001 /****************************************************************
002 * Licensed to the Apache Software Foundation (ASF) under one *
003 * or more contributor license agreements. See the NOTICE file *
004 * distributed with this work for additional information *
005 * regarding copyright ownership. The ASF licenses this file *
006 * to you under the Apache License, Version 2.0 (the *
007 * "License"); you may not use this file except in compliance *
008 * with the License. You may obtain a copy of the License at *
009 * *
010 * http://www.apache.org/licenses/LICENSE-2.0 *
011 * *
012 * Unless required by applicable law or agreed to in writing, *
013 * software distributed under the License is distributed on an *
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *
015 * KIND, either express or implied. See the License for the *
016 * specific language governing permissions and limitations *
017 * under the License. *
018 ****************************************************************/
019
020
021
022
023 package org.apache.james.protocols.smtp.core.fastfail;
024
025 import java.util.Collection;
026
027 import org.apache.james.protocols.smtp.SMTPRetCode;
028 import org.apache.james.protocols.smtp.SMTPSession;
029 import org.apache.james.protocols.smtp.dsn.DSNStatus;
030 import org.apache.james.protocols.smtp.hook.HookResult;
031 import org.apache.james.protocols.smtp.hook.HookReturnCode;
032 import org.apache.james.protocols.smtp.hook.RcptHook;
033 import org.apache.mailet.MailAddress;
034
035 /**
036 *
037 * This handler can be used to just ignore duplicated recipients.
038 */
039 public class SupressDuplicateRcptHandler implements RcptHook {
040
041 /**
042 * @see org.apache.james.protocols.smtp.hook.RcptHook#doRcpt(org.apache.james.protocols.smtp.SMTPSession, org.apache.mailet.MailAddress, org.apache.mailet.MailAddress)
043 */
044 @SuppressWarnings("unchecked")
045 public HookResult doRcpt(SMTPSession session, MailAddress sender, MailAddress rcpt) {
046 Collection rcptList = (Collection) session.getState().get(SMTPSession.RCPT_LIST);
047
048 // Check if the recipient is already in the rcpt list
049 if(rcptList != null && rcptList.contains(rcpt)) {
050 StringBuilder responseBuffer = new StringBuilder();
051
052 responseBuffer.append(DSNStatus.getStatus(DSNStatus.SUCCESS, DSNStatus.ADDRESS_VALID))
053 .append(" Recipient <")
054 .append(rcpt.toString())
055 .append("> OK");
056 session.getLogger().debug("Duplicate recipient not add to recipient list: " + rcpt.toString());
057 return new HookResult(HookReturnCode.OK,SMTPRetCode.MAIL_OK, responseBuffer.toString());
058 }
059 return new HookResult(HookReturnCode.DECLINED);
060 }
061 }