using System;
using System.IO;
using System.Security.Permissions;

namespace AspClassic.Scripting;

[Serializable]
internal sealed class FileStreamContentProvider : StreamContentProvider
{
	[Serializable]
	private class PALHolder : MarshalByRefObject
	{
		[NonSerialized]
		private readonly PlatformAdaptationLayer _pal;

		internal PALHolder(PlatformAdaptationLayer pal)
		{
			_pal = pal;
		}

		internal Stream GetStream(string path)
		{
			return _pal.OpenInputFileStream(path);
		}

		[SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.Infrastructure)]
		public override object InitializeLifetimeService()
		{
			return null;
		}
	}

	private readonly string _path;

	private readonly PALHolder _pal;

	internal string Path => _path;

	internal FileStreamContentProvider(PlatformAdaptationLayer pal, string path)
	{
		_path = path;
		_pal = new PALHolder(pal);
	}

	public override Stream GetStream()
	{
		return _pal.GetStream(Path);
	}
}