Rest API changes for adding logos via admin site

lib/api.ui.js

@@ -82,4 +82,22 @@ var getSkin = module.exports.getSkin = function(restCtx, callback) {
  */
 var getSkinVariables = module.exports.getSkinVariables = function(restCtx, tenantAlias, callback) {
     RestUtil.RestRequest(restCtx, '/api/ui/skin/variables', 'GET', {'tenant': tenantAlias}, callback);
-};
+};
+
+/**
+ * Upload a new logo file to use as the tenant logo
+ *
+ * @param  {RestContext}    restCtx                 Standard REST Context object associated to an administrator.
+ * @param  {Function}       fileGenerator           A method that returns an open stream to a file
+ * @param  {String}         tenantAlias             The alias of the tenant for which the variables should be retrieved.
+ * @param  {Function}       callback                Standard callback method
+ * @param  {Object}         callback.err            Error object containing error code and error message
+ * @param  {Object}         callback.url            The variables grouped by their respective groups.
+ */
+var uploadLogo = module.exports.uploadLogo = function(restCtx, file, tenantAlias, callback) {
+    var params = {
+        'file': file,
+        'tenantAlias': tenantAlias
+    };
+    RestUtil.RestRequest(restCtx, '/api/ui/skin/logo', 'POST', params, callback);
+};