HTTP2MimeRequestEncoder.h

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/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *     http://aws.amazon.com/apache2.0/
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

#ifndef ALEXA_CLIENT_SDK_AVSCOMMON_UTILS_INCLUDE_AVSCOMMON_UTILS_HTTP2_HTTP2MIMEREQUESTENCODER_H_
#define ALEXA_CLIENT_SDK_AVSCOMMON_UTILS_INCLUDE_AVSCOMMON_UTILS_HTTP2_HTTP2MIMEREQUESTENCODER_H_

#include <memory>
#include <ostream>
#include <string>
#include <vector>

#include "AVSCommon/Utils/HTTP2/HTTP2MimeRequestSourceInterface.h"
#include "AVSCommon/Utils/HTTP2/HTTP2RequestSourceInterface.h"

namespace alexaClientSDK {
namespace avsCommon {
namespace utils {
namespace http2 {

class HTTP2MimeRequestEncoder : public HTTP2RequestSourceInterface {
public:
    HTTP2MimeRequestEncoder(const std::string& boundary, std::shared_ptr<HTTP2MimeRequestSourceInterface> source);

    ~HTTP2MimeRequestEncoder() = default;

    HTTP2SendDataResult onSendData(char* bytes, size_t size) override;
    std::vector<std::string> getRequestHeaderLines() override;

private:
    enum class State {
        NEW,
        GETTING_1ST_PART_HEADERS,
        SENDING_1ST_BOUNDARY,
        SENDING_PART_HEADERS,
        SENDING_PART_DATA,
        SENDING_END_BOUNDARY,
        GETTING_NTH_PART_HEADERS,
        SENDING_CRLF_AFTER_BOUNDARY,
        SENDING_TERMINATING_DASHES,
        DONE,
        ABORT
    };

    // Friend operator<<() to enable debug output.
    friend std::ostream& operator<<(std::ostream& stream, State state);

    void setState(State newState);

    bool sendString(char* bytes, size_t size, const std::string& text);

    bool sendStringAndCRLF(char* bytes, size_t size, const std::string& text);

    HTTP2SendDataResult continueResult();

    State m_state;

    std::string m_rawBoundary;

    std::string m_prefixedBoundary;

    std::shared_ptr<HTTP2MimeRequestSourceInterface> m_source;

    size_t m_bytesCopied;

    HTTP2GetMimeHeadersResult m_getMimeHeaderLinesResult;

    std::vector<std::string>::const_iterator m_headerLine;

    size_t m_stringIndex;
};

}  // namespace http2
}  // namespace utils
}  // namespace avsCommon
}  // namespace alexaClientSDK

#endif  // ALEXA_CLIENT_SDK_AVSCOMMON_UTILS_INCLUDE_AVSCOMMON_UTILS_HTTP2_HTTP2MIMEREQUESTENCODER_H_