Hello,
there seems to be a problem with the listescape plugin and shared INBOX:
=== Preconditions:
- Dovecot 2.2.21 (or 2.2.13)
- IMAP
- Separator /
- Namespace-prefixes "INBOX/" and "shared/%%u/"
- Maildir(++)
- option mail_plugins = acl listescape
- option mail_shared_explicit_inbox = no
- User "owner" shares the INBOX
- ACLs set for another user "reader", so "reader" is able to access the shared INBOX of "owner"
=== Steps to reproduce by using IMAP commands at a telnet session:
- a1 login reader password
- a2 select shared/owner
=== Result: Selecting the shared INBOX fails with a response like: a2 NO Mailbox doesn't exist: shared/owner
=== Expected: The "select" command works.
=== Analysis: The function "mailbox_list_default_get_storage_name" (lib-storage/mailbox-list.c) does not work as expected when using the mail_plugin "listescape". It compares the mailbox name to the namespace prefix. Since the mailbox name is escaped a few lines before, the comparison yields "strings differ", which makes accessing the shared INBOX fail.
For example: for a string vname (mailbox name) "shared/owner", it compares "shared.owner" (escaped string) to the list->ns->prefix which is "shared/owner".
Asuming that the stored prefix should not be escaped, there should be a comparison of the unescaped name to the unescaped prefix (or the escaped name to the escaped prefix?).
=== Patch: Attached is a small patch which shows a possible solution. When applied, the problem is solved, i.e. the shared INBOX is accessible then. Important note: this patch is experimental, it works for the described special case but might not work with a different configuration or might even break things.
Best Regards, Rudolf Körner