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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.incallui.legacyblocking;
     18 
     19 import android.Manifest.permission;
     20 import android.annotation.TargetApi;
     21 import android.content.Context;
     22 import android.content.pm.PackageManager;
     23 import android.database.Cursor;
     24 import android.os.AsyncTask;
     25 import android.os.Build.VERSION_CODES;
     26 import android.provider.CallLog;
     27 import android.support.v4.content.ContextCompat;
     28 import com.android.dialer.common.LogUtil;
     29 import com.android.dialer.telecom.TelecomUtil;
     30 import java.util.Objects;
     31 
     32 /**
     33  * Deletes a blocked call from the call log. This is only used on Android Marshmallow. On later
     34  * versions of the OS, call blocking is implemented in the system and there's no need to mess with
     35  * the call log.
     36  */
     37 @TargetApi(VERSION_CODES.M)
     38 public class DeleteBlockedCallTask extends AsyncTask<Void, Void, Long> {
     39 
     40   public static final String IDENTIFIER = "DeleteBlockedCallTask";
     41 
     42   // Try to identify if a call log entry corresponds to a number which was blocked. We match by
     43   // by comparing its creation time to the time it was added in the InCallUi and seeing if they
     44   // fall within a certain threshold.
     45   private static final int MATCH_BLOCKED_CALL_THRESHOLD_MS = 3000;
     46 
     47   private final Context context;
     48   private final Listener listener;
     49   private final String number;
     50   private final long timeAddedMillis;
     51 
     52   /**
     53    * Creates the task to delete the new {@link CallLog} entry from the given blocked number.
     54    *
     55    * @param number The blocked number.
     56    * @param timeAddedMillis The time at which the call from the blocked number was placed.
     57    */
     58   public DeleteBlockedCallTask(
     59       Context context, Listener listener, String number, long timeAddedMillis) {
     60     this.context = Objects.requireNonNull(context);
     61     this.listener = Objects.requireNonNull(listener);
     62     this.number = number;
     63     this.timeAddedMillis = timeAddedMillis;
     64   }
     65 
     66   @Override
     67   public Long doInBackground(Void... params) {
     68     if (ContextCompat.checkSelfPermission(context, permission.READ_CALL_LOG)
     69             != PackageManager.PERMISSION_GRANTED
     70         || ContextCompat.checkSelfPermission(context, permission.WRITE_CALL_LOG)
     71             != PackageManager.PERMISSION_GRANTED) {
     72       LogUtil.i("DeleteBlockedCallTask.doInBackground", "missing call log permissions");
     73       return -1L;
     74     }
     75 
     76     // First, lookup the call log entry of the most recent call with this number.
     77     try (Cursor cursor =
     78         context
     79             .getContentResolver()
     80             .query(
     81                 TelecomUtil.getCallLogUri(context),
     82                 CallLogDeleteBlockedCallQuery.PROJECTION,
     83                 CallLog.Calls.NUMBER + "= ?",
     84                 new String[] {number},
     85                 CallLog.Calls.DATE + " DESC LIMIT 1")) {
     86 
     87       // If match is found, delete this call log entry and return the call log entry id.
     88       if (cursor != null && cursor.moveToFirst()) {
     89         long creationTime = cursor.getLong(CallLogDeleteBlockedCallQuery.DATE_COLUMN_INDEX);
     90         if (timeAddedMillis > creationTime
     91             && timeAddedMillis - creationTime < MATCH_BLOCKED_CALL_THRESHOLD_MS) {
     92           long callLogEntryId = cursor.getLong(CallLogDeleteBlockedCallQuery.ID_COLUMN_INDEX);
     93           context
     94               .getContentResolver()
     95               .delete(
     96                   TelecomUtil.getCallLogUri(context),
     97                   CallLog.Calls._ID + " IN (" + callLogEntryId + ")",
     98                   null);
     99           return callLogEntryId;
    100         }
    101       }
    102     }
    103     return -1L;
    104   }
    105 
    106   @Override
    107   public void onPostExecute(Long callLogEntryId) {
    108     listener.onDeleteBlockedCallTaskComplete(callLogEntryId >= 0);
    109   }
    110 
    111   /** Callback invoked when delete is complete. */
    112   public interface Listener {
    113 
    114     void onDeleteBlockedCallTaskComplete(boolean didFindEntry);
    115   }
    116 
    117   private static class CallLogDeleteBlockedCallQuery {
    118 
    119     static final String[] PROJECTION = new String[] {CallLog.Calls._ID, CallLog.Calls.DATE};
    120 
    121     static final int ID_COLUMN_INDEX = 0;
    122     static final int DATE_COLUMN_INDEX = 1;
    123   }
    124 }
    125