/src/main/java/com/marimon/Msg2Txt.java

package com.marimon;

/* ====================================================================
 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.
 ==================================================================== */

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;

import org.apache.poi.hsmf.MAPIMessage;
import org.apache.poi.hsmf.datatypes.AttachmentChunks;
import org.apache.poi.hsmf.exceptions.ChunkNotFoundException;

/**
 * Reads one or several Outlook MSG files and for each of them creates a text
 * file from available chunks and a directory that contains attachments.
 * 
 * @author Bruno Girin
 */
public class Msg2Txt {

    /**
     * The stem used to create file names for the text file and the directory
     * that contains the attachments.
     */
    private String fileNameStem;

    /**
     * The Outlook MSG file being processed.
     */
    private final MAPIMessage msg;

    public Msg2Txt(final String fileName) throws IOException {
        fileNameStem = fileName;
        if (fileNameStem.endsWith(".msg") || fileNameStem.endsWith(".MSG")) {
            fileNameStem = fileNameStem.substring(0, fileNameStem.length() - 4);
        }
        msg = new MAPIMessage(fileName);
    }

    /**
     * Processes the message.
     * 
     * @throws IOException
     *             if an exception occurs while writing the message out
     */
    public void processMessage() throws IOException {
        String txtFileName = fileNameStem + ".txt";
        String attDirName = fileNameStem + "-att";
        PrintWriter txtOut = null;

        try {

            String[] headers;
            try {
                headers = msg.getHeaders();
                for (String string : headers) {
                    if (string.contains("From:")) {
                        System.out.println(string);
                    }
                }
            } catch (ChunkNotFoundException e1) {
            }

            txtOut = new PrintWriter(txtFileName);
            try {
                String displayFrom = msg.getDisplayFrom();
                txtOut.println("From: " + displayFrom);
            } catch (ChunkNotFoundException e) {
                // ignore
            }
            try {
                String displayTo = msg.getDisplayTo();
                txtOut.println("To: " + displayTo);
            } catch (ChunkNotFoundException e) {
                // ignore
            }
            try {
                String displayCC = msg.getDisplayCC();
                txtOut.println("CC: " + displayCC);
            } catch (ChunkNotFoundException e) {
                // ignore
            }
            try {
                String displayBCC = msg.getDisplayBCC();
                txtOut.println("BCC: " + displayBCC);
            } catch (ChunkNotFoundException e) {
                // ignore
            }
            try {
                String subject = msg.getSubject();
                txtOut.println("Subject: " + subject);
            } catch (ChunkNotFoundException e) {
                // ignore
            }
            try {
                String body = msg.getTextBody();
                txtOut.println(body);
            } catch (ChunkNotFoundException e) {
                System.err.println("No message body");
            }

            AttachmentChunks[] attachments = msg.getAttachmentFiles();
            if (attachments.length > 0) {
                File d = new File(attDirName);
                if (d.mkdir()) {
                    for (AttachmentChunks attachment : attachments) {
                        processAttachment(attachment, d);
                    }
                } else {
                    System.err.println("Can't create directory " + attDirName);
                }
            }
        } finally {
            if (txtOut != null) {
                txtOut.close();
            }
        }
    }

    /**
     * Processes a single attachment: reads it from the Outlook MSG file and
     * writes it to disk as an individual file.
     * 
     * @param attachment
     *            the chunk group describing the attachment
     * @param dir
     *            the directory in which to write the attachment file
     * @throws IOException
     *             when any of the file operations fails
     */
    public void processAttachment(final AttachmentChunks attachment,
            final File dir) throws IOException {
        String fileName = attachment.attachFileName.toString();
        if (attachment.attachLongFileName != null) {
            fileName = attachment.attachLongFileName.toString();
        }

        File f = new File(dir, fileName);
        OutputStream fileOut = null;
        try {
            fileOut = new FileOutputStream(f);
            fileOut.write(attachment.attachData.getValue());
        } finally {
            if (fileOut != null) {
                fileOut.close();
            }
        }
    }

    /**
     * Processes the list of arguments as a list of names of Outlook MSG files.
     * 
     * @param args
     *            the list of MSG files to process
     */
    public static void main(final String[] args) {
        if (args.length <= 0) {
            System.err.println("No files names provided");
        } else {
            for (int i = 0; i < args.length; i++) {
                try {
                    Msg2Txt processor = new Msg2Txt(args[i]);
                    processor.processMessage();
                    System.out.println("file processed!");
                } catch (IOException e) {
                    System.err.println("Could not process " + args[i] + ": "
                            + e);
                }
            }

        }
    }

}