using System.Text;
using Common;
using Extensions;
using Infrastructure;
using Infrastructure.Model;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using Services;

//本命名空间暂时先不改，改动比较大2023年9月2日
namespace Filters
{
    /// <summary>
    /// </summary>
    public class AuthorizationFilter : IAuthorizationFilter
    {
        
        private readonly ISysLoginService SysLoginService;

        public AuthorizationFilter(ISysLoginService sysLoginService)
        {
            this.SysLoginService = sysLoginService;
        }

        /// <summary>
        /// </summary>
        /// <param name="context"></param>
        public void OnAuthorization(AuthorizationFilterContext context)
        {
            var request = context.HttpContext.Request;
            string content = "";
            if(context.HttpContext.Request.Method.ToLower() == "get")
            {
                content = context.HttpContext.GetQueryString();
                content = content.Substring(content.IndexOf("=") + 1);
                content = Decrypt(content);
                request.QueryString = new QueryString("value=" + content);
            }
            else if(context.HttpContext.Request.Method.ToLower() == "delete")
            {
                string path = request.Path.Value;
                path = path.Substring(0, path.LastIndexOf("/") + 1) + Decrypt(path.Substring(path.LastIndexOf("/") + 1));
            }
            else
            {
                content = context.HttpContext.GetBody();
                content = Decrypt(content);
                //{"username":"admin","password":"000000"}
                request.Body = new MemoryStream(Encoding.UTF8.GetBytes(content));

                //验证登录接口
                if(request.Path.Value.EndsWith("/oauth2/token"))
                {
                    var scope = request.Query["scope"].ToString();
                    var grantType = request.Query["grant_type"].ToString();
                    bool checkLogin = SysLoginService.CheckLogin(scope, grantType, context.HttpContext.GetToken().Replace("Basic ", ""));
                    if(!checkLogin)
                    {
                        string msg = $"请求访问失败，无法访问系统资源";
                        context.Result = new JsonResult(ApiResult.Error(ResultCode.DENY, msg));
                    }
                }
            }
        }

        public string Decrypt(string str)
        {
            str = Encoding.UTF8.GetString(Convert.FromBase64String(str));
            return Dbconn.AesDecrypt(str, Base.GlobalConstant.ApiKey, Base.GlobalConstant.ApiIv);
        }
    }
}