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/*
* Copyright (C) 2012 Dominik Schürmann <dominik@dominikschuermann.de>
*
* 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.thialfihar.android.apg.ui.dialog;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPPrivateKey;
import org.spongycastle.openpgp.PGPSecretKey;
import org.spongycastle.openpgp.operator.PBESecretKeyDecryptor;
import org.spongycastle.openpgp.operator.jcajce.JcePBESecretKeyDecryptorBuilder;
import org.thialfihar.android.apg.Apg;
import org.thialfihar.android.apg.Apg.GeneralException;
import org.thialfihar.android.apg.Constants;
import org.thialfihar.android.apg.Id;
import org.thialfihar.android.apg.R;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.support.v4.app.DialogFragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class FileDialogFragment extends DialogFragment {
private Messenger mMessenger;
private static final String ARG_MESSENGER = "messenger";
private static final String ARG_SECRET_KEY_ID = "secret_key_id";
public static final int MESSAGE_OKAY = 1;
/**
* Instantiates new instance of this dialog fragment
*
*/
public static FileDialogFragment newInstance(long secretKeyId, Messenger messenger){
FileDialogFragment frag = new FileDialogFragment();
Bundle args = new Bundle();
args.putLong(ARG_SECRET_KEY_ID, secretKeyId);
args.putParcelable(ARG_MESSENGER, messenger);
frag.setArguments(args);
return frag;
}
/**
* Checks if key has a passphrase
*
* @param secretKeyId
* @return true if it has a passphrase
*/
private static boolean hasPassphrase(long secretKeyId) {
// check if the key has no passphrase
try {
PGPSecretKey secretKey = Apg.getMasterKey(Apg.getSecretKeyRing(secretKeyId));
Log.d(Constants.TAG, "Check if key has no passphrase...");
PBESecretKeyDecryptor keyDecryptor = new JcePBESecretKeyDecryptorBuilder().setProvider(
"SC").build("".toCharArray());
PGPPrivateKey testKey = secretKey.extractPrivateKey(keyDecryptor);
if (testKey != null) {
Log.d(Constants.TAG, "Key has no passphrase! Caches empty passphrase!");
// cache empty passphrase
Apg.setCachedPassPhrase(secretKey.getKeyID(), "");
return false;
}
} catch (PGPException e) {
// silently catch
}
return true;
}
/**
* Creates dialog
*/
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Activity activity = getActivity();
long secretKeyId = getArguments().getLong(ARG_SECRET_KEY_ID);
mMessenger = getArguments().getParcelable(ARG_MESSENGER);
AlertDialog.Builder alert = new AlertDialog.Builder(activity);
alert.setTitle(R.string.title_authentication);
final PGPSecretKey secretKey;
if (secretKeyId == Id.key.symmetric || secretKeyId == Id.key.none) {
secretKey = null;
alert.setMessage(getString(R.string.passPhraseForSymmetricEncryption));
} else {
secretKey = Apg.getMasterKey(Apg.getSecretKeyRing(secretKeyId));
if (secretKey == null) {
alert.setTitle(R.string.title_keyNotFound);
alert.setMessage(getString(R.string.keyNotFound, secretKeyId));
alert.setPositiveButton(android.R.string.ok, new OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dismiss();
}
});
alert.setCancelable(false);
return alert.create();
}
String userId = Apg.getMainUserIdSafe(activity, secretKey);
alert.setMessage(getString(R.string.passPhraseFor, userId));
}
LayoutInflater inflater = activity.getLayoutInflater();
View view = inflater.inflate(R.layout.passphrase, null);
final EditText input = (EditText) view.findViewById(R.id.passphrase_passphrase);
final TextView labelNotUsed = (TextView) view
.findViewById(R.id.passphrase_label_passphrase_again);
labelNotUsed.setVisibility(View.GONE);
final EditText inputNotUsed = (EditText) view
.findViewById(R.id.passphrase_passphrase_again);
inputNotUsed.setVisibility(View.GONE);
alert.setView(view);
alert.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dismiss();
String passPhrase = input.getText().toString();
long keyId;
if (secretKey != null) {
try {
PBESecretKeyDecryptor keyDecryptor = new JcePBESecretKeyDecryptorBuilder()
.setProvider("SC").build(passPhrase.toCharArray());
PGPPrivateKey testKey = secretKey.extractPrivateKey(keyDecryptor);
if (testKey == null) {
Toast.makeText(activity, R.string.error_couldNotExtractPrivateKey,
Toast.LENGTH_SHORT).show();
return;
}
} catch (PGPException e) {
Toast.makeText(activity, R.string.wrongPassPhrase, Toast.LENGTH_SHORT)
.show();
return;
}
keyId = secretKey.getKeyID();
} else {
keyId = Id.key.symmetric;
}
// cache the new passphrase
Log.d(Constants.TAG, "Everything okay! Caching entered passphrase");
Apg.setCachedPassPhrase(keyId, passPhrase);
sendMessageToHandler(MESSAGE_OKAY);
}
});
alert.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dismiss();
}
});
return alert.create();
}
/**
* Send message back to handler which is initialized in a activity
*
* @param what
* Message integer you want to send
*/
private void sendMessageToHandler(Integer what) {
Message msg = Message.obtain();
msg.what = what;
try {
mMessenger.send(msg);
} catch (RemoteException e) {
Log.w(Constants.TAG, "Exception sending message, Is handler present?", e);
} catch (NullPointerException e) {
Log.w(Constants.TAG, "Messenger is null!", e);
}
}
}
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