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using System;
using System.IO;
using System.Text;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Model.IO;
using Microsoft.Extensions.Logging;
namespace Emby.Server.Implementations.Devices
{
public class DeviceId
{
private readonly IApplicationPaths _appPaths;
private readonly ILogger _logger;
private readonly IFileSystem _fileSystem;
private readonly object _syncLock = new object();
private string CachePath => Path.Combine(_appPaths.DataPath, "device.txt");
private string GetCachedId()
{
try
{
lock (_syncLock)
{
var value = File.ReadAllText(CachePath, Encoding.UTF8);
Guid guid;
if (Guid.TryParse(value, out guid))
{
return value;
}
_logger.LogError("Invalid value found in device id file");
}
}
catch (DirectoryNotFoundException)
{
}
catch (FileNotFoundException)
{
}
catch (Exception ex)
{
_logger.LogError(ex, "Error reading file");
}
return null;
}
private void SaveId(string id)
{
try
{
var path = CachePath;
_fileSystem.CreateDirectory(_fileSystem.GetDirectoryName(path));
lock (_syncLock)
{
_fileSystem.WriteAllText(path, id, Encoding.UTF8);
}
}
catch (Exception ex)
{
_logger.LogError(ex, "Error writing to file");
}
}
private static string GetNewId()
{
return Guid.NewGuid().ToString("N");
}
private string GetDeviceId()
{
var id = GetCachedId();
if (string.IsNullOrWhiteSpace(id))
{
id = GetNewId();
SaveId(id);
}
return id;
}
private string _id;
public DeviceId(IApplicationPaths appPaths, ILogger logger, IFileSystem fileSystem)
{
if (fileSystem == null) {
throw new ArgumentNullException(nameof(fileSystem));
}
_appPaths = appPaths;
_logger = logger;
_fileSystem = fileSystem;
}
public string Value => _id ?? (_id = GetDeviceId());
}
}
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