Zitat von Jens Wahnes <wah...@uni-koeln.de>:
One of our users created a folder with a tilde ("~") character
within the folder name. This kind of folder name is not handled
correctly. When the folder is shown in the folder list, the tilde
character is silently dropped. For instance, if a folder by the
name of "~tilde~" is created, it is shown in the mailbox list as if
it were called "tilde". As a result, all kinds of bad things happen,
e.g. when trying to open the folder, an error message is shown, as
there is no folder named just "tilde" present on the server.
I have seen this happening on a server without UTF-8 support (RFC
6855). Since I don't have access to any IMAP server that does
support the "UTF8=ACCEPT" extension, I don't know if it happens on
those servers as well. Maybe someone else can try to see what
happens there?
Confirmed on Cyrus (without UTF8=ACCEPT capability).
After a very long search, I found out that this problem is caused by
the code in the Horde_Imap_Client_Tokenize class, or more precisely
the code within the "next" method on line 292 or so. There is a
comment attached to the "case" statement in question which reads
"Ignore binary string identifier. PHP strings are binary-safe", but
even after reading quite a bit of the surrounding code, I fail to
understand what is meant by that comment. The only other location I
found which seems to deal with this is on line 209 or so, in the
getLiteralLength method.
Disabling the code that sorts out tilde characters around line 292
of Tokenize.php sure does help to resolve the problem of folder
names with a tilde character being displayed incorrectly in IMP.
AFAICT, this does no harm to folder names that do in fact contain
"binary" characters such as "Äpfel ≠ Birnen". However, I'm not
really sure if this kind of change might still have side effects
that I cannot foresee. Maybe someone more familiar with the
Horde_Imap_Client code can tell if it is safe to disable that
particular piece of code?
I have a local fix, but cannot test it on a UTF8 server. If anyone
could jump in here?
--
Jan Schneider
The Horde Project
http://www.horde.org/
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