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.internal.widget;
  
  
  /**
   * LockSettingsService local system service interface.
   *
   * @hide Only for use within the system server.
   */
  public abstract class LockSettingsInternal {
  
      /**
       * Create an escrow token for the current user, which can later be used to unlock FBE
       * or change user password.
       *
       * After adding, if the user currently has lockscreen password, he will need to perform a
       * confirm credential operation in order to activate the token for future use.
       * Once the token is activated, the callback that is passed here is called.   If the user
       * has no secure lockscreen, then the token is activated immediately.
       *
       * @return a unique 64-bit token handle which is needed to refer to this token later.
       */
      public abstract long addEscrowToken(byte[] token, int userId,
              LockPatternUtils.EscrowTokenStateChangeCallback callback);
  
      /**
       * Remove an escrow token.
       *
       * @return true if the given handle refers to a valid token previously returned from
       * {@link #addEscrowToken}, whether it's active or not. return false otherwise.
       */
      public abstract boolean removeEscrowToken(long handle, int userId);
  
      /**
       * Check if the given escrow token is active or not. Only active token can be used to call
       * {@link #setLockCredentialWithToken} and {@link #unlockUserWithToken}
       */
      public abstract boolean isEscrowTokenActive(long handle, int userId);
  
      /**
       * Set the lock credential.
       *
       * @return true if password is set.
       */
      public abstract boolean setLockCredentialWithToken(byte[] credential, int type,
              long tokenHandle, byte[] token, int requestedQuality, int userId);
  
      public abstract boolean unlockUserWithToken(long tokenHandle, byte[] token, int userId);
  }
  