view mod_muc_eventsource/mod_muc_eventsource.lua @ 4876:0f5f2d4475b9

mod_http_xep227: Add support for import via APIs rather than direct store manipulation In particular this transitions PEP nodes and data to be imported via mod_pep's APIs, fixing issues with importing at runtime while PEP data may already be live in RAM. Next obvious candidate for this approach is rosters, so clients get immediate roster pushes and other special handling (such as emitting subscribes to reach the desired subscription state).
author Matthew Wild <mwild1@gmail.com>
date Tue, 18 Jan 2022 17:01:18 +0000
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);