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using Admin.Core.Common;
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using Microsoft.AspNetCore.Authorization;
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using Microsoft.AspNetCore.Http;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.IdentityModel.Tokens;
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using System;
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using System.Collections.Generic;
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using System.Security.Claims;
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using System.Text;
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namespace Admin.Core.Extensions
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{
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/// <summary>
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/// 系统 授权服务 配置
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/// </summary>
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public static class AuthorizationSetup
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{
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public static void AddAuthorizationSetup(this IServiceCollection services)
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{
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if (services == null) throw new ArgumentNullException(nameof(services));
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// 以下四种常见的授权方式。
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// 1、这个很简单，其他什么都不用做， 只需要在API层的controller上边，增加特性即可
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// [Authorize(Roles = "Admin,System")]
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// 2、这个和上边的异曲同工，好处就是不用在controller中，写多个 roles 。
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// 然后这么写 [Authorize(Policy = "Admin")]
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services.AddAuthorization(options =>
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{
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options.AddPolicy("Client", policy => policy.RequireRole("Client").Build());
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options.AddPolicy("Admin", policy => policy.RequireRole("Admin").Build());
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options.AddPolicy("SystemOrAdmin", policy => policy.RequireRole("Admin", "System"));
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options.AddPolicy("A_S_O", policy => policy.RequireRole("Admin", "System", "Others"));
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});
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#region 参数
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//读取配置文件
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var symmetricKeyAsBase64 = AppSecretConfig.Audience_Secret_String;
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var keyByteArray = Encoding.ASCII.GetBytes(symmetricKeyAsBase64);
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var signingKey = new SymmetricSecurityKey(keyByteArray);
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var Issuer = Appsettings.app(new string[] { "Audience", "Issuer" });
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var Audience = Appsettings.app(new string[] { "Audience", "Audience" });
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var Expiration = Appsettings.app(new string[] { "Audience", "Expiration" });
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var signingCredentials = new SigningCredentials(signingKey, SecurityAlgorithms.HmacSha256);
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// 如果要数据库动态绑定，这里先留个空，后边处理器里动态赋值
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var permission = new List<PermissionItem>();
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// 角色与接口的权限要求参数
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var permissionRequirement = new PermissionRequirement(
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"/api/denied",// 拒绝授权的跳转地址（目前无用）
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permission,
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ClaimTypes.Role,//基于角色的授权
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Issuer,//发行人
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Audience,//听众
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signingCredentials,//签名凭据
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expiration: TimeSpan.FromSeconds(double.Parse(Expiration))//接口的过期时间
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);
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#endregion
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// 3、自定义复杂的策略授权
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services.AddAuthorization(options =>
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{
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options.AddPolicy(Permissions.Name,
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policy => policy.Requirements.Add(permissionRequirement));
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});
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// 4、基于Scope策略授权
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//services.AddAuthorization(options =>
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//{
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// options.AddPolicy("Scope_AdminModule_Policy", builder =>
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// {
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// //客户端Scope中包含Admin.core.api.AdminModule才能访问
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// // 同时引用nuget包：IdentityServer4.AccessTokenValidation
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// builder.RequireScope("Admin.core.api.AdminModule");
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// });
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// // 其他 Scope 策略
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// // ...
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//});
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// 这里冗余写了一次,因为很多人看不到
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services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
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// 注入权限处理器
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services.AddScoped<IAuthorizationHandler, PermissionHandler>();
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services.AddSingleton(permissionRequirement);
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}
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}
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}
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