20 lines
666 B
C#
20 lines
666 B
C#
 
|
using System.Buffers.Binary;
|
||
|
|
using System.Security.Cryptography;
|
||
|
|
|
||
|
|
namespace PrivaPub.Infrastructure.Ids
|
||
|
|
{
|
||
|
|
public static class PrivacyIds
|
||
|
|
{
|
||
|
|
public static string ForDay(DateTime when) => At(DateTime.SpecifyKind(when, DateTimeKind.Utc).Date);
|
||
|
|
|
||
|
|
public static string At(DateTime when)
|
||
|
|
{
|
||
|
|
var seconds = Math.Clamp(new DateTimeOffset(DateTime.SpecifyKind(when, DateTimeKind.Utc)).ToUnixTimeSeconds(), 0,
|
||
|
|
DateTimeOffset.UtcNow.AddDays(1).ToUnixTimeSeconds());
|
||
|
|
Span<byte> bytes = stackalloc byte[12];
|
||
|
|
BinaryPrimitives.WriteInt32BigEndian(bytes, (int)seconds);
|
||
|
|
RandomNumberGenerator.Fill(bytes[4..]);
|
||
|
|
return Convert.ToHexStringLower(bytes);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|