view mod_http_altconnect/mod_http_altconnect.lua @ 4877:adc6241e5d16

mod_measure_process: Report the enforced limit The soft limit is what the kernel actually enforces, while the hard limit is is how far you can change the soft limit without privileges. Unless the process dynamically adjusts the soft limit, knowing the hard limit is not as useful as knowing the soft limit. Reporting the soft limit and the number of in-use FDs allows placing alerts on expressions like 'process_open_fds / process_max_fds >= 0.95'
author Kim Alvefur <zash@zash.se>
date Tue, 18 Jan 2022 18:55:20 +0100 (2022-01-18)
parents 0a0bf87ccda6
children
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-- mod_http_altconnect
-- XEP-0156: Discovering Alternative XMPP Connection Methods

module:depends"http";

local mm = require "core.modulemanager";
local json = require"util.json";
local st = require"util.stanza";
local array = require"util.array";

local function get_supported()
	local uris = array();
	if mm.is_loaded(module.host, "bosh") or  mm.is_loaded("*", "bosh") then
		uris:push({ rel = "urn:xmpp:alt-connections:xbosh", href = module:http_url("bosh", "/http-bind") });
	end
	if mm.is_loaded(module.host, "websocket") or  mm.is_loaded("*", "websocket") then
		uris:push({ rel = "urn:xmpp:alt-connections:websocket", href = module:http_url("websocket", "xmpp-websocket"):gsub("^http", "ws") });
	end
	return uris;
end


local function GET_xml(event)
	local request, response = event.request, event.response;
	local xrd = st.stanza("XRD", { xmlns='http://docs.oasis-open.org/ns/xri/xrd-1.0' });
	local uris = get_supported();
	for i, method in ipairs(uris) do
		xrd:tag("Link", method):up();
	end
	response.headers.content_type = "application/xrd+xml"
	response.headers.access_control_allow_origin = "*";
	return '<?xml version="1.0" encoding="UTF-8"?>' .. tostring(xrd);
end

local function GET_json(event)
	local request, response = event.request, event.response;
	local jrd = { links = get_supported() };
	response.headers.content_type = "application/json"
	response.headers.access_control_allow_origin = "*";
	return json.encode(jrd);
end;

local function GET_either(event)
	local accept_type = event.request.headers.accept or "";
	if ( accept_type:find("xml") or #accept_type ) < ( accept_type:find("json") or #accept_type+1 ) then
		return GET_xml(event);
	else
		return GET_json(event);
	end
end;

module:provides("http", {
	default_path = "/.well-known";
	route = {
		["GET /host-meta"] = GET_either;
		-- ["GET /host-meta.xml"] = GET_xml; -- Hmmm
		["GET /host-meta.json"] = GET_json;
	};
});