lepu-test-platform-web/node_modules/sockjs-client/lib/main.js

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'use strict';
require('./shims');
var URL = require('url-parse')
, inherits = require('inherits')
, JSON3 = require('json3')
, random = require('./utils/random')
, escape = require('./utils/escape')
, urlUtils = require('./utils/url')
, eventUtils = require('./utils/event')
, transport = require('./utils/transport')
, objectUtils = require('./utils/object')
, browser = require('./utils/browser')
, log = require('./utils/log')
, Event = require('./event/event')
, EventTarget = require('./event/eventtarget')
, loc = require('./location')
, CloseEvent = require('./event/close')
, TransportMessageEvent = require('./event/trans-message')
, InfoReceiver = require('./info-receiver')
;
var debug = function() {};
if (process.env.NODE_ENV !== 'production') {
debug = require('debug')('sockjs-client:main');
}
var transports;
// follow constructor steps defined at http://dev.w3.org/html5/websockets/#the-websocket-interface
function SockJS(url, protocols, options) {
if (!(this instanceof SockJS)) {
return new SockJS(url, protocols, options);
}
if (arguments.length < 1) {
throw new TypeError("Failed to construct 'SockJS: 1 argument required, but only 0 present");
}
EventTarget.call(this);
this.readyState = SockJS.CONNECTING;
this.extensions = '';
this.protocol = '';
// non-standard extension
options = options || {};
if (options.protocols_whitelist) {
log.warn("'protocols_whitelist' is DEPRECATED. Use 'transports' instead.");
}
this._transportsWhitelist = options.transports;
this._transportOptions = options.transportOptions || {};
var sessionId = options.sessionId || 8;
if (typeof sessionId === 'function') {
this._generateSessionId = sessionId;
} else if (typeof sessionId === 'number') {
this._generateSessionId = function() {
return random.string(sessionId);
};
} else {
throw new TypeError('If sessionId is used in the options, it needs to be a number or a function.');
}
this._server = options.server || random.numberString(1000);
// Step 1 of WS spec - parse and validate the url. Issue #8
var parsedUrl = new URL(url);
if (!parsedUrl.host || !parsedUrl.protocol) {
throw new SyntaxError("The URL '" + url + "' is invalid");
} else if (parsedUrl.hash) {
throw new SyntaxError('The URL must not contain a fragment');
} else if (parsedUrl.protocol !== 'http:' && parsedUrl.protocol !== 'https:') {
throw new SyntaxError("The URL's scheme must be either 'http:' or 'https:'. '" + parsedUrl.protocol + "' is not allowed.");
}
var secure = parsedUrl.protocol === 'https:';
// Step 2 - don't allow secure origin with an insecure protocol
if (loc.protocol === 'https:' && !secure) {
throw new Error('SecurityError: An insecure SockJS connection may not be initiated from a page loaded over HTTPS');
}
// Step 3 - check port access - no need here
// Step 4 - parse protocols argument
if (!protocols) {
protocols = [];
} else if (!Array.isArray(protocols)) {
protocols = [protocols];
}
// Step 5 - check protocols argument
var sortedProtocols = protocols.sort();
sortedProtocols.forEach(function(proto, i) {
if (!proto) {
throw new SyntaxError("The protocols entry '" + proto + "' is invalid.");
}
if (i < (sortedProtocols.length - 1) && proto === sortedProtocols[i + 1]) {
throw new SyntaxError("The protocols entry '" + proto + "' is duplicated.");
}
});
// Step 6 - convert origin
var o = urlUtils.getOrigin(loc.href);
this._origin = o ? o.toLowerCase() : null;
// remove the trailing slash
parsedUrl.set('pathname', parsedUrl.pathname.replace(/\/+$/, ''));
// store the sanitized url
this.url = parsedUrl.href;
debug('using url', this.url);
// Step 7 - start connection in background
// obtain server info
// http://sockjs.github.io/sockjs-protocol/sockjs-protocol-0.3.3.html#section-26
this._urlInfo = {
nullOrigin: !browser.hasDomain()
, sameOrigin: urlUtils.isOriginEqual(this.url, loc.href)
, sameScheme: urlUtils.isSchemeEqual(this.url, loc.href)
};
this._ir = new InfoReceiver(this.url, this._urlInfo);
this._ir.once('finish', this._receiveInfo.bind(this));
}
inherits(SockJS, EventTarget);
function userSetCode(code) {
return code === 1000 || (code >= 3000 && code <= 4999);
}
SockJS.prototype.close = function(code, reason) {
// Step 1
if (code && !userSetCode(code)) {
throw new Error('InvalidAccessError: Invalid code');
}
// Step 2.4 states the max is 123 bytes, but we are just checking length
if (reason && reason.length > 123) {
throw new SyntaxError('reason argument has an invalid length');
}
// Step 3.1
if (this.readyState === SockJS.CLOSING || this.readyState === SockJS.CLOSED) {
return;
}
// TODO look at docs to determine how to set this
var wasClean = true;
this._close(code || 1000, reason || 'Normal closure', wasClean);
};
SockJS.prototype.send = function(data) {
// #13 - convert anything non-string to string
// TODO this currently turns objects into [object Object]
if (typeof data !== 'string') {
data = '' + data;
}
if (this.readyState === SockJS.CONNECTING) {
throw new Error('InvalidStateError: The connection has not been established yet');
}
if (this.readyState !== SockJS.OPEN) {
return;
}
this._transport.send(escape.quote(data));
};
SockJS.version = require('./version');
SockJS.CONNECTING = 0;
SockJS.OPEN = 1;
SockJS.CLOSING = 2;
SockJS.CLOSED = 3;
SockJS.prototype._receiveInfo = function(info, rtt) {
debug('_receiveInfo', rtt);
this._ir = null;
if (!info) {
this._close(1002, 'Cannot connect to server');
return;
}
// establish a round-trip timeout (RTO) based on the
// round-trip time (RTT)
this._rto = this.countRTO(rtt);
// allow server to override url used for the actual transport
this._transUrl = info.base_url ? info.base_url : this.url;
info = objectUtils.extend(info, this._urlInfo);
debug('info', info);
// determine list of desired and supported transports
var enabledTransports = transports.filterToEnabled(this._transportsWhitelist, info);
this._transports = enabledTransports.main;
debug(this._transports.length + ' enabled transports');
this._connect();
};
SockJS.prototype._connect = function() {
for (var Transport = this._transports.shift(); Transport; Transport = this._transports.shift()) {
debug('attempt', Transport.transportName);
if (Transport.needBody) {
if (!global.document.body ||
(typeof global.document.readyState !== 'undefined' &&
global.document.readyState !== 'complete' &&
global.document.readyState !== 'interactive')) {
debug('waiting for body');
this._transports.unshift(Transport);
eventUtils.attachEvent('load', this._connect.bind(this));
return;
}
}
// calculate timeout based on RTO and round trips. Default to 5s
var timeoutMs = (this._rto * Transport.roundTrips) || 5000;
this._transportTimeoutId = setTimeout(this._transportTimeout.bind(this), timeoutMs);
debug('using timeout', timeoutMs);
var transportUrl = urlUtils.addPath(this._transUrl, '/' + this._server + '/' + this._generateSessionId());
var options = this._transportOptions[Transport.transportName];
debug('transport url', transportUrl);
var transportObj = new Transport(transportUrl, this._transUrl, options);
transportObj.on('message', this._transportMessage.bind(this));
transportObj.once('close', this._transportClose.bind(this));
transportObj.transportName = Transport.transportName;
this._transport = transportObj;
return;
}
this._close(2000, 'All transports failed', false);
};
SockJS.prototype._transportTimeout = function() {
debug('_transportTimeout');
if (this.readyState === SockJS.CONNECTING) {
if (this._transport) {
this._transport.close();
}
this._transportClose(2007, 'Transport timed out');
}
};
SockJS.prototype._transportMessage = function(msg) {
debug('_transportMessage', msg);
var self = this
, type = msg.slice(0, 1)
, content = msg.slice(1)
, payload
;
// first check for messages that don't need a payload
switch (type) {
case 'o':
this._open();
return;
case 'h':
this.dispatchEvent(new Event('heartbeat'));
debug('heartbeat', this.transport);
return;
}
if (content) {
try {
payload = JSON3.parse(content);
} catch (e) {
debug('bad json', content);
}
}
if (typeof payload === 'undefined') {
debug('empty payload', content);
return;
}
switch (type) {
case 'a':
if (Array.isArray(payload)) {
payload.forEach(function(p) {
debug('message', self.transport, p);
self.dispatchEvent(new TransportMessageEvent(p));
});
}
break;
case 'm':
debug('message', this.transport, payload);
this.dispatchEvent(new TransportMessageEvent(payload));
break;
case 'c':
if (Array.isArray(payload) && payload.length === 2) {
this._close(payload[0], payload[1], true);
}
break;
}
};
SockJS.prototype._transportClose = function(code, reason) {
debug('_transportClose', this.transport, code, reason);
if (this._transport) {
this._transport.removeAllListeners();
this._transport = null;
this.transport = null;
}
if (!userSetCode(code) && code !== 2000 && this.readyState === SockJS.CONNECTING) {
this._connect();
return;
}
this._close(code, reason);
};
SockJS.prototype._open = function() {
debug('_open', this._transport.transportName, this.readyState);
if (this.readyState === SockJS.CONNECTING) {
if (this._transportTimeoutId) {
clearTimeout(this._transportTimeoutId);
this._transportTimeoutId = null;
}
this.readyState = SockJS.OPEN;
this.transport = this._transport.transportName;
this.dispatchEvent(new Event('open'));
debug('connected', this.transport);
} else {
// The server might have been restarted, and lost track of our
// connection.
this._close(1006, 'Server lost session');
}
};
SockJS.prototype._close = function(code, reason, wasClean) {
debug('_close', this.transport, code, reason, wasClean, this.readyState);
var forceFail = false;
if (this._ir) {
forceFail = true;
this._ir.close();
this._ir = null;
}
if (this._transport) {
this._transport.close();
this._transport = null;
this.transport = null;
}
if (this.readyState === SockJS.CLOSED) {
throw new Error('InvalidStateError: SockJS has already been closed');
}
this.readyState = SockJS.CLOSING;
setTimeout(function() {
this.readyState = SockJS.CLOSED;
if (forceFail) {
this.dispatchEvent(new Event('error'));
}
var e = new CloseEvent('close');
e.wasClean = wasClean || false;
e.code = code || 1000;
e.reason = reason;
this.dispatchEvent(e);
this.onmessage = this.onclose = this.onerror = null;
debug('disconnected');
}.bind(this), 0);
};
// See: http://www.erg.abdn.ac.uk/~gerrit/dccp/notes/ccid2/rto_estimator/
// and RFC 2988.
SockJS.prototype.countRTO = function(rtt) {
// In a local environment, when using IE8/9 and the `jsonp-polling`
// transport the time needed to establish a connection (the time that pass
// from the opening of the transport to the call of `_dispatchOpen`) is
// around 200msec (the lower bound used in the article above) and this
// causes spurious timeouts. For this reason we calculate a value slightly
// larger than that used in the article.
if (rtt > 100) {
return 4 * rtt; // rto > 400msec
}
return 300 + rtt; // 300msec < rto <= 400msec
};
module.exports = function(availableTransports) {
transports = transport(availableTransports);
require('./iframe-bootstrap')(SockJS, availableTransports);
return SockJS;
};