1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
// 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.
// -----------------------------------------------------------------------------
// This script contains unprivileged javascript APIs related to chrome
// extensions. It is loaded by any extension-related context, such as content
// scripts or toolstrips.
// See user_script_slave.cc for script that is loaded by content scripts only.
// TODO(mpcomplete): we also load this in regular web pages, but don't need
// to.
var chrome = chrome || {};
(function () {
native function OpenChannelToExtension(id, name);
native function CloseChannel(portId);
native function PortAddRef(portId);
native function PortRelease(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, opt_name) {
this.portId_ = portId;
this.name = opt_name;
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, opt_name) {
if (ports[portId]) {
throw new Error("Port '" + portId + "' already exists.");
}
var port = new chrome.Port(portId, opt_name);
ports[portId] = port;
chromeHidden.onUnload.addListener(function() {
PortRelease(portId);
});
PortAddRef(portId);
return port;
}
// Called by native code when a channel has been opened to this context.
chromeHidden.Port.dispatchOnConnect = function(portId, channelName, 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, channelName);
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(connectInfo) {
var name = "";
if (connectInfo) {
name = connectInfo.name || name;
}
var portId = OpenChannelToExtension(this.id_, name);
if (portId == -1)
throw new Error("No such extension: '" + this.id_ + "'");
return chromeHidden.Port.createPort(portId, name);
};
// 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 || {};
})();
|
