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prosody/plugins/mod_presence.lua

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-- Prosody IM
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local log = module._log;
local require = require;
local pairs, ipairs = pairs, ipairs;
local t_concat, t_insert = table.concat, table.insert;
local s_find = string.find;
local tonumber = tonumber;
local st = require "util.stanza";
local jid_split = require "util.jid".split;
local jid_bare = require "util.jid".bare;
local hosts = hosts;
local rostermanager = require "core.rostermanager";
local sessionmanager = require "core.sessionmanager";
local offlinemanager = require "core.offlinemanager";
local _core_route_stanza = core_route_stanza;
local core_route_stanza;
function core_route_stanza(origin, stanza)
if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" and stanza.attr.type ~= "error" then
local node, host = jid_split(stanza.attr.to);
host = hosts[host];
if node and host and host.type == "local" then
handle_inbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to), core_route_stanza);
return;
end
end
_core_route_stanza(origin, stanza);
end
local function select_top_resources(user)
local priority = 0;
local recipients = {};
for _, session in pairs(user.sessions) do -- find resource with greatest priority
if session.presence then
-- TODO check active privacy list for session
local p = session.priority;
if p > priority then
priority = p;
recipients = {session};
elseif p == priority then
t_insert(recipients, session);
end
end
end
return recipients;
end
local function recalc_resource_map(origin)
local user = hosts[origin.host].sessions[origin.username];
user.top_resources = select_top_resources(user);
if #user.top_resources == 0 then user.top_resources = nil; end
end
function handle_normal_presence(origin, stanza, core_route_stanza)
local roster = origin.roster;
local node, host = origin.username, origin.host;
for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources
if res ~= origin and res.presence then -- to resource
stanza.attr.to = res.full_jid;
core_route_stanza(origin, stanza);
end
end
for jid, item in pairs(roster) do -- broadcast to all interested contacts
if item.subscription == "both" or item.subscription == "from" then
stanza.attr.to = jid;
core_route_stanza(origin, stanza);
end
end
if stanza.attr.type == nil and not origin.presence then -- initial presence
origin.presence = stanza; -- FIXME repeated later
local probe = st.presence({from = origin.full_jid, type = "probe"});
for jid, item in pairs(roster) do -- probe all contacts we are subscribed to
if item.subscription == "both" or item.subscription == "to" then
probe.attr.to = jid;
core_route_stanza(origin, probe);
end
end
for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast from all available resources
if res ~= origin and res.presence then
res.presence.attr.to = origin.full_jid;
core_route_stanza(res, res.presence);
res.presence.attr.to = nil;
end
end
if roster.pending then -- resend incoming subscription requests
for jid in pairs(roster.pending) do
origin.send(st.presence({type="subscribe", from=jid})); -- TODO add to attribute? Use original?
end
end
local request = st.presence({type="subscribe", from=origin.username.."@"..origin.host});
for jid, item in pairs(roster) do -- resend outgoing subscription requests
if item.ask then
request.attr.to = jid;
core_route_stanza(origin, request);
end
end
local offline = offlinemanager.load(node, host);
if offline then
for _, msg in ipairs(offline) do
origin.send(msg); -- FIXME do we need to modify to/from in any way?
end
offlinemanager.deleteAll(node, host);
end
end
if stanza.attr.type == "unavailable" then
origin.presence = nil;
if origin.priority then
origin.priority = nil;
recalc_resource_map(origin);
end
if origin.directed then
for jid in pairs(origin.directed) do
stanza.attr.to = jid;
core_route_stanza(origin, stanza);
end
origin.directed = nil;
end
else
origin.presence = stanza;
local priority = stanza:child_with_name("priority");
if priority and #priority > 0 then
priority = t_concat(priority);
if s_find(priority, "^[+-]?[0-9]+$") then
priority = tonumber(priority);
if priority < -128 then priority = -128 end
if priority > 127 then priority = 127 end
else priority = 0; end
else priority = 0; end
if origin.priority ~= priority then
origin.priority = priority;
recalc_resource_map(origin);
end
end
stanza.attr.to = nil; -- reset it
end
function send_presence_of_available_resources(user, host, jid, recipient_session, core_route_stanza, stanza)
local h = hosts[host];
local count = 0;
if h and h.type == "local" then
local u = h.sessions[user];
if u then
for k, session in pairs(u.sessions) do
local pres = session.presence;
if pres then
if stanza then pres = stanza; pres.attr.from = session.full_jid; end
pres.attr.to = jid;
core_route_stanza(session, pres);
pres.attr.to = nil;
count = count + 1;
end
end
end
end
log("debug", "broadcasted presence of "..count.." resources from "..user.."@"..host.." to "..jid);
return count;
end
function handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza)
local node, host = jid_split(from_bare);
if to_bare == origin.username.."@"..origin.host then return; end -- No self contacts
local st_from, st_to = stanza.attr.from, stanza.attr.to;
stanza.attr.from, stanza.attr.to = from_bare, to_bare;
log("debug", "outbound presence "..stanza.attr.type.." from "..from_bare.." for "..to_bare);
if stanza.attr.type == "subscribe" then
-- 1. route stanza
-- 2. roster push (subscription = none, ask = subscribe)
if rostermanager.set_contact_pending_out(node, host, to_bare) then
rostermanager.roster_push(node, host, to_bare);
end -- else file error
core_route_stanza(origin, stanza);
elseif stanza.attr.type == "unsubscribe" then
-- 1. route stanza
-- 2. roster push (subscription = none or from)
if rostermanager.unsubscribe(node, host, to_bare) then
rostermanager.roster_push(node, host, to_bare); -- FIXME do roster push when roster has in fact not changed?
end -- else file error
core_route_stanza(origin, stanza);
elseif stanza.attr.type == "subscribed" then
-- 1. route stanza
-- 2. roster_push ()
-- 3. send_presence_of_available_resources
if rostermanager.subscribed(node, host, to_bare) then
rostermanager.roster_push(node, host, to_bare);
end
core_route_stanza(origin, stanza);
send_presence_of_available_resources(node, host, to_bare, origin, core_route_stanza);
elseif stanza.attr.type == "unsubscribed" then
-- 1. route stanza
-- 2. roster push (subscription = none or to)
if rostermanager.unsubscribed(node, host, to_bare) then
rostermanager.roster_push(node, host, to_bare);
end
core_route_stanza(origin, stanza);
end
stanza.attr.from, stanza.attr.to = st_from, st_to;
end
function handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza)
local node, host = jid_split(to_bare);
local st_from, st_to = stanza.attr.from, stanza.attr.to;
stanza.attr.from, stanza.attr.to = from_bare, to_bare;
log("debug", "inbound presence "..stanza.attr.type.." from "..from_bare.." for "..to_bare);
if not node then
log("debug", "dropping presence sent to host or invalid address '%s'", tostring(to_bare));
end
if stanza.attr.type == "probe" then
if rostermanager.is_contact_subscribed(node, host, from_bare) then
if 0 == send_presence_of_available_resources(node, host, st_from, origin, core_route_stanza) then
core_route_stanza(hosts[host], st.presence({from=to_bare, to=from_bare, type="unavailable"})); -- TODO send last activity
end
else
core_route_stanza(hosts[host], st.presence({from=to_bare, to=from_bare, type="unsubscribed"}));
end
elseif stanza.attr.type == "subscribe" then
if rostermanager.is_contact_subscribed(node, host, from_bare) then
core_route_stanza(hosts[host], st.presence({from=to_bare, to=from_bare, type="subscribed"})); -- already subscribed
-- Sending presence is not clearly stated in the RFC, but it seems appropriate
if 0 == send_presence_of_available_resources(node, host, from_bare, origin, core_route_stanza) then
core_route_stanza(hosts[host], st.presence({from=to_bare, to=from_bare, type="unavailable"})); -- TODO send last activity
end
else
core_route_stanza(hosts[host], st.presence({from=to_bare, to=from_bare, type="unavailable"})); -- acknowledging receipt
if not rostermanager.is_contact_pending_in(node, host, from_bare) then
if rostermanager.set_contact_pending_in(node, host, from_bare) then
sessionmanager.send_to_available_resources(node, host, stanza);
end -- TODO else return error, unable to save
end
end
elseif stanza.attr.type == "unsubscribe" then
if rostermanager.process_inbound_unsubscribe(node, host, from_bare) then
sessionmanager.send_to_interested_resources(node, host, stanza);
rostermanager.roster_push(node, host, from_bare);
end
elseif stanza.attr.type == "subscribed" then
if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then
sessionmanager.send_to_interested_resources(node, host, stanza);
rostermanager.roster_push(node, host, from_bare);
end
elseif stanza.attr.type == "unsubscribed" then
if rostermanager.process_inbound_subscription_cancellation(node, host, from_bare) then
sessionmanager.send_to_interested_resources(node, host, stanza);
rostermanager.roster_push(node, host, from_bare);
end
end -- discard any other type
stanza.attr.from, stanza.attr.to = st_from, st_to;
end
local outbound_presence_handler = function(data)
-- outbound presence recieved
local origin, stanza = data.origin, data.stanza;
local to = stanza.attr.to;
if to then
local t = stanza.attr.type;
if t ~= nil and t ~= "unavailable" and t ~= "error" then -- check for subscriptions and probes
handle_outbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to), core_route_stanza);
return true;
end
local to_bare = jid_bare(to);
if not(origin.roster[to_bare] and (origin.roster[to_bare].subscription == "both" or origin.roster[to_bare].subscription == "from")) then -- directed presence
origin.directed = origin.directed or {};
if t then -- removing from directed presence list on sending an error or unavailable
origin.directed[to] = nil; -- FIXME does it make more sense to add to_bare rather than to?
else
origin.directed[to] = true; -- FIXME does it make more sense to add to_bare rather than to?
end
end
end -- TODO maybe handle normal presence here, instead of letting it pass to incoming handlers?
end
module:hook("pre-presence/full", outbound_presence_handler);
module:hook("pre-presence/bare", outbound_presence_handler);
module:hook("pre-presence/host", outbound_presence_handler);
module:hook("presence/bare", function(data)
-- inbound presence to bare JID recieved
local origin, stanza = data.origin, data.stanza;
local to = stanza.attr.to;
local t = stanza.attr.type;
if to then
if t ~= nil and t ~= "unavailable" and t ~= "error" then -- check for subscriptions and probes sent to bare JID
handle_inbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to), core_route_stanza);
return true;
end
local user = bare_sessions[to];
if user then
for _, session in pairs(user.sessions) do
if session.presence then -- only send to available resources
session.send(stanza);
end
end
end -- no resources not online, discard
elseif not t or t == "unavailable" then
handle_normal_presence(origin, stanza, core_route_stanza);
end
return true;
end);
module:hook("presence/full", function(data)
-- inbound presence to full JID recieved
local origin, stanza = data.origin, data.stanza;
local t = stanza.attr.type;
if t ~= nil and t ~= "unavailable" and t ~= "error" then -- check for subscriptions and probes sent to full JID
handle_inbound_presence_subscriptions_and_probes(origin, stanza, jid_bare(stanza.attr.from), jid_bare(stanza.attr.to), core_route_stanza);
return true;
end
local session = full_sessions[stanza.attr.to];
if session then
-- TODO fire post processing event
session.send(stanza);
end -- resource not online, discard
return true;
end);
module:hook("presence/host", function(data)
-- inbound presence to the host
local origin, stanza = data.origin, data.stanza;
local from_bare = jid_bare(stanza.attr.from);
local t = stanza.attr.type;
if t == "probe" then
core_route_stanza(hosts[module.host], st.presence({ from = module.host, to = from_bare, id = stanza.attr.id }));
elseif t == "subscribe" then
core_route_stanza(hosts[module.host], st.presence({ from = module.host, to = from_bare, id = stanza.attr.id, type = "subscribed" }));
core_route_stanza(hosts[module.host], st.presence({ from = module.host, to = from_bare, id = stanza.attr.id }));
end
return true;
end);
module:hook("resource-unbind", function(event)
local session, err = event.session, event.error;
-- Send unavailable presence
if session.presence then
local pres = st.presence{ type = "unavailable" };
if not(err) or err == "closed" then err = "connection closed"; end
pres:tag("status"):text("Disconnected: "..err):up();
session:dispatch_stanza(pres);
elseif session.directed then
local pres = st.presence{ type = "unavailable", from = session.full_jid };
if not(err) or err == "closed" then err = "connection closed"; end
pres:tag("status"):text("Disconnected: "..err):up();
for jid in pairs(session.directed) do
pres.attr.to = jid;
core_route_stanza(session, pres);
end
session.directed = nil;
end
end);
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