content: /*
   * 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 com.android.server.biometrics;
  
  import android.content.Context;
  import android.hardware.biometrics.BiometricAuthenticator;
  import android.hardware.biometrics.BiometricConstants;
  import android.hardware.biometrics.BiometricsProtoEnums;
  import android.os.IBinder;
  import android.os.RemoteException;
  import android.util.Slog;
  
  import java.util.ArrayList;
  
  /**
   * A class to keep track of the remove state for a given client.
   */
  public abstract class RemovalClient extends ClientMonitor {
      private final int mBiometricId;
      private final BiometricUtils mBiometricUtils;
  
      public RemovalClient(Context context, Constants constants,
              BiometricServiceBase.DaemonWrapper daemon, long halDeviceId, IBinder token,
              BiometricServiceBase.ServiceListener listener, int biometricId, int groupId, int userId,
              boolean restricted, String owner, BiometricUtils utils) {
          super(context, constants, daemon, halDeviceId, token, listener, userId, groupId, restricted,
                  owner, 0 /* cookie */);
          mBiometricId = biometricId;
          mBiometricUtils = utils;
      }
  
      @Override
      public void notifyUserActivity() {
      }
  
      @Override
      protected int statsAction() {
          return BiometricsProtoEnums.ACTION_REMOVE;
      }
  
      @Override
      public int start() {
          // The biometric template ids will be removed when we get confirmation from the HAL
          try {
              final int result = getDaemonWrapper().remove(getGroupId(), mBiometricId);
              if (result != 0) {
                  Slog.w(getLogTag(), "startRemove with id = " + mBiometricId + " failed, result=" +
                          result);
                  mMetricsLogger.histogram(mConstants.tagRemoveStartError(), result);
                  onError(getHalDeviceId(), BiometricConstants.BIOMETRIC_ERROR_HW_UNAVAILABLE,
                          0 /* vendorCode */);
                  return result;
              }
          } catch (RemoteException e) {
              Slog.e(getLogTag(), "startRemove failed", e);
          }
          return 0;
      }
  
      @Override
      public int stop(boolean initiatedByClient) {
          if (mAlreadyCancelled) {
              Slog.w(getLogTag(), "stopRemove: already cancelled!");
              return 0;
          }
  
          try {
              final int result = getDaemonWrapper().cancel();
              if (result != 0) {
                  Slog.w(getLogTag(), "stopRemoval failed, result=" + result);
                  return result;
              }
              if (DEBUG) Slog.w(getLogTag(), "client " + getOwnerString() + " is no longer removing");
          } catch (RemoteException e) {
              Slog.e(getLogTag(), "stopRemoval failed", e);
              return ERROR_ESRCH;
          }
          mAlreadyCancelled = true;
          return 0; // success
      }
  
      /*
       * @return true if we're done.
       */
      private boolean sendRemoved(BiometricAuthenticator.Identifier identifier,
              int remaining) {
          try {
              if (getListener() != null) {
                  getListener().onRemoved(identifier, remaining);
              }
          } catch (RemoteException e) {
              Slog.w(getLogTag(), "Failed to notify Removed:", e);
          }
          return remaining == 0;
      }
  
      @Override
      public boolean onRemoved(BiometricAuthenticator.Identifier identifier, int remaining) {
          if (identifier.getBiometricId() != 0) {
              mBiometricUtils.removeBiometricForUser(getContext(), getTargetUserId(),
                      identifier.getBiometricId());
          }
          return sendRemoved(identifier, remaining);
      }
  
      @Override
      public boolean onEnrollResult(BiometricAuthenticator.Identifier identifier, int rem) {
          if (DEBUG) Slog.w(getLogTag(), "onEnrollResult() called for remove!");
          return true; // Invalid for Remove
      }
  
      @Override
      public boolean onAuthenticated(BiometricAuthenticator.Identifier identifier,
              boolean authenticated, ArrayList<Byte> token) {
          if (DEBUG) Slog.w(getLogTag(), "onAuthenticated() called for remove!");
          return true; // Invalid for Remove.
      }
  
      @Override
      public boolean onEnumerationResult(BiometricAuthenticator.Identifier identifier,
              int remaining) {
          if (DEBUG) Slog.w(getLogTag(), "onEnumerationResult() called for remove!");
          return true; // Invalid for Remove.
      }
  }
  