private void handleErrorMessage(ErrorMessage errorMessage) throws OtrException {
logger.finest(
getSessionID().getAccountID()
+ " received an error message from "
+ getSessionID().getUserID()
+ " throught "
+ getSessionID().getUserID()
+ ".");
OtrPolicy policy = getSessionPolicy();
// Re-negotiate if we got an error and we are encrypted
if (policy.getErrorStartAKE() && getSessionStatus() == SessionStatus.ENCRYPTED) {
showWarning(errorMessage.error + " Initiating encryption.");
logger.finest("Error message starts AKE.");
doTransmitLastMessage = true;
isLastMessageRetransmit = true;
Vector<Integer> versions = new Vector<Integer>();
if (policy.getAllowV1()) versions.add(1);
if (policy.getAllowV2()) versions.add(2);
logger.finest("Sending Query");
injectMessage(new QueryMessage(versions));
} else {
showError(errorMessage.error);
}
}
/*
* (non-Javadoc)
*
* @see
* net.java.otr4j.session.ISession#handleReceivingMessage(java.lang.String)
*/
public synchronized String transformReceiving(String msgText, List<TLV> tlvs)
throws OtrException {
OtrPolicy policy = getSessionPolicy();
if (!policy.getAllowV1() && !policy.getAllowV2()) {
logger.finest("Policy does not allow neither V1 not V2, ignoring message.");
return msgText;
}
AbstractMessage m;
try {
m = SerializationUtils.toMessage(msgText);
} catch (IOException e) {
throw new OtrException(e);
}
if (m == null) return msgText; // Propably null or empty.
switch (m.messageType) {
case AbstractEncodedMessage.MESSAGE_DATA:
return handleDataMessage((DataMessage) m, tlvs);
case AbstractMessage.MESSAGE_ERROR:
handleErrorMessage((ErrorMessage) m);
return null;
case AbstractMessage.MESSAGE_PLAINTEXT:
return handlePlainTextMessage((PlainTextMessage) m);
case AbstractMessage.MESSAGE_QUERY:
handleQueryMessage((QueryMessage) m);
return null;
case AbstractEncodedMessage.MESSAGE_DH_COMMIT:
case AbstractEncodedMessage.MESSAGE_DHKEY:
case AbstractEncodedMessage.MESSAGE_REVEALSIG:
case AbstractEncodedMessage.MESSAGE_SIGNATURE:
AuthContext auth = this.getAuthContext();
auth.handleReceivingMessage(m);
if (auth.getIsSecure()) {
this.setSessionStatus(SessionStatus.ENCRYPTED);
logger.finest("Gone Secure.");
}
return null;
default:
throw new UnsupportedOperationException("Received an uknown message type.");
}
}
private void handleQueryMessage(QueryMessage queryMessage) throws OtrException {
logger.finest(
getSessionID().getAccountID()
+ " received a query message from "
+ getSessionID().getUserID()
+ " throught "
+ getSessionID().getProtocolName()
+ ".");
setSessionStatus(SessionStatus.PLAINTEXT);
OtrPolicy policy = getSessionPolicy();
if (queryMessage.versions.contains(2) && policy.getAllowV2()) {
logger.finest("Query message with V2 support found.");
getAuthContext().respondV2Auth();
} else if (queryMessage.versions.contains(1) && policy.getAllowV1()) {
throw new UnsupportedOperationException();
}
}
private String handlePlainTextMessage(PlainTextMessage plainTextMessage) throws OtrException {
logger.finest(
getSessionID().getAccountID()
+ " received a plaintext message from "
+ getSessionID().getUserID()
+ " throught "
+ getSessionID().getProtocolName()
+ ".");
OtrPolicy policy = getSessionPolicy();
List<Integer> versions = plainTextMessage.versions;
if (versions == null || versions.size() < 1) {
logger.finest("Received plaintext message without the whitespace tag.");
switch (this.getSessionStatus()) {
case ENCRYPTED:
case FINISHED:
// Display the message to the user, but warn him that the
// message was received unencrypted.
showError("The message was received unencrypted.");
return plainTextMessage.cleanText;
case PLAINTEXT:
// Simply display the message to the user. If
// REQUIRE_ENCRYPTION
// is set, warn him that the message was received
// unencrypted.
if (policy.getRequireEncryption()) {
showError("The message was received unencrypted.");
}
return plainTextMessage.cleanText;
}
} else {
logger.finest("Received plaintext message with the whitespace tag.");
switch (this.getSessionStatus()) {
case ENCRYPTED:
case FINISHED:
// Remove the whitespace tag and display the message to the
// user, but warn him that the message was received
// unencrypted.
showError("The message was received unencrypted.");
case PLAINTEXT:
// Remove the whitespace tag and display the message to the
// user. If REQUIRE_ENCRYPTION is set, warn him that the
// message
// was received unencrypted.
if (policy.getRequireEncryption()) showError("The message was received unencrypted.");
}
if (policy.getWhitespaceStartAKE()) {
logger.finest("WHITESPACE_START_AKE is set");
if (plainTextMessage.versions.contains(2) && policy.getAllowV2()) {
logger.finest("V2 tag found.");
getAuthContext().respondV2Auth();
} else if (plainTextMessage.versions.contains(1) && policy.getAllowV1()) {
throw new UnsupportedOperationException();
}
}
}
return plainTextMessage.cleanText;
}
/**
* Sets the button enabled status according to the passed in {@link OtrPolicy}.
*
* @param contactPolicy the {@link OtrPolicy}.
*/
private void setPolicy(OtrPolicy contactPolicy) {
getButton().setEnabled(contactPolicy != null && contactPolicy.getEnableManual());
}