001/* 002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and contributors. 003 * 004 * All rights reserved. This program and the accompanying materials 005 * are made available under the terms of the GNU Lesser General Public License 006 * (LGPL) version 2.1 which accompanies this distribution, and is available at 007 * http://www.gnu.org/licenses/lgpl.html 008 * 009 * This library is distributed in the hope that it will be useful, 010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 012 * Lesser General Public License for more details. 013 * 014 * Contributors: 015 * bstefanescu 016 */ 017package org.nuxeo.connect.update.util; 018 019import java.io.File; 020import java.io.FileInputStream; 021import java.io.IOException; 022import java.security.MessageDigest; 023import java.security.NoSuchAlgorithmException; 024 025import org.nuxeo.common.utils.FileUtils; 026import org.nuxeo.connect.update.LocalPackage; 027 028/** 029 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a> 030 */ 031public class IOUtils { 032 033 private IOUtils() { 034 } 035 036 /** 037 * Backup the given file to the package backup directory. The backup file will be returned. The backup file will be 038 * named: MD5ofFilepath_filename. 039 * 040 * @return the name of the backup file. 041 */ 042 public static File backup(LocalPackage pkg, File file) throws IOException { 043 file = file.getCanonicalFile(); 044 String md5 = createMd5(file.getAbsolutePath()); 045 File bak = pkg.getData().getEntry(LocalPackage.BACKUP_DIR); 046 bak.mkdirs(); 047 String name = file.getName(); 048 File bakFile = new File(bak, md5 + "_" + name); 049 FileUtils.copy(file, bakFile); 050 return bakFile; 051 } 052 053 public static String createMd5(String text) throws IOException { 054 MessageDigest digest = getMD5Digest(); 055 digest.update(text.getBytes()); 056 byte[] hash = digest.digest(); 057 return md5ToHex(hash); 058 } 059 060 public static String createMd5(File file) throws IOException { 061 MessageDigest digest = getMD5Digest(); 062 FileInputStream in = new FileInputStream(file); 063 try { 064 byte[] bytes = new byte[64 * 1024]; 065 int r = in.read(bytes); 066 while (r > -1) { 067 if (r > 0) { 068 digest.update(bytes, 0, r); 069 } 070 r = in.read(bytes); 071 } 072 byte[] hash = digest.digest(); 073 return md5ToHex(hash); 074 } finally { 075 in.close(); 076 } 077 } 078 079 protected static MessageDigest getMD5Digest() throws IOException { 080 try { 081 return MessageDigest.getInstance("MD5"); 082 } catch (NoSuchAlgorithmException e) { 083 throw new IOException(e); 084 } 085 } 086 087 public static String md5ToHex(byte[] hash) { 088 StringBuilder hexString = new StringBuilder(); 089 for (byte b : hash) { 090 String hex = Integer.toHexString(0xFF & b); 091 if (hex.length() == 1) { 092 hexString.append('0'); 093 } 094 hexString.append(hex); 095 } 096 return hexString.toString(); 097 } 098 099}