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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.contacts.model;
     17 
     18 import android.accounts.Account;
     19 import android.accounts.AccountManager;
     20 import android.content.Context;
     21 
     22 import com.android.contacts.Experiments;
     23 import com.android.contacts.model.account.AccountWithDataSet;
     24 import com.android.contacts.model.account.GoogleAccountType;
     25 import com.android.contactsbind.ObjectFactory;
     26 import com.android.contactsbind.experiments.Flags;
     27 
     28 import java.util.Collections;
     29 import java.util.HashSet;
     30 import java.util.List;
     31 import java.util.Set;
     32 
     33 /**
     34  * Attempts to detect accounts for device contacts
     35  */
     36 public abstract class DeviceLocalAccountLocator {
     37 
     38     /**
     39      * Returns a list of device local accounts
     40      */
     41     public abstract List<AccountWithDataSet> getDeviceLocalAccounts();
     42 
     43     // This works on Nexus and AOSP because the local device account is the null account but most
     44     // OEMs have a special account name and type for their device account.
     45     public static final DeviceLocalAccountLocator NULL_ONLY = new DeviceLocalAccountLocator() {
     46         @Override
     47         public List<AccountWithDataSet> getDeviceLocalAccounts() {
     48             return Collections.singletonList(AccountWithDataSet.getNullAccount());
     49         }
     50     };
     51 
     52     public static DeviceLocalAccountLocator create(Context context,
     53             Set<String> knownAccountTypes) {
     54         if (Flags.getInstance().getBoolean(Experiments.CP2_DEVICE_ACCOUNT_DETECTION_ENABLED)) {
     55             return new Cp2DeviceLocalAccountLocator(context.getContentResolver(),
     56                     ObjectFactory.getDeviceLocalAccountTypeFactory(context), knownAccountTypes);
     57         }
     58         return NULL_ONLY;
     59     }
     60 
     61     public static DeviceLocalAccountLocator create(Context context) {
     62         final AccountManager accountManager =
     63                 (AccountManager) context.getSystemService(Context.ACCOUNT_SERVICE);
     64         final Set<String> knownTypes = new HashSet<>();
     65         for (Account account : accountManager.getAccounts()) {
     66             knownTypes.add(account.type);
     67         }
     68         if (Flags.getInstance().getBoolean(Experiments.CP2_DEVICE_ACCOUNT_DETECTION_ENABLED)) {
     69             return new Cp2DeviceLocalAccountLocator(context.getContentResolver(),
     70                     ObjectFactory.getDeviceLocalAccountTypeFactory(context), knownTypes);
     71         } else {
     72             return new NexusDeviceAccountLocator(accountManager);
     73         }
     74     }
     75 
     76     /**
     77      * On Nexus the "device" account uses "null" values for the account name and type columns
     78      *
     79      * <p>However, the focus sync adapter automatically migrates contacts from this null
     80      * account to a Google account if one exists. Hence, the device account should be returned
     81      * only when there is no Google Account added
     82      * </p>
     83      */
     84     public static class NexusDeviceAccountLocator extends DeviceLocalAccountLocator {
     85 
     86         private final AccountManager mAccountManager;
     87 
     88         public NexusDeviceAccountLocator(AccountManager accountManager) {
     89             mAccountManager = accountManager;
     90         }
     91 
     92         @Override
     93         public List<AccountWithDataSet> getDeviceLocalAccounts() {
     94             @SuppressWarnings("MissingPermission")
     95             final Account[] accounts = mAccountManager
     96                     .getAccountsByType(GoogleAccountType.ACCOUNT_TYPE);
     97 
     98             if (accounts.length > 0) {
     99                 return Collections.emptyList();
    100             } else {
    101                 return Collections.singletonList(AccountWithDataSet.getNullAccount());
    102             }
    103         }
    104     }
    105 }
    106