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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_UPDATE_CLIENT_NETWORK_H_
#define COMPONENTS_UPDATE_CLIENT_NETWORK_H_
#include <stdint.h>
#include <memory>
#include <optional>
#include <string>
#include "base/containers/flat_map.h"
#include "base/functional/callback_forward.h"
#include "base/memory/ref_counted.h"
class GURL;
namespace base {
class FilePath;
} // namespace base
namespace update_client {
class NetworkFetcher {
public:
// If the request does not have an X-Retry-After header, implementations
// should pass -1 for |xheader_retry_after_sec|.
using PostRequestCompleteCallback =
base::OnceCallback<void(std::optional<std::string> response_body,
int net_error,
const std::string& header_etag,
const std::string& header_x_cup_server_proof,
const std::string& header_cookie,
int64_t xheader_retry_after_sec)>;
using DownloadToFileCompleteCallback =
base::OnceCallback<void(int net_error, int64_t content_size)>;
// `content_length` is -1 if the value is not known.
using ResponseStartedCallback =
base::RepeatingCallback<void(int response_code, int64_t content_length)>;
// `current` is the number of bytes received thus far.
using ProgressCallback = base::RepeatingCallback<void(int64_t current)>;
// The following two headers carry the ECSDA signature of the POST response,
// if signing has been used. Two headers are used for redundancy purposes.
// The value of the `X-Cup-Server-Proof` is preferred.
static constexpr char kHeaderEtag[] = "ETag";
static constexpr char kHeaderXCupServerProof[] = "X-Cup-Server-Proof";
// The server uses the optional X-Retry-After header to indicate that the
// current request should not be attempted again.
//
// The value of the header is the number of seconds to wait before trying to
// do a subsequent update check. Only the values retrieved over HTTPS are
// trusted.
static constexpr char kHeaderXRetryAfter[] = "X-Retry-After";
// The HTTP 'Cookie' header to pass through to the
// `PostRequestCompleteCallback`. This header isn't used by the Omaha update
// protocol but is necessary for other uses of `NetworkFetcher`.
static constexpr char kHeaderCookie[] = "Cookie";
NetworkFetcher(const NetworkFetcher&) = delete;
NetworkFetcher& operator=(const NetworkFetcher&) = delete;
virtual ~NetworkFetcher() = default;
virtual void PostRequest(
const GURL& url,
const std::string& post_data,
const std::string& content_type,
const base::flat_map<std::string, std::string>& post_additional_headers,
ResponseStartedCallback response_started_callback,
ProgressCallback progress_callback,
PostRequestCompleteCallback post_request_complete_callback) = 0;
// Returns a cancellation closure.
virtual base::OnceClosure DownloadToFile(
const GURL& url,
const base::FilePath& file_path,
ResponseStartedCallback response_started_callback,
ProgressCallback progress_callback,
DownloadToFileCompleteCallback download_to_file_complete_callback) = 0;
protected:
NetworkFetcher() = default;
};
class NetworkFetcherFactory
: public base::RefCountedThreadSafe<NetworkFetcherFactory> {
public:
virtual std::unique_ptr<NetworkFetcher> Create() const = 0;
NetworkFetcherFactory(const NetworkFetcherFactory&) = delete;
NetworkFetcherFactory& operator=(const NetworkFetcherFactory&) = delete;
protected:
friend class base::RefCountedThreadSafe<NetworkFetcherFactory>;
NetworkFetcherFactory() = default;
virtual ~NetworkFetcherFactory() = default;
};
} // namespace update_client
#endif // COMPONENTS_UPDATE_CLIENT_NETWORK_H_
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