view mod_pubsub_feeds/feeds.lib.lua @ 3492:f59334da6df9

mod_conversejs: Show fallback text if converse.js fails to load (thanks MattJ) This can happen if javascript is enabled but 3rd party resources are blocked, or some other error happened.
author Kim Alvefur <zash@zash.se>
date Tue, 19 Mar 2019 19:43:13 +0100
parents 649f733aa3dc
children c402b273f2e3
line wrap: on
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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
	for item in channel:childtags("item") do
		feed:tag("entry");
		for tag in item:childtags() do
			local translator = rss2atom[tag.name];
			if translator then
				translator(feed, tag);
			end
		end
		feed:reset();
	end
	return feed;
end

return { translate_rss = translate_rss }