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/*
* Copyright (C) 2013 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.server.policy.keyguard;
import android.app.ActivityManager;
import android.content.Context;
import android.content.ContentResolver;
import android.os.RemoteException;
import android.util.Slog;
import com.android.internal.policy.IKeyguardService;
import com.android.internal.policy.IKeyguardStateCallback;
import com.android.internal.widget.LockPatternUtils;
import lineageos.providers.LineageSettings;
import vendor.lineage.trust.V1_0.IUsbRestrict;
import java.io.PrintWriter;
import java.util.NoSuchElementException;
/**
* Maintains a cached copy of Keyguard's state.
* @hide
*/
public class KeyguardStateMonitor extends IKeyguardStateCallback.Stub {
private static final String TAG = "KeyguardStateMonitor";
// These cache the current state of Keyguard to improve performance and avoid deadlock. After
// Keyguard changes its state, it always triggers a layout in window manager. Because
// IKeyguardStateCallback is synchronous and because these states are declared volatile, it's
// guaranteed that window manager picks up the new state all the time in the layout caused by
// the state change of Keyguard. To be extra safe, assume most restrictive values until Keyguard
// tells us the actual value.
private volatile boolean mIsShowing = true;
private volatile boolean mSimSecure = true;
private volatile boolean mInputRestricted = true;
private volatile boolean mTrusted = false;
private volatile boolean mHasLockscreenWallpaper = false;
private int mCurrentUserId;
private final LockPatternUtils mLockPatternUtils;
private final StateCallback mCallback;
private IUsbRestrict mUsbRestrictor = null;
private ContentResolver mContentResolver;
public KeyguardStateMonitor(Context context, IKeyguardService service, StateCallback callback) {
mLockPatternUtils = new LockPatternUtils(context);
mCurrentUserId = ActivityManager.getCurrentUser();
mCallback = callback;
mContentResolver = context.getContentResolver();
try {
service.addStateMonitorCallback(this);
} catch (RemoteException e) {
Slog.w(TAG, "Remote Exception", e);
}
}
public boolean isShowing() {
return mIsShowing;
}
public boolean isSecure(int userId) {
return mLockPatternUtils.isSecure(userId) || mSimSecure;
}
public boolean isInputRestricted() {
return mInputRestricted;
}
public boolean isTrusted() {
return mTrusted;
}
public boolean hasLockscreenWallpaper() {
return mHasLockscreenWallpaper;
}
@Override // Binder interface
public void onShowingStateChanged(boolean showing) {
mIsShowing = showing;
mCallback.onShowingChanged();
if (mUsbRestrictor == null) {
try {
mUsbRestrictor = IUsbRestrict.getService();
} catch (NoSuchElementException | RemoteException ignored) {
// Ignore, the hal is not available
return;
}
}
if (mUsbRestrictor == null) {
// Return for now and retry on next time
return;
}
boolean shouldRestrictUsb = LineageSettings.Secure.getInt(mContentResolver,
LineageSettings.Secure.TRUST_RESTRICT_USB_KEYGUARD, 0) == 1;
if (shouldRestrictUsb) {
try {
mUsbRestrictor.setEnabled(showing);
} catch (RemoteException ignored) {
// This feature is not supported
}
}
}
@Override // Binder interface
public void onSimSecureStateChanged(boolean simSecure) {
mSimSecure = simSecure;
}
public synchronized void setCurrentUser(int userId) {
mCurrentUserId = userId;
}
@Override // Binder interface
public void onInputRestrictedStateChanged(boolean inputRestricted) {
mInputRestricted = inputRestricted;
}
@Override // Binder interface
public void onTrustedChanged(boolean trusted) {
mTrusted = trusted;
mCallback.onTrustedChanged();
}
@Override // Binder interface
public void onHasLockscreenWallpaperChanged(boolean hasLockscreenWallpaper) {
mHasLockscreenWallpaper = hasLockscreenWallpaper;
}
public interface StateCallback {
void onTrustedChanged();
void onShowingChanged();
}
public void dump(String prefix, PrintWriter pw) {
pw.println(prefix + TAG);
prefix += " ";
pw.println(prefix + "mIsShowing=" + mIsShowing);
pw.println(prefix + "mSimSecure=" + mSimSecure);
pw.println(prefix + "mInputRestricted=" + mInputRestricted);
pw.println(prefix + "mTrusted=" + mTrusted);
pw.println(prefix + "mCurrentUserId=" + mCurrentUserId);
}
}
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