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.util.Log; 27 28 import androidx.core.content.FileProvider; 29 30 import java.io.File; 31 32 /** 33 * A FileProvider for files received by Bluetooth share 34 */ 35 public class BluetoothOppFileProvider extends FileProvider { 36 private static final String TAG = "BluetoothOppFileProvider"; 37 38 private Context mContext = null; 39 private ProviderInfo mProviderInfo = null; 40 private boolean mRegisteredReceiver = false; 41 private boolean mInitialized = false; 42 43 /** Broadcast receiver that attach FileProvider info when user unlocks the phone for the 44 * first time after reboot and the credential-encrypted storage is available. 45 */ 46 private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() { 47 @Override 48 public void onReceive(final Context context, Intent intent) { 49 if (Intent.ACTION_USER_UNLOCKED.equals(intent.getAction())) { 50 attachInfo(mContext, mProviderInfo); 51 } 52 } 53 }; 54 55 /** 56 * After the FileProvider is instantiated, this method is called to provide the system with 57 * information about the provider. The actual initialization is delayed until user unlock the 58 * device 59 * 60 * @param context A {@link Context} for the current component. 61 * @param info A {@link ProviderInfo} for the new provider. 62 */ 63 @Override attachInfo(Context context, ProviderInfo info)64 public void attachInfo(Context context, ProviderInfo info) { 65 synchronized (this) { 66 mContext = context; 67 mProviderInfo = info; 68 if (!mRegisteredReceiver) { 69 IntentFilter userFilter = new IntentFilter(); 70 userFilter.addAction(Intent.ACTION_USER_UNLOCKED); 71 mContext.registerReceiverAsUser(mBroadcastReceiver, UserHandle.CURRENT, userFilter, 72 null, null); 73 mRegisteredReceiver = true; 74 } 75 UserManager userManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE); 76 if (userManager.isUserUnlocked()) { 77 if (!mInitialized) { 78 if (Constants.DEBUG) { 79 Log.d(TAG, "Initialized"); 80 } 81 super.attachInfo(mContext, mProviderInfo); 82 mInitialized = true; 83 } 84 if (mRegisteredReceiver) { 85 mContext.unregisterReceiver(mBroadcastReceiver); 86 mRegisteredReceiver = false; 87 } 88 } 89 } 90 } 91 92 /** 93 * Return a content URI for a given {@link File}. Specific temporary 94 * permissions for the content URI can be set with 95 * {@link Context#grantUriPermission(String, Uri, int)}, or added 96 * to an {@link Intent} by calling {@link Intent#setData(Uri) setData()} and then 97 * {@link Intent#setFlags(int) setFlags()}; in both cases, the applicable flags are 98 * {@link Intent#FLAG_GRANT_READ_URI_PERMISSION} and 99 * {@link Intent#FLAG_GRANT_WRITE_URI_PERMISSION}. A FileProvider can only return a 100 * <code>content</code> {@link Uri} for file paths defined in their <code><paths></code> 101 * meta-data element. See the Class Overview for more information. 102 * 103 * @param context A {@link Context} for the current component. 104 * @param authority The authority of a {@link FileProvider} defined in a 105 * {@code <provider>} element in your app's manifest. 106 * @param file A {@link File} pointing to the filename for which you want a 107 * <code>content</code> {@link Uri}. 108 * @return A content URI for the file. Null if the user hasn't unlock the phone 109 * @throws IllegalArgumentException When the given {@link File} is outside 110 * the paths supported by the provider. 111 */ getUriForFile(Context context, String authority, File file)112 public static Uri getUriForFile(Context context, String authority, File file) { 113 UserManager userManager = (UserManager) context.getSystemService(Context.USER_SERVICE); 114 if (!userManager.isUserUnlocked()) { 115 return null; 116 } 117 context = context.createCredentialProtectedStorageContext(); 118 return FileProvider.getUriForFile(context, authority, file); 119 } 120 } 121