selenium.chrome怎么写扩展拦截或转发请求？

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

/// <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 Fillderoptions.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},}});#endregionvar chrome = new ChromeDriver(driverBinary, options);

实现效果