Firefox扩展：拦截它所请求和有条件的网址

问题描述

在firefox扩展中，我想拦截url浏览器正在请求和完全阻止请求，如果一些条件匹配

我如何拦截URL被请求

你可以看看这些插件的源代码。

解决方案

https://addons.mozilla.org/en-us/firefox/addon/blocksite/?src=search> https://addons.mozilla.org/en-us/firefox/addon/blocksite/ ？src = search

或者使用服务观察者来处理 nsIHTTPChannel 来快速处理

$ $ p $ $ codeonst $ { Ci，Cu，Cc，Cr} = require（'chrome'）; // const {interfaces：Ci，utils：Cu，classes：Cc，results：Cr} = Components;
Cu.import（'resource：//gre/modules/Services.jsm'）;
Cu.import（'resource：//gre/modules/devtools/Console.jsm'）;

var observers = {
'http-on-modify-request'：{
observe：function（aSubject，aTopic，aData）{
console.info 'http-on-modify-request：aSubject ='+ aSubject +'| aTopic ='+ aTopic +'| aData ='+ aData）;
var httpChannel = aSubject.QueryInterface（Ci.nsIHttpChannel）;
var requestUrl = httpChannel.URI.spec
if（requestUrl.indexOf（'google.com'）> -1）{
//httpChannel.cancel(Cr.NS_BINDING_ABORTED）; //取消加载
httpChannel.redirectTo（Services.io.newURI（'data：text，url_blocked'，null，null））; //可以重定向到这一行，如果不想重定向然后阻塞，那么取消注释这一行并注释掉上面的行（第17行）


reg： {
Services.obs.addObserver（观察者['http-on-modify-request']，'http-on-modify-request'，false）;
}，
unreg：function（）{
Services.obs.removeObserver（observers ['http-on-modify-request']，'http-on-modify-request'）;
}
}
};

开始观察

观察所有的请求（例如在你的插件启动时）

  for（var o in observers）{
观察员[O]的.reg（）; 
 
 
 
 
 
 
停止观察
 
 
 
重要的是停止观察（确保至少在关闭插件时运行这个，你不想离开观察者注册内存的原因）
 
 
  for（var o in observers）{
 observers [o] .unreg（）; 
 
 
 
 $ b $ p 
 $ b 
阻止/重定向url的观察者服务的完整工作示例： 
 
in firefox extension I want to intercept the url browser is making request to and block the request entirely if some condition matches

how can I intercept URL being requested
 解决方案 
you can have a look at the source of those addons 

https://addons.mozilla.org/en-us/firefox/addon/blocksite/?src=search
https://addons.mozilla.org/en-us/firefox/addon/url-n-extension-blockune-bl/?src=search

or use service observer with nsIHTTPChannel for fast handling
const { Ci, Cu, Cc, Cr } = require('chrome'); //const {interfaces: Ci, utils: Cu, classes: Cc, results: Cr } = Components;
Cu.import('resource://gre/modules/Services.jsm');
Cu.import('resource://gre/modules/devtools/Console.jsm');

var observers = {
    'http-on-modify-request': {
        observe: function (aSubject, aTopic, aData) {
            console.info('http-on-modify-request: aSubject = ' + aSubject + ' | aTopic = ' + aTopic + ' | aData = ' + aData);
            var httpChannel = aSubject.QueryInterface(Ci.nsIHttpChannel);
            var requestUrl = httpChannel.URI.spec
            if (requestUrl.indexOf('google.com') > -1) {
               //httpChannel.cancel(Cr.NS_BINDING_ABORTED); //this aborts the load
               httpChannel.redirectTo(Services.io.newURI('data:text,url_blocked', null, null)); //can redirect with this line, if dont want to redirect and just block, then uncomment this line and comment out line above (line 17)
            }
        },
        reg: function () {
            Services.obs.addObserver(observers['http-on-modify-request'], 'http-on-modify-request', false);
        },
        unreg: function () {
            Services.obs.removeObserver(observers['http-on-modify-request'], 'http-on-modify-request');
        }
    }
};
To start observing
To start start obseving all requests do this (for example on startup of your addon)
for (var o in observers) {
    observers[o].reg();
}
To stop observing
Its important to stop observring (make sure to run this at least on shutdown of addon, you dont want to leave the observer registered for memory reasons)
for (var o in observers) {
    observers[o].unreg();
}
Full working example of the observer service to block/redirect urls: https://github.com/Noitidart/PortableTester/tree/block-urls
                        
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