jellyfin/MediaBrowser.Common.Implementations/IO/CommonFileSystem.cs
2014-02-13 23:00:13 -05:00

367 lines
11 KiB
C#

using MediaBrowser.Common.Extensions;
using MediaBrowser.Common.IO;
using MediaBrowser.Model.Logging;
using System;
using System.IO;
using System.Text;
namespace MediaBrowser.Common.Implementations.IO
{
/// <summary>
/// Class CommonFileSystem
/// </summary>
public class CommonFileSystem : IFileSystem
{
protected ILogger Logger;
private readonly bool _supportsAsyncFileStreams;
public CommonFileSystem(ILogger logger, bool supportsAsyncFileStreams)
{
Logger = logger;
_supportsAsyncFileStreams = supportsAsyncFileStreams;
}
/// <summary>
/// Determines whether the specified filename is shortcut.
/// </summary>
/// <param name="filename">The filename.</param>
/// <returns><c>true</c> if the specified filename is shortcut; otherwise, <c>false</c>.</returns>
/// <exception cref="System.ArgumentNullException">filename</exception>
public virtual bool IsShortcut(string filename)
{
if (string.IsNullOrEmpty(filename))
{
throw new ArgumentNullException("filename");
}
var extension = Path.GetExtension(filename);
return string.Equals(extension, ".mblink", StringComparison.OrdinalIgnoreCase);
}
/// <summary>
/// Resolves the shortcut.
/// </summary>
/// <param name="filename">The filename.</param>
/// <returns>System.String.</returns>
/// <exception cref="System.ArgumentNullException">filename</exception>
public virtual string ResolveShortcut(string filename)
{
if (string.IsNullOrEmpty(filename))
{
throw new ArgumentNullException("filename");
}
if (string.Equals(Path.GetExtension(filename), ".mblink", StringComparison.OrdinalIgnoreCase))
{
return File.ReadAllText(filename);
}
return null;
}
/// <summary>
/// Creates the shortcut.
/// </summary>
/// <param name="shortcutPath">The shortcut path.</param>
/// <param name="target">The target.</param>
/// <exception cref="System.ArgumentNullException">
/// shortcutPath
/// or
/// target
/// </exception>
public void CreateShortcut(string shortcutPath, string target)
{
if (string.IsNullOrEmpty(shortcutPath))
{
throw new ArgumentNullException("shortcutPath");
}
if (string.IsNullOrEmpty(target))
{
throw new ArgumentNullException("target");
}
File.WriteAllText(shortcutPath, target);
}
/// <summary>
/// Gets the file system info.
/// </summary>
/// <param name="path">The path.</param>
/// <returns>FileSystemInfo.</returns>
public FileSystemInfo GetFileSystemInfo(string path)
{
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException("path");
}
// Take a guess to try and avoid two file system hits, but we'll double-check by calling Exists
if (Path.HasExtension(path))
{
var fileInfo = new FileInfo(path);
if (fileInfo.Exists)
{
return fileInfo;
}
return new DirectoryInfo(path);
}
else
{
var fileInfo = new DirectoryInfo(path);
if (fileInfo.Exists)
{
return fileInfo;
}
return new FileInfo(path);
}
}
/// <summary>
/// The space char
/// </summary>
private const char SpaceChar = ' ';
/// <summary>
/// The invalid file name chars
/// </summary>
#if __MonoCS__
//GetInvalidFileNameChars is less restrictive in Linux/Mac than Windows, this mimic Windows behavior for mono under Linux/Mac.
private static readonly char[] InvalidFileNameChars = new char [41] { '\x00', '\x01', '\x02', '\x03', '\x04', '\x05', '\x06', '\x07',
'\x08', '\x09', '\x0A', '\x0B', '\x0C', '\x0D', '\x0E', '\x0F', '\x10', '\x11', '\x12',
'\x13', '\x14', '\x15', '\x16', '\x17', '\x18', '\x19', '\x1A', '\x1B', '\x1C', '\x1D',
'\x1E', '\x1F', '\x22', '\x3C', '\x3E', '\x7C', ':', '*', '?', '\\', '/' };
#else
private static readonly char[] InvalidFileNameChars = Path.GetInvalidFileNameChars();
#endif
/// <summary>
/// Takes a filename and removes invalid characters
/// </summary>
/// <param name="filename">The filename.</param>
/// <returns>System.String.</returns>
/// <exception cref="System.ArgumentNullException">filename</exception>
public string GetValidFilename(string filename)
{
if (string.IsNullOrEmpty(filename))
{
throw new ArgumentNullException("filename");
}
var builder = new StringBuilder(filename);
foreach (var c in InvalidFileNameChars)
{
builder = builder.Replace(c, SpaceChar);
}
return builder.ToString();
}
/// <summary>
/// Gets the creation time UTC.
/// </summary>
/// <param name="info">The info.</param>
/// <returns>DateTime.</returns>
public DateTime GetCreationTimeUtc(FileSystemInfo info)
{
// This could throw an error on some file systems that have dates out of range
try
{
return info.CreationTimeUtc;
}
catch (Exception ex)
{
Logger.ErrorException("Error determining CreationTimeUtc for {0}", ex, info.FullName);
return DateTime.MinValue;
}
}
/// <summary>
/// Gets the creation time UTC.
/// </summary>
/// <param name="info">The info.</param>
/// <returns>DateTime.</returns>
public DateTime GetLastWriteTimeUtc(FileSystemInfo info)
{
// This could throw an error on some file systems that have dates out of range
try
{
return info.LastWriteTimeUtc;
}
catch (Exception ex)
{
Logger.ErrorException("Error determining LastAccessTimeUtc for {0}", ex, info.FullName);
return DateTime.MinValue;
}
}
/// <summary>
/// Gets the last write time UTC.
/// </summary>
/// <param name="path">The path.</param>
/// <returns>DateTime.</returns>
public DateTime GetLastWriteTimeUtc(string path)
{
return GetLastWriteTimeUtc(GetFileSystemInfo(path));
}
/// <summary>
/// Gets the file stream.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="mode">The mode.</param>
/// <param name="access">The access.</param>
/// <param name="share">The share.</param>
/// <param name="isAsync">if set to <c>true</c> [is asynchronous].</param>
/// <returns>FileStream.</returns>
public FileStream GetFileStream(string path, FileMode mode, FileAccess access, FileShare share, bool isAsync = false)
{
if (_supportsAsyncFileStreams && isAsync)
{
return new FileStream(path, mode, access, share, 4096, true);
}
return new FileStream(path, mode, access, share);
}
/// <summary>
/// Swaps the files.
/// </summary>
/// <param name="file1">The file1.</param>
/// <param name="file2">The file2.</param>
public void SwapFiles(string file1, string file2)
{
if (string.IsNullOrEmpty(file1))
{
throw new ArgumentNullException("file1");
}
if (string.IsNullOrEmpty(file2))
{
throw new ArgumentNullException("file2");
}
var temp1 = Path.GetTempFileName();
var temp2 = Path.GetTempFileName();
// Copying over will fail against hidden files
RemoveHiddenAttribute(file1);
RemoveHiddenAttribute(file2);
File.Copy(file1, temp1, true);
File.Copy(file2, temp2, true);
File.Copy(temp1, file2, true);
File.Copy(temp2, file1, true);
File.Delete(temp1);
File.Delete(temp2);
}
/// <summary>
/// Removes the hidden attribute.
/// </summary>
/// <param name="path">The path.</param>
private void RemoveHiddenAttribute(string path)
{
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException("path");
}
var currentFile = new FileInfo(path);
// This will fail if the file is hidden
if (currentFile.Exists)
{
if ((currentFile.Attributes & FileAttributes.Hidden) == FileAttributes.Hidden)
{
currentFile.Attributes &= ~FileAttributes.Hidden;
}
}
}
public bool ContainsSubPath(string parentPath, string path)
{
if (string.IsNullOrEmpty(parentPath))
{
throw new ArgumentNullException("parentPath");
}
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException("path");
}
return path.IndexOf(parentPath.TrimEnd(Path.DirectorySeparatorChar) + Path.DirectorySeparatorChar, StringComparison.OrdinalIgnoreCase) != -1;
}
public bool IsRootPath(string path)
{
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException("path");
}
var parent = Path.GetDirectoryName(path);
if (!string.IsNullOrEmpty(parent))
{
return false;
}
return true;
}
public string NormalizePath(string path)
{
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException("path");
}
if (path.EndsWith(":\\", StringComparison.OrdinalIgnoreCase))
{
return path;
}
return path.TrimEnd(Path.DirectorySeparatorChar);
}
public string SubstitutePath(string path, string from, string to)
{
if (string.IsNullOrWhiteSpace(path))
{
throw new ArgumentNullException("path");
}
if (string.IsNullOrWhiteSpace(from))
{
throw new ArgumentNullException("from");
}
if (string.IsNullOrWhiteSpace(to))
{
throw new ArgumentNullException("to");
}
path = path.Replace(from, to, StringComparison.OrdinalIgnoreCase);
if (to.IndexOf('/') != -1)
{
path = path.Replace('\\', '/');
}
else
{
path = path.Replace('/', '\\');
}
return path;
}
}
}