1、自定义DefaultRefreshTokenService类刷新Token

Identity Server 3的默认实现类，可以参考根据自己的需求，自定义实现：DefaultRefreshTokenService源代码

下面的MyDefaultRefreshTokenService类重写CreateRefreshTokenAsync方法，来实现针对不同用户设置不同的刷新时间(过期时间)，另外，MyDefaultRefreshTokenService类项目中还要引用IdentityModel，直接Nuget中安装IdentityModel即可。

相关文档：VS(Visual Studio)中Nuget的使用

using IdentityModel;
using IdentityServer3.Core.Logging;
using IdentityServer3.Core.Models;
using IdentityServer3.Core.Services;
using IdentityServer3.Core.Services.Default;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Claims;
using System.Threading.Tasks;
namespace Host.AspNetCore
{
    public class MyDefaultRefreshTokenService : DefaultRefreshTokenService
    {
        private readonly static ILog Logger = LogProvider.GetCurrentClassLogger();
        public MyDefaultRefreshTokenService(IRefreshTokenStore store, IEventService events) : base(store, events)
        {
        }
        public override async Task<string> CreateRefreshTokenAsync(ClaimsPrincipal subject, Token accessToken, Client client)
        {
           // return base.CreateRefreshTokenAsync(subject, accessToken, client);
            Logger.Debug("Creating refresh token");
            int lifetime;
            //这里可以根据需求，不同的用户设置不同的token刷新时间
            if (client.RefreshTokenExpiration == TokenExpiration.Absolute)
            {
                Logger.Debug("Setting an absolute lifetime: " + client.AbsoluteRefreshTokenLifetime);
                lifetime = client.AbsoluteRefreshTokenLifetime;
            }
            else
            {
                Logger.Debug("Setting a sliding lifetime: " + client.SlidingRefreshTokenLifetime);
                lifetime = client.SlidingRefreshTokenLifetime;
            }
            var handle = CryptoRandom.CreateUniqueId();
            var refreshToken = new RefreshToken
            {
                CreationTime = DateTimeOffset.UtcNow,
                LifeTime = lifetime,
                AccessToken = accessToken,
                Subject = subject
            };
            await _store.StoreAsync(handle, refreshToken);
            await RaiseRefreshTokenIssuedEventAsync(handle, refreshToken);
            return handle;
        }
    }
}

2、Startup.cs中配置RefreshTokenService

将RefreshTokenService配置为MyDefaultRefreshTokenService

public void Configure(IApplicationBuilder app, IHostingEnvironment host)
        {
            Log.Logger = new LoggerConfiguration()
               .MinimumLevel.Debug()
               .WriteTo.File(@"c:\logs\idsvrlog.txt")
               .CreateLogger();
            app.Map("/core", coreApp =>
            {
                var factory = new IdentityServerServiceFactory()
                    .UseInMemoryClients(Clients.Get())
                    .UseInMemoryScopes(Scopes.Get())
                    .UseInMemoryUsers(Users.Get());
                var refreshTokenService = new MyDefaultRefreshTokenService(new InMemoryRefreshTokenStore(), new DefaultEventService());
                factory.RefreshTokenService = new Registration<IRefreshTokenService>(resolver => refreshTokenService);
                var options = new IdentityServerOptions
                {
                    SiteName = "IdentityServer3 - AspNet Core",
                    SigningCertificate = Certificate.Get(host.ContentRootPath),
                    Factory = factory,
                };
                coreApp.UseIdentityServer(options);
            });
        }