使用Refresh Token来更新Token。

当ASP.NET Microsoft OWIN Token失效时，我们可以通过使用Refresh Token来更新Token并解决此问题。以下是示例代码：

首先，我们需要在Startup.Auth.cs文件中添加Refresh Token的配置：

public void ConfigureAuth(IAppBuilder app) { app.UseOAuthBearerTokens(new OAuthAuthorizationServerOptions { AllowInsecureHttp = true, AccessTokenExpireTimeSpan = TimeSpan.FromMinutes(30), RefreshTokenProvider = new SimpleRefreshTokenProvider() }); }

下面是SimpleRefreshTokenProvider类的代码示例：

public class SimpleRefreshTokenProvider : IAuthenticationTokenProvider { public async Task CreateAsync(AuthenticationTokenCreateContext context) { var refreshTokenId = Guid.NewGuid().ToString("n");

    using (var refreshTokenRepository = new RefreshTokenRepository())
    {
        var token = new RefreshToken
        {
            Id = refreshTokenId,
            Subject = context.Ticket.Identity.Name,
            IssuedUtc = DateTime.UtcNow,
            ExpiresUtc = DateTime.UtcNow.AddMonths(6)
        };

        context.Ticket.Properties.IssuedUtc = token.IssuedUtc;
        context.Ticket.Properties.ExpiresUtc = token.ExpiresUtc;

        token.ProtectedTicket = context.SerializeTicket();

        var result = await refreshTokenRepository.AddRefreshToken(token);

        if (result)
        {
            context.SetToken(refreshTokenId);
        }
    }
}

public async Task ReceiveAsync(AuthenticationTokenReceiveContext context)
{
    var refreshTokenId = context.Token;

    using (var refreshTokenRepository = new RefreshTokenRepository())
    {
        var refreshToken = await refreshTokenRepository.FindRefreshToken(refreshTokenId);

        if (refreshToken != null)
        {
            context.DeserializeTicket(refreshToken.ProtectedTicket);

            var result = await refreshTokenRepository.RemoveRefreshToken(refreshTokenId);
        }
    }
}

public void Create(AuthenticationTokenCreateContext context)
{
    throw new NotImplementedException();
}

public void Receive(AuthenticationTokenReceiveContext context)
{
    throw new NotImplementedException();
}

}

Refresh Token的过期时间以及保存和获取Refresh Token以及相关信息的代码可自行实现。最后，我们可以使用Refresh Token来更新Token并避免ASP.NET Microsoft OWIN Token失效的问题。