Envelope.java

import java.io.*;
import java.net.*;
import java.util.*;

/* $Id: Envelope.java,v 1.8 1999/09/06 16:43:20 kangasha Exp $ */


/**
 * SMTP envelope for one mail message.
 *
 * @author Jussi Kangasharju
 */
public class Envelope {
    /* SMTP-sender of the message (in this case, contents of From-header. */
    public String Sender;

    /* SMTP-recipient, or contents of To-header. */
    public String Recipient;

    /* Target MX-host */
    public String DestHost;
    public InetAddress DestAddr;
  



    /* The actual message */
    public Message Message;

    /* Create the envelope. */
    public Envelope(Message message, String localServer) throws UnknownHostException {
/* Get sender and recipient. */
Sender = message.getFrom();
Recipient = message.getTo();

/* Get message. We must escape the message to make sure that
  there are no single periods on a line. This would mess up
  sending the mail. */
Message = escapeMessage(message);

/* Take the name of the local mailserver and map it into an
* InetAddress */
DestHost = localServer;
try {
   DestAddr = InetAddress.getByName(DestHost);
} catch (UnknownHostException e) {
   System.out.println("Unknown host: " + DestHost);
   System.out.println(e);
   throw e;
}
return;
    }

    /* Escape the message by doubling all periods at the beginning of
       a line. */
    private Message escapeMessage(Message message) {
String escapedBody = "";
String token;
StringTokenizer parser = new StringTokenizer(message.Body, "\n", true);

while(parser.hasMoreTokens()) {
   token = parser.nextToken();
   if(token.startsWith(".")) {
token = "." + token;
   }
   escapedBody += token;
}
message.Body = escapedBody;
return message;
    }

    /* For printing the envelope. Only for debug. */
    public String toString() {
String res = "Sender: " + Sender + '\n';
res += "Recipient: " + Recipient + '\n';
res += "MX-host: " + DestHost + ", address: " + DestAddr + '\n';
res += "Message:" + '\n';
res += Message.toString();

return res;
    }
}