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      1 /*
      2  * Copyright (C) 2017 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.settings.applications;
     17 
     18 import android.Manifest;
     19 import android.app.AppGlobals;
     20 import android.app.AppOpsManager;
     21 import android.content.Context;
     22 import android.content.pm.IPackageManager;
     23 import android.content.pm.PackageManager;
     24 import android.os.RemoteException;
     25 import android.util.Log;
     26 
     27 import com.android.internal.util.ArrayUtils;
     28 import com.android.settings.R;
     29 import com.android.settingslib.applications.ApplicationsState;
     30 import com.android.settingslib.applications.ApplicationsState.AppEntry;
     31 import com.android.settingslib.applications.ApplicationsState.AppFilter;
     32 
     33 import java.util.List;
     34 
     35 /**
     36  * Connects app op info to the ApplicationsState. Wraps around the generic AppStateBaseBridge
     37  * class to tailor to the semantics of {@link AppOpsManager#OP_REQUEST_INSTALL_PACKAGES}
     38  * Also provides app filters that can use the info.
     39  */
     40 public class AppStateInstallAppsBridge extends AppStateBaseBridge {
     41 
     42     private static final String TAG = AppStateInstallAppsBridge.class.getSimpleName();
     43 
     44     private final IPackageManager mIpm;
     45     private final AppOpsManager mAppOpsManager;
     46 
     47     public AppStateInstallAppsBridge(Context context, ApplicationsState appState,
     48             Callback callback) {
     49         super(appState, callback);
     50         mIpm = AppGlobals.getPackageManager();
     51         mAppOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
     52     }
     53 
     54     @Override
     55     protected void updateExtraInfo(AppEntry app, String packageName, int uid) {
     56         app.extraInfo = createInstallAppsStateFor(packageName, uid);
     57     }
     58 
     59     @Override
     60     protected void loadAllExtraInfo() {
     61         // TODO: consider making this a batch operation with a single binder call
     62         final List<AppEntry> allApps = mAppSession.getAllApps();
     63         for (int i = 0; i < allApps.size(); i++) {
     64             AppEntry currentEntry = allApps.get(i);
     65             updateExtraInfo(currentEntry, currentEntry.info.packageName, currentEntry.info.uid);
     66         }
     67     }
     68 
     69     private boolean hasRequestedAppOpPermission(String permission, String packageName) {
     70         try {
     71             String[] packages = mIpm.getAppOpPermissionPackages(permission);
     72             return ArrayUtils.contains(packages, packageName);
     73         } catch (RemoteException exc) {
     74             Log.e(TAG, "PackageManager dead. Cannot get permission info");
     75             return false;
     76         }
     77     }
     78 
     79     private boolean hasPermission(String permission, int uid) {
     80         try {
     81             int result = mIpm.checkUidPermission(permission, uid);
     82             return result == PackageManager.PERMISSION_GRANTED;
     83         } catch (RemoteException e) {
     84             Log.e(TAG, "PackageManager dead. Cannot get permission info");
     85             return false;
     86         }
     87     }
     88 
     89     private int getAppOpMode(int appOpCode, int uid, String packageName) {
     90         return mAppOpsManager.checkOpNoThrow(appOpCode, uid, packageName);
     91     }
     92 
     93     public InstallAppsState createInstallAppsStateFor(String packageName, int uid) {
     94         final InstallAppsState appState = new InstallAppsState();
     95         appState.permissionRequested = hasRequestedAppOpPermission(
     96                 Manifest.permission.REQUEST_INSTALL_PACKAGES, packageName);
     97         appState.permissionGranted = hasPermission(Manifest.permission.REQUEST_INSTALL_PACKAGES,
     98                 uid);
     99         appState.appOpMode = getAppOpMode(AppOpsManager.OP_REQUEST_INSTALL_PACKAGES, uid,
    100                 packageName);
    101         return appState;
    102     }
    103 
    104     /**
    105      * Collection of information to be used as {@link AppEntry#extraInfo} objects
    106      */
    107     public static class InstallAppsState {
    108         boolean permissionRequested;
    109         boolean permissionGranted;
    110         int appOpMode;
    111 
    112         public InstallAppsState() {
    113             this.appOpMode = AppOpsManager.MODE_DEFAULT;
    114         }
    115 
    116         public boolean canInstallApps() {
    117             if (appOpMode == AppOpsManager.MODE_DEFAULT) {
    118                 return permissionGranted;
    119             } else {
    120                 return appOpMode == AppOpsManager.MODE_ALLOWED;
    121             }
    122         }
    123 
    124         public boolean isPotentialAppSource() {
    125             return appOpMode != AppOpsManager.MODE_DEFAULT || permissionRequested;
    126         }
    127 
    128         @Override
    129         public String toString() {
    130             StringBuilder sb = new StringBuilder("[permissionGranted: " + permissionGranted);
    131             sb.append(", permissionRequested: " + permissionRequested);
    132             sb.append(", appOpMode: " + appOpMode);
    133             sb.append("]");
    134             return sb.toString();
    135         }
    136     }
    137 
    138     public static final AppFilter FILTER_APP_SOURCES = new AppFilter() {
    139 
    140         @Override
    141         public void init() {
    142         }
    143 
    144         @Override
    145         public boolean filterApp(AppEntry info) {
    146             if (info.extraInfo == null || !(info.extraInfo instanceof InstallAppsState)) {
    147                 return false;
    148             }
    149             InstallAppsState state = (InstallAppsState) info.extraInfo;
    150             return state.isPotentialAppSource();
    151         }
    152     };
    153 }
    154