selectcommand.java

java 开发的邮件服务器平台。支持以下协议。 协议可以修改为自己的专门标识

/***********************************************************************
 * Copyright (c) 2000-2004 The Apache Software Foundation.             *
 * All rights reserved.                                                *
 * ------------------------------------------------------------------- *
 * Licensed under the Apache License, Version 2.0 (the "License"); you *
 * may not use this file except in compliance with the License. You    *
 * may obtain a copy of the License at:                                *
 *                                                                     *
 *     http://www.apache.org/licenses/LICENSE-2.0                      *
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 * Unless required by applicable law or agreed to in writing, software *
 * distributed under the License is distributed on an "AS IS" BASIS,   *
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or     *
 * implied.  See the License for the specific language governing       *
 * permissions and limitations under the License.                      *
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package org.apache.james.imapserver.commands;

import org.apache.james.imapserver.AccessControlException;
import org.apache.james.imapserver.ACLMailbox;
import org.apache.james.imapserver.ImapRequest;
import org.apache.james.imapserver.ImapSession;
import org.apache.james.imapserver.ImapSessionState;

import java.util.StringTokenizer;
import java.util.List;

class SelectCommand extends AuthenticatedSelectedStateCommand
{
    public SelectCommand()
    {
        this.commandName = "SELECT";

        this.getArgs().add( new AstringArgument( "mailbox" ) );
    }

    protected boolean doProcess( ImapRequest request, ImapSession session, List argValues )
    {
        String command = this.getCommand();

        // selecting a mailbox deselects current mailbox,
        // even if this select fails
        if ( session.getState() == ImapSessionState.SELECTED ) {
            session.getCurrentMailbox().removeMailboxEventListener( session );
            session.getImapHost().releaseMailbox( session.getCurrentUser(), session.getCurrentMailbox() );
            session.setState( ImapSessionState.AUTHENTICATED );
            session.setCurrentMailbox( null );
            session.setCurrentIsReadOnly( false );
        }

        String folder = (String) argValues.get( 0 );
        ACLMailbox mailbox = getMailbox( session, folder, command );
        if ( mailbox == null ) {
            return true;
        }
        else {
            session.setCurrentMailbox( mailbox );
        }

        try { // long tries clause against an AccessControlException
            if ( !session.getCurrentMailbox().hasReadRights( session.getCurrentUser() ) ) {
                session.noResponse( command, "Read access not granted." );
                return true;
            }
            if ( command.equalsIgnoreCase( "SELECT" ) ) {
                if ( !session.getCurrentMailbox().isSelectable( session.getCurrentUser() ) ) {
                    session.noResponse( "Mailbox exists but is not selectable" );
                    return true;
                }
            }

            // Have mailbox with at least read rights. Server setup.
            session.getCurrentMailbox().addMailboxEventListener( session );
            session.setCurrentFolder( folder );
            session.setState( ImapSessionState.SELECTED );
            getLogger().debug( "Current folder for user " + session.getCurrentUser() + " from "
                               + session.getRemoteHost() + "(" + session.getRemoteIP() + ") is "
                               + session.getCurrentFolder() );

            // Inform client
            session.getOut().println( UNTAGGED + SP + "FLAGS ("
                                       + session.getCurrentMailbox().getSupportedFlags() + ")" );
            if ( !session.getCurrentMailbox().allFlags( session.getCurrentUser() ) ) {
                session.untaggedResponse( " [PERMANENTFLAGS ("
                                           + session.getCurrentMailbox().getPermanentFlags( session.getCurrentUser() )
                                           + ") ]" );
            }
            session.checkSize();
            session.getOut().println( UNTAGGED + SP + OK + " [UIDVALIDITY "
                                       + session.getCurrentMailbox().getUIDValidity() + "]" );
            int oldestUnseen = session.getCurrentMailbox().getOldestUnseen( session.getCurrentUser() );
            if ( oldestUnseen > 0 ) {
                session.getOut().println( UNTAGGED + SP + OK + " [UNSEEN "
                                           + oldestUnseen + "] " + oldestUnseen + " is the first unseen" );
            }
            else {
                session.getOut().println( UNTAGGED + SP + OK + " No unseen messages" );
            }
            session.setSequence( session.getCurrentMailbox().listUIDs( session.getCurrentUser() ));

            if ( command.equalsIgnoreCase( "EXAMINE" ) ) {
                session.setCurrentIsReadOnly( true );

                session.okResponse("[READ-ONLY] " + command );
                return true;

            }
            else if ( session.getCurrentMailbox().isReadOnly( session.getCurrentUser() ) ) {
                session.setCurrentIsReadOnly( true );
                session.okResponse( "[READ-ONLY] " + command );
                return true;
            }
            session.okResponse( "[READ-WRITE] " + command );
            return true;
        }
        catch ( AccessControlException ace ) {
            session.noResponse( command, "No such mailbox." );
            session.logACE( ace );
            return true;
        }
    }
}