// 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 SERVICES_NETWORK_PUBLIC_CPP_SINGLE_REQUEST_URL_LOADER_FACTORY_H_
#define SERVICES_NETWORK_PUBLIC_CPP_SINGLE_REQUEST_URL_LOADER_FACTORY_H_

#include "base/component_export.h"
#include "base/memory/scoped_refptr.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/receiver_set.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
#include "services/network/public/mojom/url_loader.mojom.h"

namespace network {

// An implementation of SharedURLLoaderFactory which handles only a single
// request. It's an error to call CreateLoaderAndStart() more than a total of
// one time across this object or any of its clones.
class COMPONENT_EXPORT(NETWORK_CPP) SingleRequestURLLoaderFactory
    : public network::SharedURLLoaderFactory {
 public:
  // Some arguments of `CreateLoaderAndStart()` are forwarded.
  using RequestHandler = base::OnceCallback<void(
      const network::ResourceRequest& resource_request,
      mojo::PendingReceiver<network::mojom::URLLoader>,
      mojo::PendingRemote<network::mojom::URLLoaderClient>)>;

  explicit SingleRequestURLLoaderFactory(RequestHandler handler);

  // All arguments of `CreateLoaderAndStart()` are forwarded.
  using FullRequestHandler = base::OnceCallback<void(
      mojo::PendingReceiver<mojom::URLLoader> loader,
      int32_t request_id,
      uint32_t options,
      const ResourceRequest& request,
      mojo::PendingRemote<mojom::URLLoaderClient> client,
      const net::MutableNetworkTrafficAnnotationTag& traffic_annotation)>;

  explicit SingleRequestURLLoaderFactory(FullRequestHandler full_handler);

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

  // SharedURLLoaderFactory:
  void CreateLoaderAndStart(
      mojo::PendingReceiver<network::mojom::URLLoader> loader,
      int32_t request_id,
      uint32_t options,
      const network::ResourceRequest& request,
      mojo::PendingRemote<network::mojom::URLLoaderClient> client,
      const net::MutableNetworkTrafficAnnotationTag& traffic_annotation)
      override;
  void Clone(mojo::PendingReceiver<network::mojom::URLLoaderFactory> receiver)
      override;
  std::unique_ptr<network::PendingSharedURLLoaderFactory> Clone() override;

 private:
  class PendingFactory;
  class HandlerState;

  explicit SingleRequestURLLoaderFactory(scoped_refptr<HandlerState> state);
  ~SingleRequestURLLoaderFactory() override;

  scoped_refptr<HandlerState> state_;

  mojo::ReceiverSet<network::mojom::URLLoaderFactory,
                    scoped_refptr<SingleRequestURLLoaderFactory>>
      receivers_;
};

}  // namespace network

#endif  // SERVICES_NETWORK_PUBLIC_CPP_SINGLE_REQUEST_URL_LOADER_FACTORY_H_