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eshq.js.st
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eshq.js.st
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(function() {
var origin = "$origin$";
if (typeof(window.addEventListener) == "undefined") {
window.addEventListener = function(name, fn) {
window.attachEvent("on" + name, fn);
};
}
var post = function(path, data, callback) {
var xhr = new XMLHttpRequest();
xhr.open('POST', path, true);
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xhr.onreadystatechange = callback;
xhr.send(data);
};
var Sub = function(channel, options) {
for (var i in options) {
this[i] = options[i];
};
this.channel = channel;
}
var subs = {};
var onMessage = function(event) {
if (event.origin !== origin) { return; }
var data = JSON.parse(event.data);
if (!data.eshqEvent) { return; }
var sub = subs[data.channel];
if (!sub) { return; }
if (sub[data.eshqEvent]) { sub[data.eshqEvent].call(null, data.originalEvent); }
};
window.addEventListener("message", onMessage, false);
var getSocket = function(channel, url) {
post(url, "channel=" + channel, function() {
if (this.readyState == 4 && this.status == 200) {
var resp = JSON.parse(this.responseText);
openChannel(channel, resp.socket);
}
});
};
var openChannel = function(channel, socket) {
var iframe = document.createElement("iframe");
iframe.setAttribute("style", "display: none;");
iframe.setAttribute("src", origin + "/iframe?channel=" + channel + "&socket=" + socket + "&t=" + new Date().getTime());
document.body.appendChild(iframe);
subs[channel].frame = iframe;
};
window.eshq = {
open: function(channel, options) {
subs[channel] = new Sub(channel, options || {});
getSocket(channel, options.auth_url || "/eshq/socket");
},
send: function(channel, data) {
var sub = subs[channel];
if (!sub) throw "You must open a channel before sending to it";
sub.frame.contentWindow.postMessage(data, "*");
}
};
})();