81 lines
3.2 KiB
C#
81 lines
3.2 KiB
C#
using System;
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using System.Net;
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using Microsoft.AspNetCore.Http;
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using Microsoft.AspNetCore.HttpOverrides;
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using IPNetwork = Microsoft.AspNetCore.HttpOverrides.IPNetwork;
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namespace Microsoft.AspNetCore.Builder
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{
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/// <summary>
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/// Extensions for the <see cref="IApplicationBuilder"/>.
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/// </summary>
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[System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
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public static class ApplicationBuilderExtensions
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{
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/// <summary>
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/// Adds settings to run behind a reverse proxy (e.g. NginX).
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/// </summary>
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/// <remarks>
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/// A base path (e.g. running in a sub-directory /app) for the application can be defined via <c>ASPNETCORE_APPL_PATH</c> environment variable.
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/// <br/>
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/// <br/>
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/// Additionally you can specify the proxy server by using <paramref name="address"/> or a <paramref name="network"/> when there are multiple proxy servers.
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/// <br/>
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/// When neither <paramref name="address"/> nor <paramref name="network"/> is set, the default subnets are configured:
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/// <list type="bullet">
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/// <item><c>127.0.0.0/8</c></item>
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/// <item><c>::1/128</c></item>
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///
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/// <item><c>10.0.0.0/8</c></item>
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/// <item><c>172.16.0.0/12</c></item>
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/// <item><c>192.168.0.0/16</c></item>
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/// <item><c>fd00::/8</c></item>
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/// </list>
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/// </remarks>
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/// <param name="app">The application builder.</param>
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/// <param name="network">The <see cref="IPNetwork"/> where proxy requests are received from (optional).</param>
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/// <param name="address">The <see cref="IPAddress"/> where proxy requests are received from (optional).</param>
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/// <param name="basePath">A custom base path (optional, <c>ASPNETCORE_APPL_PATH</c> is prefererred).</param>
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public static IApplicationBuilder UseProxyHosting(this IApplicationBuilder app, IPNetwork network = null, IPAddress address = null, string basePath = null)
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{
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string path = Environment.GetEnvironmentVariable("ASPNETCORE_APPL_PATH");
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if (string.IsNullOrWhiteSpace(path))
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path = basePath;
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if (!string.IsNullOrWhiteSpace(path))
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app.UsePathBase(new PathString(path));
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var options = new ForwardedHeadersOptions { ForwardedHeaders = ForwardedHeaders.All };
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options.KnownProxies.Clear();
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options.KnownNetworks.Clear();
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if (network == null && address == null)
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{
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// localhost
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options.KnownNetworks.Add(new IPNetwork(IPAddress.Loopback, 8));
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options.KnownNetworks.Add(new IPNetwork(IPAddress.IPv6Loopback, 128));
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// private IPv4 networks
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// see https://en.wikipedia.org/wiki/Private_network#Private_IPv4_addresses
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options.KnownNetworks.Add(new IPNetwork(IPAddress.Parse("10.0.0.0"), 8));
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options.KnownNetworks.Add(new IPNetwork(IPAddress.Parse("172.16.0.0"), 12));
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options.KnownNetworks.Add(new IPNetwork(IPAddress.Parse("192.168.0.0"), 16));
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// private IPv6 networks
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// see https://en.wikipedia.org/wiki/Private_network#Private_IPv6_addresses
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options.KnownNetworks.Add(new IPNetwork(IPAddress.Parse("fd00::"), 8));
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}
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if (network != null)
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options.KnownNetworks.Add(network);
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if (address != null)
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options.KnownProxies.Add(address);
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app.UseForwardedHeaders(options);
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return app;
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}
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}
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}
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