    001/*
    002    Licensed to the Apache Software Foundation (ASF) under one
    003    or more contributor license agreements.  See the NOTICE file
    004    distributed with this work for additional information
    005    regarding copyright ownership.  The ASF licenses this file
    006    to you under the Apache License, Version 2.0 (the
    007    "License"); you may not use this file except in compliance
    008    with the License.  You may obtain a copy of the License at
    009
    010       http://www.apache.org/licenses/LICENSE-2.0
    011
    012    Unless required by applicable law or agreed to in writing,
    013    software distributed under the License is distributed on an
    014    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015    KIND, either express or implied.  See the License for the
    016    specific language governing permissions and limitations
    017    under the License.
    018 */
    019
    020package org.apache.wiki.tags;
    021
    022
    023import org.apache.wiki.filters.SpamFilter;
    024
    025import javax.servlet.http.HttpServletRequest;
    026import javax.servlet.jsp.PageContext;
    027
    028/**
    029 * Provides hidden input fields which are checked by the {@code SpamFilter}.
    030 *
    031 * @since 2.11.0-M8
    032 */
    033public class SpamFilterInputsTag extends WikiTagBase {
    034
    035    private static final long serialVersionUID = -5224949821664626978L;
    036
    037    /**
    038     * {@inheritDoc}
    039     */
    040    @Override
    041    public int doWikiStartTag() throws Exception {
    042        final String encodingCheckInput = SpamFilter.insertInputFields( pageContext );
    043        final String hashCheckInput =
    044            "<input type='hidden' name='" + SpamFilter.getHashFieldName( ( HttpServletRequest ) pageContext.getRequest() ) + "'" +
    045            " value='" + pageContext.getAttribute( "lastchange", PageContext.REQUEST_SCOPE ) + "' />\n";
    046
    047        // This following field is only for the SpamFilter to catch bots which are just randomly filling all fields and submitting.
    048        // Normal user should never see this field, nor type anything in it.
    049        final String botCheckInput =
    050            "<input class='hidden' type='text' name='" + SpamFilter.getBotFieldName() + "' id='" + SpamFilter.getBotFieldName() + "' value='' />\n";
    051        pageContext.getOut().print( encodingCheckInput + hashCheckInput + botCheckInput );
    052        return SKIP_BODY;
    053    }
    054
    055}