如何将chrome扩展挂钩到网络浏览器流量

时间:2018-05-17 09:41:54

标签: google-chrome-extension

我试图编写一个镀铬扩展程序来拦截网络流量并修改数据。

如果有人能告诉我我应该使用哪种API以及在哪里可以找到文档,我将不胜感激。

1 个答案:

答案 0 :(得分:5)

使用webRequest API并查看他们的events

创建一个包含权限activeTab的清单,以获取您所在的当前标签的权限,以及您希望为其启用扩展程序的url pattern。需要专门设置webRequestBlocking权限以阻止和修改流量。

的manifest.json

{
  "manifest_version": 2,
  "name": "network intercepter",
  "description": "intercept/modify/block data",
  "version": "1.0",

  "background": {
    "scripts": ["background.js"]
  },

  "permissions": [
    "activeTab",
    "https://*.google.com/*",
    "webRequest",
    "webRequestBlocking"
  ]
}

创建后台脚本并根据您要执行的操作开始添加webRequest侦听器。 This在做出这些选择时对我很有用。

background.js

var onBeforeSendHeadersListener = function(details) {
    // view request + headers to be send
    console.log(details);

    // block XMLHttpRequests by returning object with key "cancel"
    if (details.type == "xmlhttprequest") {
        return {
            cancel: true
        };
    }

    // modify the user agent of all script resources by changing the requestHeaders and then return an object with key "requestHeaders"
    if (details.type == "script") {
        for (var i = 0; i < details.requestHeaders.length; i++) {
            if (details.requestHeaders[i].name == "User-Agent") {
                details.requestHeaders[i].value = "I'm not a bot";
            }
        }
        return {
            "requestHeaders": details.requestHeaders
        };
    }
}


var onBeforeRequestListener = function(details) {
    // all images will now be loaded from this location instead
    // CAREFUL! CROSS ORIGIN REQUESTS WILL NOT BE BLOCKED WITH CHROME EXTENSIONS
    if (details.type == "image") {
        return {
            "redirectUrl": "https://foo.bar/image.jpg"
        };
    }
}


chrome.webRequest.onBeforeSendHeaders.addListener(onBeforeSendHeadersListener, {
    urls: ["https://*.google.com/*"]
}, ["requestHeaders", "blocking"]);

chrome.webRequest.onBeforeRequest.addListener(onBeforeRequestListener, {
    urls: ["https://*.google.com/*"]
}, ["requestBody", "blocking"]);

访问chrome:// extensions并打开后台页面,然后转到其控制台。然后通常访问https://google.com,您将看到所有图像都更改为新位置,XHR被阻止,脚本资源的用户代理已更改,在后台控制台中您将看到所做的请求