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// don't break if there's no console
if(typeof(console) === "undefined")
{
console = { log: function() {} };
}
var FO = FO || {};
var fo_jsonp_callback_id = 0;
var fo_jsonp_callbacks = {};
function fo_jsonp_get_callback(cb_id)
{
if(fo_jsonp_callbacks[cb_id])
{
return fo_jsonp_callbacks[cb_id];
}
else
{
console.log("no callback with id " + cb_id);
return function(result) {};
}
}
// FO.Request has onFinished(int code, object result) and onError(int reason) callback members
// error reasons: 0=http, 1=timeout
// note: failed json parse on http body results in empty object {}, not error
FO.Request = function()
{
if(!(this instanceof FO.Request))
throw new Error("Constructor called as a function");
}
FO.Request.prototype.start = function(method, url, headers, body)
{
this._cors = false;
if("withCredentials" in new XMLHttpRequest())
this._cors = true;
var self = this;
this._timer = setTimeout(function() { self._timeout(); }, 60000);
if(this._cors)
{
this._xhr = new XMLHttpRequest();
this._xhr.onreadystatechange = function() { self._xhr_readystatechange(); };
this._xhr.open(method, url, true);
for(var key in headers)
{
if(!headers.hasOwnProperty(key))
continue;
this._xhr.setRequestHeader(key, headers[key]);
}
this._xhr.send(body);
}
else
{
var head = document.getElementsByTagName("head")[0];
var script = document.createElement("script");
script.type = "text/javascript";
this._cb_id = fo_jsonp_callback_id.toString();
++fo_jsonp_callback_id;
this._script_id = "fo-jsonp-script-" + this._cb_id;
script.id = this._script_id;
fo_jsonp_callbacks[this._cb_id] = function(result) { self._jsonp_callback(result); };
var param_list = new Array();
param_list.push("callback=" + encodeURIComponent("fo_jsonp_get_callback(\"" + this._cb_id + "\")"));
if(method != "GET")
param_list.push("method=" + encodeURIComponent(method));
if(headers)
param_list.push("headers=" + encodeURIComponent(JSON.stringify(headers)));
if(body)
param_list.push("body=" + encodeURIComponent(body));
var params = param_list.join("&");
var src;
if(url.indexOf("?") != -1)
src = url + "&" + params;
else
src = url + "?" + params;
script.src = src;
console.log("FO.Request json-p " + this._cb_id + " " + src);
head.appendChild(script);
}
}
FO.Request.prototype.abort = function()
{
clearTimeout(this._timer);
this._timer = null;
this._cancelreq();
}
FO.Request.prototype._cancelreq = function()
{
if(this._cors)
{
this._xhr.onreadystatechange = function() {}
this._xhr.abort();
this._xhr = null;
}
else
{
console.log("FO.Request json-p " + this._cb_id + " timeout");
delete fo_jsonp_callbacks[this._cb_id];
var script = document.getElementById(this._script_id);
script.parentNode.removeChild(script);
this._cb_id = null;
this._script_id = null;
}
}
FO.Request.prototype._xhr_readystatechange = function()
{
if(this._xhr.readyState === 4)
{
clearTimeout(this._timer);
this._timer = null;
var status = this._xhr.status;
var responseText = this._xhr.responseText;
this._xhr = null;
if(status)
{
var result;
try
{
result = JSON.parse(responseText);
}
catch(e)
{
result = {}
}
this._finished(status, result);
}
else
this._error(0);
}
}
FO.Request.prototype._jsonp_callback = function(result)
{
console.log("FO.Request json-p " + this._cb_id + " finished");
clearTimeout(this._timer);
this._timer = null;
delete fo_jsonp_callbacks[this._cb_id];
var script = document.getElementById(this._script_id);
script.parentNode.removeChild(script);
this._cb_id = null;
this._script_id = null;
this._finished(result.status, result.value);
}
FO.Request.prototype._timeout = function()
{
this._timer = null;
this._cancelreq();
this._error(1);
}
FO.Request.prototype._finished = function(code, result)
{
if(this.onFinished)
this.onFinished(code, result);
}
FO.Request.prototype._error = function(reason)
{
if(this.onError)
this.onError(reason);
}
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