Tickets :: Comment on [#1620] infinite loop in IMAP folder listing

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Comment	> I have confirmed that Horde (though, I use Horde just for IMP, but > from what I can tell the bug is in the underlying Horde IMAP classes) > has a bug that: > > > > 1) Ignores the LATT_NOINFERIORS flag for folders. > > and/or > > 2) Ignores that the folder "delimiter" is empty() for subfolders that > it should not query. > > > > I was able to confirm the bug by writing a very simple PHP script > which lists IMAP folders. I was able to duplicate the bug that IMAP > does by incorrectly formatting subfolder queries. > > > > What I mean by that is, if you have a folder called "Blah" in the > parent list (and it does not have the LATT_NOINFERIORS flag and does > have a delimiter) and you try to list folders under it, you would > query "Blah/%" for example (assuming / is the delimiter). If that > query yeilds another box called "Foo" (that also does not have the > LATT_NOINFERIORS flag and does have a delimiter), you should be > querying "Blah/Foo/%" next time. > > > > However, it appears as though Horde is ignoring the parent folder > when looking for subfolders of subfolders. If it does this, when it > sees "Foo", it then issues a query for "Foo/%". > > > > In my particular case, it was in fact that the subfolder "Foo" (as an > example) did have the LATT_NOINFERIORS flag set as well as a > delimiter set, so it should not have been queried (for two reasons). > Because it was also improperly querying the subfolder, it was causing > an infinite loop which probably nobody ever encounted due to the > weird way my particular IMAP daemon works (SmartMax IMAPMax5). > > > > My problem is because the IMAP daemon reports that beneath every > folder, there is another folder called "INBOX". This "INBOX" > subfolder has the LATT_NOINFERIORS flag set and does not have a > delimiter so it technically should not have been queried, but it was. > That caused it to query "INBOX/%" (rather than "Trash/INBOX/%" for > example). This then caused the IMAP daemon to report a folder called > INBOX under the INBOX folder, which caused an infinite loop. > > > > If you take in to consideration the LATT_NOINFERIORS flag, the loop > is stopped because the INBOX subfolders apparently all have that flag > set. > > > > If you take in to consideration the presense of the folder delimiter > (for the folder you're querying), the loop is also stopped because > the subfolders do not have a delimiter. > > > > If you take in to consideration both cases, the loop is also stopped. > > > > I have attached my test script (minus IMAP credentials that query my > IMAP server). The code may not be streamlined, but it demonstrates > proper IMAP folder querying. > > > > Eli.
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