module.host = "*" -- Global module local lxp = require "lxp"; local init_xmlhandlers = require "core.xmlhandlers" local server = require "net.server"; local httpserver = require "net.httpserver"; local sm = require "core.sessionmanager"; local sm_destroy_session = sm.destroy_session; local new_uuid = require "util.uuid".generate; local fire_event = require "core.eventmanager".fire_event; local core_process_stanza = core_process_stanza; local st = require "util.stanza"; local log = require "util.logger".init("bosh"); local stream_callbacks = { stream_tag = "http://jabber.org/protocol/httpbind|body" }; local config = require "core.configmanager"; local xmlns_bosh = "http://jabber.org/protocol/httpbind"; -- (hard-coded into a literal in session.send) local BOSH_DEFAULT_HOLD = tonumber(config.get("*", "core", "bosh_default_hold")) or 1; local BOSH_DEFAULT_INACTIVITY = tonumber(config.get("*", "core", "bosh_max_inactivity")) or 60; local BOSH_DEFAULT_POLLING = tonumber(config.get("*", "core", "bosh_max_polling")) or 5; local BOSH_DEFAULT_REQUESTS = tonumber(config.get("*", "core", "bosh_max_requests")) or 2; local BOSH_DEFAULT_MAXPAUSE = tonumber(config.get("*", "core", "bosh_max_pause")) or 300; local default_headers = { ["Content-Type"] = "text/xml; charset=utf-8" }; local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat; local os_time = os.time; local sessions = {}; local inactive_sessions = {}; -- Sessions which have no open requests -- Used to respond to idle sessions (those with waiting requests) local waiting_requests = {}; function on_destroy_request(request) waiting_requests[request] = nil; local session = sessions[request.sid]; if session then local requests = session.requests; for i,r in pairs(requests) do if r == request then requests[i] = nil; break; end end -- If this session now has no requests open, mark it as inactive if #requests == 0 and session.bosh_max_inactive and not inactive_sessions[session] then inactive_sessions[session] = os_time(); (session.log or log)("debug", "BOSH session marked as inactive at %d", inactive_sessions[session]); end end end function handle_request(method, body, request) if (not body) or request.method ~= "POST" then return "You really don't look like a BOSH client to me... what do you want?"; end if not method then log("debug", "Request %s suffered error %s", tostring(request.id), body); return; end --log("debug", "Handling new request %s: %s\n----------", request.id, tostring(body)); request.notopen = true; request.log = log; local parser = lxp.new(init_xmlhandlers(request, stream_callbacks), "|"); parser:parse(body); local session = sessions[request.sid]; if session then local r = session.requests; log("debug", "Session %s has %d out of %d requests open", request.sid, #r, session.bosh_hold); log("debug", "and there are %d things in the send_buffer", #session.send_buffer); if #r > session.bosh_hold then -- We are holding too many requests, send what's in the buffer, log("debug", "We are holding too many requests, so..."); if #session.send_buffer > 0 then log("debug", "...sending what is in the buffer") session.send(t_concat(session.send_buffer)); session.send_buffer = {}; else -- or an empty response log("debug", "...sending an empty response"); session.send(""); end elseif #session.send_buffer > 0 then log("debug", "Session has data in the send buffer, will send now.."); local resp = t_concat(session.send_buffer); session.send_buffer = {}; session.send(resp); end if not request.destroyed and session.bosh_wait then request.reply_before = os_time() + session.bosh_wait; request.on_destroy = on_destroy_request; waiting_requests[request] = true; end log("debug", "Have nothing to say, so leaving request unanswered for now"); return true; end end local function bosh_reset_stream(session) session.notopen = true; end local session_close_reply = { headers = default_headers, body = st.stanza("body", { xmlns = xmlns_bosh, type = "terminate" }), attr = {} }; local function bosh_close_stream(session, reason) (session.log or log)("info", "BOSH client disconnected"); session_close_reply.attr.condition = reason; local session_close_reply = tostring(session_close_reply); for _, held_request in ipairs(session.requests) do held_request:send(session_close_reply); held_request:destroy(); end sessions[session.sid] = nil; sm_destroy_session(session); end function stream_callbacks.streamopened(request, attr) log("debug", "BOSH body open (sid: %s)", attr.sid); local sid = attr.sid if not sid then -- New session request request.notopen = nil; -- Signals that we accept this opening tag -- TODO: Sanity checks here (rid, to, known host, etc.) if not hosts[attr.to] then -- Unknown host log("debug", "BOSH client tried to connect to unknown host: %s", tostring(attr.to)); session_close_reply.attr.condition = "host-unknown"; request:send{ headers = default_headers, body = tostring(session_close_reply) }; request.notopen = nil return; end -- New session sid = new_uuid(); local session = { type = "c2s_unauthed", conn = {}, sid = sid, rid = attr.rid, host = attr.to, bosh_version = attr.ver, bosh_wait = attr.wait, streamid = sid, bosh_hold = BOSH_DEFAULT_HOLD, bosh_max_inactive = BOSH_DEFAULT_INACTIVITY, requests = { }, send_buffer = {}, reset_stream = bosh_reset_stream, close = bosh_close_stream, dispatch_stanza = core_process_stanza }; sessions[sid] = session; log("info", "New BOSH session, assigned it sid '%s'", sid); local r, send_buffer = session.requests, session.send_buffer; local response = { headers = default_headers } function session.send(s) log("debug", "Sending BOSH data: %s", tostring(s)); local oldest_request = r[1]; while oldest_request and oldest_request.destroyed do t_remove(r, 1); waiting_requests[oldest_request] = nil; oldest_request = r[1]; end if oldest_request then log("debug", "We have an open request, so using that to send with"); response.body = t_concat{"", tostring(s), "" }; oldest_request:send(response); --log("debug", "Sent"); if oldest_request.stayopen then if #r>1 then -- Move front request to back t_insert(r, oldest_request); t_remove(r, 1); end else log("debug", "Destroying the request now..."); oldest_request:destroy(); t_remove(r, 1); end elseif s ~= "" then log("debug", "Saved to send buffer because there are %d open requests", #r); -- Hmm, no requests are open :( t_insert(session.send_buffer, tostring(s)); log("debug", "There are now %d things in the send_buffer", #session.send_buffer); end end -- Send creation response local features = st.stanza("stream:features"); fire_event("stream-features", session, features); --xmpp:version='1.0' xmlns:xmpp='urn:xmpp:xbosh' local response = st.stanza("body", { xmlns = xmlns_bosh, inactivity = tostring(BOSH_DEFAULT_INACTIVITY), polling = tostring(BOSH_DEFAULT_POLLING), requests = tostring(BOSH_DEFAULT_REQUESTS), hold = tostring(session.bosh_hold), maxpause = "120", sid = sid, ver = '1.6', from = session.host, secure = 'true', ["xmpp:version"] = "1.0", ["xmlns:xmpp"] = "urn:xmpp:xbosh", ["xmlns:stream"] = "http://etherx.jabber.org/streams" }):add_child(features); request:send{ headers = default_headers, body = tostring(response) }; request.sid = sid; return; end local session = sessions[sid]; if not session then -- Unknown sid log("info", "Client tried to use sid '%s' which we don't know about", sid); request:send{ headers = default_headers, body = tostring(st.stanza("body", { xmlns = xmlns_bosh, type = "terminate", condition = "item-not-found" })) }; request.notopen = nil; return; end if attr.type == "terminate" then -- Client wants to end this session session:close(); request.notopen = nil; return; end -- If session was inactive, make sure it is now marked as not if #session.requests == 0 then (session.log or log)("debug", "BOSH client now active again at %d", os_time()); inactive_sessions[session] = nil; end if session.notopen then local features = st.stanza("stream:features"); fire_event("stream-features", session, features); session.send(features); session.notopen = nil; end request.notopen = nil; -- Signals that we accept this opening tag t_insert(session.requests, request); request.sid = sid; end function stream_callbacks.handlestanza(request, stanza) log("debug", "BOSH stanza received: %s\n", stanza:top_tag()); local session = sessions[request.sid]; if session then if stanza.attr.xmlns == xmlns_bosh then stanza.attr.xmlns = "jabber:client"; end core_process_stanza(session, stanza); end end function on_timer() -- log("debug", "Checking for requests soon to timeout..."); -- Identify requests timing out within the next few seconds local now = os_time() + 3; for request in pairs(waiting_requests) do if request.reply_before <= now then log("debug", "%s was soon to timeout, sending empty response", request.id); -- Send empty response to let the -- client know we're still here if request.conn then sessions[request.sid].send(""); end end end now = now - 3; for session, inactive_since in pairs(inactive_sessions) do if session.bosh_max_inactive then if now - inactive_since > session.bosh_max_inactive then (session.log or log)("debug", "BOSH client inactive too long, destroying session at %d", now); sessions[session.sid] = nil; inactive_sessions[session] = nil; sm_destroy_session(session, "BOSH client silent for over "..session.bosh_max_inactive.." seconds"); end else inactive_sessions[session] = nil; end end end local ports = config.get(module.host, "core", "bosh_ports") or { 5280 }; for _, options in ipairs(ports) do local port, base, ssl, interface = 5280, "http-bind", false, nil; if type(options) == "number" then port = options; elseif type(options) == "table" then port, base, ssl, interface = options.port or 5280, options.path or "http-bind", options.ssl or false, options.interface; elseif type(options) == "string" then base = options; end httpserver.new{ port = port, base = base, handler = handle_request, ssl = ssl } end server.addtimer(on_timer);