File

plugins/mod_mam/mod_mam.lua @ 13252:84c7779618b6

core.portmanager: Join strings broken into multiple lines Improves readability. Reduces line count. What's not to like? The code style and luacheck rules allows longer lines, and these strings aren't long enough to need breaking into multiple lines like this.
author Kim Alvefur <zash@zash.se>
date Sat, 29 Jul 2023 02:04:24 +0200
parent 13230:26c30844cac6
line wrap: on
line source

-- Prosody IM
-- Copyright (C) 2008-2017 Matthew Wild
-- Copyright (C) 2008-2017 Waqas Hussain
-- Copyright (C) 2011-2021 Kim Alvefur
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
-- XEP-0313: Message Archive Management for Prosody
--

local xmlns_mam     = "urn:xmpp:mam:2";
local xmlns_mam_ext = "urn:xmpp:mam:2#extended";
local xmlns_delay   = "urn:xmpp:delay";
local xmlns_forward = "urn:xmpp:forward:0";
local xmlns_st_id   = "urn:xmpp:sid:0";

local um = require "prosody.core.usermanager";
local st = require "prosody.util.stanza";
local rsm = require "prosody.util.rsm";
local get_prefs = module:require"mamprefs".get;
local set_prefs = module:require"mamprefs".set;
local prefs_to_stanza = module:require"mamprefsxml".tostanza;
local prefs_from_stanza = module:require"mamprefsxml".fromstanza;
local jid_bare = require "prosody.util.jid".bare;
local jid_split = require "prosody.util.jid".split;
local jid_resource = require "prosody.util.jid".resource;
local jid_prepped_split = require "prosody.util.jid".prepped_split;
local dataform = require "prosody.util.dataforms".new;
local get_form_type = require "prosody.util.dataforms".get_type;
local host = module.host;

local rm_load_roster = require "prosody.core.rostermanager".load_roster;

local is_stanza = st.is_stanza;
local tostring = tostring;
local time_now = require "prosody.util.time".now;
local m_min = math.min;
local timestamp, datestamp = import( "util.datetime", "datetime", "date");
local default_max_items, max_max_items = 20, module:get_option_integer("max_archive_query_results", 50, 0);
local strip_tags = module:get_option_set("dont_archive_namespaces", { "http://jabber.org/protocol/chatstates" });

local archive_store = module:get_option_string("archive_store", "archive");
local archive = module:open_store(archive_store, "archive");

local cleanup_after = module:get_option_period("archive_expires_after", "1w");
local archive_item_limit = module:get_option_integer("storage_archive_item_limit", archive.caps and archive.caps.quota or 1000, 0);
local archive_truncate = math.floor(archive_item_limit * 0.99);

if not archive.find then
	error("mod_"..(archive._provided_by or archive.name and "storage_"..archive.name).." does not support archiving\n"
		.."See https://prosody.im/doc/storage and https://prosody.im/doc/archiving for more information");
end
local use_total = module:get_option_boolean("mam_include_total", true);

function schedule_cleanup(_username, _date) -- luacheck: ignore 212
	-- Called to make a note of which users have messages on which days, which in
	-- turn is used to optimize the message expiry routine.
	--
	-- This noop is conditionally replaced later depending on retention settings
	-- and storage backend capabilities.
end

-- Handle prefs.
module:hook("iq/self/"..xmlns_mam..":prefs", function(event)
	local origin, stanza = event.origin, event.stanza;
	local user = origin.username;
	if stanza.attr.type == "set" then
		local new_prefs = stanza:get_child("prefs", xmlns_mam);
		local prefs = prefs_from_stanza(new_prefs);
		local ok, err = set_prefs(user, prefs);
		if not ok then
			origin.send(st.error_reply(stanza, "cancel", "internal-server-error", "Error storing preferences: "..tostring(err)));
			return true;
		end
	end
	local prefs = prefs_to_stanza(get_prefs(user, true));
	local reply = st.reply(stanza):add_child(prefs);
	origin.send(reply);
	return true;
end);

local query_form = dataform {
	{ name = "FORM_TYPE"; type = "hidden"; value = xmlns_mam };
	{ name = "with"; type = "jid-single" };
	{ name = "start"; type = "text-single"; datatype = "xs:dateTime" };
	{ name = "end"; type = "text-single"; datatype = "xs:dateTime" };
};

if archive.caps and archive.caps.full_id_range then
	table.insert(query_form, { name = "before-id"; type = "text-single"; });
	table.insert(query_form, { name = "after-id"; type = "text-single"; });
end

if archive.caps and archive.caps.ids then
	table.insert(query_form, { name = "ids"; type = "list-multi"; });
end


-- Serve form
module:hook("iq-get/self/"..xmlns_mam..":query", function(event)
	local origin, stanza = event.origin, event.stanza;
	get_prefs(origin.username, true);
	origin.send(st.reply(stanza):query(xmlns_mam):add_child(query_form:form()));
	return true;
end);

-- Handle archive queries
module:hook("iq-set/self/"..xmlns_mam..":query", function(event)
	local origin, stanza = event.origin, event.stanza;
	local query = stanza.tags[1];
	local qid = query.attr.queryid;

	origin.mam_requested = true;

	get_prefs(origin.username, true);

	-- Search query parameters
	local qwith, qstart, qend, qbefore, qafter, qids;
	local form = query:get_child("x", "jabber:x:data");
	if form then
		local form_type, err = get_form_type(form);
		if not form_type then
			origin.send(st.error_reply(stanza, "modify", "bad-request", "Invalid dataform: "..err));
			return true;
		elseif form_type ~= xmlns_mam then
			origin.send(st.error_reply(stanza, "modify", "bad-request", "Unexpected FORM_TYPE, expected '"..xmlns_mam.."'"));
			return true;
		end
		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
		qwith, qstart, qend = form["with"], form["start"], form["end"];
		qbefore, qafter = form["before-id"], form["after-id"];
		qids = form["ids"];
		qwith = qwith and jid_bare(qwith); -- dataforms does jidprep
	end

	-- 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 or qbefore, qset and qset.after or qafter;
	if type(before) ~= "string" then before = nil; end

	-- A reverse query needs to be flipped
	local flip = reverse;
	-- A flip-page query needs to be the opposite of that.
	if query:get_child("flip-page") then flip = not flip end

	module:log("debug", "Archive query by %s id=%s with=%s when=%s...%s rsm=%q",
		origin.username,
		qid or stanza.attr.id,
		qwith or "*",
		qstart and timestamp(qstart) or "",
		qend and timestamp(qend) or "",
		qset);

	-- Load all the data!
	local data, err = archive:find(origin.username, {
		start = qstart; ["end"] = qend; -- Time range
		with = qwith;
		limit = qmax == 0 and 0 or qmax + 1;
		before = before; after = after;
		ids = qids;
		reverse = reverse;
		total = use_total or qmax == 0;
	});

	if not data then
		module:log("debug", "Archive query id=%s failed: %s", qid or stanza.attr.id, err);
		if err == "item-not-found" then
			origin.send(st.error_reply(stanza, "modify", "item-not-found"));
		else
			origin.send(st.error_reply(stanza, "cancel", "internal-server-error"));
		end
		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
			-- We requested qmax+1 items. If that many items are retrieved then
			-- there are more results to page through, so:
			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();

		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 flip then
			results[count] = fwd_st;
		else
			origin.send(fwd_st);
		end
	end

	if flip then
		for i = #results, 1, -1 do
			origin.send(results[i]);
		end
	end
	if reverse then
		first, last = last, first;
	end

	origin.send(st.reply(stanza)
		:tag("fin", { xmlns = xmlns_mam, complete = complete })
			:add_child(rsm.generate {
				first = first, last = last, count = total }));

	-- That's all folks!
	module:log("debug", "Archive query id=%s completed, %d items returned", qid or stanza.attr.id, complete and count or count - 1);
	return true;
end);

module:hook("iq-get/self/"..xmlns_mam..":metadata", function (event)
	local origin, stanza = event.origin, event.stanza;

	local reply = st.reply(stanza):tag("metadata", { xmlns = xmlns_mam });

	do
		local first = archive:find(origin.username, { limit = 1 });
		if not first then
			origin.send(st.error_reply(stanza, "cancel", "internal-server-error"));
			return true;
		end

		local id, _, when = first();
		if id then
			reply:tag("start", { id = id, timestamp = timestamp(when) }):up();
		end
	end

	do
		local last = archive:find(origin.username, { limit = 1, reverse = true });
		if not last then
			origin.send(st.error_reply(stanza, "cancel", "internal-server-error"));
			return true;
		end

		local id, _, when = last();
		if id then
			reply:tag("end", { id = id, timestamp = timestamp(when) }):up();
		end
	end

	origin.send(reply);
	return true;
end);

local function has_in_roster(user, who)
	local roster = rm_load_roster(user, host);
	module:log("debug", "%s has %s in roster? %s", user, who, roster[who] and "yes" or "no");
	return roster[who];
end

local function shall_store(user, who)
	-- TODO Cache this?
	if not um.user_exists(user, host) then
		module:log("debug", "%s@%s does not exist", user, host)
		return false;
	end
	local prefs = get_prefs(user);
	local rule = prefs[who];
	module:log("debug", "%s's rule for %s is %s", user, who, rule);
	if rule ~= nil then
		return rule;
	end
	-- Below could be done by a metatable
	local default = prefs[false];
	module:log("debug", "%s's default rule is %s", user, default);
	if default == "roster" then
		return has_in_roster(user, who);
	end
	return default;
end

local function strip_stanza_id(stanza, user)
	if stanza:get_child("stanza-id", xmlns_st_id) then
		stanza = st.clone(stanza);
		stanza:maptags(function (tag)
			if tag.name == "stanza-id" and tag.attr.xmlns == xmlns_st_id then
				local by_user, by_host, res = jid_prepped_split(tag.attr.by);
				if not res and by_host == host and by_user == user then
					return nil;
				end
			end
			return tag;
		end);
	end
	return stanza;
end

local function should_store(stanza) --> boolean, reason: string
	local st_type = stanza.attr.type or "normal";
	-- FIXME pass direction of stanza and use that along with bare/full JID addressing
	-- for more accurate MUC / type=groupchat check

	if st_type == "headline" then
		-- Headline messages are ephemeral by definition
		return false, "headline";
	end
	if st_type == "error" then
		-- Errors not sent sent from a local client
		-- Why would a client send an error anyway?
		if jid_resource(stanza.attr.to) then
			-- Store delivery failure notifications so you know if your own messages
			-- were not delivered.
			return true, "bounce";
		else
			-- Skip errors for messages that come from your account, such as PEP
			-- notifications.
			return false, "bounce";
		end
	end
	if st_type == "groupchat" then
		-- MUC messages always go to the full JID, usually archived by the MUC
		return false, "groupchat";
	end
	if stanza:get_child("no-store", "urn:xmpp:hints")
	or stanza:get_child("no-permanent-store", "urn:xmpp:hints") then
		-- XXX Experimental XEP
		return false, "hint";
	end
	if stanza:get_child("store", "urn:xmpp:hints") then
		return true, "hint";
	end
	if stanza:get_child("body") then
		return true, "body";
	end
	if stanza:get_child("subject") then
		-- XXX Who would send a message with a subject but without a body?
		return true, "subject";
	end
	if stanza:get_child("encryption", "urn:xmpp:eme:0") then
		-- Since we can't know what an encrypted message contains, we assume it's important
		-- XXX Experimental XEP
		return true, "encrypted";
	end
	if stanza:get_child(nil, "urn:xmpp:receipts") then
		-- If it's important enough to ask for a receipt then it's important enough to archive
		-- and the same applies to the receipt
		return true, "receipt";
	end
	if stanza:get_child(nil, "urn:xmpp:chat-markers:0") then
		-- XXX Experimental XEP
		return true, "marker";
	end
	if stanza:get_child("x", "jabber:x:conference")
	or stanza:find("{http://jabber.org/protocol/muc#user}x/invite") then
		return true, "invite";
	end
	if stanza:get_child(nil, "urn:xmpp:jingle-message:0") or stanza:get_child(nil, "urn:xmpp:jingle-message:1") then
		-- XXX Experimental XEP
		return true, "jingle call";
	end

	 -- The IM-NG thing to do here would be to return `not st_to_full`
	 -- One day ...
	return false, "default";
end

module:hook("archive-should-store", function (event)
	local should, why = should_store(event.stanza);
	event.reason = why;
	return should;
end, -1)

-- Handle messages
local function message_handler(event, c2s)
	local origin, stanza = event.origin, event.stanza;
	local log = c2s and origin.log or module._log;
	local orig_from = stanza.attr.from;
	local orig_to = stanza.attr.to or orig_from;
	-- Stanza without 'to' are treated as if it was to their own bare jid

	-- Whose storage do we put it in?
	local store_user = c2s and origin.username or jid_split(orig_to);
	-- And who are they chatting with?
	local with = jid_bare(c2s and orig_to or orig_from);

	-- Filter out <stanza-id> that claim to be from us
	event.stanza = strip_stanza_id(stanza, store_user);

	local event_payload = { stanza = stanza; session = origin };
	local should = module:fire_event("archive-should-store", event_payload);
	local why = event_payload.reason;

	if not should then
		log("debug", "Not archiving stanza: %s (%s)", stanza:top_tag(), event_payload.reason);
		return;
	end

	local clone_for_storage;
	if not strip_tags:empty() then
		clone_for_storage = st.clone(stanza);
		clone_for_storage:maptags(function (tag)
			if strip_tags:contains(tag.attr.xmlns) then
				return nil;
			else
				return tag;
			end
		end);
		if #clone_for_storage.tags == 0 then
			log("debug", "Not archiving stanza: %s (empty when stripped)", stanza:top_tag());
			return;
		end
	else
		clone_for_storage = stanza;
	end

	-- Check with the users preferences
	if shall_store(store_user, with) then
		log("debug", "Archiving stanza: %s (%s)", stanza:top_tag(), why);

		-- And stash it
		local time = time_now();
		local ok, err = archive:append(store_user, nil, clone_for_storage, time, with);
		if not ok and err == "quota-limit" then
			if cleanup_after ~= math.huge then
				module:log("debug", "User '%s' over quota, cleaning archive", store_user);
				local cleaned = archive:delete(store_user, {
					["end"] = (os.time() - cleanup_after);
				});
				if cleaned then
					ok, err = archive:append(store_user, nil, clone_for_storage, time, with);
				end
			end
			if not ok and (archive.caps and archive.caps.truncate) then
				module:log("debug", "User '%s' over quota, truncating archive", store_user);
				local truncated = archive:delete(store_user, {
					truncate = archive_truncate;
				});
				if truncated then
					ok, err = archive:append(store_user, nil, clone_for_storage, time, with);
				end
			end
		end
		if ok then
			local clone_for_other_handlers = st.clone(stanza);
			local id = ok;
			clone_for_other_handlers:tag("stanza-id", { xmlns = xmlns_st_id, by = store_user.."@"..host, id = id }):up();
			event.stanza = clone_for_other_handlers;
			schedule_cleanup(store_user);
			module:fire_event("archive-message-added", { origin = origin, stanza = clone_for_storage, for_user = store_user, id = id });
		else
			log("error", "Could not archive stanza: %s", err);
		end
	else
		log("debug", "Not archiving stanza: %s (prefs)", stanza:top_tag());
	end
end

local function c2s_message_handler(event)
	return message_handler(event, true);
end

-- Filter out <stanza-id> before the message leaves the server to prevent privacy leak.
local function strip_stanza_id_after_other_events(event)
	event.stanza = strip_stanza_id(event.stanza, event.origin.username);
end

module:hook("pre-message/bare", strip_stanza_id_after_other_events, -1);
module:hook("pre-message/full", strip_stanza_id_after_other_events, -1);

-- Catch messages not stored by mod_offline and mark them as stored if they
-- have been archived. This would generally only happen if mod_offline is
-- disabled.  Otherwise the message would generate a delivery failure report,
-- which would not be accurate because it has been archived.
module:hook("message/offline/handle", function(event)
	local stanza = event.stanza;
	local user = event.username .. "@" .. host;
	if stanza:get_child_with_attr("stanza-id", xmlns_st_id, "by", user) then
		return true;
	end
end, -2);

-- Don't broadcast offline messages to clients that have queried the archive.
module:hook("message/offline/broadcast", function (event)
	if event.origin.mam_requested then
		return true;
	end
end);

if cleanup_after ~= math.huge then
	local cleanup_storage = module:open_store("archive_cleanup");
	local cleanup_map = module:open_store("archive_cleanup", "map");

	module:log("debug", "archive_expires_after = %d -- in seconds", cleanup_after);

	if not archive.delete then
		module:log("error", "archive_expires_after set but mod_%s does not support deleting", archive._provided_by);
		return false;
	end

	-- For each day, store a set of users that have new messages. To expire
	-- messages, we collect the union of sets of users from dates that fall
	-- outside the cleanup range.

	if not (archive.caps and archive.caps.wildcard_delete) then
		local last_date = require "prosody.util.cache".new(module:get_option_integer("archive_cleanup_date_cache_size", 1000, 1));
		function schedule_cleanup(username, date)
			date = date or datestamp();
			if last_date:get(username) == date then return end
			local ok = cleanup_map:set(date, username, true);
			if ok then
				last_date:set(username, date);
			end
		end
	end

	local cleanup_time = module:measure("cleanup", "times");

	local async = require "prosody.util.async";
	module:daily("Remove expired messages", function ()
		local cleanup_done = cleanup_time();

		if archive.caps and archive.caps.wildcard_delete then
			local ok, err = archive:delete(true, { ["end"] = os.time() - cleanup_after })
			if ok then
				local sum = tonumber(ok);
				if sum then
					module:log("info", "Deleted %d expired messages", sum);
				else
					-- driver did not tell
					module:log("info", "Deleted all expired messages");
				end
			else
				module:log("error", "Could not delete messages: %s", err);
			end
			cleanup_done();
			return;
		end

		local users = {};
		local cut_off = datestamp(os.time() - cleanup_after);
		for date in cleanup_storage:users() do
			if date <= cut_off then
				module:log("debug", "Messages from %q should be expired", date);
				local messages_this_day = cleanup_storage:get(date);
				if messages_this_day then
					for user in pairs(messages_this_day) do
						users[user] = true;
					end
					if date < cut_off then
						-- Messages from the same day as the cut-off might not have expired yet,
						-- but all earlier will have, so clear storage for those days.
						cleanup_storage:set(date, nil);
					end
				end
			end
		end
		local sum, num_users = 0, 0;
		for user in pairs(users) do
			local ok, err = archive:delete(user, { ["end"] = os.time() - cleanup_after; })
			if ok then
				num_users = num_users + 1;
				sum = sum + (tonumber(ok) or 0);
			else
				cleanup_map:set(cut_off, user, true);
				module:log("error", "Could not delete messages for user '%s': %s", user, err);
			end
			local wait, done = async.waiter();
			module:add_timer(0.01, done);
			wait();
		end
		module:log("info", "Deleted %d expired messages for %d users", sum, num_users);
		cleanup_done();
	end);

else
	module:log("debug", "Archive expiry disabled");
	-- Don't ask the backend to count the potentially unbounded number of items,
	-- it'll get slow.
	use_total = module:get_option_boolean("mam_include_total", false);
end

-- Stanzas sent by local clients
module:hook("pre-message/bare", c2s_message_handler, 0);
module:hook("pre-message/full", c2s_message_handler, 0);
-- Stanzas to local clients
module:hook("message/bare", message_handler, 0);
module:hook("message/full", message_handler, 0);

local advertise_extended = archive.caps and archive.caps.full_id_range and archive.caps.ids;

module:hook("account-disco-info", function(event)
	(event.reply or event.stanza):tag("feature", {var=xmlns_mam}):up();
	if advertise_extended then
		(event.reply or event.stanza):tag("feature", {var=xmlns_mam_ext}):up();
	end
	(event.reply or event.stanza):tag("feature", {var=xmlns_st_id}):up();
end);