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/*******************************************************************************
µBlock - a Chromium browser extension to block requests.
Copyright (C) 2014 Raymond Hill
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
*/
// So there might be memory leaks related to the direct use of sendMessage(),
// as per https://code.google.com/p/chromium/issues/detail?id=320723. The issue
// is not marked as resolved, and the last message from chromium dev is:
//
// "You can construct Port objects (runtime.connect) and emulate sendMessage
// "behaviour. The bug is that sendMessage doesn't clean up its Ports."
//
// So the point here is to have an infrastructure which allows relying more on
// direct use of Port objects rather than going through sendMessage().
/******************************************************************************/
/*******************************************************************************
// Here this is the "server"-side implementation.
//
// Reference client-side implementation is found in:
//
// messaging-client.js
//
// For instance, it needs to be cut & pasted for content scripts since
// I can not include in a simple way js file content from another js file.
*******************************************************************************/
/******************************************************************************/
µBlock.messaging = (function() {
/******************************************************************************/
var nameToPortMap = {};
var nameToListenerMap = {};
var nullFunc = function(){};
/******************************************************************************/
var listenerNameFromPortName = function(portName) {
var pos = portName.indexOf('/');
if ( pos <= 0 ) {
return '';
}
return portName.slice(0, pos);
};
var listenerFromPortName = function(portName) {
return nameToListenerMap[listenerNameFromPortName(portName)];
};
/******************************************************************************/
var listen = function(portName, callback) {
var listener = nameToListenerMap[portName];
if ( listener && listener !== callback ) {
throw 'Only one listener allowed';
}
nameToListenerMap[portName] = callback;
};
/******************************************************************************/
var tell = function(target, msg) {
target += '/';
for ( var portName in nameToPortMap ) {
if ( nameToPortMap.hasOwnProperty(portName) === false ) {
continue;
}
if ( portName.indexOf(target) === 0 ) {
nameToPortMap[portName].postMessage({ id: -1, msg: msg });
}
}
};
/******************************************************************************/
var announce = function(msg) {
// Background page handler
defaultHandler(msg, null, nullFunc);
// Extension pages & content scripts handlers
var port;
for ( var portName in nameToPortMap ) {
if ( nameToPortMap.hasOwnProperty(portName) === false ) {
continue;
}
nameToPortMap[portName].postMessage({ id: -1, msg: msg });
}
};
/******************************************************************************/
var onMessage = function(request, port) {
// Annoucement: dispatch everywhere.
if ( request.id < 0 ) {
announce(request.msg);
return;
}
var listener = listenerFromPortName(port.name) || defaultHandler;
var reqId = request.id;
// Being told
if ( reqId <= 0 ) {
listener(request.msg, port.sender, nullFunc);
return;
}
// Being asked
listener(request.msg, port.sender, function(response) {
port.postMessage({
id: reqId,
msg: response !== undefined ? response : null
});
});
};
/******************************************************************************/
// Default is for commonly used message.
function defaultHandler(request, sender, callback) {
// Async
switch ( request.what ) {
case 'getAssetContent':
if ( /^https?:\/\//.test(request.url) ) {
return µBlock.assets.getExternal(request.url, callback);
}
return µBlock.assets.get(request.url, callback);
case 'loadUbiquitousAllowRules':
return µBlock.loadUbiquitousWhitelists();
default:
break;
}
// Sync
var response;
switch ( request.what ) {
case 'forceReloadTab':
µBlock.forceReload(request.pageURL);
break;
case 'getUserSettings':
response = µBlock.userSettings;
break;
case 'gotoExtensionURL':
µBlock.utils.gotoExtensionURL(request.url);
break;
case 'gotoURL':
µBlock.utils.gotoURL(request);
break;
case 'reloadAllFilters':
µBlock.reloadPresetBlacklists(request.switches);
break;
case 'userSettings':
response = µBlock.changeUserSettings(request.name, request.value);
break;
default:
// console.error('µBlock> messaging.js / defaultHandler > unknown request: %o', request);
break;
}
callback(response);
}
/******************************************************************************/
// Port disconnected, relay this information to apropriate listener.
var onDisconnect = function(port) {
// Notify listener of the disconnection -- using a reserved message id.
var listener = listenerFromPortName(port.name) || defaultHandler;
var msg = {
'what': 'disconnected',
'which': listenerNameFromPortName(port.name)
};
listener(msg, port.sender, nullFunc);
// Cleanup port if no longer in use.
var port = nameToPortMap[port.name];
if ( port ) {
delete nameToPortMap[port.name];
port.onMessage.removeListener(onMessage);
port.onDisconnect.removeListener(onDisconnect);
}
};
/******************************************************************************/
var onConnect = function(port) {
// We must have a port name.
if ( !port.name ) {
throw 'µBlock> messaging.js / onConnectHandler(): no port name!';
}
// Port should not already exist.
if ( nameToPortMap[port.name] ) {
throw 'µBlock> messaging.js / onConnectHandler(): port already exists!';
}
nameToPortMap[port.name] = port;
port.onMessage.addListener(onMessage);
port.onDisconnect.addListener(onDisconnect);
};
/******************************************************************************/
chrome.runtime.onConnect.addListener(onConnect);
/******************************************************************************/
return {
listen: listen,
tell: tell,
announce: announce,
defaultHandler: defaultHandler
};
/******************************************************************************/
})();
/******************************************************************************/
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