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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// -----------------------------------------------------------------------------
// NOTE: If you change this file you need to touch renderer_resources.grd to
// have your change take effect.
// -----------------------------------------------------------------------------
var chrome = chrome || {};
(function () {
native function OpenChannelToExtension(id);
native function CloseChannel(portId);
native function PostMessage(portId, msg);
native function GetChromeHidden();
var chromeHidden = GetChromeHidden();
// Map of port IDs to port object.
var ports = {};
// Port object. Represents a connection to another script context through
// which messages can be passed.
chrome.Port = function(portId) {
this.portId_ = portId;
this.onDisconnect = new chrome.Event();
this.onMessage = new chrome.Event();
};
chromeHidden.Port = {};
// Hidden port creation function. We don't want to expose an API that lets
// people add arbitrary port IDs to the port list.
chromeHidden.Port.createPort = function(portId) {
if (ports[portId]) {
throw new Error("Port '" + portId + "' already exists.");
}
var port = new chrome.Port(portId);
ports[portId] = port;
chromeHidden.onUnload.addListener(function() {
port.disconnect();
});
return port;
}
// Called by native code when a channel has been opened to this context.
chromeHidden.Port.dispatchOnConnect = function(portId, tab, extensionId) {
// Only create a new Port if someone is actually listening for a connection.
// In addition to being an optimization, this also fixes a bug where if 2
// channels were opened to and from the same process, closing one would
// close both.
var connectEvent = "channel-connect:" + extensionId;
if (chromeHidden.Event.hasListener(connectEvent)) {
var port = chromeHidden.Port.createPort(portId);
if (tab) {
tab = JSON.parse(tab);
}
port.tab = tab;
chromeHidden.Event.dispatch(connectEvent, [port]);
}
};
// Called by native code when a channel has been closed.
chromeHidden.Port.dispatchOnDisconnect = function(portId) {
var port = ports[portId];
if (port) {
port.onDisconnect.dispatch(port);
delete ports[portId];
}
};
// Called by native code when a message has been sent to the given port.
chromeHidden.Port.dispatchOnMessage = function(msg, portId) {
var port = ports[portId];
if (port) {
if (msg) {
msg = JSON.parse(msg);
}
port.onMessage.dispatch(msg, port);
}
};
// Sends a message asynchronously to the context on the other end of this
// port.
chrome.Port.prototype.postMessage = function(msg) {
// JSON.stringify doesn't support a root object which is undefined.
if (msg === undefined)
msg = null;
PostMessage(this.portId_, JSON.stringify(msg));
};
// Disconnects the port from the other end.
chrome.Port.prototype.disconnect = function() {
delete ports[this.portId_];
CloseChannel(this.portId_);
}
// Extension object.
chrome.Extension = function(id) {
this.id_ = id;
this.onConnect = new chrome.Event('channel-connect:' + id);
};
// Opens a message channel to the extension. Returns a Port for
// message passing.
chrome.Extension.prototype.connect = function() {
var portId = OpenChannelToExtension(this.id_);
if (portId == -1)
throw new Error("No such extension: '" + this.id_ + "'");
return chromeHidden.Port.createPort(portId);
};
// Returns a resource URL that can be used to fetch a resource from this
// extension.
chrome.Extension.prototype.getURL = function(path) {
return "chrome-extension://" + this.id_ + "/" + path;
};
chrome.self = chrome.self || {};
})();
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