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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 
     17 package com.android.launcher3.util;
     18 
     19 import android.app.AppOpsManager;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.pm.ApplicationInfo;
     23 import android.content.pm.PackageManager;
     24 import android.content.pm.PackageManager.NameNotFoundException;
     25 import android.content.pm.ResolveInfo;
     26 import android.os.Build;
     27 import android.text.TextUtils;
     28 
     29 import com.android.launcher3.Utilities;
     30 
     31 import java.util.ArrayList;
     32 
     33 /**
     34  * Utility methods using package manager
     35  */
     36 public class PackageManagerHelper {
     37 
     38     private static final int FLAG_SUSPENDED = 1<<30;
     39     private static final String LIVE_WALLPAPER_PICKER_PKG = "com.android.wallpaper.livepicker";
     40 
     41     /**
     42      * Returns true if the app can possibly be on the SDCard. This is just a workaround and doesn't
     43      * guarantee that the app is on SD card.
     44      */
     45     public static boolean isAppOnSdcard(PackageManager pm, String packageName) {
     46         return isAppEnabled(pm, packageName, PackageManager.GET_UNINSTALLED_PACKAGES);
     47     }
     48 
     49     public static boolean isAppEnabled(PackageManager pm, String packageName) {
     50         return isAppEnabled(pm, packageName, 0);
     51     }
     52 
     53     public static boolean isAppEnabled(PackageManager pm, String packageName, int flags) {
     54         try {
     55             ApplicationInfo info = pm.getApplicationInfo(packageName, flags);
     56             return info != null && info.enabled;
     57         } catch (PackageManager.NameNotFoundException e) {
     58             return false;
     59         }
     60     }
     61 
     62     public static boolean isAppSuspended(PackageManager pm, String packageName) {
     63         try {
     64             ApplicationInfo info = pm.getApplicationInfo(packageName, 0);
     65             return info != null && isAppSuspended(info);
     66         } catch (PackageManager.NameNotFoundException e) {
     67             return false;
     68         }
     69     }
     70 
     71     public static boolean isAppSuspended(ApplicationInfo info) {
     72         // The value of FLAG_SUSPENDED was reused by a hidden constant
     73         // ApplicationInfo.FLAG_PRIVILEGED prior to N, so only check for suspended flag on N
     74         // or later.
     75         if (Utilities.isNycOrAbove()) {
     76             return (info.flags & FLAG_SUSPENDED) != 0;
     77         } else {
     78             return false;
     79         }
     80     }
     81 
     82     /**
     83      * Returns the package for a wallpaper picker system app giving preference to a app which
     84      * is not as image picker.
     85      */
     86     public static String getWallpaperPickerPackage(PackageManager pm) {
     87         ArrayList<String> excludePackages = new ArrayList<>();
     88         // Exclude packages which contain an image picker
     89         for (ResolveInfo info : pm.queryIntentActivities(
     90                 new Intent(Intent.ACTION_GET_CONTENT).setType("image/*"), 0)) {
     91             excludePackages.add(info.activityInfo.packageName);
     92         }
     93         excludePackages.add(LIVE_WALLPAPER_PICKER_PKG);
     94 
     95         for (ResolveInfo info : pm.queryIntentActivities(
     96                 new Intent(Intent.ACTION_SET_WALLPAPER), 0)) {
     97             if (!excludePackages.contains(info.activityInfo.packageName) &&
     98                     (info.activityInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
     99                 return info.activityInfo.packageName;
    100             }
    101         }
    102         return excludePackages.get(0);
    103     }
    104 
    105     /**
    106      * Returns true if {@param srcPackage} has the permission required to start the activity from
    107      * {@param intent}. If {@param srcPackage} is null, then the activity should not need
    108      * any permissions
    109      */
    110     public static boolean hasPermissionForActivity(Context context, Intent intent,
    111             String srcPackage) {
    112         PackageManager pm = context.getPackageManager();
    113         ResolveInfo target = pm.resolveActivity(intent, 0);
    114         if (target == null) {
    115             // Not a valid target
    116             return false;
    117         }
    118         if (TextUtils.isEmpty(target.activityInfo.permission)) {
    119             // No permission is needed
    120             return true;
    121         }
    122         if (TextUtils.isEmpty(srcPackage)) {
    123             // The activity requires some permission but there is no source.
    124             return false;
    125         }
    126 
    127         // Source does not have sufficient permissions.
    128         if(pm.checkPermission(target.activityInfo.permission, srcPackage) !=
    129                 PackageManager.PERMISSION_GRANTED) {
    130             return false;
    131         }
    132 
    133         if (!Utilities.ATLEAST_MARSHMALLOW) {
    134             // These checks are sufficient for below M devices.
    135             return true;
    136         }
    137 
    138         // On M and above also check AppOpsManager for compatibility mode permissions.
    139         if (TextUtils.isEmpty(AppOpsManager.permissionToOp(target.activityInfo.permission))) {
    140             // There is no app-op for this permission, which could have been disabled.
    141             return true;
    142         }
    143 
    144         // There is no direct way to check if the app-op is allowed for a particular app. Since
    145         // app-op is only enabled for apps running in compatibility mode, simply block such apps.
    146 
    147         try {
    148             return pm.getApplicationInfo(srcPackage, 0).targetSdkVersion >= Build.VERSION_CODES.M;
    149         } catch (NameNotFoundException e) { }
    150 
    151         return false;
    152     }
    153 }
    154