uBlock/platform/firefox/frameModule.js

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/*******************************************************************************
µBlock - a browser extension to block requests.
Copyright (C) 2014 The µBlock authors
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see {http://www.gnu.org/licenses/}.
Home: https://github.com/gorhill/uBlock
*/
/* global Services, Components, XPCOMUtils, __URI__ */
'use strict';
/******************************************************************************/
this.EXPORTED_SYMBOLS = ['contentPolicy', 'docObserver'];
const {interfaces: Ci, utils: Cu} = Components;
const appName = __URI__.match(/:\/\/([^\/]+)/)[1];
Cu['import']('resource://gre/modules/Services.jsm');
Cu['import']('resource://gre/modules/XPCOMUtils.jsm');
// Cu['import']('resource://gre/modules/devtools/Console.jsm');
/******************************************************************************/
const getMessageManager = function(context) {
return context
.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIDocShell)
.sameTypeRootTreeItem
.QueryInterface(Ci.nsIDocShell)
.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIContentFrameMessageManager);
};
/******************************************************************************/
const contentPolicy = {
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classDescription: 'content-policy implementation for ' + appName,
classID: Components.ID('{e6d173c8-8dbf-4189-a6fd-189e8acffd27}'),
contractID: '@' + appName + '/content-policy;1',
ACCEPT: Ci.nsIContentPolicy.ACCEPT,
messageName: appName + ':shouldLoad',
get componentRegistrar() {
return Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
},
get categoryManager() {
return Components.classes['@mozilla.org/categorymanager;1']
.getService(Ci.nsICategoryManager);
},
QueryInterface: XPCOMUtils.generateQI([
Ci.nsIFactory,
Ci.nsIContentPolicy,
Ci.nsISupportsWeakReference
]),
createInstance: function(outer, iid) {
if (outer) {
throw Components.results.NS_ERROR_NO_AGGREGATION;
}
return this.QueryInterface(iid);
},
register: function() {
this.componentRegistrar.registerFactory(
this.classID,
this.classDescription,
this.contractID,
this
);
this.categoryManager.addCategoryEntry(
'content-policy',
this.contractID,
this.contractID,
false,
true
);
},
unregister: function() {
this.componentRegistrar.unregisterFactory(this.classID, this);
this.categoryManager.deleteCategoryEntry(
'content-policy',
this.contractID,
false
);
},
// https://bugzil.la/612921
shouldLoad: function(type, location, origin, context) {
if (!context || !/^https?$/.test(location.scheme)) {
return this.ACCEPT;
}
let win = type === 6
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? context.contentWindow || context
: (context.ownerDocument || context).defaultView;
if (win) {
getMessageManager(win).sendSyncMessage(this.messageName, {
url: location.spec,
type: type,
frameId: type === 6 ? -1 : (win === win.top ? 0 : 1),
parentFrameId: win === win.top ? -1 : 0
});
}
return this.ACCEPT;
}
};
/******************************************************************************/
const docObserver = {
contentBaseURI: 'chrome://' + appName + '/content/',
initContext: function(win, sandbox) {
let messager = getMessageManager(win);
if (sandbox) {
win = Cu.Sandbox([win], {
sandboxPrototype: win,
wantComponents: false,
wantXHRConstructor: false
});
win.self = win;
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// anonymous function needs to be used here
win.injectScript = Cu.exportFunction(
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function(script, evalCode) {
if (evalCode) {
Cu.evalInSandbox(script, win);
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return;
}
Services.scriptloader.loadSubScript(
docObserver.contentBaseURI + script,
win
);
},
win
);
}
win.sendAsyncMessage = messager.sendAsyncMessage;
win.addMessageListener = messager.ublock_addMessageListener;
win.removeMessageListener = messager.ublock_removeMessageListener;
return win;
},
register: function() {
Services.obs.addObserver(this, 'document-element-inserted', false);
},
unregister: function() {
Services.obs.removeObserver(this, 'document-element-inserted');
},
observe: function(doc) {
let win = doc.defaultView;
if (!win) {
return;
}
if (!/^https?:$/.test(win.location.protocol)) {
if (win.location.protocol === 'chrome:'
&& win.location.host === appName) {
this.initContext(win);
}
return;
}
let lss = Services.scriptloader.loadSubScript;
win = this.initContext(win, true);
lss(this.contentBaseURI + 'js/vapi-client.js', win);
lss(this.contentBaseURI + 'js/contentscript-start.js', win);
let docReady = function(e) {
this.removeEventListener(e.type, docReady, true);
lss(docObserver.contentBaseURI + 'js/contentscript-end.js', win);
};
doc.addEventListener('DOMContentLoaded', docReady, true);
}
};
/******************************************************************************/
contentPolicy.register();
docObserver.register();
/******************************************************************************/