Permission Check

PermissionCheck

// Permissions.js

canAddFields: function(){
    var returnVal = this.checkPermissions('isNotExternalUser','hasAddFieldsAccess');
    return returnVal;
},
checkPermissions : function() {
    var args = _.toArray(arguments);
    var returnargs =  _(args).every(lang.hitch(this, function(propName) {
      return this[propName].bind(this).call();
    }));
    return returnargs;
},
hasAddFieldsAccess:function(){
    return this.hasAccess(addfieldsAccess);
},
isNotExternalUser:function(){
  // some code to check external user
}

// We will call from Fields.js
Permissions.canAddFields();