diff -r a809dcfd0c5b -r 30fac9154fd4 plugins/mod_mam/mod_mam.lua
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/mod_mam/mod_mam.lua	Fri Nov 04 13:48:21 2016 +0100
@@ -0,0 +1,338 @@
+-- XEP-0313: Message Archive Management for Prosody
+-- Copyright (C) 2011-2016 Kim Alvefur
+--
+-- This file is MIT/X11 licensed.
+
+local xmlns_mam     = "urn:xmpp:mam:0";
+local xmlns_delay   = "urn:xmpp:delay";
+local xmlns_forward = "urn:xmpp:forward: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 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 = "archive2";
+local archive = assert(module:open_store(archive_store, "archive"));
+
+if archive.name == "null" or not archive.find then
+	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 cleanup;
+
+-- 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 == "get" then
+		local prefs = prefs_to_stanza(get_prefs(user));
+		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);
+
+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/self/"..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/self/"..xmlns_mam..":query", function(event)
+	local origin, stanza = event.origin, event.stanza;
+	local query = stanza.tags[1];
+	local qid = query.attr.queryid;
+
+	if cleanup then cleanup[origin.username] = true; end
+
+	-- Search query parameters
+	local qwith, 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
+		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 = true;
+	});
+
+	if not data then
+		origin.send(st.error_reply(stanza, "cancel", "internal-server-error", err));
+		return true;
+	end
+	local total = tonumber(err);
+
+	origin.send(st.reply(stanza));
+	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));
+
+	origin.send(st.message(msg_reply_attr)
+		:tag("fin", { xmlns = xmlns_mam, queryid = qid, complete = complete })
+			:add_child(rsm.generate {
+				first = first, last = last, count = total }));
+	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
+		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
+
+	-- 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 stanza:get_child("no-permanent-storage", "urn:xmpp:hints") -- The XEP needs to decide on "store" or "storage"
+	or stanza:get_child("no-permanent-store", "urn:xmpp:hints")
+	or stanza:get_child("no-storage", "urn:xmpp:hints")
+	or stanza:get_child("no-store", "urn:xmpp:hints") then
+		log("debug", "Not archiving stanza: %s (hint)", stanza:top_tag());
+		return;
+	end
+
+	-- 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);
+
+	-- 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, id = archive:append(store_user, nil, stanza, time_now(), with);
+		if ok then
+			if cleanup then cleanup[store_user] = true; end
+			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 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
+
+	cleanup = {};
+
+	pcall(function ()
+		for user in um.users(module.host) do
+			cleanup[user] = true;
+		end
+	end);
+
+	module:add_timer(math.random(10, 60), function()
+		local user = next(cleanup);
+		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);
+end
+
+-- Stanzas sent by local clients
+module:hook("pre-message/bare", c2s_message_handler, 2);
+module:hook("pre-message/full", c2s_message_handler, 2);
+-- Stanszas to local clients
+module:hook("message/bare", message_handler, 2);
+module:hook("message/full", message_handler, 2);
+
+module:add_feature(xmlns_mam); -- COMPAT with XEP-0313 v 0.1
+
+module:hook("account-disco-info", function(event)
+	(event.reply or event.stanza):tag("feature", {var=xmlns_mam}):up();
+end);
+