Chrome扩展程序：如何拦截请求的网址？ [英] Chrome Extension : How to intercept requested urls?

问题描述

如果扩展程序拦截任何请求的URL，以便在某些条件匹配的情况下拦截它，那么如何才能阻止它？

Firefox的类似问题

需要什么权限在manifest.json中设置？

解决方案

JavaScript代码：

以下示例说明如何阻止对www.evil.com的所有请求：

  chrome.webRequest.onBeforeRequest.addListener（
 function（details）{
 return {cancel：details.url.indexOf（：//www.evil.com/）！=  - 1}; 
}，
 {url：[< all_urls>]}，
 [blocking] 
）; 
  

以下示例以更高效的方式实现了相同的目标，因为请求不是针对www。 evil.com不需要传递给扩展名：

  chrome.webRequest.onBeforeRequest.addListener（
 function （详情）{
 return {cancel：true}; 
}，
 {url：[*：//www.evil.com/*]}，
 [ 阻塞] 
）; 
  

注册事件侦听器：

要为Web请求注册事件侦听器，可以使用通常的 addListener（）函数中的变体。除了指定回调函数之外，您还必须指定一个过滤器参数，并且您可以指定一个可选的额外信息参数。

Web请求API的addListener ）有以下定义：

  var callback = function（details）{...}; 
 var filter = {...}; 
 var opt_extraInfoSpec = [...]; 
  

以下是监听onBeforeRequest事件的示例：

  chrome.webRequest.onBeforeRequest.addListener（
 callback，filter，opt_extraInfoSpec）; 
  

manifest.json需要的权限：

 权限：[
webRequest，
webRequestBlocking，
标签，
 < all_urls> 中
]，
  

扩展程序示例和帮助链接 p>

• 扩展程序请求： https://chrome.google.com/webstore/detail/requestly/mdnleldcmiljblolnjhpnblkcekpdkpa


• 扩展Https-Everywhere： https://github.com/EFForg/https-everywhere


• 示例： https://github.com/blunderboy/requestly/blob/master/src/background/background .js


• Wiki： https： //code.google.com/p/html5security/wiki/RedirectionMethods


• Wiki： https://developer.chrome.com/extensions/webRequest

How can an extension intercept any requested URL to block it if some condition matches?

Similar question for Firefox.

What permission needs to be set in manifest.json?

解决方案

JavaScript Code :

The following example illustrates how to block all requests to www.evil.com:

chrome.webRequest.onBeforeRequest.addListener(
  function(details) {
    return {cancel: details.url.indexOf("://www.evil.com/") != -1};
  },
  { urls: ["<all_urls>"] },
  ["blocking"]
);

The following example achieves the same goal in a more efficient way because requests that are not targeted to www.evil.com do not need to be passed to the extension:

chrome.webRequest.onBeforeRequest.addListener(
  function(details) { 
    return { cancel: true }; 
  },
  {urls: ["*://www.evil.com/*"]},
  ["blocking"]
);

Registering event listeners:

To register an event listener for a web request, you use a variation on the usual addListener() function. In addition to specifying a callback function, you have to specify a filter argument and you may specify an optional extra info argument.

The three arguments to the web request API's addListener() have the following definitions:

var callback = function(details) {...};
var filter = {...};
var opt_extraInfoSpec = [...];

Here's an example of listening for the onBeforeRequest event:

chrome.webRequest.onBeforeRequest.addListener(
  callback, filter, opt_extraInfoSpec);

Permission needed on manifest.json :

"permissions": [
  "webRequest",
  "webRequestBlocking",
"tabs",
"<all_urls>"
],

Extensions examples and help links:

• Extension Requestly : https://chrome.google.com/webstore/detail/requestly/mdnleldcmiljblolnjhpnblkcekpdkpa
• Extension Https-Everywhere : https://github.com/EFForg/https-everywhere
• Example : https://github.com/blunderboy/requestly/blob/master/src/background/background.js
• Wiki : https://code.google.com/p/html5security/wiki/RedirectionMethods
• Wiki : https://developer.chrome.com/extensions/webRequest

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