base/fuchsia/filtered_service_directory.h

// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_FUCHSIA_FILTERED_SERVICE_DIRECTORY_H_
#define BASE_FUCHSIA_FILTERED_SERVICE_DIRECTORY_H_

#include <fuchsia/io/cpp/fidl.h>
#include <lib/fidl/cpp/interface_handle.h>
#include <lib/sys/cpp/outgoing_directory.h>
#include <lib/sys/cpp/service_directory.h>
#include <lib/zx/channel.h>

#include <memory>
#include <string_view>

#include "base/base_export.h"

namespace base {

// ServiceDirectory that uses the supplied sys::ServiceDirectory to satisfy
// requests for only a restricted set of services.
class BASE_EXPORT FilteredServiceDirectory {
 public:
  // Creates a directory that proxies requests to the specified service
  // |directory|.
  explicit FilteredServiceDirectory(
      std::shared_ptr<sys::ServiceDirectory> directory);

  FilteredServiceDirectory(const FilteredServiceDirectory&) = delete;
  FilteredServiceDirectory& operator=(const FilteredServiceDirectory&) = delete;

  ~FilteredServiceDirectory();

  // Adds the specified service to the list of allowed services.
  // Returns a status other than ZX_OK if the service cannot be added, e.g.
  // because it is already in the list of allowed services.
  [[nodiscard]] zx_status_t AddService(std::string_view service_name);

  // Connects a directory client. The directory can be passed to a sandboxed
  // process to be used for /svc namespace.
  [[nodiscard]] zx_status_t ConnectClient(
      fidl::InterfaceRequest<::fuchsia::io::Directory> dir_request);

  // Accessor for the OutgoingDirectory, used to add handlers for services
  // in addition to those provided from |directory| via AddService().
  sys::OutgoingDirectory* outgoing_directory() { return &outgoing_directory_; }

 private:
  const std::shared_ptr<sys::ServiceDirectory> directory_;
  sys::OutgoingDirectory outgoing_directory_;
};

}  // namespace base

#endif  // BASE_FUCHSIA_FILTERED_SERVICE_DIRECTORY_H_