1 /*
2  * Copyright 2019 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 public class SqlQueryChecker {
20     private static final String SELECT_TOKEN = "select";
21 
checkToken(String token)22     static void checkToken(String token) {
23         if (SELECT_TOKEN.equals(token.toLowerCase())) {
24             throw new IllegalArgumentException("SELECT token not allowed in query");
25         }
26     }
27 
28     /**
29      * Check the query parameters to see if they contain subqueries. Throws an
30      * {@link IllegalArgumentException} if they do. See
31      * {@link android.content.ContentProvider#query} for the definitions of the arguments.
32      */
checkQueryParametersForSubqueries(String[] projection, String selection, String sortOrder)33     static void checkQueryParametersForSubqueries(String[] projection,
34             String selection, String sortOrder) {
35         if (projection != null) {
36             for (String proj : projection) {
37                 SQLiteTokenizer.tokenize(proj, SQLiteTokenizer.OPTION_NONE,
38                         SqlQueryChecker::checkToken);
39             }
40         }
41         SQLiteTokenizer.tokenize(selection, SQLiteTokenizer.OPTION_NONE,
42                 SqlQueryChecker::checkToken);
43         SQLiteTokenizer.tokenize(sortOrder, SQLiteTokenizer.OPTION_NONE,
44                 SqlQueryChecker::checkToken);
45     }
46 }
47