view mod_pubsub_eventsource/mod_pubsub_eventsource.lua @ 5255:001c8fdc91a4

mod_http_oauth2: Add support for the "openid" scope This "openid" scope is there to signal access to the userinfo endpoint, which is needed for OIDC support. We don't actually check this later because the userinfo endpoint only returns info embedded in the token itself, but in the future we may want to check this more carefully.
author Kim Alvefur <zash@zash.se>
date Thu, 16 Mar 2023 17:06:35 +0100
parents 0329cf8cdecb
children
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module:depends("http");
module:depends("pubsub");

local streams = {};

local service = hosts[module.host].modules.pubsub.service;

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

	local response = event.response;
	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_update(event)
	module:log("debug", "Item published: %q", event.node);
	local node = event.node;
	local clientlist = streams[node];
	local item = event.item;
	if (item.name == "json" and item.attr.xmlns == "urn:xmpp:json:0") or (item.name == "data" and item.attr.xmlns == "https://prosody.im/protocol/data") then
		item = item[1];
	end
	local data = "data: "..tostring(item):gsub("\n", "\ndata: ").."\n\n";
	if not clientlist then module:log("debug", "No clients for %q", node); return; end
	for response, conn in pairs(clientlist) do
		conn:write(data);
	end
end

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

module:hook_object_event(service.events, "item-published", handle_update);