csharp-sdk-upm/Libs/Newtonsoft.Json.AOT/Converters/UnixDateTimeConverter.cs

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2021-03-31 11:22:02 +08:00
#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion
using System;
using System.Globalization;
using LC.Newtonsoft.Json.Utilities;
namespace LC.Newtonsoft.Json.Converters
{
/// <summary>
/// Converts a <see cref="DateTime"/> to and from Unix epoch time
/// </summary>
public class UnixDateTimeConverter : DateTimeConverterBase
{
internal static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
/// <summary>
/// Writes the JSON representation of the object.
/// </summary>
/// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>
/// <param name="value">The value.</param>
/// <param name="serializer">The calling serializer.</param>
public override void WriteJson(JsonWriter writer, object? value, JsonSerializer serializer)
{
long seconds;
if (value is DateTime dateTime)
{
seconds = (long)(dateTime.ToUniversalTime() - UnixEpoch).TotalSeconds;
}
#if HAVE_DATE_TIME_OFFSET
else if (value is DateTimeOffset dateTimeOffset)
{
seconds = (long)(dateTimeOffset.ToUniversalTime() - UnixEpoch).TotalSeconds;
}
#endif
else
{
throw new JsonSerializationException("Expected date object value.");
}
if (seconds < 0)
{
throw new JsonSerializationException("Cannot convert date value that is before Unix epoch of 00:00:00 UTC on 1 January 1970.");
}
writer.WriteValue(seconds);
}
/// <summary>
/// Reads the JSON representation of the object.
/// </summary>
/// <param name="reader">The <see cref="JsonReader"/> to read from.</param>
/// <param name="objectType">Type of the object.</param>
/// <param name="existingValue">The existing property value of the JSON that is being converted.</param>
/// <param name="serializer">The calling serializer.</param>
/// <returns>The object value.</returns>
public override object? ReadJson(JsonReader reader, Type objectType, object? existingValue, JsonSerializer serializer)
{
bool nullable = ReflectionUtils.IsNullable(objectType);
if (reader.TokenType == JsonToken.Null)
{
if (!nullable)
{
throw JsonSerializationException.Create(reader, "Cannot convert null value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
}
return null;
}
long seconds;
if (reader.TokenType == JsonToken.Integer)
{
seconds = (long)reader.Value!;
}
else if (reader.TokenType == JsonToken.String)
{
if (!long.TryParse((string)reader.Value!, out seconds))
{
throw JsonSerializationException.Create(reader, "Cannot convert invalid value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
}
}
else
{
throw JsonSerializationException.Create(reader, "Unexpected token parsing date. Expected Integer or String, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
}
if (seconds >= 0)
{
DateTime d = UnixEpoch.AddSeconds(seconds);
#if HAVE_DATE_TIME_OFFSET
Type t = (nullable)
? Nullable.GetUnderlyingType(objectType)
: objectType;
if (t == typeof(DateTimeOffset))
{
return new DateTimeOffset(d, TimeSpan.Zero);
}
#endif
return d;
}
else
{
throw JsonSerializationException.Create(reader, "Cannot convert value that is before Unix epoch of 00:00:00 UTC on 1 January 1970 to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
}
}
}
}