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using System.Linq;
using System.Threading.Tasks;
using MediaBrowser.Common.Extensions;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.Configuration;
using Microsoft.AspNetCore.Http;
namespace Jellyfin.Server.Middleware
{
/// <summary>
/// Validates the IP of requests coming from local networks wrt. remote access.
/// </summary>
public class IpBasedAccessValidationMiddleware
{
private readonly RequestDelegate _next;
/// <summary>
/// Initializes a new instance of the <see cref="IpBasedAccessValidationMiddleware"/> class.
/// </summary>
/// <param name="next">The next delegate in the pipeline.</param>
public IpBasedAccessValidationMiddleware(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)
{
if (httpContext.Request.IsLocal())
{
await _next(httpContext).ConfigureAwait(false);
return;
}
var remoteIp = httpContext.Request.RemoteIp();
if (serverConfigurationManager.Configuration.EnableRemoteAccess)
{
var addressFilter = serverConfigurationManager.Configuration.RemoteIPFilter.Where(i => !string.IsNullOrWhiteSpace(i)).ToArray();
if (addressFilter.Length > 0 && !networkManager.IsInLocalNetwork(remoteIp))
{
if (serverConfigurationManager.Configuration.IsRemoteIPFilterBlacklist)
{
if (networkManager.IsAddressInSubnets(remoteIp, addressFilter))
{
return;
}
}
else
{
if (!networkManager.IsAddressInSubnets(remoteIp, addressFilter))
{
return;
}
}
}
}
else
{
if (!networkManager.IsInLocalNetwork(remoteIp))
{
return;
}
}
await _next(httpContext).ConfigureAwait(false);
}
}
}
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