view mod_auto156/mod_auto156.lua @ 5354:39d59d857bfb

mod_http_oauth2: Use new mod_cron API for periodic cleanup Less frequent but this isn't that important after all since, as the comment states, expired codes are not usable anyway. They're also not that large so memory usage probably doesn't matter.
author Kim Alvefur <zash@zash.se>
date Sat, 22 Apr 2023 11:59:52 +0200
parents 5d494dba9c02
children
line wrap: on
line source

-- Synthesize XEP-0156 JSON from DNS
local array = require "util.array";
local encodings = require "util.encodings";
local json = require "util.json";
local promise = require "util.promise";

local dns = require"net.adns".resolver();

local function check_dns(domain)
	return dns:lookup_promise("_xmppconnect." .. domain, "TXT");
end

local function check_domain(domain)
	return promise.resolve(domain):next(encodings.stringprep.nameprep):next(encodings.idna.to_ascii):next(
		function(domain_A)
			if not domain_A then
				return promise.reject(400);
			else
				return domain_A;
			end
		end):next(check_dns):next(function(txt)
		local uris = array();
		for _, cm in ipairs(txt) do
			local kind, uri = tostring(cm.txt):match("^_xmpp%-client%-(%w+)=([hpstw]+s?://.*)");
			if kind then
				uris:push({rel = "urn:xmpp:alt-connections:" .. kind, href = uri});
			end
		end
		if #uris == 0 then
			return promise.reject(404);
		end
		return {links=uris};
	end);
end

module:depends("http");
module:provides("http", {
	route = {
		["GET /*"] = function(_, domain)
			return check_domain(domain):next(function(altmethods)
				return {headers = {content_type = "application/json"}, body = json.encode(altmethods)};
			end);
		end,
	},
});

function module.command(args)
	local async = require "util.async";
	for _, domain in ipairs(args) do
		print(assert(async.wait_for(check_domain(domain):next(json.encode))));
	end
end