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package com.sun.mail.pop3;
import java.util.Properties;
import java.lang.reflect.*;
import javax.mail.*;
import javax.mail.internet.*;
import java.io.IOException;
import java.io.EOFException;
import java.util.Collections;
import java.util.Map;
import com.sun.mail.util.PropUtil;
/**
* A POP3 Message Store. Contains only one folder, "INBOX".
*
* See the <a href="package-summary.html">com.sun.mail.pop3</a> package
* documentation for further information on the POP3 protocol provider. <p>
*
* @author Bill Shannon
* @author John Mani
*/
public class POP3Store extends Store {
private String name = "pop3"; // my protocol name
private int defaultPort = 110; // default POP3 port
private boolean isSSL = false; // use SSL?
private Protocol port = null; // POP3 port for self
private POP3Folder portOwner = null; // folder owning port
private String host = null; // host
private int portNum = -1;
private String user = null;
private String passwd = null;
private boolean useStartTLS = false;
private boolean requireStartTLS = false;
private Map capabilities;
// following set here and accessed by other classes in this package
volatile Constructor messageConstructor = null;
volatile boolean rsetBeforeQuit = false;
volatile boolean disableTop = false;
volatile boolean forgetTopHeaders = false;
volatile boolean supportsUidl = true;
public POP3Store(Session session, URLName url) {
this(session, url, "pop3", false);
}
public POP3Store(Session session, URLName url,
String name, boolean isSSL) {
super(session, url);
if (url != null)
name = url.getProtocol();
this.name = name;
if (!isSSL)
isSSL = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".ssl.enable", false);
if (isSSL)
this.defaultPort = 995;
else
this.defaultPort = 110;
this.isSSL = isSSL;
rsetBeforeQuit = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".rsetbeforequit", false);
disableTop = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".disabletop", false);
forgetTopHeaders = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".forgettopheaders", false);
// mail.pop3.starttls.enable enables use of STLS command
useStartTLS = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".starttls.enable", false);
// mail.pop3.starttls.required requires use of STLS command
requireStartTLS = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".starttls.required", false);
String s = session.getProperty("mail." + name + ".message.class");
if (s != null) {
if (session.getDebug())
session.getDebugOut().println(
"DEBUG POP3: message class: " + s);
try {
ClassLoader cl = this.getClass().getClassLoader();
// now load the class
Class messageClass = null;
try {
// First try the "application's" class loader.
// This should eventually be replaced by
// Thread.currentThread().getContextClassLoader().
messageClass = Class.forName(s, false, cl);
} catch (ClassNotFoundException ex1) {
// That didn't work, now try the "system" class loader.
// (Need both of these because JDK 1.1 class loaders
// may not delegate to their parent class loader.)
messageClass = Class.forName(s);
}
Class[] c = {javax.mail.Folder.class, int.class};
messageConstructor = messageClass.getConstructor(c);
} catch (Exception ex) {
if (session.getDebug())
session.getDebugOut().println(
"DEBUG POP3: failed to load message class: " + ex);
}
}
}
protected synchronized boolean protocolConnect(String host, int portNum,
String user, String passwd) throws MessagingException {
// check for non-null values of host, password, user
if (host == null || passwd == null || user == null)
return false;
// if port is not specified, set it to value of mail.pop3.port
// property if it exists, otherwise default to 110
if (portNum == -1)
portNum = PropUtil.getIntSessionProperty(session,
"mail." + name + ".port", -1);
if (portNum == -1)
portNum = defaultPort;
this.host = host;
this.portNum = portNum;
this.user = user;
this.passwd = passwd;
try {
port = getPort(null);
} catch (EOFException eex) {
throw new AuthenticationFailedException(eex.getMessage());
} catch (IOException ioex) {
throw new MessagingException("Connect failed", ioex);
}
return true;
}
/**
* Check whether this store is connected. Override superclass
* method, to actually ping our server connection. <p>
*/
/*
* Note that we maintain somewhat of an illusion of being connected
* even if we're not really connected. This is because a Folder
* can use the connection and close it when it's done. If we then
* ask whether the Store's connected we want the answer to be true,
* as long as we can reconnect at that point. This means that we
* need to be able to reconnect the Store on demand.
*/
public synchronized boolean isConnected() {
if (!super.isConnected())
// if we haven't been connected at all, don't bother with
// the NOOP.
return false;
try {
if (port == null)
port = getPort(null);
else if (!port.noop())
throw new IOException("NOOP failed");
return true;
} catch (IOException ioex) {
// no longer connected, close it down
try {
super.close(); // notifies listeners
} catch (MessagingException mex) {
// ignore it
} finally {
return false;
}
}
}
synchronized Protocol getPort(POP3Folder owner) throws IOException {
Protocol p;
// if we already have a port, remember who's using it
if (port != null && portOwner == null) {
portOwner = owner;
return port;
}
// need a new port, create it and try to login
p = new Protocol(host, portNum, session.getDebug(),
session.getDebugOut(), session.getProperties(), "mail." + name,
isSSL);
if (useStartTLS || requireStartTLS) {
if (p.hasCapability("STLS")) {
p.stls();
// refresh capabilities
p.setCapabilities(p.capa());
} else if (requireStartTLS) {
if (debug)
session.getDebugOut().println(
"DEBUG POP3: STLS required but not supported");
try {
p.quit();
} catch (IOException ioex) {
} finally {
throw new EOFException("STLS required but not supported");
}
}
}
capabilities = p.getCapabilities(); // save for later, may be null
/*
* If we haven't explicitly disabled use of the TOP command,
* and the server has provided its capabilities,
* and the server doesn't support the TOP command,
* disable the TOP command.
*/
if (!disableTop &&
capabilities != null && capabilities.containsKey("TOP")) {
disableTop = true;
session.getDebugOut().println(
"DEBUG POP3: server doesn't support TOP, disabling it");
}
supportsUidl = capabilities == null || capabilities.containsKey("UIDL");
String msg = null;
if ((msg = p.login(user, passwd)) != null) {
try {
p.quit();
} catch (IOException ioex) {
} finally {
throw new EOFException(msg);
}
}
/*
* If a Folder closes the port, and then a Folder
* is opened, the Store won't have a port. In that
* case, the getPort call will come from Folder.open,
* but we need to keep track of the port in the Store
* so that a later call to Folder.isOpen, which calls
* Store.isConnected, will use the same port.
*/
if (port == null && owner != null) {
port = p;
portOwner = owner;
}
if (portOwner == null)
portOwner = owner;
return p;
}
synchronized void closePort(POP3Folder owner) {
if (portOwner == owner) {
port = null;
portOwner = null;
}
}
public synchronized void close() throws MessagingException {
try {
if (port != null)
port.quit();
} catch (IOException ioex) {
} finally {
port = null;
// to set the state and send the closed connection event
super.close();
}
}
public Folder getDefaultFolder() throws MessagingException {
checkConnected();
return new DefaultFolder(this);
}
/**
* Only the name "INBOX" is supported.
*/
public Folder getFolder(String name) throws MessagingException {
checkConnected();
return new POP3Folder(this, name);
}
public Folder getFolder(URLName url) throws MessagingException {
checkConnected();
return new POP3Folder(this, url.getFile());
}
/**
* Return a Map of the capabilities the server provided,
* as per RFC 2449. If the server doesn't support RFC 2449,
* an emtpy Map is returned. The returned Map can not be modified.
* The key to the Map is the upper case capability name as
* a String. The value of the entry is the entire String
* capability line returned by the server. <p>
*
* For example, to check if the server supports the STLS capability, use:
* <code>if (store.capabilities().containsKey("STLS")) ...</code>
*
* @return Map of capabilities
* @since JavaMail 1.4.3
*/
public Map capabilities() throws MessagingException {
Map c = capabilities; // atomic read of pointer
if (c != null)
return Collections.unmodifiableMap(c);
else
return Collections.emptyMap();
}
protected void finalize() throws Throwable {
super.finalize();
if (port != null) // don't force a connection attempt
close();
}
private void checkConnected() throws MessagingException {
if (!super.isConnected())
throw new MessagingException("Not connected");
}
}
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