1 /* 2 * Copyright 2022 Google LLC 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 package com.google.android.libraries.mobiledatadownload.file.backends; 17 18 import static com.google.common.io.Files.simplifyPath; 19 20 import android.annotation.TargetApi; 21 import android.net.Uri; 22 import android.os.Build; 23 24 /** Utility class to normalize URIs */ 25 public final class UriNormalizer { 26 UriNormalizer()27 private UriNormalizer() {} 28 29 /** Normalizes the URI to prevent path traversal attacks. Requires SDK 16+. */ 30 @TargetApi(Build.VERSION_CODES.JELLY_BEAN) // for Uri.normalizeScheme() normalizeUri(Uri uri)31 public static Uri normalizeUri(Uri uri) { 32 return uri.normalizeScheme().buildUpon().path(simplifyPath(uri.getPath())).build(); 33 } 34 } 35