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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.server.wifi.util;
     18 
     19 import android.app.ActivityManager;
     20 import android.app.AppGlobals;
     21 import android.app.admin.DevicePolicyManagerInternal;
     22 import android.content.Context;
     23 import android.os.RemoteException;
     24 import android.os.UserHandle;
     25 
     26 import com.android.server.LocalServices;
     27 
     28 import java.util.List;
     29 
     30 /**
     31  * A wifi permissions dependency class to wrap around external
     32  * calls to static methods that enable testing.
     33  */
     34 public class WifiPermissionsWrapper {
     35     private static final String TAG = "WifiPermissionsWrapper";
     36     private final Context mContext;
     37 
     38     public WifiPermissionsWrapper(Context context) {
     39         mContext = context;
     40     }
     41 
     42     public int getCurrentUser() {
     43         return ActivityManager.getCurrentUser();
     44     }
     45 
     46     /**
     47      * Returns the user ID corresponding to the UID
     48      * @param uid Calling Uid
     49      * @return userid Corresponding user id
     50      */
     51     public int getCallingUserId(int uid) {
     52         return UserHandle.getUserId(uid);
     53     }
     54 
     55     /**
     56      * Get the PackageName of the top running task
     57      * @return String corresponding to the package
     58      */
     59     public String getTopPkgName() {
     60         ActivityManager am = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
     61         String topTaskPkg = " ";
     62         List<ActivityManager.RunningTaskInfo> tasks = am.getRunningTasks(1);
     63         if (!tasks.isEmpty()) {
     64             return tasks.get(0).topActivity.getPackageName();
     65         }
     66         return topTaskPkg;
     67     }
     68 
     69     /**
     70      * API is wrap around ActivityManager class to
     71      * get location permissions for a certain UID
     72      * @param: Manifest permission string
     73      * @param: Uid to get permission for
     74      * @return: Permissions setting
     75      */
     76     public int getUidPermission(String permissionType, int uid) {
     77         return ActivityManager.checkUidPermission(permissionType, uid);
     78     }
     79 
     80     /**
     81      * Gets the local service {link@ DevicePolicyManagerInternal}, can be null
     82      */
     83     public DevicePolicyManagerInternal getDevicePolicyManagerInternal() {
     84         return LocalServices.getService(DevicePolicyManagerInternal.class);
     85     }
     86 
     87     /**
     88      * Determines if the caller has the override wifi config permission.
     89      *
     90      * @param uid to check the permission for
     91      * @return int representation of success or denied
     92      * @throws RemoteException
     93      */
     94     public int getOverrideWifiConfigPermission(int uid) throws RemoteException {
     95         return AppGlobals.getPackageManager().checkUidPermission(
     96                 android.Manifest.permission.OVERRIDE_WIFI_CONFIG, uid);
     97     }
     98 }
     99