/**
* Create the ftpClient and authenticate with the resource.
*
* @throws FileResourceException if an exception occurs during the resource start-up
*/
public void start()
throws InvalidSecurityContextException, IllegalHostException, FileResourceException {
ServiceContact serviceContact = getAndCheckServiceContact();
String host = getServiceContact().getHost();
int port = getServiceContact().getPort();
if (port == -1) {
port = 21;
}
if (getName() == null) {
setName(host + ":" + port);
}
try {
SecurityContext securityContext = getOrCreateSecurityContext("ftp", serviceContact);
PasswordAuthentication credentials = getCredentialsAsPasswordAuthentication(securityContext);
ftpClient = new FTPClient(host, port);
String username = credentials.getUserName();
String password = String.valueOf(credentials.getPassword());
ftpClient.authorize(username, password);
ftpClient.setType(Session.TYPE_IMAGE);
setStarted(true);
} catch (Exception e) {
throw translateException("Error connecting to the FTP server at " + host + ":" + port, e);
}
}
/**
* Equivalent to ls command in the current directory
*
* @throws IOException
* @throws FileResourceException
*/
public Collection<GridFile> list() throws FileResourceException {
List<GridFile> gridFileList = new ArrayList<GridFile>();
try {
ftpClient.setPassive();
ftpClient.setLocalActive();
ftpClient.setType(Session.TYPE_ASCII);
Enumeration<?> list = ftpClient.list().elements();
ftpClient.setType(Session.TYPE_IMAGE);
while (list.hasMoreElements()) {
gridFileList.add(createGridFile(list.nextElement()));
}
return gridFileList;
} catch (Exception e) {
throw translateException("Cannot list the elements of the current directory", e);
}
}
/**
* Equivalent to ls command on the given directory
*
* @throws FileResourceException
*/
public Collection<GridFile> list(String directory) throws FileResourceException {
// Store currentDir
String currentDirectory = getCurrentDirectory();
// Change directory
setCurrentDirectory(directory);
Collection<GridFile> list = null;
try {
ftpClient.setType(Session.TYPE_ASCII);
list = list();
ftpClient.setType(Session.TYPE_IMAGE);
} catch (Exception e) {
throw translateException("Error in list directory", e);
}
// Come back to original directory
setCurrentDirectory(currentDirectory);
return list;
}
