Clearing up invalid entries when SyncStorageEngine starts

am: 271702fc28

Change-Id: I4943cf417be41679c2fa332223825dd01a477814

services/core/java/com/android/server/content/SyncStorageEngine.java

@@ -18,6 +18,7 @@ package com.android.server.content;
 
 import android.accounts.Account;
 import android.accounts.AccountAndUser;
+import android.accounts.AccountManager;
 import android.content.ComponentName;
 import android.content.ContentResolver;
 import android.content.Context;
@@ -26,6 +27,7 @@ import android.content.PeriodicSync;
 import android.content.SyncInfo;
 import android.content.SyncRequest;
 import android.content.SyncStatusInfo;
+import android.content.pm.PackageManager;
 import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteException;
@@ -404,6 +406,49 @@ public class SyncStorageEngine extends Handler {
         public void onSyncRequest(EndPoint info, int reason, Bundle extras);
     }
 
+    /**
+     * Validator that maintains a lazy cache of accounts and providers to tell if an authority or
+     * account is valid.
+     */
+    private static class AccountAuthorityValidator {
+        final private AccountManager mAccountManager;
+        final private PackageManager mPackageManager;
+        final private SparseArray<Account[]> mAccountsCache;
+        final private SparseArray<ArrayMap<String, Boolean>> mProvidersPerUserCache;
+
+        AccountAuthorityValidator(Context context) {
+            mAccountManager = (AccountManager) context.getSystemService(Context.ACCOUNT_SERVICE);
+            mPackageManager = context.getPackageManager();
+            mAccountsCache = new SparseArray<>();
+            mProvidersPerUserCache = new SparseArray<>();
+        }
+
+        // An account is valid if an installed authenticator has previously created that account
+        // on the device
+        boolean isAccountValid(Account account, int userId) {
+            Account[] accountsForUser = mAccountsCache.get(userId);
+            if (accountsForUser == null) {
+                accountsForUser = mAccountManager.getAccountsAsUser(userId);
+                mAccountsCache.put(userId, accountsForUser);
+            }
+            return ArrayUtils.contains(accountsForUser, account);
+        }
+
+        // An authority is only valid if it has a content provider installed on the system
+        boolean isAuthorityValid(String authority, int userId) {
+            ArrayMap<String, Boolean> authorityMap = mProvidersPerUserCache.get(userId);
+            if (authorityMap == null) {
+                authorityMap = new ArrayMap<>();
+                mProvidersPerUserCache.put(userId, authorityMap);
+            }
+            if (!authorityMap.containsKey(authority)) {
+                authorityMap.put(authority,
+                        mPackageManager.resolveContentProviderAsUser(authority, 0, userId) != null);
+            }
+            return authorityMap.get(authority);
+        }
+    }
+
     // Primary list of all syncable authorities.  Also our global lock.
     private final SparseArray<AuthorityInfo> mAuthorities =
             new SparseArray<AuthorityInfo>();
@@ -1862,12 +1907,13 @@ public class SyncStorageEngine extends Handler {
                 eventType = parser.next();
                 AuthorityInfo authority = null;
                 PeriodicSync periodicSync = null;
+                AccountAuthorityValidator validator = new AccountAuthorityValidator(mContext);
                 do {
                     if (eventType == XmlPullParser.START_TAG) {
                         tagName = parser.getName();
                         if (parser.getDepth() == 2) {
                             if ("authority".equals(tagName)) {
-                                authority = parseAuthority(parser, version);
+                                authority = parseAuthority(parser, version, validator);
                                 periodicSync = null;
                                 if (authority != null) {
                                     if (authority.ident > highestAuthorityId) {
@@ -2000,7 +2046,8 @@ public class SyncStorageEngine extends Handler {
         mMasterSyncAutomatically.put(userId, listen);
     }
 
-    private AuthorityInfo parseAuthority(XmlPullParser parser, int version) {
+    private AuthorityInfo parseAuthority(XmlPullParser parser, int version,
+            AccountAuthorityValidator validator) {
         AuthorityInfo authority = null;
         int id = -1;
         try {
@@ -2045,12 +2092,22 @@ public class SyncStorageEngine extends Handler {
                     info = new EndPoint(
                             new Account(accountName, accountType),
                             authorityName, userId);
+                    if (validator.isAccountValid(info.account, userId)
+                            && validator.isAuthorityValid(authorityName, userId)) {
+                        authority = getOrCreateAuthorityLocked(info, id, false);
+                    } else {
+                        EventLog.writeEvent(0x534e4554, "35028827", -1,
+                                "account:" + info.account + " provider:" + authorityName + " user:"
+                                        + userId);
+                    }
                 } else {
                     info = new EndPoint(
                             new ComponentName(packageName, className),
                             userId);
+                    authority = getOrCreateAuthorityLocked(info, id, false);
                 }
-                authority = getOrCreateAuthorityLocked(info, id, false);
+            }
+            if (authority != null) {
                 // If the version is 0 then we are upgrading from a file format that did not
                 // know about periodic syncs. In that case don't clear the list since we
                 // want the default, which is a daily periodic sync.
@@ -2059,8 +2116,6 @@ public class SyncStorageEngine extends Handler {
                 if (version > 0) {
                     authority.periodicSyncs.clear();
                 }
-            }
-            if (authority != null) {
                 authority.enabled = enabled == null || Boolean.parseBoolean(enabled);
                 if ("unknown".equals(syncable)) {
                     authority.syncable = -1;