// Copyright © 2012 The CefSharp Authors. All rights reserved.

//

// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.

using System;

using System.Threading.Tasks;

using CefSharp.Handler;

namespace CefSharp.Example.Handlers

{

/// <summary>

/// <see cref="RequestHandler"/> provides a base class for you to inherit from

/// you only need to implement the methods that are relevant to you.

/// If you implement the IRequestHandler interface you will need to

/// implement every method

/// </summary>

public class ExampleRequestHandler : RequestHandler

{

public static readonly string VersionNumberString = String.Format("Chromium: {0}, CEF: {1}, CefSharp: {2}",

Cef.ChromiumVersion, Cef.CefVersion, Cef.CefSharpVersion);

protected override bool OnBeforeBrowse(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool userGesture, bool isRedirect)

{

return false;

}

protected override bool OnOpenUrlFromTab(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, string targetUrl, WindowOpenDisposition targetDisposition, bool userGesture)

{

return false;

}

protected override bool OnCertificateError(IWebBrowser chromiumWebBrowser, IBrowser browser, CefErrorCode errorCode, string requestUrl, ISslInfo sslInfo, IRequestCallback callback)

{

//NOTE: We also suggest you wrap callback in a using statement or explicitly execute callback.Dispose as callback wraps an unmanaged resource.

//Example #1

//Return true and call IRequestCallback.Continue() at a later time to continue or cancel the request.

//In this instance we'll use a Task, typically you'd invoke a call to the UI Thread and display a Dialog to the user

//You can cast the IWebBrowser param to ChromiumWebBrowser to easily access

//control, from there you can invoke onto the UI thread, should be in an async fashion

Task.Run(() =>

{

//NOTE: When executing the callback in an async fashion need to check to see if it's disposed

if (!callback.IsDisposed)

{

using (callback)

{

//We'll allow the expired certificate from badssl.com

if (requestUrl.ToLower().Contains("https://expired.badssl.com/"))

{

callback.Continue(true);

}

else

{

callback.Continue(false);

}

}

}

});

return true;

//Example #2

//Execute the callback and return true to immediately allow the invalid certificate

//callback.Continue(true); //Callback will Dispose it's self once exeucted

//return true;

//Example #3

//Return false for the default behaviour (cancel request immediately)

//callback.Dispose(); //Dispose of callback

//return false;

}

protected override bool GetAuthCredentials(IWebBrowser chromiumWebBrowser, IBrowser browser, string originUrl, bool isProxy, string host, int port, string realm, string scheme, IAuthCallback callback)

{

//NOTE: We also suggest you explicitly Dispose of the callback as it wraps an unmanaged resource.

//Example #1

//Spawn a Task to execute our callback and return true;

//Typical usage would see you invoke onto the UI thread to open a username/password dialog

//Then execute the callback with the response username/password

//You can cast the IWebBrowser param to ChromiumWebBrowser to easily access

//control, from there you can invoke onto the UI thread, should be in an async fashion

//Load https://httpbin.org/basic-auth/cefsharp/passwd in the browser to test

Task.Run(() =>

{

using (callback)

{

if (originUrl.Contains("https://httpbin.org/basic-auth/"))

{

var parts = originUrl.Split('/');

var username = parts[parts.Length - 2];

var password = parts[parts.Length - 1];

callback.Continue(username, password);

}

}

});

return true;

//Example #2

//Return false to cancel the request

//callback.Dispose();

//return false;

}

protected override void OnRenderProcessTerminated(IWebBrowser chromiumWebBrowser, IBrowser browser, CefTerminationStatus status, int errorCode, string errorMessage)

{

// TODO: Add your own code here for handling scenarios where the Render Process terminated for one reason or another.

chromiumWebBrowser.Load(CefExample.RenderProcessCrashedUrl);

}

protected override IResourceRequestHandler GetResourceRequestHandler(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool isNavigation, bool isDownload, string requestInitiator, ref bool disableDefaultHandling)

{

//NOTE: In most cases you examine the request.Url and only handle requests you are interested in

if (request.Url.ToLower().StartsWith("https://cefsharp.example")

|| request.Url.ToLower().StartsWith(CefSharpSchemeHandlerFactory.SchemeName)

|| request.Url.ToLower().StartsWith("mailto:")

|| request.Url.ToLower().StartsWith("https://googlechrome.github.io/samples/service-worker/"))

{

return new ExampleResourceRequestHandler();

}

return null;

}

}

}