Added ability to add a validation function to a Cloud Code function

Author: codegefluester

functions.js

@@ -10,6 +10,14 @@ var router = new PromiseRouter();
 function handleCloudFunction(req) {
   // TODO: set user from req.auth
   if (Parse.Cloud.Functions[req.params.functionName]) {
+    // Run the validator for this function first
+    if (Parse.Cloud.Validators[req.params.functionName]) {
+      var result = Parse.Cloud.Validators[req.params.functionName](req.body);
+      if (!result) {
+        throw new Parse.Error(Parse.Error.SCRIPT_FAILED, 'Validation failed.');
+      }
+    }
+
     return new Promise(function (resolve, reject) {
       var response = createResponseObject(resolve, reject);
       var request = {

index.js

@@ -113,14 +113,17 @@ function ParseServer(args) {
 
 function addParseCloud() {
   Parse.Cloud.Functions = {};
+  Parse.Cloud.Validators = {};
   Parse.Cloud.Triggers = {
     beforeSave: {},
     beforeDelete: {},
     afterSave: {},
     afterDelete: {}
   };
-  Parse.Cloud.define = function(functionName, handler) {
+  
+  Parse.Cloud.define = function(functionName, handler, validationHandler) {
     Parse.Cloud.Functions[functionName] = handler;
+    Parse.Cloud.Validators[functionName] = validationHandler;
   };
   Parse.Cloud.beforeSave = function(parseClass, handler) {
     var className = getClassName(parseClass);