WIP: notification for voip call

Session/Calls/Call Management/SessionCall.swift

@@ -96,7 +96,7 @@ public final class SessionCall: NSObject {
     }
     
     func reportIncomingCallIfNeeded() {
-        guard case .offer = mode else { return }
+        guard case .answer(_) = mode else { return }
         AppEnvironment.shared.callManager.reportIncomingCall(self, callerName: contactName) { error in
             if let error = error {
                 SNLog("[Calls] Failed to report incoming call to CallKit due to error: \(error)")

Session/Meta/Session-Info.plist

@@ -123,6 +123,7 @@
 		<string>audio</string>
 		<string>fetch</string>
 		<string>remote-notification</string>
+		<string>voip</string>
 	</array>
 	<key>UILaunchStoryboardName</key>
 	<string>Launch Screen</string>

Session/Notifications/PushRegistrationManager.swift

@@ -234,6 +234,12 @@ public enum PushRegistrationError: Error {
 
         voipTokenResolver.fulfill(pushCredentials.token)
     }
+    
+    public func pushRegistry(_ registry: PKPushRegistry, didReceiveIncomingPushWith payload: PKPushPayload, for type: PKPushType) {
+        owsAssertDebug(CurrentAppContext().isMainApp)
+        owsAssertDebug(type == .voIP)
+        Vibration.shared.startVibration()
+    }
 }
 
 // We transmit pushToken data as hex encoded string to the server

SessionNotificationServiceExtension/NotificationServiceExtension.swift

@@ -2,6 +2,7 @@ import UserNotifications
 import BackgroundTasks
 import SessionMessagingKit
 import SignalUtilitiesKit
+import CallKit
 
 public final class NotificationServiceExtension : UNNotificationServiceExtension {
     private var didPerformSetup = false
@@ -95,7 +96,7 @@ public final class NotificationServiceExtension : UNNotificationServiceExtension
                         notificationContent.badge = 1
                         notificationContent.title = "Session"
                         notificationContent.body = "\(senderDisplayName) is calling..."
-                        return self.handleSuccessForIncomingCall(for: notificationContent)
+                        return self.handleSuccessForIncomingCall(for: notificationContent, callID: callMessage.uuid!)
                     default: return self.completeSilenty()
                     }
                     if (senderPublicKey == userPublicKey) {
@@ -215,9 +216,18 @@ public final class NotificationServiceExtension : UNNotificationServiceExtension
         contentHandler!(.init())
     }
     
-    private func handleSuccessForIncomingCall(for content: UNMutableNotificationContent) {
+    private func handleSuccessForIncomingCall(for content: UNMutableNotificationContent, callID: String) {
         // TODO: poll for the real offer, play incoming call ring
-        contentHandler!(content)
+        if #available(iOSApplicationExtension 14.5, *) {
+            CXProvider.reportNewIncomingVoIPPushPayload(["uuid": callID]) { error in
+                if let error = error {
+                    owsFailDebug("Failed to notify main app of call message: \(error)")
+                } else {
+                    Logger.info("Successfully notified main app of call message.")
+                }
+                self.contentHandler!(content)
+            }
+        }
     }
 
     private func handleSuccess(for content: UNMutableNotificationContent) {