You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

241 lines
7.6 KiB

/*******************************************************************************
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/uMatrix
*/
'use strict';
/******************************************************************************/
this.EXPORTED_SYMBOLS = ['contentObserver'];
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;
// Cu.import('resource://gre/modules/devtools/Console.jsm');
/******************************************************************************/
const getMessageManager = function(win) {
return win
.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIDocShell)
.sameTypeRootTreeItem
.QueryInterface(Ci.nsIDocShell)
.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIContentFrameMessageManager);
};
/******************************************************************************/
const contentObserver = {
classDescription: 'content-policy for ' + hostName,
classID: Components.ID('{c84283d4-9975-41b7-b1a4-f106af56b51d}'),
contractID: '@' + hostName + '/content-policy;1',
ACCEPT: Ci.nsIContentPolicy.ACCEPT,
MAIN_FRAME: Ci.nsIContentPolicy.TYPE_DOCUMENT,
contentBaseURI: 'chrome://' + hostName + '/content/js/',
uniqueSandboxId: 1,
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.nsIObserver,
Ci.nsIContentPolicy,
Ci.nsISupportsWeakReference
]),
createInstance: function(outer, iid) {
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
);
},
unregister: function() {
Services.obs.removeObserver(this, 'document-element-inserted');
this.componentRegistrar.unregisterFactory(this.classID, this);
this.categoryManager.deleteCategoryEntry(
'content-policy',
this.contractID,
false
);
},
// https://bugzil.la/612921
shouldLoad: function(type, location, origin, context) {
return this.ACCEPT;
},
initContentScripts: function(win, sandbox) {
let messager = getMessageManager(win);
let sandboxId = hostName + ':sb:' + this.uniqueSandboxId++;
if ( sandbox ) {
let sandboxName = [
win.location.href.slice(0, 100),
win.document.title.slice(0, 100)
].join(' | ');
sandbox = Cu.Sandbox([win], {
sandboxName: sandboxId + '[' + sandboxName + ']',
sandboxPrototype: win,
wantComponents: false,
wantXHRConstructor: false
});
sandbox.injectScript = function(script) {
Services.scriptloader.loadSubScript(script, sandbox);
};
}
else {
sandbox = win;
}
sandbox._sandboxId_ = sandboxId;
sandbox.sendAsyncMessage = messager.sendAsyncMessage;
sandbox.addMessageListener = function(callback) {
if ( sandbox._messageListener_ ) {
sandbox.removeMessageListener();
}
sandbox._messageListener_ = function(message) {
callback(message.data);
};
messager.addMessageListener(
sandbox._sandboxId_,
sandbox._messageListener_
);
messager.addMessageListener(
hostName + ':broadcast',
sandbox._messageListener_
);
};
sandbox.removeMessageListener = function() {
try {
messager.removeMessageListener(
sandbox._sandboxId_,
sandbox._messageListener_
);
messager.removeMessageListener(
hostName + ':broadcast',
sandbox._messageListener_
);
} catch (ex) {
// It throws sometimes, mostly when the popup closes
}
sandbox._messageListener_ = null;
};
return sandbox;
},
observe: function(doc) {
let win = doc.defaultView;
if ( !win ) {
return;
}
let loc = win.location;
if ( !loc ) {
return;
}
// https://github.com/gorhill/uBlock/issues/260
// TODO: We may have to skip more types, for now let's be
// conservative, i.e. let's not test against `text/html`.
if ( doc.contentType.lastIndexOf('image/', 0) === 0 ) {
return;
}
if ( loc.protocol !== 'http:' && loc.protocol !== 'https:' && loc.protocol !== 'file:' ) {
if ( loc.protocol === 'chrome:' && loc.host === hostName ) {
this.initContentScripts(win);
}
// What about data: and about:blank?
return;
}
let lss = Services.scriptloader.loadSubScript;
let sandbox = this.initContentScripts(win, true);
// Can throw with attempts at injecting into non-HTML document.
// Example: https://a.pomf.se/avonjf.webm
try {
lss(this.contentBaseURI + 'vapi-client.js', sandbox);
lss(this.contentBaseURI + 'contentscript-start.js', sandbox);
} catch (ex) {
return; // don't further try to inject anything
}
let docReady = (e) => {
let doc = e.target;
doc.removeEventListener(e.type, docReady, true);
lss(this.contentBaseURI + 'contentscript-end.js', sandbox);
};
if ( doc.readyState === 'loading') {
doc.addEventListener('DOMContentLoaded', docReady, true);
} else {
docReady({ target: doc, type: 'DOMContentLoaded' });
}
}
};
/******************************************************************************/
contentObserver.register();
/******************************************************************************/