james.java

邮件服务器系统 支持SMTP POP3 是著名的Apache写 有一定的参考价值

        context.put( Constants.POSTMASTER, postmaster );

        if (!isLocalServer(postmaster.getHost())) {
            StringBuffer warnBuffer
                = new StringBuffer(320)
                        .append("The specified postmaster address ( ")
                        .append(postmaster)
                        .append(" ) is not a local address.  This is not necessarily a problem, but it does mean that emails addressed to the postmaster will be routed to another server.  For some configurations this may cause problems.");
            getLogger().warn(warnBuffer.toString());
        }

        Configuration userNamesConf = conf.getChild("usernames");
        ignoreCase = userNamesConf.getAttributeAsBoolean("ignoreCase", false);
        enableAliases = userNamesConf.getAttributeAsBoolean("enableAliases", false);
        enableForwarding = userNamesConf.getAttributeAsBoolean("enableForwarding", false);

        //Get localusers
        try {
            localusers = (UsersRepository) usersStore.getRepository("LocalUsers");
        } catch (Exception e) {
            getLogger().error("Cannot open private UserRepository");
            throw e;
        }
        //}
        compMgr.put( UsersRepository.ROLE, (Component)localusers);
        getLogger().info("Local users repository opened");

        Configuration inboxConf = conf.getChild("inboxRepository");
        Configuration inboxRepConf = inboxConf.getChild("repository");
        try {
            localInbox = (MailRepository) mailstore.select(inboxRepConf);
        } catch (Exception e) {
            getLogger().error("Cannot open private MailRepository");
            throw e;
        }
        inboxRootURL = inboxRepConf.getAttribute("destinationURL");

        getLogger().info("Private Repository LocalInbox opened");

        // Add this to comp
        compMgr.put( MailServer.ROLE, this);

        spool = mailstore.getInboundSpool();
        if (getLogger().isDebugEnabled()) {
            getLogger().debug("Got spool");
        }

        // For mailet engine provide MailetContext
        //compMgr.put("org.apache.mailet.MailetContext", this);
        // For AVALON aware mailets and matchers, we put the Component object as
        // an attribute
        attributes.put(Constants.AVALON_COMPONENT_MANAGER, compMgr);

        System.out.println(SOFTWARE_NAME_VERSION);
        getLogger().info("JAMES ...init end");
    }

    /**
     * Place a mail on the spool for processing
     *
     * @param message the message to send
     *
     * @throws MessagingException if an exception is caught while placing the mail
     *                            on the spool
     */
    public void sendMail(MimeMessage message) throws MessagingException {
        MailAddress sender = new MailAddress((InternetAddress)message.getFrom()[0]);
        Collection recipients = new HashSet();
        Address addresses[] = message.getAllRecipients();
        if (addresses != null) {
            for (int i = 0; i < addresses.length; i++) {
                // Javamail treats the "newsgroups:" header field as a
                // recipient, so we want to filter those out.
                if ( addresses[i] instanceof InternetAddress ) {
                    recipients.add(new MailAddress((InternetAddress)addresses[i]));
                }
            }
        }
        sendMail(sender, recipients, message);
    }

    /**
     * Place a mail on the spool for processing
     *
     * @param sender the sender of the mail
     * @param recipients the recipients of the mail
     * @param message the message to send
     *
     * @throws MessagingException if an exception is caught while placing the mail
     *                            on the spool
     */
    public void sendMail(MailAddress sender, Collection recipients, MimeMessage message)
            throws MessagingException {
        sendMail(sender, recipients, message, Mail.DEFAULT);
    }

    /**
     * Place a mail on the spool for processing
     *
     * @param sender the sender of the mail
     * @param recipients the recipients of the mail
     * @param message the message to send
     * @param state the state of the message
     *
     * @throws MessagingException if an exception is caught while placing the mail
     *                            on the spool
     */
    public void sendMail(MailAddress sender, Collection recipients, MimeMessage message, String state)
            throws MessagingException {
        MailImpl mail = new MailImpl(getId(), sender, recipients, message);
        mail.setState(state);
        sendMail(mail);
    }

    /**
     * Place a mail on the spool for processing
     *
     * @param sender the sender of the mail
     * @param recipients the recipients of the mail
     * @param msg an <code>InputStream</code> containing the message
     *
     * @throws MessagingException if an exception is caught while placing the mail
     *                            on the spool
     */
    public void sendMail(MailAddress sender, Collection recipients, InputStream msg)
            throws MessagingException {
        // parse headers
        MailHeaders headers = new MailHeaders(msg);

        // if headers do not contains minimum REQUIRED headers fields throw Exception
        if (!headers.isValid()) {
            throw new MessagingException("Some REQURED header field is missing. Invalid Message");
        }
        ByteArrayInputStream headersIn = new ByteArrayInputStream(headers.toByteArray());
        sendMail(new MailImpl(getId(), sender, recipients, new SequenceInputStream(headersIn, msg)));
    }

    /**
     * Place a mail on the spool for processing
     *
     * @param mail the mail to place on the spool
     *
     * @throws MessagingException if an exception is caught while placing the mail
     *                            on the spool
     */
    public void sendMail(Mail mail) throws MessagingException {
        MailImpl mailimpl = (MailImpl)mail;
        try {
            spool.store(mailimpl);
        } catch (Exception e) {
            try {
                spool.remove(mailimpl);
            } catch (Exception ignored) {
            }
            throw new MessagingException("Exception spooling message: " + e.getMessage(), e);
        }
        if (getLogger().isDebugEnabled()) {
            StringBuffer logBuffer =
                new StringBuffer(64)
                        .append("Mail ")
                        .append(mailimpl.getName())
                        .append(" pushed in spool");
            getLogger().debug(logBuffer.toString());
        }
    }

    /**
     * <p>Retrieve the mail repository for a user</p>
     *
     * <p>For POP3 server only - at the moment.</p>
     *
     * @param userName the name of the user whose inbox is to be retrieved
     *
     * @return the POP3 inbox for the user
     */
    public synchronized MailRepository getUserInbox(String userName) {
        MailRepository userInbox = (MailRepository) null;

        userInbox = (MailRepository) mailboxes.get(userName);

        if (userInbox != null) {
            return userInbox;
        } else if (mailboxes.containsKey(userName)) {
            // we have a problem
            getLogger().error("Null mailbox for non-null key");
            throw new RuntimeException("Error in getUserInbox.");
        } else {
            // need mailbox object
            if (getLogger().isDebugEnabled()) {
                getLogger().debug("Retrieving and caching inbox for " + userName );
            }
            StringBuffer destinationBuffer =
                new StringBuffer(192)
                        .append(inboxRootURL)
                        .append(userName)
                        .append("/");
            String destination = destinationBuffer.toString();
            DefaultConfiguration mboxConf
                = new DefaultConfiguration("repository", "generated:AvalonFileRepository.compose()");
            mboxConf.setAttribute("destinationURL", destination);
            mboxConf.setAttribute("type", "MAIL");
            try {
                userInbox = (MailRepository) mailstore.select(mboxConf);
                mailboxes.put(userName, userInbox);
            } catch (Exception e) {
                if (getLogger().isErrorEnabled())
                {
                    getLogger().error("Cannot open user Mailbox" + e);
                }
                throw new RuntimeException("Error in getUserInbox." + e);
            }
            return userInbox;
        }
    }

    /**
     * Return a new mail id.
     *
     * @return a new mail id
     */
    public String getId() {
        long localCount = -1;
        synchronized (James.class) {
            localCount = count++;
        }
        StringBuffer idBuffer =
            new StringBuffer(64)
                    .append("Mail")
                    .append(System.currentTimeMillis())
                    .append("-")
                    .append(localCount);
        return idBuffer.toString();
    }

    /**
     * The main method.  Should never be invoked, as James must be called
     * from within an Avalon framework container.
     *
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        System.out.println("ERROR!");
        System.out.println("Cannot execute James as a stand alone application.");
        System.out.println("To run James, you need to have the Avalon framework installed.");
        System.out.println("Please refer to the Readme file to know how to run James.");
    }

    //Methods for MailetContext

    /**
     * <p>Get the prioritized list of mail servers for a given host.</p>
     *
     * <p>TODO: This needs to be made a more specific ordered subtype of Collection.</p>
     *
     * @param host
     */
    public Collection getMailServers(String host) {
        DNSServer dnsServer = null;
        try {
            dnsServer = (DNSServer) compMgr.lookup( DNSServer.ROLE );
        } catch ( final ComponentException cme ) {
            getLogger().error("Fatal configuration error - DNS Servers lost!", cme );
            throw new RuntimeException("Fatal configuration error - DNS Servers lost!");
        }
        return dnsServer.findMXRecords(host);
    }

    public Object getAttribute(String key) {
        return attributes.get(key);
    }

    public void setAttribute(String key, Object object) {
        attributes.put(key, object);
    }

    public void removeAttribute(String key) {
        attributes.remove(key);
    }

    public Iterator getAttributeNames() {
        Vector names = new Vector();
        for (Enumeration e = attributes.keys(); e.hasMoreElements(); ) {
            names.add(e.nextElement());
        }
        return names.iterator();
    }

    /**
     * This generates a response to the Return-Path address, or the address of
     * the message's sender if the Return-Path is not available.  Note that
     * this is different than a mail-client's reply, which would use the
     * Reply-To or From header. This will send the bounce with the server's
     * postmaster as the sender.
     */
    public void bounce(Mail mail, String message) throws MessagingException {
        bounce(mail, message, getPostmaster());
    }

    /**
     * This generates a response to the Return-Path address, or the
     * address of the message's sender if the Return-Path is not
     * available.  Note that this is different than a mail-client's
     * reply, which would use the Reply-To or From header.
     *
     * Bounced messages are attached in their entirety (headers and
     * content) and the resulting MIME part type is "message/rfc822".
     *
     * The attachment to the subject of the original message (or "No
     * Subject" if there is no subject in the original message)
     *
     * There are outstanding issues with this implementation revolving
     * around handling of the return-path header.