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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_SERVER_WEB_SOCKET_ENCODER_H_
#define NET_SERVER_WEB_SOCKET_ENCODER_H_
#include <memory>
#include <string>
#include <string_view>
#include <vector>
#include "net/server/web_socket.h"
#include "net/websockets/websocket_deflater.h"
#include "net/websockets/websocket_inflater.h"
namespace net {
class WebSocketDeflateParameters;
class WebSocketEncoder final {
public:
static const char kClientExtensions[];
WebSocketEncoder(const WebSocketEncoder&) = delete;
WebSocketEncoder& operator=(const WebSocketEncoder&) = delete;
~WebSocketEncoder();
// Creates and returns an encoder for a server without extensions.
static std::unique_ptr<WebSocketEncoder> CreateServer();
// Creates and returns an encoder.
// |extensions| is the value of a Sec-WebSocket-Extensions header.
// Returns nullptr when there is an error.
static std::unique_ptr<WebSocketEncoder> CreateServer(
const std::string& extensions,
WebSocketDeflateParameters* params);
static std::unique_ptr<WebSocketEncoder> CreateClient(
const std::string& response_extensions);
WebSocket::ParseResult DecodeFrame(std::string_view frame,
int* bytes_consumed,
std::string* output);
void EncodeTextFrame(std::string_view frame,
int masking_key,
std::string* output);
void EncodePongFrame(std::string_view frame,
int masking_key,
std::string* output);
void EncodeCloseFrame(std::string_view frame,
int masking_key,
std::string* output);
bool deflate_enabled() const { return !!deflater_; }
private:
enum Type {
FOR_SERVER,
FOR_CLIENT,
};
WebSocketEncoder(Type type,
std::unique_ptr<WebSocketDeflater> deflater,
std::unique_ptr<WebSocketInflater> inflater);
std::vector<std::string> continuation_message_frames_;
bool is_current_message_compressed_ = false;
bool Inflate(std::string* message);
bool Deflate(std::string_view message, std::string* output);
Type type_;
std::unique_ptr<WebSocketDeflater> deflater_;
std::unique_ptr<WebSocketInflater> inflater_;
};
} // namespace net
#endif // NET_SERVER_WEB_SOCKET_ENCODER_H_