/* * Copyright (C) 2021 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; import static android.hardware.biometrics.BiometricStateListener.STATE_BP_AUTH; import static android.hardware.biometrics.BiometricStateListener.STATE_ENROLLING; import static android.hardware.biometrics.BiometricStateListener.STATE_IDLE; import static android.hardware.biometrics.BiometricStateListener.STATE_KEYGUARD_AUTH; import android.annotation.NonNull; import android.annotation.Nullable; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.pm.PackageManager; import android.hardware.biometrics.BiometricStateListener; import android.hardware.fingerprint.FingerprintManager; import android.hardware.fingerprint.FingerprintSensorPropertiesInternal; import android.hardware.fingerprint.IFingerprintAuthenticatorsRegisteredCallback; import android.os.Handler; import android.os.PowerManager; import android.util.Log; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.view.accessibility.AccessibilityManager; import com.android.internal.R; import com.android.internal.annotations.VisibleForTesting; import java.util.List; import java.util.concurrent.atomic.AtomicBoolean; /** * Defines behavior for handling interactions between power button events and fingerprint-related * operations, for devices where the fingerprint sensor (side fps) lives on the power button. */ public class SideFpsEventHandler implements View.OnClickListener { private static final int DEBOUNCE_DELAY_MILLIS = 500; private static final String TAG = "SideFpsEventHandler"; @NonNull private final Context mContext; @NonNull private final Handler mHandler; @NonNull private final PowerManager mPowerManager; @NonNull private final AtomicBoolean mSideFpsEventHandlerReady; private final int mDismissDialogTimeout; @Nullable private SideFpsToast mDialog; private final AccessibilityManager mAccessibilityManager; private final Runnable mTurnOffDialog = () -> { dismissDialog("mTurnOffDialog"); }; private @BiometricStateListener.State int mBiometricState; private FingerprintManager mFingerprintManager; private DialogProvider mDialogProvider; private long mLastPowerPressTime; SideFpsEventHandler( Context context, Handler handler, PowerManager powerManager) { this(context, handler, powerManager, (ctx) -> { SideFpsToast dialog = new SideFpsToast(ctx); dialog.getWindow() .setType(WindowManager.LayoutParams.TYPE_STATUS_BAR_SUB_PANEL); dialog.requestWindowFeature(Window.FEATURE_NO_TITLE); return dialog; }); } @VisibleForTesting SideFpsEventHandler( Context context, Handler handler, PowerManager powerManager, DialogProvider provider) { mContext = context; mHandler = handler; mAccessibilityManager = mContext.getSystemService(AccessibilityManager.class); mPowerManager = powerManager; mBiometricState = STATE_IDLE; mSideFpsEventHandlerReady = new AtomicBoolean(false); mDialogProvider = provider; // ensure dialog is dismissed if screen goes off for unrelated reasons context.registerReceiver( new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { if (mDialog != null) { mDialog.dismiss(); mDialog = null; } } }, new IntentFilter(Intent.ACTION_SCREEN_OFF)); mDismissDialogTimeout = context.getResources().getInteger( R.integer.config_sideFpsToastTimeout); } @Override public void onClick(View v) { goToSleep(mLastPowerPressTime); } /** * Called from {@link PhoneWindowManager} to notify FingerprintManager that a single tap power * button has been pressed. */ public void notifyPowerPressed() { Log.i(TAG, "notifyPowerPressed"); if (mFingerprintManager == null && mSideFpsEventHandlerReady.get()) { mFingerprintManager = mContext.getSystemService(FingerprintManager.class); } if (mFingerprintManager == null) { return; } mFingerprintManager.onPowerPressed(); } /** * Called from {@link PhoneWindowManager} and will dictate if the SideFpsEventHandler should * handle the power press. * * @param eventTime powerPress event time * @return true if powerPress was consumed, false otherwise */ public boolean shouldConsumeSinglePress(long eventTime) { if (!mSideFpsEventHandlerReady.get()) { return false; } switch (mBiometricState) { case STATE_ENROLLING: mHandler.post( () -> { if (mHandler.hasCallbacks(mTurnOffDialog)) { Log.v(TAG, "Detected a tap to turn off dialog, ignoring"); mHandler.removeCallbacks(mTurnOffDialog); } showDialog(eventTime, "Enroll Power Press"); if (!mAccessibilityManager.isEnabled()) { mHandler.postDelayed(mTurnOffDialog, mDismissDialogTimeout); } }); return true; case STATE_BP_AUTH: return true; case STATE_KEYGUARD_AUTH: default: return false; } } private void goToSleep(long eventTime) { mPowerManager.goToSleep( eventTime, PowerManager.GO_TO_SLEEP_REASON_POWER_BUTTON, 0 /* flags */); } /** * Awaits notification from PhoneWindowManager that fingerprint service is ready to send updates * about power button fps sensor state. Then configures a BiometricStateListener to receive and * record updates to fps state, and registers the BiometricStateListener in FingerprintManager. */ public void onFingerprintSensorReady() { final PackageManager pm = mContext.getPackageManager(); if (!pm.hasSystemFeature(PackageManager.FEATURE_FINGERPRINT)) { return; } final FingerprintManager fingerprintManager = mContext.getSystemService(FingerprintManager.class); fingerprintManager.addAuthenticatorsRegisteredCallback( new IFingerprintAuthenticatorsRegisteredCallback.Stub() { @Override public void onAllAuthenticatorsRegistered( List sensors) { if (fingerprintManager.isPowerbuttonFps()) { fingerprintManager.registerBiometricStateListener( new BiometricStateListener() { @Nullable private Runnable mStateRunnable = null; @Override public void onStateChanged( @BiometricStateListener.State int newState) { Log.d(TAG, "onStateChanged : " + newState); if (mStateRunnable != null) { mHandler.removeCallbacks(mStateRunnable); mStateRunnable = null; } // When the user hits the power button the events can // arrive in any order (success auth & power). Add a // damper when moving to idle in case auth is first if (newState == STATE_IDLE) { mStateRunnable = () -> mBiometricState = newState; // This is also useful in the case of biometric // prompt. // If a user has recently succeeded/failed auth, we // want to disable the power button for a short // period of time (so ethey are able to view the // prompt) mHandler.postDelayed( mStateRunnable, DEBOUNCE_DELAY_MILLIS); dismissDialog("STATE_IDLE"); } else { mBiometricState = newState; } } @Override public void onBiometricAction( @BiometricStateListener.Action int action) { Log.d(TAG, "onBiometricAction " + action); if (mAccessibilityManager != null && mAccessibilityManager.isEnabled()) { dismissDialog("mTurnOffDialog"); } } }); mSideFpsEventHandlerReady.set(true); } } }); } private void dismissDialog(String reason) { Log.d(TAG, "Dismissing dialog with reason: " + reason); if (mDialog != null && mDialog.isShowing()) { mDialog.dismiss(); } } private void showDialog(long time, String reason) { Log.d(TAG, "Showing dialog with reason: " + reason); if (mDialog != null && mDialog.isShowing()) { Log.d(TAG, "Ignoring show dialog"); return; } mDialog = mDialogProvider.provideDialog(mContext); mLastPowerPressTime = time; mDialog.show(); mDialog.setOnClickListener(this); if (mAccessibilityManager.isEnabled()) { mDialog.addAccessibilityDelegate(); } } interface DialogProvider { SideFpsToast provideDialog(Context context); } }