001// Copyright 2008, 2012, 2014 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.validator;
016
017import org.apache.tapestry5.Field;
018import org.apache.tapestry5.MarkupWriter;
019import org.apache.tapestry5.ValidationException;
020import org.apache.tapestry5.ioc.MessageFormatter;
021import org.apache.tapestry5.services.FormSupport;
022import org.apache.tapestry5.services.Html5Support;
023import org.apache.tapestry5.services.javascript.DataConstants;
024import org.apache.tapestry5.services.javascript.JavaScriptSupport;
025
026import java.util.regex.Pattern;
027
028/**
029 * A validator that checks if a given string is well-formed email address. This validator is not configurable.
030 * <p/>
031 * Starting with release 5.4, this validator also performs client-side validation.
032 */
033public class Email extends AbstractValidator<Void, String>
034{
035    
036    private static final Pattern PATTERN = Pattern
037            .compile("[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?", Pattern.CASE_INSENSITIVE);
038    
039    final private Html5Support html5Support;
040
041    public Email(JavaScriptSupport javaScriptSupport, Html5Support html5Support)
042    {
043        super(null, String.class, "invalid-email", javaScriptSupport);
044        this.html5Support = html5Support;
045    }
046
047    public void render(Field field, Void constraintValue, MessageFormatter formatter, MarkupWriter writer,
048                       FormSupport formSupport)
049    {
050        if (formSupport.isClientValidationEnabled())
051        {
052            javaScriptSupport.require("t5/core/validation");
053
054            writer.attributes(
055                    DataConstants.VALIDATION_ATTRIBUTE, true,
056                    "data-validate-regexp", PATTERN.pattern(),
057                    "data-regexp-message", formatter.toString());
058        }
059        
060        if (html5Support.isHtml5SupportEnabled()) {
061            writer.getElement().forceAttributes("type", "email");
062        }
063        
064    }
065
066    public void validate(Field field, Void constraintValue, MessageFormatter formatter, String value)
067            throws ValidationException
068    {
069        if (!PATTERN.matcher(value).matches()) throw new ValidationException(formatter.toString());
070    }
071}