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using System;
using System.Linq;
using System.Threading.Tasks;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.Configuration;
using Microsoft.AspNetCore.Http;
namespace Jellyfin.Server.Middleware
{
/// <summary>
/// Validates the LAN host IP based on application configuration.
/// </summary>
public class LanFilteringMiddleware
{
private readonly RequestDelegate _next;
/// <summary>
/// Initializes a new instance of the <see cref="LanFilteringMiddleware"/> class.
/// </summary>
/// <param name="next">The next delegate in the pipeline.</param>
public LanFilteringMiddleware(RequestDelegate next)
{
_next = next;
}
/// <summary>
/// Executes the middleware action.
/// </summary>
/// <param name="httpContext">The current HTTP context.</param>
/// <param name="networkManager">The network manager.</param>
/// <param name="serverConfigurationManager">The server configuration manager.</param>
/// <returns>The async task.</returns>
public async Task Invoke(HttpContext httpContext, INetworkManager networkManager, IServerConfigurationManager serverConfigurationManager)
{
var currentHost = httpContext.Request.Host.ToString();
var hosts = serverConfigurationManager
.Configuration
.LocalNetworkAddresses
.Select(NormalizeConfiguredLocalAddress)
.ToList();
if (hosts.Count == 0)
{
await _next(httpContext).ConfigureAwait(false);
return;
}
currentHost ??= string.Empty;
if (networkManager.IsInPrivateAddressSpace(currentHost))
{
hosts.Add("localhost");
hosts.Add("127.0.0.1");
if (hosts.All(i => currentHost.IndexOf(i, StringComparison.OrdinalIgnoreCase) == -1))
{
return;
}
}
await _next(httpContext).ConfigureAwait(false);
}
private static string NormalizeConfiguredLocalAddress(string address)
{
var add = address.AsSpan().Trim('/');
int index = add.IndexOf('/');
if (index != -1)
{
add = add.Slice(index + 1);
}
return add.TrimStart('/').ToString();
}
}
}
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