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 */
019package org.apache.wiki.tags;
020
021import org.apache.wiki.api.core.Session;
022import org.apache.wiki.http.filter.CsrfProtectionFilter;
023
024/**
025 * Outputs the hidden {@link CsrfProtectionFilter#ANTICSRF_PARAM}.
026 */
027public class CsrfProtectionTag extends WikiTagBase {
028
029    private boolean meta;
030
031    public void setFormat( final String format ) {
032        meta = "meta".equalsIgnoreCase( format );
033    }
034
035    /**
036     *  {@inheritDoc}
037     */
038    @Override
039    public int doWikiStartTag() throws Exception {
040        final Session session = m_wikiContext.getWikiSession();
041        final String csrfProtectionHidden;
042        if( meta ) {
043            csrfProtectionHidden = "<meta name=\"wikiCsrfProtection\" content='" + session.antiCsrfToken() + "'/>";
044        } else {
045            csrfProtectionHidden = "<input type=\"hidden\" name=\"" + CsrfProtectionFilter.ANTICSRF_PARAM + "\" " +
046                                          "id=\"" + CsrfProtectionFilter.ANTICSRF_PARAM + "\" " +
047                                          "value=\"" + session.antiCsrfToken() + "\"/>";
048        }
049        pageContext.getOut().print( csrfProtectionHidden );
050        return SKIP_BODY;
051    }
052
053}