--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_pubsub_feeds/feeds.lib.lua	Sun Mar 20 12:32:45 2016 +0100
@@ -0,0 +1,80 @@
+local st = require "util.stanza";
+-- RSS->Atom translator
+-- http://code.matthewwild.co.uk/lua-feeds/
+
+-- Helpers to translate item child elements
+local rss2atom = {};
+function rss2atom.title(atom_entry, tag)
+	atom_entry:tag("title"):text(tag:get_text()):up();
+end
+
+function rss2atom.link(atom_entry, tag)
+	atom_entry:tag("link", { href = tag:get_text() }):up();
+end
+
+function rss2atom.author(atom_entry, tag)
+	atom_entry:tag("author")
+		:tag("email"):text(tag:get_text()):up()
+	:up();
+end
+
+function rss2atom.guid(atom_entry, tag)
+	atom_entry:tag("id"):text(tag:get_text()):up();
+end
+
+function rss2atom.category(atom_entry, tag)
+	atom_entry:tag("category", { term = tag:get_text(), scheme = tag.attr.domain }):up();
+end
+
+function rss2atom.description(atom_entry, tag)
+	atom_entry:tag("summary"):text(tag:get_text()):up();
+end
+
+local months = {
+	jan = "01", feb = "02", mar = "03", apr = "04", may = "05", jun = "06";
+	jul = "07", aug = "08", sep = "09", oct = "10", nov = "11", dec = "12";
+};
+
+function rss2atom.pubDate(atom_entry, tag)
+	local pubdate = tag:get_text():gsub("^%a+,", ""):gsub("^%s*", "");
+	local date, month, year, hour, minute, second, zone =
+		pubdate:match("^(%d%d?) (%a+) (%d+) (%d+):(%d+):?(%d*) ?(.*)$");
+	if not date then return; end
+	if #date == 1 then
+		date = "0"..date;
+	end
+	month = months[month:sub(1,3):lower()];
+	if #year == 2 then -- GAH!
+		if tonumber(year) > 80 then
+			year = "19"..year;
+		else
+			year = "20"..year;
+		end
+	end
+	if zone == "UT" or zone == "GMT" then zone = "Z"; end
+	if #second == 0 then
+		second = "00";
+	end
+	local date_string = string.format("%s-%s-%sT%s:%s:%s%s", year, month, date, hour, minute, second, zone);
+	atom_entry:tag("published"):text(date_string):up();
+end
+
+-- Translate a single item to atom
+local function translate_rss(rss_feed)
+	local feed = st.stanza("feed", { xmlns = "http://www.w3.org/2005/Atom" });
+	local channel = rss_feed:get_child("channel");
+	-- TODO channel properties
+	feed:tag("entry");
+	for item in channel:childtags("item") do
+		for tag in rss_item:childtags() do
+			local translator = rss2atom[tag.name];
+			if translator then
+				translator(feed, tag);
+			end
+		end
+	end
+	feed:reset();
+	return feed;
+end
+
+return { translate_rss = translate_rss }