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portal.js
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portal.js
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/*
* Portal v1.1-snapshot
* http://github.com/flowersinthesand/portal
*
* Copyright 2011-2013, Donghwan Kim
* Licensed under the Apache License, Version 2.0
* http://www.apache.org/licenses/LICENSE-2.0
*/
// Implement the Universal Module Definition (UMD) pattern
// see https://github.com/umdjs/umd/blob/master/returnExports.js
(function(root, factory) {
if (typeof define === "function" && define.amd) {
// AMD
define(function() {
return factory(root);
});
} else if (typeof exports === "object") {
// Node
module.exports = factory(function() {
// Prepare the window powered by jsdom
var window = require("jsdom").jsdom().createWindow();
window.WebSocket = require("ws");
window.EventSource = require("eventsource");
return window;
}());
// node-XMLHttpRequest 1.x conforms XMLHttpRequest Level 1 but can perform a cross-domain request
module.exports.support.corsable = true;
} else {
// Browser globals, Window
root.portal = factory(root);
}
}(this, function(window) {
// Enables ECMAScript 5′s strict mode
"use strict";
var // A global identifier
guid,
// Is the unload event being processed?
unloading,
// Portal
portal,
// Convenience utilities
support,
// Default options
defaults,
// Transports
transports,
// Socket instances
sockets = {},
// Callback names for JSONP
jsonpCallbacks = [],
// Core prototypes
toString = Object.prototype.toString,
hasOwn = Object.prototype.hasOwnProperty,
slice = Array.prototype.slice,
// Regard for Node since these are not defined
document = window.document,
location = window.location;
// Callback function
function callbacks(deferred) {
var locked,
memory,
firing,
firingStart,
firingLength,
firingIndex,
list = [],
fire = function(context, args) {
args = args || [];
memory = !deferred || [context, args];
firing = true;
firingIndex = firingStart || 0;
firingStart = 0;
firingLength = list.length;
for (; firingIndex < firingLength; firingIndex++) {
list[firingIndex].apply(context, args);
}
firing = false;
},
self = {
add: function(fn) {
var length = list.length;
list.push(fn);
if (firing) {
firingLength = list.length;
} else if (!locked && memory && memory !== true) {
firingStart = length;
fire(memory[0], memory[1]);
}
},
remove: function(fn) {
var i;
for (i = 0; i < list.length; i++) {
if (fn === list[i] || (fn.guid && fn.guid === list[i].guid)) {
if (firing) {
if (i <= firingLength) {
firingLength--;
if (i <= firingIndex) {
firingIndex--;
}
}
}
list.splice(i--, 1);
}
}
},
fire: function(context, args) {
if (!locked && !firing && !(deferred && memory)) {
fire(context, args);
}
},
lock: function() {
locked = true;
},
locked: function() {
return !!locked;
},
unlock: function() {
locked = memory = firing = firingStart = firingLength = firingIndex = undefined;
}
};
return self;
}
// Socket function
function socket(url, options) {
var // Final options
opts,
// Transport
transport,
// The state of the connection
state,
// Reconnection
reconnectTimer,
reconnectDelay,
reconnectTry,
// Event helpers
events = {},
eventId = 0,
// Reply callbacks
replyCallbacks = {},
// Buffer
buffer = [],
// Map of the connection-scoped values
connection = {},
parts = /^([\w\+\.\-]+:)(?:\/\/([^\/?#:]*)(?::(\d+))?)?/.exec(url.toLowerCase()),
// Socket object
self = {
// Finds the value of an option
option: function(key) {
return opts[key];
},
// Gets or sets a connection-scoped value
data: function(key, value) {
if (value === undefined) {
return connection[key];
}
connection[key] = value;
return this;
},
// Returns the state
state: function() {
return state;
},
// Adds event handler
on: function(type, fn) {
var event;
// Handles a map of type and handler
if (typeof type === "object") {
for (event in type) {
self.on(event, type[event]);
}
return this;
}
// For custom event
event = events[type];
if (!event) {
if (events.message.locked()) {
return this;
}
event = events[type] = callbacks();
event.order = events.message.order;
}
event.add(fn);
return this;
},
// Removes event handler
off: function(type, fn) {
var event = events[type];
if (event) {
event.remove(fn);
}
return this;
},
// Adds one time event handler
one: function(type, fn) {
function proxy() {
self.off(type, proxy);
fn.apply(self, arguments);
}
fn.guid = fn.guid || guid++;
proxy.guid = fn.guid;
return self.on(type, proxy);
},
// Fires event handlers
fire: function(type) {
var event = events[type];
if (event) {
event.fire(self, slice.call(arguments, 1));
}
return this;
},
// Establishes a connection
open: function() {
var type,
latch,
connect = function() {
var candidates, type;
if (!latch) {
latch = true;
candidates = connection.candidates = slice.call(opts.transports);
while (!transport && candidates.length) {
type = candidates.shift();
connection.transport = type;
connection.url = self.buildURL("open");
transport = transports[type](self, opts);
}
// Increases the number of reconnection attempts
if (reconnectTry) {
reconnectTry++;
}
// Fires the connecting event and connects
if (transport) {
self.fire("connecting");
transport.open();
} else {
self.fire("close", "notransport");
}
}
},
cancel = function() {
if (!latch) {
latch = true;
self.fire("close", "canceled");
}
};
// Cancels the scheduled connection
if (reconnectTimer) {
clearTimeout(reconnectTimer);
}
// Resets the connection scope and event helpers
connection = {};
for (type in events) {
events[type].unlock();
}
// Chooses transport
transport = undefined;
// From null or waiting state
state = "preparing";
// Check if possible to make use of a shared socket
if (opts.sharing) {
connection.transport = "session";
transport = transports.session(self, opts);
}
// Executes the prepare handler if a physical connection is needed
if (transport) {
connect();
} else {
opts.prepare.call(self, connect, cancel, opts);
}
return this;
},
// Sends an event to the server via the connection
send: function(type, data, doneCallback, failCallback) {
var event;
// Defers sending an event until the state become opened
if (state !== "opened") {
buffer.push(arguments);
return this;
}
// Outbound event
event = {
id: ++eventId,
socket: opts.id,
type: type,
data: data,
reply: !!(doneCallback || failCallback)
};
if (event.reply) {
// Shared socket needs to know the callback event name
// because it fires the callback event directly instead of using reply event
if (connection.transport === "session") {
event.doneCallback = doneCallback;
event.failCallback = failCallback;
} else {
replyCallbacks[eventId] = {done: doneCallback, fail: failCallback};
}
}
// Delegates to the transport
transport.send(support.isBinary(data) ? data : opts.outbound.call(self, event));
return this;
},
// Disconnects the connection
close: function() {
var script, head;
// Prevents reconnection
opts.reconnect = false;
if (reconnectTimer) {
clearTimeout(reconnectTimer);
}
// Fires the close event immediately for transport which doesn't give feedback on disconnection
if (unloading || !transport || !transport.feedback) {
self.fire("close", unloading ? "error" : "aborted");
if (opts.notifyAbort && connection.transport !== "session") {
head = document.head || document.getElementsByTagName("head")[0] || document.documentElement;
script = document.createElement("script");
script.async = false;
script.src = self.buildURL("abort");
script.onload = script.onreadystatechange = function() {
if (!script.readyState || /loaded|complete/.test(script.readyState)) {
script.onload = script.onreadystatechange = null;
if (script.parentNode) {
script.parentNode.removeChild(script);
}
}
};
head.insertBefore(script, head.firstChild);
}
}
// Delegates to the transport
if (transport) {
transport.close();
}
return this;
},
// Broadcasts event to session sockets
broadcast: function(type, data) {
// TODO rename
var broadcastable = connection.broadcastable;
if (broadcastable) {
broadcastable.broadcast({type: "fire", data: {type: type, data: data}});
}
return this;
},
// For internal use only
// fires events from the server
_fire: function(data, isChunk) {
var array;
if (isChunk) {
data = opts.streamParser.call(self, data);
while (data.length) {
self._fire(data.shift());
}
return this;
}
if (support.isBinary(data)) {
array = [{type: "message", data: data}];
} else {
array = opts.inbound.call(self, data);
array = array == null ? [] : !support.isArray(array) ? [array] : array;
}
connection.lastEventIds = [];
support.each(array, function(i, event) {
var latch, args = [event.type, event.data];
opts.lastEventId = event.id;
connection.lastEventIds.push(event.id);
if (event.reply) {
args.push(function(result) {
if (!latch) {
latch = true;
self.send("reply", {id: event.id, data: result});
}
});
}
self.fire.apply(self, args).fire("_message", args);
});
return this;
},
// For internal use only
// builds an effective URL
buildURL: function(when, params) {
var p = when === "open" ?
{
transport: connection.transport,
heartbeat: opts.heartbeat,
lastEventId: opts.lastEventId
} :
when === "poll" ?
{
transport: connection.transport,
lastEventIds: connection.lastEventIds && connection.lastEventIds.join(","),
/* deprecated */lastEventId: opts.lastEventId
} :
{};
support.extend(p, {id: opts.id, _: guid++}, opts.params && opts.params[when], params);
return opts.urlBuilder.call(self, url, p, when);
}
};
// Create the final options
opts = support.extend({}, defaults, options);
if (options) {
// Array should not be deep extended
if (options.transports) {
opts.transports = slice.call(options.transports);
}
}
// Saves original URL
opts.url = url;
// Generates socket id,
opts.id = opts.idGenerator.call(self);
opts.crossDomain = !!(parts &&
// protocol and hostname
(parts[1] != location.protocol || parts[2] != location.hostname ||
// port
(parts[3] || (parts[1] === "http:" ? 80 : 443)) != (location.port || (location.protocol === "http:" ? 80 : 443))));
support.each(["connecting", "open", "message", "close", "waiting"], function(i, type) {
// Creates event helper
events[type] = callbacks(type !== "message");
events[type].order = i;
// Shortcuts for on method
var old = self[type],
on = function(fn) {
return self.on(type, fn);
};
self[type] = !old ? on : function(fn) {
return (support.isFunction(fn) ? on : old).apply(this, arguments);
};
});
// Initializes
self.on({
connecting: function() {
// From preparing state
state = "connecting";
var timeoutTimer;
// Sets timeout timer
function setTimeoutTimer() {
timeoutTimer = setTimeout(function() {
transport.close();
self.fire("close", "timeout");
}, opts.timeout);
}
// Clears timeout timer
function clearTimeoutTimer() {
clearTimeout(timeoutTimer);
}
// Makes the socket sharable
function share() {
var traceTimer,
server,
name = "socket-" + url,
servers = {
// Powered by the storage event and the localStorage
// http://www.w3.org/TR/webstorage/#event-storage
storage: function() {
// The storage event of Internet Explorer works strangely
// TODO test Internet Explorer 11
if (support.browser.msie) {
return;
}
var storage = window.localStorage;
return {
init: function() {
function onstorage(event) {
// When a deletion, newValue initialized to null
if (event.key === name && event.newValue) {
listener(event.newValue);
}
}
// Handles the storage event
support.on(window, "storage", onstorage);
self.one("close", function() {
support.off(window, "storage", onstorage);
// Defers again to clean the storage
self.one("close", function() {
storage.removeItem(name);
storage.removeItem(name + "-opened");
storage.removeItem(name + "-children");
});
});
},
broadcast: function(obj) {
var string = support.stringifyJSON(obj);
storage.setItem(name, string);
setTimeout(function() {
listener(string);
}, 50);
},
get: function(key) {
return support.parseJSON(storage.getItem(name + "-" + key));
},
set: function(key, value) {
storage.setItem(name + "-" + key, support.stringifyJSON(value));
}
};
},
// Powered by the window.open method
// https://developer.mozilla.org/en/DOM/window.open
windowref: function() {
// Internet Explorer raises an invalid argument error
// when calling the window.open method with the name containing non-word characters
var neim = name.replace(/\W/g, ""),
container = document.getElementById(neim),
win;
if (!container) {
container = document.createElement("div");
container.id = neim;
container.style.display = "none";
container.innerHTML = '<iframe name="' + neim + '" />';
document.body.appendChild(container);
}
win = container.firstChild.contentWindow;
return {
init: function() {
// Callbacks from different windows
win.callbacks = [listener];
// In Internet Explorer 8 and less, only string argument can be safely passed to the function in other window
win.fire = function(string) {
var i;
for (i = 0; i < win.callbacks.length; i++) {
win.callbacks[i](string);
}
};
},
broadcast: function(obj) {
if (!win.closed && win.fire) {
win.fire(support.stringifyJSON(obj));
}
},
get: function(key) {
return !win.closed ? win[key] : null;
},
set: function(key, value) {
if (!win.closed) {
win[key] = value;
}
}
};
}
};
// Receives send and close command from the children
function listener(string) {
var command = support.parseJSON(string), data = command.data;
if (!command.target) {
if (command.type === "fire") {
self.fire(data.type, data.data);
}
} else if (command.target === "p") {
switch (command.type) {
case "send":
self.send(data.type, data.data, data.doneCallback, data.failCallback);
break;
case "close":
self.close();
break;
}
}
}
function propagateMessageEvent(args) {
server.broadcast({target: "c", type: "message", data: args});
}
function leaveTrace() {
document.cookie = encodeURIComponent(name) + "=" +
encodeURIComponent(support.stringifyJSON({ts: support.now(), heir: (server.get("children") || [])[0]})) +
"; path=/";
}
// Chooses a server
server = servers.storage() || servers.windowref();
server.init();
// For broadcast method
connection.broadcastable = server;
// List of children sockets
server.set("children", []);
// Flag indicating the parent socket is opened
server.set("opened", false);
// Leaves traces
leaveTrace();
traceTimer = setInterval(leaveTrace, 1000);
self.on("_message", propagateMessageEvent)
.one("open", function() {
server.set("opened", true);
server.broadcast({target: "c", type: "open"});
})
.one("close", function(reason) {
// Clears trace timer
clearInterval(traceTimer);
// Removes the trace
document.cookie = encodeURIComponent(name) + "=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/";
// The heir is the parent unless unloading
server.broadcast({target: "c", type: "close", data: {reason: reason, heir: !unloading ? opts.id : (server.get("children") || [])[0]}});
self.off("_message", propagateMessageEvent);
});
}
if (opts.timeout > 0) {
setTimeoutTimer();
self.one("open", clearTimeoutTimer).one("close", clearTimeoutTimer);
}
// Share the socket if possible
if (opts.sharing && connection.transport !== "session") {
share();
}
},
open: function() {
// From connecting state
state = "opened";
var heartbeatTimer;
// Sets heartbeat timer
function setHeartbeatTimer() {
heartbeatTimer = setTimeout(function() {
self.send("heartbeat").one("heartbeat", function() {
clearHeartbeatTimer();
setHeartbeatTimer();
});
heartbeatTimer = setTimeout(function() {
transport.close();
self.fire("close", "error");
}, opts._heartbeat);
}, opts.heartbeat - opts._heartbeat);
}
// Clears heartbeat timer
function clearHeartbeatTimer() {
clearTimeout(heartbeatTimer);
}
if (opts.heartbeat > opts._heartbeat) {
setHeartbeatTimer();
self.one("close", clearHeartbeatTimer);
}
// Locks the connecting event
events.connecting.lock();
// Initializes variables related with reconnection
reconnectTimer = reconnectDelay = reconnectTry = null;
// Flushes buffer
while (buffer.length) {
self.send.apply(self, buffer.shift());
}
},
close: function() {
// From preparing, connecting, or opened state
state = "closed";
var type, event, order = events.close.order;
// Locks event whose order is lower than close event
for (type in events) {
event = events[type];
if (event.order < order) {
event.lock();
}
}
// Schedules reconnection
if (opts.reconnect) {
self.one("close", function() {
reconnectTry = reconnectTry || 1;
reconnectDelay = opts.reconnect.call(self, reconnectDelay, reconnectTry);
if (reconnectDelay !== false) {
reconnectTimer = setTimeout(function() {
self.open();
}, reconnectDelay);
self.fire("waiting", reconnectDelay, reconnectTry);
}
});
}
},
waiting: function() {
// From closed state
state = "waiting";
},
reply: function(reply) {
var fn,
id = reply.id,
data = reply.data,
exception = reply.exception,
callback = replyCallbacks[id];
if (callback) {
fn = exception ? callback.fail : callback.done;
if (fn) {
if (support.isFunction(fn)) {
fn.call(self, data);
} else {
self.fire(fn, data).fire("_message", [fn, data]);
}
delete replyCallbacks[id];
}
}
}
});
return self.open();
}
// Defines the portal
portal = {
// Creates a new socket and connects to the given url
open: function(url, options) {
// Makes url absolute to normalize URL
url = support.getAbsoluteURL(url);
sockets[url] = socket(url, options);
return portal.find(url);
},
// Finds the socket object which is mapped to the given url
find: function(url) {
var i;
// Returns the first socket in the document
if (!arguments.length) {
for (i in sockets) {
if (sockets[i]) {
return sockets[i];
}
}
return null;
}
// The url is a identifier of this socket within the document
return sockets[support.getAbsoluteURL(url)] || null;
},
// Closes all sockets
finalize: function() {
var url, socket;
for (url in sockets) {
socket = sockets[url];
if (socket.state() !== "closed") {
socket.close();
}
// To run the test suite
delete sockets[url];
}
}
};
// Most utility functions are borrowed from jQuery
portal.support = support = {
now: function() {
return new Date().getTime();
},
isArray: function(array) {
return toString.call(array) === "[object Array]";
},
isBinary: function(data) {
// True if data is an instance of Blob, ArrayBuffer or ArrayBufferView
return /^\[object\s(?:Blob|ArrayBuffer|.+Array)\]$/.test(toString.call(data));
},
isFunction: function(fn) {
return toString.call(fn) === "[object Function]";
},
getAbsoluteURL: function(url) {
var div = document.createElement("div");
// Uses an innerHTML property to obtain an absolute URL
div.innerHTML = '<a href="' + url + '"/>';
// encodeURI and decodeURI are needed to normalize URL between Internet Explorer and non-Internet Explorer,
// since Internet Explorer doesn't encode the href property value and return it - http://jsfiddle.net/Yq9M8/1/
return encodeURI(decodeURI(div.firstChild.href));
},
each: function(array, callback) {
var i;
for (i = 0; i < array.length; i++) {
callback(i, array[i]);
}
},
extend: function(target) {
var i, options, name;
for (i = 1; i < arguments.length; i++) {
if ((options = arguments[i]) != null) {
for (name in options) {
target[name] = options[name];
}
}
}
return target;
},
on: function(elem, type, fn) {
if (elem.addEventListener) {
elem.addEventListener(type, fn, false);
} else if (elem.attachEvent) {
elem.attachEvent("on" + type, fn);
}
},
off: function(elem, type, fn) {
if (elem.removeEventListener) {
elem.removeEventListener(type, fn, false);
} else if (elem.detachEvent) {
elem.detachEvent("on" + type, fn);
}
},
param: function(params) {
var prefix, s = [];
function add(key, value) {
value = support.isFunction(value) ? value() : (value == null ? "" : value);
s.push(encodeURIComponent(key) + "=" + encodeURIComponent(value));
}
function buildParams(prefix, obj) {
var name;
if (support.isArray(obj)) {
support.each(obj, function(i, v) {
if (/\[\]$/.test(prefix)) {
add(prefix, v);
} else {
buildParams(prefix + "[" + (typeof v === "object" ? i : "") + "]", v);
}
});
} else if (obj != null && toString.call(obj) === "[object Object]") {
for (name in obj) {
buildParams(prefix + "[" + name + "]", obj[name]);
}
} else {
add(prefix, obj);
}
}
for (prefix in params) {
buildParams(prefix, params[prefix]);
}
return s.join("&").replace(/%20/g, "+");
},
xhr: function() {
try {
return new window.XMLHttpRequest();
} catch (e1) {
try {
return new window.ActiveXObject("Microsoft.XMLHTTP");
} catch (e2) {}
}
},
parseJSON: function(data) {
return !data ?
null :
window.JSON && window.JSON.parse ?
window.JSON.parse(data) :
new Function("return " + data)();
},
// http://github.com/flowersinthesand/stringifyJSON
stringifyJSON: function(value) {
var escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
meta = {
'\b': '\\b',
'\t': '\\t',
'\n': '\\n',
'\f': '\\f',
'\r': '\\r',
'"': '\\"',
'\\': '\\\\'
};
function quote(string) {
return '"' + string.replace(escapable, function(a) {
var c = meta[a];
return typeof c === "string" ? c : "\\u" + ("0000" + a.charCodeAt(0).toString(16)).slice(-4);
}) + '"';
}
function f(n) {
return n < 10 ? "0" + n : n;
}
return window.JSON && window.JSON.stringify ?
window.JSON.stringify(value) :
(function str(key, holder) {
var i, v, len, partial, value = holder[key], type = typeof value;
if (value && typeof value === "object" && typeof value.toJSON === "function") {
value = value.toJSON(key);
type = typeof value;
}
switch (type) {
case "string":
return quote(value);
case "number":
return isFinite(value) ? String(value) : "null";
case "boolean":
return String(value);
case "object":
if (!value) {
return "null";
}
switch (toString.call(value)) {
case "[object Date]":
return isFinite(value.valueOf()) ?
'"' + value.getUTCFullYear() + "-" + f(value.getUTCMonth() + 1) + "-" + f(value.getUTCDate()) +
"T" + f(value.getUTCHours()) + ":" + f(value.getUTCMinutes()) + ":" + f(value.getUTCSeconds()) + "Z" + '"' :
"null";
case "[object Array]":
len = value.length;
partial = [];
for (i = 0; i < len; i++) {
partial.push(str(i, value) || "null");
}
return "[" + partial.join(",") + "]";
default:
partial = [];
for (i in value) {
if (hasOwn.call(value, i)) {
v = str(i, value);
if (v) {
partial.push(quote(i) + ":" + v);
}
}
}
return "{" + partial.join(",") + "}";
}
}