.net core 3.1 使用jwt完成登录验证

nuget安装：Microsoft.AspNetCore.Authentication.JwtBearer  3.1.0 版本

一、添加配置文件

 "Authentication": {
    "JwtBearer": {
      "IsEnabled": "true",
      "SecurityKey": "Demo_C421AAEE0D114E9C1",
      "Issuer": "Demo",
      "Audience": "Demo",
      "Expiration": 60 //token过期时间 （单位：分钟）
    }
  }

二、添加一个扩展类和jwt配置文件类

 public static class AuthConfigure
    {
        public static void ConfigureJwt(this IServiceCollection services, IConfiguration configuration)
        {
            if (bool.Parse(configuration["Authentication:JwtBearer:IsEnabled"]))
            {
                services.AddAuthentication(options =>
                {
                    options.DefaultAuthenticateScheme = "JwtBearer";
                    options.DefaultChallengeScheme = "JwtBearer";
                }).AddJwtBearer("JwtBearer", options =>
                {
                    options.Audience = configuration["Authentication:JwtBearer:Audience"];

                    options.TokenValidationParameters = new TokenValidationParameters
                    {
                        // The signing key must match!
                        ValidateIssuerSigningKey = true,
                        IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(configuration["Authentication:JwtBearer:SecurityKey"])),

                        // Validate the JWT Issuer (iss) claim
                        ValidateIssuer = true,
                        ValidIssuer = configuration["Authentication:JwtBearer:Issuer"],

                        // Validate the JWT Audience (aud) claim
                        ValidateAudience = true,
                        ValidAudience = configuration["Authentication:JwtBearer:Audience"],

                        // Validate the token expiry
                        ValidateLifetime = true,

                        // If you want to allow a certain amount of clock drift, set that here
                        ClockSkew = TimeSpan.Zero
                    };
                });
            }
        }
    }

 public class JwtConfig
    {
        /// 

        /// 密钥
        /// 
        public string SecurityKey { get; set; }
        /// 

        /// 所属者
        /// 
        public string Issuer { get; set; }

        public string Audience { get; set; }

        /// 

        /// 过期时间
        /// 
        public int Expiration { get; set; }
    }

三、配置Startup

public void ConfigureServices(IServiceCollection services)
{
    //配置jwt
    services.ConfigureJwt(Configuration);
    //注入JWT配置文件
    services.Configure(Configuration.GetSection("Authentication:JwtBearer"));
    services.AddControllers();
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    app.UseHttpsRedirection();
    app.UseRouting();
    app.UseAuthentication(); //一定要在这个位置（app.UseAuthorization()上面）
    app.UseAuthorization();
    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllerRoute(
        name: "default",
        pattern: "{controller=Home}/{action=Index}/{id?}");
    });
}

四、登录接口

在需要验证的接口上加特性：[Authorize]

        private readonly JwtConfig jwtModel = null;
        public JwtLoginController(IOptions _jwtModel)//注入jwt配置参数
        {
            jwtModel = _jwtModel.Value;
        }       

         /// 

        /// 登录
        /// 
        /// 
        [HttpPost]
        public async Task Login(LoginDto dto)
        {
            //一波验证逻辑。。。。。。
            
            //下面代码自行封装
            var claims = new List();
            claims.AddRange(new[]
            {
                new Claim("UserName", dto.UserName),
                new Claim(JwtRegisteredClaimNames.Sub, dto.UserName),
                new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),
                new Claim(JwtRegisteredClaimNames.Iat, DateTimeOffset.Now.ToUnixTimeSeconds().ToString(), ClaimValueTypes.Integer64)
            });

            DateTime now = DateTime.UtcNow;
            var jwtSecurityToken = new JwtSecurityToken(
                issuer: jwtModel.Issuer,
                audience: jwtModel.Audience,
                claims: claims,
                notBefore: now,
                expires: now.Add(TimeSpan.FromMinutes(jwtModel.Expiration)),
                signingCredentials: new SigningCredentials(new SymmetricSecurityKey(Encoding.ASCII.GetBytes(jwtModel.SecurityKey)), SecurityAlgorithms.HmacSha256)
            );
            
            string token = new JwtSecurityTokenHandler().WriteToken(jwtSecurityToken);

            return token;
        }

        public class LoginDto
        {
            public string UserName { get; set; }
            public string Password { get; set; }
        }