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/*
* Copyright (C) 2014 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.systemui.statusbar.phone;
import android.content.Context;
import com.android.internal.widget.LockPatternUtils;
import com.android.keyguard.KeyguardUpdateMonitor;
import com.android.keyguard.KeyguardUpdateMonitorCallback;
import java.util.ArrayList;
/**
* Caches whether the current unlock method is insecure, taking trust into account. This information
* might be a little bit out of date and should not be used for actual security decisions; it should
* be only used for visual indications.
*/
public class UnlockMethodCache {
private static UnlockMethodCache sInstance;
private final LockPatternUtils mLockPatternUtils;
private final KeyguardUpdateMonitor mKeyguardUpdateMonitor;
private final ArrayList<OnUnlockMethodChangedListener> mListeners = new ArrayList<>();
private boolean mMethodInsecure;
private UnlockMethodCache(Context ctx) {
mLockPatternUtils = new LockPatternUtils(ctx);
mKeyguardUpdateMonitor = KeyguardUpdateMonitor.getInstance(ctx);
KeyguardUpdateMonitor.getInstance(ctx).registerCallback(mCallback);
updateMethodSecure(true /* updateAlways */);
}
public static UnlockMethodCache getInstance(Context context) {
if (sInstance == null) {
sInstance = new UnlockMethodCache(context);
}
return sInstance;
}
/**
* @return whether the current security method is secure, i. e. the bouncer will be shown
*/
public boolean isMethodInsecure() {
return mMethodInsecure;
}
public void addListener(OnUnlockMethodChangedListener listener) {
mListeners.add(listener);
}
public void removeListener(OnUnlockMethodChangedListener listener) {
mListeners.remove(listener);
}
private void updateMethodSecure(boolean updateAlways) {
int user = mLockPatternUtils.getCurrentUser();
boolean methodInsecure = !mLockPatternUtils.isSecure() ||
mKeyguardUpdateMonitor.getUserHasTrust(user);
boolean changed = methodInsecure != mMethodInsecure;
if (changed || updateAlways) {
mMethodInsecure = methodInsecure;
notifyListeners(mMethodInsecure);
}
}
private void notifyListeners(boolean secure) {
for (OnUnlockMethodChangedListener listener : mListeners) {
listener.onMethodSecureChanged(secure);
}
}
private final KeyguardUpdateMonitorCallback mCallback = new KeyguardUpdateMonitorCallback() {
@Override
public void onUserSwitchComplete(int userId) {
updateMethodSecure(false /* updateAlways */);
}
@Override
public void onTrustChanged(int userId) {
updateMethodSecure(false /* updateAlways */);
}
@Override
public void onScreenTurnedOn() {
updateMethodSecure(false /* updateAlways */);
}
public void onFingerprintRecognized(int userId) {
updateMethodSecure(false /* updateAlways */);
}
};
public static interface OnUnlockMethodChangedListener {
void onMethodSecureChanged(boolean methodSecure);
}
}
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