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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 package com.android.bluetooth.opp;
     17 
     18 import android.content.BroadcastReceiver;
     19 import android.content.Context;
     20 import android.content.Intent;
     21 import android.content.IntentFilter;
     22 import android.content.pm.ProviderInfo;
     23 import android.net.Uri;
     24 import android.os.UserHandle;
     25 import android.os.UserManager;
     26 import android.support.v4.content.FileProvider;
     27 import android.util.Log;
     28 
     29 import java.io.File;
     30 
     31 /**
     32  * A FileProvider for files received by Bluetooth share
     33  */
     34 public class BluetoothOppFileProvider extends FileProvider {
     35     private static final String TAG = "BluetoothOppFileProvider";
     36 
     37     private Context mContext = null;
     38     private ProviderInfo mProviderInfo = null;
     39     private boolean mRegisteredReceiver = false;
     40     private boolean mInitialized = false;
     41 
     42     /** Broadcast receiver that attach FileProvider info when user unlocks the phone for the
     43      *  first time after reboot and the credential-encrypted storage is available.
     44      */
     45     private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
     46         @Override
     47         public void onReceive(final Context context, Intent intent) {
     48             if (Intent.ACTION_USER_UNLOCKED.equals(intent.getAction())) {
     49                 attachInfo(mContext, mProviderInfo);
     50             }
     51         }
     52     };
     53 
     54     /**
     55      * After the FileProvider is instantiated, this method is called to provide the system with
     56      * information about the provider. The actual initialization is delayed until user unlock the
     57      * device
     58      *
     59      * @param context A {@link Context} for the current component.
     60      * @param info A {@link ProviderInfo} for the new provider.
     61      */
     62     @Override
     63     public void attachInfo(Context context, ProviderInfo info) {
     64         synchronized (this) {
     65             mContext = context;
     66             mProviderInfo = info;
     67             if (!mRegisteredReceiver) {
     68                 IntentFilter userFilter = new IntentFilter();
     69                 userFilter.addAction(Intent.ACTION_USER_UNLOCKED);
     70                 mContext.registerReceiverAsUser(mBroadcastReceiver, UserHandle.CURRENT, userFilter,
     71                         null, null);
     72                 mRegisteredReceiver = true;
     73             }
     74             UserManager userManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
     75             if (userManager.isUserUnlocked()) {
     76                 if (!mInitialized) {
     77                     if (Constants.DEBUG) {
     78                         Log.d(TAG, "Initialized");
     79                     }
     80                     super.attachInfo(mContext, mProviderInfo);
     81                     mInitialized = true;
     82                 }
     83                 if (mRegisteredReceiver) {
     84                     mContext.unregisterReceiver(mBroadcastReceiver);
     85                     mRegisteredReceiver = false;
     86                 }
     87             }
     88         }
     89     }
     90 
     91     /**
     92      * Return a content URI for a given {@link File}. Specific temporary
     93      * permissions for the content URI can be set with
     94      * {@link Context#grantUriPermission(String, Uri, int)}, or added
     95      * to an {@link Intent} by calling {@link Intent#setData(Uri) setData()} and then
     96      * {@link Intent#setFlags(int) setFlags()}; in both cases, the applicable flags are
     97      * {@link Intent#FLAG_GRANT_READ_URI_PERMISSION} and
     98      * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION}. A FileProvider can only return a
     99      * <code>content</code> {@link Uri} for file paths defined in their <code>&lt;paths&gt;</code>
    100      * meta-data element. See the Class Overview for more information.
    101      *
    102      * @param context A {@link Context} for the current component.
    103      * @param authority The authority of a {@link FileProvider} defined in a
    104      *            {@code <provider>} element in your app's manifest.
    105      * @param file A {@link File} pointing to the filename for which you want a
    106      * <code>content</code> {@link Uri}.
    107      * @return A content URI for the file. Null if the user hasn't unlock the phone
    108      * @throws IllegalArgumentException When the given {@link File} is outside
    109      * the paths supported by the provider.
    110      */
    111     public static Uri getUriForFile(Context context, String authority, File file) {
    112         UserManager userManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
    113         if (!userManager.isUserUnlocked()) {
    114             return null;
    115         }
    116         context = context.createCredentialProtectedStorageContext();
    117         return FileProvider.getUriForFile(context, authority, file);
    118     }
    119 }
    120