001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.csp;
018
019import java.util.List;
020import java.util.stream.Collectors;
021
022import org.apache.wicket.request.cycle.RequestCycle;
023import org.apache.wicket.util.lang.Args;
024
025/**
026 * A CSP value that renders the same value as rendered for the specified directive.
027 * 
028 * @author papegaaij
029 */
030public class ClonedCSPValue implements CSPRenderable
031{
032        private final CSPHeaderConfiguration headerConfiguration;
033
034        private final CSPDirective sourceDirective;
035
036        /**
037         * Creates a new {@code ClonedCSPValue} for the given directive.
038         * 
039         * @param headerConfiguration
040         *            the header to clone from;
041         * @param sourceDirective
042         *            the directive to clone;
043         */
044        public ClonedCSPValue(CSPHeaderConfiguration headerConfiguration, CSPDirective sourceDirective)
045        {
046                this.headerConfiguration = Args.notNull(headerConfiguration, "headerConfiguration");
047                this.sourceDirective = Args.notNull(sourceDirective, "sourceDirective");
048        }
049
050        @Override
051        public String render(ContentSecurityPolicySettings settings, RequestCycle cycle)
052        {
053                List<CSPRenderable> values = headerConfiguration.getDirectives().get(sourceDirective);
054                if (values == null)
055                {
056                        throw new IllegalStateException(
057                                "CSP directive " + sourceDirective + " not set, cannot clone its value.");
058                }
059                return values.stream().map(r -> r.render(settings, cycle)).collect(Collectors.joining(" "));
060        }
061
062        @Override
063        public String toString()
064        {
065                return "clone(" + sourceDirective.getValue() + ")";
066        }
067}