    001// Licensed under the Apache License, Version 2.0 (the "License");
    002// you may not use this file except in compliance with the License.
    003// You may obtain a copy of the License at
    004//
    005//     http://www.apache.org/licenses/LICENSE-2.0
    006//
    007// Unless required by applicable law or agreed to in writing, software
    008// distributed under the License is distributed on an "AS IS" BASIS,
    009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    010// See the License for the specific language governing permissions and
    011// limitations under the License.
    012
    013package org.apache.tapestry5.validator;
    014
    015import org.apache.tapestry5.Field;
    016import org.apache.tapestry5.MarkupWriter;
    017import org.apache.tapestry5.ValidationException;
    018import org.apache.tapestry5.ioc.MessageFormatter;
    019import org.apache.tapestry5.services.FormSupport;
    020import org.apache.tapestry5.services.Html5Support;
    021import org.apache.tapestry5.services.javascript.DataConstants;
    022import org.apache.tapestry5.services.javascript.JavaScriptSupport;
    023
    024import java.util.regex.Pattern;
    025
    026/**
    027 * A validator that checks if a given string is well-formed email address. This validator is not configurable.
    028 *
    029 * Starting with release 5.4, this validator also performs client-side validation.
    030 */
    031public class Email extends AbstractValidator<Void, String>
    032{
    033
    034    // The client-side uses a similar RE, but converts the input to lower case before applying the pattern.
    035    // See validation.coffee.
    036
    037    private static final Pattern PATTERN = Pattern
    038            .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);
    039
    040    final private Html5Support html5Support;
    041
    042    public Email(JavaScriptSupport javaScriptSupport, Html5Support html5Support)
    043    {
    044        super(null, String.class, "invalid-email", javaScriptSupport);
    045        this.html5Support = html5Support;
    046    }
    047
    048    public void render(Field field, Void constraintValue, MessageFormatter formatter, MarkupWriter writer,
    049                       FormSupport formSupport)
    050    {
    051        if (formSupport.isClientValidationEnabled())
    052        {
    053            javaScriptSupport.require("t5/core/validation");
    054
    055            writer.attributes(
    056                    DataConstants.VALIDATION_ATTRIBUTE, true,
    057                    "data-validate-email", true,
    058                    "data-email-message", formatter.toString());
    059        }
    060
    061        if (html5Support.isHtml5SupportEnabled()) {
    062            writer.getElement().forceAttributes("type", "email");
    063        }
    064
    065    }
    066
    067    public void validate(Field field, Void constraintValue, MessageFormatter formatter, String value)
    068            throws ValidationException
    069    {
    070        if (!PATTERN.matcher(value).matches()) throw new ValidationException(formatter.toString());
    071    }
    072}