nsITraceableChannel，拦截HTTP通信代码

问题描述

我一直试图让这个代码工作的Firefox，我从并从，我一直在寻找答案，没有运气。
我想要做的是截取某些链接，并改变它们。
欢迎任何帮助

我得到的错误是函数声明需要一个名字 witch指向 observe：function aSubject，aTopic，aData）部分代码

const Cc = Components.classes; const Ci = Components.interfaces; var observerService = Cc [@ mozilla.org/observer-service;1] .getService（Ci.nsIObserverService）; observerService.addObserver（httpRequestObserver，http-on- （）;）;} ----------------------- --------------------------------- var httpRequestObserver = {observe：function（aSubject，aTopic，aData）{if（ aTopic ==http-on-examine-response）{}}，QueryInterface：function（aIID）{如果（aIID.equals（Ci.nsIObserver）|| aIID.equals（Ci.nsISupports））{return this; }抛出Components.results.NS_NOINTERFACE; }} // ----------------------------------------------函数TracingListener（）{this.originalListener = null;} TracingListener.prototype = {onDataAvailable：function（request，context，inputStream，offset，count）{this.originalListener。 onDataAvailable（request，context，inputStream，offset，count）; }，onStartRequest：function（request，context）{this.originalListener.onStartRequest（request，context）; }，onStopRequest：function（request，context，statusCode）{this.originalListener.onStopRequest（request，context，statusCode）; }，QueryInterface：function（aIID）{if（aIID.equals（Ci.nsIStreamListener）|| aIID.equals（Ci.nsISupports））{return this; }抛出Components.results.NS_NOINTERFACE; }}观察：function（aSubject，aTopic，aData）{if（aTopic ==http-on-examine-response）{var newListener = new TracingListener（）; aSubject.QueryInterface（Ci.nsITraceableChannel）; newListener.originalListener = aSubject.setNewListener（newListener）; }} aSubject = aSubject.QueryInterface（Ci.nsIChannel）; var uri = aSubject.URI; //在任何其他解析器步骤之前请求的原始URI //和/或redirects.var ouri = aSubject.originalURI; ch = Services。 io.newChannel（https://google.com/，null，null）; console.log（ch.toString（））; //[xpconnect wrapped nsIChannel]ch.QueryInterface（Ci.nsITraceableChannel）; console.log（ch.toString（））; //[xpconnect wrapped（nsISupports，nsIChannel，nsITraceableChannel）]console.log（ch.ofCi.nsIUploadChannel）; // trueconsole.log（ch.toString（））; //[xpconnect wrapped（nsISupports，nsIChannel，nsITraceableChannel，nsIUploadChannel）]//变量ch被称为在这一点上实现了四个给定的接口

复制粘贴这个工作：
$ b $

b

  // const {classes：Cc，interfaces：Ci，utils：Cu，results：Cr} = Components; 
 // Cu.import（'resource：//gre/modules/Services.jsm'）; 
 
 Services.obs.addObserver（httpRequestObserver，http-on-examine-response，false）; 
 
 // Services.obs.removeObserver（httpRequestObserver，http-on-examine-response）; 
 // -------------------------------------------- ------------ 
 
 var httpRequestObserver = {
观察：函数（aSubject，aTopic，aData）{
 // if（aTopic == http-on-examine-response）{} //不需要这个，我们为http-on-examine-response添加了观察者，所以我们确实知道这只会触发`http-on-examine-response` 
 var newListener = new TracingListener（）; 
Subject.QueryInterface（Ci.nsITraceableChannel）; 
 newListener.originalListener = aSubject.setNewListener（newListener）; 
} 
 / * //这段代码的重点是什么？ 
，
 QueryInterface：function（aIID）{
 if（aIID.equals（Ci.nsIObserver）|| aIID.equals（Ci.nsISupports））{
 return this; 
} 
 throw Cr.NS_NOINTERFACE; 
} 
 * / 
} 
 
 // ------------------------ ------------------------------------ 
 
函数TracingListener（）{} 
 TracingListener.prototype = {
 onDataAvailable：function（request，context，inputStream，offset，count）{
 console.log（'data available'）; 
 this.originalListener.onDataAvailable（request，context，inputStream，offset，count）; 
}，
 onStartRequest：function（request，context）{
 this.originalListener.onStartRequest（request，context）; 
}，
 onStopRequest：function（request，context，statusCode）{
 this.originalListener.onStopRequest（request，context，statusCode）; 
}，
 QueryInterface：function（aIID）{
 if（aIID.equals（Ci.nsIStreamListener）|| aIID.equals（Ci.nsISupports））{
 return this; 
} 
 throw Cr.NS_NOINTERFACE; 
} 
} 
 
 //到底是什么？这不是一个对象的一部分？为什么观察结肠？ 
 / * 
观察：function（aSubject，aTopic，aData）{
 if（aTopic ==http-on-examine-response）{
 var newListener = new TracingListener （）; 
Subject.QueryInterface（Ci.nsITraceableChannel）; 
 newListener.originalListener = aSubject.setNewListener（newListener）; 
} 
} 
 * / 
 
 //这是什么垃圾？是应该在观察员？ 
 / * 
Subject = aSubject.QueryInterface（Ci.nsIChannel）; 
 var uri = aSubject.URI; 
 //在任何其他解析器步骤之前请求的原始URI 
 //和/或重定向。 
 var ouri = aSubject.originalURI; 
 
 ch = Services.io.newChannel（https://google.com/，null，null）; 
 console.log（ch.toString（））; 
 //[xpconnect wrapped nsIChannel]
 
 ch.QueryInterface（Ci.nsITraceableChannel）; 
 console.log（ch.toString（））; 
 //[xpconnect wrapped（nsISupports，nsIChannel，nsITraceableChannel）]
 
 console.log（ch instanceof Ci.nsIUploadChannel）; 
 // true 
 console.log（ch.toString（））; 
 //[xpconnect wrapped（nsISupports，nsIChannel，nsITraceableChannel，nsIUploadChannel）]
 //变量ch已知可以实现这四个给定的接口。 
 * / 
  

更新

有人问我如何得到响应源，所以我创建了一个要点：

Ive been trying to get this code working for firefox, that I got fromnsITraceableChannel, Intercept HTTP Traffic and from How to get an url from nsITraceableChannel?, Ive been googling for the answer, with no luck.What I would like to do is intercept certain links, and change them.Any help is welcomed

The error I get is function statement requires a name witch points to observe: function(aSubject, aTopic, aData) part of the code

 const Cc = Components.classes;
const Ci = Components.interfaces;

var observerService = Cc["@mozilla.org/observer-service;1"]
    .getService(Ci.nsIObserverService);

observerService.addObserver(httpRequestObserver,
    "http-on-examine-response", false);

observerService.removeObserver(httpRequestObserver,
    "http-on-examine-response");
//--------------------------------------------------------

 var httpRequestObserver =
{
    observe: function(aSubject, aTopic, aData)
    {
        if (aTopic == "http-on-examine-response")
        {
        }
    },

    QueryInterface : function (aIID)
    {
        if (aIID.equals(Ci.nsIObserver) ||
            aIID.equals(Ci.nsISupports))
        {
            return this;
        }

        throw Components.results.NS_NOINTERFACE;

    }
}

//------------------------------------------------------------

 function TracingListener() {
    this.originalListener = null;
}

TracingListener.prototype =
{
    onDataAvailable: function(request, context, inputStream, offset, count) {
        this.originalListener.onDataAvailable(request, context, inputStream, offset, count);
    },

    onStartRequest: function(request, context) {
        this.originalListener.onStartRequest(request, context);
    },

    onStopRequest: function(request, context, statusCode) {
        this.originalListener.onStopRequest(request, context, statusCode);
    },

    QueryInterface: function (aIID) {
        if (aIID.equals(Ci.nsIStreamListener) ||
            aIID.equals(Ci.nsISupports)) {
            return this;
        }
        throw Components.results.NS_NOINTERFACE;
    }
}

observe: function(aSubject, aTopic, aData)
{
    if (aTopic == "http-on-examine-response") {
        var newListener = new TracingListener();
        aSubject.QueryInterface(Ci.nsITraceableChannel);
        newListener.originalListener = aSubject.setNewListener(newListener);
    }
}

aSubject = aSubject.QueryInterface(Ci.nsIChannel);
var uri = aSubject.URI;
// original URI that was requested before any other resolver steps
// and/or redirects.
var ouri = aSubject.originalURI;

ch = Services.io.newChannel("https://google.com/", null, null);
console.log(ch.toString());
// "[xpconnect wrapped nsIChannel]"

ch.QueryInterface(Ci.nsITraceableChannel); 
console.log(ch.toString());
// "[xpconnect wrapped (nsISupports, nsIChannel, nsITraceableChannel)]"

console.log(ch instanceof Ci.nsIUploadChannel);
// true
console.log(ch.toString());
// "[xpconnect wrapped (nsISupports, nsIChannel, nsITraceableChannel, nsIUploadChannel)]"
// the variable "ch" is known to implement the four given interfaces at this point.

解决方案

Copy paste this it works:

// const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
// Cu.import('resource://gre/modules/Services.jsm');

Services.obs.addObserver(httpRequestObserver, "http-on-examine-response", false);

// Services.obs.removeObserver(httpRequestObserver, "http-on-examine-response");
//--------------------------------------------------------

var httpRequestObserver = {
    observe: function(aSubject, aTopic, aData) {
        // if (aTopic == "http-on-examine-response") {} // no need for this, we added observer for `http-on-examine-response` so we know for sure this only triggers for `http-on-examine-response`
        var newListener = new TracingListener();
        aSubject.QueryInterface(Ci.nsITraceableChannel);
        newListener.originalListener = aSubject.setNewListener(newListener);
    }
    /* // what was the point of this block of code?
    ,
    QueryInterface: function(aIID) {
        if (aIID.equals(Ci.nsIObserver) || aIID.equals(Ci.nsISupports)) {
            return this;
        }
        throw Cr.NS_NOINTERFACE;
    }
    */
}

//------------------------------------------------------------

function TracingListener() {}
TracingListener.prototype = {
    onDataAvailable: function(request, context, inputStream, offset, count) {
        console.log('data available');
        this.originalListener.onDataAvailable(request, context, inputStream, offset, count);
    },
    onStartRequest: function(request, context) {
        this.originalListener.onStartRequest(request, context);
    },
    onStopRequest: function(request, context, statusCode) {
        this.originalListener.onStopRequest(request, context, statusCode);
    },
    QueryInterface: function(aIID) {
        if (aIID.equals(Ci.nsIStreamListener) || aIID.equals(Ci.nsISupports)) {
            return this;
        }
        throw Cr.NS_NOINTERFACE;
    }
}

// what the hell? this is not part of an object? why observe colon?
/*
observe: function(aSubject, aTopic, aData) {
    if (aTopic == "http-on-examine-response") {
        var newListener = new TracingListener();
        aSubject.QueryInterface(Ci.nsITraceableChannel);
        newListener.originalListener = aSubject.setNewListener(newListener);
    }
}
*/

// whats with all this junk? is it supposed to be in an observer??
/*
aSubject = aSubject.QueryInterface(Ci.nsIChannel);
var uri = aSubject.URI;
// original URI that was requested before any other resolver steps
// and/or redirects.
var ouri = aSubject.originalURI;

ch = Services.io.newChannel("https://google.com/", null, null);
console.log(ch.toString());
// "[xpconnect wrapped nsIChannel]"

ch.QueryInterface(Ci.nsITraceableChannel);
console.log(ch.toString());
// "[xpconnect wrapped (nsISupports, nsIChannel, nsITraceableChannel)]"

console.log(ch instanceof Ci.nsIUploadChannel);
// true
console.log(ch.toString());
// "[xpconnect wrapped (nsISupports, nsIChannel, nsITraceableChannel, nsIUploadChannel)]"
// the variable "ch" is known to implement the four given interfaces at this point.
*/

Update

Someone asked me how to get the response source with this, so I created a gist out of it: https://gist.github.com/Noitidart/d0b08629ee2804538ad9#file-_ff-addon-snippet-copyofrequestsource-js-L16

这篇关于nsITraceableChannel，拦截HTTP通信代码的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！