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// Copyright 2024 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_TEST_EMBEDDED_TEST_SERVER_WEBSOCKET_MESSAGE_ASSEMBLER_H_
#define NET_TEST_EMBEDDED_TEST_SERVER_WEBSOCKET_MESSAGE_ASSEMBLER_H_
#include <string_view>
#include <vector>
#include "base/containers/span.h"
#include "base/memory/raw_span.h"
#include "base/types/expected.h"
#include "net/base/net_errors.h"
#include "net/websockets/websocket_frame.h"
namespace net::test_server {
struct Message {
bool is_text_message;
// `body` either points into the `payload` passed to `HandleFrame()` or into
// storage owned by the WebSocketMessageAssembler object. It will be
// invalidated by the next call to `HandleFrame()`.
base::raw_span<const uint8_t> body;
};
using MessageOrError = base::expected<Message, net::Error>;
class WebSocketMessageAssembler final {
public:
WebSocketMessageAssembler();
~WebSocketMessageAssembler();
// Handles incoming WebSocket frames and assembles messages.
// If `final` is true and the message is complete, it returns a `Message`.
// If more frames are expected, it returns `ERR_IO_PENDING`.
// Possible errors are `ERR_IO_PENDING` and `ERR_WS_PROTOCOL_ERROR`.
// Note: Validation of text messages as UTF-8 is the responsibility of the
// client.
MessageOrError HandleFrame(bool final,
WebSocketFrameHeader::OpCode opcode,
base::span<const char> payload);
// Resets internal state when a message is fully processed or in case of
// errors.
void Reset();
private:
// Buffer to hold partial frames for multi-frame messages.
std::vector<uint8_t> multi_frame_buffer_;
// State to track if we are expecting a continuation frame.
enum class MessageState {
// kIdle: No message is being processed.
kIdle,
kExpectTextContinuation,
kExpectBinaryContinuation,
kFinished
} state_ = MessageState::kIdle;
bool is_text_message_ = false;
};
} // namespace net::test_server
#endif // NET_TEST_EMBEDDED_TEST_SERVER_WEBSOCKET_MESSAGE_ASSEMBLER_H_
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