From 9587465e8556d5b44574d9cb63300f19e8832d01 Mon Sep 17 00:00:00 2001
From: Vinod Dharashive <vdharashive@gmail.com>
Date: Fri, 7 Apr 2023 17:03:24 +0530
Subject: [PATCH] Support for Cisco NBR for Agentassist (#303)

* NBR Support

* NBR Support

* NBR Support

* re-invite Ok sdp should be sendonly

* NBR Support

* sendrecv sdp correction

* Update siprec-utils.js

* Updated comments

* Siprec participants details added to hook

* Bugfix siprec

* Update call-info.js
---
 lib/middleware.js         | 17 ++++++++++++++---
 lib/session/call-info.js  | 17 +++++++++++++++++
 lib/utils/siprec-utils.js | 12 ++++++++++--
 3 files changed, 41 insertions(+), 5 deletions(-)

diff --git a/lib/middleware.js b/lib/middleware.js
index 47bb1814..fa3b49e0 100644
--- a/lib/middleware.js
+++ b/lib/middleware.js
@@ -46,7 +46,16 @@ module.exports = function(srf, logger) {
     }
     if (req.has('X-Authenticated-User')) req.locals.originatingUser = req.get('X-Authenticated-User');
     if (req.has('X-MS-Teams-Tenant-FQDN')) req.locals.msTeamsTenant = req.get('X-MS-Teams-Tenant-FQDN');
-
+    if (req.has('X-Cisco-Recording-Participant')) {
+      const ciscoParticipants = req.get('X-Cisco-Recording-Participant');
+      const regex = /sip:[\d]+@[\d]+\.[\d]+\.[\d]+\.[\d]+/g;
+      const sipURIs = ciscoParticipants.match(regex);
+      logger.info(`X-Cisco-Recording-Participant : ${sipURIs} `);
+      if (sipURIs && sipURIs.length > 0) {
+        req.locals.calledNumber = sipURIs[0];
+        req.locals.callingNumber = sipURIs[1];
+      }
+    }
     next();
   }
 
@@ -94,8 +103,10 @@ module.exports = function(srf, logger) {
           .find((p) => p.type === 'application/sdp')
           .content;
         const {sdp1, sdp2, ...metadata} = await parseSiprecPayload(req, logger);
-        req.locals.calledNumber = metadata.caller.number;
-        req.locals.callingNumber = metadata.callee.number;
+        if (!req.locals.calledNumber && !req.locals.calledNumber) {
+          req.locals.calledNumber = metadata.caller.number;
+          req.locals.callingNumber = metadata.callee.number;
+        }
         req.locals = {
           ...req.locals,
           siprec: {
diff --git a/lib/session/call-info.js b/lib/session/call-info.js
index 4f056018..fb7cd7fd 100644
--- a/lib/session/call-info.js
+++ b/lib/session/call-info.js
@@ -33,6 +33,23 @@ class CallInfo {
       this.callStatus = CallStatus.Trying;
       this.originatingSipIp = req.get('X-Forwarded-For');
       this.originatingSipTrunkName = req.get('X-Originating-Carrier');
+      const {siprec} = req.locals;
+      if (siprec) {
+        const caller = parseUri(req.locals.callingNumber);
+        const callee = parseUri(req.locals.calledNumber);
+        this.participants = [
+          {
+            participant: 'caller',
+            uriUser: caller.user,
+            uriHost: caller.host
+          },
+          {
+            participant: 'callee',
+            uriUser: callee.user,
+            uriHost: callee.host
+          }
+        ];
+      }
     }
     else if (opts.parentCallInfo) {
       // outbound call that is a child of an existing call
diff --git a/lib/utils/siprec-utils.js b/lib/utils/siprec-utils.js
index 1905f339..82130db8 100644
--- a/lib/utils/siprec-utils.js
+++ b/lib/utils/siprec-utils.js
@@ -47,8 +47,16 @@ const parseSiprecPayload = (req, logger) => {
       }
     }
 
-    if (!sdp || !meta) {
-      logger.info({payload: req.payload}, 'invalid SIPREC payload');
+
+    if (!meta && sdp) {
+      const arr = /^([^]+)(m=[^]+?)(m=[^]+?)$/.exec(sdp);
+      opts.sdp1 = `${arr[1]}${arr[2]}`;
+      opts.sdp2 = `${arr[1]}${arr[3]}\r\n`;
+      opts.sessionId = uuidv4();
+      logger.info({ payload: req.payload }, 'SIPREC payload with no metadata (e.g. Cisco NBR)');
+      resolve(opts);
+    } else if (!sdp || !meta) {
+      logger.info({ payload: req.payload }, 'invalid SIPREC payload');
       return reject(new Error('expected multipart SIPREC body'));
     }