@Nullable
@Override
public View onCreateView(
LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Utils.Log("MessageFragment onCreateView called");
View view = inflater.inflate(R.layout.fragment_messages, container, false);
messageList = (ListView) view.findViewById(R.id.messages_list);
messages = dbManager.getMessages(conversation.getUsername());
adapter =
new MessagesAdapter(
getActivity(),
messages,
dbManager.getUsername(),
conversation.getUsername(),
conversationPass);
messageList.setAdapter(adapter);
messageList.setOnItemLongClickListener(messageLongClicked);
if (savedInstanceState == null) {
messageList.setSelection(adapter.getCount() - 6);
}
sendMessage = (Button) view.findViewById(R.id.btn_message_send);
sendMessage.setOnClickListener(sendClicked);
messageText = (MaterialEditText) view.findViewById(R.id.user_message_text);
return view;
}
@Override
public void onSaveInstanceState(Bundle outState) {
outState.putString("username", conversation.getUsername());
outState.putInt("_id", conversation.getId());
outState.putInt("unreadMessages", conversation.getUnreadMessages());
super.onSaveInstanceState(outState);
}
@Override
public void onClick(View view) {
Utils.Log("Send clicked");
// If the message field is not empty
if (!messageText.getText().toString().isEmpty()) {
final Message message = new Message();
message.setSender(username);
message.setRecipient(conversation.getUsername());
// If DHKE was completed and a key exists
if (!dbManager.getAESKey(conversation.getUsername()).isEmpty()) {
String signature = "";
String key = dbManager.getAESKey(conversation.getUsername());
byte[] iv = Crypto.GenerateRandomIV();
final String plainText = messageText.getText().toString();
final String cipherText = Crypto.AESencrypt(key, plainText, iv);
final String base64IV = Base64.encodeToString(iv, Base64.NO_WRAP);
try {
PrivateKey RSAKeySign =
Crypto.RSAStringToPrivateKey(dbManager.getRSAKeySignaturePrivate());
signature =
Base64.encodeToString(
Crypto.RSASign(Base64.decode(cipherText, Base64.NO_WRAP), RSAKeySign),
Base64.NO_WRAP);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (InvalidKeySpecException e) {
e.printStackTrace();
} catch (NoSuchProviderException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (SignatureException e) {
e.printStackTrace();
}
message.setMessage(cipherText);
message.setIv(base64IV);
message.setSignature(signature);
new HttpHandler() {
@Override
public HttpUriRequest getHttpRequestMethod() {
HttpPost httpPost = new HttpPost(Utils.SERVER_SEND_MESSAGE);
List<NameValuePair> nameValuePairs = new ArrayList<>();
nameValuePairs.add(new BasicNameValuePair("sender", message.getSender()));
nameValuePairs.add(new BasicNameValuePair("recipient", message.getRecipient()));
nameValuePairs.add(new BasicNameValuePair("message", message.getMessage()));
nameValuePairs.add(new BasicNameValuePair("iv", message.getIv()));
nameValuePairs.add(new BasicNameValuePair("signature", message.getSignature()));
try {
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return httpPost;
}
@Override
public void onResponse(String result) {
Utils.Log("HttpResult: " + result);
if (conversation.isEncrypted().equals("true")) {
message.setMessage(
Crypto.AESencrypt(
conversationPass,
plainText,
Base64.decode(message.getIv(), Base64.NO_WRAP)));
message.setEncrypted(true);
dbManager.addMessage(message);
message.setEncrypted(false);
message.setMessage(plainText);
messages.add(message);
adapter.notifyDataSetChanged();
} else {
message.setMessage(plainText);
message.setEncrypted(false);
dbManager.addMessage(message);
messages.add(message);
adapter.notifyDataSetChanged();
}
messageList.setSelection(messages.size() + 1);
}
}.execute();
messageText.setText("");
}
// DHKE was not complete yet, store messages unencrypted temporarily
// and then encrypt and send them once the exchange is complete
else {
message.setEncrypted(false);
message.setMessage(messageText.getText().toString());
message.setIv(Base64.encodeToString(Crypto.GenerateRandomIV(), Base64.NO_WRAP));
dbManager.addMessage(message);
messages.add(message);
adapter.notifyDataSetChanged();
messageList.setSelection(adapter.getCount() - 1);
messageText.setText("");
}
}
}
