/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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 com.android.settings;
import com.android.internal.widget.LockPatternUtils;
import android.app.admin.DevicePolicyManager;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceCategory;
import android.preference.PreferenceScreen;
public class ChooseLockGeneric extends PreferenceActivity {
private static final int MIN_PASSWORD_LENGTH = 4;
private static final String KEY_UNLOCK_SET_NONE = "unlock_set_none";
private static final String KEY_UNLOCK_SET_PIN = "unlock_set_pin";
private static final String KEY_UNLOCK_SET_PASSWORD = "unlock_set_password";
private static final String KEY_UNLOCK_SET_PATTERN = "unlock_set_pattern";
private static final int CONFIRM_EXISTING_REQUEST = 100;
private static final String PASSWORD_CONFIRMED = "password_confirmed";
private static final String CONFIRM_CREDENTIALS = "confirm_credentials";
private ChooseLockSettingsHelper mChooseLockSettingsHelper;
private DevicePolicyManager mDPM;
private boolean mPasswordConfirmed = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDPM = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
mChooseLockSettingsHelper = new ChooseLockSettingsHelper(this);
if (savedInstanceState != null) {
mPasswordConfirmed = savedInstanceState.getBoolean(PASSWORD_CONFIRMED);
}
if (!mPasswordConfirmed) {
ChooseLockSettingsHelper helper = new ChooseLockSettingsHelper(this);
if (!helper.launchConfirmationActivity(CONFIRM_EXISTING_REQUEST, null, null)) {
mPasswordConfirmed = true; // no password set, so no need to confirm
updatePreferencesOrFinish();
}
} else {
updatePreferencesOrFinish();
}
}
@Override
public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen,
Preference preference) {
final String key = preference.getKey();
boolean handled = true;
if (KEY_UNLOCK_SET_NONE.equals(key)) {
updateUnlockMethodAndFinish(DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED);
} else if (KEY_UNLOCK_SET_PATTERN.equals(key)) {
updateUnlockMethodAndFinish(DevicePolicyManager.PASSWORD_QUALITY_SOMETHING);
} else if (KEY_UNLOCK_SET_PIN.equals(key)) {
updateUnlockMethodAndFinish(DevicePolicyManager.PASSWORD_QUALITY_NUMERIC);
} else if (KEY_UNLOCK_SET_PASSWORD.equals(key)) {
updateUnlockMethodAndFinish(DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC);
} else {
handled = false;
}
return handled;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == CONFIRM_EXISTING_REQUEST && resultCode == RESULT_OK) {
mPasswordConfirmed = true;
updatePreferencesOrFinish();
} else {
setResult(RESULT_CANCELED);
finish();
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
// Saved so we don't force user to re-enter their password if configuration changes
outState.putBoolean(PASSWORD_CONFIRMED, mPasswordConfirmed);
}
private void updatePreferencesOrFinish() {
int quality = getIntent().getIntExtra(LockPatternUtils.PASSWORD_TYPE_KEY, -1);
if (quality == -1) {
// If caller didn't specify password quality, show the UI and allow the user to choose.
quality = mChooseLockSettingsHelper.utils().getKeyguardStoredPasswordQuality();
final PreferenceScreen prefScreen = getPreferenceScreen();
if (prefScreen != null) {
prefScreen.removeAll();
}
addPreferencesFromResource(R.xml.security_settings_picker);
disableUnusablePreferences(mDPM.getPasswordQuality(null));
} else {
updateUnlockMethodAndFinish(quality);
}
}
/***
* Disables preferences that are less secure than required quality.
*
* @param quality the requested quality.
*/
private void disableUnusablePreferences(final int quality) {
final Preference picker = getPreferenceScreen().findPreference("security_picker_category");
final PreferenceCategory cat = (PreferenceCategory) picker;
final int preferenceCount = cat.getPreferenceCount();
for (int i = 0; i < preferenceCount; i++) {
Preference pref = cat.getPreference(i);
if (pref instanceof PreferenceScreen) {
final String key = ((PreferenceScreen) pref).getKey();
boolean enabled = true;
if (KEY_UNLOCK_SET_NONE.equals(key)) {
enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED;
} else if (KEY_UNLOCK_SET_PATTERN.equals(key)) {
enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_SOMETHING;
} else if (KEY_UNLOCK_SET_PIN.equals(key)) {
enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_NUMERIC;
} else if (KEY_UNLOCK_SET_PASSWORD.equals(key)) {
enabled = quality <= DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC;
}
if (!enabled) {
pref.setSummary(R.string.unlock_set_unlock_disabled_summary);
pref.setEnabled(false);
}
}
}
}
/**
* Invokes an activity to change the user's pattern, password or PIN based on given quality
* and minimum quality specified by DevicePolicyManager. If quality is
* {@link DevicePolicyManager#PASSWORD_QUALITY_UNSPECIFIED}, password is cleared.
*
* @param quality the desired quality. Ignored if DevicePolicyManager requires more security.
*/
void updateUnlockMethodAndFinish(int quality) {
// Sanity check. We should never get here without confirming user's existing password first.
if (!mPasswordConfirmed) {
throw new IllegalStateException("Tried to update password without confirming first");
}
// Compare minimum allowed password quality and launch appropriate security setting method
int minQuality = mDPM.getPasswordQuality(null);
if (quality < minQuality) {
quality = minQuality;
}
if (quality >= DevicePolicyManager.PASSWORD_QUALITY_NUMERIC) {
int minLength = mDPM.getPasswordMinimumLength(null);
if (minLength < MIN_PASSWORD_LENGTH) {
minLength = MIN_PASSWORD_LENGTH;
}
final int maxLength = mDPM.getPasswordMaximumLength(quality);
Intent intent = new Intent().setClass(this, ChooseLockPassword.class);
intent.putExtra(LockPatternUtils.PASSWORD_TYPE_KEY, quality);
intent.putExtra(ChooseLockPassword.PASSWORD_MIN_KEY, minLength);
intent.putExtra(ChooseLockPassword.PASSWORD_MAX_KEY, maxLength);
intent.putExtra(CONFIRM_CREDENTIALS, false);
intent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
startActivity(intent);
} else if (quality == DevicePolicyManager.PASSWORD_QUALITY_SOMETHING) {
boolean showTutorial = !mChooseLockSettingsHelper.utils().isPatternEverChosen();
Intent intent = new Intent();
intent.setClass(this, showTutorial
? ChooseLockPatternTutorial.class
: ChooseLockPattern.class);
intent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
intent.putExtra("key_lock_method", "pattern");
intent.putExtra(CONFIRM_CREDENTIALS, false);
startActivity(intent);
} else if (quality == DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED) {
mChooseLockSettingsHelper.utils().clearLock();
setResult(RESULT_OK);
}
finish();
}
}