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MainActivity.cs
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MainActivity.cs
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using System;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Net.Http;
using Android.App;
using Android.OS;
using Android.Widget;
using Java.Interop;
using Java.Security;
using Java.Security.Cert;
using Javax.Net.Ssl;
using Square.OkHttp;
using System.Threading.Tasks;
using System.Text;
namespace OkHttpRepro
{
[Activity(Label = "OkHttpRepro", MainLauncher = true, Icon = "@drawable/icon")]
public class MainActivity : Activity
{
Button downloadBtn;
Button clearBtn;
TextView result;
TextView status;
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
downloadBtn = FindViewById<Button>(Resource.Id.downloadButton);
clearBtn = FindViewById<Button>(Resource.Id.clearButton);
result = FindViewById<TextView>(Resource.Id.result);
status = FindViewById<TextView>(Resource.Id.status);
downloadBtn.Click += DownloadBtn_Click;
clearBtn.Click += Clear_Click;
}
private async void DownloadBtn_Click(object sender, EventArgs e)
{
//var handler = new NativeMessageHandler(false, true);
//var client = new HttpClient(handler);
var st = new Stopwatch();
//handler.DisableCaching = true;
st.Start();
try
{
//var url = "https://self-signed.badssl.com/"; // works
var url = "https://code4ward.ddns.net:54899/status"; // stream was reset: PROTOCOL_ERROR
var resp = await HttpGet(url);
result.Text = "Got the headers!";
status.Text = string.Format("HTTP {0}: {1}", (int)resp.StatusCode, resp.ReasonPhrase);
var sb = new StringBuilder();
foreach (var v in resp.Headers)
sb.AppendFormat("{0}: {1}\n", v.Key, String.Join(",", v.Value));
sb.AppendLine();
var stream = await resp.Content.ReadAsStreamAsync();
var ms = new MemoryStream();
await stream.CopyToAsync(ms, 4096);
var bytes = ms.ToArray();
sb.Append($"Body has {bytes.Length} bytes.");
result.Text = sb.ToString();
}
catch (Exception ex)
{
result.Text = ex.ToString();
}
finally
{
st.Stop();
result.Text = (result.Text ?? "") + String.Format("\n\nTook {0} milliseconds", st.ElapsedMilliseconds);
}
}
private async Task<HttpResponseMessage> HttpGet(string url)
{
var client = new OkHttpClient();
client.SetHostnameVerifier(new HostnameVerifier());
client.SetSslSocketFactory(GetSocketFactory());
var builder = new Request.Builder()
.Method("GET", null)
.Url(url)
.CacheControl(new CacheControl.Builder().NoCache().Build())
.AddHeader("User-Agent", "Test/1.0");
var rq = builder.Build();
var call = client.NewCall(rq);
System.Diagnostics.Debug.WriteLine("Sending Call...");
var resp = await call.EnqueueAsync().ConfigureAwait(false);
System.Diagnostics.Debug.WriteLine("Got response");
var respBody = resp.Body();
var ret = new HttpResponseMessage((HttpStatusCode)resp.Code());
ret.ReasonPhrase = resp.Message();
if (respBody != null)
ret.Content = new StreamContent(respBody.ByteStream());
else
ret.Content = new ByteArrayContent(new byte[0]);
var respHeaders = resp.Headers();
foreach (var k in respHeaders.Names())
{
ret.Headers.TryAddWithoutValidation(k, respHeaders.Get(k));
ret.Content.Headers.TryAddWithoutValidation(k, respHeaders.Get(k));
}
return ret;
}
private void Clear_Click(object sender, EventArgs e)
{
result.Text = string.Empty;
}
private SSLSocketFactory GetSocketFactory()
{
// Create an SSLContext that uses our TrustManager
var context = SSLContext.GetInstance("TLSv1.2");
context.Init(null, new ITrustManager[] { new CustomX509TrustManager() }, null);
// return the final socket factory
return context.SocketFactory;
}
}
class HostnameVerifier : Java.Lang.Object, IHostnameVerifier
{
public bool Verify(string hostname, ISSLSession session)
{
System.Diagnostics.Debug.WriteLine("HostnameVerifier.Verify returns true");
return true;
}
}
public class CustomX509TrustManager : Java.Lang.Object, IX509TrustManager
{
private readonly IX509TrustManager defaultTrustManager;
public CustomX509TrustManager()
{
var algorithm = TrustManagerFactory.DefaultAlgorithm;
var defaultTrustManagerFactory = TrustManagerFactory.GetInstance(algorithm);
defaultTrustManagerFactory.Init((KeyStore)null);
var trustManagers = defaultTrustManagerFactory.GetTrustManagers();
defaultTrustManager = trustManagers[0].JavaCast<IX509TrustManager>();
}
public void CheckClientTrusted(Java.Security.Cert.X509Certificate[] chain, string authType)
{
// we are the client
}
public void CheckServerTrusted(Java.Security.Cert.X509Certificate[] certificates, string authType)
{
System.Diagnostics.Debug.WriteLine("In CustomX509TrustManager.CheckServerTrusted");
try
{
defaultTrustManager.CheckServerTrusted(certificates, authType);
System.Diagnostics.Debug.WriteLine($"defaultTrustManager trusted");
}
catch (CertificateException)
{
System.Diagnostics.Debug.WriteLine("defaultTrustManager did not trust");
System.Diagnostics.Debug.WriteLine("CustomX509TrustManager does (after some checks)");
}
}
Java.Security.Cert.X509Certificate[] IX509TrustManager.GetAcceptedIssuers()
{
return new Java.Security.Cert.X509Certificate[0];
}
}
public static class AwaitableOkHttp
{
public static Task<Response> EnqueueAsync(this Call This)
{
var cb = new OkTaskCallback();
This.Enqueue(cb);
return cb.Task;
}
class OkTaskCallback : Java.Lang.Object, ICallback
{
readonly TaskCompletionSource<Response> tcs = new TaskCompletionSource<Response>();
public Task<Response> Task { get { return tcs.Task; } }
public void OnFailure(Request p0, Java.IO.IOException p1)
{
// Kind of a hack, but the simplest way to find out that server cert. validation failed
if (p1.Message == String.Format("Hostname '{0}' was not verified", p0.Url().Host))
{
tcs.TrySetException(new WebException(p1.LocalizedMessage, WebExceptionStatus.TrustFailure));
}
else if (p1.Message.ToLowerInvariant().Contains("canceled"))
{
tcs.TrySetException(new System.OperationCanceledException());
}
else
{
tcs.TrySetException(new WebException(p1.Message));
}
}
public void OnResponse(Response p0)
{
tcs.TrySetResult(p0);
}
}
}
}