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.example.android.nfcprovisioning; 18 19 import android.app.Activity; 20 import android.app.admin.DevicePolicyManager; 21 import android.content.Context; 22 import android.net.wifi.WifiInfo; 23 import android.net.wifi.WifiManager; 24 import android.os.Environment; 25 import android.support.v4.content.AsyncTaskLoader; 26 27 import com.example.android.common.logger.Log; 28 29 import java.io.BufferedReader; 30 import java.io.File; 31 import java.io.FileReader; 32 import java.io.IOException; 33 import java.util.HashMap; 34 import java.util.Map; 35 import java.util.TimeZone; 36 37 /** 38 * Loads default values for NFC provisioning. 39 * <p/> 40 * This loader first tries to load values from a config file in SD card. Then it fills in missing 41 * values using constants and settings on the programming device. 42 */ 43 public class ProvisioningValuesLoader extends AsyncTaskLoader<Map<String, String>> { 44 45 private static final String FILENAME = "nfcprovisioning.txt"; 46 private static final String TAG = "LoadProvisioningValuesTask"; 47 48 private Map<String, String> mValues; 49 ProvisioningValuesLoader(Context context)50 public ProvisioningValuesLoader(Context context) { 51 super(context); 52 } 53 54 @Override loadInBackground()55 public Map<String, String> loadInBackground() { 56 HashMap<String, String> values = new HashMap<>(); 57 loadFromDisk(values); 58 loadSystemValues(values); 59 return values; 60 } 61 62 @Override deliverResult(Map<String, String> values)63 public void deliverResult(Map<String, String> values) { 64 if (isReset()) { 65 return; 66 } 67 mValues = values; 68 super.deliverResult(values); 69 } 70 71 @Override onStartLoading()72 protected void onStartLoading() { 73 if (mValues != null) { 74 deliverResult(mValues); 75 } 76 if (takeContentChanged() || mValues == null) { 77 forceLoad(); 78 } 79 } 80 81 @Override onStopLoading()82 protected void onStopLoading() { 83 cancelLoad(); 84 } 85 86 @Override onReset()87 protected void onReset() { 88 super.onReset(); 89 onStopLoading(); 90 mValues = null; 91 } 92 loadFromDisk(HashMap<String, String> values)93 private void loadFromDisk(HashMap<String, String> values) { 94 File directory = Environment.getExternalStorageDirectory(); 95 File file = new File(directory, FILENAME); 96 if (!file.exists()) { 97 return; 98 } 99 Log.d(TAG, "Loading the config file..."); 100 try { 101 loadFromFile(values, file); 102 } catch (IOException e) { 103 e.printStackTrace(); 104 Log.e(TAG, "Error loading data from " + file, e); 105 } 106 } 107 loadFromFile(HashMap<String, String> values, File file)108 private void loadFromFile(HashMap<String, String> values, File file) throws IOException { 109 BufferedReader reader = null; 110 try { 111 reader = new BufferedReader(new FileReader(file)); 112 String line; 113 while (null != (line = reader.readLine())) { 114 if (line.startsWith("#")) { 115 continue; 116 } 117 int position = line.indexOf("="); 118 if (position < 0) { // Not found 119 continue; 120 } 121 String key = line.substring(0, position); 122 String value = line.substring(position + 1); 123 values.put(key, value); 124 Log.d(TAG, key + "=" + value); 125 } 126 } finally { 127 if (reader != null) { 128 reader.close(); 129 } 130 } 131 } 132 loadSystemValues(HashMap<String, String> values)133 private void loadSystemValues(HashMap<String, String> values) { 134 Context context = getContext(); 135 putIfMissing(values, DevicePolicyManager.EXTRA_PROVISIONING_DEVICE_ADMIN_PACKAGE_NAME, 136 "com.example.android.deviceowner"); 137 putIfMissing(values, DevicePolicyManager.EXTRA_PROVISIONING_LOCALE, 138 context.getResources().getConfiguration().locale.toString()); 139 putIfMissing(values, DevicePolicyManager.EXTRA_PROVISIONING_TIME_ZONE, 140 TimeZone.getDefault().getID()); 141 if (!values.containsKey(DevicePolicyManager.EXTRA_PROVISIONING_WIFI_SSID)) { 142 WifiManager wifiManager = (WifiManager) context 143 .getSystemService(Activity.WIFI_SERVICE); 144 WifiInfo info = wifiManager.getConnectionInfo(); 145 values.put(DevicePolicyManager.EXTRA_PROVISIONING_WIFI_SSID, trimSsid(info.getSSID())); 146 } 147 } 148 149 /** 150 * {@link WifiInfo#getSSID} returns the WiFi SSID surrounded by double quotation marks. This 151 * method removes them if wifiSsid contains them. 152 */ trimSsid(String wifiSsid)153 private static String trimSsid(String wifiSsid) { 154 int head = wifiSsid.startsWith("\"") ? 1 : 0; 155 int tail = wifiSsid.endsWith("\"") ? 1 : 0; 156 return wifiSsid.substring(head, wifiSsid.length() - tail); 157 } 158 putIfMissing(HashMap<Key, Value> map, Key key, Value value)159 private static <Key, Value> void putIfMissing(HashMap<Key, Value> map, Key key, Value value) { 160 if (!map.containsKey(key)) { 161 map.put(key, value); 162 } 163 } 164 165 } 166