public override void OnActionExecuting(ActionExecutingContext context)
{
var seed = _cache.GetSeed();
var privateAddress = typeof(IPAddress)
.GetProperty("PrivateAddress", BindingFlags.Instance | BindingFlags.NonPublic)?
.GetValue(context.HttpContext.Connection.RemoteIpAddress);
if (privateAddress != default)
{
unsafe
{
var address = (uint)privateAddress;
var addressBytes = stackalloc byte[4];
addressBytes[0] = (byte)address;
addressBytes[1] = (byte)(address >> 8);
addressBytes[2] = (byte)(address >> 16);
addressBytes[3] = (byte)(address >> 24);
var hash = BitConverter.GetBytes(WyHash64.ComputeHash64(new ReadOnlySpan <byte>(addressBytes, 4),
seed));
context.ActionArguments["addressHash"] = hash;
}
}
else
{
privateAddress = typeof(IPAddress).GetField("_numbers", BindingFlags.Instance | BindingFlags.NonPublic)?
.GetValue(context.HttpContext.Connection.RemoteIpAddress);
if (privateAddress != default)
{
unsafe
{
var address = (ushort[])privateAddress;
var addressBytes = stackalloc byte[16];
var j = 0;
for (var i = 0; i < 8; i++)
{
addressBytes[j++] = (byte)((address[i] >> 8) & 0xFF);
addressBytes[j++] = (byte)(address[i] & 0xFF);
}
var hash = BitConverter.GetBytes(
WyHash64.ComputeHash64(new ReadOnlySpan <byte>(addressBytes, 16), seed));
context.ActionArguments["addressHash"] = hash;
}
}
}
base.OnActionExecuting(context);
}
public static string StrongETag <TRegion>(this byte[] data, ICacheRegion <TRegion> cache)
{
var value = WyHash64.ComputeHash64(data, cache.GetSeed());
return($"\"{value}\"");
}
public static string WeakETag <TRegion>(this string key, bool prefix, ICacheRegion <TRegion> cache)
{
var value = WyHash64.ComputeHash64(Encoding.UTF8.GetBytes(key), cache.GetSeed());
return(prefix ? $"W/\"{value}\"" : $"\"{value}\"");
}