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/*
* Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sufficientlysecure.keychain.ui;
import java.security.SecureRandom;
import java.util.Random;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import org.sufficientlysecure.keychain.R;
public class BackupCodeDisplayFragment extends Fragment {
public static final String ARG_BACKUP_CODE = "backup_code";
private String mBackupCode;
private TextView vBackupCode;
private Button vOkButton;
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.drawer_backup_fragment, container, false);
vBackupCode = (TextView) view.findViewById(R.id.backup_code);
vOkButton = (Button) view.findViewById(R.id.button_ok);
return view;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
if (savedInstanceState == null) {
mBackupCode = generateRandomCode();
} else {
mBackupCode = savedInstanceState.getString(ARG_BACKUP_CODE);
}
vBackupCode.setText(mBackupCode);
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putString(ARG_BACKUP_CODE, mBackupCode);
}
@NonNull
private static String generateRandomCode() {
Random r = new SecureRandom();
// simple generation of a 20 character backup code
StringBuilder code = new StringBuilder(24);
for (int i = 0; i < 20; i++) {
if ((i % 5) == 4) {
code.append('-');
}
code.append('a' + r.nextInt(26));
}
return code.toString();
}
}
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