From a13d3b6e15d3e44269f14bc0229ddf1f9f7a358f Mon Sep 17 00:00:00 2001
From: slavikbialik <slavikb@carbyne911.com>
Date: Sun, 28 Feb 2021 17:28:34 +0200
Subject: [PATCH 1/2] Add `onAck` delegation for Session

---
 src/api/ack.ts              | 15 +++++++++++++++
 src/api/index.ts            |  1 +
 src/api/session-delegate.ts |  7 +++++++
 src/api/session.ts          |  7 +++++++
 4 files changed, 30 insertions(+)
 create mode 100644 src/api/ack.ts

diff --git a/src/api/ack.ts b/src/api/ack.ts
new file mode 100644
index 000000000..3fc3c4285
--- /dev/null
+++ b/src/api/ack.ts
@@ -0,0 +1,15 @@
+import { IncomingRequestMessage, IncomingAckRequest } from "../core";
+
+/**
+ * A request to end a {@link Session} (incoming ACK).
+ * @public
+ */
+export class Ack {
+  /** @internal */
+  public constructor(private incomingAckRequest: IncomingAckRequest) {}
+
+  /** Incoming ACK request message. */
+  public get request(): IncomingRequestMessage {
+    return this.incomingAckRequest.message;
+  }
+}
\ No newline at end of file
diff --git a/src/api/index.ts b/src/api/index.ts
index 88daf1474..7a318eec5 100644
--- a/src/api/index.ts
+++ b/src/api/index.ts
@@ -3,6 +3,7 @@
  * @packageDocumentation
  */
 export * from "./exceptions";
+export * from "./ack";
 export * from "./bye";
 export * from "./emitter";
 export * from "./info";
diff --git a/src/api/session-delegate.ts b/src/api/session-delegate.ts
index cde5ab583..0a3f492ce 100644
--- a/src/api/session-delegate.ts
+++ b/src/api/session-delegate.ts
@@ -1,4 +1,5 @@
 import { IncomingRequestMessage } from "../core";
+import { Ack } from "./ack";
 import { Bye } from "./bye";
 import { Info } from "./info";
 import { Message } from "./message";
@@ -11,6 +12,12 @@ import { SessionDescriptionHandler } from "./session-description-handler";
  * @public
  */
 export interface SessionDelegate {
+  /**
+   * Called upon receiving an incoming in dialog ACK request.
+   * @param ack - The ack.
+   */
+  onAck?(ack: Ack): void;
+
   /**
    * Called upon receiving an incoming in dialog BYE request.
    * @param bye - The bye.
diff --git a/src/api/session.ts b/src/api/session.ts
index 17cc9f254..91f0183cb 100644
--- a/src/api/session.ts
+++ b/src/api/session.ts
@@ -29,6 +29,7 @@ import {
 } from "../core";
 import { getReasonPhrase } from "../core/messages/utils";
 import { AllowedMethods } from "../core/user-agent-core/allowed-methods";
+import { Ack } from "./ack";
 import { Bye } from "./bye";
 import { Emitter, EmitterImpl } from "./emitter";
 import { ContentTypeUnsupportedError, RequestPendingError } from "./exceptions";
@@ -793,6 +794,12 @@ export abstract class Session {
         : this._sessionDescriptionHandlerModifiers
     };
 
+    if (this.delegate && this.delegate.onAck)
+    {
+        const ack = new Ack(request);
+        this.delegate.onAck(ack);
+    }
+
     // reset pending ACK flag
     this.pendingReinviteAck = false;
 

From 71fa1a031603e917a627d16d977adbde3ca6ddd4 Mon Sep 17 00:00:00 2001
From: Slavik Bialik <littleneo@gmail.com>
Date: Sun, 28 Feb 2021 20:02:00 +0200
Subject: [PATCH 2/2] code lint-fix

---
 src/api/ack.ts     | 2 +-
 src/api/session.ts | 7 +++----
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/src/api/ack.ts b/src/api/ack.ts
index 3fc3c4285..2344448cb 100644
--- a/src/api/ack.ts
+++ b/src/api/ack.ts
@@ -12,4 +12,4 @@ export class Ack {
   public get request(): IncomingRequestMessage {
     return this.incomingAckRequest.message;
   }
-}
\ No newline at end of file
+}
diff --git a/src/api/session.ts b/src/api/session.ts
index 91f0183cb..f9090fcdf 100644
--- a/src/api/session.ts
+++ b/src/api/session.ts
@@ -794,10 +794,9 @@ export abstract class Session {
         : this._sessionDescriptionHandlerModifiers
     };
 
-    if (this.delegate && this.delegate.onAck)
-    {
-        const ack = new Ack(request);
-        this.delegate.onAck(ack);
+    if (this.delegate && this.delegate.onAck) {
+      const ack = new Ack(request);
+      this.delegate.onAck(ack);
     }
 
     // reset pending ACK flag