1/* 2 * Copyright (C) 2009 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 17package android.content.pm; 18 19import android.content.BroadcastReceiver; 20import android.content.ComponentName; 21import android.content.Context; 22import android.content.Intent; 23import android.content.IntentFilter; 24import android.content.pm.PackageManager.NameNotFoundException; 25import android.content.res.Resources; 26import android.content.res.XmlResourceParser; 27import android.os.Environment; 28import android.os.Handler; 29import android.os.UserHandle; 30import android.os.UserManager; 31import android.util.AtomicFile; 32import android.util.AttributeSet; 33import android.util.IntArray; 34import android.util.Log; 35import android.util.Slog; 36import android.util.SparseArray; 37import android.util.Xml; 38 39import com.android.internal.annotations.GuardedBy; 40import com.android.internal.annotations.VisibleForTesting; 41import com.android.internal.util.ArrayUtils; 42import com.android.internal.util.FastXmlSerializer; 43import com.google.android.collect.Lists; 44import com.google.android.collect.Maps; 45 46import org.xmlpull.v1.XmlPullParser; 47import org.xmlpull.v1.XmlPullParserException; 48import org.xmlpull.v1.XmlSerializer; 49 50import java.io.File; 51import java.io.FileDescriptor; 52import java.io.FileOutputStream; 53import java.io.IOException; 54import java.io.InputStream; 55import java.io.PrintWriter; 56import java.nio.charset.StandardCharsets; 57import java.util.ArrayList; 58import java.util.Arrays; 59import java.util.Collection; 60import java.util.Collections; 61import java.util.List; 62import java.util.Map; 63 64import libcore.io.IoUtils; 65 66/** 67 * Cache of registered services. This cache is lazily built by interrogating 68 * {@link PackageManager} on a per-user basis. It's updated as packages are 69 * added, removed and changed. Users are responsible for calling 70 * {@link #invalidateCache(int)} when a user is started, since 71 * {@link PackageManager} broadcasts aren't sent for stopped users. 72 * <p> 73 * The services are referred to by type V and are made available via the 74 * {@link #getServiceInfo} method. 75 * 76 * @hide 77 */ 78public abstract class RegisteredServicesCache<V> { 79 private static final String TAG = "PackageManager"; 80 private static final boolean DEBUG = false; 81 protected static final String REGISTERED_SERVICES_DIR = "registered_services"; 82 83 public final Context mContext; 84 private final String mInterfaceName; 85 private final String mMetaDataName; 86 private final String mAttributesName; 87 private final XmlSerializerAndParser<V> mSerializerAndParser; 88 89 protected final Object mServicesLock = new Object(); 90 91 @GuardedBy("mServicesLock") 92 private final SparseArray<UserServices<V>> mUserServices = new SparseArray<UserServices<V>>(2); 93 94 private static class UserServices<V> { 95 @GuardedBy("mServicesLock") 96 final Map<V, Integer> persistentServices = Maps.newHashMap(); 97 @GuardedBy("mServicesLock") 98 Map<V, ServiceInfo<V>> services = null; 99 @GuardedBy("mServicesLock") 100 boolean mPersistentServicesFileDidNotExist = true; 101 } 102 103 @GuardedBy("mServicesLock") 104 private UserServices<V> findOrCreateUserLocked(int userId) { 105 return findOrCreateUserLocked(userId, true); 106 } 107 108 @GuardedBy("mServicesLock") 109 private UserServices<V> findOrCreateUserLocked(int userId, boolean loadFromFileIfNew) { 110 UserServices<V> services = mUserServices.get(userId); 111 if (services == null) { 112 services = new UserServices<V>(); 113 mUserServices.put(userId, services); 114 if (loadFromFileIfNew && mSerializerAndParser != null) { 115 // Check if user exists and try loading data from file 116 // clear existing data if there was an error during migration 117 UserInfo user = getUser(userId); 118 if (user != null) { 119 AtomicFile file = createFileForUser(user.id); 120 if (file.getBaseFile().exists()) { 121 if (DEBUG) { 122 Slog.i(TAG, String.format("Loading u%s data from %s", user.id, file)); 123 } 124 InputStream is = null; 125 try { 126 is = file.openRead(); 127 readPersistentServicesLocked(is); 128 } catch (Exception e) { 129 Log.w(TAG, "Error reading persistent services for user " + user.id, e); 130 } finally { 131 IoUtils.closeQuietly(is); 132 } 133 } 134 } 135 } 136 } 137 return services; 138 } 139 140 // the listener and handler are synchronized on "this" and must be updated together 141 private RegisteredServicesCacheListener<V> mListener; 142 private Handler mHandler; 143 144 public RegisteredServicesCache(Context context, String interfaceName, String metaDataName, 145 String attributeName, XmlSerializerAndParser<V> serializerAndParser) { 146 mContext = context; 147 mInterfaceName = interfaceName; 148 mMetaDataName = metaDataName; 149 mAttributesName = attributeName; 150 mSerializerAndParser = serializerAndParser; 151 152 migrateIfNecessaryLocked(); 153 154 IntentFilter intentFilter = new IntentFilter(); 155 intentFilter.addAction(Intent.ACTION_PACKAGE_ADDED); 156 intentFilter.addAction(Intent.ACTION_PACKAGE_CHANGED); 157 intentFilter.addAction(Intent.ACTION_PACKAGE_REMOVED); 158 intentFilter.addDataScheme("package"); 159 mContext.registerReceiverAsUser(mPackageReceiver, UserHandle.ALL, intentFilter, null, null); 160 161 // Register for events related to sdcard installation. 162 IntentFilter sdFilter = new IntentFilter(); 163 sdFilter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE); 164 sdFilter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE); 165 mContext.registerReceiver(mExternalReceiver, sdFilter); 166 167 // Register for user-related events 168 IntentFilter userFilter = new IntentFilter(); 169 sdFilter.addAction(Intent.ACTION_USER_REMOVED); 170 mContext.registerReceiver(mUserRemovedReceiver, userFilter); 171 } 172 173 private final void handlePackageEvent(Intent intent, int userId) { 174 // Don't regenerate the services map when the package is removed or its 175 // ASEC container unmounted as a step in replacement. The subsequent 176 // _ADDED / _AVAILABLE call will regenerate the map in the final state. 177 final String action = intent.getAction(); 178 // it's a new-component action if it isn't some sort of removal 179 final boolean isRemoval = Intent.ACTION_PACKAGE_REMOVED.equals(action) 180 || Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE.equals(action); 181 // if it's a removal, is it part of an update-in-place step? 182 final boolean replacing = intent.getBooleanExtra(Intent.EXTRA_REPLACING, false); 183 184 if (isRemoval && replacing) { 185 // package is going away, but it's the middle of an upgrade: keep the current 186 // state and do nothing here. This clause is intentionally empty. 187 } else { 188 int[] uids = null; 189 // either we're adding/changing, or it's a removal without replacement, so 190 // we need to update the set of available services 191 if (Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE.equals(action) 192 || Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE.equals(action)) { 193 uids = intent.getIntArrayExtra(Intent.EXTRA_CHANGED_UID_LIST); 194 } else { 195 int uid = intent.getIntExtra(Intent.EXTRA_UID, -1); 196 if (uid > 0) { 197 uids = new int[] { uid }; 198 } 199 } 200 generateServicesMap(uids, userId); 201 } 202 } 203 204 private final BroadcastReceiver mPackageReceiver = new BroadcastReceiver() { 205 @Override 206 public void onReceive(Context context, Intent intent) { 207 final int uid = intent.getIntExtra(Intent.EXTRA_UID, -1); 208 if (uid != -1) { 209 handlePackageEvent(intent, UserHandle.getUserId(uid)); 210 } 211 } 212 }; 213 214 private final BroadcastReceiver mExternalReceiver = new BroadcastReceiver() { 215 @Override 216 public void onReceive(Context context, Intent intent) { 217 // External apps can't coexist with multi-user, so scan owner 218 handlePackageEvent(intent, UserHandle.USER_SYSTEM); 219 } 220 }; 221 222 private final BroadcastReceiver mUserRemovedReceiver = new BroadcastReceiver() { 223 @Override 224 public void onReceive(Context context, Intent intent) { 225 int userId = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, -1); 226 if (DEBUG) { 227 Slog.d(TAG, "u" + userId + " removed - cleaning up"); 228 } 229 onUserRemoved(userId); 230 } 231 }; 232 233 public void invalidateCache(int userId) { 234 synchronized (mServicesLock) { 235 final UserServices<V> user = findOrCreateUserLocked(userId); 236 user.services = null; 237 onServicesChangedLocked(userId); 238 } 239 } 240 241 public void dump(FileDescriptor fd, PrintWriter fout, String[] args, int userId) { 242 synchronized (mServicesLock) { 243 final UserServices<V> user = findOrCreateUserLocked(userId); 244 if (user.services != null) { 245 fout.println("RegisteredServicesCache: " + user.services.size() + " services"); 246 for (ServiceInfo<?> info : user.services.values()) { 247 fout.println(" " + info); 248 } 249 } else { 250 fout.println("RegisteredServicesCache: services not loaded"); 251 } 252 } 253 } 254 255 public RegisteredServicesCacheListener<V> getListener() { 256 synchronized (this) { 257 return mListener; 258 } 259 } 260 261 public void setListener(RegisteredServicesCacheListener<V> listener, Handler handler) { 262 if (handler == null) { 263 handler = new Handler(mContext.getMainLooper()); 264 } 265 synchronized (this) { 266 mHandler = handler; 267 mListener = listener; 268 } 269 } 270 271 private void notifyListener(final V type, final int userId, final boolean removed) { 272 if (DEBUG) { 273 Log.d(TAG, "notifyListener: " + type + " is " + (removed ? "removed" : "added")); 274 } 275 RegisteredServicesCacheListener<V> listener; 276 Handler handler; 277 synchronized (this) { 278 listener = mListener; 279 handler = mHandler; 280 } 281 if (listener == null) { 282 return; 283 } 284 285 final RegisteredServicesCacheListener<V> listener2 = listener; 286 handler.post(new Runnable() { 287 public void run() { 288 listener2.onServiceChanged(type, userId, removed); 289 } 290 }); 291 } 292 293 /** 294 * Value type that describes a Service. The information within can be used 295 * to bind to the service. 296 */ 297 public static class ServiceInfo<V> { 298 public final V type; 299 public final ComponentInfo componentInfo; 300 public final ComponentName componentName; 301 public final int uid; 302 303 /** @hide */ 304 public ServiceInfo(V type, ComponentInfo componentInfo, ComponentName componentName) { 305 this.type = type; 306 this.componentInfo = componentInfo; 307 this.componentName = componentName; 308 this.uid = (componentInfo != null) ? componentInfo.applicationInfo.uid : -1; 309 } 310 311 @Override 312 public String toString() { 313 return "ServiceInfo: " + type + ", " + componentName + ", uid " + uid; 314 } 315 } 316 317 /** 318 * Accessor for the registered authenticators. 319 * @param type the account type of the authenticator 320 * @return the AuthenticatorInfo that matches the account type or null if none is present 321 */ 322 public ServiceInfo<V> getServiceInfo(V type, int userId) { 323 synchronized (mServicesLock) { 324 // Find user and lazily populate cache 325 final UserServices<V> user = findOrCreateUserLocked(userId); 326 if (user.services == null) { 327 generateServicesMap(null, userId); 328 } 329 return user.services.get(type); 330 } 331 } 332 333 /** 334 * @return a collection of {@link RegisteredServicesCache.ServiceInfo} objects for all 335 * registered authenticators. 336 */ 337 public Collection<ServiceInfo<V>> getAllServices(int userId) { 338 synchronized (mServicesLock) { 339 // Find user and lazily populate cache 340 final UserServices<V> user = findOrCreateUserLocked(userId); 341 if (user.services == null) { 342 generateServicesMap(null, userId); 343 } 344 return Collections.unmodifiableCollection( 345 new ArrayList<ServiceInfo<V>>(user.services.values())); 346 } 347 } 348 349 public void updateServices(int userId) { 350 if (DEBUG) { 351 Slog.d(TAG, "updateServices u" + userId); 352 } 353 List<ServiceInfo<V>> allServices; 354 synchronized (mServicesLock) { 355 final UserServices<V> user = findOrCreateUserLocked(userId); 356 // If services haven't been initialized yet - no updates required 357 if (user.services == null) { 358 return; 359 } 360 allServices = new ArrayList<>(user.services.values()); 361 } 362 IntArray updatedUids = null; 363 for (ServiceInfo<V> service : allServices) { 364 int versionCode = service.componentInfo.applicationInfo.versionCode; 365 String pkg = service.componentInfo.packageName; 366 ApplicationInfo newAppInfo = null; 367 try { 368 newAppInfo = mContext.getPackageManager().getApplicationInfoAsUser(pkg, 0, userId); 369 } catch (NameNotFoundException e) { 370 // Package uninstalled - treat as null app info 371 } 372 // If package updated or removed 373 if ((newAppInfo == null) || (newAppInfo.versionCode != versionCode)) { 374 if (DEBUG) { 375 Slog.d(TAG, "Package " + pkg + " uid=" + service.uid 376 + " updated. New appInfo: " + newAppInfo); 377 } 378 if (updatedUids == null) { 379 updatedUids = new IntArray(); 380 } 381 updatedUids.add(service.uid); 382 } 383 } 384 if (updatedUids != null && updatedUids.size() > 0) { 385 int[] updatedUidsArray = updatedUids.toArray(); 386 generateServicesMap(updatedUidsArray, userId); 387 } 388 } 389 390 @VisibleForTesting 391 protected boolean inSystemImage(int callerUid) { 392 String[] packages = mContext.getPackageManager().getPackagesForUid(callerUid); 393 if (packages != null) { 394 for (String name : packages) { 395 try { 396 PackageInfo packageInfo = 397 mContext.getPackageManager().getPackageInfo(name, 0 /* flags */); 398 if ((packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) { 399 return true; 400 } 401 } catch (PackageManager.NameNotFoundException e) { 402 return false; 403 } 404 } 405 } 406 return false; 407 } 408 409 @VisibleForTesting 410 protected List<ResolveInfo> queryIntentServices(int userId) { 411 final PackageManager pm = mContext.getPackageManager(); 412 return pm.queryIntentServicesAsUser(new Intent(mInterfaceName), 413 PackageManager.GET_META_DATA | PackageManager.MATCH_DIRECT_BOOT_AWARE 414 | PackageManager.MATCH_DIRECT_BOOT_UNAWARE, 415 userId); 416 } 417 418 /** 419 * Populate {@link UserServices#services} by scanning installed packages for 420 * given {@link UserHandle}. 421 * @param changedUids the array of uids that have been affected, as mentioned in the broadcast 422 * or null to assume that everything is affected. 423 * @param userId the user for whom to update the services map. 424 */ 425 private void generateServicesMap(int[] changedUids, int userId) { 426 if (DEBUG) { 427 Slog.d(TAG, "generateServicesMap() for " + userId + ", changed UIDs = " 428 + Arrays.toString(changedUids)); 429 } 430 431 final ArrayList<ServiceInfo<V>> serviceInfos = new ArrayList<>(); 432 final List<ResolveInfo> resolveInfos = queryIntentServices(userId); 433 for (ResolveInfo resolveInfo : resolveInfos) { 434 try { 435 ServiceInfo<V> info = parseServiceInfo(resolveInfo); 436 if (info == null) { 437 Log.w(TAG, "Unable to load service info " + resolveInfo.toString()); 438 continue; 439 } 440 serviceInfos.add(info); 441 } catch (XmlPullParserException|IOException e) { 442 Log.w(TAG, "Unable to load service info " + resolveInfo.toString(), e); 443 } 444 } 445 446 synchronized (mServicesLock) { 447 final UserServices<V> user = findOrCreateUserLocked(userId); 448 final boolean firstScan = user.services == null; 449 if (firstScan) { 450 user.services = Maps.newHashMap(); 451 } 452 453 StringBuilder changes = new StringBuilder(); 454 boolean changed = false; 455 for (ServiceInfo<V> info : serviceInfos) { 456 // four cases: 457 // - doesn't exist yet 458 // - add, notify user that it was added 459 // - exists and the UID is the same 460 // - replace, don't notify user 461 // - exists, the UID is different, and the new one is not a system package 462 // - ignore 463 // - exists, the UID is different, and the new one is a system package 464 // - add, notify user that it was added 465 Integer previousUid = user.persistentServices.get(info.type); 466 if (previousUid == null) { 467 if (DEBUG) { 468 changes.append(" New service added: ").append(info).append("\n"); 469 } 470 changed = true; 471 user.services.put(info.type, info); 472 user.persistentServices.put(info.type, info.uid); 473 if (!(user.mPersistentServicesFileDidNotExist && firstScan)) { 474 notifyListener(info.type, userId, false /* removed */); 475 } 476 } else if (previousUid == info.uid) { 477 if (DEBUG) { 478 changes.append(" Existing service (nop): ").append(info).append("\n"); 479 } 480 user.services.put(info.type, info); 481 } else if (inSystemImage(info.uid) 482 || !containsTypeAndUid(serviceInfos, info.type, previousUid)) { 483 if (DEBUG) { 484 if (inSystemImage(info.uid)) { 485 changes.append(" System service replacing existing: ").append(info) 486 .append("\n"); 487 } else { 488 changes.append(" Existing service replacing a removed service: ") 489 .append(info).append("\n"); 490 } 491 } 492 changed = true; 493 user.services.put(info.type, info); 494 user.persistentServices.put(info.type, info.uid); 495 notifyListener(info.type, userId, false /* removed */); 496 } else { 497 // ignore 498 if (DEBUG) { 499 changes.append(" Existing service with new uid ignored: ").append(info) 500 .append("\n"); 501 } 502 } 503 } 504 505 ArrayList<V> toBeRemoved = Lists.newArrayList(); 506 for (V v1 : user.persistentServices.keySet()) { 507 // Remove a persisted service that's not in the currently available services list. 508 // And only if it is in the list of changedUids. 509 if (!containsType(serviceInfos, v1) 510 && containsUid(changedUids, user.persistentServices.get(v1))) { 511 toBeRemoved.add(v1); 512 } 513 } 514 for (V v1 : toBeRemoved) { 515 if (DEBUG) { 516 changes.append(" Service removed: ").append(v1).append("\n"); 517 } 518 changed = true; 519 user.persistentServices.remove(v1); 520 user.services.remove(v1); 521 notifyListener(v1, userId, true /* removed */); 522 } 523 if (DEBUG) { 524 Log.d(TAG, "user.services="); 525 for (V v : user.services.keySet()) { 526 Log.d(TAG, " " + v + " " + user.services.get(v)); 527 } 528 Log.d(TAG, "user.persistentServices="); 529 for (V v : user.persistentServices.keySet()) { 530 Log.d(TAG, " " + v + " " + user.persistentServices.get(v)); 531 } 532 } 533 if (DEBUG) { 534 if (changes.length() > 0) { 535 Log.d(TAG, "generateServicesMap(" + mInterfaceName + "): " + 536 serviceInfos.size() + " services:\n" + changes); 537 } else { 538 Log.d(TAG, "generateServicesMap(" + mInterfaceName + "): " + 539 serviceInfos.size() + " services unchanged"); 540 } 541 } 542 if (changed) { 543 onServicesChangedLocked(userId); 544 writePersistentServicesLocked(user, userId); 545 } 546 } 547 } 548 549 protected void onServicesChangedLocked(int userId) { 550 // Feel free to override 551 } 552 553 /** 554 * Returns true if the list of changed uids is null (wildcard) or the specified uid 555 * is contained in the list of changed uids. 556 */ 557 private boolean containsUid(int[] changedUids, int uid) { 558 return changedUids == null || ArrayUtils.contains(changedUids, uid); 559 } 560 561 private boolean containsType(ArrayList<ServiceInfo<V>> serviceInfos, V type) { 562 for (int i = 0, N = serviceInfos.size(); i < N; i++) { 563 if (serviceInfos.get(i).type.equals(type)) { 564 return true; 565 } 566 } 567 568 return false; 569 } 570 571 private boolean containsTypeAndUid(ArrayList<ServiceInfo<V>> serviceInfos, V type, int uid) { 572 for (int i = 0, N = serviceInfos.size(); i < N; i++) { 573 final ServiceInfo<V> serviceInfo = serviceInfos.get(i); 574 if (serviceInfo.type.equals(type) && serviceInfo.uid == uid) { 575 return true; 576 } 577 } 578 579 return false; 580 } 581 582 @VisibleForTesting 583 protected ServiceInfo<V> parseServiceInfo(ResolveInfo service) 584 throws XmlPullParserException, IOException { 585 android.content.pm.ServiceInfo si = service.serviceInfo; 586 ComponentName componentName = new ComponentName(si.packageName, si.name); 587 588 PackageManager pm = mContext.getPackageManager(); 589 590 XmlResourceParser parser = null; 591 try { 592 parser = si.loadXmlMetaData(pm, mMetaDataName); 593 if (parser == null) { 594 throw new XmlPullParserException("No " + mMetaDataName + " meta-data"); 595 } 596 597 AttributeSet attrs = Xml.asAttributeSet(parser); 598 599 int type; 600 while ((type=parser.next()) != XmlPullParser.END_DOCUMENT 601 && type != XmlPullParser.START_TAG) { 602 } 603 604 String nodeName = parser.getName(); 605 if (!mAttributesName.equals(nodeName)) { 606 throw new XmlPullParserException( 607 "Meta-data does not start with " + mAttributesName + " tag"); 608 } 609 610 V v = parseServiceAttributes(pm.getResourcesForApplication(si.applicationInfo), 611 si.packageName, attrs); 612 if (v == null) { 613 return null; 614 } 615 final android.content.pm.ServiceInfo serviceInfo = service.serviceInfo; 616 return new ServiceInfo<V>(v, serviceInfo, componentName); 617 } catch (NameNotFoundException e) { 618 throw new XmlPullParserException( 619 "Unable to load resources for pacakge " + si.packageName); 620 } finally { 621 if (parser != null) parser.close(); 622 } 623 } 624 625 /** 626 * Read all sync status back in to the initial engine state. 627 */ 628 private void readPersistentServicesLocked(InputStream is) 629 throws XmlPullParserException, IOException { 630 XmlPullParser parser = Xml.newPullParser(); 631 parser.setInput(is, StandardCharsets.UTF_8.name()); 632 int eventType = parser.getEventType(); 633 while (eventType != XmlPullParser.START_TAG 634 && eventType != XmlPullParser.END_DOCUMENT) { 635 eventType = parser.next(); 636 } 637 String tagName = parser.getName(); 638 if ("services".equals(tagName)) { 639 eventType = parser.next(); 640 do { 641 if (eventType == XmlPullParser.START_TAG && parser.getDepth() == 2) { 642 tagName = parser.getName(); 643 if ("service".equals(tagName)) { 644 V service = mSerializerAndParser.createFromXml(parser); 645 if (service == null) { 646 break; 647 } 648 String uidString = parser.getAttributeValue(null, "uid"); 649 final int uid = Integer.parseInt(uidString); 650 final int userId = UserHandle.getUserId(uid); 651 final UserServices<V> user = findOrCreateUserLocked(userId, 652 false /*loadFromFileIfNew*/) ; 653 user.persistentServices.put(service, uid); 654 } 655 } 656 eventType = parser.next(); 657 } while (eventType != XmlPullParser.END_DOCUMENT); 658 } 659 } 660 661 private void migrateIfNecessaryLocked() { 662 if (mSerializerAndParser == null) { 663 return; 664 } 665 File systemDir = new File(getDataDirectory(), "system"); 666 File syncDir = new File(systemDir, REGISTERED_SERVICES_DIR); 667 AtomicFile oldFile = new AtomicFile(new File(syncDir, mInterfaceName + ".xml")); 668 boolean oldFileExists = oldFile.getBaseFile().exists(); 669 670 if (oldFileExists) { 671 File marker = new File(syncDir, mInterfaceName + ".xml.migrated"); 672 // if not migrated, perform the migration and add a marker 673 if (!marker.exists()) { 674 if (DEBUG) { 675 Slog.i(TAG, "Marker file " + marker + " does not exist - running migration"); 676 } 677 InputStream is = null; 678 try { 679 is = oldFile.openRead(); 680 mUserServices.clear(); 681 readPersistentServicesLocked(is); 682 } catch (Exception e) { 683 Log.w(TAG, "Error reading persistent services, starting from scratch", e); 684 } finally { 685 IoUtils.closeQuietly(is); 686 } 687 try { 688 for (UserInfo user : getUsers()) { 689 UserServices<V> userServices = mUserServices.get(user.id); 690 if (userServices != null) { 691 if (DEBUG) { 692 Slog.i(TAG, "Migrating u" + user.id + " services " 693 + userServices.persistentServices); 694 } 695 writePersistentServicesLocked(userServices, user.id); 696 } 697 } 698 marker.createNewFile(); 699 } catch (Exception e) { 700 Log.w(TAG, "Migration failed", e); 701 } 702 // Migration is complete and we don't need to keep data for all users anymore, 703 // It will be loaded from a new location when requested 704 mUserServices.clear(); 705 } 706 } 707 } 708 709 /** 710 * Writes services of a specified user to the file. 711 */ 712 private void writePersistentServicesLocked(UserServices<V> user, int userId) { 713 if (mSerializerAndParser == null) { 714 return; 715 } 716 AtomicFile atomicFile = createFileForUser(userId); 717 FileOutputStream fos = null; 718 try { 719 fos = atomicFile.startWrite(); 720 XmlSerializer out = new FastXmlSerializer(); 721 out.setOutput(fos, StandardCharsets.UTF_8.name()); 722 out.startDocument(null, true); 723 out.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 724 out.startTag(null, "services"); 725 for (Map.Entry<V, Integer> service : user.persistentServices.entrySet()) { 726 out.startTag(null, "service"); 727 out.attribute(null, "uid", Integer.toString(service.getValue())); 728 mSerializerAndParser.writeAsXml(service.getKey(), out); 729 out.endTag(null, "service"); 730 } 731 out.endTag(null, "services"); 732 out.endDocument(); 733 atomicFile.finishWrite(fos); 734 } catch (IOException e1) { 735 Log.w(TAG, "Error writing accounts", e1); 736 if (fos != null) { 737 atomicFile.failWrite(fos); 738 } 739 } 740 } 741 742 @VisibleForTesting 743 protected void onUserRemoved(int userId) { 744 synchronized (mServicesLock) { 745 mUserServices.remove(userId); 746 } 747 } 748 749 @VisibleForTesting 750 protected List<UserInfo> getUsers() { 751 return UserManager.get(mContext).getUsers(true); 752 } 753 754 @VisibleForTesting 755 protected UserInfo getUser(int userId) { 756 return UserManager.get(mContext).getUserInfo(userId); 757 } 758 759 private AtomicFile createFileForUser(int userId) { 760 File userDir = getUserSystemDirectory(userId); 761 File userFile = new File(userDir, REGISTERED_SERVICES_DIR + "/" + mInterfaceName + ".xml"); 762 return new AtomicFile(userFile); 763 } 764 765 @VisibleForTesting 766 protected File getUserSystemDirectory(int userId) { 767 return Environment.getUserSystemDirectory(userId); 768 } 769 770 @VisibleForTesting 771 protected File getDataDirectory() { 772 return Environment.getDataDirectory(); 773 } 774 775 @VisibleForTesting 776 protected Map<V, Integer> getPersistentServices(int userId) { 777 return findOrCreateUserLocked(userId).persistentServices; 778 } 779 780 public abstract V parseServiceAttributes(Resources res, 781 String packageName, AttributeSet attrs); 782} 783