https://stackoverflow.com/questions/16321172
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RussianHere's a work-around how I finally solved the problem for the moment.
- if file-list-flavor is not supported, get imap URL from drop-event
- open an imap connection with the provided information from the imap URL
- open imap-store, imap-folder, search message by UID and finally fetch message
- convert to *.eml format
Required libraries: Apache Commons I/O and Java Mail API
The following is the drop event implementation:
scrDocuments.setDropTarget(new DropTarget() {
@Override
public synchronized void drop(DropTargetDropEvent evt) {
try {
Transferable transfer = evt.getTransferable();
if(transfer.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
evt.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
List objects = (List)transfer.getTransferData(DataFlavor.javaFileListFlavor);
for(Object object : objects) {
if(object instanceof File) {
File file = (File)object;
// store file ...
}
}
} else {
try {
String url = fetchURL(evt, transfer);
ImapMessage eml = new ImapMessage(url);
File file = eml.fetchMessage();
// store file ...
} catch(Exception ex) {
System.err.println(ex.getMessage());
}
}
} catch(Exception ex) {
System.err.println(ex.getMessage());
} finally {
evt.dropComplete(true);
}
}
});
private String fetchURL(DropTargetDropEvent evt, Transferable transfer) throws IOException, UnsupportedEncodingException, UnsupportedFlavorException {
for(DataFlavor flavor : transfer.getTransferDataFlavors()) {
if(flavor.isRepresentationClassInputStream()) {
if(flavor.getHumanPresentableName().equals("application/x-moz-file-promise-url")) {
evt.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
BufferedReader reader = new BufferedReader(new InputStreamReader((InputStream)transfer.getTransferData(flavor), "ISO-8859-1"));
String fAddress = reader.readLine();
reader.close();
return fAddress;
}
}
}
throw new IOException("No transferable object or stream found.");
}
And the following class looks-up the imap server and fetches the mail:
public class ImapMessage {
private String authority;
private String protocol;
private String host;
private int port;
private String username;
private String password;
private String foldername;
private long msgid;
private String filename;
private Message message;
public ImapMessage(String url) throws IOException, MessagingException {
parseURL(decodeURL(url));
}
@Override
public String toString() {
return "protocol: "+protocol+"\n"+
"host: "+host+"\n"+
"port: "+port+"\n"+
"username: "+username+"\n"+
"password: "+password+"\n"+
"folder: "+foldername+"\n"+
"msgid: "+msgid+"\n"+
"filename: "+filename;
}
private String decodeURL(String url) throws IOException {
if(url!=null && !url.isEmpty()) {
String newurl = "";
for(int i=0; i<url.length(); i+=2) {
newurl+=url.substring(i, i+1);
}
newurl = StringUtils.replace(newurl, "%3E", ">");
newurl = StringUtils.replace(newurl, "%20", " ");
return newurl;
} else {
throw new IOException("The given URL is empty or invalid.");
}
}
private void parseURL(String url) throws IOException, MalformedURLException {
if(url!=null && !url.isEmpty()) {
//<editor-fold defaultstate="collapsed" desc="Parse Protocol">
if(url.startsWith("imaps")) {
url = StringUtils.replace(url, "imaps", "http", 1);
protocol = "imaps";
} else if(url.startsWith("imap")) {
url = StringUtils.replace(url, "imap", "http", 1);
protocol = "imap";
} else {
throw new IOException("Unsupported protocol: "+url.substring(0, url.indexOf("://")));
}
try {
URL newurl = new URL(url);
String path = newurl.getPath();
String query = newurl.getQuery();
authority = newurl.getAuthority();
host = newurl.getHost();
port = newurl.getPort();
username = newurl.getUserInfo();
password = "provide your password here";
foldername = path.substring(path.indexOf(">/")+2, path.lastIndexOf(">"));
msgid = Long.parseLong(path.substring(path.lastIndexOf(">")+1, path.length()));
filename = query.substring(query.indexOf("=")+1, query.length());
} catch (MalformedURLException ex) {
throw ex;
}
} else {
throw new IOException("The given URL is empty or invalid.");
}
}
public File fetchMessage() throws IOException, FileNotFoundException, MessagingException {
Store store = null;
Folder folder = null;
File filepath = new File("/destination/directory");
try {
Properties props = System.getProperties();
props.setProperty("mail.store.protocol", protocol);
Session session = Session.getDefaultInstance(props, null);
// session.setDebug(true);
store = session.getStore(protocol);
store.connect(host, port, username, password);
folder = store.getFolder(foldername);
folder.open(Folder.READ_ONLY);
UIDFolder ufolder = (UIDFolder)folder;
message = ufolder.getMessageByUID(msgid);
if(message!=null) {
File file = null;
if(filename.equals("null")) {
file = new File(filepath.getAbsolutePath()+File.separator+Long.toString(System.nanoTime())+".eml");
} else {
file = new File(filepath.getAbsolutePath()+File.separator+filename);
}
message.writeTo(new FileOutputStream(file));
return file;
} else {
throw new MessagingException("The requested e-mail could not be found on the mail server.");
}
} catch(Exception ex) {
throw ex;
} finally {
if(folder!=null) {
folder.close(true);
}
if(store!=null) {
store.close();
}
}
}
}
