using System;
using System.IO;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace ETFileServer
{
    [Route("")]
    [ApiController]
    public class DownLoadController: Controller
    {
        private IConfigurationRoot _config = Startup.config;
        private ILogger<DownLoadController> _logger;

        public DownLoadController(ILogger<DownLoadController> logger)
        {
            this._logger = logger;
        }

        [HttpGet("{dir}/{fileName}")]
        public IActionResult Get(string dir, string fileName)
        {
            string url = $"{dir}/{fileName}";
            _logger.Log(LogLevel.Information, $"========{url}");
            string configDir = this._config["DirectoryPath"];
            string value = configDir + url;
            FileInfo fileInfo = new FileInfo(value);
            if (!fileInfo.Exists || !fileInfo.FullName.StartsWith(Path.GetFullPath(configDir)))
            {
                return NoContent();
            }

            return PhysicalFile(fileInfo.FullName, "application/x-msdownload");
        }

        public override void OnActionExecuting(ActionExecutingContext context)
        {
            var httpContext = context.HttpContext;
            if (httpContext.Request.Method != "GET")
            {
                httpContext.Abort();
                return;
            }

            if (httpContext.WebSockets.IsWebSocketRequest)
            {
                httpContext.Abort();
                return;
            }

            if (httpContext.Request.HasFormContentType)
            {
                httpContext.Abort();
                return;
            }

            if (httpContext.Request.PathBase.HasValue)
            {
                httpContext.Abort();
                return;
            }

            if (httpContext.Request.Query.Count > 0)
            {
                httpContext.Abort();
                return;
            }

            if (httpContext.Request.QueryString.HasValue)
            {
                httpContext.Abort();
                return;
            }
        }

        public override void OnActionExecuted(ActionExecutedContext context)
        {
        }
    }
}