# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1325865012 -3600
# Node ID eff140d53b83d53075c9b71fb86a08ffb6ab8baa
# Parent  0c756f62758d654e588de83298139737a6e5202a
mod_mam: Add experimental implementation of the Message Archive Management ProtoXEP

diff -r 0c756f62758d -r eff140d53b83 mod_mam/mod_mam.lua
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_mam/mod_mam.lua	Fri Jan 06 16:50:12 2012 +0100
@@ -0,0 +1,127 @@
+-- XEP-xxxx: Message Archive Management for Prosody
+-- Copyright (C) 2011-2012 Kim Alvefur
+--
+-- This file is MIT/X11 licensed.
+--
+-- Based on MAM ProtoXEP Version 0.1 (2010-07-01)
+
+local st = require "util.stanza";
+local jid_bare = require "util.jid".bare;
+local jid_split = require "util.jid".split;
+local xmlns_mam     = "urn:xmpp:mam:tmp";
+local xmlns_delay   = "urn:xmpp:delay";
+local xmlns_forward = "urn:xmpp:forward:0";
+local host_sessions = hosts[module.host].sessions;
+local dm_list_load = require "util.datamanager".list_load
+local dm_list_append = require "util.datamanager".list_append
+local time_now = os.time;
+local timestamp, timestamp_parse = require "util.datetime".datetime, require "util.datetime".parse;
+local uuid = require "util.uuid".generate;
+
+-- TODO This, and appropritate filtering in message_handler()
+module:hook("iq/self/"..xmlns_mam..":prefs", function(event)
+	local origin, stanza = event.origin, event.stanza;
+	if stanza.attr.type == "get" then
+		-- Not implemented yet, hardcoded to store everything.
+		origin.send(st.reply(stanza)
+			:tag("prefs", { xmlns = xmlns_mam, default = "always" }));
+		return true
+	else -- type == "set"
+		-- TODO
+	end
+end);
+
+module:hook("iq/self/"..xmlns_mam..":query", function(event)
+	local origin, stanza = event.origin, event.stanza;
+	local query = stanza.tags[1];
+	if stanza.attr.type == "get" then
+		local qid = query.attr.queryid;
+
+		-- Search query parameters
+		local qwith = query:get_child_text("with");
+		local qstart = query:get_child_text("start");
+		local qend = query:get_child_text("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");
+		
+		local qwith = qwith and jid_bare(qwith); -- FIXME Later, full vs bare query.
+		qstart, qend = (qstart and timestamp_parse(qstart)), (qend and timestamp_parse(qend))
+
+		-- Load all the data!
+		local data, err = dm_list_load(origin.username, origin.host, "archive2"); --FIXME Decide storage name. achive2, [sm]am, archive_ng, for_fra_and_nsa
+		module:log("debug", "Loaded %d items, about to filter", #(data or {}));
+		for i=1,#data do
+			local item = data[i];
+			local when, with = item.when, item.with_bare;
+			local ts = item.timestamp;
+			-- FIXME Premature optimization: Bare JIDs only
+			--module:log("debug", "message with %s when %s", with, when or "???");
+			-- Apply query filter
+			if (not qwith or qwith == with)
+					and (not qstart or when >= qstart)
+					and (not qend or when <= qend) then
+				-- Optimizable? Do this when archiving?
+				--module:log("debug", "sending");
+				local fwd_st = st.message{ to = origin.full_jid }
+					:tag("result", { xmlns = xmlns_mam, queryid = qid }):up()
+					:tag("forwarded", { xmlns = xmlns_forward })
+						:tag("delay", { xmlns = xmlns_delay, stamp = ts or timestamp(when) }):up();
+				local orig_stanza = st.deserialize(item.stanza);
+				orig_stanza.attr.xmlns = "jabber:client";
+				fwd_st:add_child(orig_stanza);
+				origin.send(fwd_st);
+			end
+		end
+		-- That's all folks!
+		module:log("debug", "Archive query %s completed", tostring(qid));
+		origin.send(st.reply(stanza));
+		return true
+	end
+end);
+
+local function message_handler(event, c2s)
+	local origin, stanza = event.origin, event.stanza;
+	local orig_type = stanza.attr.type or "normal";
+	local orig_to = stanza.attr.to;
+	local orig_from = stanza.attr.from;
+
+	if not orig_from and c2s then
+		orig_from = origin.full_jid;
+	end
+
+	-- Don't store messages of these types
+	if orig_type == "error"
+	or orig_type == "headline"
+	or orig_type == "groupchat" then
+		return;
+		-- TODO Maybe headlines should be configurable?
+		-- TODO Write a mod_mam_muc for groupchat messages.
+	end
+
+	-- Stamp "We archived this" on the message
+	stanza:tag("archived", { xmlns = xmlns_mam, by = module.host, id = uuid() });
+	local store_user, store_host = jid_split(c2s and orig_from or orig_to);
+
+	local when = time_now();
+	-- And stash it
+	dm_list_append(store_user, store_host, "archive2", {
+		when = when, -- This might be an UNIX timestamp. Probably.
+		timestamp = timestamp(when), -- Textual timestamp. But I'll assume that comparing numbers is faster and less annoying in case of timezones.
+		with = c2s and orig_to or orig_from,
+		with_bare = jid_bare(c2s and orig_to or orig_from), -- Premature optimization, to avoid loads of jid_bare() calls when filtering.
+		stanza = st.preserialize(stanza)
+	});
+end
+
+local function c2s_message_handler(event)
+	return message_handler(event, true);
+end
+
+-- Stanzas sent by local clients
+module:hook("pre-message/bare", c2s_message_handler, 1);
+module:hook("pre-message/full", c2s_message_handler, 1);
+-- Stanszas to local clients
+module:hook("message/bare", message_handler, 1);
+module:hook("message/full", message_handler, 1);
+
+module:add_feature(xmlns_mam);