.NET8发布后，AOT解决了JWT Authentication

随着.NET8发布，AOT的JWT Authentication也完成了，这样，构建一个基本的AOT API成为了可能，可以把AOT引入到一些简单的API项目中来了。关于AOT的好处，请参照：

下面是一增加JWT Authentication的一个简单Demo，时间仓促，仅供参考。

using Microsoft.AspNetCore.Authentication.JwtBearer;using Microsoft.AspNetCore.Authorization;using Microsoft.Extensions.Options;using Microsoft.IdentityModel.Tokens;using System.IdentityModel.Tokens.Jwt;using System.Security;using System.Security.Claims;using System.Text;using System.Text.Json.Serialization;
var builder = WebApplication.CreateSlimBuilder(args);builder.Services.ConfigureHttpJsonOptions(options =>{ options.SerializerOptions.TypeInfoResolverChain.Insert(0, AppJsonSerializerContext.Default);});#region 策略builder.Services .AddAuthorization(options => { //添加策略名称 options.AddPolicy("Permission", policyBuilder => policyBuilder.AddRequirements(new PermissionRequirement())); }).AddSingleton(new List<Permission> { new Permission { RoleName = "admin", Url = "/Policy", Method = "get" }, new Permission { RoleName = "admin", Url = "/todos", Method = "get" },}).AddSingleton<IAuthorizationHandler, PermissionHandler>().AddAuthentication(options =>{ options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme; options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;}).AddJwtBearer(opt =>{ //token验证参数 opt.TokenValidationParameters = new TokenValidationParameters { ValidateIssuerSigningKey = true, IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes("1234567890abcdefg1234567890abcdefg")), ValidateIssuer = true, ValidIssuer = "http://localhost:5274", ValidateAudience = true, ValidAudience = "http://localhost:5274", ClockSkew = TimeSpan.Zero, RequireExpirationTime = true, };});#endregionvar app = builder.Build();var sampleTodos = new Todo[] { new(1, "Walk the dog"), new(2, "Do the dishes", DateOnly.FromDateTime(DateTime.Now)), new(3, "Do the laundry", DateOnly.FromDateTime(DateTime.Now.AddDays(1))), new(4, "Clean the bathroom"), new(5, "Clean the car", DateOnly.FromDateTime(DateTime.Now.AddDays(2)))};
var todosApi = app.MapGroup("/todos");todosApi.MapGet("/", () => sampleTodos).RequireAuthorization("Permission"); ;todosApi.MapGet("/{id}", (int id) => sampleTodos.FirstOrDefault(a => a.Id == id) is { } todo ? Results.Ok(todo) : Results.NotFound()).RequireAuthorization("Permission");#region 策略app.MapGet("/login", () =>{ //用JWTSecurityTokenHandler生成token return new JwtSecurityTokenHandler().WriteToken( new JwtSecurityToken( issuer: "http://localhost:5274", audience: "http://localhost:5274", claims: new Claim[] { new Claim(ClaimTypes.Role, "admin"), new Claim(ClaimTypes.Name, "桂素伟") }, notBefore: DateTime.UtcNow, expires: DateTime.UtcNow.AddSeconds(500000), signingCredentials: new SigningCredentials( new SymmetricSecurityKey(Encoding.ASCII.GetBytes("1234567890abcdefg1234567890abcdefg")), SecurityAlgorithms.HmacSha256Signature) ) );});app.MapGet("/policy", (ClaimsPrincipal user) => $"Hello 用户：{user.Identity?.Name}, 角色：{user.Claims?.Where(s => s.Type == ClaimTypes.Role).First().Value}. This is a policy!").RequireAuthorization("Permission");#endregionapp.Run();public record Todo(int Id, string? Title, DateOnly? DueBy = null, bool IsComplete = false);
[JsonSerializable(typeof(Todo[]))]internal partial class AppJsonSerializerContext : JsonSerializerContext{}#region 策略public class PermissionRequirement : IAuthorizationRequirement{}public class Permission{ public string? RoleName { get; set; } public string? Url { get; set; } public string? Method { get; set; }}public class PermissionHandler : AuthorizationHandler<PermissionRequirement>{ private readonly List<Permission> _userPermissions; public PermissionHandler(List<Permission> permissions) { _userPermissions = permissions;    } protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, PermissionRequirement requirement) { if (context.Resource is DefaultHttpContext) { var httpContext = context.Resource as DefaultHttpContext; var questPath = httpContext?.Request?.Path; var method = httpContext?.Request?.Method; var isAuthenticated = context?.User?.Identity?.IsAuthenticated; if (isAuthenticated.HasValue && isAuthenticated.Value) { var role = context?.User?.Claims?.SingleOrDefault(s => s.Type == ClaimTypes.Role)?.Value; if (_userPermissions.Where(w => w.RoleName == role && w.Method?.ToUpper() == method?.ToUpper() && w.Url?.ToLower() == questPath).Count() > 0) { context?.Succeed(requirement); } else { context?.Fail(); } } } return Task.CompletedTask; }}#endregion

下面是演示结果：

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还有很多模板不支持或不完全支持AOT，下面是当前.NET8发布的适配情况。