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package com.sun.mail.imap;
import java.io.IOException;
import java.io.PrintStream;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.StringTokenizer;
import java.util.Vector;
import javax.mail.AuthenticationFailedException;
import javax.mail.Folder;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Quota;
import javax.mail.QuotaAwareStore;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.StoreClosedException;
import javax.mail.URLName;
import javax.mail.event.StoreEvent;
import com.sun.mail.iap.BadCommandException;
import com.sun.mail.iap.CommandFailedException;
import com.sun.mail.iap.ConnectionException;
import com.sun.mail.iap.ProtocolException;
import com.sun.mail.iap.Response;
import com.sun.mail.iap.ResponseHandler;
import com.sun.mail.imap.protocol.IMAPProtocol;
import com.sun.mail.imap.protocol.Namespaces;
import com.sun.mail.util.PropUtil;
/**
* This class provides access to an IMAP message store. <p>
*
* Applications that need to make use of IMAP-specific features may cast
* a <code>Store</code> object to an <code>IMAPStore</code> object and
* use the methods on this class. The {@link #getQuota getQuota} and
* {@link #setQuota setQuota} methods support the IMAP QUOTA extension.
* Refer to <A HREF="http://www.ietf.org/rfc/rfc2087.txt">RFC 2087</A>
* for more information. <p>
*
* See the <a href="package-summary.html">com.sun.mail.imap</a> package
* documentation for further information on the IMAP protocol provider. <p>
*
* <strong>WARNING:</strong> The APIs unique to this class should be
* considered <strong>EXPERIMENTAL</strong>. They may be changed in the
* future in ways that are incompatible with applications using the
* current APIs.
*
* @author John Mani
* @author Bill Shannon
* @author Jim Glennon
*/
/*
* This package is implemented over the "imap.protocol" package, which
* implements the protocol-level commands. <p>
*
* A connected IMAPStore maintains a pool of IMAP protocol objects for
* use in communicating with the IMAP server. The IMAPStore will create
* the initial AUTHENTICATED connection and seed the pool with this
* connection. As folders are opened and new IMAP protocol objects are
* needed, the IMAPStore will provide them from the connection pool,
* or create them if none are available. When a folder is closed,
* its IMAP protocol object is returned to the connection pool if the
* pool is not over capacity. The pool size can be configured by setting
* the mail.imap.connectionpoolsize property. <p>
*
* Note that all connections in the connection pool have their response
* handler set to be the Store. When the connection is removed from the
* pool for use by a folder, the response handler is removed and then set
* to either the Folder or to the special nonStoreResponseHandler, depending
* on how the connection is being used. This is probably excessive.
* Better would be for the Protocol object to support only a single
* response handler, which would be set before the connection is used
* and cleared when the connection is in the pool and can't be used. <p>
*
* A mechanism is provided for timing out idle connection pool IMAP
* protocol objects. Timed out connections are closed and removed (pruned)
* from the connection pool. The time out interval can be configured via
* the mail.imap.connectionpooltimeout property. <p>
*
* The connected IMAPStore object may or may not maintain a separate IMAP
* protocol object that provides the store a dedicated connection to the
* IMAP server. This is provided mainly for compatibility with previous
* implementations of JavaMail and is determined by the value of the
* mail.imap.separatestoreconnection property. <p>
*
* An IMAPStore object provides closed IMAPFolder objects thru its list()
* and listSubscribed() methods. A closed IMAPFolder object acquires an
* IMAP protocol object from the store to communicate with the server. When
* the folder is opened, it gets its own protocol object and thus its own,
* separate connection to the server. The store maintains references to
* all 'open' folders. When a folder is/gets closed, the store removes
* it from its list. When the store is/gets closed, it closes all open
* folders in its list, thus cleaning up all open connections to the
* server. <p>
*
* A mutex is used to control access to the connection pool resources.
* Any time any of these resources need to be accessed, the following
* convention should be followed:
*
* synchronized (pool) { // ACQUIRE LOCK
* // access connection pool resources
* } // RELEASE LOCK <p>
*
* The locking relationship between the store and folders is that the
* store lock must be acquired before a folder lock. This is currently only
* applicable in the store's cleanup method. It's important that the
* connection pool lock is not held when calling into folder objects.
* The locking hierarchy is that a folder lock must be acquired before
* any connection pool operations are performed. You never need to hold
* all three locks, but if you hold more than one this is the order you
* have to acquire them in. <p>
*
* That is: Store > Folder, Folder > pool, Store > pool <p>
*
* The IMAPStore implements the ResponseHandler interface and listens to
* BYE or untagged OK-notification events from the server as a result of
* Store operations. IMAPFolder forwards notifications that result from
* Folder operations using the store connection; the IMAPStore ResponseHandler
* is not used directly in this case. <p>
*/
public class IMAPStore extends Store
implements QuotaAwareStore, ResponseHandler {
/**
* A special event type for a StoreEvent to indicate an IMAP
* response, if the mail.imap.enableimapevents property is set.
*/
public static final int RESPONSE = 1000;
private final String name; // name of this protocol
private final int defaultPort; // default IMAP port
private final boolean isSSL; // use SSL?
private final int blksize; // Block size for data requested
// in FETCH requests. Defaults to
// 16K
private final int statusCacheTimeout; // cache Status for 1 second
private final int appendBufferSize; // max size of msg buffered for append
private final int minIdleTime; // minimum idle time
private int port = -1; // port to use
// Auth info
private String host;
private String user;
private String password;
private String proxyAuthUser;
private String authorizationID;
private String saslRealm;
private Namespaces namespaces;
private boolean disableAuthLogin = false; // disable AUTH=LOGIN
private boolean disableAuthPlain = false; // disable AUTH=PLAIN
private boolean enableStartTLS = false; // enable STARTTLS
private boolean requireStartTLS = false; // require STARTTLS
private boolean enableSASL = false; // enable SASL authentication
private String[] saslMechanisms;
private boolean forcePasswordRefresh = false;
// enable notification of IMAP responses
private boolean enableImapEvents = false;
/*
* This field is set in the Store's response handler if we see
* a BYE response. The releaseStore method checks this field
* and if set it cleans up the Store. Field is volatile because
* there's no lock we consistently hold while manipulating it.
*
* Because volatile doesn't really work before JDK 1.5,
* use a lock to protect these two fields.
*/
private volatile boolean connectionFailed = false;
private volatile boolean forceClose = false;
private final Object connectionFailedLock = new Object();
private PrintStream out; // debug output stream
private boolean messageCacheDebug;
// Connection pool info
static class ConnectionPool {
// container for the pool's IMAP protocol objects
private Vector authenticatedConnections = new Vector();
// vectore of open folders
private Vector folders;
// is the store connection being used?
private boolean storeConnectionInUse = false;
// the last time (in millis) the pool was checked for timed out
// connections
private long lastTimePruned;
// flag to indicate whether there is a dedicated connection for
// store commands
private final boolean separateStoreConnection;
// client timeout interval
private final long clientTimeoutInterval;
// server timeout interval
private final long serverTimeoutInterval;
// size of the connection pool
private final int poolSize;
// interval for checking for timed out connections
private final long pruningInterval;
// connection pool debug flag
private final boolean debug;
/*
* The idleState field supports the IDLE command.
* Normally when executing an IMAP command we hold the
* store's lock.
* While executing the IDLE command we can't hold the
* lock or it would prevent other threads from
* entering Store methods even far enough to check whether
* an IDLE command is in progress. We need to check before
* issuing another command so that we can abort the IDLE
* command.
*
* The idleState field is protected by the store's lock.
* The RUNNING state is the normal state and means no IDLE
* command is in progress. The IDLE state means we've issued
* an IDLE command and are reading responses. The ABORTING
* state means we've sent the DONE continuation command and
* are waiting for the thread running the IDLE command to
* break out of its read loop.
*
* When an IDLE command is in progress, the thread calling
* the idle method will be reading from the IMAP connection
* while not holding the sotre's lock.
* It's obviously critical that no other thread try to send a
* command or read from the connection while in this state.
* However, other threads can send the DONE continuation
* command that will cause the server to break out of the IDLE
* loop and send the ending tag response to the IDLE command.
* The thread in the idle method that's reading the responses
* from the IDLE command will see this ending response and
* complete the idle method, setting the idleState field back
* to RUNNING, and notifying any threads waiting to use the
* connection.
*
* All uses of the IMAP connection (IMAPProtocol object) must
* be preceeded by a check to make sure an IDLE command is not
* running, and abort the IDLE command if necessary. This check
* is made while holding the connection pool lock. While
* waiting for the IDLE command to complete, these other threads
* will give up the connection pool lock. This check is done by
* the getStoreProtocol() method.
*/
private static final int RUNNING = 0; // not doing IDLE command
private static final int IDLE = 1; // IDLE command in effect
private static final int ABORTING = 2; // IDLE command aborting
private int idleState = RUNNING;
private IMAPProtocol idleProtocol; // protocol object when IDLE
ConnectionPool(String name, Session session) {
lastTimePruned = System.currentTimeMillis();
PrintStream out = session.getDebugOut();
if (out == null) // should never happen
out = System.out;
debug = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".connectionpool.debug", false);
// check if the default connection pool size is overridden
int size = PropUtil.getIntSessionProperty(session,
"mail." + name + ".connectionpoolsize", -1);
if (size > 0) {
poolSize = size;
if (debug)
out.println("DEBUG: mail.imap.connectionpoolsize: " +
poolSize);
} else
poolSize = 1;
// check if the default client-side timeout value is overridden
int connectionPoolTimeout = PropUtil.getIntSessionProperty(session,
"mail." + name + ".connectionpooltimeout", -1);
if (connectionPoolTimeout > 0) {
clientTimeoutInterval = connectionPoolTimeout;
if (debug)
out.println("DEBUG: mail.imap.connectionpooltimeout: " +
clientTimeoutInterval);
} else
clientTimeoutInterval = 45 * 100; // 45 seconds
// check if the default server-side timeout value is overridden
int serverTimeout = PropUtil.getIntSessionProperty(session,
"mail." + name + ".servertimeout", -1);
if (serverTimeout > 0) {
serverTimeoutInterval = serverTimeout;
if (debug)
out.println("DEBUG: mail.imap.servertimeout: " +
serverTimeoutInterval);
} else
serverTimeoutInterval = 30 * 60 * 1000; // 30 minutes
// check if the default server-side timeout value is overridden
int pruning = PropUtil.getIntSessionProperty(session,
"mail." + name + ".pruninginterval", -1);
if (pruning > 0) {
pruningInterval = pruning;
if (debug)
out.println("DEBUG: mail.imap.pruninginterval: " +
pruningInterval);
} else
pruningInterval = 60 * 1000; // 1 minute
// check to see if we should use a separate (i.e. dedicated)
// store connection
separateStoreConnection =
PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".separatestoreconnection", false);
if (debug && separateStoreConnection)
out.println("DEBUG: dedicate a store connection");
}
}
private final ConnectionPool pool;
/**
* A special response handler for connections that are being used
* to perform operations on behalf of an object other than the Store.
* It DOESN'T cause the Store to be cleaned up if a BYE is seen.
* The BYE may be real or synthetic and in either case just indicates
* that the connection is dead.
*/
private ResponseHandler nonStoreResponseHandler = new ResponseHandler() {
public void handleResponse(Response r) {
// Any of these responses may have a response code.
if (r.isOK() || r.isNO() || r.isBAD() || r.isBYE())
handleResponseCode(r);
if (debug && r.isBYE())
out.println("DEBUG: IMAPStore non-store connection dead");
}
};
/**
* Constructor that takes a Session object and a URLName that
* represents a specific IMAP server.
*/
public IMAPStore(Session session, URLName url) {
this(session, url, "imap", false);
}
/**
* Constructor used by this class and by IMAPSSLStore subclass.
*/
protected IMAPStore(Session session, URLName url,
String name, boolean isSSL) {
super(session, url); // call super constructor
if (url != null)
name = url.getProtocol();
this.name = name;
if (!isSSL)
isSSL = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".ssl.enable", false);
if (isSSL)
this.defaultPort = 993;
else
this.defaultPort = 143;
this.isSSL = isSSL;
debug = session.getDebug();
out = session.getDebugOut();
if (out == null) // should never happen
out = System.out;
boolean partialFetch = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".partialfetch", true);
if (!partialFetch) {
blksize = -1;
if (debug)
out.println("DEBUG: mail.imap.partialfetch: false");
} else {
blksize = PropUtil.getIntSessionProperty(session,
"mail." + name +".fetchsize", 1024 * 16);
if (debug)
out.println("DEBUG: mail.imap.fetchsize: " + blksize);
}
statusCacheTimeout = PropUtil.getIntSessionProperty(session,
"mail." + name + ".statuscachetimeout", 1000);
if (debug)
out.println("DEBUG: mail.imap.statuscachetimeout: " +
statusCacheTimeout);
appendBufferSize = PropUtil.getIntSessionProperty(session,
"mail." + name + ".appendbuffersize", -1);
if (debug)
out.println("DEBUG: mail.imap.appendbuffersize: " +
appendBufferSize);
minIdleTime = PropUtil.getIntSessionProperty(session,
"mail." + name + ".minidletime", 10);
if (debug)
out.println("DEBUG: mail.imap.minidletime: " + minIdleTime);
// check if we should do a PROXYAUTH login
String s = session.getProperty("mail." + name + ".proxyauth.user");
if (s != null) {
proxyAuthUser = s;
if (debug)
out.println("DEBUG: mail.imap.proxyauth.user: " +
proxyAuthUser);
}
// check if AUTH=LOGIN is disabled
disableAuthLogin = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".auth.login.disable", false);
if (debug && disableAuthLogin)
out.println("DEBUG: disable AUTH=LOGIN");
// check if AUTH=PLAIN is disabled
disableAuthPlain = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".auth.plain.disable", false);
if (debug && disableAuthPlain)
out.println("DEBUG: disable AUTH=PLAIN");
// check if STARTTLS is enabled
enableStartTLS = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".starttls.enable", false);
if (debug && enableStartTLS)
out.println("DEBUG: enable STARTTLS");
// check if STARTTLS is required
requireStartTLS = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".starttls.required", false);
if (debug && requireStartTLS)
out.println("DEBUG: require STARTTLS");
// check if SASL is enabled
enableSASL = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".sasl.enable", false);
if (debug && enableSASL)
out.println("DEBUG: enable SASL");
// check if SASL mechanisms are specified
if (enableSASL) {
s = session.getProperty("mail." + name + ".sasl.mechanisms");
if (s != null && s.length() > 0) {
if (debug)
out.println("DEBUG: SASL mechanisms allowed: " + s);
Vector v = new Vector(5);
StringTokenizer st = new StringTokenizer(s, " ,");
while (st.hasMoreTokens()) {
String m = st.nextToken();
if (m.length() > 0)
v.addElement(m);
}
saslMechanisms = new String[v.size()];
v.copyInto(saslMechanisms);
}
}
// check if an authorization ID has been specified
s = session.getProperty("mail." + name + ".sasl.authorizationid");
if (s != null) {
authorizationID = s;
if (debug)
out.println("DEBUG: mail.imap.sasl.authorizationid: " +
authorizationID);
}
// check if a SASL realm has been specified
s = session.getProperty("mail." + name + ".sasl.realm");
if (s != null) {
saslRealm = s;
if (debug)
out.println("DEBUG: mail.imap.sasl.realm: " + saslRealm);
}
// check if forcePasswordRefresh is enabled
forcePasswordRefresh = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".forcepasswordrefresh", false);
if (debug && forcePasswordRefresh)
out.println("DEBUG: enable forcePasswordRefresh");
// check if enableimapevents is enabled
enableImapEvents = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".enableimapevents", false);
if (debug && enableImapEvents)
out.println("DEBUG: enable IMAP events");
// check if message cache debugging set
messageCacheDebug = PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".messagecache.debug", false);
pool = new ConnectionPool(name, session);
}
/**
* Implementation of protocolConnect(). Will create a connection
* to the server and authenticate the user using the mechanisms
* specified by various properties. <p>
*
* The <code>host</code>, <code>user</code>, and <code>password</code>
* parameters must all be non-null. If the authentication mechanism
* being used does not require a password, an empty string or other
* suitable dummy password should be used.
*/
protected synchronized boolean
protocolConnect(String host, int pport, String user, String password)
throws MessagingException {
IMAPProtocol protocol = null;
// check for non-null values of host, password, user
if (host == null || password == null || user == null) {
if (debug)
out.println("DEBUG: protocolConnect returning false" +
", host=" + host +
", user=" + user +
", password=" + (password != null ?
"<non-null>" : "<null>"));
return false;
}
// set the port correctly
if (pport != -1) {
port = pport;
} else {
port = PropUtil.getIntSessionProperty(session,
"mail." + name + ".port", port);
}
// use the default if needed
if (port == -1) {
port = defaultPort;
}
try {
boolean poolEmpty;
synchronized (pool) {
poolEmpty = pool.authenticatedConnections.isEmpty();
}
if (poolEmpty) {
if (debug)
out.println("DEBUG: trying to connect to host \"" + host +
"\", port " + port + ", isSSL " + isSSL);
protocol = new IMAPProtocol(name, host, port,
session.getDebug(),
session.getDebugOut(),
session.getProperties(),
isSSL
);
if (debug)
out.println("DEBUG: protocolConnect login" +
", host=" + host +
", user=" + user +
", password=<non-null>");
login(protocol, user, password);
protocol.addResponseHandler(this);
this.host = host;
this.user = user;
this.password = password;
synchronized (pool) {
pool.authenticatedConnections.addElement(protocol);
}
}
} catch (CommandFailedException cex) {
// login failure, close connection to server
if (protocol != null)
protocol.disconnect();
protocol = null;
throw new AuthenticationFailedException(
cex.getResponse().getRest());
} catch (ProtocolException pex) { // any other exception
throw new MessagingException(pex.getMessage(), pex);
} catch (IOException ioex) {
throw new MessagingException(ioex.getMessage(), ioex);
}
return true;
}
private void login(IMAPProtocol p, String u, String pw)
throws ProtocolException {
// turn on TLS if it's been enabled or required and is supported
if (enableStartTLS || requireStartTLS) {
if (p.hasCapability("STARTTLS")) {
p.startTLS();
// if startTLS succeeds, refresh capabilities
p.capability();
} else if (requireStartTLS) {
if (debug)
out.println("DEBUG: STARTTLS required but not supported");
throw new ProtocolException(
"STARTTLS required but not supported by server");
}
}
if (p.isAuthenticated())
return; // no need to login
/*
* Put a special "marker" in the capabilities list so we can
* detect if the server refreshed the capabilities in the OK
* response.
*/
p.getCapabilities().put("__PRELOGIN__", "");
String authzid;
if (authorizationID != null)
authzid = authorizationID;
else if (proxyAuthUser != null)
authzid = proxyAuthUser;
else
authzid = u;
if (enableSASL)
p.sasllogin(saslMechanisms, saslRealm, authzid, u, pw);
if (p.isAuthenticated())
; // SASL login succeeded, go to bottom
else if (p.hasCapability("AUTH=PLAIN") && !disableAuthPlain)
p.authplain(authzid, u, pw);
else if ((p.hasCapability("AUTH-LOGIN") ||
p.hasCapability("AUTH=LOGIN")) && !disableAuthLogin)
p.authlogin(u, pw);
else if (!p.hasCapability("LOGINDISABLED"))
p.login(u, pw);
else
throw new ProtocolException("No login methods supported!");
if (proxyAuthUser != null)
p.proxyauth(proxyAuthUser);
/*
* If marker is still there, capabilities haven't been refreshed,
* refresh them now.
*/
if (p.hasCapability("__PRELOGIN__")) {
try {
p.capability();
} catch (ConnectionException cex) {
throw cex; // rethrow connection failures
// XXX - assume connection has been closed
} catch (ProtocolException pex) {
// ignore other exceptions that "should never happen"
}
}
}
/**
* Set the user name that will be used for subsequent connections
* after this Store is first connected (for example, when creating
* a connection to open a Folder). This value is overridden
* by any call to the Store's connect method. <p>
*
* Some IMAP servers may provide an authentication ID that can
* be used for more efficient authentication for future connections.
* This authentication ID is provided in a server-specific manner
* not described here. <p>
*
* Most applications will never need to use this method.
*
* @since JavaMail 1.3.3
*/
public synchronized void setUsername(String user) {
this.user = user;
}
/**
* Set the password that will be used for subsequent connections
* after this Store is first connected (for example, when creating
* a connection to open a Folder). This value is overridden
* by any call to the Store's connect method. <p>
*
* Most applications will never need to use this method.
*
* @since JavaMail 1.3.3
*/
public synchronized void setPassword(String password) {
this.password = password;
}
/*
* Get a new authenticated protocol object for this Folder.
* Also store a reference to this folder in our list of
* open folders.
*/
IMAPProtocol getProtocol(IMAPFolder folder)
throws MessagingException {
IMAPProtocol p = null;
// keep looking for a connection until we get a good one
while (p == null) {
// New authenticated protocol objects are either acquired
// from the connection pool, or created when the pool is
// empty or no connections are available. None are available
// if the current pool size is one and the separate store
// property is set or the connection is in use.
synchronized (pool) {
// If there's none available in the pool,
// create a new one.
if (pool.authenticatedConnections.isEmpty() ||
(pool.authenticatedConnections.size() == 1 &&
(pool.separateStoreConnection || pool.storeConnectionInUse))) {
if (debug)
out.println("DEBUG: no connections in the pool, " +
"creating a new one");
try {
if (forcePasswordRefresh)
refreshPassword();
// Use cached host, port and timeout values.
p = new IMAPProtocol(name, host, port,
session.getDebug(),
session.getDebugOut(),
session.getProperties(),
isSSL
);
// Use cached auth info
login(p, user, password);
} catch(Exception ex1) {
if (p != null)
try {
p.disconnect();
} catch (Exception ex2) { }
p = null;
}
if (p == null)
throw new MessagingException("connection failure");
} else {
if (debug)
out.println("DEBUG: connection available -- size: " +
pool.authenticatedConnections.size());
// remove the available connection from the Authenticated queue
p = (IMAPProtocol)pool.authenticatedConnections.lastElement();
pool.authenticatedConnections.removeElement(p);
// check if the connection is still live
long lastUsed = System.currentTimeMillis() - p.getTimestamp();
if (lastUsed > pool.serverTimeoutInterval) {
try {
/*
* Swap in a special response handler that will handle
* alerts, but won't cause the store to be closed and
* cleaned up if the connection is dead.
*/
p.removeResponseHandler(this);
p.addResponseHandler(nonStoreResponseHandler);
p.noop();
p.removeResponseHandler(nonStoreResponseHandler);
p.addResponseHandler(this);
} catch (ProtocolException pex) {
try {
p.removeResponseHandler(nonStoreResponseHandler);
p.disconnect();
} finally {
// don't let any exception stop us
p = null;
continue; // try again, from the top
}
}
}
// remove the store as a response handler.
p.removeResponseHandler(this);
}
// check if we need to look for client-side timeouts
timeoutConnections();
// Add folder to folder-list
if (folder != null) {
if (pool.folders == null)
pool.folders = new Vector();
pool.folders.addElement(folder);
}
}
}
return p;
}
/**
* Get this Store's protocol connection.
*
* When acquiring a store protocol object, it is important to
* use the following steps:
*
* IMAPProtocol p = null;
* try {
* p = getStoreProtocol();
* // perform the command
* } catch (ConnectionException cex) {
* throw new StoreClosedException(this, cex.getMessage());
* } catch (WhateverException ex) {
* // handle it
* } finally {
* releaseStoreProtocol(p);
* }
*/
private IMAPProtocol getStoreProtocol() throws ProtocolException {
IMAPProtocol p = null;
while (p == null) {
synchronized (pool) {
waitIfIdle();
// If there's no authenticated connections available create a
// new one and place it in the authenticated queue.
if (pool.authenticatedConnections.isEmpty()) {
if (pool.debug)
out.println("DEBUG: getStoreProtocol() - no connections " +
"in the pool, creating a new one");
try {
if (forcePasswordRefresh)
refreshPassword();
// Use cached host, port and timeout values.
p = new IMAPProtocol(name, host, port,
session.getDebug(),
session.getDebugOut(),
session.getProperties(),
isSSL
);
// Use cached auth info
login(p, user, password);
} catch(Exception ex1) {
if (p != null)
try {
p.logout();
} catch (Exception ex2) { }
p = null;
}
if (p == null)
throw new ConnectionException(
"failed to create new store connection");
p.addResponseHandler(this);
pool.authenticatedConnections.addElement(p);
} else {
// Always use the first element in the Authenticated queue.
if (pool.debug)
out.println("DEBUG: getStoreProtocol() - " +
"connection available -- size: " +
pool.authenticatedConnections.size());
p = (IMAPProtocol)pool.authenticatedConnections.firstElement();
}
if (pool.storeConnectionInUse) {
try {
// someone else is using the connection, give up
// and wait until they're done
p = null;
pool.wait();
} catch (InterruptedException ex) { }
} else {
pool.storeConnectionInUse = true;
if (pool.debug)
out.println("DEBUG: getStoreProtocol() -- " +
"storeConnectionInUse");
}
timeoutConnections();
}
}
return p;
}
/**
* Get a store protocol object for use by a folder.
*/
IMAPProtocol getFolderStoreProtocol() throws ProtocolException {
IMAPProtocol p = getStoreProtocol();
p.removeResponseHandler(this);
p.addResponseHandler(nonStoreResponseHandler);
return p;
}
/*
* Some authentication systems use one time passwords
* or tokens, so each authentication request requires
* a new password. This "kludge" allows a callback
* to application code to get a new password.
*
* XXX - remove this when SASL support is added
*/
private void refreshPassword() {
if (debug)
out.println("DEBUG: refresh password, user: " + user);
InetAddress addr;
try {
addr = InetAddress.getByName(host);
} catch (UnknownHostException e) {
addr = null;
}
PasswordAuthentication pa =
session.requestPasswordAuthentication(addr, port,
name, null, user);
if (pa != null) {
user = pa.getUserName();
password = pa.getPassword();
}
}
/**
* If a SELECT succeeds, but indicates that the folder is
* READ-ONLY, and the user asked to open the folder READ_WRITE,
* do we allow the open to succeed?
*/
boolean allowReadOnlySelect() {
return PropUtil.getBooleanSessionProperty(session,
"mail." + name + ".allowreadonlyselect", false);
}
/**
* Report whether the separateStoreConnection is set.
*/
boolean hasSeparateStoreConnection() {
return pool.separateStoreConnection;
}
/**
* Report whether connection pool debugging is enabled.
*/
boolean getConnectionPoolDebug() {
return pool.debug;
}
/**
* Report whether message cache debugging is enabled.
*/
boolean getMessageCacheDebug() {
return messageCacheDebug;
}
/**
* Report whether the connection pool is full.
*/
boolean isConnectionPoolFull() {
synchronized (pool) {
if (pool.debug)
out.println("DEBUG: current size: " +
pool.authenticatedConnections.size() +
" pool size: " + pool.poolSize);
return (pool.authenticatedConnections.size() >= pool.poolSize);
}
}
/**
* Release the protocol object back to the connection pool.
*/
void releaseProtocol(IMAPFolder folder, IMAPProtocol protocol) {
synchronized (pool) {
if (protocol != null) {
// If the pool is not full, add the store as a response handler
// and return the protocol object to the connection pool.
if (!isConnectionPoolFull()) {
protocol.addResponseHandler(this);
pool.authenticatedConnections.addElement(protocol);
if (debug)
out.println("DEBUG: added an " +
"Authenticated connection -- size: " +
pool.authenticatedConnections.size());
} else {
if (debug)
out.println("DEBUG: pool is full, not adding " +
"an Authenticated connection");
try {
protocol.logout();
} catch (ProtocolException pex) {};
}
}
if (pool.folders != null)
pool.folders.removeElement(folder);
timeoutConnections();
}
}
/**
* Release the store connection.
*/
private void releaseStoreProtocol(IMAPProtocol protocol) {
// will be called from idle() without the Store lock held,
// but cleanup is synchronized and will acquire the Store lock
if (protocol == null) {
cleanup(); // failed to ever get the connection
return; // nothing to release
}
/*
* Read out the flag that says whether this connection failed
* before releasing the protocol object for others to use.
*/
boolean failed;
synchronized (connectionFailedLock) {
failed = connectionFailed;
connectionFailed = false; // reset for next use
}
// now free the store connection
synchronized (pool) {
pool.storeConnectionInUse = false;
pool.notifyAll(); // in case anyone waiting
if (pool.debug)
out.println("DEBUG: releaseStoreProtocol()");
timeoutConnections();
}
/*
* If the connection died while we were using it, clean up.
* It's critical that the store connection be freed and the
* connection pool not be locked while we do this.
*/
assert !Thread.holdsLock(pool);
if (failed)
cleanup();
}
/**
* Release a store protocol object that was being used by a folder.
*/
void releaseFolderStoreProtocol(IMAPProtocol protocol) {
if (protocol == null)
return; // should never happen
protocol.removeResponseHandler(nonStoreResponseHandler);
protocol.addResponseHandler(this);
synchronized (pool) {
pool.storeConnectionInUse = false;
pool.notifyAll(); // in case anyone waiting
if (pool.debug)
out.println("DEBUG: releaseFolderStoreProtocol()");
timeoutConnections();
}
}
/**
* Empty the connection pool.
*/
private void emptyConnectionPool(boolean force) {
synchronized (pool) {
for (int index = pool.authenticatedConnections.size() - 1;
index >= 0; --index) {
try {
IMAPProtocol p = (IMAPProtocol)
pool.authenticatedConnections.elementAt(index);
p.removeResponseHandler(this);
if (force)
p.disconnect();
else
p.logout();
} catch (ProtocolException pex) {};
}
pool.authenticatedConnections.removeAllElements();
}
if (pool.debug)
out.println("DEBUG: removed all authenticated connections");
}
/**
* Check to see if it's time to shrink the connection pool.
*/
private void timeoutConnections() {
synchronized (pool) {
// If we've exceeded the pruning interval, look for stale
// connections to logout.
if (System.currentTimeMillis() - pool.lastTimePruned >
pool.pruningInterval &&
pool.authenticatedConnections.size() > 1) {
if (pool.debug) {
out.println("DEBUG: checking for connections " +
"to prune: " +
(System.currentTimeMillis() - pool.lastTimePruned));
out.println("DEBUG: clientTimeoutInterval: " +
pool.clientTimeoutInterval);
}
IMAPProtocol p;
// Check the timestamp of the protocol objects in the pool and
// logout if the interval exceeds the client timeout value
// (leave the first connection).
for (int index = pool.authenticatedConnections.size() - 1;
index > 0; index--) {
p = (IMAPProtocol)pool.authenticatedConnections.
elementAt(index);
if (pool.debug) {
out.println("DEBUG: protocol last used: " +
(System.currentTimeMillis() - p.getTimestamp()));
}
if (System.currentTimeMillis() - p.getTimestamp() >
pool.clientTimeoutInterval) {
if (pool.debug) {
out.println("DEBUG: authenticated " +
"connection timed out");
out.println("DEBUG: logging out " +
"the connection");
}
p.removeResponseHandler(this);
pool.authenticatedConnections.removeElementAt(index);
try {
p.logout();
} catch (ProtocolException pex) {}
}
}
pool.lastTimePruned = System.currentTimeMillis();
}
}
}
/**
* Get the block size to use for fetch requests on this Store.
*/
int getFetchBlockSize() {
return blksize;
}
/**
* Get a reference to the session.
*/
Session getSession() {
return session;
}
/**
* Get the number of milliseconds to cache STATUS response.
*/
int getStatusCacheTimeout() {
return statusCacheTimeout;
}
/**
* Get the maximum size of a message to buffer for append.
*/
int getAppendBufferSize() {
return appendBufferSize;
}
/**
* Get the minimum amount of time to delay when returning from idle.
*/
int getMinIdleTime() {
return minIdleTime;
}
/**
* Return true if the specified capability string is in the list
* of capabilities the server announced.
*
* @since JavaMail 1.3.3
*/
public synchronized boolean hasCapability(String capability)
throws MessagingException {
IMAPProtocol p = null;
try {
p = getStoreProtocol();
return p.hasCapability(capability);
} catch (ProtocolException pex) {
throw new MessagingException(pex.getMessage(), pex);
} finally {
releaseStoreProtocol(p);
}
}
/**
* Check whether this store is connected. Override superclass
* method, to actually ping our server connection.
*/
public synchronized boolean isConnected() {
if (!super.isConnected()) {
// if we haven't been connected at all, don't bother with
// the NOOP.
return false;
}
/*
* The below noop() request can:
* (1) succeed - in which case all is fine.
*
* (2) fail because the server returns NO or BAD, in which
* case we ignore it since we can't really do anything.
* (2) fail because a BYE response is obtained from the
* server
* (3) fail because the socket.write() to the server fails,
* in which case the iap.protocol() code converts the
* IOException into a BYE response.
*
* Thus, our BYE handler will take care of closing the Store
* in case our connection is really gone.
*/
IMAPProtocol p = null;
try {
p = getStoreProtocol();
p.noop();
} catch (ProtocolException pex) {
// will return false below
} finally {
releaseStoreProtocol(p);
}
return super.isConnected();
}
/**
* Close this Store.
*/
public synchronized void close() throws MessagingException {
if (!super.isConnected()) // Already closed.
return;
IMAPProtocol protocol = null;
try {
boolean isEmpty;
synchronized (pool) {
// If there's no authenticated connections available
// don't create a new one
isEmpty = pool.authenticatedConnections.isEmpty();
}
/*
* Have to drop the lock before calling cleanup.
* Yes, there's a potential race here. The pool could
* become empty after we check, in which case we'll just
* waste time getting a new connection and closing it.
* Or, the pool could be empty now and not empty by the
* time we get into cleanup, but that's ok because cleanup
* will just close the connection.
*/
if (isEmpty) {
if (pool.debug)
out.println("DEBUG: close() - no connections ");
cleanup();
return;
}
protocol = getStoreProtocol();
/*
* We have to remove the protocol from the pool so that,
* when our response handler processes the BYE response
* and calls cleanup, which calls emptyConnection, that
* we don't try to log out this connection twice.
*/
synchronized (pool) {
pool.authenticatedConnections.removeElement(protocol);
}
/*
* LOGOUT.
*
* Note that protocol.logout() closes the server socket
* connection, regardless of what happens ..
*
* Also note that protocol.logout() results in a BYE
* response (As per rfc 2060, BYE is a *required* response
* to LOGOUT). In fact, even if protocol.logout() fails
* with an IOException (if the server connection is dead),
* iap.Protocol.command() converts that exception into a
* BYE response. So, I depend on my BYE handler to set the
* flag that causes releaseStoreProtocol to do the
* Store cleanup.
*/
protocol.logout();
} catch (ProtocolException pex) {
// Hmm .. will this ever happen ?
throw new MessagingException(pex.getMessage(), pex);
} finally {
releaseStoreProtocol(protocol);
}
}
protected void finalize() throws Throwable {
super.finalize();
close();
}
/**
* Cleanup before dying.
*/
private synchronized void cleanup() {
// if we're not connected, someone beat us to it
if (!super.isConnected()) {
if (debug)
out.println("DEBUG: IMAPStore cleanup, not connected");
return;
}
/*
* If forceClose is true, some thread ran into an error that suggests
* the server might be dead, so we force the folders to close
* abruptly without waiting for the server. Used when
* the store connection times out, for example.
*/
boolean force;
synchronized (connectionFailedLock) {
force = forceClose;
forceClose = false;
connectionFailed = false;
}
if (debug)
out.println("DEBUG: IMAPStore cleanup, force " + force);
Vector foldersCopy = null;
boolean done = true;
// To avoid violating the locking hierarchy, there's no lock we
// can hold that prevents another thread from trying to open a
// folder at the same time we're trying to close all the folders.
// Thus, there's an inherent race condition here. We close all
// the folders we know about and then check whether any new folders
// have been opened in the mean time. We keep trying until we're
// successful in closing all the folders.
for (;;) {
// Make a copy of the folders list so we do not violate the
// folder-connection pool locking hierarchy.
synchronized (pool) {
if (pool.folders != null) {
done = false;
foldersCopy = pool.folders;
pool.folders = null;
} else {
done = true;
}
}
if (done)
break;
// Close and remove any open folders under this Store.
for (int i = 0, fsize = foldersCopy.size(); i < fsize; i++) {
IMAPFolder f = (IMAPFolder)foldersCopy.elementAt(i);
try {
if (force) {
if (debug)
out.println("DEBUG: force folder to close");
// Don't want to wait for folder connection to timeout
// (if, for example, the server is down) so we close
// folders abruptly.
f.forceClose();
} else {
if (debug)
out.println("DEBUG: close folder");
f.close(false);
}
} catch (MessagingException mex) {
// Who cares ?! Ignore 'em.
} catch (IllegalStateException ex) {
// Ditto
}
}
}
synchronized (pool) {
emptyConnectionPool(force);
}
// to set the state and send the closed connection event
try {
super.close();
} catch (MessagingException mex) { }
if (debug)
out.println("DEBUG: IMAPStore cleanup done");
}
/**
* Get the default folder, representing the root of this user's
* namespace. Returns a closed DefaultFolder object.
*/
public synchronized Folder getDefaultFolder() throws MessagingException {
checkConnected();
return new DefaultFolder(this);
}
/**
* Get named folder. Returns a new, closed IMAPFolder.
*/
public synchronized Folder getFolder(String name)
throws MessagingException {
checkConnected();
return new IMAPFolder(name, IMAPFolder.UNKNOWN_SEPARATOR, this);
}
/**
* Get named folder. Returns a new, closed IMAPFolder.
*/
public synchronized Folder getFolder(URLName url)
throws MessagingException {
checkConnected();
return new IMAPFolder(url.getFile(),
IMAPFolder.UNKNOWN_SEPARATOR,
this);
}
/**
* Using the IMAP NAMESPACE command (RFC 2342), return a set
* of folders representing the Personal namespaces.
*/
public Folder[] getPersonalNamespaces() throws MessagingException {
Namespaces ns = getNamespaces();
if (ns == null || ns.personal == null)
return super.getPersonalNamespaces();
return namespaceToFolders(ns.personal, null);
}
/**
* Using the IMAP NAMESPACE command (RFC 2342), return a set
* of folders representing the User's namespaces.
*/
public Folder[] getUserNamespaces(String user)
throws MessagingException {
Namespaces ns = getNamespaces();
if (ns == null || ns.otherUsers == null)
return super.getUserNamespaces(user);
return namespaceToFolders(ns.otherUsers, user);
}
/**
* Using the IMAP NAMESPACE command (RFC 2342), return a set
* of folders representing the Shared namespaces.
*/
public Folder[] getSharedNamespaces() throws MessagingException {
Namespaces ns = getNamespaces();
if (ns == null || ns.shared == null)
return super.getSharedNamespaces();
return namespaceToFolders(ns.shared, null);
}
private synchronized Namespaces getNamespaces() throws MessagingException {
checkConnected();
IMAPProtocol p = null;
if (namespaces == null) {
try {
p = getStoreProtocol();
namespaces = p.namespace();
} catch (BadCommandException bex) {
// NAMESPACE not supported, ignore it
} catch (ConnectionException cex) {
throw new StoreClosedException(this, cex.getMessage());
} catch (ProtocolException pex) {
throw new MessagingException(pex.getMessage(), pex);
} finally {
releaseStoreProtocol(p);
}
}
return namespaces;
}
private Folder[] namespaceToFolders(Namespaces.Namespace[] ns,
String user) {
Folder[] fa = new Folder[ns.length];
for (int i = 0; i < fa.length; i++) {
String name = ns[i].prefix;
if (user == null) {
// strip trailing delimiter
int len = name.length();
if ( len > 0 && name.charAt(len - 1) == ns[i].delimiter)
name = name.substring(0, len - 1);
} else {
// add user
name += user;
}
fa[i] = new IMAPFolder(name, ns[i].delimiter, this, user == null);
}
return fa;
}
/**
* Get the quotas for the named quota root.
* Quotas are controlled on the basis of a quota root, not
* (necessarily) a folder. The relationship between folders
* and quota roots depends on the IMAP server. Some servers
* might implement a single quota root for all folders owned by
* a user. Other servers might implement a separate quota root
* for each folder. A single folder can even have multiple
* quota roots, perhaps controlling quotas for different
* resources.
*
* @param root the name of the quota root
* @return array of Quota objects
* @exception MessagingException if the server doesn't support the
* QUOTA extension
*/
public synchronized Quota[] getQuota(String root)
throws MessagingException {
checkConnected();
Quota[] qa = null;
IMAPProtocol p = null;
try {
p = getStoreProtocol();
qa = p.getQuotaRoot(root);
} catch (BadCommandException bex) {
throw new MessagingException("QUOTA not supported", bex);
} catch (ConnectionException cex) {
throw new StoreClosedException(this, cex.getMessage());
} catch (ProtocolException pex) {
throw new MessagingException(pex.getMessage(), pex);
} finally {
releaseStoreProtocol(p);
}
return qa;
}
/**
* Set the quotas for the quota root specified in the quota argument.
* Typically this will be one of the quota roots obtained from the
* <code>getQuota</code> method, but it need not be.
*
* @param quota the quota to set
* @exception MessagingException if the server doesn't support the
* QUOTA extension
*/
public synchronized void setQuota(Quota quota) throws MessagingException {
checkConnected();
IMAPProtocol p = null;
try {
p = getStoreProtocol();
p.setQuota(quota);
} catch (BadCommandException bex) {
throw new MessagingException("QUOTA not supported", bex);
} catch (ConnectionException cex) {
throw new StoreClosedException(this, cex.getMessage());
} catch (ProtocolException pex) {
throw new MessagingException(pex.getMessage(), pex);
} finally {
releaseStoreProtocol(p);
}
}
private void checkConnected() {
assert Thread.holdsLock(this);
if (!super.isConnected())
throw new IllegalStateException("Not connected");
}
/**
* Response handler method.
*/
public void handleResponse(Response r) {
// Any of these responses may have a response code.
if (r.isOK() || r.isNO() || r.isBAD() || r.isBYE())
handleResponseCode(r);
if (r.isBYE()) {
if (debug)
out.println("DEBUG: IMAPStore connection dead");
// Store's IMAP connection is dead, save the response so that
// releaseStoreProtocol will cleanup later.
synchronized (connectionFailedLock) {
connectionFailed = true;
if (r.isSynthetic())
forceClose = true;
}
return;
}
}
/**
* Use the IMAP IDLE command (see
* <A HREF="http://www.ietf.org/rfc/rfc2177.txt">RFC 2177</A>),
* if supported by the server, to enter idle mode so that the server
* can send unsolicited notifications
* without the need for the client to constantly poll the server.
* Use a <code>ConnectionListener</code> to be notified of
* events. When another thread (e.g., the listener thread)
* needs to issue an IMAP comand for this Store, the idle mode will
* be terminated and this method will return. Typically the caller
* will invoke this method in a loop. <p>
*
* If the mail.imap.enableimapevents property is set, notifications
* received while the IDLE command is active will be delivered to
* <code>ConnectionListener</code>s as events with a type of
* <code>IMAPStore.RESPONSE</code>. The event's message will be
* the raw IMAP response string.
* Note that most IMAP servers will not deliver any events when
* using the IDLE command on a connection with no mailbox selected
* (i.e., this method). In most cases you'll want to use the
* <code>idle</code> method on <code>IMAPFolder</code>. <p>
*
* NOTE: This capability is highly experimental and likely will change
* in future releases. <p>
*
* The mail.imap.minidletime property enforces a minimum delay
* before returning from this method, to ensure that other threads
* have a chance to issue commands before the caller invokes this
* method again. The default delay is 10 milliseconds.
*
* @exception MessagingException if the server doesn't support the
* IDLE extension
* @exception IllegalStateException if the store isn't connected
*
* @since JavaMail 1.4.1
*/
public void idle() throws MessagingException {
IMAPProtocol p = null;
// ASSERT: Must NOT be called with the connection pool
// synchronization lock held.
assert !Thread.holdsLock(pool);
synchronized (this) {
checkConnected();
}
try {
synchronized (pool) {
p = getStoreProtocol();
if (pool.idleState == ConnectionPool.RUNNING) {
p.idleStart();
pool.idleState = ConnectionPool.IDLE;
} else {
// some other thread must be running the IDLE
// command, we'll just wait for it to finish
// without aborting it ourselves
try {
// give up lock and wait to be not idle
pool.wait();
} catch (InterruptedException ex) { }
return;
}
pool.idleProtocol = p;
}
/*
* We gave up the pool lock so that other threads
* can get into the pool far enough to see that we're
* in IDLE and abort the IDLE.
*
* Now we read responses from the IDLE command, especially
* including unsolicited notifications from the server.
* We don't hold the pool lock while reading because
* it protects the idleState and other threads need to be
* able to examine the state.
*
* We hold the pool lock while processing the responses.
*/
for (;;) {
Response r = p.readIdleResponse();
synchronized (pool) {
if (r == null || !p.processIdleResponse(r)) {
pool.idleState = ConnectionPool.RUNNING;
pool.notifyAll();
break;
}
}
if (enableImapEvents && r.isUnTagged()) {
notifyStoreListeners(IMAPStore.RESPONSE, r.toString());
}
}
/*
* Enforce a minimum delay to give time to threads
* processing the responses that came in while we
* were idle.
*/
int minidle = getMinIdleTime();
if (minidle > 0) {
try {
Thread.sleep(minidle);
} catch (InterruptedException ex) { }
}
} catch (BadCommandException bex) {
throw new MessagingException("IDLE not supported", bex);
} catch (ConnectionException cex) {
throw new StoreClosedException(this, cex.getMessage());
} catch (ProtocolException pex) {
throw new MessagingException(pex.getMessage(), pex);
} finally {
synchronized (pool) {
pool.idleProtocol = null;
}
releaseStoreProtocol(p);
}
}
/*
* If an IDLE command is in progress, abort it if necessary,
* and wait until it completes.
* ASSERT: Must be called with the pool's lock held.
*/
private void waitIfIdle() throws ProtocolException {
assert Thread.holdsLock(pool);
while (pool.idleState != ConnectionPool.RUNNING) {
if (pool.idleState == ConnectionPool.IDLE) {
pool.idleProtocol.idleAbort();
pool.idleState = ConnectionPool.ABORTING;
}
try {
// give up lock and wait to be not idle
pool.wait();
} catch (InterruptedException ex) { }
}
}
/**
* Handle notifications and alerts.
* Response must be an OK, NO, BAD, or BYE response.
*/
void handleResponseCode(Response r) {
String s = r.getRest(); // get the text after the response
boolean isAlert = false;
if (s.startsWith("[")) { // a response code
int i = s.indexOf(']');
// remember if it's an alert
if (i > 0 && s.substring(0, i + 1).equalsIgnoreCase("[ALERT]"))
isAlert = true;
// strip off the response code in any event
s = s.substring(i + 1).trim();
}
if (isAlert)
notifyStoreListeners(StoreEvent.ALERT, s);
else if (r.isUnTagged() && s.length() > 0)
// Only send notifications that come with untagged
// responses, and only if there is actually some
// text there.
notifyStoreListeners(StoreEvent.NOTICE, s);
}
}