Source/WebDriver/socket/HTTPParser.h

/*
 * Copyright (C) 2020 Sony Interactive Entertainment Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <wtf/Vector.h>
#include <wtf/text/WTFString.h>

namespace WebDriver {

class HTTPParser {
public:
    struct Message {
        String path;
        String method;
        String version;
        Vector<String> requestHeaders;
        Vector<uint8_t> requestBody;
    };

    enum class Phase {
        Idle,
        Header,
        Body,
        Complete,
        Error,
    };

    enum class Process {
        Suspend,
        Continue,
    };

    Phase parse(Vector<uint8_t>&&);
    Message pullMessage() { return m_message; }

private:
    Process handlePhase();
    Process abortProcess(const char* message = nullptr);
    bool parseFirstLine(String&& line);
    bool readLine(String& line);
    size_t expectedBodyLength() const;

    Phase m_phase { Phase::Idle };
    Message m_message;
    size_t m_bodyLength { 0 };

    Vector<uint8_t> m_buffer;
};

} // namespace WebDriver