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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.settings.fingerprint;
     18 
     19 import android.hardware.fingerprint.FingerprintManager;
     20 import android.hardware.fingerprint.FingerprintManager.AuthenticationResult;
     21 import android.os.CancellationSignal;
     22 
     23 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
     24 import com.android.settings.core.InstrumentedFragment;
     25 
     26 /**
     27  * Sidecar fragment to handle the state around fingerprint authentication
     28  */
     29 public class FingerprintAuthenticateSidecar extends InstrumentedFragment {
     30 
     31     private static final String TAG = "FingerprintAuthenticateSidecar";
     32 
     33     private FingerprintManager mFingerprintManager;
     34     private Listener mListener;
     35     private AuthenticationResult mAuthenticationResult;
     36     private CancellationSignal mCancellationSignal;
     37     private AuthenticationError mAuthenticationError;
     38 
     39     public interface Listener {
     40         void onAuthenticationSucceeded(AuthenticationResult result);
     41         void onAuthenticationFailed();
     42         void onAuthenticationError(int errMsgId, CharSequence errString);
     43         void onAuthenticationHelp(int helpMsgId, CharSequence helpString);
     44     }
     45 
     46     private class AuthenticationError {
     47         int error;
     48         CharSequence errorString;
     49 
     50         public AuthenticationError(int errMsgId, CharSequence errString) {
     51             error = errMsgId;
     52             errorString = errString;
     53         }
     54     }
     55 
     56     @Override
     57     public int getMetricsCategory() {
     58         return MetricsEvent.FINGERPRINT_AUTHENTICATE_SIDECAR;
     59     }
     60 
     61     private FingerprintManager.AuthenticationCallback mAuthenticationCallback =
     62             new FingerprintManager.AuthenticationCallback() {
     63                 @Override
     64                 public void onAuthenticationSucceeded(AuthenticationResult result) {
     65                     mCancellationSignal = null;
     66                     if (mListener != null) {
     67                         mListener.onAuthenticationSucceeded(result);
     68                     } else {
     69                         mAuthenticationResult = result;
     70                         mAuthenticationError = null;
     71                     }
     72                 }
     73 
     74                 @Override
     75                 public void onAuthenticationFailed() {
     76                     if (mListener != null) {
     77                         mListener.onAuthenticationFailed();
     78                     }
     79                 }
     80 
     81                 @Override
     82                 public void onAuthenticationError(int errMsgId, CharSequence errString) {
     83                     mCancellationSignal = null;
     84                     if (mListener != null) {
     85                         mListener.onAuthenticationError(errMsgId, errString);
     86                     } else {
     87                         mAuthenticationError = new AuthenticationError(errMsgId, errString);
     88                         mAuthenticationResult = null;
     89                     }
     90                 }
     91 
     92                 @Override
     93                 public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
     94                     if (mListener != null) {
     95                         mListener.onAuthenticationHelp(helpMsgId, helpString);
     96                     }
     97                 }
     98     };
     99 
    100     public void setFingerprintManager(FingerprintManager fingerprintManager) {
    101         mFingerprintManager = fingerprintManager;
    102     }
    103 
    104     public void startAuthentication(int userId) {
    105         mCancellationSignal = new CancellationSignal();
    106         mFingerprintManager.authenticate(null, mCancellationSignal, 0 /* flags */,
    107                 mAuthenticationCallback, null, userId);
    108     }
    109 
    110     public void stopAuthentication() {
    111         if (mCancellationSignal != null && !mCancellationSignal.isCanceled()) {
    112             mCancellationSignal.cancel();
    113         }
    114         mCancellationSignal = null;
    115     }
    116 
    117     public void setListener(Listener listener) {
    118         if (mListener == null && listener != null) {
    119             if (mAuthenticationResult != null) {
    120                 listener.onAuthenticationSucceeded(mAuthenticationResult);
    121                 mAuthenticationResult = null;
    122             }
    123             if (mAuthenticationError != null &&
    124                     mAuthenticationError.error != FingerprintManager.FINGERPRINT_ERROR_CANCELED) {
    125                 listener.onAuthenticationError(mAuthenticationError.error,
    126                         mAuthenticationError.errorString);
    127                 mAuthenticationError = null;
    128             }
    129         }
    130         mListener = listener;
    131     }
    132 }