view mod_pubsub_summary/mod_pubsub_summary.lua @ 5186:fa3059e653fa

mod_http_oauth2: Implement the Implicit flow Everyone says this is insecure and bad, but it's also the only thing that makes sense for e.g. pure JavaScript clients, but hey implement this even more complicated thing instead!
author Kim Alvefur <zash@zash.se>
date Thu, 02 Mar 2023 22:06:50 +0100
parents 35085e0d52ad
children
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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");
	if title then title = title:gsub("^%s+", ""):gsub("%s+$", ""); end
	-- Note: This prefers content over summary, it was made for a news feed where
	-- the interesting stuff was in the content and the summary was .. meh.
	local content_tag = payload:get_child("content") or payload:get_child("summary");
	local content = content_tag and content_tag:get_text();
	if content and content_tag.attr.type == "html" then
		content = content:gsub("\n*<p[^>]*>\n*(.-)\n*</p>\n*", "%1\n\n");
		content = content:gsub("<li>(.-)</li>\n", "* %1\n");
		content = content:gsub("<a[^>]*href=[\"'](.-)[\"'][^>]*>(.-)</a>", "\1%1\2%2\3");
		content = content:gsub("<b>(.-)</b>", "*%1*");
		content = content:gsub("<strong>(.-)</strong>", "*%1*");
		content = content:gsub("<em>(.-)</em>", "_%1_");
		content = content:gsub("<i>(.-)</i>", "_%1_");
		content = content:gsub("<img[^>]*src=[\"'](.-)[\"'][^>]*>", " %1 "); -- TODO alt= would have been nice to grab
		content = content:gsub("<br[^>]*>", "\n");
		content = content:gsub("<[^>]+>", "");
		content = content:gsub("\1(.-)\2(.-)\3", "%2 <%1>");
		content = content:gsub("^%s*", ""):gsub("%s*$", "");
		content = content:gsub("\n\n\n+", "\n\n");
		content = content:gsub("&(%w+);", {
				apos = "'";
				quot = '"';
				lt = "<";
				gt = ">";
				amp = "&";
				nbsp = "\194\160"; -- U+00A0
			});
	end
	local summary;
	if title and content and content:sub(1, #title) ~= title then
		summary = "*" .. title .. "*\n\n" .. content;
	elseif title or content then
		summary = content or title;
	end
	for link in payload:childtags("link") do
		if link and link.attr.href and link.attr.href ~= content then
			summary = (summary and summary .. "\n" or "") .. link.attr.href;
			if link.attr.rel and link.attr.rel ~= "alternate" then summary = summary .. " [" .. link.attr.rel .. "]" end
		end
	end
	for area in payload:childtags("area", "urn:oasis:names:tc:emergency:cap:1.2") do
		local pos = area:get_child_text("circle");
		if pos then
			summary = summary .. "\n" .. "geo:"..pos:match("[%d.,]+");
		end
	end
	return summary;
end, 1);