| /* |
| * 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.ftpserver.command.impl; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.security.DigestInputStream; |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| |
| import org.apache.ftpserver.command.AbstractCommand; |
| import org.apache.ftpserver.ftplet.FtpFile; |
| import org.apache.ftpserver.ftplet.FtpReply; |
| import org.apache.ftpserver.ftplet.FtpRequest; |
| import org.apache.ftpserver.impl.FtpIoSession; |
| import org.apache.ftpserver.impl.FtpServerContext; |
| import org.apache.ftpserver.impl.LocalizedFtpReply; |
| import org.apache.ftpserver.util.IoUtils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * <strong>Internal class, do not use directly.</strong> |
| * |
| * <code>MD5 <SP> <pathname> <CRLF></code><br> |
| * <code>MMD5 <SP> <pathnames> <CRLF></code><br> |
| * |
| * Returns the MD5 value for a file or multiple files according to |
| * draft-twine-ftpmd5-00.txt. |
| * |
| * @author <a href="http://mina.apache.org">Apache MINA Project</a> |
| */ |
| public class MD5 extends AbstractCommand { |
| |
| private final Logger LOG = LoggerFactory.getLogger(MD5.class); |
| |
| /** |
| * Execute command. |
| */ |
| public void execute(final FtpIoSession session, |
| final FtpServerContext context, final FtpRequest request) |
| throws IOException { |
| |
| // reset state variables |
| session.resetState(); |
| |
| boolean isMMD5 = false; |
| |
| if ("MMD5".equals(request.getCommand())) { |
| isMMD5 = true; |
| } |
| |
| // print file information |
| String argument = request.getArgument(); |
| |
| if (argument == null || argument.trim().length() == 0) { |
| session |
| .write(LocalizedFtpReply |
| .translate( |
| session, |
| request, |
| context, |
| FtpReply.REPLY_504_COMMAND_NOT_IMPLEMENTED_FOR_THAT_PARAMETER, |
| "MD5.invalid", null)); |
| return; |
| } |
| |
| String[] fileNames = null; |
| if (isMMD5) { |
| fileNames = argument.split(","); |
| } else { |
| fileNames = new String[] { argument }; |
| } |
| |
| StringBuffer sb = new StringBuffer(); |
| for (int i = 0; i < fileNames.length; i++) { |
| String fileName = fileNames[i].trim(); |
| |
| // get file object |
| FtpFile file = null; |
| |
| try { |
| file = session.getFileSystemView().getFile(fileName); |
| } catch (Exception ex) { |
| LOG.debug("Exception getting the file object: " + fileName, ex); |
| } |
| |
| if (file == null) { |
| session |
| .write(LocalizedFtpReply |
| .translate( |
| session, |
| request, |
| context, |
| FtpReply.REPLY_504_COMMAND_NOT_IMPLEMENTED_FOR_THAT_PARAMETER, |
| "MD5.invalid", fileName)); |
| return; |
| } |
| |
| // check file |
| if (!file.isFile()) { |
| session |
| .write(LocalizedFtpReply |
| .translate( |
| session, |
| request, |
| context, |
| FtpReply.REPLY_504_COMMAND_NOT_IMPLEMENTED_FOR_THAT_PARAMETER, |
| "MD5.invalid", fileName)); |
| return; |
| } |
| |
| InputStream is = null; |
| try { |
| is = file.createInputStream(0); |
| String md5Hash = md5(is); |
| |
| if (i > 0) { |
| sb.append(", "); |
| } |
| boolean nameHasSpaces = fileName.indexOf(' ') >= 0; |
| if(nameHasSpaces) { |
| sb.append('"'); |
| } |
| sb.append(fileName); |
| if(nameHasSpaces) { |
| sb.append('"'); |
| } |
| sb.append(' '); |
| sb.append(md5Hash); |
| |
| } catch (NoSuchAlgorithmException e) { |
| LOG.debug("MD5 algorithm not available", e); |
| session.write(LocalizedFtpReply.translate(session, request, context, |
| FtpReply.REPLY_502_COMMAND_NOT_IMPLEMENTED, |
| "MD5.notimplemened", null)); |
| } finally { |
| IoUtils.close(is); |
| } |
| } |
| if (isMMD5) { |
| session.write(LocalizedFtpReply.translate(session, request, context, |
| 252, "MMD5", sb.toString())); |
| } else { |
| session.write(LocalizedFtpReply.translate(session, request, context, |
| 251, "MD5", sb.toString())); |
| } |
| } |
| |
| /** |
| * @param is |
| * InputStream for which the MD5 hash is calculated |
| * @return The hash of the content in the input stream |
| * @throws IOException |
| * @throws NoSuchAlgorithmException |
| */ |
| private String md5(InputStream is) throws IOException, |
| NoSuchAlgorithmException { |
| MessageDigest digest = MessageDigest.getInstance("MD5"); |
| DigestInputStream dis = new DigestInputStream(is, digest); |
| |
| byte[] buffer = new byte[1024]; |
| |
| int read = dis.read(buffer); |
| while (read > -1) { |
| read = dis.read(buffer); |
| } |
| |
| return new String(encodeHex(dis.getMessageDigest().digest())); |
| } |
| |
| /** |
| * Converts an array of bytes into an array of characters representing the |
| * hexidecimal values of each byte in order. The returned array will be |
| * double the length of the passed array, as it takes two characters to |
| * represent any given byte. |
| * |
| * @param data |
| * a byte[] to convert to Hex characters |
| * @return A char[] containing hexidecimal characters |
| */ |
| public static char[] encodeHex(byte[] data) { |
| |
| int l = data.length; |
| |
| char[] out = new char[l << 1]; |
| |
| // two characters form the hex value. |
| for (int i = 0, j = 0; i < l; i++) { |
| out[j++] = DIGITS[(0xF0 & data[i]) >>> 4]; |
| out[j++] = DIGITS[0x0F & data[i]]; |
| } |
| |
| return out; |
| } |
| |
| /** |
| * Used to build output as Hex |
| */ |
| private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6', |
| '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; |
| |
| } |