view mod_latex/mod_latex.lua @ 3568:6b3181fe5617

mod_auth_token: Timezone fix for TOTP checking luatz.time() returns milliseconds since epoch which is in UTC time, so we don't need to convert to UTC with gmtime. By calling gmtime, TOTP validation was failing when this module wasn't running on machine set to UTC time.
author JC Brand <jc@opkode.com>
date Thu, 02 May 2019 11:07:27 +0200
parents df8da7e4c2bf
children
line wrap: on
line source

local st = require "stanza";
local urlencode = require "net.http".urlencode;

local xmlns_xhtmlim = "http://jabber.org/protocol/xhtml-im";
local xmlns_xhtml = "http://www.w3.org/1999/xhtml";

local function replace_latex(data)
	local origin, stanza = data.origin, data.stanza;
	local body = stanza:get_child_text("body");
	if not body or not body:match("%$%$") then
		return;
	end
	module:log("debug", "Replacing latex...");

	local html = st.stanza("html", { xmlns = xmlns_xhtmlim })
		:tag("body", { xmlns = xmlns_xhtml });

	local in_latex, last_char;
	for snippet, up_to in body:gmatch("(.-)%$%$()") do
		last_char = up_to;
		if in_latex then
			-- Render latex and add image, next snippet is text
			in_latex = nil;
			html:tag("img", { src = "http://www.mathtran.org/cgi-bin/mathtran?D=2;tex="..urlencode(snippet), alt = snippet }):up();
		else
			-- Add text to HTML, next snippet is latex
			in_latex = true;
			html:tag("span"):text(snippet):up();

		end
	end
	if last_char < #body then
		html:tag("span"):text(body:sub(last_char, #body)):up();
	end

	for n, tag in ipairs(stanza.tags) do
		module:log("debug", "Tag: %s|%s", tag.attr.xmlns or "", tag.name or "");
		if tag.name == "html" and tag.attr.xmlns == xmlns_xhtmlim then
			stanza.tags[n] = html;
			for n, child in ipairs(stanza) do
				if child == tag then
					stanza[n] = html;
				end
			end
			return;
		end
	end

	stanza[#stanza+1] = html;
	stanza.tags[#stanza.tags+1] = html;
end

module:hook("message/bare", replace_latex, 30);
module:hook("message/full", replace_latex, 30);