diff options
Diffstat (limited to 'plugins/mod_muc_mam.lua')
| -rw-r--r-- | plugins/mod_muc_mam.lua | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/plugins/mod_muc_mam.lua b/plugins/mod_muc_mam.lua new file mode 100644 index 00000000..3fdaeaa4 --- /dev/null +++ b/plugins/mod_muc_mam.lua @@ -0,0 +1,384 @@ +-- XEP-0313: Message Archive Management for Prosody MUC +-- Copyright (C) 2011-2017 Kim Alvefur +-- +-- This file is MIT/X11 licensed. + +if module:get_host_type() ~= "component" then + module:log("error", "mod_%s should be loaded only on a MUC component, not normal hosts", module.name); + return; +end + +local xmlns_mam = "urn:xmpp:mam:2"; +local xmlns_delay = "urn:xmpp:delay"; +local xmlns_forward = "urn:xmpp:forward:0"; +local xmlns_st_id = "urn:xmpp:sid:0"; +local xmlns_muc_user = "http://jabber.org/protocol/muc#user"; +local muc_form_enable = "muc#roomconfig_enablearchiving" + +local st = require "util.stanza"; +local rsm = require "util.rsm"; +local jid_bare = require "util.jid".bare; +local jid_split = require "util.jid".split; +local jid_prep = require "util.jid".prep; +local dataform = require "util.dataforms".new; + +local mod_muc = module:depends"muc"; +local get_room_from_jid = mod_muc.get_room_from_jid; + +local is_stanza = st.is_stanza; +local tostring = tostring; +local time_now = os.time; +local m_min = math.min; +local timestamp, timestamp_parse = require "util.datetime".datetime, require "util.datetime".parse; +local default_max_items, max_max_items = 20, module:get_option_number("max_archive_query_results", 50); + +local default_history_length = 20; +local max_history_length = module:get_option_number("max_history_messages", math.huge); + +local function get_historylength(room) + return math.min(room._data.history_length or default_history_length, max_history_length); +end + +local log_all_rooms = module:get_option_boolean("muc_log_all_rooms", false); +local log_by_default = module:get_option_boolean("muc_log_by_default", true); + +local archive_store = "muc_log"; +local archive = module:open_store(archive_store, "archive"); + +if archive.name == "null" or not archive.find then + if not archive.find then + module:log("error", "Attempt to open archive storage returned a driver without archive API support"); + module:log("error", "mod_%s does not support archiving", + archive._provided_by or archive.name and "storage_"..archive.name.."(?)" or "<unknown>"); + else + module:log("error", "Attempt to open archive storage returned null driver"); + end + module:log("info", "See https://prosody.im/doc/storage and https://prosody.im/doc/archiving for more information"); + return false; +end + +local function archiving_enabled(room) + if log_all_rooms then + return true; + end + local enabled = room._data.archiving; + if enabled == nil then + return log_by_default; + end + return enabled; +end + +if not log_all_rooms then + module:hook("muc-config-form", function(event) + local room, form = event.room, event.form; + table.insert(form, + { + name = muc_form_enable, + type = "boolean", + label = "Enable archiving?", + value = archiving_enabled(room), + } + ); + end); + + module:hook("muc-config-submitted/"..muc_form_enable, function(event) + event.room._data.archiving = event.value; + end); +end + +-- Note: We ignore the 'with' field as this is internally used for stanza types +local query_form = dataform { + { name = "FORM_TYPE"; type = "hidden"; value = xmlns_mam; }; + { name = "with"; type = "jid-single"; }; + { name = "start"; type = "text-single" }; + { name = "end"; type = "text-single"; }; +}; + +-- Serve form +module:hook("iq-get/bare/"..xmlns_mam..":query", function(event) + local origin, stanza = event.origin, event.stanza; + origin.send(st.reply(stanza):add_child(query_form:form())); + return true; +end); + +-- Handle archive queries +module:hook("iq-set/bare/"..xmlns_mam..":query", function(event) + local origin, stanza = event.origin, event.stanza; + local room_jid = stanza.attr.to; + local room_node = jid_split(room_jid); + local orig_from = stanza.attr.from; + local query = stanza.tags[1]; + + local room = get_room_from_jid(room_jid); + if not room then + origin.send(st.error_reply(stanza, "cancel", "item-not-found")) + return true; + end + local from = jid_bare(orig_from); + + -- Banned or not a member of a members-only room? + local from_affiliation = room:get_affiliation(from); + if from_affiliation == "outcast" -- banned + or room:get_members_only() and not from_affiliation then -- members-only, not a member + origin.send(st.error_reply(stanza, "auth", "forbidden")) + return true; + end + + local qid = query.attr.queryid; + + -- Search query parameters + local qstart, qend; + local form = query:get_child("x", "jabber:x:data"); + if form then + local err; + form, err = query_form:data(form); + if err then + origin.send(st.error_reply(stanza, "modify", "bad-request", select(2, next(err)))); + return true; + end + qstart, qend = form["start"], form["end"]; + end + + if qstart or qend then -- Validate timestamps + local vstart, vend = (qstart and timestamp_parse(qstart)), (qend and timestamp_parse(qend)) + if (qstart and not vstart) or (qend and not vend) then + origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid timestamp")) + return true; + end + qstart, qend = vstart, vend; + end + + module:log("debug", "Archive query id %s from %s until %s)", + tostring(qid), + qstart and timestamp(qstart) or "the dawn of time", + qend and timestamp(qend) or "now"); + + -- RSM stuff + local qset = rsm.get(query); + local qmax = m_min(qset and qset.max or default_max_items, max_max_items); + local reverse = qset and qset.before or false; + + local before, after = qset and qset.before, qset and qset.after; + if type(before) ~= "string" then before = nil; end + + -- Load all the data! + local data, err = archive:find(room_node, { + start = qstart; ["end"] = qend; -- Time range + limit = qmax + 1; + before = before; after = after; + reverse = reverse; + with = "message<groupchat"; + }); + + if not data then + origin.send(st.error_reply(stanza, "cancel", "internal-server-error")); + return true; + end + local total = tonumber(err); + + local msg_reply_attr = { to = stanza.attr.from, from = stanza.attr.to }; + + local results = {}; + + -- Wrap it in stuff and deliver + local first, last; + local count = 0; + local complete = "true"; + for id, item, when in data do + count = count + 1; + if count > qmax then + complete = nil; + break; + end + local fwd_st = st.message(msg_reply_attr) + :tag("result", { xmlns = xmlns_mam, queryid = qid, id = id }) + :tag("forwarded", { xmlns = xmlns_forward }) + :tag("delay", { xmlns = xmlns_delay, stamp = timestamp(when) }):up(); + + -- Strip <x> tag, containing the original senders JID, unless the room makes this public + if room:get_whois() ~= "anyone" then + item:maptags(function (tag) + if tag.name == "x" and tag.attr.xmlns == xmlns_muc_user then + return nil; + end + return tag; + end); + end + if not is_stanza(item) then + item = st.deserialize(item); + end + item.attr.xmlns = "jabber:client"; + fwd_st:add_child(item); + + if not first then first = id; end + last = id; + + if reverse then + results[count] = fwd_st; + else + origin.send(fwd_st); + end + end + + if reverse then + for i = #results, 1, -1 do + origin.send(results[i]); + end + first, last = last, first; + end + + -- That's all folks! + module:log("debug", "Archive query %s completed", tostring(qid)); + + origin.send(st.reply(stanza) + :tag("fin", { xmlns = xmlns_mam, queryid = qid, complete = complete }) + :add_child(rsm.generate { + first = first, last = last, count = total })); + return true; +end); + +module:hook("muc-get-history", function (event) + local room = event.room; + if not archiving_enabled(room) then return end + local room_jid = room.jid; + local maxstanzas = event.maxstanzas; + local maxchars = event.maxchars; + local since = event.since; + local to = event.to; + + if maxstanzas == 0 or maxchars == 0 then + return -- No history requested + end + + if not maxstanzas or maxstanzas > get_historylength(room) then + maxstanzas = get_historylength(room); + end + + if room._history and #room._history >= maxstanzas then + return -- It can deal with this itself + end + + -- Load all the data! + local query = { + limit = maxstanzas; + start = since; + reverse = true; + with = "message<groupchat"; + } + local data, err = archive:find(jid_split(room_jid), query); + + if not data then + module:log("error", "Could not fetch history: %s", tostring(err)); + return + end + + local history, i = {}, 1; + + for id, item, when in data do + item.attr.to = to; + item:tag("delay", { xmlns = "urn:xmpp:delay", from = room_jid, stamp = timestamp(when) }):up(); -- XEP-0203 + item:tag("stanza-id", { xmlns = xmlns_st_id, by = room_jid, id = id }):up(); + if room:get_whois() ~= "anyone" then + item:maptags(function (tag) + if tag.name == "x" and tag.attr.xmlns == xmlns_muc_user then + return nil; + end + return tag; + end); + end + if maxchars then + local chars = #tostring(item); + if maxchars - chars < 0 then + break + end + maxchars = maxchars - chars; + end + history[i], i = item, i+1; + -- module:log("debug", tostring(item)); + end + function event.next_stanza() + i = i - 1; + return history[i]; + end + return true; +end, 1); + +module:hook("muc-broadcast-messages", function (event) + local room, stanza = event.room, event.stanza; + + -- Filter out <stanza-id> that claim to be from us + stanza:maptags(function (tag) + if tag.name == "stanza-id" and tag.attr.xmlns == xmlns_st_id + and jid_prep(tag.attr.by) == room.jid then + return nil; + end + if tag.name == "x" and tag.attr.xmlns == xmlns_muc_user then + return nil; + end + return tag; + end); + +end, 0); + +-- Handle messages +local function save_to_history(self, stanza) + local room_node, room_host = jid_split(self.jid); + + local stored_stanza = stanza; + + if stanza.name == "message" and self:get_whois() == "anyone" then + stored_stanza = st.clone(stanza); + local actor = jid_bare(self._occupants[stanza.attr.from].jid); + local affiliation = self:get_affiliation(actor) or "none"; + local role = self:get_role(actor) or self:get_default_role(affiliation); + stored_stanza:add_direct_child(st.stanza("x", { xmlns = xmlns_muc_user }) + :tag("item", { affiliation = affiliation; role = role; jid = actor })); + end + + -- Policy check + if not archiving_enabled(self) then return end -- Don't log + + -- And stash it + local with = stanza.name + if stanza.attr.type then + with = with .. "<" .. stanza.attr.type + end + + local id = archive:append(room_node, nil, stored_stanza, time_now(), with); + + if id then + stanza:add_direct_child(st.stanza("stanza-id", { xmlns = xmlns_st_id, by = self.jid, id = id })); + end +end + +module:hook("muc-add-history", function (event) + local room, stanza = event.room, event.stanza; + save_to_history(room, stanza); +end); + +if module:get_option_boolean("muc_log_presences", true) then + module:hook("muc-occupant-joined", function (event) + save_to_history(event.room, st.stanza("presence", { from = event.nick }):tag("x", { xmlns = "http://jabber.org/protocol/muc" })); + end); + module:hook("muc-occupant-left", function (event) + save_to_history(event.room, st.stanza("presence", { type = "unavailable", from = event.nick })); + end); +end + +if not archive.delete then + module:log("warn", "Storage driver %s does not support deletion", archive._provided_by); + module:log("warn", "Archived message will persist after a room has been destroyed"); +else + module:hook("muc-room-destroyed", function(event) + local room_node = jid_split(event.room.jid); + archive:delete(room_node); + end); +end + +-- And role/affiliation changes? + +module:add_feature(xmlns_mam); + +module:hook("muc-disco#info", function(event) + event.reply:tag("feature", {var=xmlns_mam}):up(); +end); |