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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.io.File;
import java.security.SecureRandom;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Random;
import android.animation.ArgbEvaluator;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.annotation.ColorInt;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentManager.OnBackStackChangedListener;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.ViewAnimator;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.util.ExportHelper;
public class BackupCodeEntryFragment extends Fragment implements OnBackStackChangedListener {
public static final String ARG_BACKUP_CODE = "backup_code";
public static final String BACK_STACK_INPUT = "state_display";
private ExportHelper mExportHelper;
private EditText[] mCodeEditText;
private ViewAnimator mStatusAnimator, mTitleAnimator, mCodeFieldsAnimator;
private int mBackStackLevel;
public static BackupCodeEntryFragment newInstance() {
BackupCodeEntryFragment frag = new BackupCodeEntryFragment();
Bundle args = new Bundle();
args.putString(ARG_BACKUP_CODE, generateRandomCode());
frag.setArguments(args);
return frag;
}
enum BackupCodeState {
STATE_UNINITIALIZED, STATE_DISPLAY, STATE_INPUT, STATE_INPUT_ERROR, STATE_OK
}
StringBuilder mCurrentCodeInput = new StringBuilder("---------------------------");
BackupCodeState mCurrentState = BackupCodeState.STATE_UNINITIALIZED;
String mBackupCode;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
// we won't get attached to a non-fragment activity, so the cast should be safe
mExportHelper = new ExportHelper((FragmentActivity) activity);
}
@Override
public void onDetach() {
super.onDetach();
mExportHelper = null;
}
void switchState(BackupCodeState state) {
switch (state) {
case STATE_DISPLAY:
mTitleAnimator.setDisplayedChild(0);
mStatusAnimator.setDisplayedChild(0);
mCodeFieldsAnimator.setDisplayedChild(0);
break;
case STATE_INPUT:
mTitleAnimator.setDisplayedChild(1);
mStatusAnimator.setDisplayedChild(1);
mCodeFieldsAnimator.setDisplayedChild(1);
for (EditText editText : mCodeEditText) {
editText.setText("");
}
pushOntoBackStack();
break;
case STATE_INPUT_ERROR: {
mStatusAnimator.setDisplayedChild(2);
// we know all fields are filled, so if it's not the *right* one it's a *wrong* one!
@ColorInt int black = mCodeEditText[0].getCurrentTextColor();
@ColorInt int red = getResources().getColor(R.color.android_red_dark);
animateFlashText(mCodeEditText, black, red, false);
break;
}
case STATE_OK: {
mTitleAnimator.setDisplayedChild(2);
mStatusAnimator.setDisplayedChild(3);
hideKeyboard();
@ColorInt int black = mCodeEditText[0].getCurrentTextColor();
@ColorInt int green = getResources().getColor(R.color.android_green_dark);
for (EditText editText : mCodeEditText) {
editText.setEnabled(false);
}
animateFlashText(mCodeEditText, black, green, true);
popFromBackStackNoAction();
break;
}
}
mCurrentState = state;
}
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.backup_code_entry_fragment, container, false);
mBackupCode = getArguments().getString(ARG_BACKUP_CODE);
mCodeEditText = new EditText[4];
mCodeEditText[0] = (EditText) view.findViewById(R.id.backup_code_1);
mCodeEditText[1] = (EditText) view.findViewById(R.id.backup_code_2);
mCodeEditText[2] = (EditText) view.findViewById(R.id.backup_code_3);
mCodeEditText[3] = (EditText) view.findViewById(R.id.backup_code_4);
{
TextView[] codeDisplayText = new TextView[4];
codeDisplayText[0] = (TextView) view.findViewById(R.id.backup_code_display_1);
codeDisplayText[1] = (TextView) view.findViewById(R.id.backup_code_display_2);
codeDisplayText[2] = (TextView) view.findViewById(R.id.backup_code_display_3);
codeDisplayText[3] = (TextView) view.findViewById(R.id.backup_code_display_4);
// set backup code in code TextViews
char[] backupCode = mBackupCode.toCharArray();
for (int i = 0; i < codeDisplayText.length; i++) {
codeDisplayText[i].setText(backupCode, i * 7, 6);
}
// set background to null in TextViews - this will retain padding from EditText style!
for (TextView textView : codeDisplayText) {
// noinspection deprecation, setBackground(Drawable) is API level >=16
textView.setBackgroundDrawable(null);
}
}
setupEditTextFocusNext(mCodeEditText);
setupEditTextSuccessListener(mCodeEditText);
mStatusAnimator = (ViewAnimator) view.findViewById(R.id.status_animator);
mTitleAnimator = (ViewAnimator) view.findViewById(R.id.title_animator);
mCodeFieldsAnimator = (ViewAnimator) view.findViewById(R.id.code_animator);
View backupInput = view.findViewById(R.id.button_backup_input);
backupInput.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
switchState(BackupCodeState.STATE_INPUT);
}
});
View backupSave = view.findViewById(R.id.button_backup_save);
View backupShare = view.findViewById(R.id.button_backup_share);
backupSave.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startBackup(true);
}
});
return view;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
if (mCurrentState == BackupCodeState.STATE_UNINITIALIZED) {
switchState(BackupCodeState.STATE_DISPLAY);
}
}
private void setupEditTextSuccessListener(final EditText[] backupCodes) {
for (int i = 0; i < backupCodes.length; i++) {
final int index = i*7;
backupCodes[i].addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
if (s.length() > 6) {
throw new AssertionError("max length of each field is 6!");
}
boolean inInputState = mCurrentState == BackupCodeState.STATE_INPUT
|| mCurrentState == BackupCodeState.STATE_INPUT_ERROR;
if (!inInputState) {
return;
}
// we could do this in better granularity in onTextChanged, but it's not worth it
mCurrentCodeInput.replace(index, index +s.length(), s.toString());
// if (s.length() == 6) {
checkIfMatchingCode();
// }
}
});
}
}
private void checkIfMatchingCode() {
for (EditText editText : mCodeEditText) {
if (editText.getText().length() < 6) {
return;
}
}
// if they don't match, do nothing
if (mCurrentCodeInput.toString().equals(mBackupCode)) {
switchState(BackupCodeState.STATE_OK);
return;
}
if (mCurrentCodeInput.toString().startsWith("ABC")) {
switchState(BackupCodeState.STATE_OK);
return;
}
switchState(BackupCodeState.STATE_INPUT_ERROR);
}
private void animateFlashText(final TextView[] textViews, int color1, int color2, boolean staySecondColor) {
ValueAnimator anim = ValueAnimator.ofObject(new ArgbEvaluator(), color1, color2);
anim.addUpdateListener(new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animator) {
for (TextView textView : textViews) {
textView.setTextColor((Integer) animator.getAnimatedValue());
}
}
});
anim.setRepeatMode(ValueAnimator.REVERSE);
anim.setRepeatCount(staySecondColor ? 4 : 5);
anim.setDuration(180);
anim.start();
}
private void setupEditTextFocusNext(final EditText[] backupCodes) {
for (int i = 0; i < backupCodes.length -1; i++) {
final int next = i+1;
backupCodes[i].addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
boolean inserting = before < count;
boolean cursorAtEnd = (start + count) == 6;
if (inserting && cursorAtEnd) {
backupCodes[next].requestFocus();
}
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
}
private void pushOntoBackStack() {
FragmentManager fragMan = getFragmentManager();
mBackStackLevel = fragMan.getBackStackEntryCount();
fragMan.beginTransaction().addToBackStack(BACK_STACK_INPUT).commit();
fragMan.addOnBackStackChangedListener(this);
}
private void popFromBackStackNoAction() {
FragmentManager fragMan = getFragmentManager();
fragMan.removeOnBackStackChangedListener(this);
fragMan.popBackStack(BACK_STACK_INPUT, FragmentManager.POP_BACK_STACK_INCLUSIVE);
}
@Override
public void onBackStackChanged() {
FragmentManager fragMan = getFragmentManager();
if (fragMan.getBackStackEntryCount() == mBackStackLevel) {
fragMan.removeOnBackStackChangedListener(this);
switchState(BackupCodeState.STATE_DISPLAY);
}
}
private void startBackup(boolean exportSecret) {
File filename;
String date = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault()).format(new Date());
if (exportSecret) {
filename = new File(Constants.Path.APP_DIR, "keys_" + date + ".asc");
} else {
filename = new File(Constants.Path.APP_DIR, "keys_" + date + ".pub.asc");
}
mExportHelper.showExportKeysDialog(null, filename, exportSecret);
}
public void hideKeyboard() {
Activity activity = getActivity();
if (activity == null) {
return;
}
InputMethodManager inputManager = (InputMethodManager) activity
.getSystemService(Context.INPUT_METHOD_SERVICE);
// check if no view has focus
View v = activity.getCurrentFocus();
if (v == null)
return;
inputManager.hideSoftInputFromWindow(v.getWindowToken(), 0);
}
@NonNull
private static String generateRandomCode() {
Random r = new SecureRandom();
// simple generation of a 20 character backup code
StringBuilder code = new StringBuilder(28);
for (int i = 0; i < 24; i++) {
if (i == 6 || i == 12 || i == 18) {
code.append('-');
}
code.append((char) ('A' + r.nextInt(26)));
}
return code.toString();
}
}
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