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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 
     17 package com.android.server.timezone;
     18 
     19 import android.content.Context;
     20 import android.content.pm.PackageManager;
     21 import android.os.AsyncTask;
     22 import android.os.Binder;
     23 import android.os.ParcelFileDescriptor;
     24 
     25 import java.io.FileInputStream;
     26 import java.io.IOException;
     27 import java.io.PrintWriter;
     28 import java.util.concurrent.Executor;
     29 import libcore.io.Streams;
     30 
     31 /**
     32  * A single class that implements multiple helper interfaces for use by {@link RulesManagerService}.
     33  */
     34 final class RulesManagerServiceHelperImpl implements PermissionHelper, Executor {
     35 
     36     private final Context mContext;
     37 
     38     RulesManagerServiceHelperImpl(Context context) {
     39         mContext = context;
     40     }
     41 
     42     @Override
     43     public void enforceCallerHasPermission(String requiredPermission) {
     44         mContext.enforceCallingPermission(requiredPermission, null /* message */);
     45     }
     46 
     47     @Override
     48     public boolean checkDumpPermission(String tag, PrintWriter pw) {
     49         // TODO(nfuller): Switch to DumpUtils.checkDumpPermission() when it is available in AOSP.
     50         if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
     51                 != PackageManager.PERMISSION_GRANTED) {
     52             pw.println("Permission Denial: can't dump LocationManagerService from from pid="
     53                     + Binder.getCallingPid()
     54                     + ", uid=" + Binder.getCallingUid());
     55             return false;
     56         }
     57         return true;
     58     }
     59 
     60     @Override
     61     public void execute(Runnable runnable) {
     62         AsyncTask.execute(runnable);
     63     }
     64 }
     65