private bool CheckRequestHeader(IEtaggable data, CacheRequestHeaders header)
{
var headerName = header == CacheRequestHeaders.IfMatch ? "If-Match" : "If-None-Match";
var eTag = StringValues.Empty;
var headerHasValue = _headers.TryGetValue(headerName, out eTag);
var entityEtag = data.GetEtag(_hashAlgorithm);
switch (header)
{
case CacheRequestHeaders.IfMatch:
if (!headerHasValue)
{
return(false);
}
return(eTag.Contains(entityEtag, StringComparer.OrdinalIgnoreCase));
default:
if (!headerHasValue)
{
return(true);
}
return(!eTag.Contains(entityEtag, StringComparer.OrdinalIgnoreCase));
}
}
public bool NoneMatch(IEtaggable entity)
{
if (!_headers.TryGetValue("If-None-Match", out var etags))
{
return(true);
}
var entityEtag = entity.GetEtag();
if (string.IsNullOrEmpty(entityEtag))
{
return(true);
}
if (!entityEtag.Contains('"'))
{
entityEtag = $"\"{entityEtag}\"";
}
return(!etags.Contains(entityEtag));
}
public bool NoneMatch(IEtaggable data) => CheckRequestHeader(data, CacheRequestHeaders.IfNoneMatch);