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#nullable enable
using System;
using System.Diagnostics.CodeAnalysis;
using System.Text.RegularExpressions;
namespace Emby.Server.Implementations.Library
{
/// <summary>
/// Class providing extension methods for working with paths.
/// </summary>
public static class PathExtensions
{
/// <summary>
/// Gets the attribute value.
/// </summary>
/// <param name="str">The STR.</param>
/// <param name="attribute">The attrib.</param>
/// <returns>System.String.</returns>
/// <exception cref="ArgumentException"><paramref name="str" /> or <paramref name="attribute" /> is empty.</exception>
public static string? GetAttributeValue(this string str, string attribute)
{
if (str.Length == 0)
{
throw new ArgumentException("String can't be empty.", nameof(str));
}
if (attribute.Length == 0)
{
throw new ArgumentException("String can't be empty.", nameof(attribute));
}
string srch = "[" + attribute + "=";
int start = str.IndexOf(srch, StringComparison.OrdinalIgnoreCase);
if (start != -1)
{
start += srch.Length;
int end = str.IndexOf(']', start);
return str.Substring(start, end - start);
}
// for imdbid we also accept pattern matching
if (string.Equals(attribute, "imdbid", StringComparison.OrdinalIgnoreCase))
{
var m = Regex.Match(str, "tt([0-9]{7,8})", RegexOptions.IgnoreCase);
return m.Success ? m.Value : null;
}
return null;
}
/// <summary>
/// Replaces a sub path with another sub path and normalizes the final path.
/// </summary>
/// <param name="path">The original path.</param>
/// <param name="subPath">The original sub path.</param>
/// <param name="newSubPath">The new sub path.</param>
/// <param name="newPath">The result of the sub path replacement</param>
/// <returns>The path after replacing the sub path.</returns>
/// <exception cref="ArgumentNullException"><paramref name="path" />, <paramref name="newSubPath" /> or <paramref name="newSubPath" /> is empty.</exception>
public static bool TryReplaceSubPath(this string path, string subPath, string newSubPath, [NotNullWhen(true)] out string? newPath)
{
if (string.IsNullOrWhiteSpace(path))
{
throw new ArgumentNullException(nameof(path));
}
if (string.IsNullOrWhiteSpace(subPath))
{
throw new ArgumentNullException(nameof(subPath));
}
if (string.IsNullOrWhiteSpace(newSubPath))
{
throw new ArgumentNullException(nameof(newSubPath));
}
char oldDirectorySeparatorChar;
char newDirectorySeparatorChar;
// True normalization is still not possible https://github.com/dotnet/runtime/issues/2162
// The reasoning behind this is that a forward slash likely means it's a Linux path and
// so the whole path should be normalized to use / and vice versa for Windows (although Windows doesn't care much).
if (newSubPath.Contains('/', StringComparison.Ordinal))
{
oldDirectorySeparatorChar = '\\';
newDirectorySeparatorChar = '/';
}
else
{
oldDirectorySeparatorChar = '/';
newDirectorySeparatorChar = '\\';
}
if (path.Contains(oldDirectorySeparatorChar, StringComparison.Ordinal))
{
path = path.Replace(oldDirectorySeparatorChar, newDirectorySeparatorChar);
}
if (subPath.Contains(oldDirectorySeparatorChar, StringComparison.Ordinal))
{
subPath = subPath.Replace(oldDirectorySeparatorChar, newDirectorySeparatorChar);
}
// We have to ensure that the sub path ends with a directory separator otherwise we'll get weird results
// when the sub path matches a similar but in-complete subpath
if (!subPath.EndsWith(newDirectorySeparatorChar))
{
subPath += newDirectorySeparatorChar;
}
if (newSubPath.Contains(oldDirectorySeparatorChar, StringComparison.Ordinal))
{
newSubPath = newSubPath.Replace(oldDirectorySeparatorChar, newDirectorySeparatorChar);
}
if (!newSubPath.EndsWith(newDirectorySeparatorChar))
{
newSubPath += newDirectorySeparatorChar;
}
if (!path.Contains(subPath, StringComparison.OrdinalIgnoreCase))
{
newPath = null;
return false;
}
newPath = path.Replace(subPath, newSubPath, StringComparison.OrdinalIgnoreCase);
return true;
}
}
}
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