Lightning FLS. Throw exception if any field is not accessible.

gistfile1.txt

//https://developer.salesforce.com/page/Lightning_Security#Access_Control_in_Apex_Controllers_and_Supporting_Classes
List<String> fields = new List<string>(); // Add your fields to check here
String objectName = ''; //Add your object name here
Map<String,Schema.SObjectField> fieldMap = Schema.getGlobalDescribe().get(objectName).getDescribe().fields.getMap()

for (String fieldToCheck : fields) {
    // Check if the user has access to view field
    if (!fieldMap.get(fieldToCheck).getDescribe().isAccessible()) {
        //also pass error to client
        throw new System.NoAccessException();
     }
}