using System.Text;
using System.Web;
using Common;
using Extensions;
using Infrastructure;
using Model.Base;
using Util;

namespace Filters
{
    public class AuthMiddleware
    {
        public static string Do(HttpContext context)
        {
            string url = context.Request.Path;
            var options = App.OptionsSetting;
            var paths = options.GatewayFilterUrl;
            if(paths.Where(m => !m.Contains("*")).Contains(url))
            {
                return "success";
            }
            foreach(var path in paths.Where(m => m.Contains("*")))
            {
                if(url.StartsWith(path.TrimEnd('*')))
                {
                    return "success";
                }
            }
            string ip = HttpContextExtension.GetClientUserIp(context);
            var isAuthed = context.User.Identity.IsAuthenticated;
            string osType = context.Request.Headers["os"];
            //使用jwt token校验2020-11-21
            TokenModel loginUser = JwtUtil.GetLoginUser(context);
            if (loginUser != null)
            {
                var nowTime = DateTime.UtcNow;
                TimeSpan ts = loginUser.ExpireTime - nowTime;

                //Console.WriteLine($"jwt到期剩余：{ts.TotalMinutes}分,{ts.TotalSeconds}秒");

                var CK = "token_" + loginUser.userId;
                if (!CacheHelper.Exists(CK) && ts.TotalMinutes < 5)
                {
                    var newToken = JwtUtil.GenerateJwtToken(JwtUtil.AddClaims(loginUser));
                    
                    CacheHelper.SetCache(CK, CK, 1);
                    //移动端不加下面这个获取不到自定义Header
                    if (osType != null)
                    {
                        context.Response.Headers.Add("Access-Control-Expose-Headers", "X-Refresh-Token");
                    }
                    Utils.WriteLog($"userName={loginUser.username},token={newToken}", "刷新token");
                    context.Response.Headers.Add("X-Refresh-Token", newToken);
                }
            }
            if (loginUser == null)
            {
                string msg = $"请求访问[{url}]失败，无法访问系统资源";
                return msg;
            }
            return "success";
        }
    }
}