mod_roster_command: Fix subscription when the "user JID" is a bare domain. Do not attempt to update the roster when the user is bare domain (e.g. a component), since they don't have rosters and the attempt results in an error: $ prosodyctl mod_roster_command subscribe proxy.example.com contact@example.com xxxxxxxxxxFailed to execute command: Error: /usr/lib/prosody/core/rostermanager.lua:104: attempt to concatenate local 'username' (a nil value) stack traceback: /usr/lib/prosody/core/rostermanager.lua:104: in function 'load_roster' /usr/lib/prosody/core/rostermanager.lua:305: in function 'set_contact_pending_out' mod_roster_command.lua:44: in function 'subscribe'

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labels:
- 'Stage-alpha'
summary: Save received chat markers into MUC archives'
...

Introduction
============

Chat markers (XEP-0333) specification states that markers _SHOULD_ be
archived.  This is already happening in one to one conversations in
the personal archives but not in Group Chats.  This module hooks the
_muc-message-is-historic_ event to customize the `mod_muc_mam`
behavior and have the chat markers archived.

Usage
=====

First copy the module to the prosody plugins directory.

Then add "muc\_mam\_markers" to your `modules\_enabled` list in your
MUC component's definition.

No configuration options are available.