168 lines
8.0 KiB
Java
168 lines
8.0 KiB
Java
/**
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*
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* Copyright 2018 Paul Schaub.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smackx.ox;
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import java.io.IOException;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Set;
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import java.util.WeakHashMap;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import org.jivesoftware.smack.Manager;
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import org.jivesoftware.smack.SmackException;
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import org.jivesoftware.smack.XMPPConnection;
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import org.jivesoftware.smack.XMPPException;
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import org.jivesoftware.smack.chat2.Chat;
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import org.jivesoftware.smack.chat2.ChatManager;
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import org.jivesoftware.smack.chat2.IncomingChatMessageListener;
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import org.jivesoftware.smack.packet.Message;
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import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
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import org.jivesoftware.smackx.ox.element.OpenPgpContentElement;
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import org.jivesoftware.smackx.ox.element.OpenPgpElement;
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import org.jivesoftware.smackx.ox.element.SigncryptElement;
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import org.jivesoftware.smackx.ox.exception.MissingOpenPgpKeyPairException;
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import org.jivesoftware.smackx.ox.exception.MissingOpenPgpPublicKeyException;
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import org.jivesoftware.smackx.ox.exception.SmackOpenPgpException;
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import org.jivesoftware.smackx.ox.listener.OpenPgpEncryptedMessageListener;
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import org.jxmpp.jid.BareJid;
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import org.jxmpp.jid.EntityBareJid;
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import org.xmlpull.v1.XmlPullParserException;
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/**
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* Entry point of Smacks API for XEP-0374: OpenPGP for XMPP: Instant Messaging.
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*
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* @see <a href="https://xmpp.org/extensions/xep-0374.html">
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* XEP-0374: OpenPGP for XMPP: Instant Messaging</a>
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*/
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public final class OXInstantMessagingManager extends Manager {
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public static final String NAMESPACE_0 = "urn:xmpp:openpgp:im:0";
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private static final Logger LOGGER = Logger.getLogger(OXInstantMessagingManager.class.getName());
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private static final Map<XMPPConnection, OXInstantMessagingManager> INSTANCES = new WeakHashMap<>();
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private final OpenPgpManager openPgpManager;
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private final ChatManager chatManager;
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private final Set<OpenPgpEncryptedMessageListener> chatMessageListeners = new HashSet<>();
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private OXInstantMessagingManager(final XMPPConnection connection) {
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super(connection);
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this.openPgpManager = OpenPgpManager.getInstanceFor(connection);
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this.chatManager = ChatManager.getInstanceFor(connection);
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chatManager.addIncomingListener(incomingChatMessageListener);
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}
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public static OXInstantMessagingManager getInstanceFor(XMPPConnection connection) {
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OXInstantMessagingManager manager = INSTANCES.get(connection);
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if (manager == null) {
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manager = new OXInstantMessagingManager(connection);
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INSTANCES.put(connection, manager);
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}
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return manager;
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}
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/**
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* Determine, whether a contact announces support for XEP-0374: OpenPGP for XMPP: Instant Messaging.
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*
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* @param jid {@link BareJid} of the contact in question.
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* @return true if contact announces support, otherwise false.
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* @throws XMPPException.XMPPErrorException
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* @throws SmackException.NotConnectedException
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* @throws InterruptedException
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* @throws SmackException.NoResponseException
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*/
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public boolean contactSupportsOxInstantMessaging(BareJid jid)
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throws XMPPException.XMPPErrorException, SmackException.NotConnectedException, InterruptedException,
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SmackException.NoResponseException {
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return ServiceDiscoveryManager.getInstanceFor(connection()).supportsFeature(jid, NAMESPACE_0);
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}
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/**
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* Start an encrypted chat with {@code jid}.
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* The chat is encrypted with OpenPGP for XMPP: Instant Messaging (XEP-0374).
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*
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* @see <a href="https://xmpp.org/extensions/xep-0374.html">XEP-0374: OpenPGP for XMPP: Instant Messaging</a>
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* @param jid {@link BareJid} of the contact.
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* @return {@link OpenPgpEncryptedChat} with the contact.
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* @throws SmackOpenPgpException if something happens while gathering fingerprints.
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* @throws InterruptedException
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* @throws XMPPException.XMPPErrorException
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* @throws SmackException.NotConnectedException
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* @throws SmackException.NoResponseException
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*/
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public OpenPgpEncryptedChat chatWith(EntityBareJid jid)
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throws SmackOpenPgpException, InterruptedException, XMPPException.XMPPErrorException,
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SmackException.NotConnectedException, SmackException.NoResponseException {
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OpenPgpFingerprints theirKeys = openPgpManager.determineContactsKeys(jid);
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OpenPgpFingerprints ourKeys = openPgpManager.determineContactsKeys(connection().getUser().asBareJid());
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Chat chat = chatManager.chatWith(jid);
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return new OpenPgpEncryptedChat(openPgpManager.getOpenPgpProvider(), chat, ourKeys, theirKeys);
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}
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public boolean addOpenPgpEncryptedMessageListener(OpenPgpEncryptedMessageListener listener) {
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return chatMessageListeners.add(listener);
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}
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public boolean removeOpenPgpEncryptedMessageListener(OpenPgpEncryptedMessageListener listener) {
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return chatMessageListeners.remove(listener);
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}
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private final IncomingChatMessageListener incomingChatMessageListener =
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new IncomingChatMessageListener() {
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@Override
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public void newIncomingMessage(EntityBareJid from, Message message, Chat chat) {
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OpenPgpElement element = message.getExtension(OpenPgpElement.ELEMENT, OpenPgpElement.NAMESPACE);
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if (element == null) {
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return;
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}
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OpenPgpProvider provider = openPgpManager.getOpenPgpProvider();
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try {
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OpenPgpEncryptedChat encryptedChat = chatWith(from);
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OpenPgpMessage decrypted = provider.decryptAndVerify(element, provider.availableOpenPgpPublicKeysFingerprints(from.asBareJid()));
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OpenPgpContentElement contentElement = decrypted.getOpenPgpContentElement();
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if (decrypted.getState() != OpenPgpMessage.State.signcrypt) {
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LOGGER.log(Level.WARNING, "Decrypted content is not a signcrypt element. Ignore it.");
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return;
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}
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SigncryptElement signcryptElement = (SigncryptElement) contentElement;
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for (OpenPgpEncryptedMessageListener l : chatMessageListeners) {
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l.newIncomingEncryptedMessage(from, message, signcryptElement, encryptedChat);
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}
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} catch (SmackOpenPgpException e) {
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LOGGER.log(Level.WARNING, "Could not start chat with " + from, e);
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} catch (InterruptedException | XMPPException.XMPPErrorException | SmackException.NotConnectedException | SmackException.NoResponseException e) {
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LOGGER.log(Level.WARNING, "Something went wrong.", e);
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} catch (MissingOpenPgpPublicKeyException e) {
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LOGGER.log(Level.WARNING, "Could not verify message " + message.getStanzaId() + ": Missing senders public key " + e.getFingerprint().toString(), e);
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} catch (MissingOpenPgpKeyPairException e) {
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LOGGER.log(Level.WARNING, "Could not decrypt message " + message.getStanzaId() + ": Missing secret key", e);
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} catch (XmlPullParserException | IOException e) {
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LOGGER.log(Level.WARNING, "Could not parse decrypted content element", e);
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}
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}
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};
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}
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