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/*
* @(#)Protocol.java 1.39 07/06/01
*/
package com.sun.mail.iap;
import java.util.Vector;
import java.util.Properties;
import java.io.*;
import java.net.*;
import com.sun.mail.util.*;
/**
* General protocol handling code for IMAP-like protocols. <p>
*
* The Protocol object is multithread safe.
*
* @version 1.39, 07/06/01
* @author John Mani
* @author Max Spivak
* @author Bill Shannon
*/
public class Protocol {
protected String host;
private Socket socket;
// in case we turn on TLS, we'll need these later
protected boolean debug;
protected boolean quote;
protected PrintStream out;
protected Properties props;
protected String prefix;
private boolean connected = false; // did constructor succeed?
private TraceInputStream traceInput; // the Tracer
private volatile ResponseInputStream input;
private TraceOutputStream traceOutput; // the Tracer
private volatile DataOutputStream output;
private int tagCounter = 0;
private volatile Vector handlers = null; // response handlers
private volatile long timestamp;
private static final byte[] CRLF = { (byte)'\r', (byte)'\n'};
/**
* Constructor. <p>
*
* Opens a connection to the given host at given port.
*
* @param host host to connect to
* @param port portnumber to connect to
* @param debug debug mode
* @param out debug output stream
* @param props Properties object used by this protocol
* @param prefix Prefix to prepend to property keys
*/
public Protocol(String host, int port, boolean debug,
PrintStream out, Properties props, String prefix,
boolean isSSL) throws IOException, ProtocolException {
try {
this.host = host;
this.debug = debug;
this.out = out;
this.props = props;
this.prefix = prefix;
socket = SocketFetcher.getSocket(host, port, props, prefix, isSSL);
String s = props.getProperty("mail.debug.quote");
quote = s != null && s.equalsIgnoreCase("true");
initStreams(out);
// Read server greeting
processGreeting(readResponse());
timestamp = System.currentTimeMillis();
connected = true; // must be last statement in constructor
} finally {
/*
* If we get here because an exception was thrown, we need
* to disconnect to avoid leaving a connected socket that
* no one will be able to use because this object was never
* completely constructed.
*/
if (!connected)
disconnect();
}
}
private void initStreams(PrintStream out) throws IOException {
traceInput = new TraceInputStream(socket.getInputStream(), out);
traceInput.setTrace(debug);
traceInput.setQuote(quote);
input = new ResponseInputStream(traceInput);
traceOutput = new TraceOutputStream(socket.getOutputStream(), out);
traceOutput.setTrace(debug);
traceOutput.setQuote(quote);
output = new DataOutputStream(new BufferedOutputStream(traceOutput));
}
/**
* Constructor for debugging.
*/
public Protocol(InputStream in, OutputStream out, boolean debug)
throws IOException {
this.host = "localhost";
this.debug = debug;
this.quote = false;
this.out = System.out;
// XXX - inlined initStreams, won't allow later startTLS
traceInput = new TraceInputStream(in, System.out);
traceInput.setTrace(debug);
traceInput.setQuote(quote);
input = new ResponseInputStream(traceInput);
traceOutput = new TraceOutputStream(out, System.out);
traceOutput.setTrace(debug);
traceOutput.setQuote(quote);
output = new DataOutputStream(new BufferedOutputStream(traceOutput));
timestamp = System.currentTimeMillis();
}
/**
* Returns the timestamp.
*/
public long getTimestamp() {
return timestamp;
}
/**
* Adds a response handler.
*/
public synchronized void addResponseHandler(ResponseHandler h) {
if (handlers == null)
handlers = new Vector();
handlers.addElement(h);
}
/**
* Removed the specified response handler.
*/
public synchronized void removeResponseHandler(ResponseHandler h) {
if (handlers != null)
handlers.removeElement(h);
}
/**
* Notify response handlers
*/
public void notifyResponseHandlers(Response[] responses) {
if (handlers == null)
return;
for (int i = 0; i < responses.length; i++) { // go thru responses
Response r = responses[i];
// skip responses that have already been handled
if (r == null)
continue;
int size = handlers.size();
if (size == 0)
return;
// Need to copy handlers list because handlers can be removed
// when handling a response.
Object[] h = new Object[size];
handlers.copyInto(h);
// dispatch 'em
for (int j = 0; j < size; j++)
((ResponseHandler)h[j]).handleResponse(r);
}
}
protected void processGreeting(Response r) throws ProtocolException {
if (r.isBYE())
throw new ConnectionException(this, r);
}
/**
* Return the Protocol's InputStream.
*/
protected ResponseInputStream getInputStream() {
return input;
}
/**
* Return the Protocol's OutputStream
*/
protected OutputStream getOutputStream() {
return output;
}
/**
* Returns whether this Protocol supports non-synchronizing literals
* Default is false. Subclasses should override this if required
*/
protected synchronized boolean supportsNonSyncLiterals() {
return false;
}
public Response readResponse()
throws IOException, ProtocolException {
return new Response(this);
}
/**
* Return a buffer to be used to read a response.
* The default implementation returns null, which causes
* a new buffer to be allocated for every response.
*
* @since JavaMail 1.4.1
*/
protected ByteArray getResponseBuffer() {
return null;
}
public String writeCommand(String command, Argument args)
throws IOException, ProtocolException {
// assert Thread.holdsLock(this);
// can't assert because it's called from constructor
String tag = "A" + Integer.toString(tagCounter++, 10); // unique tag
output.writeBytes(tag + " " + command);
if (args != null) {
output.write(' ');
args.write(this);
}
output.write(CRLF);
output.flush();
return tag;
}
/**
* Send a command to the server. Collect all responses until either
* the corresponding command completion response or a BYE response
* (indicating server failure). Return all the collected responses.
*
* @param command the command
* @param args the arguments
* @return array of Response objects returned by the server
*/
public synchronized Response[] command(String command, Argument args) {
Vector v = new Vector();
boolean done = false;
String tag = null;
Response r = null;
// write the command
try {
tag = writeCommand(command, args);
} catch (LiteralException lex) {
v.addElement(lex.getResponse());
done = true;
} catch (Exception ex) {
// Convert this into a BYE response
v.addElement(Response.byeResponse(ex));
done = true;
}
while (!done) {
try {
r = readResponse();
} catch (IOException ioex) {
// convert this into a BYE response
r = Response.byeResponse(ioex);
} catch (ProtocolException pex) {
continue; // skip this response
}
v.addElement(r);
if (r.isBYE()) // shouldn't wait for command completion response
done = true;
// If this is a matching command completion response, we are done
if (r.isTagged() && r.getTag().equals(tag))
done = true;
}
Response[] responses = new Response[v.size()];
v.copyInto(responses);
timestamp = System.currentTimeMillis();
return responses;
}
/**
* Convenience routine to handle OK, NO, BAD and BYE responses.
*/
public void handleResult(Response response) throws ProtocolException {
if (response.isOK())
return;
else if (response.isNO())
throw new CommandFailedException(response);
else if (response.isBAD())
throw new BadCommandException(response);
else if (response.isBYE()) {
disconnect();
throw new ConnectionException(this, response);
}
}
/**
* Convenience routine to handle simple IAP commands
* that do not have responses specific to that command.
*/
public void simpleCommand(String cmd, Argument args)
throws ProtocolException {
// Issue command
Response[] r = command(cmd, args);
// dispatch untagged responses
notifyResponseHandlers(r);
// Handle result of this command
handleResult(r[r.length-1]);
}
/**
* Start TLS on the current connection.
* <code>cmd</code> is the command to issue to start TLS negotiation.
* If the command succeeds, we begin TLS negotiation.
*/
public synchronized void startTLS(String cmd)
throws IOException, ProtocolException {
simpleCommand(cmd, null);
socket = SocketFetcher.startTLS(socket, props, prefix);
initStreams(out);
}
/**
* Disconnect.
*/
protected synchronized void disconnect() {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
// ignore it
}
socket = null;
}
}
/**
* Finalizer.
*/
protected void finalize() throws Throwable {
super.finalize();
disconnect();
}
}