content/browser/web_package/web_package_prefetch_handler.h

// 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.

#ifndef CONTENT_BROWSER_WEB_PACKAGE_WEB_PACKAGE_PREFETCH_HANDLER_H_
#define CONTENT_BROWSER_WEB_PACKAGE_WEB_PACKAGE_PREFETCH_HANDLER_H_

#include "base/macros.h"
#include "mojo/public/cpp/bindings/binding.h"
#include "services/network/public/mojom/url_loader.mojom.h"

namespace net {
class URLRequestContextGetter;
}

namespace network {
class SharedURLLoaderFactory;
}

namespace content {

class ResourceContext;
class URLLoaderThrottle;
class WebPackageLoader;

// Attached to each PrefetchURLLoader if the prefetch is for a signed exchange.
class WebPackagePrefetchHandler final : public network::mojom::URLLoaderClient {
 public:
  using URLLoaderThrottlesGetter = base::RepeatingCallback<
      std::vector<std::unique_ptr<content::URLLoaderThrottle>>()>;

  static bool IsResponseForWebPackage(
      const network::ResourceResponseHead& response);

  // This takes |network_loader| and |network_client| to set up the
  // WebPackageLoader (so that the loader can load data from the network).
  // |forwarding_client| is a pointer to the downstream client (typically who
  // creates this handler).
  WebPackagePrefetchHandler(
      const network::ResourceResponseHead& response,
      network::mojom::URLLoaderPtr network_loader,
      network::mojom::URLLoaderClientRequest network_client_request,
      scoped_refptr<network::SharedURLLoaderFactory> network_loader_factory,
      url::Origin request_initiator,
      URLLoaderThrottlesGetter loader_throttles_getter,
      ResourceContext* resource_context,
      scoped_refptr<net::URLRequestContextGetter> request_context_getter,
      network::mojom::URLLoaderClient* forwarding_client);

  ~WebPackagePrefetchHandler() override;

  // This connects |loader_request| to the WebPackageLoader, and returns the
  // pending client request to the loader.
  // The returned client request can be bound to the downstream client so that
  // they can start directly receiving upcalls from the WebPackageLoader.
  // After this point |this| can be destructed.
  network::mojom::URLLoaderClientRequest FollowRedirect(
      network::mojom::URLLoaderRequest loader_request);

 private:
  // network::mojom::URLLoaderClient overrides:
  void OnReceiveResponse(
      const network::ResourceResponseHead& head,
      const base::Optional<net::SSLInfo>& ssl_info,
      network::mojom::DownloadedTempFilePtr downloaded_file) override;
  void OnReceiveRedirect(const net::RedirectInfo& redirect_info,
                         const network::ResourceResponseHead& head) override;
  void OnDataDownloaded(int64_t data_length, int64_t encoded_length) override;
  void OnUploadProgress(int64_t current_position,
                        int64_t total_size,
                        base::OnceCallback<void()> callback) override;
  void OnReceiveCachedMetadata(const std::vector<uint8_t>& data) override;
  void OnTransferSizeUpdated(int32_t transfer_size_diff) override;
  void OnStartLoadingResponseBody(
      mojo::ScopedDataPipeConsumerHandle body) override;
  void OnComplete(const network::URLLoaderCompletionStatus& status) override;

  mojo::Binding<network::mojom::URLLoaderClient> loader_client_binding_;

  std::unique_ptr<WebPackageLoader> web_package_loader_;

  network::mojom::URLLoaderClient* forwarding_client_;

  DISALLOW_COPY_AND_ASSIGN(WebPackagePrefetchHandler);
};

}  // namespace content

#endif  // CONTENT_BROWSER_WEB_PACKAGE_WEB_PACKAGE_PREFETCH_HANDLER_H_