如何给selenium.chrome写扩展拦截或转发请求

Posted 2022-08-03 格格巫 MMQ!!

Selenium WebDriver 是一组开源 API，用于自动测试 Web 应用程序，利用它可以通过代码来控制chrome浏览器！

有时候我们需要mock接口的返回，或者拦截和转发请求，今天就来实现这个功能

代码已开源： https://github.com/yuzd/OpenQA.Selenium.Chrome.Fiddler

nuget
OpenQA.Selenium.Chrome.Fiddler

开始coding
我们新创建一个功能：OpenQA.Selenium.Chrome.Fiddler

一个chrome扩展 最起码有2个文件

manifest.json
background.js
稍微解释一下：

manifest.json 是来描述chrome扩展的

“version”: “1.0.0”,
“manifest_version”: 2,
“name”: “Chrome Fiddler”,
“permissions”: [
“proxy”,
“tabs”,
“unlimitedStorage”,
“storage”,
“<all_urls>”,
“webRequest”,
“webRequestBlocking”
],
“background”:
“scripts”: [“background.js”]
,
“minimum_chrome_version”:“22.0.0”

background.js 是逻辑处理模块
因为拦截api 或者 转发 需要用的chrome的api

chrome.webRequest.onBeforeRequest.addListener(
function(details)
//逻辑处理
,
urls: [‘<all_urls>’],
[‘blocking’, ‘extraHeaders’, ‘requestBody’]
);
这个api的函数 接收的details参数

details.url 是api的接口
函数的返回

cancel:true 拦截请求
redirectUrl:‘’ 转发到指定url
写selenium.chrome插件
新建一个netstand工程，然后引用

Selenium.WebDriver
复制以下代码

///
/// Add Fiddler extention
///
/// Chrome options
/// Proxy host
public static void AddFiddler(this ChromeOptions options, FiddlerOption fiddlerOption)

var backgroundProxyJs = ReplaceTemplates(background_js, fiddlerOption);

if (!Directory.Exists("Plugins"))
    Directory.CreateDirectory("Plugins");

var guid = Guid.NewGuid().ToString();

var manifestPath = $"Plugins/manifest_guid.json";
var backgroundPath = $"Plugins/background_guid.js";
var archiveFilePath = $"Plugins/proxy_auth_plugin_guid.zip";

File.WriteAllText(manifestPath, manifest_json);
File.WriteAllText(backgroundPath, backgroundProxyJs);

using (var zip = ZipFile.Open(archiveFilePath, ZipArchiveMode.Create))

    zip.CreateEntryFromFile(manifestPath, "manifest.json");
    zip.CreateEntryFromFile(backgroundPath, "background.js");


File.Delete(manifestPath);
File.Delete(backgroundPath);

options.AddExtension(archiveFilePath);

private static string ReplaceTemplates(string str, FiddlerOption fiddlerOption)

if (fiddlerOption.OnBeforeRequestOptions != null)

var beforeConfigs = Newtonsoft.Json.JsonConvert.SerializeObject(fiddlerOption.OnBeforeRequestOptions);
str = str.Replace(“before_configs”, beforeConfigs);

return str;

上面的代码主要是创建一个chrome扩展zip包

然后再selenium.chrome启动的时候传进去这个zip包的地址

使用方法
var driverBinary = @“D:\\soft\\chrome\\chrome2\\Chrome-bin”;

ChromeOptions options = new ChromeOptions

BinaryLocation = Path.Combine(driverBinary, “chrome.exe”)
;

Environment.SetEnvironmentVariable(“webdriver.chrome.driver”, driverBinary);
options.AddArgument(“–disable-blink-features=AutomationControlled”);
options.AddArguments(“–disable-infobars”);
List ls = new List “enable-automation” ;
options.AddExcludedArguments(ls);

#region Fillder

options.AddFiddler(new FiddlerOption

OnBeforeRequestOptions = new List

// 配置转发
new FiddlerOnBeforeRequestOptions

Match = “https://www.cnblogs.com/yudongdong/ajax/GetPostStat”,//正则
RedirectUrl = “http://localhost:5000/GetPostStat”,//如果匹配成功则将requestBody转发到这个url中去
Cancel = false//如果配置了cancel=true那么转发将无效，true的意思是直接拦截这次的请求,不去发送了
,
// 配置拦截
new FiddlerOnBeforeRequestOptions

Match = “https://www.cnblogs.com/yudongdong/ajax/blogStats”,
Cancel = true//true的意思是直接拦截这次的请求,不去发送了
,

);

#endregion

var chrome = new ChromeDriver(driverBinary, options);

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