1 /* 2 * Copyright (C) 2018 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.providers.telephony; 18 19 import android.app.AppOpsManager; 20 import android.content.ContentProvider; 21 import android.content.ContentValues; 22 import android.content.UriMatcher; 23 import android.content.pm.PackageManager; 24 import android.database.Cursor; 25 import android.database.sqlite.SQLiteDatabase; 26 import android.database.sqlite.SQLiteOpenHelper; 27 import android.database.sqlite.SQLiteQueryBuilder; 28 import android.net.Uri; 29 import android.util.Log; 30 31 /** 32 * This is the ContentProvider for the table sms_changes. 33 * This provider is applicable only for Android Auto builds as 34 * this table exists only in Android Auto environment. 35 * 36 * This provider does not notify of changes. 37 * Interested observers should instead listen to notification on sms table, instead. 38 */ 39 public class SmsChangesProvider extends ContentProvider { 40 private final static String TAG = "SmsChangesProvider"; 41 42 private static final String TABLE_SMS_CHANGES = "sms_changes"; 43 44 // Db open helper for tables stored in CE(Credential Encrypted) storage. 45 private SQLiteOpenHelper mCeOpenHelper; 46 47 @Override getType(Uri url)48 public String getType(Uri url) { 49 return null; 50 } 51 52 @Override onCreate()53 public boolean onCreate() { 54 setAppOps(AppOpsManager.OP_READ_SMS, AppOpsManager.OP_WRITE_SMS); 55 mCeOpenHelper = MmsSmsDatabaseHelper.getInstanceForCe(getContext()); 56 return true; 57 } 58 59 60 @Override query(Uri url, String[] projectionIn, String selection, String[] selectionArgs, String sort)61 public Cursor query(Uri url, String[] projectionIn, String selection, 62 String[] selectionArgs, String sort) { 63 // return if FEATURE_AUTOMOTIVE is not set 64 if (!isAutoFeatureSet()) { 65 return null; 66 } 67 68 // Only support one type of query 69 // Caller sends content://mms-sms and other params 70 if (!isUrlSupported(url)) { 71 return null; 72 } 73 74 SQLiteQueryBuilder qb = new SQLiteQueryBuilder(); 75 qb.setTables(TABLE_SMS_CHANGES); 76 SQLiteDatabase db = mCeOpenHelper.getReadableDatabase(); 77 return qb.query(db, projectionIn, selection, selectionArgs, 78 null /* groupBy */, null /* having */, 79 null /* sortOrder */); 80 } 81 82 @Override insert(Uri url, ContentValues initialValues)83 public Uri insert(Uri url, ContentValues initialValues) { 84 return null; 85 } 86 87 @Override delete(Uri url, String where, String[] whereArgs)88 public int delete(Uri url, String where, String[] whereArgs) { 89 // return if FEATURE_AUTOMOTIVE is not set 90 if (!isAutoFeatureSet()) { 91 return 0; 92 } 93 94 // only support deletion of all data from the table 95 if (!isUrlSupported(url)) return 0; 96 97 return mCeOpenHelper.getWritableDatabase().delete(TABLE_SMS_CHANGES, 98 null /* whereClause */, null /* whereArgs */); 99 } 100 isUrlSupported(Uri url)101 private boolean isUrlSupported(Uri url) { 102 if (sURLMatcher.match(url) != SMSCHANGES_URL) { 103 Log.e(TAG, "Invalid or Unsupported request: " + url); 104 return false; 105 } 106 return true; 107 } 108 109 @Override update(Uri url, ContentValues values, String where, String[] whereArgs)110 public int update(Uri url, ContentValues values, String where, String[] whereArgs) { 111 return 0; 112 } 113 isAutoFeatureSet()114 private boolean isAutoFeatureSet() { 115 return getContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_AUTOMOTIVE); 116 } 117 118 private static final int SMSCHANGES_URL = 0; 119 120 private static final UriMatcher sURLMatcher = 121 new UriMatcher(UriMatcher.NO_MATCH); 122 123 static { 124 sURLMatcher.addURI("sms-changes", null, SMSCHANGES_URL); 125 } 126 } 127