/// <summary>
/// Gets the filesystem-relative path of a full path or of an URL.
/// </summary>
/// <param name="fullPathOrUrl">The full path or URL.</param>
/// <returns>The path, relative to this filesystem's root.</returns>
/// <remarks>
/// <para>The relative path is relative to this filesystem's root, not starting with any
/// directory separator. All separators are forward-slashes.</para>
/// </remarks>
public string GetRelativePath(string fullPathOrUrl)
{
// test URL
var path = fullPathOrUrl.Replace('\\', '/'); // ensure URL separator char
// if it starts with the root path, strip it and trim the starting slash to make it relative
// eg "c:/websites/test/root/Media/1234/img.jpg" => "1234/img.jpg"
// or on unix systems "/var/wwwroot/test/Meia/1234/img.jpg"
if (_ioHelper.PathStartsWith(path, _rootPathFwd, '/'))
{
return(path.Substring(_rootPathFwd.Length).TrimStart(Constants.CharArrays.ForwardSlash));
}
// if it starts with the root URL, strip it and trim the starting slash to make it relative
// eg "/Media/1234/img.jpg" => "1234/img.jpg"
if (_ioHelper.PathStartsWith(path, _rootUrl, '/'))
{
return(path.Substring(_rootUrl.Length).TrimStart(Constants.CharArrays.ForwardSlash));
}
// unchanged - what else?
return(path.TrimStart(Constants.CharArrays.ForwardSlash));
}