view mod_muc_eventsource/mod_muc_eventsource.lua @ 4976:75b6e5df65f9

various: Improve error reporting if missing file server module on 0.12 If there is some error loading net.http.files then it would be swallowed by the pcall and then it would proceed to trying mod_http_files, which might cause unexpected behavior on 0.12 Ref #1765
author Kim Alvefur <zash@zash.se>
date Mon, 18 Jul 2022 22:47:54 +0200
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);