--- a/mod_mam/mod_mam.lua	Fri Jul 09 20:54:40 2021 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,433 +0,0 @@
--- XEP-0313: Message Archive Management for Prosody
--- Copyright (C) 2011-2016 Kim Alvefur
---
--- This file is MIT/X11 licensed.
-
-local xmlns_mam0    = "urn:xmpp:mam:0";
-local xmlns_mam1    = "urn:xmpp:mam:1";
-local xmlns_mam2    = "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 um = require "core.usermanager";
-local st = require "util.stanza";
-local rsm = module:require "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 "util.jid".bare;
-local jid_split = require "util.jid".split;
-local jid_prepped_split = require "util.jid".prepped_split;
-local dataform = require "util.dataforms".new;
-local host = module.host;
-
-local rm_load_roster = require "core.rostermanager".load_roster;
-
-local getmetatable = getmetatable;
-local function is_stanza(x)
-	return getmetatable(x) == st.stanza_mt;
-end
-
-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 global_default_policy = module:get_option("default_archive_policy", true);
-if global_default_policy ~= "roster" then
-	global_default_policy = module:get_option_boolean("default_archive_policy", global_default_policy);
-end
-
-local archive_store = module:get_option_string("archive_store", "archive2");
-local archive = module:open_store(archive_store, "archive");
-
-if archive.name == "null" or not archive.find then
-	-- luacheck: ignore 631
-	if not archive.find then
-		module:log("debug", "Attempt to open archive storage returned a valid driver but it does not seem to implement the storage API");
-		module:log("debug", "mod_%s does not support archiving", archive._provided_by or archive.name and "storage_"..archive.name.."(?)" or "<unknown>");
-	else
-		module:log("debug", "Attempt to open archive storage returned null driver");
-	end
-	module:log("debug", "See https://prosody.im/doc/storage and https://prosody.im/doc/archiving for more information");
-	module:log("info", "Using in-memory fallback archive driver");
-	archive = module:require "fallback_archive";
-end
-
-local use_total = true;
-
-local cleanup;
-
-local function schedule_cleanup(username)
-	if cleanup and not cleanup[username] then
-		table.insert(cleanup, username);
-		cleanup[username] = true;
-	end
-end
-
--- Handle prefs.
-local function handle_prefs(event)
-	local origin, stanza = event.origin, event.stanza;
-	local xmlns_mam = stanza.tags[1].attr.xmlns;
-	local user = origin.username;
-	if stanza.attr.type == "get" then
-		local prefs = prefs_to_stanza(get_prefs(user), xmlns_mam);
-		local reply = st.reply(stanza):add_child(prefs);
-		origin.send(reply);
-	else -- type == "set"
-		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)));
-		else
-			origin.send(st.reply(stanza));
-		end
-	end
-	return true;
-end
-
-module:hook("iq/self/"..xmlns_mam0..":prefs", handle_prefs);
-module:hook("iq/self/"..xmlns_mam1..":prefs", handle_prefs);
-module:hook("iq/self/"..xmlns_mam2..":prefs", handle_prefs);
-
-local query_form = dataform {
-	{ name = "FORM_TYPE"; type = "hidden"; value = xmlns_mam0; };
-	{ name = "with"; type = "jid-single"; };
-	{ name = "start"; type = "text-single" };
-	{ name = "end"; type = "text-single"; };
-};
-
--- Serve form
-local function handle_get_form(event)
-	local origin, stanza = event.origin, event.stanza;
-	local xmlns_mam = stanza.tags[1].attr.xmlns;
-	query_form[1].value = xmlns_mam;
-	origin.send(st.reply(stanza):query(xmlns_mam):add_child(query_form:form()));
-	return true;
-end
-
-module:hook("iq-get/self/"..xmlns_mam0..":query", handle_get_form);
-module:hook("iq-get/self/"..xmlns_mam1..":query", handle_get_form);
-module:hook("iq-get/self/"..xmlns_mam2..":query", handle_get_form);
-
--- Handle archive queries
-local function handle_mam_query(event)
-	local origin, stanza = event.origin, event.stanza;
-	local xmlns_mam = stanza.tags[1].attr.xmlns;
-	local query = stanza.tags[1];
-	local qid = query.attr.queryid;
-
-	origin.mam_requested = true;
-
-	schedule_cleanup(origin.username);
-
-	-- Search query parameters
-	local qwith, qstart, qend;
-	local form = query:get_child("x", "jabber:x:data");
-	if form then
-		local err;
-		query_form[1].value = xmlns_mam;
-		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"];
-		qwith = qwith and jid_bare(qwith); -- dataforms does jidprep
-	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 with %s from %s until %s)",
-		tostring(qid), qwith or "anyone", qstart or "the dawn of time", 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(origin.username, {
-		start = qstart; ["end"] = qend; -- Time range
-		with = qwith;
-		limit = qmax + 1;
-		before = before; after = after;
-		reverse = reverse;
-		total = use_total;
-	});
-
-	if not data then
-		origin.send(st.error_reply(stanza, "cancel", "internal-server-error", err));
-		return true;
-	end
-	local total = tonumber(err);
-
-	if xmlns_mam == xmlns_mam0 then
-		origin.send(st.reply(stanza));
-	end
-	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();
-
-		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));
-
-	local fin;
-	if xmlns_mam == xmlns_mam0 then
-		fin = st.message(msg_reply_attr);
-	else
-		fin = st.reply(stanza);
-	end
-	do
-		fin:tag("fin", { xmlns = xmlns_mam, queryid = qid, complete = complete })
-			:add_child(rsm.generate {
-				first = first, last = last, count = total })
-	end
-	origin.send(fin);
-	return true;
-end
-module:hook("iq-set/self/"..xmlns_mam0..":query", handle_mam_query);
-module:hook("iq-set/self/"..xmlns_mam1..":query", handle_mam_query);
-module:hook("iq-set/self/"..xmlns_mam2..":query", handle_mam_query);
-
-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
-		return false;
-	end
-	local prefs = get_prefs(user);
-	local rule = prefs[who];
-	module:log("debug", "%s's rule for %s is %s", user, who, tostring(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, tostring(default));
-	if default == nil then
-		default = global_default_policy;
-		module:log("debug", "Using global default rule, %s", tostring(default));
-	end
-	if default == "roster" then
-		return has_in_roster(user, who);
-	end
-	return default;
-end
-
--- 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_type = stanza.attr.type or "normal";
-	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
-
-	-- Whos 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
-	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 == module.host and by_user == store_user then
-					return nil;
-				end
-			end
-			return tag;
-		end);
-		event.stanza = stanza;
-	end
-
-	-- We store chat messages or normal messages that have a body
-	if not(orig_type == "chat" or (orig_type == "normal" and stanza:get_child("body")) ) then
-		log("debug", "Not archiving stanza: %s (type)", stanza:top_tag());
-		return;
-	end
-
-	-- or if hints suggest we shouldn't
-	if not stanza:get_child("store", "urn:xmpp:hints") then -- No hint telling us we should store
-		if stanza:get_child("no-permanent-store", "urn:xmpp:hints")
-			or stanza:get_child("no-store", "urn:xmpp:hints") then -- Hint telling us we should NOT store
-			log("debug", "Not archiving stanza: %s (hint)", stanza:top_tag());
-			return;
-		end
-	end
-
-	-- Check with the users preferences
-	if shall_store(store_user, with) then
-		log("debug", "Archiving stanza: %s", stanza:top_tag());
-
-		-- And stash it
-		local ok = archive:append(store_user, nil, stanza, time_now(), with);
-		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 = stanza, for_user = store_user, id = id });
-		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
-
-local function strip_stanza_id(event)
-	local strip_by = jid_bare(event.origin.full_jid);
-	event.stanza = st.clone(event.stanza);
-	event.stanza:maptags(function(tag)
-		if not ( tag.attr.xmlns == xmlns_st_id and tag.attr.by == strip_by ) then
-			return tag;
-		end
-	end);
-end
-
-module:hook("pre-message/bare", strip_stanza_id, 0.01);
-module:hook("pre-message/full", strip_stanza_id, 0.01);
-
-local cleanup_after = module:get_option_string("archive_expires_after", "1w");
-local cleanup_interval = module:get_option_number("archive_cleanup_interval", 4 * 60 * 60);
-if cleanup_after ~= "never" then
-	local day = 86400;
-	local multipliers = { d = day, w = day * 7, m = 31 * day, y = 365.2425 * day };
-	local n, m = cleanup_after:lower():match("(%d+)%s*([dwmy]?)");
-	if not n then
-		module:log("error", "Could not parse archive_expires_after string %q", cleanup_after);
-		return false;
-	end
-
-	cleanup_after = tonumber(n) * ( multipliers[m] or 1 );
-
-	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
-
-	-- Set of known users to do message expiry for
-	-- Populated either below or when new messages are added
-	cleanup = {};
-
-	-- Iterating over users is not supported by all authentication modules
-	-- Catch and ignore error if not supported
-	pcall(function ()
-		-- If this works, then we schedule cleanup for all known users on startup
-		for user in um.users(module.host) do
-			schedule_cleanup(user);
-		end
-	end);
-
-	-- At odd intervals, delete old messages for one user
-	module:add_timer(math.random(10, 60), function()
-		local user = table.remove(cleanup, 1);
-		if user then
-			module:log("debug", "Removing old messages for user %q", user);
-			local ok, err = archive:delete(user, { ["end"] = os.time() - cleanup_after; })
-			if not ok then
-				module:log("warn", "Could not expire archives for user %s: %s", user, err);
-			else
-				-- :affected() is a recent addition for eg SQLite3 in LuaDBI
-				pcall(function(stmt)
-					module:log("debug", "Removed %d messages", stmt:affected());
-				end, err);
-			end
-			cleanup[user] = nil;
-		end
-		return math.random(cleanup_interval, cleanup_interval * 2);
-	end);
-else
-	-- Don't ask the backend to count the potentially unbounded number of items,
-	-- it'll get slow.
-	use_total = false;
-end
-
--- Stanzas sent by local clients
-local priority = 0.075
-assert(priority < 0.1, "priority must be after mod_firewall");
-assert(priority > 0.05, "priority must be before mod_carbons");
-assert(priority > 0.01, "priority must be before strip_stanza_id");
-module:hook("pre-message/bare", c2s_message_handler, priority);
-module:hook("pre-message/full", c2s_message_handler, priority);
--- Stanszas to local clients
-priority = 0.075
-assert(priority > 0, "priority must be before mod_message");
-assert(priority < 0.1, "priority must be after mod_firewall");
-assert(priority > 0.05, "priority must be before mod_carbons");
-module:hook("message/bare", message_handler, priority);
-module:hook("message/full", message_handler, priority);
-
-module:add_feature(xmlns_mam0); -- COMPAT with XEP-0313 v 0.1
-
-module:hook("account-disco-info", function(event)
-	(event.reply or event.stanza):tag("feature", {var=xmlns_mam0}):up();
-	(event.reply or event.stanza):tag("feature", {var=xmlns_mam1}):up();
-	(event.reply or event.stanza):tag("feature", {var=xmlns_mam2}):up();
-	(event.reply or event.stanza):tag("feature", {var=xmlns_st_id}):up();
-end);
-