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digestAuthRequest.js
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digestAuthRequest.js
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// digest auth request
// by @inorganik
// dependent upon CryptoJS MD5 hashing:
// http://crypto-js.googlecode.com/svn/tags/3.1.2/build/rollups/md5.js
var digestAuthRequest = function (method, url, username, password) {
var self = this;
if (typeof CryptoJS === 'undefined' && typeof require === 'function') {
var CryptoJS = require('crypto-js');
}
this.scheme = null; // we just echo the scheme, to allow for 'Digest', 'X-Digest', 'JDigest' etc
this.nonce = null; // server issued nonce
this.realm = null; // server issued realm
this.qop = null; // "quality of protection" - '' or 'auth' or 'auth-int'
this.response = null; // hashed response to server challenge
this.opaque = null; // hashed response to server challenge
this.nc = 1; // nonce count - increments with each request used with the same nonce
this.cnonce = null; // client nonce
// settings
this.timeout = 10000; // timeout
this.loggingOn = true; // toggle console logging
// determine if a post, so that request will send data
this.post = false;
if (method.toLowerCase() === 'post' || method.toLowerCase() === 'put') {
this.post = true;
}
// start here
// successFn - will be passed JSON data
// errorFn - will be passed error status code
// data - optional, for POSTS
this.request = function(successFn, errorFn, data) {
// posts data as JSON if there is any
if (data) {
self.data = JSON.stringify(data);
}
self.successFn = successFn;
self.errorFn = errorFn;
if (!self.nonce) {
self.makeUnauthenticatedRequest(self.data);
} else {
self.makeAuthenticatedRequest();
}
}
this.makeUnauthenticatedRequest = function(data) {
self.firstRequest = new XMLHttpRequest();
self.firstRequest.open(method, url, true);
self.firstRequest.timeout = self.timeout;
// if we are posting, add appropriate headers
if (self.post) {
self.firstRequest.setRequestHeader('Content-type', 'application/json');
}
self.firstRequest.onreadystatechange = function() {
// 2: received headers, 3: loading, 4: done
if (self.firstRequest.readyState === 2) {
var responseHeaders = self.firstRequest.getAllResponseHeaders();
responseHeaders = responseHeaders.split('\n');
// get authenticate header
var digestHeaders;
for(var i = 0; i < responseHeaders.length; i++) {
if (responseHeaders[i].match(/www-authenticate/i) != null) {
digestHeaders = responseHeaders[i];
}
}
if (digestHeaders != null) {
// parse auth header and get digest auth keys
digestHeaders = digestHeaders.slice(digestHeaders.indexOf(':') + 1, -1);
digestHeaders = digestHeaders.split(',');
self.scheme = digestHeaders[0].split(/\s/)[1];
for (var i = 0; i < digestHeaders.length; i++) {
var equalIndex = digestHeaders[i].indexOf('='),
key = digestHeaders[i].substring(0, equalIndex),
val = digestHeaders[i].substring(equalIndex + 1);
val = val.replace(/['"]+/g, '');
// find realm
if (key.match(/realm/i) != null) {
self.realm = val;
}
// find nonce
if (key.match(/nonce/i) != null) {
self.nonce = val;
}
// find opaque
if (key.match(/opaque/i) != null) {
self.opaque = val;
}
// find QOP
if (key.match(/qop/i) != null) {
self.qop = val;
}
}
// client generated keys
self.cnonce = self.generateCnonce();
self.nc++;
// if logging, show headers received:
self.log('received headers:');
self.log(' realm: '+self.realm);
self.log(' nonce: '+self.nonce);
self.log(' opaque: '+self.opaque);
self.log(' qop: '+self.qop);
// now we can make an authenticated request
self.makeAuthenticatedRequest();
}
}
if (self.firstRequest.readyState === 4) {
if (self.firstRequest.status === 200) {
self.log('Authentication not required for '+url);
if (self.firstRequest.responseText !== 'undefined') {
if (self.firstRequest.responseText.length > 0) {
// If JSON, parse and return object
if (self.isJson(self.firstRequest.responseText)) {
self.successFn(JSON.parse(self.firstRequest.responseText));
} else {
self.successFn(self.firstRequest.responseText);
}
}
} else {
self.successFn();
}
}
}
}
// send
if (self.post) {
// in case digest auth not required
self.firstRequest.send(self.data);
} else {
self.firstRequest.send();
}
self.log('Unauthenticated request to '+url);
// handle error
self.firstRequest.onerror = function() {
if (self.firstRequest.status !== 401) {
self.log('Error ('+self.firstRequest.status+') on unauthenticated request to '+url);
self.errorFn(self.firstRequest.status);
}
}
}
this.makeAuthenticatedRequest= function() {
self.response = self.formulateResponse();
self.authenticatedRequest = new XMLHttpRequest();
self.authenticatedRequest.open(method, url, true);
self.authenticatedRequest.timeout = self.timeout;
var digestAuthHeader = self.scheme+' '+
'username="'+username+'", '+
'realm="'+self.realm+'", '+
'nonce="'+self.nonce+'", '+
'uri="'+url+'", '+
'response="'+self.response+'", '+
'opaque="'+self.opaque+'", '+
'qop='+self.qop+', '+
'nc='+('00000000' + self.nc).slice(-8)+', '+
'cnonce="'+self.cnonce+'"';
self.authenticatedRequest.setRequestHeader('Authorization', digestAuthHeader);
self.log('digest auth header response to be sent:');
self.log(digestAuthHeader);
// if we are posting, add appropriate headers
if (self.post) {
self.authenticatedRequest.setRequestHeader('Content-type', 'application/json');
}
self.authenticatedRequest.onload = function() {
// success
if (self.authenticatedRequest.status >= 200 && self.authenticatedRequest.status < 400) {
// increment nonce count
self.nc++;
// return data
if (self.authenticatedRequest.responseText !== 'undefined' && self.authenticatedRequest.responseText.length > 0 ) {
// If JSON, parse and return object
if (self.isJson(self.authenticatedRequest.responseText)) {
self.successFn(JSON.parse(self.authenticatedRequest.responseText));
} else {
self.successFn(self.authenticatedRequest.responseText);
}
} else {
self.successFn();
}
}
// failure
else {
self.nonce = null;
self.errorFn(self.authenticatedRequest.status);
}
}
// handle errors
self.authenticatedRequest.onerror = function() {
self.log('Error ('+self.authenticatedRequest.status+') on authenticated request to '+url);
self.nonce = null;
self.errorFn(self.authenticatedRequest.status);
};
// send
if (self.post) {
self.authenticatedRequest.send(self.data);
} else {
self.authenticatedRequest.send();
}
self.log('Authenticated request to '+url);
}
// hash response based on server challenge
this.formulateResponse = function() {
var HA1 = CryptoJS.MD5(username+':'+self.realm+':'+password).toString();
var HA2 = CryptoJS.MD5(method+':'+url).toString();
var response = CryptoJS.MD5(HA1+':'+
self.nonce+':'+
('00000000' + self.nc).slice(-8)+':'+
self.cnonce+':'+
self.qop+':'+
HA2).toString();
return response;
}
// generate 16 char client nonce
this.generateCnonce = function() {
var characters = 'abcdef0123456789';
var token = '';
for (var i = 0; i < 16; i++) {
var randNum = Math.round(Math.random() * characters.length);
token += characters.substr(randNum, 1);
}
return token;
}
this.abort = function() {
self.log('[digestAuthRequest] Aborted request to '+url);
if (self.firstRequest != null) {
if (self.firstRequest.readyState != 4) self.firstRequest.abort();
}
if (self.authenticatedRequest != null) {
if (self.authenticatedRequest.readyState != 4) self.authenticatedRequest.abort();
}
}
this.isJson = function(str) {
try {
JSON.parse(str);
} catch (e) {
return false;
}
return true;
}
this.log = function(str) {
if (self.loggingOn) {
console.log('[digestAuthRequest] '+str);
}
}
this.version = function() { return '0.8.0' }
}