防止xulrunner中的浏览器位置更改

Preventing Browser Location Change in xulrunner

本文关键字：位置 浏览器 xulrunner 防止      更新时间：2023-09-26

我一直在阅读和破解https://developer.mozilla.org/en/XUL_School/Intercepting_Page_Loads但似乎可以做我需要的事。

我正在开发Chromeless，试图防止主xulbrowser元素被导航离开，例如，链接不应该工作，window.location.href="http://www.example.com/"也不应该工作。

我假设我可以通过browser.webProgress.addProgressListener做到这一点，然后收听onProgressChange，但我不知道如何区分资源请求和browser更改位置（似乎onLocationChange太晚了，因为文档已经被卸载）。

browser.webProgress.addProgressListener({
    onLocationChange: function(){},
    onStatusChange: function(){},
    onStateChange: function(){},
    onSecurityChange: function(){},
    onProgressChange: function(){
        aRequest.QueryInterface(Components.interfaces.nsIHttpChannel)
        if( /* need to check if the object triggering the event is the xulbrowser */ ){
            aRequest.cancel(Components.results.NS_BINDING_ABORTED);
        }
    },
    QueryInterface: xpcom.utils.generateQI([Ci.nsIWebProgressListener, Ci.nsISupportsWeakReference])
}, wo._browser.webProgress.NOTIFY_ALL);

另一个听起来很有前景的选项是nsIContentPolicy.shouldLoad()方法，但我真的不知道如何"创建一个扩展nsIContentPolicy的XPCOM组件，并使用nsICategoryManager将其注册到"内容策略"类别。"

有什么想法吗？

我从mozilla的#xulrunner irc频道得到了帮助。

得到的解决方案如下。

注意：这是Mozilla Chromeless中使用的模块，require("chrome")和require("xpcom")位在正常情况下不可用

const {Cc, Ci, Cu, Cm, Cr} = require("chrome");
const xpcom = require("xpcom");
/***********************************************************
class definition
***********************************************************/
var description = "Chromeless Policy XPCOM Component";
/* UID generated by http://www.famkruithof.net/uuid/uuidgen */
var classID = Components.ID("{2e946f14-72d5-42f3-95b7-4907c676cf2b}");
// I just made this up. Don't know if I'm supposed to do that.
var contractID = "@mozilla.org/chromeless-policy;1";
//class constructor
function ChromelessPolicy() {
    //this.wrappedJSObject = this;
}
// class definition
var ChromelessPolicy = {
  // properties required for XPCOM registration:
  classDescription: description,
  classID:          classID,
  contractID:       contractID,
  xpcom_categories: ["content-policy"],
  // QueryInterface implementation
  QueryInterface: xpcom.utils.generateQI([Ci.nsIContentPolicy,
    Ci.nsIFactory, Ci.nsISupportsWeakReference]),
  // ...component implementation...
  shouldLoad : function(aContentType, aContentLocation, aRequestOrigin, aContext, aMimeTypeGuess, aExtra) {
    let result = Ci.nsIContentPolicy.ACCEPT;
    // only filter DOCUMENTs (not SUB_DOCUMENTs, like iframes)
    if( aContentType === Ci.nsIContentPolicy["TYPE_DOCUMENT"]
        // block http(s) protocols...
        && /^http(s):/.test(aContentLocation.spec) ){
        // make sure we deny the request now
        result = Ci.nsIContentPolicy.REJECT_REQUEST;
    }
    // continue loading...
    return result;
  },
  createInstance: function(outer, iid) {
    if (outer)
        throw Cr.NS_ERROR_NO_AGGREGATION;
    return this.QueryInterface(iid);
  }
};
let registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
try
{
    Cm.nsIComponentRegistrar.registerFactory(classID, description, contractID, ChromelessPolicy);
}
catch (e) {
    // Don't stop on errors - the factory might already be registered
    Cu.reportError(e);
}
const categoryManager = Cc["@mozilla.org/categorymanager;1"].getService(Ci.nsICategoryManager);
for each (let category in ChromelessPolicy.xpcom_categories) {
    categoryManager.addCategoryEntry(category, ChromelessPolicy.classDescription, ChromelessPolicy.contractID, false, true);
}

为感兴趣的人在github上请求：https://github.com/mozilla/chromeless/pull/114

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