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-- XEP-0280: Message Carbons implementation for Prosody
-- Copyright (C) 2011-2016 Kim Alvefur
--
-- This file is MIT/X11 licensed.
local st = require "util.stanza";
local jid_bare = require "util.jid".bare;
local xmlns_carbons = "urn:xmpp:carbons:2";
local xmlns_forward = "urn:xmpp:forward:0";
local full_sessions, bare_sessions = prosody.full_sessions, prosody.bare_sessions;
local function toggle_carbons(event)
local origin, stanza = event.origin, event.stanza;
local state = stanza.tags[1].name;
module:log("debug", "%s %sd carbons", origin.full_jid, state);
origin.want_carbons = state == "enable" and stanza.tags[1].attr.xmlns;
origin.send(st.reply(stanza));
return true;
end
module:hook("iq-set/self/"..xmlns_carbons..":disable", toggle_carbons);
module:hook("iq-set/self/"..xmlns_carbons..":enable", toggle_carbons);
local function message_handler(event, c2s)
local origin, stanza = event.origin, event.stanza;
local orig_type = stanza.attr.type or "normal";
local orig_from = stanza.attr.from;
local orig_to = stanza.attr.to;
if not(orig_type == "chat" or orig_type == "normal" and stanza:get_child("body")) then
return -- Only chat type messages
end
-- Stanza sent by a local client
local bare_jid = jid_bare(orig_from);
local target_session = origin;
local top_priority = false;
local user_sessions = bare_sessions[bare_jid];
-- Stanza about to be delivered to a local client
if not c2s then
bare_jid = jid_bare(orig_to);
target_session = full_sessions[orig_to];
user_sessions = bare_sessions[bare_jid];
if not target_session and user_sessions then
-- The top resources will already receive this message per normal routing rules,
-- so we are going to skip them in order to avoid sending duplicated messages.
local top_resources = user_sessions.top_resources;
top_priority = top_resources and top_resources[1].priority
end
end
if not user_sessions then
module:log("debug", "Skip carbons for offline user");
return -- No use in sending carbons to an offline user
end
if stanza:get_child("private", xmlns_carbons) then
if not c2s then
stanza:maptags(function(tag)
if not ( tag.attr.xmlns == xmlns_carbons and tag.name == "private" ) then
return tag;
end
end);
end
module:log("debug", "Message tagged private, ignoring");
return
elseif stanza:get_child("no-copy", "urn:xmpp:hints") then
module:log("debug", "Message has no-copy hint, ignoring");
return
elseif not c2s and bare_jid == orig_from and stanza:get_child("x", "http://jabber.org/protocol/muc#user") then
module:log("debug", "MUC PM, ignoring");
return
end
-- Create the carbon copy and wrap it as per the Stanza Forwarding XEP
local copy = st.clone(stanza);
copy.attr.xmlns = "jabber:client";
local carbon = st.message{ from = bare_jid, type = orig_type, }
:tag(c2s and "sent" or "received", { xmlns = xmlns_carbons })
:tag("forwarded", { xmlns = xmlns_forward })
:add_child(copy):reset();
user_sessions = user_sessions and user_sessions.sessions;
for _, session in pairs(user_sessions) do
-- Carbons are sent to resources that have enabled it
if session.want_carbons
-- but not the resource that sent the message, or the one that it's directed to
and session ~= target_session
-- and isn't among the top resources that would receive the message per standard routing rules
and (c2s or session.priority ~= top_priority) then
carbon.attr.to = session.full_jid;
module:log("debug", "Sending carbon to %s", session.full_jid);
session.send(carbon);
end
end
end
local function c2s_message_handler(event)
return message_handler(event, true)
end
-- Stanzas sent by local clients
module:hook("pre-message/host", c2s_message_handler, 1);
module:hook("pre-message/bare", c2s_message_handler, 1);
module:hook("pre-message/full", c2s_message_handler, 1);
-- Stanzas to local clients
module:hook("message/bare", message_handler, 1);
module:hook("message/full", message_handler, 1);
module:add_feature(xmlns_carbons);
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