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#pragma once 
 
#include <library/cpp/monlib/encode/format.h>
 
#include <util/string/ascii.h> 
#include <util/generic/yexception.h> 
#include <util/generic/typetraits.h> 
 
namespace NMonitoring { 
    namespace NPrivate { 
        Y_HAS_MEMBER(Name, Name); 
        Y_HAS_MEMBER(second, Second); 
    } // namespace NPrivate 
 
    template <typename TRequest> 
    ECompression ParseCompression(const TRequest& req) { 
        auto&& headers = req.GetHeaders(); 
 
        constexpr auto isPlainPair = NPrivate::THasSecond<std::decay_t<decltype(*headers.begin())>>::value; 
 
        auto it = FindIf(std::begin(headers), std::end(headers), 
            [=] (const auto& h) {
                if constexpr (NPrivate::THasName<std::decay_t<decltype(h)>>::value) { 
                    return AsciiCompareIgnoreCase(h.Name(), TStringBuf("accept-encoding")) == 0;
                } else if (isPlainPair) { 
                    return AsciiCompareIgnoreCase(h.first, TStringBuf("accept-encoding")) == 0;
                } 
            }); 
 
        if (it == std::end(headers)) { 
            return NMonitoring::ECompression::IDENTITY; 
        } 
 
        NMonitoring::ECompression val{}; 
        if constexpr (isPlainPair) { 
            val = CompressionFromAcceptEncodingHeader(it->second); 
        } else { 
            val = CompressionFromAcceptEncodingHeader(it->Value()); 
        } 
 
        return val != NMonitoring::ECompression::UNKNOWN 
            ? val 
            : NMonitoring::ECompression::IDENTITY; 
    } 
 
    template <typename TRequest> 
    NMonitoring::EFormat ParseFormat(const TRequest& req) { 
        auto&& formatStr = req.GetParams() 
            .Get(TStringBuf("format"));
 
        if (!formatStr.empty()) {
            if (formatStr == TStringBuf("SPACK")) {
                return EFormat::SPACK; 
            } else if (formatStr == TStringBuf("TEXT")) {
                return EFormat::TEXT; 
            } else if (formatStr == TStringBuf("JSON")) {
                return EFormat::JSON; 
            } else { 
                ythrow yexception() << "unknown format: " << formatStr << ". Only spack is supported here"; 
            } 
        } 
 
        auto&& headers = req.GetHeaders(); 
        constexpr auto isPlainPair = NPrivate::THasSecond<std::decay_t<decltype(*headers.begin())>>::value; 
 
        auto it = FindIf(std::begin(headers), std::end(headers), 
            [=] (const auto& h) {
                if constexpr (NPrivate::THasName<std::decay_t<decltype(h)>>::value) { 
                    return AsciiCompareIgnoreCase(h.Name(), TStringBuf("accept")) == 0;
                } else if (isPlainPair) { 
                    return AsciiCompareIgnoreCase(h.first, TStringBuf("accept")) == 0;
                } 
            }); 
 
        if (it != std::end(headers)) { 
            if constexpr (isPlainPair) { 
                return FormatFromAcceptHeader(it->second); 
            } else { 
                return FormatFromAcceptHeader(it->Value()); 
            } 
        } 
 
        return EFormat::UNKNOWN; 
    } 
 
} // namespace NMonitoring