WebApi中添加Jwt鉴权 - 张拓的天空

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所属分类：.NET技术

摘要

JSON Web Token（JWT）是一个非常轻巧的规范。这个规范允许我们使用 JWT 在用户和服务器之间传递安全可靠的信息。一个 JWT 实际上就是一个字符串，它由三部分组成，头部、载荷与签名。前两部分需要经过 Base64 编码，后一部分通过前两部分 Base64 编码后再加密而成。针对前后端分离的项目，大多是通过 token 进行身份认证来进行交互，今天将介绍一种简单的创建和验证token 的方式。

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前言

WebApi中添加Jwt鉴权

项目介绍

项目框架：.NET Core 3.1

项目依赖：

Swashbuckle.AspNetCore
JWT

项目架构：

WebApi中添加Jwt鉴权

项目核心代码

JWT帮助类

  /// <summary>     /// JWT获取和验证帮助类     /// </summary>     public class JwtHelper     {         /// <summary>         /// 日志         /// </summary>        private static Logger  _logger = new Logger();          /// <summary>         /// 私钥appsettings.json中配置         /// </summary>         private static string secret =  ConfigHelper.GetSectionValue("TokenSecret");          /// <summary>         /// 生成JwtToken         /// </summary>         /// <param name="payload">不敏感的用户数据</param>         /// <returns></returns>         public static string SetJwtEncode(Dictionary<string, object> payload)         {             try             {                 IJwtAlgorithm algorithm = new HMACSHA256Algorithm();                 IJsonSerializer serializer = new JsonNetSerializer();                 IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();                 IJwtEncoder encoder = new JwtEncoder(algorithm, serializer, urlEncoder);                  var token = encoder.Encode(payload, secret);                 return token;             }             catch (System.Exception ex)             {                 _logger.Error(ex.Message);                 return null;             }          }          /// <summary>         /// 根据jwtToken获取实体         /// </summary>         /// <param name="token">jwtToken</param>         /// <returns></returns>         public static LoginUserInfo GetJwtDecode(string token)         {             try             {                 IJsonSerializer serializer = new JsonNetSerializer();                 IDateTimeProvider provider = new UtcDateTimeProvider();                 IJwtValidator validator = new JwtValidator(serializer, provider);                 IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();                 IJwtDecoder decoder = new JwtDecoder(serializer, urlEncoder);                 //IJwtDecoder decoder = new JwtDecoder(serializer, validator, urlEncoder);                 var userInfo = decoder.DecodeToObject<LoginUserInfo>(token, secret, verify: true);//token为之前生成的字符串                 return userInfo;             }             catch (System.Exception ex)             {                 _logger.Error(ex.Message);                 return null;             }          }      }

过滤器Filter

 /// <summary>     /// 授权认证     /// </summary>     public class AuthorizeFilter : Attribute, IActionFilter     {          public void OnActionExecuted(ActionExecutedContext context)         {          }          public void OnActionExecuting(ActionExecutingContext context)         {             var controller = context.RouteData.Values["controller"].ToString();             //var action = context.RouteData.Values["action"].ToString();             if (controller == "User" || controller == "Jwt")             {                 //登录接口不验证             }             else             {                 var authHeader = context.HttpContext.Request.Headers["Authorization"];                 if (string.IsNullOrWhiteSpace(authHeader))                 {                     //此接口必须携带token访问！                     context.Result = new JsonResult(new OperationResult(OperationResultType.Error, "此接口必须携带token访问，请登录携带Token访问"));                 }                 else //字段值不为空                 {                     authHeader = authHeader.ToString().Replace("Bearer", "").Trim();//去掉Bearer字串                     if (authHeader == "")                     {                         context.Result = new JsonResult(new OperationResult(OperationResultType.Error, "token验证失败：您没有权限调用此接口，请登录重新获取Token"));                     }                     else                     {                         LoginUserInfo LoginInfo = JwtHelper.GetJwtDecode(authHeader);                         if (LoginInfo != null)                         {                             context.Result = new JsonResult(new OperationResult(OperationResultType.Error, "Token验证失败"));                         }                         string UserName = LoginInfo.username;                         string PassWord = LoginInfo.pwd;                         string ExpireTimeStamp = LoginInfo.exp;                         //var cacheToken = Cache.Get(UserName);                         if (isTokenExpire(ExpireTimeStamp)) //这里应该验证有效期                         {                             context.Result = new JsonResult(new OperationResult(OperationResultType.Error, "token验证失败：您没有权限调用此接口，请登录重新获取Token"));                         }                     }                  }             }         }          /// <summary>         /// 时间戳字符串         /// </summary>         /// <param name="timestampstr"></param>         /// <returns></returns>         private bool isTokenExpire(string timestampstr)         {             try             {                 double timestamp = double.Parse(timestampstr);                 System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));//当地时区                 var expireTime = startTime.AddSeconds(timestamp);                 if (expireTime > DateTime.Now)                 {                     return false;//未过期                 }                 else                 {                     return true;//已过期                 }             }             catch (Exception ex)             {                 return true;             }         }      }