view mod_muc_eventsource/mod_muc_eventsource.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 39485b9bbdd6
children
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module:depends("http");
local nodeprep = require "util.encodings".stringprep.nodeprep;

local jid_split = require "util.jid".split;
local json = require "util.json";

local streams = {};

function client_closed(response)
	local node = response._eventsource_node;
	module:log("debug", "Destroying client for %q", node);
	streams[node][response] = nil;
	if next(streams[node]) == nil then
		streams[node] = nil;
	end
end

function serve_stream(event, node)
	local response = event.response;

	node = nodeprep(node);
	if node == nil then
		return 400;
	end

	module:log("debug", "Client subscribed to: %s", node);

	response.on_destroy = client_closed;
	response._eventsource_node = node;

	response.conn:write(table.concat({
		"HTTP/1.1 200 OK";
		"Content-Type: text/event-stream";
		"Access-Control-Allow-Origin: *";
		"Access-Control-Allow-Methods: GET";
		"Access-Control-Max-Age: 7200";
		"";
		"";
	}, "\r\n"));

	local clientlist = streams[node];
	if not clientlist then
		clientlist = {};
		streams[node] = clientlist;
	end
	clientlist[response] = response.conn;

	return true;
end

function handle_message(event)
	local room, stanza = event.room, event.stanza;
	local node = (jid_split(event.room.jid));
	local clientlist = streams[node];
	if not clientlist then module:log("debug", "No clients for %q", node); return; end

	-- Extract body from message
	local body = event.stanza:get_child_text("body");
	if not body then
		return;
	end
	local nick = select(3, jid_split(stanza.attr.from));
	-- Encode body and broadcast to eventsource subscribers
	local json_data = json.encode({
		nick = nick;
		body = body;
	});
	local data = "data: "..json_data:gsub("\n", "\ndata: \n").."\n\n";
	for response, conn in pairs(clientlist) do
		conn:write(data);
	end
end

module:provides("http", {
	name = "eventsource";
	route = {
		["GET /*"] = serve_stream;
	};
});


module:hook("muc-broadcast-message", handle_message);