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-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
-- Copyright (C) 2014 Daurnimator
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local gettime = os.time;
local datetime = require "util.datetime";
local st = require "util.stanza";
local default_history_length = 20;
local max_history_length = module:get_option_number("max_history_messages", math.huge);
local function set_max_history_length(_max_history_length)
max_history_length = _max_history_length or math.huge;
end
local function get_historylength(room)
return math.min(room._data.history_length or default_history_length, max_history_length);
end
local function set_historylength(room, length)
if length then
length = assert(tonumber(length), "Length not a valid number");
end
if length == default_history_length then length = nil; end
room._data.history_length = length;
return true;
end
module:hook("muc-config-form", function(event)
table.insert(event.form, {
name = "muc#roomconfig_historylength";
type = "text-single";
label = "Maximum Number of History Messages Returned by Room";
value = tostring(get_historylength(event.room));
});
end, 100-10);
module:hook("muc-config-submitted/muc#roomconfig_historylength", function(event)
if set_historylength(event.room, event.value) then
event.status_codes["104"] = true;
end
end);
local function parse_history(stanza)
local x_tag = stanza:get_child("x", "http://jabber.org/protocol/muc");
local history_tag = x_tag and x_tag:get_child("history", "http://jabber.org/protocol/muc");
if not history_tag then
return nil, default_history_length, nil;
end
local maxchars = tonumber(history_tag.attr.maxchars);
local maxstanzas = tonumber(history_tag.attr.maxstanzas);
-- messages received since the UTC datetime specified
local since = history_tag.attr.since;
if since then
since = datetime.parse(since);
end
-- messages received in the last "X" seconds.
local seconds = tonumber(history_tag.attr.seconds);
if seconds then
seconds = gettime() - seconds;
if since then
since = math.max(since, seconds);
else
since = seconds;
end
end
return maxchars, maxstanzas, since;
end
module:hook("muc-get-history", function(event)
local room = event.room;
local history = room._history; -- send discussion history
if not history then return nil end
local history_len = #history;
local to = event.to;
local maxchars = event.maxchars;
local maxstanzas = event.maxstanzas or history_len;
local since = event.since;
local n = 0;
local charcount = 0;
for i=history_len,1,-1 do
local entry = history[i];
if maxchars then
if not entry.chars then
entry.stanza.attr.to = "";
entry.chars = #tostring(entry.stanza);
end
charcount = charcount + entry.chars + #to;
if charcount > maxchars then break; end
end
if since and since > entry.timestamp then break; end
if n + 1 > maxstanzas then break; end
n = n + 1;
end
local i = history_len-n+1
function event.next_stanza()
if i > history_len then return nil end
local entry = history[i];
local msg = entry.stanza;
msg.attr.to = to;
i = i + 1;
return msg;
end
return true;
end, -1);
local function send_history(room, stanza)
local maxchars, maxstanzas, since = parse_history(stanza);
local event = {
room = room;
stanza = stanza;
to = stanza.attr.from; -- `to` is required to calculate the character count for `maxchars`
maxchars = maxchars, maxstanzas = maxstanzas, since = since;
next_stanza = function() end; -- events should define this iterator
};
module:fire_event("muc-get-history", event);
for msg in event.next_stanza, event do
room:route_stanza(msg);
end
end
-- Send history on join
module:hook("muc-occupant-session-new", function(event)
send_history(event.room, event.stanza);
end, 50); -- Before subject(20)
-- add to history
module:hook("muc-add-history", function(event)
local historic = event.stanza:get_child("body");
if historic then
local room = event.room
local history = room._history;
if not history then history = {}; room._history = history; end
local stanza = st.clone(event.stanza);
stanza.attr.to = "";
local ts = gettime();
local stamp = datetime.datetime(ts);
stanza:tag("delay", {xmlns = "urn:xmpp:delay", from = module.host, stamp = stamp}):up(); -- XEP-0203
stanza:tag("x", {xmlns = "jabber:x:delay", from = module.host, stamp = datetime.legacy()}):up(); -- XEP-0091 (deprecated)
local entry = { stanza = stanza, timestamp = ts };
table.insert(history, entry);
while #history > get_historylength(room) do table.remove(history, 1) end
end
return true;
end, -1);
-- Have a single muc-add-history event, so that plugins can mark it
-- as handled without stopping other muc-broadcast-message handlers
module:hook("muc-broadcast-message", function(event)
module:fire_event("muc-add-history", event);
end);
return {
set_max_length = set_max_history_length;
parse_history = parse_history;
send = send_history;
get_length = get_historylength;
set_length = set_historylength;
};
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