fix call kit not working when the screen is locked

Session/Calls/Call Management/SessionCall.swift

@@ -2,6 +2,7 @@ import Foundation
 import WebRTC
 import SessionMessagingKit
 import PromiseKit
+import CallKit
 
 public final class SessionCall: NSObject, WebRTCSessionDelegate {
     // MARK: Metadata Properties
@@ -13,6 +14,7 @@ public final class SessionCall: NSObject, WebRTCSessionDelegate {
     var remoteSDP: RTCSessionDescription? = nil
     var callMessageTimestamp: UInt64?
     var isWaitingForRemoteSDP = false
+    var answerCallAction: CXAnswerCallAction? = nil
     var contactName: String {
         let contact = Storage.shared.getContact(with: self.sessionID)
         return contact?.displayName(for: Contact.Context.regular) ?? self.sessionID
@@ -181,8 +183,9 @@ public final class SessionCall: NSObject, WebRTCSessionDelegate {
         })
     }
     
-    func answerSessionCall() {
+    func answerSessionCall(action: CXAnswerCallAction) {
         guard case .answer = mode else { return }
+        answerCallAction = action
         hasStartedConnecting = true
         if let sdp = remoteSDP {
             webRTCSession.handleRemoteSDP(sdp, from: sessionID) // This sends an answer message internally
@@ -249,6 +252,7 @@ public final class SessionCall: NSObject, WebRTCSessionDelegate {
     // MARK: Delegate
     public func webRTCIsConnected() {
         self.hasConnected = true
+        self.answerCallAction?.fulfill()
     }
     
     public func isRemoteVideoDidChange(isEnabled: Bool) {

Session/Calls/Call Management/SessionCallManager+CXCallController.swift

@@ -4,6 +4,7 @@ import SessionUtilitiesKit
 extension SessionCallManager {
     public func startCall(_ call: SessionCall, completion: ((Error?) -> Void)?) {
         guard case .offer = call.mode else { return }
+        guard !call.hasConnected else { return }
         let handle = CXHandle(type: .generic, value: call.sessionID)
         let startCallAction = CXStartCallAction(call: call.uuid, handle: handle)
         

Session/Calls/Call Management/SessionCallManager+CXProvider.swift

@@ -15,18 +15,22 @@ extension SessionCallManager: CXProviderDelegate {
     
     public func provider(_ provider: CXProvider, perform action: CXAnswerCallAction) {
         AssertIsOnMainThread()
+        print("[CallKit] Perform CXAnswerCallAction")
         guard let call = self.currentCall else { return action.fail() }
-        if let _ = CurrentAppContext().frontmostViewController() as? CallVC {
+        if CurrentAppContext().isMainAppAndActive {
-            call.answerSessionCall()
+            if let _ = CurrentAppContext().frontmostViewController() as? CallVC {
-        } else {
+                call.answerSessionCall(action: action)
-            let userDefaults = UserDefaults.standard
-            if userDefaults[.hasSeenCallIPExposureWarning] {
-                showCallVC()
             } else {
-                showCallModal()
+                let userDefaults = UserDefaults.standard
+                if userDefaults[.hasSeenCallIPExposureWarning] {
+                    showCallVC()
+                } else {
+                    showCallModal()
+                }
             }
+        } else {
+            call.answerSessionCall(action: action)
         }
-        action.fulfill()
     }
     
     public func provider(_ provider: CXProvider, perform action: CXEndCallAction) {
@@ -37,6 +41,14 @@ extension SessionCallManager: CXProviderDelegate {
         action.fulfill()
     }
     
+    public func provider(_ provider: CXProvider, perform action: CXSetMutedCallAction) {
+        print("[CallKit] Perform CXSetMutedCallAction, isMuted: \(action.isMuted)")
+        AssertIsOnMainThread()
+        guard let call = self.currentCall else { return action.fail() }
+        call.isMuted = action.isMuted
+        action.fulfill()
+    }
+    
     public func provider(_ provider: CXProvider, perform action: CXSetHeldCallAction) {
         // TODO: set on hold
     }

Session/Calls/CallVC.swift

@@ -49,7 +49,7 @@ final class CallVC : UIViewController, VideoPreviewDelegate {
     
     private lazy var minimizeButton: UIButton = {
         let result = UIButton(type: .custom)
-        result.isHidden = true
+        result.isHidden = !call.hasConnected
         let image = UIImage(named: "Minimize")!.withTint(.white)
         result.setImage(image, for: UIControl.State.normal)
         result.set(.width, to: 60)
@@ -60,6 +60,7 @@ final class CallVC : UIViewController, VideoPreviewDelegate {
     
     private lazy var answerButton: UIButton = {
         let result = UIButton(type: .custom)
+        result.isHidden = call.hasConnected
         let image = UIImage(named: "AnswerCall")!.withTint(.white)
         result.setImage(image, for: UIControl.State.normal)
         result.set(.width, to: 60)
@@ -108,7 +109,7 @@ final class CallVC : UIViewController, VideoPreviewDelegate {
         result.setImage(image, for: UIControl.State.normal)
         result.set(.width, to: 60)
         result.set(.height, to: 60)
-        result.backgroundColor = UIColor(hex: 0x1F1F1F)
+        result.backgroundColor = call.isMuted ? Colors.destructive : UIColor(hex: 0x1F1F1F)
         result.layer.cornerRadius = 30
         result.addTarget(self, action: #selector(switchAudio), for: UIControl.Event.touchUpInside)
         return result

Session/Meta/AppDelegate.m

@@ -407,6 +407,7 @@ static NSTimeInterval launchStartedAt;
             if (CurrentAppContext().isMainApp) {
                 [SNJobQueue.shared resumePendingJobs];
                 [self syncConfigurationIfNeeded];
+                [self handleAppActivatedWithOngoingCallIfNeeded];
             }
         });
     }

Session/Meta/AppDelegate.swift

@@ -6,6 +6,20 @@ import UIKit
 extension AppDelegate {
 
     // MARK: Call handling
+    @objc func handleAppActivatedWithOngoingCallIfNeeded() {
+        guard let call = AppEnvironment.shared.callManager.currentCall else { return }
+        if let callVC = CurrentAppContext().frontmostViewController() as? CallVC, callVC.call == call { return }
+        guard let presentingVC = CurrentAppContext().frontmostViewController() else { preconditionFailure() } // TODO: Handle more gracefully
+        let callVC = CallVC(for: call)
+        if let conversationVC = presentingVC as? ConversationVC, let contactThread = conversationVC.thread as? TSContactThread, contactThread.contactSessionID() == call.sessionID {
+            callVC.conversationVC = conversationVC
+            conversationVC.inputAccessoryView?.isHidden = true
+            conversationVC.inputAccessoryView?.alpha = 0
+        }
+        presentingVC.present(callVC, animated: true, completion: nil)
+        
+    }
+    
     @objc func setUpCallHandling() {
         // Pre offer messages
         MessageReceiver.handlePreOfferCallMessage = { message in

Session/Notifications/PushRegistrationManager.swift

@@ -243,6 +243,10 @@ public enum PushRegistrationError: Error {
         if let uuid = payload["uuid"] as? String, let caller = payload["caller"] as? String, let timestamp = payload["timestamp"] as? UInt64 {
             let call = SessionCall(for: caller, uuid: uuid, mode: .answer)
             call.callMessageTimestamp = timestamp
+            let appDelegate = UIApplication.shared.delegate as! AppDelegate
+            appDelegate.startPollerIfNeeded()
+            appDelegate.startClosedGroupPoller()
+            appDelegate.startOpenGroupPollersIfNeeded()
             call.reportIncomingCallIfNeeded { error in
                 if let error = error {
                     SNLog("[Calls] Failed to report incoming call to CallKit due to error: \(error)")