001/* Copyright (C) 2014 konik.io
002 *
003 * This file is part of the Konik library.
004 *
005 * The Konik library is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Affero General Public License as
007 * published by the Free Software Foundation, either version 3 of the
008 * License, or (at your option) any later version.
009 *
010 * The Konik library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013 * GNU Affero General Public License for more details.
014 *
015 * You should have received a copy of the GNU Affero General Public License
016 * along with the Konik library. If not, see <http://www.gnu.org/licenses/>.
017 */
018package io.konik.validator;
019
020import java.util.regex.Pattern;
021
022import javax.validation.ConstraintValidator;
023import javax.validation.ConstraintValidatorContext;
024
025import io.konik.validator.annotation.Email;
026
027/**
028 *  
029 * The Email Validator for the @Email Annotation
030 */
031public class EmailValidator implements ConstraintValidator<Email, String> {
032   private static final String EMAIL_PATTERN = "[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?";
033
034   private static final Pattern EMAIL_COMPILED_PATTERN = Pattern.compile(EMAIL_PATTERN);
035
036   @Override
037   public void initialize(Email constraintAnnotation) {
038      /* not needed */
039   }
040
041   @Override
042   public boolean isValid(String email, ConstraintValidatorContext context) {
043      if (email == null) {
044         return true;
045      }
046      return EMAIL_COMPILED_PATTERN.matcher(email.toLowerCase()).matches();
047   }
048}