1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package com.android.settings.biometrics.face; 18 19 import android.content.Context; 20 import android.hardware.face.FaceManager; 21 import android.hardware.face.FaceManager.GetFeatureCallback; 22 import android.hardware.face.FaceManager.SetFeatureCallback; 23 import android.provider.Settings; 24 25 import androidx.preference.PreferenceScreen; 26 import androidx.preference.SwitchPreference; 27 28 import com.android.settings.Utils; 29 30 /** 31 * Preference controller that manages the ability to use face authentication with/without 32 * user attention. See {@link FaceManager#setRequireAttention(boolean, byte[])}. 33 */ 34 public class FaceSettingsAttentionPreferenceController extends FaceSettingsPreferenceController { 35 36 public static final String KEY = "security_settings_face_require_attention"; 37 38 private byte[] mToken; 39 private FaceManager mFaceManager; 40 private SwitchPreference mPreference; 41 42 private final SetFeatureCallback mSetFeatureCallback = new SetFeatureCallback() { 43 @Override 44 public void onCompleted(boolean success, int feature) { 45 if (feature == FaceManager.FEATURE_REQUIRE_ATTENTION) { 46 mPreference.setEnabled(true); 47 if (!success) { 48 mPreference.setChecked(!mPreference.isChecked()); 49 } else { 50 Settings.Secure.putIntForUser(mContext.getContentResolver(), 51 Settings.Secure.FACE_UNLOCK_ATTENTION_REQUIRED, 52 mPreference.isChecked() ? 1 : 0, getUserId()); 53 } 54 } 55 } 56 }; 57 58 private final GetFeatureCallback mGetFeatureCallback = new GetFeatureCallback() { 59 @Override 60 public void onCompleted(boolean success, int[] features, boolean[] featureState) { 61 boolean requireAttentionEnabled = false; 62 for (int i = 0; i < features.length; i++) { 63 if (features[i] == FaceManager.FEATURE_REQUIRE_ATTENTION) { 64 requireAttentionEnabled = featureState[i]; 65 } 66 } 67 mPreference.setEnabled(success); 68 mPreference.setChecked(requireAttentionEnabled); 69 } 70 }; 71 FaceSettingsAttentionPreferenceController(Context context, String preferenceKey)72 public FaceSettingsAttentionPreferenceController(Context context, String preferenceKey) { 73 super(context, preferenceKey); 74 mFaceManager = Utils.getFaceManagerOrNull(context); 75 } 76 FaceSettingsAttentionPreferenceController(Context context)77 public FaceSettingsAttentionPreferenceController(Context context) { 78 this(context, KEY); 79 } 80 setToken(byte[] token)81 public void setToken(byte[] token) { 82 mToken = token; 83 } 84 85 /** 86 * Displays preference in this controller. 87 */ 88 @Override displayPreference(PreferenceScreen screen)89 public void displayPreference(PreferenceScreen screen) { 90 super.displayPreference(screen); 91 mPreference = screen.findPreference(KEY); 92 } 93 94 @Override isChecked()95 public boolean isChecked() { 96 if (!FaceSettings.isFaceHardwareDetected(mContext)) { 97 return true; 98 } 99 // Set to disabled until we know the true value. 100 mPreference.setEnabled(false); 101 mFaceManager.getFeature(getUserId(), FaceManager.FEATURE_REQUIRE_ATTENTION, 102 mGetFeatureCallback); 103 104 // Ideally returns a cached value. 105 return true; 106 } 107 108 @Override setChecked(boolean isChecked)109 public boolean setChecked(boolean isChecked) { 110 // Optimistically update state and set to disabled until we know it succeeded. 111 mPreference.setEnabled(false); 112 mPreference.setChecked(isChecked); 113 114 mFaceManager.setFeature(getUserId(), FaceManager.FEATURE_REQUIRE_ATTENTION, isChecked, 115 mToken, mSetFeatureCallback); 116 return true; 117 } 118 119 @Override isSliceable()120 public boolean isSliceable() { 121 return false; 122 } 123 124 @Override getAvailabilityStatus()125 public int getAvailabilityStatus() { 126 return AVAILABLE; 127 } 128 } 129