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using FastGithub.Configuration;
using FastGithub.DomainResolve;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Security;
using System.Net.Sockets;
using System.Security.Cryptography.X509Certificates;
using System.Threading;
using System.Threading.Tasks;
namespace FastGithub.Http
{
/// <summary>
/// HttpClientHandler
/// </summary>
class HttpClientHandler : DelegatingHandler
{
private readonly DomainConfig domainConfig;
private readonly IDomainResolver domainResolver;
/// <summary>
/// HttpClientHandler
/// </summary>
/// <param name="domainConfig"></param>
/// <param name="domainResolver"></param>
public HttpClientHandler(DomainConfig domainConfig, IDomainResolver domainResolver)
{
this.domainResolver = domainResolver;
this.domainConfig = domainConfig;
this.InnerHandler = this.CreateSocketsHttpHandler();
}
/// <summary>
/// 替换域名为ip
/// </summary>
/// <param name="request"></param>
/// <param name="cancellationToken"></param>
/// <returns></returns>
protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
var uri = request.RequestUri;
if (uri == null)
{
throw new FastGithubException("必须指定请求的URI");
}
// 请求上下文信息
var context = new RequestContext
{
Domain = uri.Host,
IsHttps = uri.Scheme == Uri.UriSchemeHttps,
TlsSniPattern = this.domainConfig.GetTlsSniPattern().WithDomain(uri.Host).WithRandom()
};
request.SetRequestContext(context);
// 解析ip，替换https为http
var uriBuilder = new UriBuilder(uri)
{
Scheme = Uri.UriSchemeHttp
};
if (uri.HostNameType == UriHostNameType.Dns)
{
if (IPAddress.TryParse(this.domainConfig.IPAddress, out var address) == false)
{
var endPoint = new DnsEndPoint(uri.Host, uri.Port);
address = await this.domainResolver.ResolveAsync(endPoint, cancellationToken);
}
uriBuilder.Host = address.ToString();
request.Headers.Host = context.Domain;
context.TlsSniPattern = context.TlsSniPattern.WithIPAddress(address);
}
request.RequestUri = uriBuilder.Uri;
if (this.domainConfig.Timeout != null)
{
using var timeoutTokenSource = new CancellationTokenSource(this.domainConfig.Timeout.Value);
using var linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, timeoutTokenSource.Token);
return await base.SendAsync(request, linkedTokenSource.Token);
}
else
{
return await base.SendAsync(request, cancellationToken);
}
}
/// <summary>
/// 创建转发代理的httpHandler
/// </summary>
/// <returns></returns>
private SocketsHttpHandler CreateSocketsHttpHandler()
{
return new SocketsHttpHandler
{
Proxy = null,
UseProxy = false,
UseCookies = false,
AllowAutoRedirect = false,
AutomaticDecompression = DecompressionMethods.None,
ConnectCallback = async (context, cancellationToken) =>
{
var socket = new Socket(SocketType.Stream, ProtocolType.Tcp);
await socket.ConnectAsync(context.DnsEndPoint, cancellationToken);
var stream = new NetworkStream(socket, ownsSocket: true);
var requestContext = context.InitialRequestMessage.GetRequestContext();
if (requestContext.IsHttps == false)
{
return stream;
}
var sslStream = new SslStream(stream, leaveInnerStreamOpen: false);
await sslStream.AuthenticateAsClientAsync(new SslClientAuthenticationOptions
{
TargetHost = requestContext.TlsSniPattern.Value,
RemoteCertificateValidationCallback = ValidateServerCertificate
}, cancellationToken);
return sslStream;
bool ValidateServerCertificate(object sender, X509Certificate? cert, X509Chain? chain, SslPolicyErrors errors)
{
if (errors.HasFlag(SslPolicyErrors.RemoteCertificateNameMismatch))
{
if (this.domainConfig.TlsIgnoreNameMismatch == true)
{
return true;
}
var domain = requestContext.Domain;
var dnsNames = ReadDnsNames(cert);
return dnsNames.Any(dns => IsMatch(dns, domain));
}
return errors == SslPolicyErrors.None;
}
}
};
}
/// <summary>
/// 读取使用的DNS名称
/// </summary>
/// <param name="cert"></param>
/// <returns></returns>
private static IEnumerable<string> ReadDnsNames(X509Certificate? cert)
{
if (cert == null)
{
yield break;
}
var parser = new Org.BouncyCastle.X509.X509CertificateParser();
var x509Cert = parser.ReadCertificate(cert.GetRawCertData());
var subjects = x509Cert.GetSubjectAlternativeNames();
foreach (var subject in subjects)
{
if (subject is IList list)
{
if (list.Count >= 2 && list[0] is int nameType && nameType == 2)
{
var dnsName = list[1]?.ToString();
if (dnsName != null)
{
yield return dnsName;
}
}
}
}
}
/// <summary>
/// 比较域名
/// </summary>
/// <param name="dnsName"></param>
/// <param name="domain"></param>
/// <returns></returns>
private static bool IsMatch(string dnsName, string? domain)
{
if (domain == null)
{
return false;
}
if (dnsName == domain)
{
return true;
}
if (dnsName[0] == '*')
{
return domain.EndsWith(dnsName[1..]);
}
return false;
}
}
}