jellyfin/Emby.Server.Implementations/Devices/DeviceId.cs

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