/**
* Establishes a secure and authenticated context with the server.
*
* @param factory factory for creating the DssContext of the secure session
* @param username specific username to authenticate as.
* @throws IOException on i/o error
* @throws ServerException on server refusal or faulty server behavior
*/
public void authenticate(DssContextFactory factory, String username)
throws IOException, ServerException {
try {
// authenticate
GridFTPControlChannel gridFTPControlChannel =
new GridFTPControlChannel(controlChannel, factory, expectedHostName);
// from now on, the commands and replies
// are protected and pass through gsi wrapped socket
// login
try {
Reply reply =
gridFTPControlChannel.exchange(
new Command("USER", (username == null) ? ":globus-mapping:" : username));
// wu-gsiftp sends intermediate code while
// gssftp send completion reply code
if (!Reply.isPositiveCompletion(reply) && !Reply.isPositiveIntermediate(reply)) {
throw ServerException.embedUnexpectedReplyCodeException(
new UnexpectedReplyCodeException(reply), "User authorization failed.");
}
} catch (FTPReplyParseException rpe) {
throw ServerException.embedFTPReplyParseException(
rpe, "Received faulty reply to USER command.");
}
try {
Reply reply = gridFTPControlChannel.exchange(new Command("PASS", "dummy"));
if (!Reply.isPositiveCompletion(reply)) {
throw ServerException.embedUnexpectedReplyCodeException(
new UnexpectedReplyCodeException(reply), "Bad password.");
}
} catch (FTPReplyParseException rpe) {
throw ServerException.embedFTPReplyParseException(
rpe, "Received faulty reply to PASS command.");
}
this.gSession.authorized = true;
this.username = username;
this.controlChannel = gridFTPControlChannel;
// quietly send version information to the server.
// ignore errors
try {
this.site(usageString);
} catch (Exception ex) {
}
} catch (ServerException | IOException e) {
close();
throw e;
}
}
