001/**
002 *
003 * Copyright © 2014-2023 Florian Schmaus
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * 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.jxmpp.stringprep.libidn;
018
019import org.jxmpp.JxmppContext;
020import org.jxmpp.stringprep.XmppStringprep;
021import org.jxmpp.stringprep.XmppStringprepException;
022
023import gnu.inet.encoding.Stringprep;
024import gnu.inet.encoding.StringprepException;
025
026/**
027 * XMPP string preparation using libidn.
028 */
029public class LibIdnXmppStringprep implements XmppStringprep {
030
031        private static LibIdnXmppStringprep instance;
032
033        /**
034         * The name of the stringprep implementation.
035         */
036        public static final String NAME = "libidn";
037
038        /**
039         * Setup the libidn Stringprep implementation as active Stringprep implementation.
040         */
041        public static void setup() {
042                JxmppContext.setDefaultXmppStringprep(getInstance());
043        }
044
045        /**
046         * Get the libidn Stringprep implementation singleton.
047         * @return the libidn Stringprep implementation.
048         */
049        public static LibIdnXmppStringprep getInstance() {
050                if (instance == null) {
051                        instance = new LibIdnXmppStringprep();
052                }
053                return instance;
054        }
055
056        private LibIdnXmppStringprep() {
057        }
058
059        @Override
060        public String localprep(String string) throws XmppStringprepException {
061                try {
062                        // Allow unassigned codepoints as of RFC6122 A.2
063                        return Stringprep.nodeprep(string, true);
064                } catch (StringprepException e) {
065                        throw new XmppStringprepException(string, e);
066                }
067        }
068
069        @Override
070        public String domainprep(String string) throws XmppStringprepException {
071                try {
072                        // Don't allow unassigned because this is a "stored string". See
073                        // RFC3453 7, RFC3490 4 1) and RFC6122 2.2
074                        return Stringprep.nameprep(string);
075                } catch (StringprepException e) {
076                        throw new XmppStringprepException(string, e);
077                }
078        }
079
080        @Override
081        public String resourceprep(String string) throws XmppStringprepException {
082                try {
083                        // Allow unassigned codepoints as of RFC6122 B.2
084                        return Stringprep.resourceprep(string, true);
085                } catch (StringprepException e) {
086                        throw new XmppStringprepException(string, e);
087                }
088        }
089}