.net core 在代码中使用jwt token中的用户信息

    基本思路，在过滤器中将token中的用户信息存放到context.HttpContext.User或者Thread.CurrentPrincipal中。使用时通过扩展方法或者静态方法获取用户信息。

存放到context.HttpContext.User中

services.AddHttpContextAccessor();

 public class TokenActionFilter1: ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext context)
        {
            var test = context.HttpContext.Request.Path;
            string bearer = context.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(tokenObj.Claims);
            var claimsPrincipal = new ClaimsPrincipal(claimsIdentity);
            context.HttpContext.User = claimsPrincipal;
        }
    }

      public static int GetUserId(this ClaimsPrincipal claimsPrincipal)
        {
            try
            {
                var claim = claimsPrincipal?.Claims.FirstOrDefault(c => c.Type == "UserId");
                if (claim == null || string.IsNullOrEmpty(claim.Value))
                {
                    return 0;
                }

                return int.Parse(claim.Value);
            }
            catch
            {
                return 0;
            }
        }

        //_httpContextAccessor为IHttpContextAccessor通过构造函数注入
        [HttpGet("get1")]
        [TokenActionFilter1]
        public async Task<int> Get1()
        {
            var id = _httpContextAccessor.HttpContext.User.GetUserId();
            return id;
        }

存放到Thread.CurrentPrincipal中

public class TokenActionFilter2 : ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext context)
        {
            var test = context.HttpContext.Request.Path;
            string bearer = context.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;
        }
    }

     public static int GetUserId()
       {
           try
           {
               var claimsPrincipal = Thread.CurrentPrincipal as ClaimsPrincipal;
               var claim = claimsPrincipal?.Claims.FirstOrDefault(c => c.Type == "UserId");
               if (claim == null || string.IsNullOrEmpty(claim.Value))
               {
                   return 0;
               }
               return int.Parse(claim.Value);
           }
           catch
           {
               return 0;
           }
       }

    [HttpGet]
    [TokenActionFilter2]
    public async Task<int> Get2()
    {
        var id = TokenExtension2.GetUserId();
        return id;
    }