一、引入Nuget包

生成Token和验证Token主要使用下面这个包。
Microsoft.AspNetCore.Authentication.JwtBearer


二、生成步骤
1.添加配置文件

在API项目的配置文件中增加关于Token的配置信息。
代码如下：

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "JwtSettings": {
    "Issuer": "https://localhost:7141", //颁发者
    "Audience": "https://localhost:7141", //使用者
    "SecrentKey": "fdsfdsfdfdsfdsfsdfdfsdf", //秘钥
    "Expirces": 3600, //Token过期时间，
    "RefreshTokenExpirces": 3600 //refresh_Token过期时间
  }
}

---

---

需要注意的是SecrentKey 的值必须大于16位，不然在生成Token时会报错。
2.创建对应的实体

我们先创建一个和配置文件中相对应的实体，命名为JwtSettings。
代码如下：

namespace JwtDemo
{
    /// <summary>
    /// JWT 配置信息
    /// </summary>
    public class JwtSettings
    {
        /// <summary>
        /// 颁发者
        /// </summary>
        public string Issuer { get; set; }

        /// <summary>
        /// 使用者
        /// </summary>
        public string Audience { get; set; }

        /// <summary>
        /// 私钥
        /// </summary>
        public string SecrentKey { get; set; }

        /// <summary>
        /// Token过期时间 单位秒
        /// </summary>
        public int Expirces { get; set; }

        /// <summary>
        /// Refresh_Token过期时间 单位秒
        /// </summary>
        public int RefreshTokenExpirces { get; set; }
    }
}

---

---

创建一个用于返回Token的实体，命名为 ResponseToken

namespace JwtDemo
{
    /// <summary>
    /// Token的返回实体
    /// </summary>
    public class ResponseToken
    {

        /// <summary>
        /// JWT Token
        /// </summary>
        public string Token { get; set; }

        /// <summary>
        /// 用于刷新token的刷新令牌
        /// </summary>
        public string Refresh_Token { get; set; }
    }
}

---

---

3.Program.cs中注入服务

using JwtDemo;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;
using Microsoft.OpenApi.Models;
using System.Text;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

builder.Services.AddTransient<TokenHelper>();

builder.Services.Configure<JwtSettings>(builder.Configuration.GetSection("JwtSettings"));

builder.Services.AddSwaggerGen(options =>
{
    var scheme = new OpenApiSecurityScheme()
    {
        Description = "Authorization header.\r\n Example:'Bearer 123'",
        Reference = new OpenApiReference { Type = ReferenceType.SecurityScheme, Id = "Authorization" },
        Scheme = "oauth2",
        Name = "Authorization",
        In = ParameterLocation.Header,
        Type = SecuritySchemeType.ApiKey
    };
    options.AddSecurityDefinition("Authorization", scheme);
    var requirement = new OpenApiSecurityRequirement();
    requirement[scheme] = new List<string>();
    options.AddSecurityRequirement(requirement);
});

builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme).AddJwtBearer(opt =>
{
    var jwtSettings = builder.Configuration.GetSection("JwtSettings").Get<JwtSettings>();
    byte[] keyBytes = Encoding.UTF8.GetBytes(jwtSettings.SecrentKey);
    var secKey = new SymmetricSecurityKey(keyBytes);
    opt.TokenValidationParameters = new()
    {
        ValidateIssuer = true, //验证颁发者
        ValidIssuer = jwtSettings.Issuer,
        ValidateAudience = true,  // 验证使用者
        ValidAudience = jwtSettings.Audience,
        ValidateLifetime = true, //是否验证Token有效期，使用当前时间与Token的Claims中的NotBefore和Expires对比
        ValidateIssuerSigningKey = true, //验证秘钥
        IssuerSigningKey = secKey,
        RequireExpirationTime = true,//要求Token的Claims中必须包含Expires
        ClockSkew = TimeSpan.Zero, //允许服务器时间偏移量300秒，即我们配置的过期时间加上这个允许偏移的时间值，才是真正过期的时间(过期时间 + 偏移值)你也可以设置为0，ClockSkew = TimeSpan.Zero
    };

});

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthentication();

app.UseAuthorization();

app.MapControllers();

app.Run();

builder.Services.AddSwaggerGen(); 是用来在Swagger中添加一个填写Token的按钮

builder.Services.AddAuthentication();是用来配置关于验证Token的一些配置。

app.UseAuthentication(); 添加身份认证，一定要在app.UseAuthorization()的上面。

---

---

4.Token的生成和刷新

在帮助类中并没有将Token和refreshToken 存在缓存中，大家可根据自己的业务自行添加对应的逻辑。

using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.Extensions.Caching.Distributed;
using Microsoft.Extensions.Options;
using Microsoft.IdentityModel.Tokens;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Security.Cryptography;
using System.Text;

namespace JwtDemo
{
    /// <summary>
    /// Token的帮助类
    /// </summary>
    public class TokenHelper
    {
        private readonly IOptionsSnapshot<JwtSettings> _jwtSettings;

        public TokenHelper(IOptionsSnapshot<JwtSettings> jwtSettings)
        {
            _jwtSettings = jwtSettings;
        }

        /// <summary>
        /// 颁发Token
        /// </summary>
        /// <returns></returns>
        public ResponseToken CreateToken()
        {
            List<Claim> claims = new List<Claim>()
            {
                new Claim(ClaimTypes.NameIdentifier, "1"),
                new Claim(ClaimTypes.Name, "jjm")
            };

            string key = _jwtSettings.Value.SecrentKey;

            DateTime now = DateTime.Now;

            var expores = now.AddSeconds(_jwtSettings.Value.Expirces);

            byte[] secBytes = Encoding.UTF8.GetBytes(key);
            var secKey = new SymmetricSecurityKey(secBytes);
            var credentials = new SigningCredentials(secKey, SecurityAlgorithms.HmacSha256Signature);

            var tokenDescriptor = new JwtSecurityToken(
                issuer: _jwtSettings.Value.Issuer,
                audience: _jwtSettings.Value.Audience,
                claims: claims,
                notBefore: now,
                expires: expores,
                signingCredentials: credentials);


            string token = new JwtSecurityTokenHandler().WriteToken(tokenDescriptor);
            string refreshToken = CreateRefreshToken();

            //需要将两个Token 都放在缓存中

            return new ResponseToken() { Token = token, Refresh_Token = refreshToken };
        }

        /// <summary>
        /// 生成refresh_Token
        /// </summary>
        /// <returns></returns>
        public string CreateRefreshToken()
        {
            var refresh = new byte[32];
            using (var number = RandomNumberGenerator.Create())
            {
                number.GetBytes(refresh);
                return Convert.ToBase64String(refresh);
            }

            //将refresh_Token存在缓存中
        }

        public ResponseToken Refresh(string Token, string refresh_Token)
        {
            string key = _jwtSettings.Value.SecrentKey;

            byte[] secBytes = Encoding.UTF8.GetBytes(key);
            var secKey = new SymmetricSecurityKey(secBytes);

            var tokenHandler = new JwtSecurityTokenHandler();
            SecurityToken validatedToken;

            // 根据过期Token获取一个SecurityToken
            var principal = tokenHandler.ValidateToken(Token, new TokenValidationParameters()
            {
                ValidateIssuerSigningKey = true,
                IssuerSigningKey = secKey,
                ValidateIssuer = true,
                ValidIssuer = _jwtSettings.Value.Issuer,
                ValidateAudience = true,
                ValidAudience = _jwtSettings.Value.Audience,
                ValidateLifetime = false
            }, out validatedToken);

            var jwtToken = validatedToken as JwtSecurityToken;

            if (jwtToken == null || !jwtToken.Header.Alg.Equals(SecurityAlgorithms.HmacSha256Signature, StringComparison.InvariantCultureIgnoreCase))
            {
                throw new SecurityTokenException("Token不合法");
            }

            //判断refresh_Token是否此用户生成的

            //生成新Token
            List<Claim> claims = new List<Claim>()
            {
                new Claim(ClaimTypes.NameIdentifier, "1"),
                new Claim(ClaimTypes.Name, "jjm")
            };

            var jwtSecurityToken = new JwtSecurityToken(
                claims: claims,
                notBefore: DateTime.Now,
                expires: DateTime.Now.AddSeconds(_jwtSettings.Value.Expirces),
                issuer: _jwtSettings.Value.Issuer,
                audience: _jwtSettings.Value.Audience,
                signingCredentials: new SigningCredentials(secKey, SecurityAlgorithms.HmacSha256Signature)
                );

            var token = new JwtSecurityTokenHandler().WriteToken(jwtSecurityToken);
            var refreshToken = CreateRefreshToken();

            //将缓存中原来的Token和refresh_Token 删除掉，并且保存新生成的Token

            return new ResponseToken() { Token = token, Refresh_Token = refreshToken };
        }
    }
}

---

---

5.创建Controller

[Authorize]： 将则会个特性放在控制器头部的话，整个控制器的所有方法都会需要验证。
[AllowAnonymous]：如果某个方法不需要进行Token的验证，则可以添加这个特性

using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

namespace JwtDemo.Controllers
{
    [ApiController]
    [Route("[controller]/[action]")]
    public class WeatherForecastController : ControllerBase
    {
        private TokenHelper _tokenHelper;
        private readonly ILogger<WeatherForecastController> _logger;

        public WeatherForecastController(ILogger<WeatherForecastController> logger, TokenHelper tokenHelper)
        {
            _logger = logger;
            _tokenHelper = tokenHelper;
        }

        /// <summary>
        /// 登录
        /// </summary>
        /// <param name="user">用户名</param>
        /// <param name="pwd">密码</param>
        /// <returns></returns>
        [HttpPost]
        public IActionResult Login(string user, string pwd)
        {
            if (user == "jjm" && pwd == "123")
            {
                return Ok(_tokenHelper.CreateToken());
            }
            else
            {
                return BadRequest();
            }
        }

        [HttpGet]
        [Authorize]
        public IActionResult Demo1()
        {
            return Ok("1232131");
        }

        [HttpGet]
        [AllowAnonymous]
        public IActionResult Result(string token, string refresh_token)
        {
            return Ok(_tokenHelper.Refresh(token, refresh_token));
        }
    }
}

6.测试

输入后台写死的用户名和密码获取Token



请求头增加Authorization参数，值为：Bearer +Token。（Bearer和Token 中间有空格）


通过refresh_token刷新Token


总结

以上就是生成、验证、刷新Token 的全部代码，当然这个比较简单，并没有加入相关的验证逻辑，大家可自行添加。

• 本文标题： .Net6 生成Token 和 刷新Token
• 文章分类：【.NET/Web】
• 非特殊说明，本文版权归【胡同里的砖头】个人博客 所有，转载请注明出处.

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