| /* |
| * Copyright (C) 2020 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.biometrics.sensors.face.hidl; |
| |
| import android.annotation.NonNull; |
| import android.content.Context; |
| import android.hardware.biometrics.face.V1_0.IBiometricsFace; |
| import android.hardware.face.IFaceServiceReceiver; |
| import android.os.IBinder; |
| import android.os.RemoteException; |
| import android.util.Slog; |
| |
| import com.android.internal.util.Preconditions; |
| import com.android.server.biometrics.log.BiometricContext; |
| import com.android.server.biometrics.log.BiometricLogger; |
| import com.android.server.biometrics.sensors.ClientMonitorCallback; |
| import com.android.server.biometrics.sensors.ClientMonitorCallbackConverter; |
| import com.android.server.biometrics.sensors.GenerateChallengeClient; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.function.Supplier; |
| |
| /** |
| * Face-specific generateChallenge client supporting the |
| * {@link android.hardware.biometrics.face.V1_0} HIDL interface. |
| */ |
| public class FaceGenerateChallengeClient extends GenerateChallengeClient<IBiometricsFace> { |
| |
| private static final String TAG = "FaceGenerateChallengeClient"; |
| static final int CHALLENGE_TIMEOUT_SEC = 600; // 10 minutes |
| private static final ClientMonitorCallback EMPTY_CALLBACK = new ClientMonitorCallback() { |
| }; |
| |
| private final long mCreatedAt; |
| private List<IFaceServiceReceiver> mWaiting; |
| private Long mChallengeResult; |
| |
| FaceGenerateChallengeClient(@NonNull Context context, |
| @NonNull Supplier<IBiometricsFace> lazyDaemon, @NonNull IBinder token, |
| @NonNull ClientMonitorCallbackConverter listener, int userId, @NonNull String owner, |
| int sensorId, @NonNull BiometricLogger logger, |
| @NonNull BiometricContext biometricContext, long now) { |
| super(context, lazyDaemon, token, listener, userId, owner, sensorId, logger, |
| biometricContext); |
| mCreatedAt = now; |
| mWaiting = new ArrayList<>(); |
| } |
| |
| @Override |
| protected void startHalOperation() { |
| mChallengeResult = null; |
| try { |
| mChallengeResult = getFreshDaemon().generateChallenge(CHALLENGE_TIMEOUT_SEC).value; |
| // send the result to the original caller via mCallback and any waiting callers |
| // that called reuseResult |
| sendChallengeResult(getListener(), mCallback); |
| for (IFaceServiceReceiver receiver : mWaiting) { |
| sendChallengeResult(new ClientMonitorCallbackConverter(receiver), EMPTY_CALLBACK); |
| } |
| } catch (RemoteException e) { |
| Slog.e(TAG, "generateChallenge failed", e); |
| mCallback.onClientFinished(this, false /* success */); |
| } finally { |
| mWaiting = null; |
| } |
| } |
| |
| /** @return An arbitrary time value for caching provided to the constructor. */ |
| public long getCreatedAt() { |
| return mCreatedAt; |
| } |
| |
| /** |
| * Reuse the result of this operation when it is available. The receiver will be notified |
| * immediately if a challenge has already been generated. |
| * |
| * @param receiver receiver to be notified of challenge result |
| */ |
| public void reuseResult(@NonNull IFaceServiceReceiver receiver) { |
| if (mWaiting != null) { |
| mWaiting.add(receiver); |
| } else { |
| sendChallengeResult(new ClientMonitorCallbackConverter(receiver), EMPTY_CALLBACK); |
| } |
| } |
| |
| private void sendChallengeResult(@NonNull ClientMonitorCallbackConverter receiver, |
| @NonNull ClientMonitorCallback ownerCallback) { |
| Preconditions.checkState(mChallengeResult != null, "result not available"); |
| try { |
| receiver.onChallengeGenerated(getSensorId(), getTargetUserId(), mChallengeResult); |
| ownerCallback.onClientFinished(this, true /* success */); |
| } catch (RemoteException e) { |
| Slog.e(TAG, "Remote exception", e); |
| ownerCallback.onClientFinished(this, false /* success */); |
| } |
| } |
| } |