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/**
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* @file
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*
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* Rewrites XMLHttpRequest to automatically send CSRF token with it. In theory
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* plays nice with other JavaScript libraries, needs testing though.
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*/
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// Here are the basic overloaded method definitions
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// The wrapper must be set BEFORE onreadystatechange is written to, since
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// a bug in ActiveXObject prevents us from properly testing for it.
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CsrfMagic = function(real) {
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// try to make it ourselves, if you didn't pass it
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if (!real) try { real = new XMLHttpRequest; } catch (e) {;}
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if (!real) try { real = new ActiveXObject('Msxml2.XMLHTTP'); } catch (e) {;}
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if (!real) try { real = new ActiveXObject('Microsoft.XMLHTTP'); } catch (e) {;}
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if (!real) try { real = new ActiveXObject('Msxml2.XMLHTTP.4.0'); } catch (e) {;}
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this.csrf = real;
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// properties
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var csrfMagic = this;
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real.onreadystatechange = function() {
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csrfMagic._updateProps();
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return csrfMagic.onreadystatechange ? csrfMagic.onreadystatechange() : null;
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};
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csrfMagic._updateProps();
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}
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CsrfMagic.prototype = {
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open: function(method, url, async, username, password) {
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if (method == 'POST') this.csrf_isPost = true;
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// deal with Opera bug, thanks jQuery
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if (username) return this.csrf_open(method, url, async, username, password);
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else return this.csrf_open(method, url, async);
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},
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csrf_open: function(method, url, async, username, password) {
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if (username) return this.csrf.open(method, url, async, username, password);
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else return this.csrf.open(method, url, async);
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},
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send: function(data) {
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if (!this.csrf_isPost) return this.csrf_send(data);
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prepend = csrfMagicName + '=' + csrfMagicToken + '&';
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// XXX: Removed to eliminate 'Refused to set unsafe header "Content-length" ' errors in modern browsers
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// if (this.csrf_purportedLength === undefined) {
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// this.csrf_setRequestHeader("Content-length", this.csrf_purportedLength + prepend.length);
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// delete this.csrf_purportedLength;
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// }
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delete this.csrf_isPost;
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return this.csrf_send(prepend + data);
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},
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csrf_send: function(data) {
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return this.csrf.send(data);
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},
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setRequestHeader: function(header, value) {
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// We have to auto-set this at the end, since we don't know how long the
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// nonce is when added to the data.
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if (this.csrf_isPost && header == "Content-length") {
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this.csrf_purportedLength = value;
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return;
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}
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return this.csrf_setRequestHeader(header, value);
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},
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csrf_setRequestHeader: function(header, value) {
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return this.csrf.setRequestHeader(header, value);
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},
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abort: function() {
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return this.csrf.abort();
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},
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getAllResponseHeaders: function() {
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return this.csrf.getAllResponseHeaders();
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},
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getResponseHeader: function(header) {
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return this.csrf.getResponseHeader(header);
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} // ,
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}
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// proprietary
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CsrfMagic.prototype._updateProps = function() {
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this.readyState = this.csrf.readyState;
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if (this.readyState == 4) {
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this.responseText = this.csrf.responseText;
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this.responseXML = this.csrf.responseXML;
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this.status = this.csrf.status;
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this.statusText = this.csrf.statusText;
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}
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}
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CsrfMagic.process = function(base) {
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if(typeof base == 'object') {
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base[csrfMagicName] = csrfMagicToken;
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return base;
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}
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var prepend = csrfMagicName + '=' + csrfMagicToken;
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if (base) return prepend + '&' + base;
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return prepend;
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}
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// callback function for when everything on the page has loaded
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CsrfMagic.end = function() {
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// This rewrites forms AGAIN, so in case buffering didn't work this
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// certainly will.
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forms = document.getElementsByTagName('form');
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for (var i = 0; i < forms.length; i++) {
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form = forms[i];
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if (form.method.toUpperCase() !== 'POST') continue;
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if (form.elements[csrfMagicName]) continue;
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var input = document.createElement('input');
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input.setAttribute('name', csrfMagicName);
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input.setAttribute('value', csrfMagicToken);
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input.setAttribute('type', 'hidden');
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form.appendChild(input);
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}
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}
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// Sets things up for Mozilla/Opera/nice browsers
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// We very specifically match against Internet Explorer, since they haven't
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// implemented prototypes correctly yet.
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if (window.XMLHttpRequest && window.XMLHttpRequest.prototype && '\v' != 'v') {
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var x = XMLHttpRequest.prototype;
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var c = CsrfMagic.prototype;
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// Save the original functions
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x.csrf_open = x.open;
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x.csrf_send = x.send;
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x.csrf_setRequestHeader = x.setRequestHeader;
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// Notice that CsrfMagic is itself an instantiatable object, but only
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// open, send and setRequestHeader are necessary as decorators.
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x.open = c.open;
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x.send = c.send;
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x.setRequestHeader = c.setRequestHeader;
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} else {
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// The only way we can do this is by modifying a library you have been
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// using. We support YUI, script.aculo.us, prototype, MooTools,
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// jQuery, Ext and Dojo.
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if (window.jQuery) {
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// jQuery didn't implement a new XMLHttpRequest function, so we have
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// to do this the hard way.
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jQuery.csrf_ajax = jQuery.ajax;
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jQuery.ajax = function( s ) {
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if (s.type && s.type.toUpperCase() == 'POST') {
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s = jQuery.extend(true, s, jQuery.extend(true, {}, jQuery.ajaxSettings, s));
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if ( s.data && s.processData && typeof s.data != "string" ) {
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s.data = jQuery.param(s.data);
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}
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s.data = CsrfMagic.process(s.data);
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}
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return jQuery.csrf_ajax( s );
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}
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}
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if (window.Prototype) {
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// This works for script.aculo.us too
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Ajax.csrf_getTransport = Ajax.getTransport;
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Ajax.getTransport = function() {
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return new CsrfMagic(Ajax.csrf_getTransport());
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}
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}
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if (window.MooTools) {
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Browser.csrf_Request = Browser.Request;
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Browser.Request = function () {
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return new CsrfMagic(Browser.csrf_Request());
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}
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}
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if (window.YAHOO) {
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// old YUI API
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YAHOO.util.Connect.csrf_createXhrObject = YAHOO.util.Connect.createXhrObject;
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YAHOO.util.Connect.createXhrObject = function (transaction) {
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obj = YAHOO.util.Connect.csrf_createXhrObject(transaction);
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obj.conn = new CsrfMagic(obj.conn);
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return obj;
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}
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}
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if (window.Ext) {
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// Ext can use other js libraries as loaders, so it has to come last
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// Ext's implementation is pretty identical to Yahoo's, but we duplicate
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// it for comprehensiveness's sake.
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Ext.lib.Ajax.csrf_createXhrObject = Ext.lib.Ajax.createXhrObject;
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Ext.lib.Ajax.createXhrObject = function (transaction) {
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obj = Ext.lib.Ajax.csrf_createXhrObject(transaction);
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obj.conn = new CsrfMagic(obj.conn);
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return obj;
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}
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}
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if (window.dojo) {
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// NOTE: this doesn't work with latest dojo
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dojo.csrf__xhrObj = dojo._xhrObj;
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dojo._xhrObj = function () {
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return new CsrfMagic(dojo.csrf__xhrObj());
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}
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}
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}
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