selenium chrome扩展拦截转发请求

时间:2022-09-28 正东人气:0

Selenium.WebDriver

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

/// <summary>
/// Add Fiddler extention
/// </summary>
/// <param name="options">Chrome options</param>
/// <param name="fiddlerOption">Proxy host</param>
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<string> ls = new List<string> { "enable-automation" };
options.AddExcludedArguments(ls);
#region Fillder
options.AddFiddler(new FiddlerOption
{
    OnBeforeRequestOptions = new List<FiddlerOnBeforeRequestOptions>
    {
        // 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);

实现效果

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