/// <summary>
/// 基于默认的策略评估，检查给定操作上下文和可选消息的授权。
/// </summary>
/// <param name="operationContext">当前授权请求的 System.ServiceModel.OperationContext。</param>
/// <returns>如果授予访问权限，则为 true；否则为 false。 默认值为 true。</returns>
protected override bool CheckAccessCore(OperationContext operationContext)
{
MessageProperties properties = operationContext.IncomingMessageProperties;
var url = properties.Via.PathAndQuery;
//获取消息发送的远程终结点IP和端口
RemoteEndpointMessageProperty endpoint = properties[RemoteEndpointMessageProperty.Name] as RemoteEndpointMessageProperty;
logger.Log(LogLevel.Info, string.Format("用户：{0}:{1}访问服务,请求参数({2})！", endpoint.Address, endpoint.Port, url));
//MessageHeader<string> mh = new MessageHeader<string>("abcde");
//MessageHeader header = mh.GetUntypedHeader("Access-Control-Allow-Origin","*");
//OperationContext.Current.OutgoingMessageHeaders.Add(header);
return(SecurityHelper.Analysis(endpoint.Address));
}