PlainTextProtocolOptions.cs

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using System.Text;
using System.Threading;
 
namespace Dreamine.Communication.Core.Protocols;

public sealed class PlainTextProtocolOptions
{
    public const string Utf8EncodingName = "UTF-8";

    public const string KoreanCodePage949EncodingName = "CP949";

    private static int _isCodePageProviderRegistered;

    public Encoding Encoding { get; init; } = CreateEncoding(Utf8EncodingName);

    public string Route { get; init; } = "external.text";

    public string Name { get; init; } = "External.Text";

    public bool NormalizePayloadToUtf8 { get; init; } = true;

    public static Encoding CreateEncoding(string? encodingName)
    {
        if (string.IsNullOrWhiteSpace(encodingName))
        {
            return new UTF8Encoding(false, true);
        }
 
        if (string.Equals(encodingName, Utf8EncodingName, StringComparison.OrdinalIgnoreCase) ||
            string.Equals(encodingName, "UTF8", StringComparison.OrdinalIgnoreCase))
        {
            return new UTF8Encoding(false, true);
        }
 
        if (string.Equals(encodingName, KoreanCodePage949EncodingName, StringComparison.OrdinalIgnoreCase) ||
            string.Equals(encodingName, "949", StringComparison.OrdinalIgnoreCase) ||
            string.Equals(encodingName, "ks_c_5601-1987", StringComparison.OrdinalIgnoreCase))
        {
            EnsureCodePageProviderRegistered();
            return Encoding.GetEncoding(949);
        }
 
        EnsureCodePageProviderRegistered();
        return Encoding.GetEncoding(encodingName);
    }

    private static void EnsureCodePageProviderRegistered()
    {
        if (Interlocked.Exchange(ref _isCodePageProviderRegistered, 1) == 1)
        {
            return;
        }
 
        Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
    }
}