.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"

namespace drivefs {

namespace {

constexpr char kDataPath[] = "GCache/v2";

}  // namespace

std::unique_ptr<DriveFsBootstrapListener>
DriveFsHost::Delegate::CreateMojoListener() {
  return std::make_unique<DriveFsBootstrapListener>();
}

// A container of state tied to a particular mounting of DriveFS. None of this
// should be shared between mounts.
class DriveFsHost::MountState : public DriveFsSession,
                                public drive::DriveNotificationObserver {
 public:
  explicit MountState(DriveFsHost* host)
      : DriveFsSession(host->timer_.get(),
                       DiskMounter::Create(host->disk_mount_manager_),
                       CreateMojoConnection(host->account_token_delegate_.get(),
                                            host->delegate_),
                       host->GetDataPath(),
                       host->delegate_->GetMyFilesPath(),
                       host->GetDefaultMountDirName(),
                       host->mount_observer_),
        host_(host) {
    token_fetch_attempted_ =
        bool{host->account_token_delegate_->GetCachedAccessToken()};
    search_ = std::make_unique<DriveFsSearch>(
        drivefs_interface(), host_->network_connection_tracker_, host_->clock_);
  }

  ~MountState() override {
    DCHECK_CALLED_ON_VALID_SEQUENCE(host_->sequence_checker_);
    if (team_drives_fetched_) {
      host_->delegate_->GetDriveNotificationManager().RemoveObserver(this);
    }
    if (is_mounted()) {
      for (auto& observer : host_->observers_) {
        observer.OnUnmounted();
      }
    }
  }

  static std::unique_ptr<DriveFsConnection> CreateMojoConnection(
      DriveFsAuth* auth_delegate,
      DriveFsHost::Delegate* delegate) {
    auto access_token = auth_delegate->GetCachedAccessToken();
    mojom::DriveFsConfigurationPtr config = {
        base::in_place,
        auth_delegate->GetAccountId().GetUserEmail(),
        std::move(access_token),
        auth_delegate->IsMetricsCollectionEnabled(),
        delegate->GetLostAndFoundDirectoryName(),
        base::FeatureList::IsEnabled(chromeos::features::kDriveFsMirroring),
        delegate->IsVerboseLoggingEnabled()};
    return DriveFsConnection::Create(delegate->CreateMojoListener(),
                                     std::move(config));
  }

  mojom::QueryParameters::QuerySource SearchDriveFs(
      mojom::QueryParametersPtr query,
      mojom::SearchQuery::GetNextPageCallback callback) {
    return search_->PerformSearch(std::move(query), std::move(callback));
  }

 private:
  // mojom::DriveFsDelegate:
  void GetAccessToken(const std::string& client_id,
                      const std::string& app_id,
                      const std::vector<std::string>& scopes,
                      GetAccessTokenCallback callback) override {
    DCHECK_CALLED_ON_VALID_SEQUENCE(host_->sequence_checker_);
    host_->account_token_delegate_->GetAccessToken(!token_fetch_attempted_,
                                                   std::move(callback));
    token_fetch_attempted_ = true;
  }

  void OnSyncingStatusUpdate(mojom::SyncingStatusPtr status) override {
    for (auto& observer : host_->observers_) {
      observer.OnSyncingStatusUpdate(*status);
    }
  }

  void OnFilesChanged(std::vector<mojom::FileChangePtr> changes) override {
    std::vector<mojom::FileChange> changes_values;
    changes_values.reserve(changes.size());
    for (auto& change : changes) {
      changes_values.emplace_back(std::move(*change));
    }
    for (auto& observer : host_->observers_) {
      observer.OnFilesChanged(changes_values);
    }
  }

  void OnError(mojom::DriveErrorPtr error) override {
    if (!IsKnownEnumValue(error->type)) {
      return;
    }
    for (auto& observer : host_->observers_) {
      observer.OnError(*error);
    }
  }

  void OnTeamDrivesListReady(
      const std::vector<std::string>& team_drive_ids) override {
    host_->delegate_->GetDriveNotificationManager().AddObserver(this);
    host_->delegate_->GetDriveNotificationManager().UpdateTeamDriveIds(
        std::set<std::string>(team_drive_ids.begin(), team_drive_ids.end()),
        {});
    team_drives_fetched_ = true;
  }

  void OnTeamDriveChanged(const std::string& team_drive_id,
                          CreateOrDelete change_type) override {
    if (!team_drives_fetched_) {
      return;
    }
    std::set<std::string> additions;
    std::set<std::string> removals;
    if (change_type == mojom::DriveFsDelegate::CreateOrDelete::kCreated) {
      additions.insert(team_drive_id);
    } else {
      removals.insert(team_drive_id);
    }
    host_->delegate_->GetDriveNotificationManager().UpdateTeamDriveIds(
        additions, removals);
  }

  // DriveNotificationObserver overrides:
  void OnNotificationReceived(
      const std::map<std::string, int64_t>& invalidations) override {
    std::vector<mojom::FetchChangeLogOptionsPtr> options;
    options.reserve(invalidations.size());
    for (const auto& invalidation : invalidations) {
      options.emplace_back(base::in_place, invalidation.second,
                           invalidation.first);
    }
    drivefs_interface()->FetchChangeLog(std::move(options));
  }

  void OnNotificationTimerFired() override {
    drivefs_interface()->FetchAllChangeLogs();
  }

  // Owns |this|.
  DriveFsHost* const host_;

  std::unique_ptr<DriveFsSearch> search_;

  bool token_fetch_attempted_ = false;
  bool team_drives_fetched_ = false;

  DISALLOW_COPY_AND_ASSIGN(MountState);
};

DriveFsHost::DriveFsHost(
    const base::FilePath& profile_path,
    DriveFsHost::Delegate* delegate,
    DriveFsHost::MountObserver* mount_observer,
    network::NetworkConnectionTracker* network_connection_tracker,
    const base::Clock* clock,
    chromeos::disks::DiskMountManager* disk_mount_manager,
    std::unique_ptr<base::OneShotTimer> timer)
    : profile_path_(profile_path),
      delegate_(delegate),
      mount_observer_(mount_observer),
      network_connection_tracker_(network_connection_tracker),
      clock_(clock),
      disk_mount_manager_(disk_mount_manager),
      timer_(std::move(timer)),
      account_token_delegate_(
          std::make_unique<DriveFsAuth>(clock,
                                        profile_path,
                                        std::make_unique<base::OneShotTimer>(),
                                        delegate)) {
  DCHECK(delegate_);
  DCHECK(mount_observer_);
  DCHECK(network_connection_tracker_);
  DCHECK(clock_);
}

DriveFsHost::~DriveFsHost() {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}

void DriveFsHost::AddObserver(DriveFsHostObserver* observer) {
  observers_.AddObserver(observer);
}

void DriveFsHost::RemoveObserver(DriveFsHostObserver* observer) {
  observers_.RemoveObserver(observer);
}

bool DriveFsHost::Mount() {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  const AccountId& account_id = delegate_->GetAccountId();
  if (mount_state_ || !account_id.HasAccountIdKey() ||
      account_id.GetUserEmail().empty()) {
    return false;
  }
  mount_state_ = std::make_unique<MountState>(this);
  return true;
}

void DriveFsHost::Unmount() {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  mount_state_.reset();
}

bool DriveFsHost::IsMounted() const {
  return mount_state_ && mount_state_->is_mounted();
}

base::FilePath DriveFsHost::GetMountPath() const {
  return mount_state_ && mount_state_->is_mounted()
             ? mount_state_->mount_path()
             : base::FilePath("/media/fuse").Append(GetDefaultMountDirName());
}

base::FilePath DriveFsHost::GetDataPath() const {
  return profile_path_.Append(kDataPath).Append(
      delegate_->GetObfuscatedAccountId());
}

mojom::DriveFs* DriveFsHost::GetDriveFsInterface() const {
  if (!mount_state_ || !mount_state_->is_mounted()) {
    return nullptr;
  }
  return mount_state_->drivefs_interface();
}

mojom::QueryParameters::QuerySource DriveFsHost::PerformSearch(
    mojom::QueryParametersPtr query,
    mojom::SearchQuery::GetNextPageCallback callback) {
  if (!mount_state_ || !mount_state_->is_mounted()) {
    std::move(callback).Run(drive::FileError::FILE_ERROR_SERVICE_UNAVAILABLE,
                            {});
    return mojom::QueryParameters::QuerySource::kLocalOnly;
  }
  return mount_state_->SearchDriveFs(std::move(query), std::move(callback));
}

std::string DriveFsHost::GetDefaultMountDirName() const {
  return base::StrCat({"drivefs-", delegate_->GetObfuscatedAccountId()});
}

}  // namespace drivefs