/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ package org.mozilla.gecko.sync; import java.io.IOException; import java.net.URI; import java.net.URISyntaxException; import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.util.Set; import java.util.concurrent.atomic.AtomicLong; import org.json.simple.parser.ParseException; import org.mozilla.gecko.sync.crypto.CryptoException; import org.mozilla.gecko.sync.crypto.KeyBundle; import org.mozilla.gecko.sync.delegates.ClientsDataDelegate; import org.mozilla.gecko.sync.delegates.FreshStartDelegate; import org.mozilla.gecko.sync.delegates.GlobalSessionCallback; import org.mozilla.gecko.sync.delegates.JSONRecordFetchDelegate; import org.mozilla.gecko.sync.delegates.KeyUploadDelegate; import org.mozilla.gecko.sync.delegates.MetaGlobalDelegate; import org.mozilla.gecko.sync.delegates.WipeServerDelegate; import org.mozilla.gecko.sync.net.BaseResource; import org.mozilla.gecko.sync.net.HttpResponseObserver; import org.mozilla.gecko.sync.net.SyncResponse; import org.mozilla.gecko.sync.net.SyncStorageRecordRequest; import org.mozilla.gecko.sync.net.SyncStorageRequest; import org.mozilla.gecko.sync.net.SyncStorageRequestDelegate; import org.mozilla.gecko.sync.net.SyncStorageResponse; import org.mozilla.gecko.sync.stage.AndroidBrowserBookmarksServerSyncStage; import org.mozilla.gecko.sync.stage.AndroidBrowserHistoryServerSyncStage; import org.mozilla.gecko.sync.stage.CheckPreconditionsStage; import org.mozilla.gecko.sync.stage.CompletedStage; import org.mozilla.gecko.sync.stage.EnsureClusterURLStage; import org.mozilla.gecko.sync.stage.EnsureCrypto5KeysStage; import org.mozilla.gecko.sync.stage.FennecTabsServerSyncStage; import org.mozilla.gecko.sync.stage.FetchInfoCollectionsStage; import org.mozilla.gecko.sync.stage.FetchMetaGlobalStage; import org.mozilla.gecko.sync.stage.FormHistoryServerSyncStage; import org.mozilla.gecko.sync.stage.GlobalSyncStage; import org.mozilla.gecko.sync.stage.GlobalSyncStage.Stage; import org.mozilla.gecko.sync.stage.NoSuchStageException; import org.mozilla.gecko.sync.stage.PasswordsServerSyncStage; import org.mozilla.gecko.sync.stage.SyncClientsEngineStage; import org.mozilla.gecko.sync.stage.UploadMetaGlobalStage; import android.content.Context; import android.content.SharedPreferences; import android.os.Bundle; import ch.boye.httpclientandroidlib.HttpResponse; public class GlobalSession implements CredentialsSource, PrefsSource, HttpResponseObserver { private static final String LOG_TAG = "GlobalSession"; public static final String API_VERSION = "1.1"; public static final long STORAGE_VERSION = 5; public SyncConfiguration config = null; protected Map stages; public Stage currentState = Stage.idle; public final GlobalSessionCallback callback; private Context context; private ClientsDataDelegate clientsDelegate; /** * Map from engine name to new settings for an updated meta/global record. * Engines to remove will have null EngineSettings. */ public final Map enginesToUpdate = new HashMap(); /* * Key accessors. */ public KeyBundle keyBundleForCollection(String collection) throws NoCollectionKeysSetException { return config.getCollectionKeys().keyBundleForCollection(collection); } /* * Config passthrough for convenience. */ @Override public String credentials() { return config.credentials(); } public URI wboURI(String collection, String id) throws URISyntaxException { return config.wboURI(collection, id); } /* * Validators. */ private static boolean isInvalidString(String s) { return s == null || s.trim().length() == 0; } private static boolean anyInvalidStrings(String s, String...strings) { if (isInvalidString(s)) { return true; } for (String str : strings) { if (isInvalidString(str)) { return true; } } return false; } public GlobalSession(String userAPI, String serverURL, String username, String password, String prefsPath, KeyBundle syncKeyBundle, GlobalSessionCallback callback, Context context, Bundle extras, ClientsDataDelegate clientsDelegate) throws SyncConfigurationException, IllegalArgumentException, IOException, ParseException, NonObjectJSONException { if (callback == null) { throw new IllegalArgumentException("Must provide a callback to GlobalSession constructor."); } if (anyInvalidStrings(username, password)) { throw new SyncConfigurationException(); } Logger.debug(LOG_TAG, "GlobalSession initialized with bundle " + extras); URI serverURI; try { serverURI = (serverURL == null) ? null : new URI(serverURL); } catch (URISyntaxException e) { throw new SyncConfigurationException(); } if (syncKeyBundle == null || syncKeyBundle.getEncryptionKey() == null || syncKeyBundle.getHMACKey() == null) { throw new SyncConfigurationException(); } this.callback = callback; this.context = context; this.clientsDelegate = clientsDelegate; config = new SyncConfiguration(prefsPath, this); config.userAPI = userAPI; config.serverURL = serverURI; config.username = username; config.password = password; config.syncKeyBundle = syncKeyBundle; registerCommands(); prepareStages(); Collection knownStageNames = SyncConfiguration.validEngineNames(); config.stagesToSync = Utils.getStagesToSyncFromBundle(knownStageNames, extras); // TODO: data-driven plan for the sync, referring to prepareStages. } /** * Register commands this global session knows how to process. *

* Re-registering a command overwrites any existing registration. */ protected static void registerCommands() { final CommandProcessor processor = CommandProcessor.getProcessor(); processor.registerCommand("resetEngine", new CommandRunner(1) { @Override public void executeCommand(final GlobalSession session, List args) { HashSet names = new HashSet(); names.add(args.get(0)); session.resetStagesByName(names); } }); processor.registerCommand("resetAll", new CommandRunner(0) { @Override public void executeCommand(final GlobalSession session, List args) { session.resetAllStages(); } }); processor.registerCommand("wipeEngine", new CommandRunner(1) { @Override public void executeCommand(final GlobalSession session, List args) { HashSet names = new HashSet(); names.add(args.get(0)); session.wipeStagesByName(names); } }); processor.registerCommand("wipeAll", new CommandRunner(0) { @Override public void executeCommand(final GlobalSession session, List args) { session.wipeAllStages(); } }); processor.registerCommand("displayURI", new CommandRunner(3) { @Override public void executeCommand(final GlobalSession session, List args) { CommandProcessor.displayURI(args, session.getContext()); } }); } protected void prepareStages() { HashMap stages = new HashMap(); stages.put(Stage.checkPreconditions, new CheckPreconditionsStage(this)); stages.put(Stage.ensureClusterURL, new EnsureClusterURLStage(this)); stages.put(Stage.fetchInfoCollections, new FetchInfoCollectionsStage(this)); stages.put(Stage.fetchMetaGlobal, new FetchMetaGlobalStage(this)); stages.put(Stage.ensureKeysStage, new EnsureCrypto5KeysStage(this)); stages.put(Stage.syncClientsEngine, new SyncClientsEngineStage(this)); stages.put(Stage.syncTabs, new FennecTabsServerSyncStage(this)); stages.put(Stage.syncPasswords, new PasswordsServerSyncStage(this)); stages.put(Stage.syncBookmarks, new AndroidBrowserBookmarksServerSyncStage(this)); stages.put(Stage.syncHistory, new AndroidBrowserHistoryServerSyncStage(this)); stages.put(Stage.syncFormHistory, new FormHistoryServerSyncStage(this)); stages.put(Stage.uploadMetaGlobal, new UploadMetaGlobalStage(this)); stages.put(Stage.completed, new CompletedStage(this)); this.stages = Collections.unmodifiableMap(stages); } public GlobalSyncStage getSyncStageByName(String name) throws NoSuchStageException { return getSyncStageByName(Stage.byName(name)); } public GlobalSyncStage getSyncStageByName(Stage next) throws NoSuchStageException { GlobalSyncStage stage = stages.get(next); if (stage == null) { throw new NoSuchStageException(next); } return stage; } public Collection getSyncStagesByEnum(Collection enums) { ArrayList out = new ArrayList(); for (Stage name : enums) { try { GlobalSyncStage stage = this.getSyncStageByName(name); out.add(stage); } catch (NoSuchStageException e) { Logger.warn(LOG_TAG, "Unable to find stage with name " + name); } } return out; } public Collection getSyncStagesByName(Collection names) { ArrayList out = new ArrayList(); for (String name : names) { try { GlobalSyncStage stage = this.getSyncStageByName(name); out.add(stage); } catch (NoSuchStageException e) { Logger.warn(LOG_TAG, "Unable to find stage with name " + name); } } return out; } /** * Advance and loop around the stages of a sync. * @param current * @return * The next stage to execute. */ public static Stage nextStage(Stage current) { int index = current.ordinal() + 1; int max = Stage.completed.ordinal() + 1; return Stage.values()[index % max]; } /** * Move to the next stage in the syncing process. */ public void advance() { // If we have a backoff, request a backoff and don't advance to next stage. long existingBackoff = largestBackoffObserved.get(); if (existingBackoff > 0) { this.abort(null, "Aborting sync because of backoff of " + existingBackoff + " milliseconds."); return; } this.callback.handleStageCompleted(this.currentState, this); Stage next = nextStage(this.currentState); GlobalSyncStage nextStage; try { nextStage = this.getSyncStageByName(next); } catch (NoSuchStageException e) { this.abort(e, "No such stage " + next); return; } this.currentState = next; Logger.info(LOG_TAG, "Running next stage " + next + " (" + nextStage + ")..."); try { nextStage.execute(); } catch (Exception ex) { Logger.warn(LOG_TAG, "Caught exception " + ex + " running stage " + next); this.abort(ex, "Uncaught exception in stage."); return; } } /* * PrefsSource methods. */ @Override public SharedPreferences getPrefs(String name, int mode) { return this.getContext().getSharedPreferences(name, mode); } public Context getContext() { return this.context; } /** * Begin a sync. *

* The caller is responsible for: *

    *
  • Verifying that any backoffs/minimum next sync requests are respected.
    • *
  • Ensuring that the device is online.
    • *
  • Ensuring that dependencies are ready.
    • *
* * @throws AlreadySyncingException */ public void start() throws AlreadySyncingException { if (this.currentState != GlobalSyncStage.Stage.idle) { throw new AlreadySyncingException(this.currentState); } installAsHttpResponseObserver(); // Uninstalled by completeSync or abort. this.advance(); } /** * Stop this sync and start again. * @throws AlreadySyncingException */ protected void restart() throws AlreadySyncingException { this.currentState = GlobalSyncStage.Stage.idle; if (callback.shouldBackOff()) { this.callback.handleAborted(this, "Told to back off."); return; } this.start(); } /** * We're finished (aborted or succeeded): release resources. */ protected void cleanUp() { uninstallAsHttpResponseObserver(); this.stages = null; } public void completeSync() { cleanUp(); this.currentState = GlobalSyncStage.Stage.idle; this.callback.handleSuccess(this); } /** * Record that an updated meta/global record should be uploaded with the given * settings for the given engine. * * @param engineName engine to update. * @param engineSettings new syncID and version. */ public void recordForMetaGlobalUpdate(String engineName, EngineSettings engineSettings) { enginesToUpdate.put(engineName, engineSettings); } /** * Record that an updated meta/global record should be uploaded without the * given engine name. * * @param engineName * engine to remove. */ public void removeEngineFromMetaGlobal(String engineName) { enginesToUpdate.put(engineName, null); } public boolean hasUpdatedMetaGlobal() { if (enginesToUpdate.isEmpty()) { Logger.info(LOG_TAG, "Not uploading updated meta/global record since there are no engines requesting upload."); return false; } if (Logger.shouldLogVerbose(LOG_TAG)) { Logger.trace(LOG_TAG, "Uploading updated meta/global record since there are engine changes to meta/global."); Logger.trace(LOG_TAG, "Engines requesting update [" + Utils.toCommaSeparatedString(enginesToUpdate.keySet()) + "]"); } return true; } public void updateMetaGlobalInPlace() { ExtendedJSONObject engines = config.metaGlobal.getEngines(); for (Entry pair : enginesToUpdate.entrySet()) { if (pair.getValue() == null) { engines.remove(pair.getKey()); } else { engines.put(pair.getKey(), pair.getValue().toJSONObject()); } } enginesToUpdate.clear(); } /** * Synchronously upload an updated meta/global. *

* All problems are logged and ignored. */ public void uploadUpdatedMetaGlobal() { updateMetaGlobalInPlace(); Logger.debug(LOG_TAG, "Uploading updated meta/global record."); final Object monitor = new Object(); Runnable doUpload = new Runnable() { @Override public void run() { config.metaGlobal.upload(new MetaGlobalDelegate() { @Override public void handleSuccess(MetaGlobal global, SyncStorageResponse response) { Logger.info(LOG_TAG, "Successfully uploaded updated meta/global record."); // Engine changes are stored as diffs, so update enabled engines in config to match uploaded meta/global. config.enabledEngineNames = config.metaGlobal.getEnabledEngineNames(); // Clear userSelectedEngines because they are updated in config and meta/global. config.userSelectedEngines = null; synchronized (monitor) { monitor.notify(); } } @Override public void handleMissing(MetaGlobal global, SyncStorageResponse response) { Logger.warn(LOG_TAG, "Got 404 missing uploading updated meta/global record; shouldn't happen. Ignoring."); synchronized (monitor) { monitor.notify(); } } @Override public void handleFailure(SyncStorageResponse response) { Logger.warn(LOG_TAG, "Failed to upload updated meta/global record; ignoring."); synchronized (monitor) { monitor.notify(); } } @Override public void handleError(Exception e) { Logger.warn(LOG_TAG, "Got exception trying to upload updated meta/global record; ignoring.", e); synchronized (monitor) { monitor.notify(); } } }); } }; final Thread upload = new Thread(doUpload); synchronized (monitor) { try { upload.start(); monitor.wait(); Logger.debug(LOG_TAG, "Uploaded updated meta/global record."); } catch (InterruptedException e) { Logger.error(LOG_TAG, "Uploading updated meta/global interrupted; continuing."); } } } public void abort(Exception e, String reason) { Logger.warn(LOG_TAG, "Aborting sync: " + reason, e); cleanUp(); long existingBackoff = largestBackoffObserved.get(); if (existingBackoff > 0) { callback.requestBackoff(existingBackoff); } if (!(e instanceof HTTPFailureException)) { // e is null, or we aborted for a non-HTTP reason; okay to upload new meta/global record. if (this.hasUpdatedMetaGlobal()) { this.uploadUpdatedMetaGlobal(); // Only logs errors; does not call abort. } } this.callback.handleError(this, e); } public void handleHTTPError(SyncStorageResponse response, String reason) { // TODO: handling of 50x (backoff), 401 (node reassignment or auth error). // Fall back to aborting. Logger.warn(LOG_TAG, "Aborting sync due to HTTP " + response.getStatusCode()); this.interpretHTTPFailure(response.httpResponse()); this.abort(new HTTPFailureException(response), reason); } /** * Perform appropriate backoff etc. extraction. */ public void interpretHTTPFailure(HttpResponse response) { // TODO: handle permanent rejection. long responseBackoff = (new SyncResponse(response)).totalBackoffInMilliseconds(); if (responseBackoff > 0) { callback.requestBackoff(responseBackoff); } if (response.getStatusLine() != null) { final int statusCode = response.getStatusLine().getStatusCode(); switch(statusCode) { case 400: SyncStorageResponse storageResponse = new SyncStorageResponse(response); this.interpretHTTPBadRequestBody(storageResponse); break; case 401: /* * Alert our callback we have a 401 on a cluster URL. This GlobalSession * will fail, but the next one will fetch a new cluster URL and will * distinguish between "node reassignment" and "user password changed". */ callback.informUnauthorizedResponse(this, config.getClusterURL()); break; } } } protected void interpretHTTPBadRequestBody(final SyncStorageResponse storageResponse) { try { final String body = storageResponse.body(); if (body == null) { return; } if (SyncStorageResponse.RESPONSE_CLIENT_UPGRADE_REQUIRED.equals(body)) { callback.informUpgradeRequiredResponse(this); return; } } catch (Exception e) { Logger.warn(LOG_TAG, "Exception parsing HTTP 400 body.", e); } } public void fetchInfoCollections(JSONRecordFetchDelegate callback) throws URISyntaxException { final JSONRecordFetcher fetcher = new JSONRecordFetcher(config.infoCollectionsURL(), credentials()); fetcher.fetch(callback); } /** * Upload new crypto/keys. * * @param keys * new keys. * @param keyUploadDelegate * a delegate. */ public void uploadKeys(final CollectionKeys keys, final KeyUploadDelegate keyUploadDelegate) { SyncStorageRecordRequest request; final GlobalSession self = this; try { request = new SyncStorageRecordRequest(this.config.keysURI()); } catch (URISyntaxException e) { keyUploadDelegate.onKeyUploadFailed(e); return; } request.delegate = new SyncStorageRequestDelegate() { @Override public String ifUnmodifiedSince() { return null; } @Override public void handleRequestSuccess(SyncStorageResponse response) { Logger.debug(LOG_TAG, "Keys uploaded."); BaseResource.consumeEntity(response); // We don't need the response at all. keyUploadDelegate.onKeysUploaded(); } @Override public void handleRequestFailure(SyncStorageResponse response) { Logger.debug(LOG_TAG, "Failed to upload keys."); self.interpretHTTPFailure(response.httpResponse()); BaseResource.consumeEntity(response); // The exception thrown should not need the body of the response. keyUploadDelegate.onKeyUploadFailed(new HTTPFailureException(response)); } @Override public void handleRequestError(Exception ex) { Logger.warn(LOG_TAG, "Got exception trying to upload keys", ex); keyUploadDelegate.onKeyUploadFailed(ex); } @Override public String credentials() { return self.credentials(); } }; // Convert keys to an encrypted crypto record. CryptoRecord keysRecord; try { keysRecord = keys.asCryptoRecord(); keysRecord.setKeyBundle(config.syncKeyBundle); keysRecord.encrypt(); } catch (Exception e) { Logger.warn(LOG_TAG, "Got exception trying creating crypto record from keys", e); keyUploadDelegate.onKeyUploadFailed(e); return; } request.put(keysRecord); } /* * meta/global callbacks. */ public void processMetaGlobal(MetaGlobal global) { config.metaGlobal = global; Long storageVersion = global.getStorageVersion(); if (storageVersion == null) { Logger.warn(LOG_TAG, "Malformed remote meta/global: could not retrieve remote storage version."); freshStart(); return; } if (storageVersion < STORAGE_VERSION) { Logger.warn(LOG_TAG, "Outdated server: reported " + "remote storage version " + storageVersion + " < " + "local storage version " + STORAGE_VERSION); freshStart(); return; } if (storageVersion > STORAGE_VERSION) { Logger.warn(LOG_TAG, "Outdated client: reported " + "remote storage version " + storageVersion + " > " + "local storage version " + STORAGE_VERSION); requiresUpgrade(); return; } String remoteSyncID = global.getSyncID(); if (remoteSyncID == null) { Logger.warn(LOG_TAG, "Malformed remote meta/global: could not retrieve remote syncID."); freshStart(); return; } String localSyncID = config.syncID; if (!remoteSyncID.equals(localSyncID)) { Logger.warn(LOG_TAG, "Remote syncID different from local syncID: resetting client and assuming remote syncID."); resetAllStages(); config.purgeCryptoKeys(); config.syncID = remoteSyncID; } // Compare lastModified timestamps for remote/local engine selection times. Logger.debug(LOG_TAG, "Comparing local engine selection timestamp [" + config.userSelectedEnginesTimestamp + "] to server meta/global timestamp [" + config.persistedMetaGlobal().lastModified() + "]."); if (config.userSelectedEnginesTimestamp < config.persistedMetaGlobal().lastModified()) { // Remote has later meta/global timestamp. Don't upload engine changes. config.userSelectedEngines = null; } // Persist enabled engine names. config.enabledEngineNames = global.getEnabledEngineNames(); if (config.enabledEngineNames == null) { Logger.warn(LOG_TAG, "meta/global reported no enabled engine names!"); } else { if (Logger.shouldLogVerbose(LOG_TAG)) { Logger.trace(LOG_TAG, "Persisting enabled engine names '" + Utils.toCommaSeparatedString(config.enabledEngineNames) + "' from meta/global."); } } config.persistToPrefs(); advance(); } public void processMissingMetaGlobal(MetaGlobal global) { freshStart(); } /** * Do a fresh start then quietly finish the sync, starting another. */ public void freshStart() { final GlobalSession globalSession = this; freshStart(this, new FreshStartDelegate() { @Override public void onFreshStartFailed(Exception e) { globalSession.abort(e, "Fresh start failed."); } @Override public void onFreshStart() { try { Logger.warn(LOG_TAG, "Fresh start succeeded; restarting global session."); globalSession.config.persistToPrefs(); globalSession.restart(); } catch (Exception e) { Logger.warn(LOG_TAG, "Got exception when restarting sync after freshStart.", e); globalSession.abort(e, "Got exception after freshStart."); } } }); } /** * Clean the server, aborting the current sync. *

*

    *
  1. Wipe the server storage.
    2. *
  2. Reset all stages and purge cached state: (meta/global and crypto/keys records).
    3. *
  3. Upload fresh meta/global record.
    4. *
  4. Upload fresh crypto/keys record.
    5. *
  5. Restart the sync entirely in order to re-download meta/global and crypto/keys record.
    6. *
* @param session the current session. * @param freshStartDelegate delegate to notify on fresh start or failure. */ protected static void freshStart(final GlobalSession session, final FreshStartDelegate freshStartDelegate) { Logger.debug(LOG_TAG, "Fresh starting."); final MetaGlobal mg = session.generateNewMetaGlobal(); session.wipeServer(session, new WipeServerDelegate() { @Override public void onWiped(long timestamp) { Logger.debug(LOG_TAG, "Successfully wiped server. Resetting all stages and purging cached meta/global and crypto/keys records."); session.resetAllStages(); session.config.purgeMetaGlobal(); session.config.purgeCryptoKeys(); session.config.persistToPrefs(); Logger.info(LOG_TAG, "Uploading new meta/global with sync ID " + mg.syncID + "."); // It would be good to set the X-If-Unmodified-Since header to `timestamp` // for this PUT to ensure at least some level of transactionality. // Unfortunately, the servers don't support it after a wipe right now // (bug 693893), so we're going to defer this until bug 692700. mg.upload(new MetaGlobalDelegate() { @Override public void handleSuccess(MetaGlobal uploadedGlobal, SyncStorageResponse uploadResponse) { Logger.info(LOG_TAG, "Uploaded new meta/global with sync ID " + uploadedGlobal.syncID + "."); // Generate new keys. CollectionKeys keys = null; try { keys = session.generateNewCryptoKeys(); } catch (CryptoException e) { Logger.warn(LOG_TAG, "Got exception generating new keys; failing fresh start.", e); freshStartDelegate.onFreshStartFailed(e); } if (keys == null) { Logger.warn(LOG_TAG, "Got null keys from generateNewKeys; failing fresh start."); freshStartDelegate.onFreshStartFailed(null); } // Upload new keys. Logger.info(LOG_TAG, "Uploading new crypto/keys."); session.uploadKeys(keys, new KeyUploadDelegate() { @Override public void onKeysUploaded() { Logger.info(LOG_TAG, "Uploaded new crypto/keys."); freshStartDelegate.onFreshStart(); } @Override public void onKeyUploadFailed(Exception e) { Logger.warn(LOG_TAG, "Got exception uploading new keys.", e); freshStartDelegate.onFreshStartFailed(e); } }); } @Override public void handleMissing(MetaGlobal global, SyncStorageResponse response) { // Shouldn't happen on upload. Logger.warn(LOG_TAG, "Got 'missing' response uploading new meta/global."); freshStartDelegate.onFreshStartFailed(new Exception("meta/global missing while uploading.")); } @Override public void handleFailure(SyncStorageResponse response) { Logger.warn(LOG_TAG, "Got failure " + response.getStatusCode() + " uploading new meta/global."); session.interpretHTTPFailure(response.httpResponse()); freshStartDelegate.onFreshStartFailed(new HTTPFailureException(response)); } @Override public void handleError(Exception e) { Logger.warn(LOG_TAG, "Got error uploading new meta/global.", e); freshStartDelegate.onFreshStartFailed(e); } }); } @Override public void onWipeFailed(Exception e) { Logger.warn(LOG_TAG, "Wipe failed."); freshStartDelegate.onFreshStartFailed(e); } }); } // Note that we do not yet implement wipeRemote: it's only necessary for // first sync options. // -- reset local stages, wipe server for each stage *except* clients // (stages only, not whole server!), send wipeEngine commands to each client. // // Similarly for startOver (because we don't receive that notification). // -- remove client data from server, reset local stages, clear keys, reset // backoff, clear all prefs, discard credentials. // // Change passphrase: wipe entire server, reset client to force upload, sync. // // When an engine is disabled: wipe its collections on the server, reupload // meta/global. // // On syncing each stage: if server has engine version 0 or old, wipe server, // reset client to prompt reupload. // If sync ID mismatch: take that syncID and reset client. protected void wipeServer(final CredentialsSource credentials, final WipeServerDelegate wipeDelegate) { SyncStorageRequest request; final GlobalSession self = this; try { request = new SyncStorageRequest(config.storageURL(false)); } catch (URISyntaxException ex) { Logger.warn(LOG_TAG, "Invalid URI in wipeServer."); wipeDelegate.onWipeFailed(ex); return; } request.delegate = new SyncStorageRequestDelegate() { @Override public String ifUnmodifiedSince() { return null; } @Override public void handleRequestSuccess(SyncStorageResponse response) { BaseResource.consumeEntity(response); wipeDelegate.onWiped(response.normalizedWeaveTimestamp()); } @Override public void handleRequestFailure(SyncStorageResponse response) { Logger.warn(LOG_TAG, "Got request failure " + response.getStatusCode() + " in wipeServer."); // Process HTTP failures here to pick up backoffs, etc. self.interpretHTTPFailure(response.httpResponse()); BaseResource.consumeEntity(response); // The exception thrown should not need the body of the response. wipeDelegate.onWipeFailed(new HTTPFailureException(response)); } @Override public void handleRequestError(Exception ex) { Logger.warn(LOG_TAG, "Got exception in wipeServer.", ex); wipeDelegate.onWipeFailed(ex); } @Override public String credentials() { return credentials.credentials(); } }; request.delete(); } public void wipeAllStages() { Logger.info(LOG_TAG, "Wiping all stages."); // Includes "clients". this.wipeStagesByEnum(Stage.getNamedStages()); } public static void wipeStages(Collection stages) { for (GlobalSyncStage stage : stages) { try { Logger.info(LOG_TAG, "Wiping " + stage); stage.wipeLocal(); } catch (Exception e) { Logger.error(LOG_TAG, "Ignoring wipe failure for stage " + stage, e); } } } public void wipeStagesByEnum(Collection stages) { GlobalSession.wipeStages(this.getSyncStagesByEnum(stages)); } public void wipeStagesByName(Collection names) { GlobalSession.wipeStages(this.getSyncStagesByName(names)); } public void resetAllStages() { Logger.info(LOG_TAG, "Resetting all stages."); // Includes "clients". this.resetStagesByEnum(Stage.getNamedStages()); } public static void resetStages(Collection stages) { for (GlobalSyncStage stage : stages) { try { Logger.info(LOG_TAG, "Resetting " + stage); stage.resetLocal(); } catch (Exception e) { Logger.error(LOG_TAG, "Ignoring reset failure for stage " + stage, e); } } } public void resetStagesByEnum(Collection stages) { GlobalSession.resetStages(this.getSyncStagesByEnum(stages)); } public void resetStagesByName(Collection names) { Collection stages = new ArrayList(); for (String name : names) { try { GlobalSyncStage stage = this.getSyncStageByName(name); stages.add(stage); } catch (NoSuchStageException e) { Logger.warn(LOG_TAG, "Cannot reset stage " + name + ": no such stage."); } } GlobalSession.resetStages(stages); } /** * Engines to include in a fresh meta/global record. *

* Returns either the persisted engine names (perhaps we have been node * re-assigned and are initializing a clean server: we want to upload the * persisted engine names so that we don't accidentally disable engines that * Android Sync doesn't recognize), or the set of engines names that Android * Sync implements. * * @return set of engine names. */ protected Set enabledEngineNames() { if (config.enabledEngineNames != null) { return config.enabledEngineNames; } return SyncConfiguration.validEngineNames(); } /** * Generate fresh crypto/keys collection. * @return crypto/keys collection. * @throws CryptoException */ @SuppressWarnings("static-method") public CollectionKeys generateNewCryptoKeys() throws CryptoException { return CollectionKeys.generateCollectionKeys(); } /** * Generate a fresh meta/global record. * @return meta/global record. */ public MetaGlobal generateNewMetaGlobal() { final String newSyncID = Utils.generateGuid(); final String metaURL = this.config.metaURL(); final String credentials = this.credentials(); ExtendedJSONObject engines = new ExtendedJSONObject(); for (String engineName : enabledEngineNames()) { EngineSettings engineSettings = null; try { GlobalSyncStage globalStage = this.getSyncStageByName(engineName); Integer version = globalStage.getStorageVersion(); if (version == null) { continue; // Don't want this stage to be included in meta/global. } engineSettings = new EngineSettings(Utils.generateGuid(), version.intValue()); } catch (NoSuchStageException e) { // No trouble; Android Sync might not recognize this engine yet. // By default, version 0. Other clients will see the 0 version and reset/wipe accordingly. engineSettings = new EngineSettings(Utils.generateGuid(), 0); } engines.put(engineName, engineSettings.toJSONObject()); } MetaGlobal metaGlobal = new MetaGlobal(metaURL, credentials); metaGlobal.setSyncID(newSyncID); metaGlobal.setStorageVersion(STORAGE_VERSION); metaGlobal.setEngines(engines); return metaGlobal; } /** * Suggest that your Sync client needs to be upgraded to work * with this server. */ public void requiresUpgrade() { Logger.info(LOG_TAG, "Client outdated storage version; requires update."); // TODO: notify UI. this.abort(null, "Requires upgrade"); } /** * If meta/global is missing or malformed, throws a MetaGlobalException. * Otherwise, returns true if there is an entry for this engine in the * meta/global "engines" object. * * @param engineName the name to check (e.g., "bookmarks"). * @param engineSettings * if non-null, verify that the server engine settings are congruent * with this, throwing the appropriate MetaGlobalException if not. * @return * true if the engine with the provided name is present in the * meta/global "engines" object, and verification passed. * * @throws MetaGlobalException */ public boolean engineIsEnabled(String engineName, EngineSettings engineSettings) throws MetaGlobalException { if (this.config.metaGlobal == null) { throw new MetaGlobalNotSetException(); } // This should not occur. if (this.config.enabledEngineNames == null) { Logger.error(LOG_TAG, "No enabled engines in config. Giving up."); throw new MetaGlobalMissingEnginesException(); } if (!(this.config.enabledEngineNames.contains(engineName))) { Logger.debug(LOG_TAG, "Engine " + engineName + " not enabled: no meta/global entry."); return false; } // If we have a meta/global, check that it's safe for us to sync. // (If we don't, we'll create one later, which is why we return `true` above.) if (engineSettings != null) { // Throws if there's a problem. this.config.metaGlobal.verifyEngineSettings(engineName, engineSettings); } return true; } public ClientsDataDelegate getClientsDelegate() { return this.clientsDelegate; } /** * The longest backoff observed to date; -1 means no backoff observed. */ protected final AtomicLong largestBackoffObserved = new AtomicLong(-1); /** * Reset any observed backoff and start observing HTTP responses for backoff * requests. */ protected void installAsHttpResponseObserver() { Logger.debug(LOG_TAG, "Installing " + this + " as BaseResource HttpResponseObserver."); BaseResource.setHttpResponseObserver(this); largestBackoffObserved.set(-1); } /** * Stop observing HttpResponses for backoff requests. */ protected void uninstallAsHttpResponseObserver() { Logger.debug(LOG_TAG, "Uninstalling " + this + " as BaseResource HttpResponseObserver."); BaseResource.setHttpResponseObserver(null); } /** * Observe all HTTP response for backoff requests on all status codes, not just errors. */ @Override public void observeHttpResponse(HttpResponse response) { long responseBackoff = (new SyncResponse(response)).totalBackoffInMilliseconds(); // TODO: don't allocate object? if (responseBackoff <= 0) { return; } Logger.debug(LOG_TAG, "Observed " + responseBackoff + " millisecond backoff request."); while (true) { long existingBackoff = largestBackoffObserved.get(); if (existingBackoff >= responseBackoff) { return; } if (largestBackoffObserved.compareAndSet(existingBackoff, responseBackoff)) { return; } } } }