view mod_pubsub_feeds/feeds.lib.lua @ 5255:001c8fdc91a4

mod_http_oauth2: Add support for the "openid" scope This "openid" scope is there to signal access to the userinfo endpoint, which is needed for OIDC support. We don't actually check this later because the userinfo endpoint only returns info embedded in the token itself, but in the future we may want to check this more carefully.
author Kim Alvefur <zash@zash.se>
date Thu, 16 Mar 2023 17:06:35 +0100
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 }