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JAMES-1877 Extract a utility for sending bounce
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...ilet/mailets/src/main/java/org/apache/james/transport/mailets/remoteDelivery/Bouncer.java
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| /**************************************************************** | ||
| * Licensed to the Apache Software Foundation (ASF) under one * | ||
| * or more contributor license agreements. See the NOTICE file * | ||
| * distributed with this work for additional information * | ||
| * regarding copyright ownership. The ASF licenses this file * | ||
| * to you 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 * | ||
| * * | ||
| * 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.transport.mailets.remoteDelivery; | ||
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| import java.io.PrintWriter; | ||
| import java.io.StringWriter; | ||
| import java.net.ConnectException; | ||
| import java.net.SocketException; | ||
| import java.net.UnknownHostException; | ||
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| import javax.mail.MessagingException; | ||
| import javax.mail.SendFailedException; | ||
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| import org.apache.mailet.Mail; | ||
| import org.apache.mailet.MailAddress; | ||
| import org.apache.mailet.MailetContext; | ||
| import org.slf4j.Logger; | ||
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| public class Bouncer { | ||
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| public static final String DELIVERY_ERROR = "delivery-error"; | ||
| private final RemoteDeliveryConfiguration configuration; | ||
| private final MessageComposer messageComposer; | ||
| private final MailetContext mailetContext; | ||
| private final Logger logger; | ||
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| public Bouncer(RemoteDeliveryConfiguration configuration, MessageComposer messageComposer, MailetContext mailetContext, Logger logger) { | ||
| this.configuration = configuration; | ||
| this.messageComposer = messageComposer; | ||
| this.mailetContext = mailetContext; | ||
| this.logger = logger; | ||
| } | ||
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| public void bounce(Mail mail, Exception ex) { | ||
| if (mail.getSender() == null) { | ||
| logger.debug("Null Sender: no bounce will be generated for " + mail.getName()); | ||
| } else { | ||
| if (configuration.getBounceProcessor() != null) { | ||
| mail.setAttribute(DELIVERY_ERROR, messageComposer.getErrorMsg(ex)); | ||
| mail.setState(configuration.getBounceProcessor()); | ||
| try { | ||
| mailetContext.sendMail(mail); | ||
| } catch (MessagingException e) { | ||
| logger.debug("Exception re-inserting failed mail: ", e); | ||
| } | ||
| } else { | ||
| bounceWithMailetContext(mail, ex); | ||
| } | ||
| } | ||
| } | ||
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| private void bounceWithMailetContext(Mail mail, Exception ex) { | ||
| logger.debug("Sending failure message " + mail.getName()); | ||
| try { | ||
| mailetContext.bounce(mail, explanationText(mail, ex)); | ||
| } catch (MessagingException me) { | ||
| logger.debug("Encountered unexpected messaging exception while bouncing message: " + me.getMessage()); | ||
| } catch (Exception e) { | ||
| logger.debug("Encountered unexpected exception while bouncing message: " + e.getMessage()); | ||
| } | ||
| } | ||
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| public String explanationText(Mail mail, Exception ex) { | ||
| StringWriter sout = new StringWriter(); | ||
| PrintWriter out = new PrintWriter(sout, true); | ||
| String machine; | ||
| try { | ||
| machine = configuration.getHeloNameProvider().getHeloName(); | ||
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|
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| } catch (Exception e) { | ||
| machine = "[address unknown]"; | ||
| } | ||
| String bounceBuffer = "Hi. This is the James mail server at " + machine + "."; | ||
| out.println(bounceBuffer); | ||
| out.println("I'm afraid I wasn't able to deliver your message to the following addresses."); | ||
| out.println("This is a permanent error; I've given up. Sorry it didn't work out. Below"); | ||
| out.println("I include the list of recipients and the reason why I was unable to deliver"); | ||
| out.println("your message."); | ||
| out.println(); | ||
| for (MailAddress mailAddress : mail.getRecipients()) { | ||
| out.println(mailAddress); | ||
| } | ||
| if (ex instanceof MessagingException) { | ||
| if (((MessagingException) ex).getNextException() == null) { | ||
| out.println(ex.getMessage().trim()); | ||
| } else { | ||
| Exception ex1 = ((MessagingException) ex).getNextException(); | ||
| if (ex1 instanceof SendFailedException) { | ||
| out.println("Remote mail server told me: " + ex1.getMessage().trim()); | ||
| } else if (ex1 instanceof UnknownHostException) { | ||
| out.println("Unknown host: " + ex1.getMessage().trim()); | ||
| out.println("This could be a DNS server error, a typo, or a problem with the recipient's mail server."); | ||
| } else if (ex1 instanceof ConnectException) { | ||
| // Already formatted as "Connection timed out: connect" | ||
| out.println(ex1.getMessage().trim()); | ||
| } else if (ex1 instanceof SocketException) { | ||
| out.println("Socket exception: " + ex1.getMessage().trim()); | ||
| } else { | ||
| out.println(ex1.getMessage().trim()); | ||
| } | ||
| } | ||
| } | ||
| out.println(); | ||
| return sout.toString(); | ||
| } | ||
| } |
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