view mod_pubsub_feeds/feeds.lib.lua @ 5401:c8d04ac200fc

mod_http_oauth2: Reject loopback URIs as client_uri This really should be a proper website with info, https://localhost is not good enough. Ideally we'd validate that it's got proper DNS and is actually reachable, but triggering HTTP or even DNS lookups seems like it would carry abuse potential that would best to avoid.
author Kim Alvefur <zash@zash.se>
date Tue, 02 May 2023 16:20:55 +0200
parents b328ca621ba6
children
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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.enclosure(atom_entry, tag)
	atom_entry:tag("link", { rel = "enclosure", href = tag.attr.url, type = tag.attr.type, length = tag.attr.length }):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
		-- Preserve Atom-namespaced items
		for atomtag in item:childtags(nil, "http://www.w3.org/2005/Atom") do
			feed:add_child(st.clone(atomtag));
		end
		feed:reset();
	end
	return feed;
end

return { translate_rss = translate_rss }