CEFSharp拦截一切网站的WSS完整代码WinForm
CEFSharp是一个开源项目，它是Chromium Embedded Framework (CEF) 的.NET包装器，允许开发者在Windows Forms或WPF应用中嵌入Chromium浏览器引擎。CEFSharp提供了丰富的API，用于创建自定义的浏览器控件，实现与网页的交互以及对网页内容的控制。在本示例中，我们将探讨如何使用CEFSharp在WinForm应用中拦截并处理WebSocket连接。
WebSocket是一种在客户端和服务器之间建立持久连接的协议，常用于实时通信场景。在CEFSharp中，我们可以通过重写特定的生命周期方法来拦截WebSocket通信。
我们需要在项目中引用CEFSharp的相关库，包括`CEFSharp.WinForms`和`CEFSharp.Core`。安装NuGet包管理器中的CEFSharp包可以轻松完成这一步。
接下来，创建一个继承自`ChromiumWebBrowser`的自定义类，如`CustomChromiumWebBrowser`。这个类将作为我们的浏览器控件，并且我们将在这里实现WebSocket拦截功能：
```csharp
public class CustomChromiumWebBrowser : ChromiumWebBrowser
{
public CustomChromiumWebBrowser()
{
WebSocketHandler = new WebSocketInterceptor();
}
public WebSocketInterceptor WebSocketHandler { get; set; }
protected override void OnBeforeBrowse(CefBrowser browser, CefFrame frame, CefRequest request, bool userGesture, bool isRedirect)
{
if (request.Method.ToLower() == "upgrade" && request.SchemeName.ToLower() == "ws")
{
WebSocketHandler.Intercept(frame, request);
}
base.OnBeforeBrowse(browser, frame, request, userGesture, isRedirect);
}
}
```
在`OnBeforeBrowse`方法中，我们检查请求是否为WebSocket升级请求（HTTP Upgrade请求，方法为"Upgrade"，协议为"ws"）。如果是，我们就调用`WebSocketHandler`的`Intercept`方法来处理该请求。
为了实现`WebSocketInterceptor`，我们需要创建一个新的类，它包含拦截逻辑：
```csharp
public class WebSocketInterceptor : CefResourceHandler
{
private readonly CefFrame _frame;
private readonly CefRequest _request;
public WebSocketInterceptor(CefFrame frame, CefRequest request)
{
_frame = frame;
_request = request;
}
public override bool ProcessRequest(CefRequest request, ICallback callback)
{
// 在这里可以进行额外的请求处理，如记录、修改或阻止请求
callback.Continue(); // 继续处理请求
return true;
}
public override void GetResponseHeaders(CefResponse response, out long responseLength, out string redirectUrl)
{
// 设置响应头，模拟WebSocket响应
response.Status = 101;
response.StatusText = "Switching Protocols";
response.MimeType = "text/html";
responseLength = 0;
redirectUrl = string.Empty;
}
public override Stream GetResponseStream()
{
// 如果需要返回自定义的响应数据，可以在这里创建并返回一个Stream对象
return null;
}
public override bool ReadResponse(Stream dataOut, int bytesToRead, out int bytesRead, ICallback callback)
{
bytesRead = 0;
return false; // 表示没有更多数据
}
public override bool CanGetCookie(CefCookie cookie)
{
return true;
}
public override bool CanSetCookie(CefCookie cookie)
{
return true;
}
}
```
`WebSocketInterceptor`实现了`CefResourceHandler`接口，让我们有机会在请求发送到服务器之前对其进行处理。`ProcessRequest`方法是主要的拦截点，我们可以在此处记录请求信息，甚至修改请求或阻止其继续。`GetResponseHeaders`和`GetResponseStream`方法则用于构建和返回模拟的WebSocket响应。
在WinForm应用中，只需实例化`CustomChromiumWebBrowser`并设置其`Address`属性，即可加载指定的网站。由于我们已经重写了`OnBeforeBrowse`，所以任何尝试建立WebSocket连接的请求都会被拦截。
这个示例展示了如何使用CEFSharp在WinForm应用中创建一个自定义的浏览器控件，该控件能够拦截并处理WebSocket请求。通过这种方式，开发者可以对WebSocket通信进行监控、调试，或者实现特定的功能，如数据过滤、日志记录等。
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