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local filters = require "prosody.util.filters";
local jid = require "prosody.util.jid";
local set = require "prosody.util.set";
local client_watchers = {};
-- active_filters[session] = {
-- filter_func = filter_func;
-- downstream = { cb1, cb2, ... };
-- }
local active_filters = {};
local function subscribe_session_stanzas(session, handler, reason)
if active_filters[session] then
table.insert(active_filters[session].downstream, handler);
if reason then
handler(reason, nil, session);
end
return;
end
local downstream = { handler };
active_filters[session] = {
filter_in = function (stanza)
module:log("debug", "NOTIFY WATCHER %d", #downstream);
for i = 1, #downstream do
downstream[i]("received", stanza, session);
end
return stanza;
end;
filter_out = function (stanza)
module:log("debug", "NOTIFY WATCHER %d", #downstream);
for i = 1, #downstream do
downstream[i]("sent", stanza, session);
end
return stanza;
end;
downstream = downstream;
};
filters.add_filter(session, "stanzas/in", active_filters[session].filter_in);
filters.add_filter(session, "stanzas/out", active_filters[session].filter_out);
if reason then
handler(reason, nil, session);
end
end
local function unsubscribe_session_stanzas(session, handler, reason)
local active_filter = active_filters[session];
if not active_filter then
return;
end
for i = #active_filter.downstream, 1, -1 do
if active_filter.downstream[i] == handler then
table.remove(active_filter.downstream, i);
if reason then
handler(reason, nil, session);
end
end
end
if #active_filter.downstream == 0 then
filters.remove_filter(session, "stanzas/in", active_filter.filter_in);
filters.remove_filter(session, "stanzas/out", active_filter.filter_out);
end
active_filters[session] = nil;
end
local function unsubscribe_all_from_session(session, reason)
local active_filter = active_filters[session];
if not active_filter then
return;
end
for i = #active_filter.downstream, 1, -1 do
local handler = table.remove(active_filter.downstream, i);
if reason then
handler(reason, nil, session);
end
end
filters.remove_filter(session, "stanzas/in", active_filter.filter_in);
filters.remove_filter(session, "stanzas/out", active_filter.filter_out);
active_filters[session] = nil;
end
local function unsubscribe_handler_from_all(handler, reason)
for session in pairs(active_filters) do
unsubscribe_session_stanzas(session, handler, reason);
end
end
local s2s_watchers = {};
module:hook("s2sin-established", function (event)
for _, watcher in ipairs(s2s_watchers) do
if watcher.target_spec == event.session.from_host then
subscribe_session_stanzas(event.session, watcher.handler, "opened");
end
end
end);
module:hook("s2sout-established", function (event)
for _, watcher in ipairs(s2s_watchers) do
if watcher.target_spec == event.session.to_host then
subscribe_session_stanzas(event.session, watcher.handler, "opened");
end
end
end);
module:hook("s2s-closed", function (event)
unsubscribe_all_from_session(event.session, "closed");
end);
local watched_hosts = set.new();
local handler_map = setmetatable({}, { __mode = "kv" });
local function add_stanza_watcher(spec, orig_handler)
local function filtering_handler(event_type, stanza, session)
if stanza and spec.filter_spec then
if spec.filter_spec.with_jid then
if event_type == "sent" and (not stanza.attr.from or not jid.compare(stanza.attr.from, spec.filter_spec.with_jid)) then
return;
elseif event_type == "received" and (not stanza.attr.to or not jid.compare(stanza.attr.to, spec.filter_spec.with_jid)) then
return;
end
end
end
return orig_handler(event_type, stanza, session);
end
handler_map[orig_handler] = filtering_handler;
if spec.target_spec.jid then
local target_is_remote_host = not jid.node(spec.target_spec.jid) and not prosody.hosts[spec.target_spec.jid];
if target_is_remote_host then
-- Watch s2s sessions
table.insert(s2s_watchers, {
target_spec = spec.target_spec.jid;
handler = filtering_handler;
orig_handler = orig_handler;
});
-- Scan existing s2sin for matches
for session in pairs(prosody.incoming_s2s) do
if spec.target_spec.jid == session.from_host then
subscribe_session_stanzas(session, filtering_handler, "attached");
end
end
-- Scan existing s2sout for matches
for local_host, local_session in pairs(prosody.hosts) do --luacheck: ignore 213/local_host
for remote_host, remote_session in pairs(local_session.s2sout) do
if spec.target_spec.jid == remote_host then
subscribe_session_stanzas(remote_session, filtering_handler, "attached");
end
end
end
else
table.insert(client_watchers, {
target_spec = spec.target_spec.jid;
handler = filtering_handler;
orig_handler = orig_handler;
});
local host = jid.host(spec.target_spec.jid);
if not watched_hosts:contains(host) and prosody.hosts[host] then
module:context(host):hook("resource-bind", function (event)
for _, watcher in ipairs(client_watchers) do
module:log("debug", "NEW CLIENT: %s vs %s", event.session.full_jid, watcher.target_spec);
if jid.compare(event.session.full_jid, watcher.target_spec) then
module:log("debug", "MATCH");
subscribe_session_stanzas(event.session, watcher.handler, "opened");
else
module:log("debug", "NO MATCH");
end
end
end);
module:context(host):hook("resource-unbind", function (event)
unsubscribe_all_from_session(event.session, "closed");
end);
watched_hosts:add(host);
end
for full_jid, session in pairs(prosody.full_sessions) do
if jid.compare(full_jid, spec.target_spec.jid) then
subscribe_session_stanzas(session, filtering_handler, "attached");
end
end
end
else
error("No recognized target selector");
end
end
local function remove_stanza_watcher(orig_handler)
local handler = handler_map[orig_handler];
unsubscribe_handler_from_all(handler, "detached");
handler_map[orig_handler] = nil;
for i = #client_watchers, 1, -1 do
if client_watchers[i].orig_handler == orig_handler then
table.remove(client_watchers, i);
end
end
for i = #s2s_watchers, 1, -1 do
if s2s_watchers[i].orig_handler == orig_handler then
table.remove(s2s_watchers, i);
end
end
end
local function cleanup(reason)
client_watchers = {};
s2s_watchers = {};
for session in pairs(active_filters) do
unsubscribe_all_from_session(session, reason or "cancelled");
end
end
return {
add = add_stanza_watcher;
remove = remove_stanza_watcher;
cleanup = cleanup;
};
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