| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License |
| */ |
| package com.android.providers.blockednumber; |
| |
| import static android.util.Log.isLoggable; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.content.Context; |
| import android.location.Country; |
| import android.location.CountryDetector; |
| import android.net.Uri; |
| import android.os.Build; |
| import android.telecom.PhoneAccount; |
| import android.telephony.PhoneNumberUtils; |
| import android.text.TextUtils; |
| |
| import java.util.Locale; |
| |
| public class Utils { |
| /** |
| * When generating a bug report, include the last X dialable digits when logging phone numbers. |
| */ |
| private static final int NUM_DIALABLE_DIGITS_TO_LOG = Build.IS_USER ? 0 : 2; |
| |
| private Utils() { |
| } |
| |
| public static final int MIN_INDEX_LEN = 8; |
| public static String TAG = "BlockedNumberProvider"; |
| public static boolean VERBOSE = isLoggable(TAG, android.util.Log.VERBOSE); |
| |
| /** |
| * @return The current country code. |
| */ |
| public static @NonNull String getCurrentCountryIso(@NonNull Context context) { |
| final CountryDetector detector = (CountryDetector) context.getSystemService( |
| Context.COUNTRY_DETECTOR); |
| if (detector != null) { |
| final Country country = detector.detectCountry(); |
| if (country != null) { |
| return country.getCountryIso(); |
| } |
| } |
| final Locale locale = context.getResources().getConfiguration().locale; |
| return locale.getCountry(); |
| } |
| |
| /** |
| * Converts a phone number to an E164 number, assuming the current country. If {@code |
| * incomingE16Number} is provided, it'll just strip it and returns. If the number is not valid, |
| * it'll return "". |
| * |
| * <p>Special case: if {@code rawNumber} contains '@', it's considered as an email address and |
| * returned unmodified. |
| */ |
| public static @NonNull String getE164Number(@NonNull Context context, |
| @Nullable String rawNumber, @Nullable String incomingE16Number) { |
| if (rawNumber != null && rawNumber.contains("@")) { |
| return rawNumber; |
| } |
| if (!TextUtils.isEmpty(incomingE16Number)) { |
| return incomingE16Number; |
| } |
| if (TextUtils.isEmpty(rawNumber)) { |
| return ""; |
| } |
| final String e164 = |
| PhoneNumberUtils.formatNumberToE164(rawNumber, getCurrentCountryIso(context)); |
| return e164 == null ? "" : e164; |
| } |
| |
| public static @Nullable String wrapSelectionWithParens(@Nullable String selection) { |
| return TextUtils.isEmpty(selection) ? null : "(" + selection + ")"; |
| } |
| |
| /** |
| * Generates an obfuscated string for a calling handle in {@link Uri} format, or a raw phone |
| * phone number in {@link String} format. |
| * @param pii The information to obfuscate. |
| * @return The obfuscated string. |
| */ |
| public static String piiHandle(Object pii) { |
| if (pii == null || VERBOSE) { |
| return String.valueOf(pii); |
| } |
| |
| StringBuilder sb = new StringBuilder(); |
| if (pii instanceof Uri) { |
| Uri uri = (Uri) pii; |
| String scheme = uri.getScheme(); |
| |
| if (!TextUtils.isEmpty(scheme)) { |
| sb.append(scheme).append(":"); |
| } |
| |
| String textToObfuscate = uri.getSchemeSpecificPart(); |
| if (PhoneAccount.SCHEME_TEL.equals(scheme)) { |
| obfuscatePhoneNumber(sb, textToObfuscate); |
| } else if (PhoneAccount.SCHEME_SIP.equals(scheme)) { |
| for (int i = 0; i < textToObfuscate.length(); i++) { |
| char c = textToObfuscate.charAt(i); |
| if (c != '@' && c != '.') { |
| c = '*'; |
| } |
| sb.append(c); |
| } |
| } else { |
| sb.append(pii(pii)); |
| } |
| } else if (pii instanceof String) { |
| String number = (String) pii; |
| obfuscatePhoneNumber(sb, number); |
| } |
| |
| return sb.toString(); |
| } |
| |
| /** |
| * Obfuscates a phone number, allowing NUM_DIALABLE_DIGITS_TO_LOG digits to be exposed for the |
| * phone number. |
| * @param sb String buffer to write obfuscated number to. |
| * @param phoneNumber The number to obfuscate. |
| */ |
| private static void obfuscatePhoneNumber(StringBuilder sb, String phoneNumber) { |
| int numDigitsToObfuscate = getDialableCount(phoneNumber) |
| - NUM_DIALABLE_DIGITS_TO_LOG; |
| for (int i = 0; i < phoneNumber.length(); i++) { |
| char c = phoneNumber.charAt(i); |
| boolean isDialable = PhoneNumberUtils.isDialable(c); |
| if (isDialable) { |
| numDigitsToObfuscate--; |
| } |
| sb.append(isDialable && numDigitsToObfuscate >= 0 ? "*" : c); |
| } |
| } |
| |
| /** |
| * Redact personally identifiable information for production users. |
| * If we are running in verbose mode, return the original string, |
| * and return "***" otherwise. |
| */ |
| public static String pii(Object pii) { |
| if (pii == null || VERBOSE) { |
| return String.valueOf(pii); |
| } |
| return "***"; |
| } |
| |
| /** |
| * Determines the number of dialable characters in a string. |
| * @param toCount The string to count dialable characters in. |
| * @return The count of dialable characters. |
| */ |
| private static int getDialableCount(String toCount) { |
| int numDialable = 0; |
| for (char c : toCount.toCharArray()) { |
| if (PhoneNumberUtils.isDialable(c)) { |
| numDialable++; |
| } |
| } |
| return numDialable; |
| } |
| } |