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