.net core action过滤器的普通应用

.net core action过滤器的普通应用

.net core action过滤器有很多用途，比如特别是全局数据拦截操作。这里举两个例子。

1、使用ActionFilterAttribute全局过滤日志。

 /// <summary>
    /// 请求参数日志过滤器
    /// </summary>
    public class ParameterLogFilterAttribute : ActionFilterAttribute
    {
        /// <summary>
        /// 不需要记录日志的path
        /// </summary>
        List<string> paths = new List<string>() { "/api/Oauth/Login" };

        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            var path= filterContext.HttpContext.Request.Path;
            if (paths.Contains(path)) return;
            var type = filterContext.HttpContext.Request.Method;
            var str = filterContext.ActionArguments.ToJson();
            var ip = filterContext.HttpContext.Connection.RemoteIpAddress.MapToIPv4().ToString();
            LogHelper.WriteLog($"日志过滤器自动请求日志:【IP:{ip}】【请求方式：{type}】---->{path}---->{str}");
        }



        
        public override void OnActionExecuted(ActionExecutedContext context)
        {
            var path = context.HttpContext.Request.Path;
            var type = context.HttpContext.Request.Method;
            if (type.ToUpper() == "GET") return;
            var ip = context.HttpContext.Connection.RemoteIpAddress.MapToIPv4().ToString();
            var str = context.Result.ToJson();
            LogHelper.WriteLog($"日志过滤器自动结果日志:【IP:{ip}】【请求方式：{type}】---->{path}---->{str}");
        }



    }

2、全局自定义验证过滤器

  public class CentrizenTokenFilterAttribute : ActionFilterAttribute
    {




        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            var test = filterContext.HttpContext.Request.Path;
            string bearer = filterContext.HttpContext.Request.Headers["Authorization"].FirstOrDefault();
            if (string.IsNullOrEmpty(bearer)|| !bearer.Contains("Bearer")) return;
            string[] jwt = bearer.Split(' ');
            var tokenObj = new JwtSecurityToken(jwt[1]);

            var claimsIdentity = new ClaimsIdentity();
            claimsIdentity.AddClaims(tokenObj.Claims);
            var claimsPrincipal = new ClaimsPrincipal(claimsIdentity);
            Thread.CurrentPrincipal = claimsPrincipal;
            filterContext.HttpContext.User = claimsPrincipal;

           
        }




       

    }