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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.app.admin.DevicePolicyManager;
     24 import android.content.ComponentName;
     25 import android.content.Context;
     26 import android.content.pm.IPackageManager;
     27 
     28 import com.android.internal.annotations.VisibleForTesting;
     29 import com.android.managedprovisioning.common.IllegalProvisioningArgumentException;
     30 import com.android.managedprovisioning.common.ProvisionLogger;
     31 import com.android.managedprovisioning.common.Utils;
     32 import com.android.managedprovisioning.model.ProvisioningParams;
     33 
     34 import java.lang.annotation.Retention;
     35 import java.lang.annotation.RetentionPolicy;
     36 import java.util.Collections;
     37 import java.util.Set;
     38 
     39 /**
     40  * Logic that calculates which system apps should be removed during profile creation and subsequent
     41  * OTAs. It also decides whether a snapshot should be taken or not.
     42  */
     43 public class NonRequiredAppsLogic {
     44 
     45     @IntDef({
     46             Case.OTA_LEAVE_APPS,
     47             Case.OTA_REMOVE_APPS,
     48             Case.NEW_PROFILE_LEAVE_APPS,
     49             Case.NEW_PROFILE_REMOVE_APPS
     50     })
     51     @Retention(RetentionPolicy.SOURCE)
     52     private @interface Case {
     53         int OTA_LEAVE_APPS = 0;
     54         int OTA_REMOVE_APPS = 1;
     55         int NEW_PROFILE_LEAVE_APPS = 2;
     56         int NEW_PROFILE_REMOVE_APPS = 3;
     57     }
     58 
     59     private final Context mContext;
     60     private final IPackageManager mIPackageManager;
     61     private final DevicePolicyManager mDevicePolicyManager;
     62     private final boolean mNewProfile;
     63     private final ProvisioningParams mParams;
     64     private final SystemAppsSnapshot mSnapshot;
     65     private final Utils mUtils;
     66 
     67     public NonRequiredAppsLogic(
     68             Context context,
     69             boolean newProfile,
     70             ProvisioningParams params) {
     71         this(
     72                 context,
     73                 AppGlobals.getPackageManager(),
     74                 (DevicePolicyManager) context.getSystemService(Context.DEVICE_POLICY_SERVICE),
     75                 newProfile,
     76                 params,
     77                 new SystemAppsSnapshot(context),
     78                 new Utils());
     79     }
     80 
     81     @VisibleForTesting
     82     NonRequiredAppsLogic(
     83             Context context,
     84             IPackageManager iPackageManager,
     85             DevicePolicyManager devicePolicyManager,
     86             boolean newProfile,
     87             ProvisioningParams params,
     88             SystemAppsSnapshot snapshot,
     89             Utils utils) {
     90         mContext = context;
     91         mIPackageManager = checkNotNull(iPackageManager);
     92         mDevicePolicyManager = checkNotNull(devicePolicyManager);
     93         mNewProfile = newProfile;
     94         mParams = checkNotNull(params);
     95         mSnapshot = checkNotNull(snapshot);
     96         mUtils = checkNotNull(utils);
     97     }
     98 
     99     public Set<String> getSystemAppsToRemove(int userId) {
    100         if (!shouldDeleteSystemApps(userId)) {
    101             return Collections.emptySet();
    102         }
    103 
    104         // Start with all system apps
    105         Set<String> newSystemApps = mUtils.getCurrentSystemApps(mIPackageManager, userId);
    106 
    107         // Remove the ones that were already present in the last snapshot only when OTA
    108         if (!mNewProfile) {
    109             newSystemApps.removeAll(mSnapshot.getSnapshot(userId));
    110         }
    111         ComponentName deviceAdminComponentName;
    112         try {
    113             deviceAdminComponentName = mParams.inferDeviceAdminComponentName(
    114                     mUtils, mContext, userId);
    115         } catch (IllegalProvisioningArgumentException ex) {
    116             // Should not happen
    117             throw new RuntimeException("Failed to infer device admin component name", ex);
    118         }
    119         // Get the packages from the black/white lists
    120         Set<String> packagesToDelete = mDevicePolicyManager.getDisallowedSystemApps(
    121                 deviceAdminComponentName, userId, mParams.provisioningAction);
    122 
    123         // Retain only new system apps
    124         packagesToDelete.retainAll(newSystemApps);
    125 
    126         return packagesToDelete;
    127     }
    128 
    129     public void maybeTakeSystemAppsSnapshot(int userId) {
    130         if (shouldDeleteSystemApps(userId)) {
    131             mSnapshot.takeNewSnapshot(userId);
    132         }
    133     }
    134 
    135     private boolean shouldDeleteSystemApps(int userId) {
    136         @Case int which = getCase(userId);
    137         return (Case.NEW_PROFILE_REMOVE_APPS == which) || (Case.OTA_REMOVE_APPS == which);
    138     }
    139 
    140     @Case
    141     private int getCase(int userId) {
    142         if (mNewProfile) {
    143             if (mParams.leaveAllSystemAppsEnabled) {
    144                 return Case.NEW_PROFILE_LEAVE_APPS;
    145             } else {
    146                 return Case.NEW_PROFILE_REMOVE_APPS;
    147             }
    148         } else {
    149             if (mSnapshot.hasSnapshot(userId)) {
    150                 return Case.OTA_REMOVE_APPS;
    151             } else {
    152                 return Case.OTA_LEAVE_APPS;
    153             }
    154         }
    155     }
    156 }
    157