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/*
* Copyright 2016 OpenMarket Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.matrix.olm;
import android.text.TextUtils;
public class OlmOutboundGroupSession {
private static final String LOG_TAG = "OlmOutboundGroupSession";
/** session raw pointer value returned by JNI.<br>
* this value uniquely identifies the native inbound group session instance.
*/
private long mNativeOlmOutboundGroupSessionId;
/**
* Getter on the native outbound group session ID.
* @return native outbound group session ID
*/
public long getOlmInboundGroupSessionId(){
return mNativeOlmOutboundGroupSessionId;
}
/**
* Constructor.<br>
* Create and save a new session native instance ID and
* initialise a new outbound group session.<br>
* See {@link #initNewSession()} and {@link #initOutboundGroupSession()}
* @throws OlmException
*/
public OlmOutboundGroupSession() throws OlmException {
if(initNewSession()) {
if( 0 != initOutboundGroupSession()) {
releaseSession();// prevent memory leak before throwing
throw new OlmException(OlmException.EXCEPTION_CODE_INIT_OUTBOUND_GROUP_SESSION);
}
} else {
throw new OlmException(OlmException.EXCEPTION_CODE_INIT_NEW_SESSION_FAILURE);
}
}
/**
* Release native session and invalid its JAVA reference counter part.<br>
* Public API for {@link #releaseSessionJni()}.
* To be called before any other API call.
*/
public void releaseSession() {
releaseSessionJni();
mNativeOlmOutboundGroupSessionId = 0;
}
/**
* Destroy the corresponding OLM outbound group session native object.<br>
* This method must ALWAYS be called when this JAVA instance
* is destroyed (ie. garbage collected) to prevent memory leak in native side.
* See {@link #initNewSessionJni()}.
*/
private native void releaseSessionJni();
/**
* Create and save the session native instance ID.
* Wrapper for {@link #initNewSessionJni()}.<br>
* To be called before any other API call.
* @return true if init succeed, false otherwise.
*/
private boolean initNewSession() {
boolean retCode = false;
if(0 != (mNativeOlmOutboundGroupSessionId = initNewSessionJni())){
retCode = true;
}
return retCode;
}
/**
* Create the corresponding OLM outbound group session in native side.<br>
* Do not forget to call {@link #releaseSession()} when JAVA side is done.
* @return native session instance identifier (see {@link #mNativeOlmOutboundGroupSessionId})
*/
private native long initNewSessionJni();
/**
* Start a new outbound group session.<br>
* @return 0 if operation succeed, -1 otherwise
*/
private int initOutboundGroupSession() {
return initOutboundGroupSessionJni();
}
private native int initOutboundGroupSessionJni();
/**
* Get a base64-encoded identifier for this session.
* @return session identifier if operation succeed, null otherwise.
*/
public String sessionIdentifier() {
String retValue = null;
retValue = sessionIdentifierJni();
return retValue;
}
private native String sessionIdentifierJni();
/**
* Get the current message index for this session.<br>
* Each message is sent with an increasing index, this
* method returns the index for the next message.
* @return current session index
*/
public int messageIndex() {
int retValue =0;
retValue = messageIndexJni();
return retValue;
}
private native int messageIndexJni();
/**
* Get the base64-encoded current ratchet key for this session.<br>
* Each message is sent with a different ratchet key. This method returns the
* ratchet key that will be used for the next message.
* @return outbound session key
*/
public String sessionKey() {
String retValue = null;
retValue = sessionKeyJni();
return retValue;
}
private native String sessionKeyJni();
/**
* Encrypt some plain-text message.<br>
* @param aClearMsg message to be encrypted
* @return the encrypted message if operation succeed, null otherwise
*/
public String encryptMessage(String aClearMsg) {
String retValue = null;
if(!TextUtils.isEmpty(aClearMsg)) {
retValue = encryptMessageJni(aClearMsg);
}
return retValue;
}
private native String encryptMessageJni(String aClearMsg);
}
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