| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hadoop.hdfs; |
| |
| import java.io.IOException; |
| import java.io.UnsupportedEncodingException; |
| import java.util.StringTokenizer; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.security.UserGroupInformation; |
| |
| @InterfaceAudience.Private |
| public class DFSUtil { |
| /** |
| * Whether the pathname is valid. Currently prohibits relative paths, |
| * and names which contain a ":" or "/" |
| */ |
| public static boolean isValidName(String src) { |
| |
| // Path must be absolute. |
| if (!src.startsWith(Path.SEPARATOR)) { |
| return false; |
| } |
| |
| // Check for ".." "." ":" "/" |
| StringTokenizer tokens = new StringTokenizer(src, Path.SEPARATOR); |
| while(tokens.hasMoreTokens()) { |
| String element = tokens.nextToken(); |
| if (element.equals("..") || |
| element.equals(".") || |
| (element.indexOf(":") >= 0) || |
| (element.indexOf("/") >= 0)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Utility class to facilitate junit test error simulation. |
| */ |
| @InterfaceAudience.Private |
| public static class ErrorSimulator { |
| private static boolean[] simulation = null; // error simulation events |
| public static void initializeErrorSimulationEvent(int numberOfEvents) { |
| simulation = new boolean[numberOfEvents]; |
| for (int i = 0; i < numberOfEvents; i++) { |
| simulation[i] = false; |
| } |
| } |
| |
| public static boolean getErrorSimulation(int index) { |
| if(simulation == null) |
| return false; |
| assert(index < simulation.length); |
| return simulation[index]; |
| } |
| |
| public static void setErrorSimulation(int index) { |
| assert(index < simulation.length); |
| simulation[index] = true; |
| } |
| |
| public static void clearErrorSimulation(int index) { |
| assert(index < simulation.length); |
| simulation[index] = false; |
| } |
| } |
| |
| /** |
| * If a keytab has been provided, login as that user. |
| */ |
| public static void login(final Configuration conf, |
| final String keytabFileKey, |
| final String userNameKey) |
| throws IOException { |
| String keytabFilename = conf.get(keytabFileKey); |
| |
| if(keytabFilename == null) |
| return; |
| |
| String user = conf.get(userNameKey, System.getProperty("user.name")); |
| UserGroupInformation.loginUserFromKeytab(user, keytabFilename); |
| } |
| |
| /** |
| * Converts a byte array to a string using UTF8 encoding. |
| */ |
| public static String bytes2String(byte[] bytes) { |
| try { |
| return new String(bytes, "UTF8"); |
| } catch(UnsupportedEncodingException e) { |
| assert false : "UTF8 encoding is not supported "; |
| } |
| return null; |
| } |
| |
| /** |
| * Converts a string to a byte array using UTF8 encoding. |
| */ |
| public static byte[] string2Bytes(String str) { |
| try { |
| return str.getBytes("UTF8"); |
| } catch(UnsupportedEncodingException e) { |
| assert false : "UTF8 encoding is not supported "; |
| } |
| return null; |
| } |
| } |
| |