2019-06-24 20:54:51 +10:00
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// Copyright © 2019 The CefSharp Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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using System;
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2019-09-29 14:19:08 +10:00
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using System.IO;
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2019-06-24 20:54:51 +10:00
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using System.Text;
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using CefSharp.Example.Filters;
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using CefSharp.Handler;
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2019-12-10 18:29:15 +10:00
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using CefSharp.ResponseFilter;
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2019-06-24 20:54:51 +10:00
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namespace CefSharp.Example.Handlers
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{
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2019-09-29 14:28:32 +10:00
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/// <summary>
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/// ExampleResourceRequestHandler demonstrates some of the features you can perform
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/// using a <see cref="ResourceRequestHandler"/>
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/// </summary>
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/// <remarks>
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/// A <see cref="ResourceRequestHandler"/> represents a single resource request
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/// </remarks>
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2019-06-24 20:54:51 +10:00
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public class ExampleResourceRequestHandler : ResourceRequestHandler
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{
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private MemoryStream memoryStream;
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protected override CefReturnValue OnBeforeResourceLoad(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IRequestCallback callback)
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{
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Uri url;
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if (Uri.TryCreate(request.Url, UriKind.Absolute, out url) == false)
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{
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//If we're unable to parse the Uri then cancel the request
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// avoid throwing any exceptions here as we're being called by unmanaged code
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return CefReturnValue.Cancel;
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}
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//Example of how to set Referer
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// Same should work when setting any header
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// For this example only set Referer when using our custom scheme
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if (url.Scheme == CefSharpSchemeHandlerFactory.SchemeName)
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{
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//Referrer is now set using it's own method (was previously set in headers before)
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request.SetReferrer("http://google.com", ReferrerPolicy.Default);
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}
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//Example of setting User-Agent in every request.
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//var headers = request.Headers;
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//var userAgent = headers["User-Agent"];
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//headers["User-Agent"] = userAgent + " CefSharp";
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//request.Headers = headers;
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//NOTE: If you do not wish to implement this method returning false is the default behaviour
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// We also suggest you explicitly Dispose of the callback as it wraps an unmanaged resource.
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//callback.Dispose();
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//return false;
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//NOTE: When executing the callback in an async fashion need to check to see if it's disposed
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if (!callback.IsDisposed)
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{
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using (callback)
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{
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if (request.Method == "POST")
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{
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using (var postData = request.PostData)
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{
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if (postData != null)
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{
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var elements = postData.Elements;
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var charSet = request.GetCharSet();
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foreach (var element in elements)
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{
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if (element.Type == PostDataElementType.Bytes)
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{
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var body = element.GetBody(charSet);
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}
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}
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}
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}
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}
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//Note to Redirect simply set the request Url
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//if (request.Url.StartsWith("https://www.google.com", StringComparison.OrdinalIgnoreCase))
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//{
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// request.Url = "https://github.com/";
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//}
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//Callback in async fashion
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//callback.Continue(true);
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//return CefReturnValue.ContinueAsync;
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}
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}
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return CefReturnValue.Continue;
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}
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2019-07-20 16:26:25 +10:00
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protected override void OnResourceRedirect(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response, ref string newUrl)
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{
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//Example of how to redirect - need to check `newUrl` in the second pass
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//if (request.Url.StartsWith("https://www.google.com", StringComparison.OrdinalIgnoreCase) && !newUrl.Contains("github"))
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//{
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// newUrl = "https://github.com";
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//}
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}
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protected override bool OnProtocolExecution(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request)
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{
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return request.Url.StartsWith("mailto");
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}
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2019-07-20 16:26:25 +10:00
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protected override bool OnResourceResponse(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response)
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{
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//NOTE: You cannot modify the response, only the request
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// You can now access the headers
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//var headers = response.Headers;
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return false;
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}
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protected override IResponseFilter GetResourceResponseFilter(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response)
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{
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var url = new Uri(request.Url);
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if (url.Scheme == CefSharpSchemeHandlerFactory.SchemeName)
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{
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if (request.Url.Equals(CefExample.ResponseFilterTestUrl, StringComparison.OrdinalIgnoreCase))
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{
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return new FindReplaceResponseFilter("REPLACE_THIS_STRING", "This is the replaced string!");
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}
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if (request.Url.Equals("custom://cefsharp/assets/js/jquery.js", StringComparison.OrdinalIgnoreCase))
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{
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return new AppendResponseFilter(System.Environment.NewLine + "//CefSharp Appended this comment.");
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}
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//Only called for our customScheme
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2019-09-29 14:19:08 +10:00
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memoryStream = new MemoryStream();
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return new StreamResponseFilter(memoryStream);
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2019-06-24 20:54:51 +10:00
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}
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//return new PassThruResponseFilter();
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return null;
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}
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2019-07-20 16:26:25 +10:00
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protected override void OnResourceLoadComplete(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response, UrlRequestStatus status, long receivedContentLength)
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2019-06-24 20:54:51 +10:00
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{
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var url = new Uri(request.Url);
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2019-09-29 14:19:08 +10:00
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if (url.Scheme == CefSharpSchemeHandlerFactory.SchemeName && memoryStream != null)
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2019-06-24 20:54:51 +10:00
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{
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//TODO: Do something with the data here
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var data = memoryStream.ToArray();
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var dataLength = data.Length;
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//NOTE: You may need to use a different encoding depending on the request
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var dataAsUtf8String = Encoding.UTF8.GetString(data);
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2019-06-24 20:54:51 +10:00
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}
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}
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2020-05-02 08:50:16 +10:00
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protected override void Dispose()
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{
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memoryStream?.Dispose();
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memoryStream = null;
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base.Dispose();
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}
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2019-06-24 20:54:51 +10:00
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}
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}
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