Adding xsrf protection

lib/utils.js

@@ -12,6 +12,26 @@ function isArray(val) {
   return toString.call(val) === '[object Array]';
 }
 
+/**
+ * Determine if a value is a String
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is a String, otherwise false
+ */
+function isString(val) {
+  return typeof val === 'string';
+}
+
+/**
+ * Determine if a value is a Number
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is a Number, otherwise false
+ */
+function isNumber(val) {
+  return typeof val === 'number';
+}
+
 /**
  * Determine if a value is an Object
  *
@@ -49,7 +69,7 @@ function isFile(val) {
  * @returns {boolean} True if value is a Blob, otherwise false
  */
 function isBlob(val) {
-  return toString.call(val) !== '[object Blob]';
+  return toString.call(val) === '[object Blob]';
 }
 
 /**
@@ -133,6 +153,8 @@ function merge(obj1/*, obj2, obj3, ...*/) {
 
 module.exports = {
   isArray: isArray,
+  isString: isString,
+  isNumber: isNumber,
   isObject: isObject,
   isDate: isDate,
   isFile: isFile,