mod_unified_push: Allow additional CORS headers for unified push (fixes #1985) - Request header "TTL" is mandated by the HTTP Push specification RFC 8030: https://datatracker.ietf.org/doc/html/rfc8030#section-5 - Firefox sends "Content-Encoding" with a HTTP form submission, so it is required when using the Unified Push testing tool at https://unifiedpush.org/test_wp.html (with the full URL being delivered by the UP-Example Android app) Adding both headers makes the Unified Push testing tool work from the browser. Resolves: https://issues.prosody.im/1985

module:depends("http")
local pubsub_service = module:depends("pubsub").service
local json = require "util.json"

function handle_GET(event)
	local request, response = event.request, event.response
	local query = request.url.query

	if query:sub(1, 5) ~= "node=" then return 400 end

	local node = query:sub(6)
	local ok, items = pubsub_service:get_items(node, true)

	if not ok then return 404 end
	response.status_code = 200
	return json.encode(items)
end

module:provides("http", {route = {GET = handle_GET}})