.NET7之MiniAPI(特别篇)：Preview5优化了JWT验证（下）

　　Preview5对策略验证的方式没有改变，只不过内置了Token的生成，和《.NET6之MiniAPI(十)：基于策略的身份验证和授权》的验证方式基本相同，都是生成和验证使用的验证参数要一致，用继承AuthorizationHandler的子类来作每次请求的验证。

　　在具体的路由上，用RequireAuthorization("Permission")来配置策略名称，以达到请求转向验证。

　　不多说了，看代码实现，可以《.NET6之MiniAPI(十)：基于策略的身份验证和授权》作个比较。

using Microsoft.AspNetCore.Authorization;
using Microsoft.IdentityModel.Tokens;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Text;
var builder = WebApplication.CreateBuilder(args);
#region 添加策略验证参数
builder.Authentication.AddJwtBearer(opt =>
{
opt.TokenValidatiOnParameters= new TokenValidationParameters
{
ValidateIssuerSigningKey = true,
IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes("1234567890abcdefg")),
ValidateIssuer = true,
ValidIssuer = "http://localhost:5274",
ValidateAudience = true,
ValidAudience = "http://localhost:5274",
ClockSkew = TimeSpan.Zero,
RequireExpiratiOnTime= true,
}; ;
});
//添加策略名和注与策略验证服务
builder.Services
.AddAuthorization(optiOns=>
{
//添加策略名称
options.AddPolicy("Permission", policyBuilder => policyBuilder.AddRequirements(new PermissionRequirement()));
})
.AddSingleton(new List

{ new Permission { RoleName = "admin", Url = "/Policy", Method = "get" } })
.AddSingleton();
var app = builder.Build();
//登录，生成token
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("1234567890abcdefg")),
SecurityAlgorithms.HmacSha256)
)
);
});
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");
app.Run();
#region 策略验证功能
public class PermissionRequirement : IAuthorizationRequirement
{
}
//权限的实体集合
public class Permission
{
public string? RoleName { get; set; }
public string? Url { get; set; }
public string? Method { get; set; }
}
//权限验证类
public class PermissionHandler : AuthorizationHandler

{
private readonly List

_userPermissions;
public PermissionHandler(List

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

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