aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/mod_csi_simple.lua
blob: 07a8cfb3cafa4ad331f746c9174898fde18f8053 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
-- Copyright (C) 2016-2018 Kim Alvefur
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--

module:depends"csi"

local jid = require "util.jid";
local st = require "util.stanza";
local dt = require "util.datetime";
local new_queue = require "util.queue".new;
local filters = require "util.filters";

local function new_pump(output, ...)
	-- luacheck: ignore 212/self
	local q = new_queue(...);
	local flush = true;
	function q:pause()
		flush = false;
	end
	function q:resume()
		flush = true;
		return q:flush();
	end
	local push = q.push;
	function q:push(item)
		local ok = push(self, item);
		if not ok then
			q:flush();
			output(item, self);
		elseif flush then
			return q:flush();
		end
		return true;
	end
	function q:flush()
		local item = self:pop();
		while item do
			output(item, self);
			item = self:pop();
		end
		return true;
	end
	return q;
end

local queue_size = module:get_option_number("csi_queue_size", 256);

module:hook("csi-is-stanza-important", function (event)
	local stanza = event.stanza;
	if not st.is_stanza(stanza) then
		return true;
	end
	local st_name = stanza.name;
	if not st_name then return false; end
	local st_type = stanza.attr.type;
	if st_name == "presence" then
		if st_type == nil or st_type == "unavailable" then
			return false;
		end
		return true;
	elseif st_name == "message" then
		if st_type == "headline" then
			return false;
		end
		if stanza:get_child("sent", "urn:xmpp:carbons:2") then
			return true;
		end
		local forwarded = stanza:find("{urn:xmpp:carbons:2}received/{urn:xmpp:forward:0}/{jabber:client}message");
		if forwarded then
			stanza = forwarded;
		end
		if stanza:get_child("body") then
			return true;
		end
		if stanza:get_child("subject") then
			return true;
		end
		if stanza:get_child("encryption", "urn:xmpp:eme:0") then
			return true;
		end
		return false;
	end
	return true;
end, -1);

local function with_timestamp(stanza, from)
	if st.is_stanza(stanza) and stanza.attr.xmlns == nil and stanza.name ~= "iq" then
		stanza = st.clone(stanza);
		stanza:add_direct_child(st.stanza("delay", {xmlns = "urn:xmpp:delay", from = from, stamp = dt.datetime()}));
	end
	return stanza;
end

local function manage_buffer(stanza, session)
	local ctr = session.csi_counter or 0;
	if ctr >= queue_size or module:fire_event("csi-is-stanza-important", { stanza = stanza, session = session }) then
		session.conn:resume_writes();
	else
		stanza = with_timestamp(stanza, jid.join(session.username, session.host))
	end
	session.csi_counter = ctr + 1;
	return stanza;
end

local function flush_buffer(data, session)
	session.conn:resume_writes();
	return data;
end

module:hook("csi-client-inactive", function (event)
	local session = event.origin;
	if session.conn and session.conn and session.conn.pause_writes then
		session.conn:pause_writes();
		filters.add_filter(session, "stanzas/out", manage_buffer);
		filters.add_filter(session, "bytes/in", flush_buffer);
	elseif session.pump then
		session.pump:pause();
	else
		local bare_jid = jid.join(session.username, session.host);
		local send = session.send;
		session._orig_send = send;
		local pump = new_pump(session.send, queue_size);
		pump:pause();
		session.pump = pump;
		function session.send(stanza)
			if session.state == "active" or module:fire_event("csi-is-stanza-important", { stanza = stanza, session = session }) then
				pump:flush();
				send(stanza);
			else
				pump:push(with_timestamp(stanza, bare_jid));
			end
			return true;
		end
	end
end);

module:hook("csi-client-active", function (event)
	local session = event.origin;
	if session.pump then
		session.pump:resume();
	elseif session.conn and session.conn and session.conn.resume_writes then
		filters.remove_filter(session, "stanzas/out", manage_buffer);
		filters.remove_filter(session, "bytes/in", flush_buffer);
		session.conn:resume_writes();
	end
end);


module:hook("c2s-ondrain", function (event)
	local session = event.session;
	if session.state == "inactive" and session.conn and session.conn and session.conn.pause_writes then
		session.csi_counter = 0;
		session.conn:pause_writes();
	end
end);