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using System.Net;
using MediaBrowser.Common.Net;
using Microsoft.AspNetCore.Http;
namespace MediaBrowser.Common.Extensions
{
/// <summary>
/// Static class containing extension methods for <see cref="HttpContext"/>.
/// </summary>
public static class HttpContextExtensions
{
/// <summary>
/// Checks the origin of the HTTP request.
/// </summary>
/// <param name="request">The incoming HTTP request.</param>
/// <returns><c>true</c> if the request is coming from LAN, <c>false</c> otherwise.</returns>
public static bool IsLocal(this HttpRequest request)
{
return (request.HttpContext.Connection.LocalIpAddress == null
&& request.HttpContext.Connection.RemoteIpAddress == null)
|| request.HttpContext.Connection.LocalIpAddress.Equals(request.HttpContext.Connection.RemoteIpAddress);
}
/// <summary>
/// Extracts the remote IP address of the caller of the HTTP request.
/// </summary>
/// <param name="request">The HTTP request.</param>
/// <returns>The remote caller IP address.</returns>
public static string RemoteIp(this HttpRequest request)
{
var cachedRemoteIp = request.HttpContext.Items["RemoteIp"].ToString();
if (string.IsNullOrEmpty(cachedRemoteIp))
{
return cachedRemoteIp;
}
IPAddress ip;
// "Real" remote ip might be in X-Forwarded-For of X-Real-Ip
// (if the server is behind a reverse proxy for example)
if (!IPAddress.TryParse(request.Headers[CustomHeaderNames.XForwardedFor].ToString(), out ip))
{
if (!IPAddress.TryParse(request.Headers[CustomHeaderNames.XRealIP].ToString(), out ip))
{
ip = request.HttpContext.Connection.RemoteIpAddress;
// Default to the loopback address if no RemoteIpAddress is specified (i.e. during integration tests)
ip ??= IPAddress.Loopback;
}
}
if (ip.IsIPv4MappedToIPv6)
{
ip = ip.MapToIPv4();
}
var normalizedIp = ip.ToString();
request.HttpContext.Items["RemoteIp"] = normalizedIp;
return normalizedIp;
}
}
}
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