1 /* 2 * Copyright (C) 2022 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.adservices.service.consent; 18 19 import android.annotation.NonNull; 20 import android.content.Context; 21 import android.telephony.TelephonyManager; 22 import android.text.TextUtils; 23 24 import com.android.adservices.LogUtil; 25 import com.android.adservices.service.Flags; 26 import com.android.adservices.service.FlagsFactory; 27 28 import java.util.Locale; 29 import java.util.Objects; 30 import java.util.Set; 31 32 /** 33 * Provides information about the region of the device which is used. Currently it's used only to 34 * determine whether the device should be treated as EU or non-EU. 35 */ 36 public class DeviceRegionProvider { 37 private static final String FEATURE_TELEPHONY = "android.hardware.telephony"; 38 39 /** 40 * @return true if the device should be treated as EU device, otherwise false. 41 * @param context {@link Context} of the caller. 42 */ 43 // TODO(b/311183933): Remove passed in Context from static method. 44 @SuppressWarnings("AvoidStaticContext") isEuDevice(@onNull Context context)45 public static boolean isEuDevice(@NonNull Context context) { 46 Objects.requireNonNull(context); 47 48 Flags flags = FlagsFactory.getFlags(); 49 if (flags.getEnableTabletRegionFix() && flags.isEeaDeviceFeatureEnabled()) { 50 LogUtil.d("Server side region detection for tablet and phone enabled."); 51 return FlagsFactory.getFlags().isEeaDevice(); 52 } 53 // We don't need following logic once the enableTabletRegionFix is fully ramp up. 54 if (context.getPackageManager().hasSystemFeature(FEATURE_TELEPHONY)) { 55 TelephonyManager telephonyManager = context.getSystemService(TelephonyManager.class); 56 // if there is no telephony manager accessible, we fall back to EU device 57 if (telephonyManager == null) return true; 58 59 // we use PH to determine whether device is in the EEA region. 60 if (FlagsFactory.getFlags().isEeaDeviceFeatureEnabled()) { 61 LogUtil.d("Server side region detection enabled."); 62 return FlagsFactory.getFlags().isEeaDevice(); 63 } 64 65 // and fall back to sim card locations if the feature is not yet enabled. 66 // if there is no sim card installed, we fall back to EU device 67 String deviceCountryIso = telephonyManager.getSimCountryIso(); 68 if (deviceCountryIso.isEmpty()) { 69 return true; 70 } 71 72 // if simCountryIso detects the user's country as one of EEA countries 73 // we treat this device as EU device, otherwise ROW device 74 if (getUiEeaCountriesSet().contains(deviceCountryIso.toUpperCase(Locale.ENGLISH))) { 75 return true; 76 } 77 return false; 78 } 79 // if there is no telephony feature, we fall back to EU device 80 return true; 81 } 82 getUiEeaCountriesSet()83 private static Set<String> getUiEeaCountriesSet() { 84 String uiEeaCountries = FlagsFactory.getFlags().getUiEeaCountries(); 85 if (!isValidEeaCountriesString(uiEeaCountries)) { 86 LogUtil.e("Invalid EEA countries string."); 87 return Set.of(); 88 } else { 89 return Set.of(uiEeaCountries.split(",")); 90 } 91 } 92 93 /** Checks whether an EEA countries string is valid. */ isValidEeaCountriesString(String str)94 public static boolean isValidEeaCountriesString(String str) { 95 if (str == null || TextUtils.isEmpty(str)) { 96 return false; 97 } 98 return (str + ",") 99 .matches(String.format(Locale.US, "^([A-Z]{2},){%d}$", (str.length() + 1) / 3)); 100 } 101 } 102