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   源码介绍

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.NET Core JWT（JSON Web Token）是一种用于身份验证和授权的开放标准。它是一种轻量级的安全令牌，用于在不同的应用程序或服务之间传递身份验证信息。

private readonly UserManager<IdentityUser> userManager;
        private readonly RoleManager<IdentityRole> roleManager;
        private readonly IConfiguration configuration;

        public AuthenticateController(UserManager<IdentityUser> userManager, RoleManager<IdentityRole> roleManager, IConfiguration configuration)
        {
            this.userManager = userManager;
            this.roleManager = roleManager;
            this.configuration = configuration;
        }
        /// <summary>
        /// 用户登陆
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        [HttpPost]
        public async Task<IActionResult> Login([FromBody] LoginModel model)
        {
            var user = await userManager.FindByNameAsync(model.Username);
            if(user != null && await userManager.CheckPasswordAsync(user, model.Password))
            {
                var userRoles = await userManager.GetRolesAsync(user);
                var authClaims = new List<Claim>
                {
                    new Claim(ClaimTypes.Name, user.UserName),
                    new Claim(JwtRegisteredClaimNames.Jti,Guid.NewGuid().ToString())
                };

                foreach (var userRole in userRoles)
                {
                    authClaims.Add(new Claim(ClaimTypes.Role, userRole));
                }

                var token = GetToken(authClaims);
                return Ok(new
                {
                    token = new JwtSecurityTokenHandler().WriteToken(token),
                    expiration = token.ValidTo
                });
            }

            return Unauthorized();
        }

        /// <summary>
        /// 获取token
        /// </summary>
        /// <param name="authClaims"></param>
        /// <returns></returns>
        private JwtSecurityToken GetToken(List<Claim> authClaims)
        {
            var authSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(configuration["JWT:Secret"]));

            var token = new JwtSecurityToken(
                issuer: configuration["JWT:ValidIssuer"],
                audience: configuration["JWT:ValidAudience"],
                expires: DateTime.Now.AddHours(3),
                claims: authClaims,
                signingCredentials: new SigningCredentials(authSigningKey, SecurityAlgorithms.HmacSha256)
            );

            return token;
        }