Fixed an issue where group invite auto accept wasn't sending a response

SessionMessagingKit/Database/Models/ClosedGroup.swift

@@ -181,12 +181,12 @@ public extension ClosedGroup {
         case userGroup
     }
     
-    static func approveGroup(
+    @discardableResult static func approveGroup(
         _ db: Database,
         group: ClosedGroup,
         calledFromConfigHandling: Bool,
         using dependencies: Dependencies
-    ) throws {
+    ) throws -> Job? {
         guard let userED25519KeyPair: KeyPair = Identity.fetchUserEd25519KeyPair(db, using: dependencies) else {
             throw MessageReceiverError.noUserED25519KeyPair
         }
@@ -223,7 +223,20 @@ public extension ClosedGroup {
             )
         }
         
-        /// Start polling
+        /// Schedule a `pollResponseJob` to be triggered once the first poll completes the start polling
+        let pollResponseJob: Job? = dependencies[singleton: .jobRunner].add(
+            db,
+            job: Job(variant: .manualResultJob),
+            canStartJob: true,
+            using: dependencies
+        )
+        dependencies[singleton: .groupsPoller].afterNextPoll(for: group.id) { _ in
+            dependencies[singleton: .jobRunner].manuallyTriggerResult(
+                pollResponseJob,
+                result: .succeeded,
+                using: dependencies
+            )
+        }
         dependencies[singleton: .groupsPoller].startIfNeeded(for: group.id, using: dependencies)
         
         /// Subscribe for group push notifications
@@ -239,6 +252,8 @@ public extension ClosedGroup {
                 .subscribe(on: DispatchQueue.global(qos: .userInitiated), using: dependencies)
                 .sinkUntilComplete()
         }
+        
+        return pollResponseJob
     }
     
     static func removeData(

SessionMessagingKit/Sending & Receiving/Message Handling/MessageReceiver+Groups.swift

@@ -134,8 +134,7 @@ extension MessageReceiver {
             groupSessionId: message.groupSessionId,
             using: dependencies
         )
-        
+        let pollResponseJob: Job? = try MessageReceiver.handleNewGroup(
-        try MessageReceiver.handleNewGroup(
             db,
             groupSessionId: message.groupSessionId.hexString,
             groupIdentityPrivateKey: nil,
@@ -190,8 +189,28 @@ extension MessageReceiver {
         ).inserted(db)
         
         /// Notify the user about the group message request if needed
-        guard !inviteSenderIsApproved else { return }
+        switch inviteSenderIsApproved {
+            /// If the sender was approved then this group will be auto-accepted and we should send the
+            /// `GroupUpdateInviteResponseMessage` to the group
+            case true:
+                /// If we aren't creating a new thread (ie. sending a message request) then send a
+                /// `GroupUpdateInviteResponseMessage` to the group (this allows other members
+                /// to know that the user has joined the group)
+                try MessageSender.send(
+                    db,
+                    message: GroupUpdateInviteResponseMessage(
+                        isApproved: true,
+                        sentTimestamp: UInt64(SnodeAPI.currentOffsetTimestampMs(using: dependencies))
+                    ),
+                    interactionId: nil,
+                    threadId: message.groupSessionId.hexString,
+                    threadVariant: .group,
+                    after: pollResponseJob,
+                    using: dependencies
+                )
                 
+            /// If the sender wasn't approved this is a message request so we should notify the user about the invite
+            case false:
                 let isMainAppActive: Bool = dependencies[defaults: .appGroup, key: .isMainAppActive]
                 dependencies[singleton: .notificationsManager].notifyUser(
                     db,
@@ -208,8 +227,9 @@ extension MessageReceiver {
                     using: dependencies
                 )
         }
+    }
     
-    internal static func handleNewGroup(
+    @discardableResult internal static func handleNewGroup(
         _ db: Database,
         groupSessionId: String,
         groupIdentityPrivateKey: Data?,
@@ -219,7 +239,7 @@ extension MessageReceiver {
         invited: Bool,
         calledFromConfigHandling: Bool,
         using dependencies: Dependencies
-    ) throws {
+    ) throws -> Job? {
         // Create the group
         try SessionThread.fetchOrCreate(
             db,
@@ -254,9 +274,9 @@ extension MessageReceiver {
         }
         
         // If the group is not in the invite state then handle the approval process
-        guard !invited else { return }
+        guard !invited else { return nil }
         
-        try ClosedGroup.approveGroup(
+        return try ClosedGroup.approveGroup(
             db,
             group: closedGroup,
             calledFromConfigHandling: calledFromConfigHandling,