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/*
* Copyright 2008 the original author or authors.
*
* Licensed 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.mockftpserver.fake.command;
import org.mockftpserver.core.command.Command;
import org.mockftpserver.core.command.ReplyCodes;
import org.mockftpserver.core.session.Session;
import org.mockftpserver.core.session.SessionKeys;
import org.mockftpserver.core.util.IoUtil;
import org.mockftpserver.fake.filesystem.FileEntry;
import org.mockftpserver.fake.filesystem.FileSystemEntry;
import org.mockftpserver.fake.filesystem.FileSystemException;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* CommandHandler for the RETR command. Handler logic:
* <ol>
* <li>If the user has not logged in, then reply with 530 and terminate</li>
* <li>If the required pathname parameter is missing, then reply with 501 and terminate</li>
* <li>If the pathname parameter does not specify a valid, existing filename, then reply with 550 and terminate</li>
* <li>If the current user does not have read access to the file at the specified path or execute permission to its directory, then reply with 550 and terminate</li>
* <li>Send an initial reply of 150</li>
* <li>Send the contents of the named file across the data connection</li>
* <li>If there is an error reading the file, then reply with 550 and terminate</li>
* <li>Send a final reply with 226</li>
* </ol>
*
* @author Chris Mair
* @version $Revision$ - $Date$
*/
public class RetrCommandHandler extends AbstractFakeCommandHandler {
protected void handle(Command command, Session session) {
verifyLoggedIn(session);
this.replyCodeForFileSystemException = ReplyCodes.READ_FILE_ERROR;
String path = getRealPath(session, command.getRequiredParameter(0));
FileSystemEntry entry = getFileSystem().getEntry(path);
verifyFileSystemCondition(entry != null, path, "filesystem.doesNotExist");
verifyFileSystemCondition(!entry.isDirectory(), path, "filesystem.isNotAFile");
FileEntry fileEntry = (FileEntry) entry;
// User must have read permission to the file
verifyReadPermission(session, path);
// User must have execute permission to the parent directory
verifyExecutePermission(session, getFileSystem().getParent(path));
sendReply(session, ReplyCodes.TRANSFER_DATA_INITIAL_OK);
InputStream input = fileEntry.createInputStream();
session.openDataConnection();
byte[] bytes = null;
try {
bytes = IoUtil.readBytes(input);
}
catch (IOException e) {
LOG.error("Error reading from file [" + fileEntry.getPath() + "]", e);
throw new FileSystemException(fileEntry.getPath(), null, e);
}
finally {
try {
input.close();
}
catch (IOException e) {
LOG.error("Error closing InputStream for file [" + fileEntry.getPath() + "]", e);
}
}
if (isAsciiMode(session)) {
bytes = convertLfToCrLf(bytes);
}
session.sendData(bytes, bytes.length);
session.closeDataConnection();
sendReply(session, ReplyCodes.TRANSFER_DATA_FINAL_OK);
}
/**
* Within the specified byte array, replace all LF (\n) that are NOT preceded by a CR (\r) into CRLF (\r\n).
*
* @param bytes - the bytes to be converted
* @return the result of converting LF to CRLF
*/
protected byte[] convertLfToCrLf(byte[] bytes) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
char lastChar = ' ';
for (int i = 0; i < bytes.length; i++) {
char ch = (char) bytes[i];
if (ch == '\n' && lastChar != '\r') {
out.write('\r');
out.write('\n');
} else {
out.write(bytes[i]);
}
lastChar = ch;
}
return out.toByteArray();
}
private boolean isAsciiMode(Session session) {
// Defaults to true
return session.getAttribute(SessionKeys.ASCII_TYPE) != Boolean.FALSE;
}
}
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