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
*/
'use strict';
/******************************************************************************/
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// https://github.com/gorhill/uBlock/issues/800
this.EXPORTED_SYMBOLS = ['contentObserver', 'LocationChangeListener'];
const {interfaces: Ci, utils: Cu} = Components;
const {Services} = Cu.import('resource://gre/modules/Services.jsm', null);
const {XPCOMUtils} = Cu.import('resource://gre/modules/XPCOMUtils.jsm', null);
const hostName = Services.io.newURI(Components.stack.filename, null, null).host;
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const rpcEmitterName = hostName + ':child-process-message';
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//Cu.import('resource://gre/modules/devtools/Console.jsm');
/******************************************************************************/
const getMessageManager = function(win) {
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let iface = win
.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIDocShell)
.sameTypeRootTreeItem
.QueryInterface(Ci.nsIDocShell)
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.QueryInterface(Ci.nsIInterfaceRequestor);
try {
return iface.getInterface(Ci.nsIContentFrameMessageManager);
} catch (ex) {
// This can throw. It appears `shouldLoad` can be called *after* a
// tab has been closed. For example, a case where this happens all
// the time (FF38):
// - Open twitter.com (assuming you have an account and are logged in)
// - Close twitter.com
// There will be an exception raised when `shouldLoad` is called
// to process a XMLHttpRequest with URL `https://twitter.com/i/jot`
// fired from `https://twitter.com/`, *after* the tab is closed.
// In such case, `win` is `about:blank`.
}
return null;
};
/******************************************************************************/
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var contentObserver = {
classDescription: 'content-policy for ' + hostName,
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classID: Components.ID('{7afbd130-cbaf-46c2-b944-f5d24305f484}'),
contractID: '@' + hostName + '/content-policy;1',
ACCEPT: Ci.nsIContentPolicy.ACCEPT,
MAIN_FRAME: Ci.nsIContentPolicy.TYPE_DOCUMENT,
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SUB_FRAME: Ci.nsIContentPolicy.TYPE_SUBDOCUMENT,
contentBaseURI: 'chrome://' + hostName + '/content/js/',
cpMessageName: hostName + ':shouldLoad',
ignoredPopups: new WeakMap(),
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uniqueSandboxId: 1,
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get componentRegistrar() {
return Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
},
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get categoryManager() {
return Components.classes['@mozilla.org/categorymanager;1']
.getService(Ci.nsICategoryManager);
},
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QueryInterface: XPCOMUtils.generateQI([
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Ci.nsIFactory,
Ci.nsIObserver,
Ci.nsIContentPolicy,
Ci.nsISupportsWeakReference
]),
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createInstance: function(outer, iid) {
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if ( outer ) {
throw Components.results.NS_ERROR_NO_AGGREGATION;
}
return this.QueryInterface(iid);
},
register: function() {
Services.obs.addObserver(this, 'document-element-inserted', true);
this.componentRegistrar.registerFactory(
this.classID,
this.classDescription,
this.contractID,
this
);
this.categoryManager.addCategoryEntry(
'content-policy',
this.contractID,
this.contractID,
false,
true
);
},
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unregister: function() {
Services.obs.removeObserver(this, 'document-element-inserted');
this.componentRegistrar.unregisterFactory(this.classID, this);
this.categoryManager.deleteCategoryEntry(
'content-policy',
this.contractID,
false
);
},
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getFrameId: function(win) {
return win
.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIDOMWindowUtils)
.outerWindowID;
},
// https://bugzil.la/612921
shouldLoad: function(type, location, origin, context) {
// For whatever reason, sometimes the global scope is completely
// uninitialized at this point. Repro steps:
// - Launch FF with uBlock enabled
// - Disable uBlock
// - Enable uBlock
// - Services and all other global variables are undefined
// Hopefully will eventually understand why this happens.
if ( Services === undefined ) {
return this.ACCEPT;
}
if ( !context ) {
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return this.ACCEPT;
}
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if ( !location.schemeIs('http') && !location.schemeIs('https') ) {
return this.ACCEPT;
}
let openerURL = null;
if ( type === this.MAIN_FRAME ) {
context = context.contentWindow || context;
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if (
typeof context.opener === 'object' &&
context.opener !== null &&
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context.opener !== context &&
this.ignoredPopups.has(context) === false
) {
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// https://github.com/gorhill/uBlock/issues/452
// Use location of top window, not that of a frame, as this
// would cause tab id lookup (necessary for popup blocking) to
// always fail.
openerURL = context.opener.top && context.opener.top.location.href;
}
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} else if ( type === this.SUB_FRAME ) {
context = context.contentWindow;
} else {
context = (context.ownerDocument || context).defaultView;
}
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// The context for the toolbar popup is an iframe element here,
// so check context.top instead of context
if ( !context.top || !context.location ) {
return this.ACCEPT;
}
let isTopLevel = context === context.top;
let parentFrameId;
if ( isTopLevel ) {
parentFrameId = -1;
} else if ( context.parent === context.top ) {
parentFrameId = 0;
} else {
parentFrameId = this.getFrameId(context.parent);
}
let messageManager = getMessageManager(context);
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if ( messageManager === null ) {
return this.ACCEPT;
}
let details = {
frameId: isTopLevel ? 0 : this.getFrameId(context),
openerURL: openerURL,
parentFrameId: parentFrameId,
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rawtype: type,
url: location.spec
};
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//console.log('shouldLoad: type=' + type' ' + 'url=' + location.spec);
if ( typeof messageManager.sendRpcMessage === 'function' ) {
// https://bugzil.la/1092216
messageManager.sendRpcMessage(this.cpMessageName, details);
} else {
// Compatibility for older versions
messageManager.sendSyncMessage(this.cpMessageName, details);
}
return this.ACCEPT;
},
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initContentScripts: function(win, create) {
let messager = getMessageManager(win);
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let sandboxId = hostName + ':sb:' + this.uniqueSandboxId++;
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let sandbox;
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if ( create ) {
let sandboxName = [
win.location.href.slice(0, 100),
win.document.title.slice(0, 100)
].join(' | ');
// https://github.com/gorhill/uMatrix/issues/325
// "Pass sameZoneAs to sandbox constructor to make GCs cheaper"
sandbox = Cu.Sandbox([win], {
sameZoneAs: win.top,
sandboxName: sandboxId + '[' + sandboxName + ']',
sandboxPrototype: win,
wantComponents: false,
wantXHRConstructor: false
});
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if ( Services.cpmm ) {
sandbox.rpc = function(details) {
var svc = Services;
if ( svc === undefined ) { return; }
var cpmm = svc.cpmm;
if ( !cpmm ) { return; }
var r = cpmm.sendSyncMessage(rpcEmitterName, details);
if ( Array.isArray(r) ) {
return r[0];
}
};
} else {
sandbox.rpc = function() {};
}
sandbox.injectScript = function(script) {
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var svc = Services;
if ( svc !== undefined ) {
svc.scriptloader.loadSubScript(script, sandbox);
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} else {
// Sandbox appears void.
// I've seen this happens, need to investigate why.
}
};
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// The goal is to have content scripts removed from web pages. This
// helps remove traces of uBlock from memory when disabling/removing
// the addon.
// For example, this takes care of:
// https://github.com/gorhill/uBlock/commit/ea4faff383789053f423498c1f1165c403fde7c7#commitcomment-11964137
// > "gets the whole selected tab flashing"
sandbox.outerShutdown = function() {
sandbox.removeMessageListener();
sandbox.addMessageListener =
sandbox.injectScript =
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sandbox.outerShutdown =
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sandbox.removeMessageListener =
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sandbox.rpc =
sandbox.sendAsyncMessage = function(){};
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sandbox.vAPI = {};
messager = null;
};
}
else {
sandbox = win;
}
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sandbox._sandboxId_ = sandboxId;
sandbox.sendAsyncMessage = messager.sendAsyncMessage;
sandbox.addMessageListener = function(callback) {
if ( sandbox._messageListener_ ) {
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sandbox.removeMessageListener();
}
sandbox._messageListener_ = function(message) {
callback(message.data);
};
messager.addMessageListener(
sandbox._sandboxId_,
sandbox._messageListener_
);
messager.addMessageListener(
hostName + ':broadcast',
sandbox._messageListener_
);
};
sandbox.removeMessageListener = function() {
if ( !sandbox._messageListener_ ) {
return;
}
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try {
messager.removeMessageListener(
sandbox._sandboxId_,
sandbox._messageListener_
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);
messager.removeMessageListener(
hostName + ':broadcast',
sandbox._messageListener_
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);
} catch (ex) {
// It throws sometimes, mostly when the popup closes
}
sandbox._messageListener_ = null;
};
return sandbox;
},
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ignorePopup: function(e) {
if ( e.isTrusted === false ) {
return;
}
let contObs = contentObserver;
contObs.ignoredPopups.set(this, true);
this.removeEventListener('keydown', contObs.ignorePopup, true);
this.removeEventListener('mousedown', contObs.ignorePopup, true);
},
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observe: function(doc) {
// For whatever reason, sometimes the global scope is completely
// uninitialized at this point. Repro steps:
// - Launch FF with uBlock enabled
// - Disable uBlock
// - Enable uBlock
// - Services and all other global variables are undefined
// Hopefully will eventually understand why this happens.
if ( Services === undefined ) {
return;
}
let win = doc.defaultView || null;
if ( win === null ) {
return;
}
if ( win.opener && this.ignoredPopups.has(win) === false ) {
win.addEventListener('keydown', this.ignorePopup, true);
win.addEventListener('mousedown', this.ignorePopup, true);
}
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// https://github.com/gorhill/uBlock/issues/260
// https://developer.mozilla.org/en-US/docs/Web/API/Document/contentType
// "Non-standard, only supported by Gecko. To be used in
// "chrome code (i.e. Extensions and XUL applications)."
// TODO: We may have to exclude more types, for now let's be
// conservative and focus only on the one issue reported, i.e. let's
// not test against 'text/html'.
if ( doc.contentType.startsWith('image/') ) {
return;
}
let loc = win.location;
if ( loc.protocol !== 'http:' && loc.protocol !== 'https:' && loc.protocol !== 'file:' ) {
if ( loc.protocol === 'chrome:' && loc.host === hostName ) {
this.initContentScripts(win);
}
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// What about data: and about:blank?
return;
}
let lss = Services.scriptloader.loadSubScript;
let sandbox = this.initContentScripts(win, true);
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try {
lss(this.contentBaseURI + 'vapi-client.js', sandbox);
lss(this.contentBaseURI + 'contentscript-start.js', sandbox);
} catch (ex) {
//console.exception(ex.msg, ex.stack);
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return;
}
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let docReady = (e) => {
let doc = e.target;
doc.removeEventListener(e.type, docReady, true);
lss(this.contentBaseURI + 'contentscript-end.js', sandbox);
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if (
doc.querySelector('a[href^="abp:"]') ||
loc.href === 'https://github.com/gorhill/uBlock/wiki/Filter-lists-from-around-the-web'
) {
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lss(this.contentBaseURI + 'subscriber.js', sandbox);
}
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};
if ( doc.readyState === 'loading') {
doc.addEventListener('DOMContentLoaded', docReady, true);
} else {
docReady({ target: doc, type: 'DOMContentLoaded' });
}
}
};
/******************************************************************************/
const locationChangedMessageName = hostName + ':locationChanged';
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var LocationChangeListener = function(docShell) {
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if ( !docShell ) {
return;
}
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var requestor = docShell.QueryInterface(Ci.nsIInterfaceRequestor);
var ds = requestor.getInterface(Ci.nsIWebProgress);
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if ( !ds ) {
return;
}
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var mm = requestor.getInterface(Ci.nsIContentFrameMessageManager);
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if ( !mm ) {
return;
}
if ( typeof mm.sendAsyncMessage !== 'function' ) {
return;
}
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this.docShell = ds;
this.messageManager = mm;
ds.addProgressListener(this, Ci.nsIWebProgress.NOTIFY_LOCATION);
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};
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LocationChangeListener.prototype.QueryInterface = XPCOMUtils.generateQI([
'nsIWebProgressListener',
'nsISupportsWeakReference'
]);
LocationChangeListener.prototype.onLocationChange = function(webProgress, request, location, flags) {
if ( !webProgress.isTopLevel ) {
return;
}
this.messageManager.sendAsyncMessage(locationChangedMessageName, {
url: location.asciiSpec,
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flags: flags
});
};
/******************************************************************************/
contentObserver.register();
/******************************************************************************/