Add node client support for bearer token authentication

lib/node/index.js

@@ -468,18 +468,30 @@ Request.prototype._redirect = function(res){
  *   .auth('tobi', 'learnboost')
  *   .auth('tobi:learnboost')
  *   .auth('tobi')
+ *   .auth(accessToken, { type: 'bearer' })
  *
  * @param {String} user
- * @param {String} pass
+ * @param {String} [pass]
+ * @param {Object} [options] options with authorization type 'basic' or 'bearer' ('basic' is default)
  * @return {Request} for chaining
  * @api public
  */
 
-Request.prototype.auth = function(user, pass){
+Request.prototype.auth = function(user, pass, options){
   if (1 === arguments.length) pass = '';
-  if (!~user.indexOf(':')) user = user + ':';
-  var str = new Buffer(user + pass).toString('base64');
-  return this.set('Authorization', 'Basic ' + str);
+  if (2 === arguments.length && typeof pass === 'object') options = pass;
+  if (!options) {
+    options = { type: 'basic' };
+  }
+  switch (options.type) {
+    case 'bearer':
+      return this.set('Authorization', 'Bearer ' + user);    
+
+    default: // 'basic'
+      if (!~user.indexOf(':')) user = user + ':';
+      var str = new Buffer(user + pass).toString('base64');
+      return this.set('Authorization', 'Basic ' + str);    
+  }
 };
 
 /**