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      1 /*
      2  * Copyright 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 
     17 package com.android.managedprovisioning.task.nonrequiredapps;
     18 
     19 import static com.android.internal.util.Preconditions.checkNotNull;
     20 
     21 import android.annotation.IntDef;
     22 import android.app.AppGlobals;
     23 import android.content.Context;
     24 import android.content.pm.IPackageManager;
     25 import android.content.pm.PackageManager;
     26 
     27 import com.android.internal.annotations.VisibleForTesting;
     28 import com.android.managedprovisioning.common.Utils;
     29 import com.android.managedprovisioning.model.ProvisioningParams;
     30 
     31 import java.lang.annotation.Retention;
     32 import java.lang.annotation.RetentionPolicy;
     33 import java.util.Collections;
     34 import java.util.Set;
     35 
     36 /**
     37  * Logic that calculates which system apps should be removed during profile creation and subsequent
     38  * OTAs. It also decides whether a snapshot should be taken or not.
     39  */
     40 public class NonRequiredAppsLogic {
     41 
     42     @IntDef({
     43             Case.OTA_LEAVE_APPS,
     44             Case.OTA_REMOVE_APPS,
     45             Case.NEW_PROFILE_LEAVE_APPS,
     46             Case.NEW_PROFILE_REMOVE_APPS
     47     })
     48     @Retention(RetentionPolicy.SOURCE)
     49     private @interface Case {
     50         int OTA_LEAVE_APPS = 0;
     51         int OTA_REMOVE_APPS = 1;
     52         int NEW_PROFILE_LEAVE_APPS = 2;
     53         int NEW_PROFILE_REMOVE_APPS = 3;
     54     }
     55 
     56     private final PackageManager mPackageManager;
     57     private final IPackageManager mIPackageManager;
     58     private final boolean mNewProfile;
     59     private final ProvisioningParams mParams;
     60     private final SystemAppsSnapshot mSnapshot;
     61     private final OverlayPackagesProvider mProvider;
     62     private final Utils mUtils;
     63 
     64     public NonRequiredAppsLogic(
     65             Context context,
     66             boolean newProfile,
     67             ProvisioningParams params) {
     68         this(
     69                 context.getPackageManager(),
     70                 AppGlobals.getPackageManager(),
     71                 newProfile,
     72                 params,
     73                 new SystemAppsSnapshot(context),
     74                 new OverlayPackagesProvider(context, params),
     75                 new Utils());
     76     }
     77 
     78     @VisibleForTesting
     79     NonRequiredAppsLogic(
     80             PackageManager packageManager,
     81             IPackageManager iPackageManager,
     82             boolean newProfile,
     83             ProvisioningParams params,
     84             SystemAppsSnapshot snapshot,
     85             OverlayPackagesProvider provider,
     86             Utils utils) {
     87         mPackageManager = checkNotNull(packageManager);
     88         mIPackageManager = checkNotNull(iPackageManager);
     89         mNewProfile = newProfile;
     90         mParams = checkNotNull(params);
     91         mSnapshot = checkNotNull(snapshot);
     92         mProvider = checkNotNull(provider);
     93         mUtils = checkNotNull(utils);
     94     }
     95 
     96     public Set<String> getSystemAppsToRemove(int userId) {
     97         if (!shouldDeleteSystemApps(userId)) {
     98             return Collections.emptySet();
     99         }
    100 
    101         // Start with all system apps
    102         Set<String> newSystemApps = mUtils.getCurrentSystemApps(mIPackageManager, userId);
    103 
    104         // Remove the ones that were already present in the last snapshot only when OTA
    105         if (!mNewProfile) {
    106             newSystemApps.removeAll(mSnapshot.getSnapshot(userId));
    107         }
    108 
    109         // Get the packages from the black/white lists
    110         Set<String> packagesToDelete = mProvider.getNonRequiredApps(userId);
    111 
    112         // Retain only new system apps
    113         packagesToDelete.retainAll(newSystemApps);
    114 
    115         return packagesToDelete;
    116     }
    117 
    118     public void maybeTakeSystemAppsSnapshot(int userId) {
    119         if (shouldDeleteSystemApps(userId)) {
    120             mSnapshot.takeNewSnapshot(userId);
    121         }
    122     }
    123 
    124     private boolean shouldDeleteSystemApps(int userId) {
    125         @Case int which = getCase(userId);
    126         return (Case.NEW_PROFILE_REMOVE_APPS == which) || (Case.OTA_REMOVE_APPS == which);
    127     }
    128 
    129     private @Case int getCase(int userId) {
    130         if (mNewProfile) {
    131             if (mParams.leaveAllSystemAppsEnabled) {
    132                 return Case.NEW_PROFILE_LEAVE_APPS;
    133             } else {
    134                 return Case.NEW_PROFILE_REMOVE_APPS;
    135             }
    136         } else {
    137             if (mSnapshot.hasSnapshot(userId)) {
    138                 return Case.OTA_REMOVE_APPS;
    139             } else {
    140                 return Case.OTA_LEAVE_APPS;
    141             }
    142         }
    143     }
    144 }
    145