Chapril/xmpp.chapril.org-ejabberd
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Avoid duplicates of carbon copies

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When multiple resources have the same (highest) priority, the session
manager routes messages sent to their bare JID to each of these
resources.  When another resource has a lower priority but receives
carbon copies, make sure it won't receive multiple copies of such
messages.
This commit is contained in:
Holger Weiss 2014-11-05 19:04:02 +01:00
parent 1d2efcc168
commit 41dc1efde4
1 changed files with 14 additions and 6 deletions
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20
src/mod_carboncopy.erl
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@ -167,6 +167,10 @@ remove_connection(User, Server, Resource, _Status)->
send_copies(JID, To, Packet, Direction)->
{U, S, R} = jlib:jid_tolower(JID),
PrioRes = ejabberd_sm:get_user_present_resources(U, S),
{MaxPrio, MaxRes} = case catch lists:max(PrioRes) of
{Prio, Res} -> {Prio, Res};
_ -> {0, undefined}
end,
IsBareTo = case {Direction, To} of
{received, #jid{lresource = <<>>}} -> true;
@ -180,15 +184,19 @@ send_copies(JID, To, Packet, Direction)->
end,
%% list of JIDs that should receive a carbon copy of this message (excluding the
%% receiver(s) of the original message
TargetJIDs = if IsBareTo ->
MaxPrio = case catch lists:max(PrioRes) of
{Prio, _Res} -> Prio;
_ -> 0
end,
TargetJIDs = case {IsBareTo, R} of
{true, MaxRes} ->
OrigTo = fun(Res) -> lists:member({MaxPrio, Res}, PrioRes) end,
[ {jlib:make_jid({U, S, CCRes}), CC_Version}
|| {CCRes, CC_Version} <- list(U, S), not OrigTo(CCRes) ];
true ->
{true, _} ->
%% The message was sent to our bare JID, and we currently have
%% multiple resources with the same highest priority, so the session
%% manager routes the message to each of them. We create carbon
%% copies only from one of those resources (the one where R equals
%% MaxRes) in order to avoid duplicates.
[];
{false, _} ->
[ {jlib:make_jid({U, S, CCRes}), CC_Version}
|| {CCRes, CC_Version} <- list(U, S), CCRes /= R ]
%TargetJIDs = lists:delete(JID, [ jlib:make_jid({U, S, CCRes}) || CCRes <- list(U, S) ]),