Examples with MultiUserChat org.jivesoftware.smackx.muc.MultiUserChat used on opensource projects

Example 26 with MultiUserChat

use of org.jivesoftware.smackx.muc.MultiUserChat in project Smack by igniterealtime.

the class OmemoService method decryptStanza.

/**
 * Decrypt the OmemoElement inside the given Stanza and return it.
 * Return null if something goes wrong.
 *
 * @param stanza stanza
 * @param managerGuard authenticated OmemoManager
 * @return decrypted OmemoMessage or null
 *
 * @throws IOException if an I/O error occurred.
 */
OmemoMessage.Received decryptStanza(Stanza stanza, OmemoManager.LoggedInOmemoManager managerGuard) throws IOException {
    OmemoManager manager = managerGuard.get();
    // Avoid the ratchet being manipulated and the bundle being published multiple times simultaneously
    synchronized (manager) {
        OmemoDevice userDevice = manager.getOwnDevice();
        OmemoElement element = (OmemoElement) stanza.getExtensionElement(OmemoElement.NAME_ENCRYPTED, OmemoElement_VAxolotl.NAMESPACE);
        if (element == null) {
            return null;
        }
        OmemoMessage.Received decrypted = null;
        BareJid sender;
        try {
            MultiUserChat muc = getMuc(manager.getConnection(), stanza.getFrom());
            if (muc != null) {
                Occupant occupant = muc.getOccupant(stanza.getFrom().asEntityFullJidIfPossible());
                Jid occupantJid = occupant.getJid();
                if (occupantJid == null) {
                    LOGGER.log(Level.WARNING, "MUC message received, but there is no way to retrieve the senders Jid. " + stanza.getFrom());
                    return null;
                }
                sender = occupantJid.asBareJid();
                // try is for this
                decrypted = decryptMessage(managerGuard, sender, element);
            } else {
                sender = stanza.getFrom().asBareJid();
                // and this
                decrypted = decryptMessage(managerGuard, sender, element);
            }
            if (decrypted.isPreKeyMessage() && OmemoConfiguration.getCompleteSessionWithEmptyMessage()) {
                LOGGER.log(Level.FINE, "Received a preKeyMessage from " + decrypted.getSenderDevice() + ".\n" + "Complete the session by sending an empty response message.");
                try {
                    sendRatchetUpdate(managerGuard, decrypted.getSenderDevice());
                } catch (CannotEstablishOmemoSessionException e) {
                    throw new AssertionError("Since we successfully received a message, we MUST be able to " + "establish a session. " + e);
                } catch (NoSuchAlgorithmException | InterruptedException | SmackException.NotConnectedException | SmackException.NoResponseException e) {
                    LOGGER.log(Level.WARNING, "Cannot send a ratchet update message.", e);
                }
            }
        } catch (NoRawSessionException e) {
            OmemoDevice device = e.getDeviceWithoutSession();
            LOGGER.log(Level.WARNING, "No raw session found for contact " + device + ". ", e);
        } catch (CorruptedOmemoKeyException | CryptoFailedException e) {
            LOGGER.log(Level.WARNING, "Could not decrypt incoming message: ", e);
        }
        // Upload fresh bundle.
        if (getOmemoStoreBackend().loadOmemoPreKeys(userDevice).size() < OmemoConstants.PRE_KEY_COUNT_PER_BUNDLE) {
            LOGGER.log(Level.FINE, "We used up a preKey. Upload a fresh bundle.");
            try {
                getOmemoStoreBackend().replenishKeys(userDevice);
                OmemoBundleElement bundleElement = getOmemoStoreBackend().packOmemoBundle(userDevice);
                publishBundle(manager.getConnection(), userDevice, bundleElement);
            } catch (CorruptedOmemoKeyException | InterruptedException | SmackException.NoResponseException | SmackException.NotConnectedException | XMPPException.XMPPErrorException | NotALeafNodeException e) {
                LOGGER.log(Level.WARNING, "Could not republish replenished bundle.", e);
            }
        }
        return decrypted;
    }
}