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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.packageinstaller;
     18 
     19 import android.content.BroadcastReceiver;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.os.SystemClock;
     23 import android.support.annotation.NonNull;
     24 import android.util.Log;
     25 
     26 import java.io.File;
     27 import java.io.IOException;
     28 
     29 /**
     30  * Manages files of the package installer and resets state during boot.
     31  */
     32 public class TemporaryFileManager extends BroadcastReceiver {
     33     private static final String LOG_TAG = TemporaryFileManager.class.getSimpleName();
     34 
     35     /**
     36      * Create a new file to hold a staged file.
     37      *
     38      * @param context The context of the caller
     39      *
     40      * @return A new file
     41      */
     42     @NonNull
     43     public static File getStagedFile(@NonNull Context context) throws IOException {
     44         return File.createTempFile("package", ".apk", context.getNoBackupFilesDir());
     45     }
     46 
     47     /**
     48      * Get the file used to store the results of installs.
     49      *
     50      * @param context The context of the caller
     51      *
     52      * @return the file used to store the results of installs
     53      */
     54     @NonNull
     55     public static File getInstallStateFile(@NonNull Context context) {
     56         return new File(context.getNoBackupFilesDir(), "install_results.xml");
     57     }
     58 
     59     /**
     60      * Get the file used to store the results of uninstalls.
     61      *
     62      * @param context The context of the caller
     63      *
     64      * @return the file used to store the results of uninstalls
     65      */
     66     @NonNull
     67     public static File getUninstallStateFile(@NonNull Context context) {
     68         return new File(context.getNoBackupFilesDir(), "uninstall_results.xml");
     69     }
     70 
     71     @Override
     72     public void onReceive(Context context, Intent intent) {
     73         long systemBootTime = System.currentTimeMillis() - SystemClock.elapsedRealtime();
     74 
     75         File[] filesOnBoot = context.getNoBackupFilesDir().listFiles();
     76 
     77         if (filesOnBoot == null) {
     78             return;
     79         }
     80 
     81         for (int i = 0; i < filesOnBoot.length; i++) {
     82             File fileOnBoot = filesOnBoot[i];
     83 
     84             if (systemBootTime > fileOnBoot.lastModified()) {
     85                 boolean wasDeleted = fileOnBoot.delete();
     86                 if (!wasDeleted) {
     87                     Log.w(LOG_TAG, "Could not delete " + fileOnBoot.getName() + " onBoot");
     88                 }
     89             } else {
     90                 Log.w(LOG_TAG, fileOnBoot.getName() + " was created before onBoot broadcast was "
     91                         + "received");
     92             }
     93         }
     94     }
     95 }
     96