Clean up prosody modules with some extra checks (#14020)

* fix: Adds check for jitsi_meet_room not being string.

Oct 20 12:22:50 mod_bosh        error   Traceback[bosh]: /usr/share/jitsi-meet/prosody-plugins/token/util.lib.lua:336: bad argument #1 to 'lower' (string expected, got userdata)
        stack traceback:
        [C]: in function 'lower'
        /usr/share/jitsi-meet/prosody-plugins/token/util.lib.lua:336: in function 'verify_room'
        ...re/jitsi-meet/prosody-plugins/mod_token_verification.lua:78: in function 'verify_user'

* fix: Adds check for missing speaker stats for occupant.

error   Traceback[c2s]: ...itsi-meet/prosody-plugins/mod_speakerstats_component.lua:124: attempt to index field '?' (a nil value)
        stack traceback:
        ...itsi-meet/prosody-plugins/mod_speakerstats_component.lua:124: in function '?'

* fix: Nil check for breakout_rooms.

c2saaaad95a16c0 error   Traceback[c2s]: ...re/jitsi-meet/prosody-plugins/mod_muc_breakout_rooms.lua:345: attempt to index local 'main_room' (a nil value)
        stack traceback:
        ...re/jitsi-meet/prosody-plugins/mod_muc_breakout_rooms.lua:345: in function '?'
        /usr/share/lua/5.2/prosody/util/events.lua:81: in function </usr/share/lua/5.2/prosody/util/events.lua:77>
        (...tail calls...)
        /usr/lib/prosody/modules/muc/muc.lib.lua:496: in function </usr/lib/prosody/modules/muc/muc.lib.lua:492>

* fix: Adds nil check in allowners.

c2saaaae3024810 error   Traceback[c2s]: /usr/share/jitsi-meet/prosody-plugins/mod_muc_allowners.lua:171: attempt to index local 'room' (a nil value)
        stack traceback:
        /usr/share/jitsi-meet/prosody-plugins/mod_muc_allowners.lua:171: in function '?'
        /usr/share/lua/5.2/prosody/util/events.lua:81: in function </usr/share/lua/5.2/prosody/util/events.lua:77>

* fix: Adds nil check in lobby.

mod_bosh        error   Traceback[bosh]: ...share/jitsi-meet/prosody-plugins/mod_muc_lobby_rooms.lua:168: attempt to index local 'lobby_room' (a nil value)
        stack traceback:
        ...share/jitsi-meet/prosody-plugins/mod_muc_lobby_rooms.lua:168: in function '?'
        /usr/share/lua/5.2/prosody/util/filters.lua:25: in function 'filter'
        /usr/lib/prosody/modules/mod_bosh.lua:361: in function 'send'
        /usr/lib/prosody/modules/muc/mod_muc.lua:495: in function '?'

* fix: Fixes nil error in fmuc.

s2sinaaaaf2817260       error   Traceback[s2s]: /usr/share/jitsi-meet/prosody-plugins/mod_fmuc.lua:295: attempt to index local 'occupant' (a nil value)
        stack traceback:
        /usr/share/jitsi-meet/prosody-plugins/mod_fmuc.lua:295: in function '?'
        /usr/share/lua/5.2/prosody/util/events.lua:81: in function </usr/share/lua/5.2/prosody/util/events.lua:77>
        (...tail calls...)
        /usr/lib/prosody/modules/muc/muc.lib.lua:1201: in function </usr/lib/prosody/modules/muc/muc.lib.lua:1194>

* fix: Fixes nil occupant.

c2s55f4d5411dd0 error   Traceback[c2s]: /usr/share/jitsi-meet/prosody-plugins/mod_muc_flip.lua:120: attempt to index local 'kicked_occupant' (a nil value)
        stack traceback:
        /usr/share/jitsi-meet/prosody-plugins/mod_muc_flip.lua:120: in function '?'
        /usr/share/lua/5.2/prosody/util/events.lua:81: in function </usr/share/lua/5.2/prosody/util/events.lua:77>
        (...tail calls...)
        /usr/lib/prosody/modules/muc/muc.lib.lua:791: in function </usr/lib/prosody/modules/muc/muc.lib.lua:616>

* fix: Fixes caching main room.

Objects should not be set in room._data as this field is being serialized and we see errors like.

error   Traceback[c2s]: /usr/share/lua/5.2/prosody/util/serialization.lua:34: Can't serialize userdata
        stack traceback:
        [C]: in function 'error'
        /usr/share/lua/5.2/prosody/util/serialization.lua:34: in function </usr/share/lua/5.2/prosody/util/serialization.lua:33>
        (...tail calls...)
        /usr/share/lua/5.2/prosody/util/serialization.lua:199: in function 'serialize_table'
        /usr/share/lua/5.2/prosody/util/serialization.lua:197: in function 'serialize_table'
        /usr/share/lua/5.2/prosody/util/serialization.lua:197: in function 'serialize_table'
        /usr/share/lua/5.2/prosody/util/serialization.lua:219: in function </usr/share/lua/5.2/prosody/util/serialization.lua:217>
        (...tail calls...)
        /usr/lib/prosody/modules/mod_storage_memory.lua:42: in function </usr/lib/prosody/modules/mod_storage_memory.lua:40>
        (...tail calls...)
        ...re/jitsi-meet/prosody-plugins/mod_muc_breakout_rooms.lua:207: in function 'create_breakout_room'

* fix: Fixes calling save_occupant after changing its role.

* squash: Fixed passed value to type.

resources/prosody-plugins/token/util.lib.lua

@@ -17,6 +17,7 @@ local starts_with = main_util.starts_with;
 local cjson_safe  = require 'cjson.safe'
 local timer = require "util.timer";
 local async = require "util.async";
+local inspect = require 'inspect';
 
 local nr_retries = 3;
 local ssl = require "ssl";
@@ -344,7 +345,11 @@ function Util:verify_room(session, room_address)
 
     local auth_room = session.jitsi_meet_room;
     if auth_room then
-        auth_room = string.lower(auth_room);
+        if type(auth_room) == 'string' then
+            auth_room = string.lower(auth_room);
+        else
+            module:log('warn', 'session.jitsi_meet_room not string: %s', inspect(auth_room));
+        end
     end
     if not self.enableDomainVerification then
         -- if auth_room is missing, this means user is anonymous (no token for