diff options
Diffstat (limited to 'plugins/muc/history.lib.lua')
| -rw-r--r-- | plugins/muc/history.lib.lua | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/plugins/muc/history.lib.lua b/plugins/muc/history.lib.lua new file mode 100644 index 00000000..6fdef96f --- /dev/null +++ b/plugins/muc/history.lib.lua @@ -0,0 +1,170 @@ +-- 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); + +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._data["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); + +local function send_history(room, stanza) + local maxchars, maxstanzas, since = parse_history(stanza); + local event = { + room = room; + 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._data["history"]; + if not history then history = {}; room._data["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; +}; |