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// Copyright 2014 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 <stdint.h>
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/threading/thread_checker.h"
#include "url/gurl.h"
namespace client_update_protocol {
class Ecdsa;
namespace network {
class SimpleURLLoader;
namespace update_client {
class Configurator;
// Sends a request to one of the urls provided. The class implements a chain
// of responsibility design pattern, where the urls are tried in the order they
// are specified, until the request to one of them succeeds or all have failed.
// CUP signing is optional.
class RequestSender {
// If |error| is 0, then the response is provided in the |response| parameter.
// |retry_after_sec| contains the value of the X-Retry-After response header,
// when the response was received from a cryptographically secure URL. The
// range for this value is [-1, 86400]. If |retry_after_sec| is -1 it means
// that the header could not be found, or trusted, or had an invalid value.
// The upper bound represents a delay of one day.
using RequestSenderCallback = base::OnceCallback<
void(int error, const std::string& response, int retry_after_sec)>;
explicit RequestSender(scoped_refptr<Configurator> config);
// |use_signing| enables CUP signing of protocol messages exchanged using
// this class. |is_foreground| controls the presence and the value for the
// X-GoogleUpdate-Interactvity header serialized in the protocol request.
// If this optional parameter is set, the values of "fg" or "bg" are sent
// for true or false values of this parameter. Otherwise the header is not
// sent at all.
void Send(const std::vector<GURL>& urls,
const std::map<std::string, std::string>& request_extra_headers,
const std::string& request_body,
bool use_signing,
RequestSenderCallback request_sender_callback);
// Combines the |url| and |query_params| parameters.
static GURL BuildUpdateUrl(const GURL& url, const std::string& query_params);
// Decodes and returns the public key used by CUP.
static std::string GetKey(const char* key_bytes_base64);
// Returns the string value of a header of the server response or an empty
// string if the header is not available.
static std::string GetStringHeaderValue(
const network::SimpleURLLoader* url_loader,
const char* header_name);
// Returns the integral value of a header of the server response or -1 if
// if the header is not available or a conversion error has occured.
static int64_t GetInt64HeaderValue(const network::SimpleURLLoader* loader,
const char* header_name);
void OnSimpleURLLoaderComplete(const GURL& original_url,
std::unique_ptr<std::string> response_body);
// Implements the error handling and url fallback mechanism.
void SendInternal();
// Called when SendInternal completes. |response_body| and |response_etag|
// contain the body and the etag associated with the HTTP response.
void SendInternalComplete(int error,
const std::string& response_body,
const std::string& response_etag,
int retry_after_sec);
// Helper function to handle a non-continuable error in Send.
void HandleSendError(int error, int retry_after_sec);
base::ThreadChecker thread_checker_;
const scoped_refptr<Configurator> config_;
std::vector<GURL> urls_;
std::map<std::string, std::string> request_extra_headers_;
std::string request_body_;
bool use_signing_; // True if CUP signing is used.
RequestSenderCallback request_sender_callback_;
std::string public_key_;
std::vector<GURL>::const_iterator cur_url_;
std::unique_ptr<network::SimpleURLLoader> url_loader_;
std::unique_ptr<client_update_protocol::Ecdsa> signer_;
} // namespace update_client