001/*
002 *
003 * Copyright 2020 Paul Schaub
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.jivesoftware.smackx.stanza_content_encryption.provider;
018
019import java.io.IOException;
020import java.text.ParseException;
021import java.util.Date;
022
023import org.jivesoftware.smack.packet.XmlElement;
024import org.jivesoftware.smack.packet.XmlEnvironment;
025import org.jivesoftware.smack.parsing.SmackParsingException;
026import org.jivesoftware.smack.provider.ExtensionElementProvider;
027import org.jivesoftware.smack.util.PacketParserUtils;
028import org.jivesoftware.smack.util.ParserUtils;
029import org.jivesoftware.smack.xml.XmlPullParser;
030import org.jivesoftware.smack.xml.XmlPullParserException;
031
032import org.jivesoftware.smackx.stanza_content_encryption.element.AffixElement;
033import org.jivesoftware.smackx.stanza_content_encryption.element.ContentElement;
034import org.jivesoftware.smackx.stanza_content_encryption.element.FromAffixElement;
035import org.jivesoftware.smackx.stanza_content_encryption.element.PayloadElement;
036import org.jivesoftware.smackx.stanza_content_encryption.element.RandomPaddingAffixElement;
037import org.jivesoftware.smackx.stanza_content_encryption.element.TimestampAffixElement;
038import org.jivesoftware.smackx.stanza_content_encryption.element.ToAffixElement;
039
040import org.jxmpp.JxmppContext;
041import org.jxmpp.jid.impl.JidCreate;
042import org.jxmpp.stringprep.XmppStringprepException;
043
044public class ContentElementProvider extends ExtensionElementProvider<ContentElement> {
045
046    @Override
047    public ContentElement parse(XmlPullParser parser, int initialDepth, XmlEnvironment xmlEnvironment, JxmppContext jxmppContext)
048            throws XmlPullParserException, IOException, ParseException, SmackParsingException {
049        ContentElement.Builder builder = ContentElement.builder();
050
051        while (true) {
052            XmlPullParser.Event tag = parser.next();
053            if (tag == XmlPullParser.Event.START_ELEMENT) {
054                String name = parser.getName();
055                switch (name) {
056                    case ToAffixElement.ELEMENT:
057                        parseToAffix(parser, builder);
058                        break;
059
060                    case FromAffixElement.ELEMENT:
061                        parseFromAffix(parser, builder);
062                        break;
063
064                    case TimestampAffixElement.ELEMENT:
065                        parseTimestampAffix(parser, builder);
066                        break;
067
068                    case RandomPaddingAffixElement.ELEMENT:
069                        parseRPadAffix(parser, builder);
070                        break;
071
072                    case PayloadElement.ELEMENT:
073                        parsePayload(parser, xmlEnvironment, jxmppContext, builder);
074                        break;
075
076                    default:
077                        parseCustomAffix(parser, xmlEnvironment, jxmppContext, builder);
078                        break;
079                }
080            } else if (tag == XmlPullParser.Event.END_ELEMENT) {
081                if (parser.getDepth() == initialDepth) {
082                    break;
083                }
084            }
085        }
086        return builder.build();
087    }
088
089    private static void parseCustomAffix(XmlPullParser parser, XmlEnvironment outerXmlEnvironment, JxmppContext jxmppContext, ContentElement.Builder builder)
090            throws XmlPullParserException, IOException, SmackParsingException {
091        String name = parser.getName();
092        String namespace = parser.getNamespace();
093
094        AffixElement element = (AffixElement) PacketParserUtils.parseExtensionElement(name, namespace, parser, outerXmlEnvironment, jxmppContext);
095        builder.addFurtherAffixElement(element);
096    }
097
098    private static void parsePayload(XmlPullParser parser, XmlEnvironment outerXmlEnvironment, JxmppContext jxmppContext, ContentElement.Builder builder)
099            throws IOException, XmlPullParserException, SmackParsingException {
100        final int initialDepth = parser.getDepth();
101        while (true) {
102            XmlPullParser.Event tag = parser.next();
103
104            if (tag == XmlPullParser.Event.START_ELEMENT) {
105                String name = parser.getName();
106                String namespace = parser.getNamespace();
107                XmlElement element = PacketParserUtils.parseExtensionElement(name, namespace, parser, outerXmlEnvironment, jxmppContext);
108                builder.addPayloadItem(element);
109            }
110
111            if (tag == XmlPullParser.Event.END_ELEMENT && parser.getDepth() == initialDepth) {
112                return;
113            }
114        }
115    }
116
117    private static void parseRPadAffix(XmlPullParser parser, ContentElement.Builder builder)
118            throws IOException, XmlPullParserException {
119        builder.setRandomPadding(parser.nextText());
120    }
121
122    private static void parseTimestampAffix(XmlPullParser parser, ContentElement.Builder builder)
123            throws ParseException {
124        Date timestamp = ParserUtils.getDateFromXep82String(
125                parser.getAttributeValue("", TimestampAffixElement.ATTR_STAMP));
126        builder.setTimestamp(timestamp);
127    }
128
129    private static void parseFromAffix(XmlPullParser parser, ContentElement.Builder builder)
130            throws XmppStringprepException {
131        String jidString = parser.getAttributeValue("", FromAffixElement.ATTR_JID);
132        builder.setFrom(JidCreate.from(jidString));
133    }
134
135    private static void parseToAffix(XmlPullParser parser, ContentElement.Builder builder)
136            throws XmppStringprepException {
137        String jidString = parser.getAttributeValue("", ToAffixElement.ATTR_JID);
138        builder.addTo(JidCreate.from(jidString));
139    }
140}