File

mod_pubsub_summary/mod_pubsub_summary.lua @ 4426:3fe2c264aac4

mod_pubsub_summary: Mangle HTML payloads in Atom/RSS feeds This module is meant for use with mod_pubsub_feeds and tries to improve on mod_pubsub's built-in Atom summary generator.
author Kim Alvefur <zash@zash.se>
date Thu, 04 Feb 2021 01:12:41 +0100
child 4435:a620bf249e63
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-- No, not trying to parse HTML here. It's an illusion. Just trying to read RSS feeds.
--
-- Compose a textual representation of Atom payloads
module:hook("pubsub-summary/http://www.w3.org/2005/Atom", function (event)
	local payload = event.payload;
	local title = payload:get_child_text("title");
	local content_tag = payload:get_child("content") or payload:get_child("summary");
	local content = content_tag:get_text();
	if content_tag.attr.type == "html" then
		content = content:gsub("\n*<p[^>]*>\n*(.-)\n*</p>\n*", "%1\n\n");
		content = content:gsub("<li>(.-)</li>\n", "* %1\n");
		content = content:gsub("<a[^>]*href=[\"'](.-)[\"'][^>]*>(.-)</a>", "%2 <%1>");
		content = content:gsub("<b>(.-)</b>", "*%1*");
		content = content:gsub("<strong>(.-)</strong>", "*%1*");
		content = content:gsub("<em>(.-)</em>", "*%1*");
		content = content:gsub("<i>(.-)</i>", "*%1*");
		content = content:gsub("<img[^>]*src=[\"'](.-)[\"'][^>]*>", " %1 "); -- TODO alt= would have been nice to grab
		content = content:gsub("<br[^>]*>", "\n");
		content = content:gsub("<[^>]+>", "");
		content = content:gsub("^%s*", ""):gsub("%s*$", "");
		content = content:gsub("\n\n\n+", "\n\n");
		content = content:gsub("&(%w+);", {
				apos = "'";
				quot = '"';
				lt = "<";
				gt = ">";
				amp = "&";
				nbsp = utf8 and utf8.char(0xa0) or " ";
			});
	end
	local link = payload:get_child("link");
	local summary;
	if title and content then
		summary = title .. "\n\n" .. content;
	elseif title or content then
		summary = content or title;
	end
	if link and link.attr.href and link.attr.href ~= content then
		summary = (summary and summary .. "\n" or "") .. link.attr.href;
	end
	return summary;
end, 1);