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      1 /*
      2  * Copyright (C) 2015 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;
     18 
     19 import android.app.Fragment;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.os.AsyncTask;
     23 import android.os.Bundle;
     24 import android.os.UserManager;
     25 
     26 import com.android.internal.widget.LockPatternUtils;
     27 
     28 /**
     29  * An invisible retained worker fragment to track the AsyncWork that saves (and optionally
     30  * verifies if a challenge is given) the chosen lock credential (pattern/pin/password).
     31  */
     32 abstract class SaveChosenLockWorkerBase extends Fragment {
     33 
     34     private Listener mListener;
     35     private boolean mFinished;
     36     private Intent mResultData;
     37 
     38     protected LockPatternUtils mUtils;
     39     protected boolean mHasChallenge;
     40     protected long mChallenge;
     41     protected boolean mWasSecureBefore;
     42     protected int mUserId;
     43 
     44     private boolean mBlocking;
     45 
     46     @Override
     47     public void onCreate(Bundle savedInstanceState) {
     48         super.onCreate(savedInstanceState);
     49         setRetainInstance(true);
     50     }
     51 
     52     public void setListener(Listener listener) {
     53         if (mListener == listener) {
     54             return;
     55         }
     56 
     57         mListener = listener;
     58         if (mFinished && mListener != null) {
     59             mListener.onChosenLockSaveFinished(mWasSecureBefore, mResultData);
     60         }
     61     }
     62 
     63     protected void prepare(LockPatternUtils utils, boolean credentialRequired,
     64             boolean hasChallenge, long challenge, int userId) {
     65         mUtils = utils;
     66         mUserId = userId;
     67 
     68         mHasChallenge = hasChallenge;
     69         mChallenge = challenge;
     70         // This will be a no-op for non managed profiles.
     71         mWasSecureBefore = mUtils.isSecure(mUserId);
     72 
     73         Context context = getContext();
     74         // If context is null, we're being invoked to change the setCredentialRequiredToDecrypt,
     75         // and we made sure that this is the primary user already.
     76         if (context == null || UserManager.get(context).getUserInfo(mUserId).isPrimary()) {
     77             mUtils.setCredentialRequiredToDecrypt(credentialRequired);
     78         }
     79 
     80         mFinished = false;
     81         mResultData = null;
     82     }
     83 
     84     protected void start() {
     85         if (mBlocking) {
     86             finish(saveAndVerifyInBackground());
     87         } else {
     88             new Task().execute();
     89         }
     90     }
     91 
     92     /**
     93      * Executes the save and verify work in background.
     94      * @return Intent with challenge token or null.
     95      */
     96     protected abstract Intent saveAndVerifyInBackground();
     97 
     98     protected void finish(Intent resultData) {
     99         mFinished = true;
    100         mResultData = resultData;
    101         if (mListener != null) {
    102             mListener.onChosenLockSaveFinished(mWasSecureBefore, mResultData);
    103         }
    104     }
    105 
    106     public void setBlocking(boolean blocking) {
    107         mBlocking = blocking;
    108     }
    109 
    110     private class Task extends AsyncTask<Void, Void, Intent> {
    111         @Override
    112         protected Intent doInBackground(Void... params){
    113             return saveAndVerifyInBackground();
    114         }
    115 
    116         @Override
    117         protected void onPostExecute(Intent resultData) {
    118             finish(resultData);
    119         }
    120     }
    121 
    122     interface Listener {
    123         public void onChosenLockSaveFinished(boolean wasSecureBefore, Intent resultData);
    124     }
    125 }
    126