1 /* 2 * Copyright (C) 2018 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.dialer.oem; 18 19 import android.content.Context; 20 import android.os.Build; 21 import android.support.annotation.VisibleForTesting; 22 import com.android.dialer.common.Assert; 23 import com.android.dialer.compat.telephony.TelephonyManagerCompat; 24 import com.google.common.collect.ImmutableSet; 25 26 /** Utilities for Transsion devices. */ 27 public final class TranssionUtils { 28 29 @VisibleForTesting 30 public static final ImmutableSet<String> TRANSSION_DEVICE_MANUFACTURERS = 31 ImmutableSet.of("INFINIX MOBILITY LIMITED", "itel", "TECNO"); 32 33 @VisibleForTesting 34 public static final ImmutableSet<String> TRANSSION_SECRET_CODES = 35 ImmutableSet.of("*#07#", "*#87#", "*#43#", "*#2727#", "*#88#"); 36 TranssionUtils()37 private TranssionUtils() {} 38 39 /** 40 * Returns true if 41 * 42 * <ul> 43 * <li>the device is a Transsion device, AND 44 * <li>the input is a secret code for Transsion devices. 45 * </ul> 46 */ isTranssionSecretCode(String input)47 public static boolean isTranssionSecretCode(String input) { 48 return TRANSSION_DEVICE_MANUFACTURERS.contains(Build.MANUFACTURER) 49 && TRANSSION_SECRET_CODES.contains(input); 50 } 51 52 /** 53 * Handle a Transsion secret code by passing it to {@link 54 * TelephonyManagerCompat#handleSecretCode(Context, String)}. 55 * 56 * <p>Before calling this method, we must use {@link #isTranssionSecretCode(String)} to ensure the 57 * device is a Transsion device and the input is a valid Transsion secret code. 58 * 59 * <p>An exception will be thrown if either of the conditions above is not met. 60 */ handleTranssionSecretCode(Context context, String input)61 public static void handleTranssionSecretCode(Context context, String input) { 62 Assert.checkState(isTranssionSecretCode(input)); 63 64 TelephonyManagerCompat.handleSecretCode(context, getDigitsFromSecretCode(input)); 65 } 66 getDigitsFromSecretCode(String input)67 private static String getDigitsFromSecretCode(String input) { 68 // We assume a valid secret code is of format "*#{[0-9]+}#". 69 Assert.checkArgument(input.length() > 3 && input.startsWith("*#") && input.endsWith("#")); 70 71 return input.substring(2, input.length() - 1); 72 } 73 } 74