public UserThumbnail Thumbnail()
{
Claim idClaim = User.FindFirst(ClaimTypes.NameIdentifier);
if (idClaim == null)
{
return(new UserThumbnail("/user-images/anonymous.png", "Anonymous"));
}
string id = idClaim.Value;
string username = User.FindFirst(ClaimTypes.Name).Value;
string userImageFilename = _userImageService.UserImageFilenameForUserId(id);
return(new UserThumbnail($"/user-images/{userImageFilename}", username));
}