private MessageManager.MetaData selectMailbox(MailboxPath mailboxPath, ImapSession session)
throws MailboxException {
final MailboxManager mailboxManager = getMailboxManager();
final MailboxSession mailboxSession = ImapSessionUtils.getMailboxSession(session);
final MessageManager mailbox = mailboxManager.getMailbox(mailboxPath, mailboxSession);
final SelectedMailbox sessionMailbox;
final SelectedMailbox currentMailbox = session.getSelected();
if (currentMailbox == null || !currentMailbox.getPath().equals(mailboxPath)) {
// QRESYNC EXTENSION
//
// Response with the CLOSE return-code when the currently selected mailbox is closed
// implicitly using the SELECT/EXAMINE command on another mailbox
//
// See rfc5162 3.7. CLOSED Response Code
if (currentMailbox != null) {
getStatusResponseFactory()
.untaggedOk(HumanReadableText.QRESYNC_CLOSED, ResponseCode.closed());
}
session.selected(new SelectedMailboxImpl(getMailboxManager(), session, mailboxPath));
sessionMailbox = session.getSelected();
} else {
// TODO: Check if we need to handle CONDSTORE there too
sessionMailbox = currentMailbox;
}
final MessageManager.MetaData metaData =
mailbox.getMetaData(
!openReadOnly, mailboxSession, MessageManager.MetaData.FetchGroup.FIRST_UNSEEN);
addRecent(metaData, sessionMailbox);
return metaData;
}
private void respond(
String tag,
ImapCommand command,
ImapSession session,
MailboxPath fullMailboxPath,
AbstractMailboxSelectionRequest request,
Responder responder)
throws MailboxException, MessageRangeException {
Long lastKnownUidValidity = request.getLastKnownUidValidity();
Long modSeq = request.getKnownModSeq();
IdRange[] knownSequences = request.getKnownSequenceSet();
UidRange[] knownUids = request.getKnownUidSet();
// Check if a QRESYNC parameter was used and if so if QRESYNC was enabled before.
// If it was not enabled before its needed to return a BAD response
//
// From RFC5162 3.1. QRESYNC Parameter to SELECT/EXAMINE
//
// A server MUST respond with a tagged BAD response if the Quick
// Resynchronization parameter to SELECT/EXAMINE command is specified
// and the client hasn't issued "ENABLE QRESYNC" in the current
// connection.
if (lastKnownUidValidity != null
&& !EnableProcessor.getEnabledCapabilities(session)
.contains(ImapConstants.SUPPORTS_QRESYNC)) {
taggedBad(command, tag, responder, HumanReadableText.QRESYNC_NOT_ENABLED);
return;
}
final MessageManager.MetaData metaData = selectMailbox(fullMailboxPath, session);
final SelectedMailbox selected = session.getSelected();
MessageUid firstUnseen = metaData.getFirstUnseen();
flags(responder, selected);
exists(responder, metaData);
recent(responder, selected);
uidValidity(responder, metaData);
// try to write the UNSEEN message to the client and retry if we fail because of concurrent
// sessions.
//
// See IMAP-345
int retryCount = 0;
while (unseen(responder, firstUnseen, selected, ImapSessionUtils.getMailboxSession(session))
== false) {
// if we not was able to get find the unseen within 5 retries we should just not send it
if (retryCount == 5) {
if (session.getLog().isInfoEnabled()) {
session
.getLog()
.info(
"Unable to uid for unseen message "
+ firstUnseen
+ " in mailbox "
+ selected.getPath());
}
break;
}
firstUnseen = selectMailbox(fullMailboxPath, session).getFirstUnseen();
retryCount++;
}
permanentFlags(responder, metaData, selected);
highestModSeq(responder, metaData, selected);
uidNext(responder, metaData);
if (request.getCondstore()) {
condstoreEnablingCommand(session, responder, metaData, false);
}
// Now do the QRESYNC processing if necessary
//
// If the mailbox does not store the mod-sequence in a permanent way its needed to not process
// the QRESYNC paramters
// The same is true if none are given ;)
if (metaData.isModSeqPermanent() && lastKnownUidValidity != null) {
if (lastKnownUidValidity == metaData.getUidValidity()) {
final MailboxManager mailboxManager = getMailboxManager();
final MailboxSession mailboxSession = ImapSessionUtils.getMailboxSession(session);
final MessageManager mailbox = mailboxManager.getMailbox(fullMailboxPath, mailboxSession);
// If the provided UIDVALIDITY matches that of the selected mailbox, the
// server then checks the last known modification sequence.
//
// The server sends the client any pending flag changes (using FETCH
// responses that MUST contain UIDs) and expunges those that have
// occurred in this mailbox since the provided modification sequence.
SearchQuery sq = new SearchQuery();
sq.andCriteria(SearchQuery.modSeqGreaterThan(request.getKnownModSeq()));
UidRange[] uidSet = request.getUidSet();
if (uidSet == null) {
// See mailbox had some messages stored before, if not we don't need to query at all
MessageUid uidNext = metaData.getUidNext();
if (!uidNext.isFirst()) {
// Use UIDNEXT -1 as max uid as stated in the QRESYNC RFC
uidSet = new UidRange[] {new UidRange(MessageUid.MIN_VALUE, uidNext.previous())};
}
}
if (uidSet != null) {
// RFC5162 3.1. QRESYNC Parameter to SELECT/EXAMINE
//
// Message sequence match data:
//
// A client MAY provide a parenthesized list of a message sequence set
// and the corresponding UID sets. Both MUST be provided in ascending
// order. The server uses this data to restrict the range for which it
// provides expunged message information.
//
//
// Conceptually, the client provides a small sample of sequence numbers
// for which it knows the corresponding UIDs. The server then compares
// each sequence number and UID pair the client provides with the
// current state of the mailbox. If a pair matches, then the client
// knows of any expunges up to, and including, the message, and thus
// will not include that range in the VANISHED response, even if the
// "mod-sequence-value" provided by the client is too old for the server
// to have data of when those messages were expunged.
//
// Thus, if the Nth message number in the first set in the list is 4,
// and the Nth UID in the second set in the list is 8, and the mailbox's
// fourth message has UID 8, then no UIDs equal to or less than 8 are
// present in the VANISHED response. If the (N+1)th message number is
// 12, and the (N+1)th UID is 24, and the (N+1)th message in the mailbox
// has UID 25, then the lowest UID included in the VANISHED response
// would be 9.
if (knownSequences != null && knownUids != null) {
// Add all uids which are contained in the knownuidsset to a List so we can later access
// them via the index
List<MessageUid> knownUidsList = new ArrayList<MessageUid>();
for (UidRange range : knownUids) {
for (MessageUid uid : range) {
knownUidsList.add(uid);
}
}
// loop over the known sequences and check the UID for MSN X again the known UID X
MessageUid firstUid = MessageUid.MIN_VALUE;
int index = 0;
for (IdRange knownSequence : knownSequences) {
boolean done = false;
for (Long uid : knownSequence) {
// Check if we have uids left to check against
if (knownUidsList.size() > index++) {
int msn = uid.intValue();
MessageUid knownUid = knownUidsList.get(index);
// Check if the uid mathc if not we are done here
if (selected.uid(msn).asSet().contains(knownUid)) {
done = true;
break;
} else {
firstUid = knownUid;
}
} else {
done = true;
break;
}
}
// We found the first uid to start with
if (done) {
firstUid = firstUid.next();
// Ok now its time to filter out the IdRanges which we are not interested in
List<UidRange> filteredUidSet = new ArrayList<UidRange>();
for (UidRange r : uidSet) {
if (r.getLowVal().compareTo(firstUid) < 0) {
if (r.getHighVal().compareTo(firstUid) > 0) {
filteredUidSet.add(new UidRange(firstUid, r.getHighVal()));
}
} else {
filteredUidSet.add(r);
}
}
uidSet = filteredUidSet.toArray(new UidRange[0]);
break;
}
}
}
List<MessageRange> ranges = new ArrayList<MessageRange>();
for (UidRange range : uidSet) {
MessageRange messageSet = range.toMessageRange();
if (messageSet != null) {
MessageRange normalizedMessageSet =
normalizeMessageRange(session.getSelected(), messageSet);
ranges.add(normalizedMessageSet);
}
}
// TODO: Reconsider if we can do something to make the handling better. Maybe at least
// cache the triplets for the expunged
// while have the server running. This could maybe allow us to not return every
// expunged message all the time
//
// As we don't store the <<MSN, UID>, <MODSEQ>> in a permanent way its the best to
// just ignore it here.
//
// From RFC5162 4.1. Server Implementations That Don't Store Extra State
//
//
// Strictly speaking, a server implementation that doesn't remember mod-
// sequences associated with expunged messages can be considered
// compliant with this specification. Such implementations return all
// expunged messages specified in the UID set of the UID FETCH
// (VANISHED) command every time, without paying attention to the
// specified CHANGEDSINCE mod-sequence. Such implementations are
// discouraged, as they can end up returning VANISHED responses that are
// bigger than the result of a UID SEARCH command for the same UID set.
//
// Clients that use the message sequence match data can reduce the scope
// of this VANISHED response substantially in the typical case where
// expunges have not happened, or happen only toward the end of the
// mailbox.
//
respondVanished(mailboxSession, mailbox, ranges, modSeq, metaData, responder);
}
taggedOk(responder, tag, command, metaData, HumanReadableText.SELECT);
} else {
taggedOk(responder, tag, command, metaData, HumanReadableText.QRESYNC_UIDVALIDITY_MISMATCH);
}
} else {
taggedOk(responder, tag, command, metaData, HumanReadableText.SELECT);
}
// Reset the saved sequence-set after successful SELECT / EXAMINE
// See RFC 5812 2.1. Normative Description of the SEARCHRES Extension
SearchResUtil.resetSavedSequenceSet(session);
}