Ruben Brunk | e24b9a6 | 2016-02-16 21:38:24 -0800 | [diff] [blame] | 1 | /** |
| 2 | * Copyright (C) 2016 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 | package com.android.server.vr; |
| 17 | |
| 18 | import android.annotation.NonNull; |
| 19 | import android.app.ActivityManager; |
| 20 | import android.content.ComponentName; |
| 21 | import android.content.ContentResolver; |
| 22 | import android.content.Context; |
| 23 | import android.content.Intent; |
| 24 | import android.content.pm.PackageManager; |
| 25 | import android.content.pm.ResolveInfo; |
| 26 | import android.content.pm.ServiceInfo; |
Ruben Brunk | e24b9a6 | 2016-02-16 21:38:24 -0800 | [diff] [blame] | 27 | import android.os.Handler; |
| 28 | import android.os.Looper; |
| 29 | import android.os.UserHandle; |
| 30 | import android.os.UserManager; |
| 31 | import android.provider.Settings; |
| 32 | import android.text.TextUtils; |
| 33 | import android.util.ArraySet; |
| 34 | import android.util.Slog; |
| 35 | import android.util.SparseArray; |
| 36 | |
| 37 | import com.android.internal.content.PackageMonitor; |
| 38 | import com.android.server.vr.SettingsObserver.SettingChangeListener; |
| 39 | |
| 40 | import java.util.Collection; |
| 41 | import java.util.List; |
| 42 | import java.util.Set; |
| 43 | |
| 44 | /** |
| 45 | * Detects changes in packages, settings, and current users that may affect whether components |
| 46 | * implementing a given service can be run. |
| 47 | * |
| 48 | * @hide |
| 49 | */ |
| 50 | public class EnabledComponentsObserver implements SettingChangeListener { |
| 51 | |
| 52 | private static final String TAG = EnabledComponentsObserver.class.getSimpleName(); |
| 53 | private static final String ENABLED_SERVICES_SEPARATOR = ":"; |
| 54 | |
| 55 | public static final int NO_ERROR = 0; |
| 56 | public static final int DISABLED = -1; |
| 57 | public static final int NOT_INSTALLED = -2; |
| 58 | |
| 59 | private final Object mLock; |
| 60 | private final Context mContext; |
| 61 | private final String mSettingName; |
| 62 | private final String mServiceName; |
| 63 | private final String mServicePermission; |
| 64 | private final SparseArray<ArraySet<ComponentName>> mInstalledSet = new SparseArray<>(); |
| 65 | private final SparseArray<ArraySet<ComponentName>> mEnabledSet = new SparseArray<>(); |
| 66 | private final Set<EnabledComponentChangeListener> mEnabledComponentListeners = new ArraySet<>(); |
| 67 | |
| 68 | /** |
| 69 | * Implement this to receive callbacks when relevant changes to the allowed components occur. |
| 70 | */ |
| 71 | public interface EnabledComponentChangeListener { |
| 72 | |
| 73 | /** |
| 74 | * Called when a change in the allowed components occurs. |
| 75 | */ |
| 76 | void onEnabledComponentChanged(); |
| 77 | } |
| 78 | |
| 79 | private EnabledComponentsObserver(@NonNull Context context, @NonNull String settingName, |
| 80 | @NonNull String servicePermission, @NonNull String serviceName, @NonNull Object lock, |
| 81 | @NonNull Collection<EnabledComponentChangeListener> listeners) { |
| 82 | mLock = lock; |
| 83 | mContext = context; |
| 84 | mSettingName = settingName; |
| 85 | mServiceName = serviceName; |
| 86 | mServicePermission = servicePermission; |
| 87 | mEnabledComponentListeners.addAll(listeners); |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Create a EnabledComponentObserver instance. |
| 92 | * |
| 93 | * @param context the context to query for changes. |
| 94 | * @param handler a handler to receive lifecycle events from system services on. |
| 95 | * @param settingName the name of a setting to monitor for a list of enabled components. |
| 96 | * @param looper a {@link Looper} to use for receiving package callbacks. |
| 97 | * @param servicePermission the permission required by the components to be bound. |
| 98 | * @param serviceName the intent action implemented by the tracked components. |
| 99 | * @param lock a lock object used to guard instance state in all callbacks and method calls. |
| 100 | * @return an EnableComponentObserver instance. |
| 101 | */ |
| 102 | public static EnabledComponentsObserver build(@NonNull Context context, |
| 103 | @NonNull Handler handler, @NonNull String settingName, @NonNull Looper looper, |
| 104 | @NonNull String servicePermission, @NonNull String serviceName, |
| 105 | @NonNull final Object lock, |
| 106 | @NonNull Collection<EnabledComponentChangeListener> listeners) { |
| 107 | |
| 108 | SettingsObserver s = SettingsObserver.build(context, handler, settingName); |
| 109 | |
| 110 | final EnabledComponentsObserver o = new EnabledComponentsObserver(context, settingName, |
| 111 | servicePermission, serviceName, lock, listeners); |
| 112 | |
| 113 | PackageMonitor packageMonitor = new PackageMonitor() { |
| 114 | @Override |
| 115 | public void onSomePackagesChanged() { |
| 116 | o.onPackagesChanged(); |
| 117 | |
| 118 | } |
| 119 | |
| 120 | @Override |
| 121 | public void onPackageDisappeared(String packageName, int reason) { |
| 122 | o.onPackagesChanged(); |
| 123 | |
| 124 | } |
| 125 | |
| 126 | @Override |
| 127 | public void onPackageModified(String packageName) { |
| 128 | o.onPackagesChanged(); |
| 129 | |
| 130 | } |
| 131 | |
| 132 | @Override |
| 133 | public boolean onHandleForceStop(Intent intent, String[] packages, int uid, |
| 134 | boolean doit) { |
| 135 | o.onPackagesChanged(); |
| 136 | |
| 137 | return super.onHandleForceStop(intent, packages, uid, doit); |
| 138 | } |
| 139 | }; |
| 140 | |
| 141 | packageMonitor.register(context, looper, UserHandle.ALL, true); |
| 142 | |
| 143 | s.addListener(o); |
| 144 | |
| 145 | return o; |
| 146 | |
| 147 | } |
| 148 | |
| 149 | public void onPackagesChanged() { |
| 150 | rebuildAll(); |
| 151 | } |
| 152 | |
| 153 | @Override |
| 154 | public void onSettingChanged() { |
| 155 | rebuildAll(); |
| 156 | } |
| 157 | |
| 158 | @Override |
| 159 | public void onSettingRestored(String prevValue, String newValue, int userId) { |
| 160 | rebuildAll(); |
| 161 | } |
| 162 | |
| 163 | public void onUsersChanged() { |
| 164 | rebuildAll(); |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * Rebuild the sets of allowed components for each current user profile. |
| 169 | */ |
| 170 | public void rebuildAll() { |
| 171 | synchronized (mLock) { |
| 172 | mInstalledSet.clear(); |
| 173 | mEnabledSet.clear(); |
| 174 | final int[] userIds = getCurrentProfileIds(); |
| 175 | for (int i : userIds) { |
| 176 | ArraySet<ComponentName> implementingPackages = loadComponentNamesForUser(i); |
| 177 | ArraySet<ComponentName> packagesFromSettings = |
| 178 | loadComponentNamesFromSetting(mSettingName, i); |
| 179 | packagesFromSettings.retainAll(implementingPackages); |
| 180 | |
| 181 | mInstalledSet.put(i, implementingPackages); |
| 182 | mEnabledSet.put(i, packagesFromSettings); |
| 183 | |
| 184 | } |
| 185 | } |
| 186 | sendSettingChanged(); |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * Check whether a given component is present and enabled for the given user. |
| 191 | * |
| 192 | * @param component the component to check. |
| 193 | * @param userId the user ID for the component to check. |
| 194 | * @return {@code true} if present and enabled. |
| 195 | */ |
| 196 | public int isValid(ComponentName component, int userId) { |
| 197 | synchronized (mLock) { |
| 198 | ArraySet<ComponentName> installedComponents = mInstalledSet.get(userId); |
| 199 | if (installedComponents == null || !installedComponents.contains(component)) { |
| 200 | return NOT_INSTALLED; |
| 201 | } |
| 202 | ArraySet<ComponentName> validComponents = mEnabledSet.get(userId); |
| 203 | if (validComponents == null || !validComponents.contains(component)) { |
| 204 | return DISABLED; |
| 205 | } |
| 206 | return NO_ERROR; |
| 207 | } |
| 208 | } |
| 209 | |
Ruben Brunk | 2ff9c01 | 2016-04-28 10:58:29 -0700 | [diff] [blame] | 210 | /** |
| 211 | * Return all VrListenerService components installed for this user. |
| 212 | * |
| 213 | * @param userId ID of the user to check. |
| 214 | * @return a set of {@link ComponentName}s. |
| 215 | */ |
| 216 | public ArraySet<ComponentName> getInstalled(int userId) { |
| 217 | synchronized (mLock) { |
Ruben Brunk | 0ec069a | 2016-07-18 17:08:55 -0700 | [diff] [blame] | 218 | ArraySet<ComponentName> ret = mInstalledSet.get(userId); |
| 219 | if (ret == null) { |
| 220 | return new ArraySet<ComponentName>(); |
| 221 | } |
| 222 | return ret; |
Ruben Brunk | 2ff9c01 | 2016-04-28 10:58:29 -0700 | [diff] [blame] | 223 | } |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * Return all VrListenerService components enabled for this user. |
| 228 | * |
| 229 | * @param userId ID of the user to check. |
| 230 | * @return a set of {@link ComponentName}s. |
| 231 | */ |
| 232 | public ArraySet<ComponentName> getEnabled(int userId) { |
| 233 | synchronized (mLock) { |
Ruben Brunk | 0ec069a | 2016-07-18 17:08:55 -0700 | [diff] [blame] | 234 | ArraySet<ComponentName> ret = mEnabledSet.get(userId); |
| 235 | if (ret == null) { |
| 236 | return new ArraySet<ComponentName>(); |
| 237 | } |
| 238 | return ret; |
| 239 | |
Ruben Brunk | 2ff9c01 | 2016-04-28 10:58:29 -0700 | [diff] [blame] | 240 | } |
| 241 | } |
| 242 | |
Ruben Brunk | e24b9a6 | 2016-02-16 21:38:24 -0800 | [diff] [blame] | 243 | private int[] getCurrentProfileIds() { |
| 244 | UserManager userManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE); |
| 245 | if (userManager == null) { |
| 246 | return null; |
| 247 | } |
Ruben Brunk | 49506e0 | 2016-04-18 18:10:47 -0700 | [diff] [blame] | 248 | return userManager.getEnabledProfileIds(ActivityManager.getCurrentUser()); |
Ruben Brunk | e24b9a6 | 2016-02-16 21:38:24 -0800 | [diff] [blame] | 249 | } |
| 250 | |
Ruben Brunk | 98576cf | 2016-03-07 18:54:28 -0800 | [diff] [blame] | 251 | public static ArraySet<ComponentName> loadComponentNames(PackageManager pm, int userId, |
| 252 | String serviceName, String permissionName) { |
| 253 | |
Ruben Brunk | e24b9a6 | 2016-02-16 21:38:24 -0800 | [diff] [blame] | 254 | ArraySet<ComponentName> installed = new ArraySet<>(); |
Ruben Brunk | 98576cf | 2016-03-07 18:54:28 -0800 | [diff] [blame] | 255 | Intent queryIntent = new Intent(serviceName); |
Ruben Brunk | e24b9a6 | 2016-02-16 21:38:24 -0800 | [diff] [blame] | 256 | List<ResolveInfo> installedServices = pm.queryIntentServicesAsUser( |
| 257 | queryIntent, |
Ruben Brunk | 715fa57 | 2016-07-11 10:58:49 -0700 | [diff] [blame] | 258 | PackageManager.GET_SERVICES | PackageManager.GET_META_DATA | |
| 259 | PackageManager.MATCH_DIRECT_BOOT_AWARE | |
| 260 | PackageManager.MATCH_DIRECT_BOOT_UNAWARE, |
Ruben Brunk | e24b9a6 | 2016-02-16 21:38:24 -0800 | [diff] [blame] | 261 | userId); |
| 262 | if (installedServices != null) { |
| 263 | for (int i = 0, count = installedServices.size(); i < count; i++) { |
| 264 | ResolveInfo resolveInfo = installedServices.get(i); |
| 265 | ServiceInfo info = resolveInfo.serviceInfo; |
| 266 | |
| 267 | ComponentName component = new ComponentName(info.packageName, info.name); |
Ruben Brunk | 98576cf | 2016-03-07 18:54:28 -0800 | [diff] [blame] | 268 | if (!permissionName.equals(info.permission)) { |
Ruben Brunk | e24b9a6 | 2016-02-16 21:38:24 -0800 | [diff] [blame] | 269 | Slog.w(TAG, "Skipping service " + info.packageName + "/" + info.name |
| 270 | + ": it does not require the permission " |
Ruben Brunk | 98576cf | 2016-03-07 18:54:28 -0800 | [diff] [blame] | 271 | + permissionName); |
Ruben Brunk | e24b9a6 | 2016-02-16 21:38:24 -0800 | [diff] [blame] | 272 | continue; |
| 273 | } |
| 274 | installed.add(component); |
| 275 | } |
| 276 | } |
| 277 | return installed; |
| 278 | } |
| 279 | |
Ruben Brunk | 98576cf | 2016-03-07 18:54:28 -0800 | [diff] [blame] | 280 | private ArraySet<ComponentName> loadComponentNamesForUser(int userId) { |
| 281 | return loadComponentNames(mContext.getPackageManager(), userId, mServiceName, |
| 282 | mServicePermission); |
| 283 | } |
| 284 | |
Ruben Brunk | e24b9a6 | 2016-02-16 21:38:24 -0800 | [diff] [blame] | 285 | private ArraySet<ComponentName> loadComponentNamesFromSetting(String settingName, |
| 286 | int userId) { |
| 287 | final ContentResolver cr = mContext.getContentResolver(); |
| 288 | String settingValue = Settings.Secure.getStringForUser( |
| 289 | cr, |
| 290 | settingName, |
| 291 | userId); |
| 292 | if (TextUtils.isEmpty(settingValue)) |
| 293 | return new ArraySet<>(); |
| 294 | String[] restored = settingValue.split(ENABLED_SERVICES_SEPARATOR); |
| 295 | ArraySet<ComponentName> result = new ArraySet<>(restored.length); |
| 296 | for (int i = 0; i < restored.length; i++) { |
| 297 | ComponentName value = ComponentName.unflattenFromString(restored[i]); |
| 298 | if (null != value) { |
| 299 | result.add(value); |
| 300 | } |
| 301 | } |
| 302 | return result; |
| 303 | } |
| 304 | |
| 305 | private void sendSettingChanged() { |
| 306 | for (EnabledComponentChangeListener l : mEnabledComponentListeners) { |
| 307 | l.onEnabledComponentChanged(); |
| 308 | } |
| 309 | } |
| 310 | |
| 311 | } |