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      1 /*
      2  * Copyright (C) 2017 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.server.fingerprint;
     18 
     19 import android.content.Context;
     20 import android.hardware.fingerprint.Fingerprint;
     21 import android.hardware.fingerprint.IFingerprintServiceReceiver;
     22 import android.os.IBinder;
     23 import android.util.Slog;
     24 import java.util.ArrayList;
     25 import java.util.List;
     26 
     27 /**
     28  * An internal class to help clean up unknown fingerprints in the hardware and software
     29  */
     30 public abstract class InternalEnumerateClient extends EnumerateClient {
     31 
     32     private List<Fingerprint> mEnrolledList;
     33     private List<Fingerprint> mEnumeratedList = new ArrayList<>(); // list of fp to delete
     34 
     35     public InternalEnumerateClient(Context context, long halDeviceId, IBinder token,
     36             IFingerprintServiceReceiver receiver, int groupId, int userId,
     37             boolean restricted, String owner, List<Fingerprint> enrolledList) {
     38 
     39         super(context, halDeviceId, token, receiver, userId, groupId, restricted, owner);
     40         mEnrolledList = enrolledList;
     41     }
     42 
     43     private void handleEnumeratedFingerprint(int fingerId, int groupId, int remaining) {
     44 
     45         boolean matched = false;
     46         for (int i=0; i<mEnrolledList.size(); i++) {
     47             if (mEnrolledList.get(i).getFingerId() == fingerId) {
     48                 mEnrolledList.remove(i);
     49                 matched = true;
     50                 Slog.e(TAG, "Matched fingerprint fid=" + fingerId);
     51                 break;
     52             }
     53         }
     54 
     55         // fingerId 0 means no fingerprints are in hardware
     56         if (!matched && fingerId != 0) {
     57             Fingerprint fingerprint = new Fingerprint("", groupId, fingerId, getHalDeviceId());
     58             mEnumeratedList.add(fingerprint);
     59         }
     60     }
     61 
     62     private void doFingerprintCleanup() {
     63 
     64         if (mEnrolledList == null) {
     65             return;
     66         }
     67 
     68         for (Fingerprint f : mEnrolledList) {
     69             Slog.e(TAG, "Internal Enumerate: Removing dangling enrolled fingerprint: "
     70                     + f.getName() + " " + f.getFingerId() + " " + f.getGroupId()
     71                     + " " + f.getDeviceId());
     72 
     73             FingerprintUtils.getInstance().removeFingerprintIdForUser(getContext(),
     74                     f.getFingerId(), getTargetUserId());
     75         }
     76         mEnrolledList.clear();
     77     }
     78 
     79     public List<Fingerprint> getEnumeratedList() {
     80         return mEnumeratedList;
     81     }
     82 
     83     @Override
     84     public boolean onEnumerationResult(int fingerId, int groupId, int remaining) {
     85 
     86         handleEnumeratedFingerprint(fingerId, groupId, remaining);
     87         if (remaining == 0) {
     88             doFingerprintCleanup();
     89         }
     90 
     91         return remaining == 0;
     92     }
     93 
     94 }
     95