Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 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.server.role; |
| 18 | |
| 19 | import android.annotation.CheckResult; |
| 20 | import android.annotation.NonNull; |
| 21 | import android.annotation.Nullable; |
| 22 | import android.annotation.UserIdInt; |
| 23 | import android.annotation.WorkerThread; |
| 24 | import android.os.Environment; |
| 25 | import android.os.Handler; |
| 26 | import android.util.ArrayMap; |
| 27 | import android.util.ArraySet; |
| 28 | import android.util.AtomicFile; |
| 29 | import android.util.Slog; |
| 30 | import android.util.Xml; |
| 31 | |
| 32 | import com.android.internal.annotations.GuardedBy; |
| 33 | import com.android.internal.os.BackgroundThread; |
Eugene Susla | abdefba | 2018-11-09 18:06:43 -0800 | [diff] [blame] | 34 | import com.android.internal.util.CollectionUtils; |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 35 | import com.android.internal.util.function.pooled.PooledLambda; |
| 36 | |
| 37 | import libcore.io.IoUtils; |
| 38 | |
| 39 | import org.xmlpull.v1.XmlPullParser; |
| 40 | import org.xmlpull.v1.XmlPullParserException; |
| 41 | import org.xmlpull.v1.XmlSerializer; |
| 42 | |
| 43 | import java.io.File; |
| 44 | import java.io.FileInputStream; |
| 45 | import java.io.FileNotFoundException; |
| 46 | import java.io.FileOutputStream; |
| 47 | import java.io.IOException; |
| 48 | import java.nio.charset.StandardCharsets; |
Hai Zhang | 8e60a8f | 2018-11-20 11:21:09 -0800 | [diff] [blame] | 49 | import java.util.List; |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 50 | import java.util.Objects; |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 51 | |
| 52 | /** |
| 53 | * Stores the state of roles for a user. |
| 54 | */ |
| 55 | public class RoleUserState { |
| 56 | |
| 57 | private static final String LOG_TAG = RoleUserState.class.getSimpleName(); |
| 58 | |
| 59 | public static final int VERSION_UNDEFINED = -1; |
| 60 | |
| 61 | private static final String ROLES_FILE_NAME = "roles.xml"; |
| 62 | |
Hai Zhang | b3e9b9b | 2018-12-05 18:32:40 -0800 | [diff] [blame^] | 63 | private static final long WRITE_DELAY_MILLIS = 200; |
| 64 | private static final long MAX_WRITE_DELAY_MILLIS = 2000; |
| 65 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 66 | private static final String TAG_ROLES = "roles"; |
| 67 | private static final String TAG_ROLE = "role"; |
| 68 | private static final String TAG_HOLDER = "holder"; |
| 69 | private static final String ATTRIBUTE_VERSION = "version"; |
| 70 | private static final String ATTRIBUTE_NAME = "name"; |
Eugene Susla | abdefba | 2018-11-09 18:06:43 -0800 | [diff] [blame] | 71 | private static final String ATTRIBUTE_PACKAGES_HASH = "packagesHash"; |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 72 | |
| 73 | @UserIdInt |
| 74 | private final int mUserId; |
| 75 | |
| 76 | @GuardedBy("RoleManagerService.mLock") |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 77 | private int mVersion = VERSION_UNDEFINED; |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 78 | |
Eugene Susla | abdefba | 2018-11-09 18:06:43 -0800 | [diff] [blame] | 79 | @GuardedBy("RoleManagerService.mLock") |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 80 | @Nullable |
| 81 | private String mLastGrantPackagesHash; |
Eugene Susla | abdefba | 2018-11-09 18:06:43 -0800 | [diff] [blame] | 82 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 83 | /** |
| 84 | * Maps role names to its holders' package names. The values should never be null. |
| 85 | */ |
| 86 | @GuardedBy("RoleManagerService.mLock") |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 87 | @NonNull |
| 88 | private ArrayMap<String, ArraySet<String>> mRoles = new ArrayMap<>(); |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 89 | |
| 90 | @GuardedBy("RoleManagerService.mLock") |
Hai Zhang | b3e9b9b | 2018-12-05 18:32:40 -0800 | [diff] [blame^] | 91 | private long mWritePendingSinceMillis; |
| 92 | |
| 93 | @GuardedBy("RoleManagerService.mLock") |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 94 | private boolean mDestroyed; |
| 95 | |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 96 | @NonNull |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 97 | private final Handler mWriteHandler = new Handler(BackgroundThread.getHandler().getLooper()); |
| 98 | |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 99 | private RoleUserState(@UserIdInt int userId) { |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 100 | mUserId = userId; |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 101 | |
| 102 | readSyncLocked(); |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * Create a new instance of user state, and read its state from disk if previously persisted. |
| 107 | * |
| 108 | * @param userId the user id for the new user state |
| 109 | * |
| 110 | * @return the new user state |
| 111 | */ |
| 112 | @GuardedBy("RoleManagerService.mLock") |
| 113 | public static RoleUserState newInstanceLocked(@UserIdInt int userId) { |
| 114 | return new RoleUserState(userId); |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | /** |
| 118 | * Get the version of this user state. |
| 119 | */ |
| 120 | @GuardedBy("RoleManagerService.mLock") |
| 121 | public int getVersionLocked() { |
| 122 | throwIfDestroyedLocked(); |
| 123 | return mVersion; |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * Set the version of this user state. |
| 128 | * |
| 129 | * @param version the version to set |
| 130 | */ |
| 131 | @GuardedBy("RoleManagerService.mLock") |
| 132 | public void setVersionLocked(int version) { |
| 133 | throwIfDestroyedLocked(); |
Hai Zhang | 8e60a8f | 2018-11-20 11:21:09 -0800 | [diff] [blame] | 134 | if (mVersion == version) { |
| 135 | return; |
| 136 | } |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 137 | mVersion = version; |
Hai Zhang | 8e60a8f | 2018-11-20 11:21:09 -0800 | [diff] [blame] | 138 | writeAsyncLocked(); |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 139 | } |
| 140 | |
| 141 | /** |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 142 | * Get the hash representing the state of packages during the last time initial grants was run. |
| 143 | * |
| 144 | * @return the hash representing the state of packages |
Eugene Susla | abdefba | 2018-11-09 18:06:43 -0800 | [diff] [blame] | 145 | */ |
| 146 | @GuardedBy("RoleManagerService.mLock") |
| 147 | public String getLastGrantPackagesHashLocked() { |
| 148 | return mLastGrantPackagesHash; |
| 149 | } |
| 150 | |
| 151 | /** |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 152 | * Set the hash representing the state of packages during the last time initial grants was run. |
| 153 | * |
| 154 | * @param lastGrantPackagesHash the hash representing the state of packages |
Eugene Susla | abdefba | 2018-11-09 18:06:43 -0800 | [diff] [blame] | 155 | */ |
| 156 | @GuardedBy("RoleManagerService.mLock") |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 157 | public void setLastGrantPackagesHashLocked(@Nullable String lastGrantPackagesHash) { |
| 158 | throwIfDestroyedLocked(); |
| 159 | if (Objects.equals(mLastGrantPackagesHash, lastGrantPackagesHash)) { |
| 160 | return; |
| 161 | } |
Eugene Susla | abdefba | 2018-11-09 18:06:43 -0800 | [diff] [blame] | 162 | mLastGrantPackagesHash = lastGrantPackagesHash; |
| 163 | writeAsyncLocked(); |
| 164 | } |
| 165 | |
| 166 | /** |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 167 | * Get whether the role is available. |
| 168 | * |
| 169 | * @param roleName the name of the role to get the holders for |
| 170 | * |
| 171 | * @return whether the role is available |
| 172 | */ |
| 173 | @GuardedBy("RoleManagerService.mLock") |
| 174 | public boolean isRoleAvailableLocked(@NonNull String roleName) { |
| 175 | throwIfDestroyedLocked(); |
| 176 | return mRoles.containsKey(roleName); |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * Get the holders of a role. |
| 181 | * |
| 182 | * @param roleName the name of the role to query for |
| 183 | * |
| 184 | * @return the set of role holders. {@code null} should not be returned and indicates an issue. |
| 185 | */ |
| 186 | @GuardedBy("RoleManagerService.mLock") |
| 187 | @Nullable |
| 188 | public ArraySet<String> getRoleHoldersLocked(@NonNull String roleName) { |
| 189 | throwIfDestroyedLocked(); |
| 190 | return mRoles.get(roleName); |
| 191 | } |
| 192 | |
| 193 | /** |
Hai Zhang | 8e60a8f | 2018-11-20 11:21:09 -0800 | [diff] [blame] | 194 | * Set the names of all available roles. |
| 195 | * |
| 196 | * @param roleNames the names of all the available roles |
| 197 | */ |
| 198 | @GuardedBy("RoleManagerService.mLock") |
| 199 | public void setRoleNamesLocked(@NonNull List<String> roleNames) { |
| 200 | throwIfDestroyedLocked(); |
| 201 | boolean changed = false; |
| 202 | for (int i = mRoles.size() - 1; i >= 0; i--) { |
| 203 | String roleName = mRoles.keyAt(i); |
| 204 | if (!roleNames.contains(roleName)) { |
| 205 | ArraySet<String> packageNames = mRoles.valueAt(i); |
| 206 | if (!packageNames.isEmpty()) { |
| 207 | Slog.e(LOG_TAG, "Holders of a removed role should have been cleaned up, role: " |
| 208 | + roleName + ", holders: " + packageNames); |
| 209 | } |
| 210 | mRoles.removeAt(i); |
| 211 | changed = true; |
| 212 | } |
| 213 | } |
| 214 | int roleNamesSize = roleNames.size(); |
| 215 | for (int i = 0; i < roleNamesSize; i++) { |
| 216 | String roleName = roleNames.get(i); |
| 217 | if (!mRoles.containsKey(roleName)) { |
| 218 | mRoles.put(roleName, new ArraySet<>()); |
| 219 | Slog.i(LOG_TAG, "Added new role: " + roleName); |
| 220 | changed = true; |
| 221 | } |
| 222 | } |
| 223 | if (changed) { |
| 224 | writeAsyncLocked(); |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | /** |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 229 | * Add a holder to a role. |
| 230 | * |
| 231 | * @param roleName the name of the role to add the holder to |
| 232 | * @param packageName the package name of the new holder |
| 233 | * |
| 234 | * @return {@code false} only if the set of role holders is null, which should not happen and |
| 235 | * indicates an issue. |
| 236 | */ |
| 237 | @CheckResult |
| 238 | @GuardedBy("RoleManagerService.mLock") |
| 239 | public boolean addRoleHolderLocked(@NonNull String roleName, @NonNull String packageName) { |
| 240 | throwIfDestroyedLocked(); |
| 241 | ArraySet<String> roleHolders = mRoles.get(roleName); |
| 242 | if (roleHolders == null) { |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 243 | Slog.e(LOG_TAG, "Cannot add role holder for unknown role, role: " + roleName |
| 244 | + ", package: " + packageName); |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 245 | return false; |
| 246 | } |
Hai Zhang | 8e60a8f | 2018-11-20 11:21:09 -0800 | [diff] [blame] | 247 | boolean changed = roleHolders.add(packageName); |
| 248 | if (changed) { |
| 249 | writeAsyncLocked(); |
| 250 | } |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 251 | return true; |
| 252 | } |
| 253 | |
| 254 | /** |
| 255 | * Remove a holder from a role. |
| 256 | * |
| 257 | * @param roleName the name of the role to remove the holder from |
| 258 | * @param packageName the package name of the holder to remove |
| 259 | * |
| 260 | * @return {@code false} only if the set of role holders is null, which should not happen and |
| 261 | * indicates an issue. |
| 262 | */ |
| 263 | @CheckResult |
| 264 | @GuardedBy("RoleManagerService.mLock") |
| 265 | public boolean removeRoleHolderLocked(@NonNull String roleName, @NonNull String packageName) { |
| 266 | throwIfDestroyedLocked(); |
| 267 | ArraySet<String> roleHolders = mRoles.get(roleName); |
| 268 | if (roleHolders == null) { |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 269 | Slog.e(LOG_TAG, "Cannot remove role holder for unknown role, role: " + roleName |
| 270 | + ", package: " + packageName); |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 271 | return false; |
| 272 | } |
Hai Zhang | 8e60a8f | 2018-11-20 11:21:09 -0800 | [diff] [blame] | 273 | boolean changed = roleHolders.remove(packageName); |
| 274 | if (changed) { |
| 275 | writeAsyncLocked(); |
| 276 | } |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 277 | return true; |
| 278 | } |
| 279 | |
| 280 | /** |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 281 | * Schedule writing the state to file. |
| 282 | */ |
| 283 | @GuardedBy("RoleManagerService.mLock") |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 284 | private void writeAsyncLocked() { |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 285 | throwIfDestroyedLocked(); |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 286 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 287 | ArrayMap<String, ArraySet<String>> roles = new ArrayMap<>(); |
Eugene Susla | abdefba | 2018-11-09 18:06:43 -0800 | [diff] [blame] | 288 | for (int i = 0, size = CollectionUtils.size(mRoles); i < size; ++i) { |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 289 | String roleName = mRoles.keyAt(i); |
| 290 | ArraySet<String> roleHolders = mRoles.valueAt(i); |
Hai Zhang | b3e9b9b | 2018-12-05 18:32:40 -0800 | [diff] [blame^] | 291 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 292 | roleHolders = new ArraySet<>(roleHolders); |
| 293 | roles.put(roleName, roleHolders); |
| 294 | } |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 295 | |
Hai Zhang | b3e9b9b | 2018-12-05 18:32:40 -0800 | [diff] [blame^] | 296 | long currentTimeMillis = System.currentTimeMillis(); |
| 297 | long writeDelayMillis; |
| 298 | if (!mWriteHandler.hasMessagesOrCallbacks()) { |
| 299 | mWritePendingSinceMillis = currentTimeMillis; |
| 300 | writeDelayMillis = WRITE_DELAY_MILLIS; |
| 301 | } else { |
| 302 | mWriteHandler.removeCallbacksAndMessages(null); |
| 303 | long writePendingDurationMillis = currentTimeMillis - mWritePendingSinceMillis; |
| 304 | if (writePendingDurationMillis >= MAX_WRITE_DELAY_MILLIS) { |
| 305 | writeDelayMillis = 0; |
| 306 | } else { |
| 307 | long maxWriteDelayMillis = Math.max(MAX_WRITE_DELAY_MILLIS |
| 308 | - writePendingDurationMillis, 0); |
| 309 | writeDelayMillis = Math.min(WRITE_DELAY_MILLIS, maxWriteDelayMillis); |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | mWriteHandler.sendMessageDelayed(PooledLambda.obtainMessage(RoleUserState::writeSync, this, |
| 314 | mVersion, mLastGrantPackagesHash, roles), writeDelayMillis); |
| 315 | Slog.i(LOG_TAG, "Scheduled writing roles.xml"); |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 316 | } |
| 317 | |
| 318 | @WorkerThread |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 319 | private void writeSync(int version, @Nullable String packagesHash, |
| 320 | @NonNull ArrayMap<String, ArraySet<String>> roles) { |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 321 | AtomicFile atomicFile = new AtomicFile(getFile(mUserId), "roles-" + mUserId); |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 322 | FileOutputStream out = null; |
| 323 | try { |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 324 | out = atomicFile.startWrite(); |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 325 | |
| 326 | XmlSerializer serializer = Xml.newSerializer(); |
| 327 | serializer.setOutput(out, StandardCharsets.UTF_8.name()); |
| 328 | serializer.setFeature( |
| 329 | "http://xmlpull.org/v1/doc/features.html#indent-output", true); |
| 330 | serializer.startDocument(null, true); |
| 331 | |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 332 | serializeRoles(serializer, version, packagesHash, roles); |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 333 | |
| 334 | serializer.endDocument(); |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 335 | atomicFile.finishWrite(out); |
Hai Zhang | b3e9b9b | 2018-12-05 18:32:40 -0800 | [diff] [blame^] | 336 | Slog.i(LOG_TAG, "Wrote roles.xml successfully"); |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 337 | } catch (IllegalArgumentException | IllegalStateException | IOException e) { |
| 338 | Slog.wtf(LOG_TAG, "Failed to write roles.xml, restoring backup", e); |
| 339 | if (out != null) { |
| 340 | atomicFile.failWrite(out); |
| 341 | } |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 342 | } finally { |
| 343 | IoUtils.closeQuietly(out); |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | @WorkerThread |
| 348 | private void serializeRoles(@NonNull XmlSerializer serializer, int version, |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 349 | @Nullable String packagesHash, @NonNull ArrayMap<String, ArraySet<String>> roles) |
Eugene Susla | abdefba | 2018-11-09 18:06:43 -0800 | [diff] [blame] | 350 | throws IOException { |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 351 | serializer.startTag(null, TAG_ROLES); |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 352 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 353 | serializer.attribute(null, ATTRIBUTE_VERSION, Integer.toString(version)); |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 354 | |
| 355 | if (packagesHash != null) { |
| 356 | serializer.attribute(null, ATTRIBUTE_PACKAGES_HASH, packagesHash); |
| 357 | } |
| 358 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 359 | for (int i = 0, size = roles.size(); i < size; ++i) { |
| 360 | String roleName = roles.keyAt(i); |
| 361 | ArraySet<String> roleHolders = roles.valueAt(i); |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 362 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 363 | serializer.startTag(null, TAG_ROLE); |
| 364 | serializer.attribute(null, ATTRIBUTE_NAME, roleName); |
| 365 | serializeRoleHolders(serializer, roleHolders); |
| 366 | serializer.endTag(null, TAG_ROLE); |
| 367 | } |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 368 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 369 | serializer.endTag(null, TAG_ROLES); |
| 370 | } |
| 371 | |
| 372 | @WorkerThread |
| 373 | private void serializeRoleHolders(@NonNull XmlSerializer serializer, |
| 374 | @NonNull ArraySet<String> roleHolders) throws IOException { |
| 375 | for (int i = 0, size = roleHolders.size(); i < size; ++i) { |
| 376 | String roleHolder = roleHolders.valueAt(i); |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 377 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 378 | serializer.startTag(null, TAG_HOLDER); |
| 379 | serializer.attribute(null, ATTRIBUTE_NAME, roleHolder); |
| 380 | serializer.endTag(null, TAG_HOLDER); |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | /** |
| 385 | * Read the state from file. |
| 386 | */ |
| 387 | @GuardedBy("RoleManagerService.mLock") |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 388 | private void readSyncLocked() { |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 389 | File file = getFile(mUserId); |
| 390 | try (FileInputStream in = new AtomicFile(file).openRead()) { |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 391 | XmlPullParser parser = Xml.newPullParser(); |
| 392 | parser.setInput(in, null); |
| 393 | parseXmlLocked(parser); |
Hai Zhang | b3e9b9b | 2018-12-05 18:32:40 -0800 | [diff] [blame^] | 394 | Slog.i(LOG_TAG, "Read roles.xml successfully"); |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 395 | } catch (FileNotFoundException e) { |
| 396 | Slog.i(LOG_TAG, "roles.xml not found"); |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 397 | } catch (XmlPullParserException | IOException e) { |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 398 | throw new IllegalStateException("Failed to parse roles.xml: " + file, e); |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 399 | } |
| 400 | } |
| 401 | |
| 402 | private void parseXmlLocked(@NonNull XmlPullParser parser) throws IOException, |
| 403 | XmlPullParserException { |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 404 | int type; |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 405 | int depth; |
| 406 | int innerDepth = parser.getDepth() + 1; |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 407 | while ((type = parser.next()) != XmlPullParser.END_DOCUMENT |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 408 | && ((depth = parser.getDepth()) >= innerDepth || type != XmlPullParser.END_TAG)) { |
| 409 | if (depth > innerDepth || type != XmlPullParser.START_TAG) { |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 410 | continue; |
| 411 | } |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 412 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 413 | if (parser.getName().equals(TAG_ROLES)) { |
| 414 | parseRolesLocked(parser); |
| 415 | return; |
| 416 | } |
| 417 | } |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 418 | Slog.w(LOG_TAG, "Missing <" + TAG_ROLES + "> in roles.xml"); |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | private void parseRolesLocked(@NonNull XmlPullParser parser) throws IOException, |
| 422 | XmlPullParserException { |
| 423 | mVersion = Integer.parseInt(parser.getAttributeValue(null, ATTRIBUTE_VERSION)); |
Eugene Susla | abdefba | 2018-11-09 18:06:43 -0800 | [diff] [blame] | 424 | mLastGrantPackagesHash = parser.getAttributeValue(null, ATTRIBUTE_PACKAGES_HASH); |
Hai Zhang | 458cedb | 2018-12-03 15:41:11 -0800 | [diff] [blame] | 425 | mRoles.clear(); |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 426 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 427 | int type; |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 428 | int depth; |
| 429 | int innerDepth = parser.getDepth() + 1; |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 430 | while ((type = parser.next()) != XmlPullParser.END_DOCUMENT |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 431 | && ((depth = parser.getDepth()) >= innerDepth || type != XmlPullParser.END_TAG)) { |
| 432 | if (depth > innerDepth || type != XmlPullParser.START_TAG) { |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 433 | continue; |
| 434 | } |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 435 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 436 | if (parser.getName().equals(TAG_ROLE)) { |
| 437 | String roleName = parser.getAttributeValue(null, ATTRIBUTE_NAME); |
| 438 | ArraySet<String> roleHolders = parseRoleHoldersLocked(parser); |
| 439 | mRoles.put(roleName, roleHolders); |
| 440 | } |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | @NonNull |
| 445 | private ArraySet<String> parseRoleHoldersLocked(@NonNull XmlPullParser parser) |
| 446 | throws IOException, XmlPullParserException { |
| 447 | ArraySet<String> roleHolders = new ArraySet<>(); |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 448 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 449 | int type; |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 450 | int depth; |
| 451 | int innerDepth = parser.getDepth() + 1; |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 452 | while ((type = parser.next()) != XmlPullParser.END_DOCUMENT |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 453 | && ((depth = parser.getDepth()) >= innerDepth || type != XmlPullParser.END_TAG)) { |
| 454 | if (depth > innerDepth || type != XmlPullParser.START_TAG) { |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 455 | continue; |
| 456 | } |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 457 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 458 | if (parser.getName().equals(TAG_HOLDER)) { |
| 459 | String roleHolder = parser.getAttributeValue(null, ATTRIBUTE_NAME); |
| 460 | roleHolders.add(roleHolder); |
| 461 | } |
| 462 | } |
Hai Zhang | b295ac4 | 2018-11-16 16:08:18 -0800 | [diff] [blame] | 463 | |
Hai Zhang | b777668 | 2018-09-25 15:10:57 -0700 | [diff] [blame] | 464 | return roleHolders; |
| 465 | } |
| 466 | |
| 467 | /** |
| 468 | * Destroy this state and delete the corresponding file. Any pending writes to the file will be |
| 469 | * cancelled and any future interaction with this state will throw an exception. |
| 470 | */ |
| 471 | @GuardedBy("RoleManagerService.mLock") |
| 472 | public void destroySyncLocked() { |
| 473 | throwIfDestroyedLocked(); |
| 474 | mWriteHandler.removeCallbacksAndMessages(null); |
| 475 | getFile(mUserId).delete(); |
| 476 | mDestroyed = true; |
| 477 | } |
| 478 | |
| 479 | @GuardedBy("RoleManagerService.mLock") |
| 480 | private void throwIfDestroyedLocked() { |
| 481 | if (mDestroyed) { |
| 482 | throw new IllegalStateException("This RoleUserState has already been destroyed"); |
| 483 | } |
| 484 | } |
| 485 | |
| 486 | private static @NonNull File getFile(@UserIdInt int userId) { |
| 487 | return new File(Environment.getUserSystemDirectory(userId), ROLES_FILE_NAME); |
| 488 | } |
| 489 | } |