/* * Copyright (C) 2018 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 android.hardware.face; import static android.Manifest.permission.INTERACT_ACROSS_USERS; import static android.Manifest.permission.MANAGE_BIOMETRIC; import static android.Manifest.permission.USE_BIOMETRIC_INTERNAL; import static android.hardware.biometrics.BiometricConstants.BIOMETRIC_LOCKOUT_NONE; import android.annotation.NonNull; import android.annotation.Nullable; import android.annotation.RequiresPermission; import android.annotation.SystemService; import android.content.Context; import android.content.pm.PackageManager; import android.hardware.biometrics.BiometricAuthenticator; import android.hardware.biometrics.BiometricConstants; import android.hardware.biometrics.BiometricFaceConstants; import android.hardware.biometrics.BiometricStateListener; import android.hardware.biometrics.CryptoObject; import android.hardware.biometrics.IBiometricServiceLockoutResetCallback; import android.os.Binder; import android.os.CancellationSignal; import android.os.CancellationSignal.OnCancelListener; import android.os.Handler; import android.os.IBinder; import android.os.IRemoteCallback; import android.os.Looper; import android.os.PowerManager; import android.os.RemoteException; import android.os.Trace; import android.os.UserHandle; import android.provider.Settings; import android.util.Slog; import android.view.Surface; import com.android.internal.R; import com.android.internal.os.SomeArgs; import java.util.ArrayList; import java.util.List; /** * A class that coordinates access to the face authentication hardware. * @hide */ @SystemService(Context.FACE_SERVICE) public class FaceManager implements BiometricAuthenticator, BiometricFaceConstants { private static final String TAG = "FaceManager"; private static final int MSG_ENROLL_RESULT = 100; private static final int MSG_ACQUIRED = 101; private static final int MSG_AUTHENTICATION_SUCCEEDED = 102; private static final int MSG_AUTHENTICATION_FAILED = 103; private static final int MSG_ERROR = 104; private static final int MSG_REMOVED = 105; private static final int MSG_GET_FEATURE_COMPLETED = 106; private static final int MSG_SET_FEATURE_COMPLETED = 107; private static final int MSG_CHALLENGE_GENERATED = 108; private static final int MSG_FACE_DETECTED = 109; private static final int MSG_AUTHENTICATION_FRAME = 112; private static final int MSG_ENROLLMENT_FRAME = 113; private final IFaceService mService; private final Context mContext; private final IBinder mToken = new Binder(); @Nullable private AuthenticationCallback mAuthenticationCallback; @Nullable private FaceDetectionCallback mFaceDetectionCallback; @Nullable private EnrollmentCallback mEnrollmentCallback; @Nullable private RemovalCallback mRemovalCallback; @Nullable private SetFeatureCallback mSetFeatureCallback; @Nullable private GetFeatureCallback mGetFeatureCallback; @Nullable private GenerateChallengeCallback mGenerateChallengeCallback; private CryptoObject mCryptoObject; private Face mRemovalFace; private Handler mHandler; private List mProps = new ArrayList<>(); private final IFaceServiceReceiver mServiceReceiver = new IFaceServiceReceiver.Stub() { @Override // binder call public void onEnrollResult(Face face, int remaining) { mHandler.obtainMessage(MSG_ENROLL_RESULT, remaining, 0, face).sendToTarget(); } @Override // binder call public void onAcquired(int acquireInfo, int vendorCode) { mHandler.obtainMessage(MSG_ACQUIRED, acquireInfo, vendorCode).sendToTarget(); } @Override // binder call public void onAuthenticationSucceeded(Face face, int userId, boolean isStrongBiometric) { mHandler.obtainMessage(MSG_AUTHENTICATION_SUCCEEDED, userId, isStrongBiometric ? 1 : 0, face).sendToTarget(); } @Override // binder call public void onFaceDetected(int sensorId, int userId, boolean isStrongBiometric) { mHandler.obtainMessage(MSG_FACE_DETECTED, sensorId, userId, isStrongBiometric) .sendToTarget(); } @Override // binder call public void onAuthenticationFailed() { mHandler.obtainMessage(MSG_AUTHENTICATION_FAILED).sendToTarget(); } @Override // binder call public void onError(int error, int vendorCode) { mHandler.obtainMessage(MSG_ERROR, error, vendorCode).sendToTarget(); } @Override // binder call public void onRemoved(Face face, int remaining) { mHandler.obtainMessage(MSG_REMOVED, remaining, 0, face).sendToTarget(); if (remaining == 0) { Settings.Secure.putIntForUser(mContext.getContentResolver(), Settings.Secure.FACE_UNLOCK_RE_ENROLL, 0, UserHandle.USER_CURRENT); } } @Override public void onFeatureSet(boolean success, int feature) { mHandler.obtainMessage(MSG_SET_FEATURE_COMPLETED, feature, 0, success).sendToTarget(); } @Override public void onFeatureGet(boolean success, int[] features, boolean[] featureState) { SomeArgs args = SomeArgs.obtain(); args.arg1 = success; args.arg2 = features; args.arg3 = featureState; mHandler.obtainMessage(MSG_GET_FEATURE_COMPLETED, args).sendToTarget(); } @Override public void onChallengeGenerated(int sensorId, int userId, long challenge) { mHandler.obtainMessage(MSG_CHALLENGE_GENERATED, sensorId, userId, challenge) .sendToTarget(); } @Override public void onAuthenticationFrame(FaceAuthenticationFrame frame) { mHandler.obtainMessage(MSG_AUTHENTICATION_FRAME, frame).sendToTarget(); } @Override public void onEnrollmentFrame(FaceEnrollFrame frame) { mHandler.obtainMessage(MSG_ENROLLMENT_FRAME, frame).sendToTarget(); } }; /** * @hide */ public FaceManager(Context context, IFaceService service) { mContext = context; mService = service; if (mService == null) { Slog.v(TAG, "FaceAuthenticationManagerService was null"); } mHandler = new MyHandler(context); if (context.checkCallingOrSelfPermission(USE_BIOMETRIC_INTERNAL) == PackageManager.PERMISSION_GRANTED) { addAuthenticatorsRegisteredCallback(new IFaceAuthenticatorsRegisteredCallback.Stub() { @Override public void onAllAuthenticatorsRegistered( @NonNull List sensors) { mProps = sensors; } }); } } /** * Use the provided handler thread for events. */ private void useHandler(Handler handler) { if (handler != null) { mHandler = new MyHandler(handler.getLooper()); } else if (mHandler.getLooper() != mContext.getMainLooper()) { mHandler = new MyHandler(mContext.getMainLooper()); } } /** * @deprecated use {@link #authenticate(CryptoObject, CancellationSignal, AuthenticationCallback, Handler, FaceAuthenticateOptions)}. */ @Deprecated @RequiresPermission(USE_BIOMETRIC_INTERNAL) public void authenticate(@Nullable CryptoObject crypto, @Nullable CancellationSignal cancel, @NonNull AuthenticationCallback callback, @Nullable Handler handler, int userId) { authenticate(crypto, cancel, callback, handler, new FaceAuthenticateOptions.Builder() .setUserId(userId) .build()); } /** * Request authentication. This call operates the face recognition hardware and starts capturing images. * It terminates when * {@link AuthenticationCallback#onAuthenticationError(int, CharSequence)} or * {@link AuthenticationCallback#onAuthenticationSucceeded(AuthenticationResult)} is called, at * which point the object is no longer valid. The operation can be canceled by using the * provided cancel object. * * @param crypto object associated with the call or null if none required * @param cancel an object that can be used to cancel authentication * @param callback an object to receive authentication events * @param handler an optional handler to handle callback events * @param options additional options to customize this request * @throws IllegalArgumentException if the crypto operation is not supported or is not backed * by * Android * Keystore facility. * @throws IllegalStateException if the crypto primitive is not initialized. * @hide */ @RequiresPermission(USE_BIOMETRIC_INTERNAL) public void authenticate(@Nullable CryptoObject crypto, @Nullable CancellationSignal cancel, @NonNull AuthenticationCallback callback, @Nullable Handler handler, @NonNull FaceAuthenticateOptions options) { if (callback == null) { throw new IllegalArgumentException("Must supply an authentication callback"); } if (cancel != null && cancel.isCanceled()) { Slog.w(TAG, "authentication already canceled"); return; } options.setOpPackageName(mContext.getOpPackageName()); options.setAttributionTag(mContext.getAttributionTag()); if (mService != null) { try { useHandler(handler); mAuthenticationCallback = callback; mCryptoObject = crypto; final long operationId = crypto != null ? crypto.getOpId() : 0; Trace.beginSection("FaceManager#authenticate"); final long authId = mService.authenticate( mToken, operationId, mServiceReceiver, options); if (cancel != null) { cancel.setOnCancelListener(new OnAuthenticationCancelListener(authId)); } } catch (RemoteException e) { Slog.w(TAG, "Remote exception while authenticating: ", e); // Though this may not be a hardware issue, it will cause apps to give up or // try again later. callback.onAuthenticationError(FACE_ERROR_HW_UNAVAILABLE, getErrorString(mContext, FACE_ERROR_HW_UNAVAILABLE, 0 /* vendorCode */)); } finally { Trace.endSection(); } } } /** * Uses the face hardware to detect for the presence of a face, without giving details about * accept/reject/lockout. * @hide */ @RequiresPermission(USE_BIOMETRIC_INTERNAL) public void detectFace(@NonNull CancellationSignal cancel, @NonNull FaceDetectionCallback callback, @NonNull FaceAuthenticateOptions options) { if (mService == null) { return; } if (cancel.isCanceled()) { Slog.w(TAG, "Detection already cancelled"); return; } options.setOpPackageName(mContext.getOpPackageName()); options.setAttributionTag(mContext.getAttributionTag()); mFaceDetectionCallback = callback; try { final long authId = mService.detectFace(mToken, mServiceReceiver, options); cancel.setOnCancelListener(new OnFaceDetectionCancelListener(authId)); } catch (RemoteException e) { Slog.w(TAG, "Remote exception when requesting finger detect", e); } } /** * Defaults to {@link FaceManager#enroll(int, byte[], CancellationSignal, EnrollmentCallback, * int[], Surface)} with {@code previewSurface} set to null. * * @see FaceManager#enroll(int, byte[], CancellationSignal, EnrollmentCallback, int[], Surface) * @hide */ @RequiresPermission(MANAGE_BIOMETRIC) public void enroll(int userId, byte[] hardwareAuthToken, CancellationSignal cancel, EnrollmentCallback callback, int[] disabledFeatures) { enroll(userId, hardwareAuthToken, cancel, callback, disabledFeatures, null /* previewSurface */, false /* debugConsent */); } /** * Request face authentication enrollment. This call operates the face authentication hardware * and starts capturing images. Progress will be indicated by callbacks to the * {@link EnrollmentCallback} object. It terminates when * {@link EnrollmentCallback#onEnrollmentError(int, CharSequence)} or * {@link EnrollmentCallback#onEnrollmentProgress(int) is called with remaining == 0, at * which point the object is no longer valid. The operation can be canceled by using the * provided cancel object. * * @param hardwareAuthToken a unique token provided by a recent creation or * verification of device credentials (e.g. pin, pattern or password). * @param cancel an object that can be used to cancel enrollment * @param userId the user to whom this face will belong to * @param callback an object to receive enrollment events * @param previewSurface optional camera preview surface for a single-camera device. * Must be null if not used. * @param debugConsent a feature flag that the user has consented to debug. * @hide */ @RequiresPermission(MANAGE_BIOMETRIC) public void enroll(int userId, byte[] hardwareAuthToken, CancellationSignal cancel, EnrollmentCallback callback, int[] disabledFeatures, @Nullable Surface previewSurface, boolean debugConsent) { if (callback == null) { throw new IllegalArgumentException("Must supply an enrollment callback"); } if (cancel != null && cancel.isCanceled()) { Slog.w(TAG, "enrollment already canceled"); return; } if (hardwareAuthToken == null) { callback.onEnrollmentError(FACE_ERROR_UNABLE_TO_PROCESS, getErrorString(mContext, FACE_ERROR_UNABLE_TO_PROCESS, 0 /* vendorCode */)); return; } if (getEnrolledFaces(userId).size() >= mContext.getResources().getInteger(R.integer.config_faceMaxTemplatesPerUser)) { callback.onEnrollmentError(FACE_ERROR_HW_UNAVAILABLE, getErrorString(mContext, FACE_ERROR_HW_UNAVAILABLE, 0 /* vendorCode */)); return; } if (mService != null) { try { mEnrollmentCallback = callback; Trace.beginSection("FaceManager#enroll"); final long enrollId = mService.enroll(userId, mToken, hardwareAuthToken, mServiceReceiver, mContext.getOpPackageName(), disabledFeatures, previewSurface, debugConsent); if (cancel != null) { cancel.setOnCancelListener(new OnEnrollCancelListener(enrollId)); } } catch (RemoteException e) { Slog.w(TAG, "Remote exception in enroll: ", e); // Though this may not be a hardware issue, it will cause apps to give up or // try again later. callback.onEnrollmentError(FACE_ERROR_HW_UNAVAILABLE, getErrorString(mContext, FACE_ERROR_HW_UNAVAILABLE, 0 /* vendorCode */)); } finally { Trace.endSection(); } } } /** * Request face authentication enrollment for a remote client, for example Android Auto. * This call operates the face authentication hardware and starts capturing images. * Progress will be indicated by callbacks to the * {@link EnrollmentCallback} object. It terminates when * {@link EnrollmentCallback#onEnrollmentError(int, CharSequence)} or * {@link EnrollmentCallback#onEnrollmentProgress(int) is called with remaining == 0, at * which point the object is no longer valid. The operation can be canceled by using the * provided cancel object. * * @param hardwareAuthToken a unique token provided by a recent creation or verification of * device credentials (e.g. pin, pattern or password). * @param cancel an object that can be used to cancel enrollment * @param userId the user to whom this face will belong to * @param callback an object to receive enrollment events * @hide */ @RequiresPermission(MANAGE_BIOMETRIC) public void enrollRemotely(int userId, byte[] hardwareAuthToken, CancellationSignal cancel, EnrollmentCallback callback, int[] disabledFeatures) { if (callback == null) { throw new IllegalArgumentException("Must supply an enrollment callback"); } if (cancel != null && cancel.isCanceled()) { Slog.w(TAG, "enrollRemotely is already canceled."); return; } if (mService != null) { try { mEnrollmentCallback = callback; Trace.beginSection("FaceManager#enrollRemotely"); final long enrolId = mService.enrollRemotely(userId, mToken, hardwareAuthToken, mServiceReceiver, mContext.getOpPackageName(), disabledFeatures); if (cancel != null) { cancel.setOnCancelListener(new OnEnrollCancelListener(enrolId)); } } catch (RemoteException e) { Slog.w(TAG, "Remote exception in enrollRemotely: ", e); // Though this may not be a hardware issue, it will cause apps to give up or // try again later. callback.onEnrollmentError(FACE_ERROR_HW_UNAVAILABLE, getErrorString(mContext, FACE_ERROR_HW_UNAVAILABLE, 0 /* vendorCode */)); } finally { Trace.endSection(); } } } /** * Generates a unique random challenge in the TEE. A typical use case is to have it wrapped in a * HardwareAuthenticationToken, minted by Gatekeeper upon PIN/Pattern/Password verification. * The HardwareAuthenticationToken can then be sent to the biometric HAL together with a * request to perform sensitive operation(s) (for example enroll or setFeature), represented * by the challenge. Doing this ensures that a the sensitive operation cannot be performed * unless the user has entered confirmed PIN/Pattern/Password. * * @see com.android.server.locksettings.LockSettingsService * * @hide */ @RequiresPermission(MANAGE_BIOMETRIC) public void generateChallenge(int sensorId, int userId, GenerateChallengeCallback callback) { if (mService != null) { try { mGenerateChallengeCallback = callback; mService.generateChallenge(mToken, sensorId, userId, mServiceReceiver, mContext.getOpPackageName()); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } } /** * Same as {@link #generateChallenge(int, int, GenerateChallengeCallback)}, but assumes the * first enumerated sensor. * * @hide */ @RequiresPermission(MANAGE_BIOMETRIC) public void generateChallenge(int userId, GenerateChallengeCallback callback) { final List faceSensorProperties = getSensorPropertiesInternal(); if (faceSensorProperties.isEmpty()) { Slog.e(TAG, "No sensors"); return; } final int sensorId = faceSensorProperties.get(0).sensorId; generateChallenge(sensorId, userId, callback); } /** * Invalidates the current challenge. * * @hide */ @RequiresPermission(MANAGE_BIOMETRIC) public void revokeChallenge(int sensorId, int userId, long challenge) { if (mService != null) { try { mService.revokeChallenge(mToken, sensorId, userId, mContext.getOpPackageName(), challenge); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } } /** * Reset the lockout when user authenticates with strong auth (e.g. PIN, pattern or password) * * @param sensorId Sensor ID that this operation takes effect for * @param userId User ID that this operation takes effect for. * @param hardwareAuthToken An opaque token returned by password confirmation. * @hide */ @RequiresPermission(USE_BIOMETRIC_INTERNAL) public void resetLockout(int sensorId, int userId, @Nullable byte[] hardwareAuthToken) { if (mService != null) { try { mService.resetLockout(mToken, sensorId, userId, hardwareAuthToken, mContext.getOpPackageName()); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } } /** * @hide */ @RequiresPermission(MANAGE_BIOMETRIC) public void setFeature(int userId, int feature, boolean enabled, byte[] hardwareAuthToken, SetFeatureCallback callback) { if (mService != null) { try { mSetFeatureCallback = callback; mService.setFeature(mToken, userId, feature, enabled, hardwareAuthToken, mServiceReceiver, mContext.getOpPackageName()); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } } /** * @hide */ @RequiresPermission(MANAGE_BIOMETRIC) public void getFeature(int userId, int feature, GetFeatureCallback callback) { if (mService != null) { try { mGetFeatureCallback = callback; mService.getFeature(mToken, userId, feature, mServiceReceiver, mContext.getOpPackageName()); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } } /** * Remove given face template from face hardware and/or protected storage. * * @param face the face item to remove * @param userId the user who this face belongs to * @param callback an optional callback to verify that face templates have been * successfully removed. May be null if no callback is required. * @hide */ @RequiresPermission(MANAGE_BIOMETRIC) public void remove(Face face, int userId, RemovalCallback callback) { if (mService != null) { try { mRemovalCallback = callback; mRemovalFace = face; mService.remove(mToken, face.getBiometricId(), userId, mServiceReceiver, mContext.getOpPackageName()); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } } /** * Removes all face templates for the given user. * @hide */ @RequiresPermission(MANAGE_BIOMETRIC) public void removeAll(int userId, @NonNull RemovalCallback callback) { if (mService != null) { try { mRemovalCallback = callback; mService.removeAll(mToken, userId, mServiceReceiver, mContext.getOpPackageName()); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } } /** * Obtain the enrolled face template. * * @return the current face item * @hide */ @RequiresPermission(MANAGE_BIOMETRIC) public List getEnrolledFaces(int userId) { final List faceSensorProperties = getSensorPropertiesInternal(); if (faceSensorProperties.isEmpty()) { Slog.e(TAG, "No sensors"); return new ArrayList<>(); } if (mService != null) { try { return mService.getEnrolledFaces(faceSensorProperties.get(0).sensorId, userId, mContext.getOpPackageName()); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } return null; } /** * Obtain the enrolled face template. * * @return the current face item * @hide */ @RequiresPermission(MANAGE_BIOMETRIC) public List getEnrolledFaces() { return getEnrolledFaces(UserHandle.myUserId()); } /** * Determine if there is a face enrolled. * * @return true if a face is enrolled, false otherwise * @hide */ @RequiresPermission(USE_BIOMETRIC_INTERNAL) public boolean hasEnrolledTemplates() { return hasEnrolledTemplates(UserHandle.myUserId()); } /** * @hide */ @RequiresPermission(allOf = { USE_BIOMETRIC_INTERNAL, INTERACT_ACROSS_USERS}) public boolean hasEnrolledTemplates(int userId) { final List faceSensorProperties = getSensorPropertiesInternal(); if (faceSensorProperties.isEmpty()) { Slog.e(TAG, "No sensors"); return false; } if (mService != null) { try { return mService.hasEnrolledFaces(faceSensorProperties.get(0).sensorId, userId, mContext.getOpPackageName()); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } return false; } /** * Determine if face authentication sensor hardware is present and functional. * * @return true if hardware is present and functional, false otherwise. * @hide */ @RequiresPermission(USE_BIOMETRIC_INTERNAL) public boolean isHardwareDetected() { final List faceSensorProperties = getSensorPropertiesInternal(); if (faceSensorProperties.isEmpty()) { Slog.e(TAG, "No sensors"); return false; } if (mService != null) { try { return mService.isHardwareDetected(faceSensorProperties.get(0).sensorId, mContext.getOpPackageName()); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } else { Slog.w(TAG, "isFaceHardwareDetected(): Service not connected!"); } return false; } /** * Retrieves a list of properties for all face authentication sensors on the device. * @hide */ @NonNull public List getSensorProperties() { final List properties = new ArrayList<>(); final List internalProperties = getSensorPropertiesInternal(); for (FaceSensorPropertiesInternal internalProp : internalProperties) { properties.add(FaceSensorProperties.from(internalProp)); } return properties; } /** * Get statically configured sensor properties. * @hide */ @RequiresPermission(USE_BIOMETRIC_INTERNAL) @NonNull public List getSensorPropertiesInternal() { try { if (!mProps.isEmpty() || mService == null) { return mProps; } return mService.getSensorPropertiesInternal(mContext.getOpPackageName()); } catch (RemoteException e) { e.rethrowFromSystemServer(); } return mProps; } /** * Forwards BiometricStateListener to FaceService. * * @param listener new BiometricStateListener being added * @hide */ public void registerBiometricStateListener(@NonNull BiometricStateListener listener) { try { mService.registerBiometricStateListener(listener); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } /** * Adds a callback that gets called when the service registers all of the face * authenticators (HALs). * * If the face authenticators are already registered when the callback is added, the * callback is invoked immediately. * * The callback is automatically removed after it's invoked. * * @hide */ @RequiresPermission(USE_BIOMETRIC_INTERNAL) public void addAuthenticatorsRegisteredCallback( IFaceAuthenticatorsRegisteredCallback callback) { if (mService != null) { try { mService.addAuthenticatorsRegisteredCallback(callback); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } else { Slog.w(TAG, "addAuthenticatorsRegisteredCallback(): Service not connected!"); } } /** * @hide */ @RequiresPermission(USE_BIOMETRIC_INTERNAL) @BiometricConstants.LockoutMode public int getLockoutModeForUser(int sensorId, int userId) { if (mService != null) { try { return mService.getLockoutModeForUser(sensorId, userId); } catch (RemoteException e) { e.rethrowFromSystemServer(); } } return BIOMETRIC_LOCKOUT_NONE; } /** * @hide */ @RequiresPermission(USE_BIOMETRIC_INTERNAL) public void addLockoutResetCallback(final LockoutResetCallback callback) { if (mService != null) { try { final PowerManager powerManager = mContext.getSystemService(PowerManager.class); mService.addLockoutResetCallback( new IBiometricServiceLockoutResetCallback.Stub() { @Override public void onLockoutReset(int sensorId, IRemoteCallback serverCallback) throws RemoteException { try { final PowerManager.WakeLock wakeLock = powerManager.newWakeLock( PowerManager.PARTIAL_WAKE_LOCK, "faceLockoutResetCallback"); wakeLock.acquire(); mHandler.post(() -> { try { callback.onLockoutReset(sensorId); } finally { wakeLock.release(); } }); } finally { serverCallback.sendResult(null /* data */); } } }, mContext.getOpPackageName()); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } else { Slog.w(TAG, "addLockoutResetCallback(): Service not connected!"); } } /** * Schedules a watchdog. * * @hide */ @RequiresPermission(USE_BIOMETRIC_INTERNAL) public void scheduleWatchdog() { try { mService.scheduleWatchdog(); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } private void cancelEnrollment(long requestId) { if (mService != null) { try { mService.cancelEnrollment(mToken, requestId); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } } private void cancelAuthentication(long requestId) { if (mService != null) { try { mService.cancelAuthentication(mToken, mContext.getOpPackageName(), requestId); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } } private void cancelFaceDetect(long requestId) { if (mService == null) { return; } try { mService.cancelFaceDetect(mToken, mContext.getOpPackageName(), requestId); } catch (RemoteException e) { throw e.rethrowFromSystemServer(); } } /** * @hide */ public static String getErrorString(Context context, int errMsg, int vendorCode) { switch (errMsg) { case FACE_ERROR_HW_UNAVAILABLE: return context.getString( com.android.internal.R.string.face_error_hw_not_available); case FACE_ERROR_UNABLE_TO_PROCESS: return context.getString( com.android.internal.R.string.face_error_unable_to_process); case FACE_ERROR_TIMEOUT: return context.getString(com.android.internal.R.string.face_error_timeout); case FACE_ERROR_NO_SPACE: return context.getString(com.android.internal.R.string.face_error_no_space); case FACE_ERROR_CANCELED: return context.getString(com.android.internal.R.string.face_error_canceled); case FACE_ERROR_LOCKOUT: return context.getString(com.android.internal.R.string.face_error_lockout); case FACE_ERROR_LOCKOUT_PERMANENT: return context.getString( com.android.internal.R.string.face_error_lockout_permanent); case FACE_ERROR_USER_CANCELED: return context.getString(com.android.internal.R.string.face_error_user_canceled); case FACE_ERROR_NOT_ENROLLED: return context.getString(com.android.internal.R.string.face_error_not_enrolled); case FACE_ERROR_HW_NOT_PRESENT: return context.getString(com.android.internal.R.string.face_error_hw_not_present); case BIOMETRIC_ERROR_SECURITY_UPDATE_REQUIRED: return context.getString( com.android.internal.R.string.face_error_security_update_required); case BIOMETRIC_ERROR_RE_ENROLL: return context.getString( com.android.internal.R.string.face_recalibrate_notification_content); case FACE_ERROR_VENDOR: { String[] msgArray = context.getResources().getStringArray( com.android.internal.R.array.face_error_vendor); if (vendorCode < msgArray.length) { return msgArray[vendorCode]; } } } // This is used as a last resort in case a vendor string is missing // It should not happen for anything other than FACE_ERROR_VENDOR, but // warn and use the default if all else fails. Slog.w(TAG, "Invalid error message: " + errMsg + ", " + vendorCode); return context.getString( com.android.internal.R.string.face_error_vendor_unknown); } /** * Used so BiometricPrompt can map the face ones onto existing public constants. * @hide */ public static int getMappedAcquiredInfo(int acquireInfo, int vendorCode) { switch (acquireInfo) { case FACE_ACQUIRED_GOOD: return BiometricConstants.BIOMETRIC_ACQUIRED_GOOD; case FACE_ACQUIRED_INSUFFICIENT: case FACE_ACQUIRED_TOO_BRIGHT: case FACE_ACQUIRED_TOO_DARK: return BiometricConstants.BIOMETRIC_ACQUIRED_INSUFFICIENT; case FACE_ACQUIRED_TOO_CLOSE: case FACE_ACQUIRED_TOO_FAR: case FACE_ACQUIRED_TOO_HIGH: case FACE_ACQUIRED_TOO_LOW: case FACE_ACQUIRED_TOO_RIGHT: case FACE_ACQUIRED_TOO_LEFT: return BiometricConstants.BIOMETRIC_ACQUIRED_PARTIAL; case FACE_ACQUIRED_POOR_GAZE: case FACE_ACQUIRED_NOT_DETECTED: case FACE_ACQUIRED_TOO_MUCH_MOTION: case FACE_ACQUIRED_RECALIBRATE: return BiometricConstants.BIOMETRIC_ACQUIRED_INSUFFICIENT; case FACE_ACQUIRED_VENDOR: return BiometricConstants.BIOMETRIC_ACQUIRED_VENDOR_BASE + vendorCode; default: return BiometricConstants.BIOMETRIC_ACQUIRED_GOOD; } } /** * Container for callback data from {@link FaceManager#authenticate(CryptoObject, * CancellationSignal, int, AuthenticationCallback, Handler)}. * @hide */ public static class AuthenticationResult { private final Face mFace; private final CryptoObject mCryptoObject; private final int mUserId; private final boolean mIsStrongBiometric; /** * Authentication result * * @param crypto the crypto object * @param face the recognized face data, if allowed. * @hide */ public AuthenticationResult(CryptoObject crypto, Face face, int userId, boolean isStrongBiometric) { mCryptoObject = crypto; mFace = face; mUserId = userId; mIsStrongBiometric = isStrongBiometric; } /** * Obtain the crypto object associated with this transaction * * @return crypto object provided to {@link FaceManager#authenticate * (CryptoObject, * CancellationSignal, int, AuthenticationCallback, Handler)}. */ public CryptoObject getCryptoObject() { return mCryptoObject; } /** * Obtain the Face associated with this operation. Applications are strongly * discouraged from associating specific faces with specific applications or operations. * * @hide */ public Face getFace() { return mFace; } /** * Obtain the userId for which this face was authenticated. * * @hide */ public int getUserId() { return mUserId; } /** * Check whether the strength of the face modality associated with this operation is strong * (i.e. not weak or convenience). * * @hide */ public boolean isStrongBiometric() { return mIsStrongBiometric; } } /** * Callback structure provided to {@link FaceManager#authenticate(CryptoObject, * CancellationSignal, int, AuthenticationCallback, Handler)}. Users of {@link * FaceManager#authenticate(CryptoObject, CancellationSignal, * int, AuthenticationCallback, Handler) } must provide an implementation of this for listening * to face events. * @hide */ public abstract static class AuthenticationCallback extends BiometricAuthenticator.AuthenticationCallback { /** * Called when an unrecoverable error has been encountered and the operation is complete. * No further callbacks will be made on this object. * * @param errorCode An integer identifying the error message * @param errString A human-readable error string that can be shown in UI */ public void onAuthenticationError(int errorCode, CharSequence errString) { } /** * Called when a recoverable error has been encountered during authentication. The help * string is provided to give the user guidance for what went wrong, such as * "Sensor dirty, please clean it." * * @param helpCode An integer identifying the error message * @param helpString A human-readable string that can be shown in UI */ public void onAuthenticationHelp(int helpCode, CharSequence helpString) { } /** * Called when a face is recognized. * * @param result An object containing authentication-related data */ public void onAuthenticationSucceeded(AuthenticationResult result) { } /** * Called when a face is detected but not recognized. */ public void onAuthenticationFailed() { } /** * Called when a face image has been acquired, but wasn't processed yet. * * @param acquireInfo one of FACE_ACQUIRED_* constants * @hide */ public void onAuthenticationAcquired(int acquireInfo) { } } /** * @hide */ public interface FaceDetectionCallback { void onFaceDetected(int sensorId, int userId, boolean isStrongBiometric); } /** * Callback structure provided to {@link FaceManager#enroll(long, * EnrollmentCallback, CancellationSignal, int). Users of {@link #FaceAuthenticationManager()} * must provide an implementation of this to {@link FaceManager#enroll(long, * CancellationSignal, int, EnrollmentCallback) for listening to face enrollment events. * * @hide */ public abstract static class EnrollmentCallback { /** * Called when an unrecoverable error has been encountered and the operation is complete. * No further callbacks will be made on this object. * * @param errMsgId An integer identifying the error message * @param errString A human-readable error string that can be shown in UI */ public void onEnrollmentError(int errMsgId, CharSequence errString) { } /** * Called when a recoverable error has been encountered during enrollment. The help * string is provided to give the user guidance for what went wrong, such as * "Image too dark, uncover light source" or what they need to do next, such as * "Rotate face up / down." * * @param helpMsgId An integer identifying the error message * @param helpString A human-readable string that can be shown in UI */ public void onEnrollmentHelp(int helpMsgId, CharSequence helpString) { } /** * Called each time a single frame is captured during enrollment. * *

For older, non-AIDL implementations, only {@code helpCode} and {@code helpMessage} are * supported. Sensible default values will be provided for all other arguments. * * @param helpCode An integer identifying the capture status for this frame. * @param helpMessage A human-readable help string that can be shown in UI. * @param cell The cell captured during this frame of enrollment, if any. * @param stage An integer representing the current stage of enrollment. * @param pan The horizontal pan of the detected face. Values in the range [-1, 1] * indicate a good capture. * @param tilt The vertical tilt of the detected face. Values in the range [-1, 1] * indicate a good capture. * @param distance The distance of the detected face from the device. Values in * the range [-1, 1] indicate a good capture. */ public void onEnrollmentFrame( int helpCode, @Nullable CharSequence helpMessage, @Nullable FaceEnrollCell cell, @FaceEnrollStages.FaceEnrollStage int stage, float pan, float tilt, float distance) { onEnrollmentHelp(helpCode, helpMessage); } /** * Called as each enrollment step progresses. Enrollment is considered complete when * remaining reaches 0. This function will not be called if enrollment fails. See * {@link EnrollmentCallback#onEnrollmentError(int, CharSequence)} * * @param remaining The number of remaining steps */ public void onEnrollmentProgress(int remaining) { } } /** * Callback structure provided to {@link #remove}. Users of {@link FaceManager} * may * optionally provide an implementation of this to * {@link #remove(Face, int, RemovalCallback)} for listening to face template * removal events. * * @hide */ public abstract static class RemovalCallback { /** * Called when the given face can't be removed. * * @param face The face that the call attempted to remove * @param errMsgId An associated error message id * @param errString An error message indicating why the face id can't be removed */ public void onRemovalError(Face face, int errMsgId, CharSequence errString) { } /** * Called when a given face is successfully removed. * * @param face The face template that was removed. */ public void onRemovalSucceeded(@Nullable Face face, int remaining) { } } /** * @hide */ public abstract static class LockoutResetCallback { /** * Called when lockout period expired and clients are allowed to listen for face * authentication * again. */ public void onLockoutReset(int sensorId) { } } /** * @hide */ public abstract static class SetFeatureCallback { public abstract void onCompleted(boolean success, int feature); } /** * @hide */ public abstract static class GetFeatureCallback { public abstract void onCompleted(boolean success, int[] features, boolean[] featureState); } /** * Callback structure provided to {@link #generateChallenge(int, int, * GenerateChallengeCallback)}. * * @hide */ public interface GenerateChallengeCallback { /** * Invoked when a challenge has been generated. */ void onGenerateChallengeResult(int sensorId, int userId, long challenge); } private class OnEnrollCancelListener implements OnCancelListener { private final long mAuthRequestId; private OnEnrollCancelListener(long id) { mAuthRequestId = id; } @Override public void onCancel() { Slog.d(TAG, "Cancel face enrollment requested for: " + mAuthRequestId); cancelEnrollment(mAuthRequestId); } } private class OnAuthenticationCancelListener implements OnCancelListener { private final long mAuthRequestId; OnAuthenticationCancelListener(long id) { mAuthRequestId = id; } @Override public void onCancel() { Slog.d(TAG, "Cancel face authentication requested for: " + mAuthRequestId); cancelAuthentication(mAuthRequestId); } } private class OnFaceDetectionCancelListener implements OnCancelListener { private final long mAuthRequestId; OnFaceDetectionCancelListener(long id) { mAuthRequestId = id; } @Override public void onCancel() { Slog.d(TAG, "Cancel face detect requested for: " + mAuthRequestId); cancelFaceDetect(mAuthRequestId); } } private class MyHandler extends Handler { private MyHandler(Context context) { super(context.getMainLooper()); } private MyHandler(Looper looper) { super(looper); } @Override public void handleMessage(android.os.Message msg) { Trace.beginSection("FaceManager#handleMessage: " + Integer.toString(msg.what)); switch (msg.what) { case MSG_ENROLL_RESULT: sendEnrollResult((Face) msg.obj, msg.arg1 /* remaining */); break; case MSG_ACQUIRED: sendAcquiredResult(msg.arg1 /* acquire info */, msg.arg2 /* vendorCode */); break; case MSG_AUTHENTICATION_SUCCEEDED: sendAuthenticatedSucceeded((Face) msg.obj, msg.arg1 /* userId */, msg.arg2 == 1 /* isStrongBiometric */); break; case MSG_AUTHENTICATION_FAILED: sendAuthenticatedFailed(); break; case MSG_ERROR: sendErrorResult(msg.arg1 /* errMsgId */, msg.arg2 /* vendorCode */); break; case MSG_REMOVED: sendRemovedResult((Face) msg.obj, msg.arg1 /* remaining */); break; case MSG_SET_FEATURE_COMPLETED: sendSetFeatureCompleted((boolean) msg.obj /* success */, msg.arg1 /* feature */); break; case MSG_GET_FEATURE_COMPLETED: SomeArgs args = (SomeArgs) msg.obj; sendGetFeatureCompleted((boolean) args.arg1 /* success */, (int[]) args.arg2 /* features */, (boolean[]) args.arg3 /* featureState */); args.recycle(); break; case MSG_CHALLENGE_GENERATED: sendChallengeGenerated(msg.arg1 /* sensorId */, msg.arg2 /* userId */, (long) msg.obj /* challenge */); break; case MSG_FACE_DETECTED: sendFaceDetected(msg.arg1 /* sensorId */, msg.arg2 /* userId */, (boolean) msg.obj /* isStrongBiometric */); break; case MSG_AUTHENTICATION_FRAME: sendAuthenticationFrame((FaceAuthenticationFrame) msg.obj /* frame */); break; case MSG_ENROLLMENT_FRAME: sendEnrollmentFrame((FaceEnrollFrame) msg.obj /* frame */); break; default: Slog.w(TAG, "Unknown message: " + msg.what); } Trace.endSection(); } } private void sendSetFeatureCompleted(boolean success, int feature) { if (mSetFeatureCallback == null) { return; } mSetFeatureCallback.onCompleted(success, feature); } private void sendGetFeatureCompleted(boolean success, int[] features, boolean[] featureState) { if (mGetFeatureCallback == null) { return; } mGetFeatureCallback.onCompleted(success, features, featureState); } private void sendChallengeGenerated(int sensorId, int userId, long challenge) { if (mGenerateChallengeCallback == null) { return; } mGenerateChallengeCallback.onGenerateChallengeResult(sensorId, userId, challenge); } private void sendFaceDetected(int sensorId, int userId, boolean isStrongBiometric) { if (mFaceDetectionCallback == null) { Slog.e(TAG, "sendFaceDetected, callback null"); return; } mFaceDetectionCallback.onFaceDetected(sensorId, userId, isStrongBiometric); } private void sendRemovedResult(Face face, int remaining) { if (mRemovalCallback == null) { return; } mRemovalCallback.onRemovalSucceeded(face, remaining); } private void sendErrorResult(int errMsgId, int vendorCode) { // emulate HAL 2.1 behavior and send real errMsgId final int clientErrMsgId = errMsgId == FACE_ERROR_VENDOR ? (vendorCode + FACE_ERROR_VENDOR_BASE) : errMsgId; if (mEnrollmentCallback != null) { mEnrollmentCallback.onEnrollmentError(clientErrMsgId, getErrorString(mContext, errMsgId, vendorCode)); } else if (mAuthenticationCallback != null) { mAuthenticationCallback.onAuthenticationError(clientErrMsgId, getErrorString(mContext, errMsgId, vendorCode)); } else if (mRemovalCallback != null) { mRemovalCallback.onRemovalError(mRemovalFace, clientErrMsgId, getErrorString(mContext, errMsgId, vendorCode)); } } private void sendEnrollResult(Face face, int remaining) { if (mEnrollmentCallback != null) { mEnrollmentCallback.onEnrollmentProgress(remaining); } } private void sendAuthenticatedSucceeded(Face face, int userId, boolean isStrongBiometric) { if (mAuthenticationCallback != null) { final AuthenticationResult result = new AuthenticationResult(mCryptoObject, face, userId, isStrongBiometric); mAuthenticationCallback.onAuthenticationSucceeded(result); } } private void sendAuthenticatedFailed() { if (mAuthenticationCallback != null) { mAuthenticationCallback.onAuthenticationFailed(); } } private void sendAcquiredResult(int acquireInfo, int vendorCode) { if (mAuthenticationCallback != null) { final FaceAuthenticationFrame frame = new FaceAuthenticationFrame( new FaceDataFrame(acquireInfo, vendorCode)); sendAuthenticationFrame(frame); } else if (mEnrollmentCallback != null) { final FaceEnrollFrame frame = new FaceEnrollFrame( null /* cell */, FaceEnrollStages.UNKNOWN, new FaceDataFrame(acquireInfo, vendorCode)); sendEnrollmentFrame(frame); } } private void sendAuthenticationFrame(@Nullable FaceAuthenticationFrame frame) { if (frame == null) { Slog.w(TAG, "Received null authentication frame"); } else if (mAuthenticationCallback != null) { // TODO(b/178414967): Send additional frame data to callback final int acquireInfo = frame.getData().getAcquiredInfo(); final int vendorCode = frame.getData().getVendorCode(); final int helpCode = getHelpCode(acquireInfo, vendorCode); final String helpMessage = getAuthHelpMessage(mContext, acquireInfo, vendorCode); mAuthenticationCallback.onAuthenticationAcquired(acquireInfo); // Ensure that only non-null help messages are sent. if (helpMessage != null) { mAuthenticationCallback.onAuthenticationHelp(helpCode, helpMessage); } } } private void sendEnrollmentFrame(@Nullable FaceEnrollFrame frame) { if (frame == null) { Slog.w(TAG, "Received null enrollment frame"); } else if (mEnrollmentCallback != null) { final FaceDataFrame data = frame.getData(); final int acquireInfo = data.getAcquiredInfo(); final int vendorCode = data.getVendorCode(); final int helpCode = getHelpCode(acquireInfo, vendorCode); final String helpMessage = getEnrollHelpMessage(mContext, acquireInfo, vendorCode); mEnrollmentCallback.onEnrollmentFrame( helpCode, helpMessage, frame.getCell(), frame.getStage(), data.getPan(), data.getTilt(), data.getDistance()); } } private static int getHelpCode(int acquireInfo, int vendorCode) { return acquireInfo == FACE_ACQUIRED_VENDOR ? vendorCode + FACE_ACQUIRED_VENDOR_BASE : acquireInfo; } /** * @hide */ @Nullable public static String getAuthHelpMessage(Context context, int acquireInfo, int vendorCode) { switch (acquireInfo) { // No help message is needed for a good capture. case FACE_ACQUIRED_GOOD: case FACE_ACQUIRED_START: return null; // Consolidate positional feedback to reduce noise during authentication. case FACE_ACQUIRED_NOT_DETECTED: return context.getString(R.string.face_acquired_not_detected); case FACE_ACQUIRED_TOO_CLOSE: return context.getString(R.string.face_acquired_too_close); case FACE_ACQUIRED_TOO_FAR: return context.getString(R.string.face_acquired_too_far); case FACE_ACQUIRED_TOO_HIGH: // TODO(b/181269243) Change back once error codes are fixed. return context.getString(R.string.face_acquired_too_low); case FACE_ACQUIRED_TOO_LOW: // TODO(b/181269243) Change back once error codes are fixed. return context.getString(R.string.face_acquired_too_high); case FACE_ACQUIRED_TOO_RIGHT: // TODO(b/181269243) Change back once error codes are fixed. return context.getString(R.string.face_acquired_too_left); case FACE_ACQUIRED_TOO_LEFT: // TODO(b/181269243) Change back once error codes are fixed. return context.getString(R.string.face_acquired_too_right); case FACE_ACQUIRED_POOR_GAZE: return context.getString(R.string.face_acquired_poor_gaze); case FACE_ACQUIRED_PAN_TOO_EXTREME: return context.getString(R.string.face_acquired_pan_too_extreme); case FACE_ACQUIRED_TILT_TOO_EXTREME: return context.getString(R.string.face_acquired_tilt_too_extreme); case FACE_ACQUIRED_ROLL_TOO_EXTREME: return context.getString(R.string.face_acquired_roll_too_extreme); case FACE_ACQUIRED_INSUFFICIENT: return context.getString(R.string.face_acquired_insufficient); case FACE_ACQUIRED_TOO_BRIGHT: return context.getString(R.string.face_acquired_too_bright); case FACE_ACQUIRED_TOO_DARK: return context.getString(R.string.face_acquired_too_dark); case FACE_ACQUIRED_TOO_MUCH_MOTION: return context.getString(R.string.face_acquired_too_much_motion); case FACE_ACQUIRED_RECALIBRATE: return context.getString(R.string.face_acquired_recalibrate); case FACE_ACQUIRED_TOO_DIFFERENT: return context.getString(R.string.face_acquired_too_different); case FACE_ACQUIRED_TOO_SIMILAR: return context.getString(R.string.face_acquired_too_similar); case FACE_ACQUIRED_FACE_OBSCURED: return context.getString(R.string.face_acquired_obscured); case FACE_ACQUIRED_SENSOR_DIRTY: return context.getString(R.string.face_acquired_sensor_dirty); case FACE_ACQUIRED_DARK_GLASSES_DETECTED: return context.getString(R.string.face_acquired_dark_glasses_detected); case FACE_ACQUIRED_MOUTH_COVERING_DETECTED: return context.getString(R.string.face_acquired_mouth_covering_detected); // Find and return the appropriate vendor-specific message. case FACE_ACQUIRED_VENDOR: { String[] msgArray = context.getResources().getStringArray( R.array.face_acquired_vendor); if (vendorCode < msgArray.length) { return msgArray[vendorCode]; } } } Slog.w(TAG, "Unknown authentication acquired message: " + acquireInfo + ", " + vendorCode); return null; } /** * @hide */ @Nullable public static String getEnrollHelpMessage(Context context, int acquireInfo, int vendorCode) { switch (acquireInfo) { case FACE_ACQUIRED_GOOD: case FACE_ACQUIRED_START: return null; case FACE_ACQUIRED_INSUFFICIENT: return context.getString(R.string.face_acquired_insufficient); case FACE_ACQUIRED_TOO_BRIGHT: return context.getString(R.string.face_acquired_too_bright); case FACE_ACQUIRED_TOO_DARK: return context.getString(R.string.face_acquired_too_dark); case FACE_ACQUIRED_TOO_CLOSE: return context.getString(R.string.face_acquired_too_close); case FACE_ACQUIRED_TOO_FAR: return context.getString(R.string.face_acquired_too_far); case FACE_ACQUIRED_TOO_HIGH: // TODO(b/181269243): Change back once error codes are fixed. return context.getString(R.string.face_acquired_too_low); case FACE_ACQUIRED_TOO_LOW: // TODO(b/181269243) Change back once error codes are fixed. return context.getString(R.string.face_acquired_too_high); case FACE_ACQUIRED_TOO_RIGHT: // TODO(b/181269243) Change back once error codes are fixed. return context.getString(R.string.face_acquired_too_left); case FACE_ACQUIRED_TOO_LEFT: // TODO(b/181269243) Change back once error codes are fixed. return context.getString(R.string.face_acquired_too_right); case FACE_ACQUIRED_POOR_GAZE: return context.getString(R.string.face_acquired_poor_gaze); case FACE_ACQUIRED_NOT_DETECTED: return context.getString(R.string.face_acquired_not_detected); case FACE_ACQUIRED_TOO_MUCH_MOTION: return context.getString(R.string.face_acquired_too_much_motion); case FACE_ACQUIRED_RECALIBRATE: return context.getString(R.string.face_acquired_recalibrate); case FACE_ACQUIRED_TOO_DIFFERENT: return context.getString(R.string.face_acquired_too_different); case FACE_ACQUIRED_TOO_SIMILAR: return context.getString(R.string.face_acquired_too_similar); case FACE_ACQUIRED_PAN_TOO_EXTREME: return context.getString(R.string.face_acquired_pan_too_extreme); case FACE_ACQUIRED_TILT_TOO_EXTREME: return context.getString(R.string.face_acquired_tilt_too_extreme); case FACE_ACQUIRED_ROLL_TOO_EXTREME: return context.getString(R.string.face_acquired_roll_too_extreme); case FACE_ACQUIRED_FACE_OBSCURED: return context.getString(R.string.face_acquired_obscured); case FACE_ACQUIRED_SENSOR_DIRTY: return context.getString(R.string.face_acquired_sensor_dirty); case FACE_ACQUIRED_DARK_GLASSES_DETECTED: return context.getString(R.string.face_acquired_dark_glasses_detected); case FACE_ACQUIRED_MOUTH_COVERING_DETECTED: return context.getString(R.string.face_acquired_mouth_covering_detected); case FACE_ACQUIRED_VENDOR: { String[] msgArray = context.getResources().getStringArray( R.array.face_acquired_vendor); if (vendorCode < msgArray.length) { return msgArray[vendorCode]; } } } Slog.w(TAG, "Unknown enrollment acquired message: " + acquireInfo + ", " + vendorCode); return null; } }