---

目的

.Net6使用JWT实现登录认证和授权
接口分三种类型：
1.游客模式：没有登录也可以访问的接口
2.用户模式：普通用户登录，可以访问的接口（登录即可访问）
3.管理模式：鉴定Token权限，拥有管理员资格的用户，才能访问

https://gitee.com/hgcjd/JWTDemoTest.git

---

实现案例

一.项目所需包：

---

二.配置项目 appsettings.json 文件：

配置jwt所需信息

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "JwtTokenOptions": {
    "Issuer": "http://xxxx.com",
    "Audience": "http://xxxx.com",
    "SecurityKey": "qwertyuiopasdfghjklzxcvbnm1234567890"
  }
}

---

三.创建Model文件夹，添加AppConfig类和UserRole类

1.AppConfig类获取appsettings.json文件中的值

/// <summary>
/// 获取.NetCore配置文件信息
/// </summary>
public class AppConfig
{
    public static string GetConfigInfo(string Key)
    {
        var builder = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile("appsettings.json");

        IConfigurationRoot configuration = builder.Build();
        string configStr = configuration.GetSection($"{Key}").Value;
        if (!string.IsNullOrWhiteSpace(configStr))
        {
            return configStr;
        }
        return null;
    }

}

2.UserRole类用于区分用户信息和权限

/// <summary>
/// 用户,权限
/// </summary>
public class UserRole
{
    //权限
    public int Role { get; set; }

    /// <summary>
    /// 用户名
    /// </summary>
    public string UserId { get; set; }

    /// <summary>
    /// 密码
    /// </summary>
    public string Password { get; set; }
}

---

四.主体代码案例：

1.LoginController 控制器，实现用户登录，JWT授权

[Route("login")]
[ApiController]
public class LoginController : ControllerBase
{

    /// <summary>
    /// 用户列表
    /// </summary>
    private readonly static List<UserRole> _Users = new List<UserRole>()
    {
        new UserRole{ Role = 1,UserId = "administrator",Password = "123456" },   //管理员
        new UserRole{ Role = 0,UserId = "user",Password = "1"}   //普通用户
    };

    /// <summary>
    /// 管理权限配置
    /// </summary>
    private readonly static List<Claim> _administrator = new List<Claim>() {
         new Claim(ClaimTypes.Name,"administrator"),
         new Claim(ClaimTypes.Role,"administrator"),
         new Claim(ClaimTypes.Role,"user"),
    };

    /// <summary>
    /// 普通用户权限配置
    /// </summary>
    private readonly static List<Claim> _user = new List<Claim>() {
         new Claim(ClaimTypes.Name,"user"),
         new Claim(ClaimTypes.Role,"user"),
    };

    /// <summary>
    /// 用户登录接口
    /// </summary>
    /// <param name="userid"></param>
    /// <param name="password"></param>
    /// <returns></returns>
    [Route("login")]
    [HttpPost]
    public string Login(string userid,string password)
    {
        if (!string.IsNullOrWhiteSpace(userid) && !string.IsNullOrWhiteSpace(password))
        {
            var list = _Users.Where(e => e.UserId.ToString() == userid && e.Password == password).ToList();
            if (list != null && list.Count > 0)
            {
                var userInfo = list[0];
                var claims = new List<Claim>();
                if (userInfo.Role == 1)
                    claims = _administrator;//管理权限
                else
                    claims = _user;//普通用户

                JwtSecurityToken token = new JwtSecurityToken(
                        issuer:AppConfig.GetConfigInfo("JwtTokenOptions:Issuer"),
                        audience: AppConfig.GetConfigInfo("JwtTokenOptions:Audience"),
                        claims: claims,
                        expires: DateTime.Now.AddMinutes(5),
                        signingCredentials: new SigningCredentials(new SymmetricSecurityKey(Encoding.UTF8.GetBytes(AppConfig.GetConfigInfo("JwtTokenOptions:SecurityKey"))), SecurityAlgorithms.HmacSha256)
                    ); 
                string tokenStr = new JwtSecurityTokenHandler().WriteToken(token);
                return tokenStr;
            }
        }
        return null;
    }
}

2.HomeController 控制器，无需登录，游客模式也能访问

/// <summary>
/// 公共接口，游客也可以访问
/// </summary>
[Route("Home")]
[ApiController]
public class HomeController : ControllerBase
{
    [Route("Hello")]
    [HttpGet]
    public async Task<string> HelloAction()
    {
        return "Hello People~";
    }
}

3.UserRoleController 控制器，用户登录之后可以访问

通过 [Authorize]属性实现，该属性也可以放在单个接口上，使单个接口需要权限认证

/// <summary>
/// 登录后，用户权限是User的才能访问
/// </summary>
[Route("UserRole")]
[ApiController]
//[Authorize(Roles ="user")]
[Authorize]
public class UserRoleController : ControllerBase
{
    [Route("Hello")]
    [HttpGet]
    public async Task<string> HelloUser()
    {
        return "Hello User~";
    }
}

4.AdminController 控制器，管理员权限登录之后可以访问

通过 [Authorize(Roles = “administrator”)]实现，Roles 标注需要的权限类型，该属性也可以放在接口上

/// <summary>
/// 管理员登录，才能访问
/// </summary>
[Route("AdminRole")]
[ApiController]
[Authorize(Roles = "administrator")]
public class AdminController : ControllerBase
{
    [Route("Hello")]
    [HttpGet]
    public async Task<string> HelloAdmin()
    {
        return "Hello Administrator~";
    }
}

5.在Program中注册JWT，swagge添加Jwt入口

using JwtDemoTest.Model;
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();

#region 注册Jwt认证
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme).AddJwtBearer("Bearer", o =>
{
    o.TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuerSigningKey = true,//是否验证签名,不验证的画可以篡改数据，不安全
        IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(AppConfig.GetConfigInfo("JwtTokenOptions:SecurityKey"))),//解密的密钥
        ValidateIssuer = true,//是否验证发行人，就是验证载荷中的Iss是否对应ValidIssuer参数
        ValidIssuer = AppConfig.GetConfigInfo("JwtTokenOptions:Issuer"),//发行人,
        ValidateAudience = true,//是否验证订阅人，就是验证载荷中的Aud是否对应ValidAudience参数
        ValidAudience = AppConfig.GetConfigInfo("JwtTokenOptions:Audience")//订阅人       
    };
});
builder.Services.AddAuthorization();
#endregion

#region swagge添加Jwt认证
builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new OpenApiInfo { Title = "My WebApi JwtDemoTest", Version = "v1" });

    // 定义安全定义
    c.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
    {
        Description = "JWT Authorization header using the Bearer scheme",
        Name = "Authorization",
        In = ParameterLocation.Header,
        Type = SecuritySchemeType.ApiKey,
        Scheme = "Bearer"
    });

    // 添加认证要求
    c.AddSecurityRequirement(new OpenApiSecurityRequirement
    {
        {
            new OpenApiSecurityScheme
            {
                Reference = new OpenApiReference
                {
                    Type = ReferenceType.SecurityScheme,
                    Id = "Bearer"
                }
            },
            Array.Empty<string>()
        }
    });
});
#endregion


var app = builder.Build();

app.UseAuthentication();

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

app.UseAuthorization();

app.MapControllers();

app.Run();

五.项目运行

1.游客模式：

项目未登录，也可访问Home/Hello接口

2.普通用户模式：

普通用户登录获取Token，然后调用接口访问成功
首先调用login/login接口，获取普通用户权限token

接口携带token

携带普通用户登录后的token之后，访问 userrole/hello 接口成功

3.接着使用管理员账户登录，访问admin/hello

结果

.Net6 JWT搭建认证，授权，鉴权成功