# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1522691084 -7200
# Node ID 7ee93b3fa16075d9f0d3f65eef568f1c6a3e9421
# Parent  b773b15fee71cb35236d7e6d3c85e8aef93c144f
mod_muc_mam: Import mod_mam_muc from prosody-modules ba6466fa6823

diff -r b773b15fee71 -r 7ee93b3fa160 CHANGES
--- a/CHANGES	Thu Apr 05 17:53:51 2018 +0200
+++ b/CHANGES	Mon Apr 02 19:44:44 2018 +0200
@@ -13,6 +13,7 @@
 -   Persistence of PubSub data (applies to mod\_pubsub and mod\_pep\_plus)
 -   Asynchronous operations
 -   Busted for tests
+-   mod\_muc\_mam (XEP-0313 in groupchats)
 
 0.10.0
 ======
diff -r b773b15fee71 -r 7ee93b3fa160 plugins/mod_muc_mam.lua
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/mod_muc_mam.lua	Mon Apr 02 19:44:44 2018 +0200
@@ -0,0 +1,462 @@
+-- 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 it = require"util.iterators";
+
+-- Support both old and new MUC code
+local mod_muc = module:depends"muc";
+local rooms = rawget(mod_muc, "rooms");
+local each_room = rawget(mod_muc, "each_room") or function() return it.values(rooms); end;
+local new_muc = not rooms;
+if new_muc then
+	rooms = module:shared"muc/rooms";
+else
+	-- COMPAT: We don't (currently?) support injecting stanza-id
+	-- on Prosody 0.10 and prior, which is required by mam:2
+	xmlns_mam = "urn:xmpp:mam:1";
+end
+local get_room_from_jid = rawget(mod_muc, "get_room_from_jid") or
+	function (jid)
+		return rooms[jid];
+	end
+
+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
+
+local send_history, save_to_history;
+
+	-- Override history methods for all rooms.
+if not new_muc then -- 0.10 or older
+	module:hook("muc-room-created", function (event)
+		local room = event.room;
+		if archiving_enabled(room) then
+			room.send_history = send_history;
+			room.save_to_history = save_to_history;
+		end
+	end);
+
+	function module.load()
+		for room in each_room() do
+			if archiving_enabled(room) then
+				room.send_history = send_history;
+				room.save_to_history = save_to_history;
+			end
+		end
+	end
+	function module.unload()
+		for room in each_room() do
+			if room.send_history == send_history then
+				room.send_history = nil;
+				room.save_to_history = nil;
+			end
+		end
+	end
+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", function(event)
+		local room, fields, changed = event.room, event.fields, event.changed;
+		local new = fields[muc_form_enable];
+		if new ~= room._data.archiving then
+			room._data.archiving = new;
+			if type(changed) == "table" then
+				changed[muc_form_enable] = true;
+			else
+				event.changed = true;
+			end
+			if new then
+				room.send_history = send_history;
+				room.save_to_history = save_to_history;
+			else
+				room.send_history = nil;
+				room.save_to_history = nil;
+			end
+		end
+	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 or math.huge;
+	local maxchars = event.maxchars;
+	local since = event.since;
+	local to = event.to;
+
+	-- Load all the data!
+	local query = {
+		limit = math.min(maxstanzas, get_historylength(room));
+		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);
+
+function send_history(self, to, stanza)
+	local maxchars, maxstanzas, seconds, since;
+	local history_tag = stanza:find("{http://jabber.org/protocol/muc}x/history")
+	if history_tag then
+		module:log("debug", tostring(history_tag));
+		local history_attr = history_tag.attr;
+		maxchars = tonumber(history_attr.maxchars);
+		maxstanzas = tonumber(history_attr.maxstanzas);
+		seconds = tonumber(history_attr.seconds);
+		since = history_attr.since;
+		if since then
+			since = timestamp_parse(since);
+		end
+		if seconds then
+			since = math.max(os.time() - seconds, since or 0);
+		end
+	end
+
+	local event = {
+		room = self;
+		to = to; -- `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
+		self:_route_stanza(msg);
+	end
+end
+
+-- Handle messages
+function save_to_history(self, stanza)
+	local room_node, room_host = jid_split(self.jid);
+
+	-- 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) == self.jid then
+			return nil;
+		end
+		if tag.name == "x" and tag.attr.xmlns == xmlns_muc_user then
+			return nil;
+		end
+		return tag;
+	end);
+
+	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-broadcast-message", function (event)
+	local room, stanza = event.room, event.stanza;
+	if stanza:get_child("body") then
+		save_to_history(room, stanza);
+	end
+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 }));
+	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);