bpetrivs | 62f1598 | 2019-02-13 17:18:16 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 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.server.utils; |
| 18 | |
| 19 | import android.annotation.Nullable; |
| 20 | import android.provider.DeviceConfig; |
| 21 | |
bpetrivs | 93075f4 | 2019-02-28 12:08:12 +0000 | [diff] [blame] | 22 | import com.android.internal.annotations.VisibleForTesting; |
bpetrivs | 62f1598 | 2019-02-13 17:18:16 +0000 | [diff] [blame] | 23 | import com.android.server.RescueParty; |
| 24 | |
| 25 | import java.util.ArrayList; |
| 26 | import java.util.Arrays; |
| 27 | import java.util.List; |
| 28 | |
| 29 | /** |
| 30 | * Utilities for interacting with the {@link android.provider.DeviceConfig}. |
| 31 | * |
| 32 | * @hide |
| 33 | */ |
| 34 | public final class FlagNamespaceUtils { |
| 35 | /** |
| 36 | * Special String used for communicating through {@link #RESET_PLATFORM_PACKAGE_FLAG} that |
| 37 | * Settings were reset by the RescueParty, no actual namespace with this name exists in |
| 38 | * {@link DeviceConfig}. |
| 39 | */ |
| 40 | public static final String NAMESPACE_NO_PACKAGE = "no_package"; |
| 41 | |
| 42 | /** |
| 43 | * Name of the special namespace in DeviceConfig table used for communicating resets. |
| 44 | */ |
bpetrivs | 93075f4 | 2019-02-28 12:08:12 +0000 | [diff] [blame] | 45 | @VisibleForTesting |
| 46 | public static final String NAMESPACE_RESCUE_PARTY = "rescue_party_namespace"; |
bpetrivs | 62f1598 | 2019-02-13 17:18:16 +0000 | [diff] [blame] | 47 | /** |
| 48 | * Flag in the {@link DeviceConfig} in {@link #NAMESPACE_RESCUE_PARTY}, holding all known {@link |
| 49 | * DeviceConfig} namespaces, as a {@link #DELIMITER} separated String. It's updated after the |
| 50 | * first time flags are written to the new namespace in the {@link DeviceConfig}. |
| 51 | */ |
bpetrivs | 93075f4 | 2019-02-28 12:08:12 +0000 | [diff] [blame] | 52 | @VisibleForTesting |
| 53 | public static final String ALL_KNOWN_NAMESPACES_FLAG = "all_known_namespaces"; |
bpetrivs | 62f1598 | 2019-02-13 17:18:16 +0000 | [diff] [blame] | 54 | /** |
| 55 | * Flag in the {@link DeviceConfig} in {@link #NAMESPACE_RESCUE_PARTY} with integer counter |
| 56 | * suffix added to it, holding {@link DeviceConfig} namespace value whose flags were recently |
| 57 | * reset by the {@link RescueParty}. It's updated by {@link RescueParty} every time given |
| 58 | * namespace flags are reset. |
| 59 | */ |
bpetrivs | 93075f4 | 2019-02-28 12:08:12 +0000 | [diff] [blame] | 60 | @VisibleForTesting |
| 61 | public static final String RESET_PLATFORM_PACKAGE_FLAG = "reset_platform_package"; |
bpetrivs | 62f1598 | 2019-02-13 17:18:16 +0000 | [diff] [blame] | 62 | private static final String DELIMITER = ":"; |
| 63 | /** |
| 64 | * Maximum value of the counter used in combination with {@link #RESET_PLATFORM_PACKAGE_FLAG} |
| 65 | * when communicating recently reset by the RescueParty namespace values. |
| 66 | */ |
| 67 | private static final int MAX_COUNTER_VALUE = 50; |
| 68 | |
| 69 | private static int sKnownResetNamespacesFlagCounter = -1; |
| 70 | |
| 71 | /** |
| 72 | * Sets the union of {@link #RESET_PLATFORM_PACKAGE_FLAG} with |
| 73 | * {@link #sKnownResetNamespacesFlagCounter} in the DeviceConfig for each namespace |
| 74 | * in the consumed namespacesList. These flags are used for communicating the namespaces |
| 75 | * (aka platform packages) whose flags in {@link DeviceConfig} were just reset |
| 76 | * by the RescueParty. |
| 77 | */ |
| 78 | public static void addToKnownResetNamespaces(@Nullable List<String> namespacesList) { |
| 79 | if (namespacesList == null) { |
| 80 | return; |
| 81 | } |
| 82 | for (String namespace : namespacesList) { |
| 83 | addToKnownResetNamespaces(namespace); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Sets the union of {@link #RESET_PLATFORM_PACKAGE_FLAG} with |
| 89 | * {@link #sKnownResetNamespacesFlagCounter} in the DeviceConfig for the consumed namespace. |
| 90 | * This flag is used for communicating the namespace (aka platform package) whose flags |
| 91 | * in {@link DeviceConfig} were just reset by the RescueParty. |
| 92 | */ |
| 93 | public static void addToKnownResetNamespaces(String namespace) { |
| 94 | int nextFlagCounter = incrementAndRetrieveResetNamespacesFlagCounter(); |
| 95 | DeviceConfig.setProperty(NAMESPACE_RESCUE_PARTY, |
| 96 | RESET_PLATFORM_PACKAGE_FLAG + nextFlagCounter, |
| 97 | namespace, /*makeDefault=*/ true); |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Reset all namespaces in DeviceConfig with consumed resetMode. |
| 102 | */ |
| 103 | public static void resetDeviceConfig(int resetMode) { |
bpetrivs | 93075f4 | 2019-02-28 12:08:12 +0000 | [diff] [blame] | 104 | resetDeviceConfig(resetMode, getAllKnownDeviceConfigNamespacesList()); |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * Reset all consumed namespaces in DeviceConfig with consumed resetMode. |
| 109 | */ |
| 110 | public static void resetDeviceConfig(int resetMode, List<String> namespacesList) { |
| 111 | for (String namespace : namespacesList) { |
bpetrivs | 62f1598 | 2019-02-13 17:18:16 +0000 | [diff] [blame] | 112 | DeviceConfig.resetToDefaults(resetMode, namespace); |
| 113 | } |
bpetrivs | 93075f4 | 2019-02-28 12:08:12 +0000 | [diff] [blame] | 114 | addToKnownResetNamespaces(namespacesList); |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * Resets known reset namespaces flag counter for tests only. |
| 119 | */ |
| 120 | @VisibleForTesting |
| 121 | public static void resetKnownResetNamespacesFlagCounterForTest() { |
| 122 | sKnownResetNamespacesFlagCounter = -1; |
bpetrivs | 62f1598 | 2019-02-13 17:18:16 +0000 | [diff] [blame] | 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Returns a list of all known DeviceConfig namespaces, except for the special {@link |
| 127 | * #NAMESPACE_RESCUE_PARTY} |
| 128 | */ |
| 129 | private static List<String> getAllKnownDeviceConfigNamespacesList() { |
| 130 | String namespacesStr = DeviceConfig.getProperty(NAMESPACE_RESCUE_PARTY, |
| 131 | ALL_KNOWN_NAMESPACES_FLAG); |
| 132 | List<String> namespacesList = toStringList(namespacesStr); |
| 133 | namespacesList.remove(NAMESPACE_RESCUE_PARTY); |
| 134 | return namespacesList; |
| 135 | } |
| 136 | |
| 137 | private static List<String> toStringList(String serialized) { |
| 138 | if (serialized == null || serialized.length() == 0) { |
| 139 | return new ArrayList<>(); |
| 140 | } |
| 141 | return Arrays.asList(serialized.split(DELIMITER)); |
| 142 | } |
| 143 | |
| 144 | private static int incrementAndRetrieveResetNamespacesFlagCounter() { |
| 145 | sKnownResetNamespacesFlagCounter++; |
| 146 | if (sKnownResetNamespacesFlagCounter == MAX_COUNTER_VALUE) { |
| 147 | sKnownResetNamespacesFlagCounter = 0; |
| 148 | } |
| 149 | return sKnownResetNamespacesFlagCounter; |
| 150 | } |
| 151 | } |