prosody-modules
806f7c8d830b
mod_http_prebind/mod_http_prebind.lua

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mod_http_prebind/mod_http_prebind.lua @ 4887:806f7c8d830b

mod_ping_muc: Remove 'kick' status code The intent is "you fell off", not "you were kicked out", however older clients may not recognise the 333 code, but that will have to be an acceptable loss.
author Kim Alvefur <zash@zash.se>
date Mon, 07 Feb 2022 16:52:19 +0100
parent 4230:495a23d61418
line wrap: on
line source

module:depends("http");

local http = require "net.http";
local format = require "util.format".format;
local json_encode = require "util.json".encode;
local promise = require "util.promise";
local xml = require "util.xml";
local t_insert = table.insert;

local function new_options(host)
	return {
		headers = {
			["Content-Type"] = "text/xml; charset=utf-8",
			["Host"] = host,
		},
		method = "POST",
	};
end

local function connect_to_bosh(url, hostname)
	local rid = math.random(100000, 100000000)
	local options = new_options(hostname);
	options.body = format([[<body content='text/xml; charset=utf-8'
	      hold='1'
	      rid='%d'
	      to='%s'
	      wait='60'
	      xml:lang='en'
	      xmpp:version='1.0'
	      xmlns='http://jabber.org/protocol/httpbind'
	      xmlns:xmpp='urn:xmpp:xbosh'/>]], rid, hostname);
	local rid = rid + 1;
	return promise.new(function (on_fulfilled, on_error)
		assert(http.request(url, options, function (body, code)
			if code ~= 200 then
				on_error("Failed to fetch, HTTP error code "..code);
				return;
			end
			local body = xml.parse(body);
			local sid = body.attr.sid;
			local mechanisms = {};
			for mechanism in body:get_child("features", "http://etherx.jabber.org/streams")
				:get_child("mechanisms", "urn:ietf:params:xml:ns:xmpp-sasl")
					:childtags("mechanism", "urn:ietf:params:xml:ns:xmpp-sasl") do
				mechanisms[mechanism:get_text()] = true;
			end
			on_fulfilled({ url = url, sid = sid, rid = rid, mechanisms = mechanisms });
		end));
	end);
end

local function authenticate(data)
	local options = new_options();
	options.body = format([[<body sid='%s'
	      rid='%d'
	      xmlns='http://jabber.org/protocol/httpbind'>
		<auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl'
		      mechanism='ANONYMOUS'/>
	</body>]], data.sid, data.rid);
	data.rid = data.rid + 1;
	return promise.new(function (on_fulfilled, on_error)
		if data.mechanisms["ANONYMOUS"] == nil then
			on_error("No SASL ANONYMOUS mechanism supported on this host.");
			return;
		end
		assert(http.request(data.url, options, function (body, code)
			if code ~= 200 then
				on_error("Failed to fetch, HTTP error code "..code);
				return;
			end
			local body = xml.parse(body);
			local success = body:get_child("success", "urn:ietf:params:xml:ns:xmpp-sasl");
			if success then
				data.mechanisms = nil;
				on_fulfilled(data);
			else
				on_error("Authentication failed.");
			end
		end));
	end);
end;

local function restart_stream(data)
	local options = new_options();
	options.body = format([[
	<body sid='%s'
	      rid='%d'
	      xml:lang='en'
	      xmlns='http://jabber.org/protocol/httpbind'
	      xmlns:xmpp='urn:xmpp:xbosh'
	      xmpp:restart='true'/>]], data.sid, data.rid);
	data.rid = data.rid + 1;
	return promise.new(function (on_fulfilled, on_error)
		assert(http.request(data.url, options, function (body, code)
			if code ~= 200 then
				on_error("Failed to fetch, HTTP error code "..code);
				return;
			end
			local body = xml.parse(body);
			on_fulfilled(data);
		end));
	end);
end;

local function bind(data)
	local options = new_options();
	options.body = format([[
	<body sid='%s'
	      rid='%d'
	      xmlns='http://jabber.org/protocol/httpbind'>
		<iq xmlns='jabber:client'
		    type='set'>
			<bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'/>
		</iq>
	</body>]], data.sid, data.rid);
	data.rid = data.rid + 1;
	return promise.new(function (on_fulfilled, on_error)
		assert(http.request(data.url, options, function (body, code)
			if code ~= 200 then
				on_error("Failed to fetch, HTTP error code "..code);
				return;
			end
			local body = xml.parse(body);
			local jid = body:get_child("iq", "jabber:client")
				:get_child("bind", "urn:ietf:params:xml:ns:xmpp-bind")
					:get_child_text("jid", "urn:ietf:params:xml:ns:xmpp-bind");
			on_fulfilled(json_encode({rid = data.rid, sid = data.sid, jid = jid}));
		end));
	end);
end;

module:provides("http", {
	route = {
		["GET"] = function (event)
			return connect_to_bosh("http://[::1]:5280/http-bind", module.host)
				:next(authenticate)
				:next(restart_stream)
				:next(bind);
		end;
	};
});