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/**
@namespace
*/
(function(module, ns) {
var Native;
if (typeof(window) === 'undefined') {
Native = require('xmlhttprequest').XMLHttpRequest;
} else {
Native = window.XMLHttpRequest;
}
/**
* Creates a XHR wrapper.
* Depending on the platform this is loaded
* from the correct wrapper type will be used.
*
* Options are derived from properties on the prototype.
* See each property for its default value.
*
* @class
* @name Caldav.Xhr
* @param {Object} options options for xhr.
* @param {String} [options.method="GET"] any HTTP verb like 'GET' or 'POST'.
* @param {Boolean} [options.async] false will indicate
* a synchronous request.
* @param {Object} [options.headers] full of http headers.
* @param {Object} [options.data] post data.
*/
function Xhr(options) {
var key;
if (typeof(options) === 'undefined') {
options = {};
}
for (key in options) {
if (Object.hasOwnProperty.call(options, key)) {
this[key] = options[key];
}
}
}
Xhr.prototype = {
globalXhrOptions: null,
xhrClass: Native,
xhr: null,
method: 'GET',
async: true,
waiting: false,
user: null,
password: null,
url: null,
streaming: true,
headers: {},
data: null,
_serialize: function _serialize() {
return this.data;
},
/**
* @param {String} user basic auth user.
* @param {String} password basic auth pass.
* @return {String} basic auth token.
*/
_credentials: function(user, pass) {
// this code should never run in nodejs.
return 'Basic ' + window.btoa(
user + ':' + pass
);
},
/**
* Aborts the request if it has already been sent.
* @param {Function=} cb An optional callback function.
*/
abort: function(cb) {
if (this.waiting) {
this.xhr.abort();
this.waiting = false;
}
if (cb !== undefined) {
cb();
}
},
_buildXHR: function(callback) {
var header;
if (typeof(callback) === 'undefined') {
callback = this.callback;
}
this.xhr = new this.xhrClass(
this.globalXhrOptions ? this.globalXhrOptions : undefined);
// This hack is in place due to some platform
// bug in gecko when using mozSystem xhr
// the credentials only seem to work as expected
// when constructing them manually.
if (!this.globalXhrOptions || !this.globalXhrOptions.mozSystem) {
this.xhr.open(
this.method, this.url, this.async, this.user, this.password);
} else {
this.xhr.open(this.method, this.url, this.async);
this.xhr.setRequestHeader('Authorization', this._credentials(
this.user,
this.password
));
}
var useMozChunkedText = false;
if (
this.streaming &&
this.globalXhrOptions &&
this.globalXhrOptions.useMozChunkedText
) {
useMozChunkedText = true;
this.xhr.responseType = 'moz-chunked-text';
}
for (header in this.headers) {
if (Object.hasOwnProperty.call(this.headers, header)) {
this.xhr.setRequestHeader(header, this.headers[header]);
}
}
var hasProgressEvents = false;
// check for progress event support.
if (this.streaming) {
if ('onprogress' in this.xhr) {
hasProgressEvents = true;
var last = 0;
if (useMozChunkedText) {
this.xhr.onprogress = (function onChunkedProgress(event) {
if (this.ondata) {
this.ondata(this.xhr.responseText);
}
}.bind(this));
} else {
this.xhr.onprogress = (function onProgress(event) {
var chunk = this.xhr.responseText.substr(last, event.loaded);
last = event.loaded;
if (this.ondata) {
this.ondata(chunk);
}
}.bind(this));
}
}
}
this.xhr.onreadystatechange = (function onReadyStateChange() {
var data;
if (this.xhr.readyState === 4) {
data = this.xhr.responseText;
// emulate progress events for node...
// this really lame we should probably just
// use a real http request for node but this
// will let us do some testing via node for now.
if (!hasProgressEvents && this.ondata) {
this.ondata(data);
}
this.waiting = false;
callback(null, this.xhr);
}
}.bind(this));
this.waiting = true;
return this.xhr;
},
/**
* Sends request to server.
*
* @param {Function} callback success/failure handler.
*/
send: function send(callback) {
var xhr = this._buildXHR(callback);
xhr.send(this._serialize());
return xhr;
}
};
module.exports = Xhr;
}.apply(
this,
(this.Caldav) ?
[Caldav('xhr'), Caldav] :
[module, require('./caldav')]
));
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