76 lines
2.8 KiB
C#
76 lines
2.8 KiB
C#
using System.Net;
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using Microsoft.AspNetCore.Antiforgery;
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using Microsoft.Extensions.DependencyInjection;
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namespace Microsoft.AspNetCore.Http
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{
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/// <summary>
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/// Extensions for the <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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/// Retrieves the antiforgery token.
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/// </summary>
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/// <param name="httpContext">The current <see cref="HttpContext"/>.</param>
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/// <returns>Name and value of the token.</returns>
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public static (string Name, string Value) GetAntiforgeryToken(this HttpContext httpContext)
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{
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var af = httpContext.RequestServices.GetService<IAntiforgery>();
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var set = af?.GetAndStoreTokens(httpContext);
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return (Name: set?.FormFieldName, Value: set?.RequestToken);
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}
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/// <summary>
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/// Returns the remote ip address.
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/// </summary>
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/// <param name="httpContext">The current <see cref="HttpContext"/>.</param>
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/// <param name="headerName">The name of the header to resolve the <see cref="IPAddress"/> when behind a proxy (Default: X-Forwarded-For).</param>
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/// <returns>The ip address of the client.</returns>
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public static IPAddress GetRemoteIpAddress(this HttpContext httpContext, string headerName = "X-Forwarded-For")
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{
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var remote = httpContext.Connection.RemoteIpAddress;
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string forwardedHeader = httpContext.Request.Headers[headerName].ToString();
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if (!string.IsNullOrWhiteSpace(forwardedHeader) && IPAddress.TryParse(forwardedHeader, out var forwarded))
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return forwarded;
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return remote;
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}
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/// <summary>
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/// Returns whether the request was made locally.
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/// </summary>
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/// <param name="httpContext">The current <see cref="HttpContext"/>.</param>
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/// <param name="headerName">The name of the header to resolve the <see cref="IPAddress"/> when behind a proxy (Default: X-Forwarded-For).</param>
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/// <returns></returns>
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public static bool IsLocalRequest(this HttpContext httpContext, string headerName = "X-Forwarded-For")
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{
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var remoteIpAddress = httpContext.GetRemoteIpAddress(headerName);
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return httpContext.Connection.LocalIpAddress.Equals(remoteIpAddress);
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}
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/// <summary>
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/// Tries to retrieve the return url.
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/// </summary>
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/// <param name="httpContext">The current <see cref="HttpContext"/>.</param>
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/// <returns></returns>
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public static string GetReturnUrl(this HttpContext httpContext)
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{
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string url = httpContext.Items["OriginalRequest"]?.ToString();
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if (string.IsNullOrWhiteSpace(url))
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url = httpContext.Request.Query["ReturnUrl"].ToString();
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return url;
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}
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/// <summary>
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/// Clears a session when available.
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/// </summary>
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/// <param name="httpContext">The current <see cref="HttpContext"/>.</param>
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public static void ClearSession(this HttpContext httpContext)
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=> httpContext?.Session?.Clear();
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}
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}
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