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