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using MediaBrowser.Common;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.Connect;
using MediaBrowser.Controller.Plugins;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Net;
using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using CommonIO;
using MediaBrowser.Common.Threading;
namespace MediaBrowser.Server.Implementations.Connect
{
public class ConnectEntryPoint : IServerEntryPoint
{
private PeriodicTimer _timer;
private readonly IHttpClient _httpClient;
private readonly IApplicationPaths _appPaths;
private readonly ILogger _logger;
private readonly IConnectManager _connectManager;
private readonly INetworkManager _networkManager;
private readonly IApplicationHost _appHost;
private readonly IFileSystem _fileSystem;
public ConnectEntryPoint(IHttpClient httpClient, IApplicationPaths appPaths, ILogger logger, INetworkManager networkManager, IConnectManager connectManager, IApplicationHost appHost, IFileSystem fileSystem)
{
_httpClient = httpClient;
_appPaths = appPaths;
_logger = logger;
_networkManager = networkManager;
_connectManager = connectManager;
_appHost = appHost;
_fileSystem = fileSystem;
}
public void Run()
{
LoadCachedAddress();
_timer = new PeriodicTimer(TimerCallback, null, TimeSpan.FromSeconds(5), TimeSpan.FromHours(1));
((ConnectManager)_connectManager).Start();
}
private readonly string[] _ipLookups =
{
"http://bot.whatismyipaddress.com",
"https://connect.emby.media/service/ip"
};
private async void TimerCallback(object state)
{
IPAddress validIpAddress = null;
foreach (var ipLookupUrl in _ipLookups)
{
try
{
validIpAddress = await GetIpAddress(ipLookupUrl).ConfigureAwait(false);
// Try to find the ipv4 address, if present
if (validIpAddress.AddressFamily == AddressFamily.InterNetwork)
{
break;
}
}
catch (HttpException)
{
}
catch (Exception ex)
{
_logger.ErrorException("Error getting connection info", ex);
}
}
// If this produced an ipv6 address, try again
if (validIpAddress != null && validIpAddress.AddressFamily == AddressFamily.InterNetworkV6)
{
foreach (var ipLookupUrl in _ipLookups)
{
try
{
var newAddress = await GetIpAddress(ipLookupUrl, true).ConfigureAwait(false);
// Try to find the ipv4 address, if present
if (newAddress.AddressFamily == AddressFamily.InterNetwork)
{
validIpAddress = newAddress;
break;
}
}
catch (HttpException)
{
}
catch (Exception ex)
{
_logger.ErrorException("Error getting connection info", ex);
}
}
}
if (validIpAddress != null)
{
((ConnectManager)_connectManager).OnWanAddressResolved(validIpAddress);
CacheAddress(validIpAddress);
}
}
private async Task<IPAddress> GetIpAddress(string lookupUrl, bool preferIpv4 = false)
{
// Sometimes whatismyipaddress might fail, but it won't do us any good having users raise alarms over it.
var logErrors = false;
#if DEBUG
logErrors = true;
#endif
using (var stream = await _httpClient.Get(new HttpRequestOptions
{
Url = lookupUrl,
UserAgent = "Emby/" + _appHost.ApplicationVersion,
LogErrors = logErrors,
// Seeing block length errors with our server
EnableHttpCompression = false,
PreferIpv4 = preferIpv4
}).ConfigureAwait(false))
{
using (var reader = new StreamReader(stream))
{
var addressString = await reader.ReadToEndAsync().ConfigureAwait(false);
return IPAddress.Parse(addressString);
}
}
}
private string CacheFilePath
{
get { return Path.Combine(_appPaths.DataPath, "wan.txt"); }
}
private void CacheAddress(IPAddress address)
{
var path = CacheFilePath;
try
{
_fileSystem.CreateDirectory(Path.GetDirectoryName(path));
_fileSystem.WriteAllText(path, address.ToString(), Encoding.UTF8);
}
catch (Exception ex)
{
_logger.ErrorException("Error saving data", ex);
}
}
private void LoadCachedAddress()
{
var path = CacheFilePath;
_logger.Info("Loading data from {0}", path);
try
{
var endpoint = _fileSystem.ReadAllText(path, Encoding.UTF8);
IPAddress ipAddress;
if (IPAddress.TryParse(endpoint, out ipAddress))
{
((ConnectManager)_connectManager).OnWanAddressResolved(ipAddress);
}
}
catch (IOException)
{
// File isn't there. no biggie
}
catch (Exception ex)
{
_logger.ErrorException("Error loading data", ex);
}
}
public void Dispose()
{
if (_timer != null)
{
_timer.Dispose();
_timer = null;
}
}
}
}
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