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mod_cloud_notify_encrypted: Ensure body substring remains valid UTF-8 The `body:sub()` call risks splitting the string in the middle of a multi-byte UTF-8 sequence. This should have been caught by util.stanza validation, but that would have caused some havoc, at the very least causing the notification to not be sent. There have been no reports of this happening. Likely because this module isn't widely deployed among users with languages that use many longer UTF-8 sequences. The util.encodings.utf8.valid() function is O(n) where only the last sequence really needs to be checked, but it's in C and expected to be fast.
author Kim Alvefur <zash@zash.se>
date Sun, 22 Aug 2021 13:22:59 +0200
parents 7dbde05b48a9
children
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-- Prosody IM
-- Copyright (C) 2012 Florian Zeitz
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--

local st = require "util.stanza";
local jid = require "util.jid";

module:hook("message/host", function (event)
	local origin, stanza = event.origin, event.stanza;
	local node, host, resource = jid.split(stanza.attr.to);
	local body = stanza:get_child_text("body");

	if resource ~= "conformance" then
		return; -- Not interop testing
	end

	if body == "PI" then
		origin.send("<?testing this='out'?>");
	elseif body == "comment" then
		origin.send("<!-- no comment -->");
	elseif body == "DTD" then
		origin.send("<!DOCTYPE greeting [\n<!ENTITY test 'You should not see this'>\n]>");
	elseif body == "entity" then
		origin.send("<message type='chat' to='"..stanza.attr.from.."'><body>&test;</body></message>");
	else
		local reply = st.reply(stanza);
		reply:body("Send me one of: PI, comment, DTD, or entity");
		origin.send(reply);
	end

	return true;
end);