| 1 | /**************************************************************** |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one * |
| 3 | * or more contributor license agreements. See the NOTICE file * |
| 4 | * distributed with this work for additional information * |
| 5 | * regarding copyright ownership. The ASF licenses this file * |
| 6 | * to you under the Apache License, Version 2.0 (the * |
| 7 | * "License"); you may not use this file except in compliance * |
| 8 | * with the License. You may obtain a copy of the License at * |
| 9 | * * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 * |
| 11 | * * |
| 12 | * Unless required by applicable law or agreed to in writing, * |
| 13 | * software distributed under the License is distributed on an * |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * |
| 15 | * KIND, either express or implied. See the License for the * |
| 16 | * specific language governing permissions and limitations * |
| 17 | * under the License. * |
| 18 | ****************************************************************/ |
| 19 | |
| 20 | package org.apache.james.jdkim.mailets; |
| 21 | |
| 22 | import java.io.IOException; |
| 23 | |
| 24 | import javax.mail.MessagingException; |
| 25 | import javax.mail.internet.MimeMessage; |
| 26 | import javax.mail.internet.MimeMultipart; |
| 27 | import javax.mail.internet.MimePart; |
| 28 | |
| 29 | import org.apache.mailet.Mail; |
| 30 | import org.apache.mailet.base.GenericMailet; |
| 31 | |
| 32 | /** |
| 33 | * Make sure the message stream is 7bit. Every 8bit part is encoded to |
| 34 | * quoted-printable or base64 and the message is saved. |
| 35 | */ |
| 36 | public class ConvertTo7Bit extends GenericMailet { |
| 37 | |
| 38 | public void service(Mail mail) throws MessagingException { |
| 39 | MimeMessage message = mail.getMessage(); |
| 40 | try { |
| 41 | convertTo7Bit(message); |
| 42 | message.saveChanges(); |
| 43 | } catch (IOException e) { |
| 44 | throw new MessagingException( |
| 45 | "IOException converting message to 7bit: " + e.getMessage(), |
| 46 | e); |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Converts a message to 7 bit. |
| 52 | * |
| 53 | * @param part |
| 54 | */ |
| 55 | private void convertTo7Bit(MimePart part) throws MessagingException, |
| 56 | IOException { |
| 57 | if (part.isMimeType("multipart/*")) { |
| 58 | MimeMultipart parts = (MimeMultipart) part.getContent(); |
| 59 | int count = parts.getCount(); |
| 60 | for (int i = 0; i < count; i++) { |
| 61 | convertTo7Bit((MimePart) parts.getBodyPart(i)); |
| 62 | } |
| 63 | } else if ("8bit".equals(part.getEncoding())) { |
| 64 | // The content may already be in encoded the form (likely with mail |
| 65 | // created from a stream). In that case, just changing the encoding |
| 66 | // to quoted-printable will mangle the result when this is |
| 67 | // transmitted. |
| 68 | // We must first convert the content into its native format, set it |
| 69 | // back, and only THEN set the transfer encoding to force the |
| 70 | // content to be encoded appropriately. |
| 71 | |
| 72 | // if the part doesn't contain text it will be base64 encoded. |
| 73 | String contentTransferEncoding = part.isMimeType("text/*") ? "quoted-printable" |
| 74 | : "base64"; |
| 75 | part.setContent(part.getContent(), part.getContentType()); |
| 76 | part |
| 77 | .setHeader("Content-Transfer-Encoding", |
| 78 | contentTransferEncoding); |
| 79 | part.addHeader("X-MIME-Autoconverted", "from 8bit to " |
| 80 | + contentTransferEncoding + " by " |
| 81 | + getMailetContext().getServerInfo()); |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | } |