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kbe
248
routes/indialog.js
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248
routes/indialog.js
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const logger = require('../utils/logger');
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/**
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* In-Dialog Handler - Equivalent to Kamailio's WITHINDLG route
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* Handles SIP requests within established dialogs (BYE, re-INVITE, etc.)
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*/
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class InDialogHandler {
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constructor(srf) {
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this.srf = srf;
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}
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/**
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* Handle media teardown for BYE/CANCEL (equivalent to kamailio.cfg:494-497)
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*/
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handleMediaTeardown(req) {
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if (req.method === 'BYE' || req.method === 'CANCEL') {
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logger.info('[WITHINDLG] Media teardown for %s | Call-ID: %s', req.method, req.get('Call-ID'));
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// RTP proxy cleanup would go here
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}
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}
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/**
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* Handle media setup for ACK (equivalent to kamailio.cfg:500-502)
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*/
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handleMediaSetup(req) {
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if (req.method === 'ACK') {
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logger.info('[WITHINDLG] Media setup for ACK | Call-ID: %s', req.get('Call-ID'));
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// RTP proxy setup would go here
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}
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}
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/**
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* Process loose route headers (equivalent to kamailio.cfg:506-561)
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*/
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processLooseRoute(req, res) {
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const routeHeaders = req.get('Route');
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if (!routeHeaders) {
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return false;
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}
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logger.info('[WITHINDLG] Route headers processed | Call-ID: %s', req.get('Call-ID'));
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// Process Route headers to determine next hop
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const routes = Array.isArray(routeHeaders) ? routeHeaders : [routeHeaders];
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const nextRoute = routes[0];
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if (nextRoute.includes(this.srf.localAddress)) {
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// Route points back to us - check if user is registered locally
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const aor = `${req.uri.user}@${req.uri.host}`;
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const registration = this.srf.registrationHandler?.lookup(aor);
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if (registration) {
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logger.info('[WITHINDLG] Loose route resolved to local user, forwarding | Call-ID: %s', req.get('Call-ID'));
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return this.forwardToUser(req, res, registration);
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} else {
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logger.warn('[WITHINDLG] Loose route points to us but user not found locally | Call-ID: %s', req.get('Call-ID'));
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res.send(404, 'Not here');
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return true;
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}
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} else {
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// Route is to a different destination, process normally
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logger.info('[WITHINDLG] Forwarding to different destination | Call-ID: %s', req.get('Call-ID'));
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return this.forwardToDestination(req, res, nextRoute);
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}
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}
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/**
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* Forward request to registered user
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*/
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async forwardToUser(req, res, registration) {
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try {
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const dlg = await this.srf.createRequest(req.method, registration.contact, {
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headers: {
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'From': req.get('From'),
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'To': req.get('To'),
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'Call-ID': req.get('Call-ID'),
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'CSeq': req.get('CSeq'),
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'Contact': req.get('Contact'),
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'Content-Type': req.get('Content-Type'),
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'Via': req.get('Via'),
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'Route': req.get('Route'),
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'Max-Forwards': req.get('Max-Forwards')
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},
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body: req.body
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});
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logger.info('[WITHINDLG] Successfully forwarded to user | Call-ID: %s', req.get('Call-ID'));
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// Send response back to originator
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res.send(200, 'OK');
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// Relay responses
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this.relayResponses(dlg, req, res);
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} catch (error) {
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logger.error('[WITHINDLG] Failed to forward to user: %s | Call-ID: %s', error.message, req.get('Call-ID'));
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res.send(500, 'Server Error');
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}
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}
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/**
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* Forward request to destination
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*/
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async forwardToDestination(req, res, destination) {
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try {
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const dlg = await this.srf.createRequest(req.method, destination, {
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headers: {
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'From': req.get('From'),
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'To': req.get('To'),
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'Call-ID': req.get('Call-ID'),
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'CSeq': req.get('CSeq'),
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'Contact': req.get('Contact'),
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'Content-Type': req.get('Content-Type'),
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'Via': req.get('Via'),
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'Route': req.get('Route'),
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'Max-Forwards': req.get('Max-Forwards')
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},
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body: req.body
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});
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logger.info('[WITHINDLG] Successfully forwarded to destination | Call-ID: %s', req.get('Call-ID'));
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// Send response back to originator
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res.send(200, 'OK');
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// Relay responses
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this.relayResponses(dlg, req, res);
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} catch (error) {
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logger.error('[WITHINDLG] Failed to forward to destination: %s | Call-ID: %s', error.message, req.get('Call-ID'));
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res.send(500, 'Server Error');
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}
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}
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/**
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* Relay responses between dialogs
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*/
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relayResponses(uacDialog, uasReq, uasRes) {
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// Relay UAC responses back to UAS
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uacDialog.on('response', (response) => {
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uasRes.send(response.status, response.reason, response.headers);
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});
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// Handle UAS responses to UAC
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uasRes.on('response', (response) => {
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uacDialog.send(response.status, response.reason, response.headers);
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});
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}
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/**
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* Handle BYE request (equivalent to kamailio.cfg:508-511)
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*/
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handleBye(req, res) {
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logger.info('[WITHINDLG] BYE request | Call-ID: %s', req.get('Call-ID'));
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// Handle media teardown
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this.handleMediaTeardown(req);
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// Process routing
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if (this.processLooseRoute(req, res)) {
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return;
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}
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// If no loose route, try to find the target user
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const aor = `${req.uri.user}@${req.uri.host}`;
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const registration = this.srf.registrationHandler?.lookup(aor);
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if (registration) {
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logger.info('[WITHINDLG] BYE: Target user found locally, forwarding | Call-ID: %s', req.get('Call-ID'));
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this.forwardToUser(req, res, registration);
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} else {
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logger.warn('[WITHINDLG] BYE: Target user not found locally | Call-ID: %s', req.get('Call-ID'));
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res.send(404, 'Not here');
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}
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}
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/**
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* Handle ACK request (equivalent to kamailio.cfg:611-621)
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*/
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handleAck(req, res) {
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logger.info('[WITHINDLG] ACK request | Call-ID: %s', req.get('Call-ID'));
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// Handle media setup
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this.handleMediaSetup(req);
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// ACK is typically just absorbed
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res.send(200, 'OK');
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}
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/**
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* Handle in-dialog SUBSCRIBE (equivalent to kamailio.cfg:606-610)
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*/
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handleSubscribe(req, res) {
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logger.info('[WITHINDLG] SUBSCRIBE request | Call-ID: %s', req.get('Call-ID'));
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res.send(404, 'Not here');
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}
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/**
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* Main in-dialog request handler (equivalent to kamailio.cfg:489-627)
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*/
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async handleInDialog(req, res) {
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const method = req.method;
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const callId = req.get('Call-ID');
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logger.info('[WITHINDLG] %s request | Call-ID: %s', method, callId);
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// Handle media-related operations
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if (method === 'BYE' || method === 'CANCEL') {
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this.handleMediaTeardown(req);
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} else if (method === 'ACK') {
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this.handleMediaSetup(req);
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}
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// Process based on method
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switch (method) {
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case 'BYE':
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this.handleBye(req, res);
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break;
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case 'ACK':
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this.handleAck(req, res);
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break;
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case 'SUBSCRIBE':
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this.handleSubscribe(req, res);
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break;
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default:
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// For other methods, try to process Route headers
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if (!this.processLooseRoute(req, res)) {
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// No route found, try direct forwarding
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logger.info('[WITHINDLG] No route headers, forwarding to destination | Call-ID: %s', callId);
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const aor = `${req.uri.user}@${req.uri.host}`;
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const registration = this.srf.registrationHandler?.lookup(aor);
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if (registration) {
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this.forwardToUser(req, res, registration);
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} else {
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logger.warn('[WITHINDLG] No route found for %s | Call-ID: %s', method, callId);
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res.send(404, 'Not here');
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}
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}
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break;
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}
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}
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}
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module.exports = InDialogHandler;
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