show modal of ip exposure for calls

Session/Calls/CallVC.swift

@@ -320,7 +320,18 @@ final class CallVC : UIViewController, WebRTCSessionDelegate, VideoPreviewDelega
         }
     }
     
+    internal func showCallModal() {
+        let callModal = CallModal() { [weak self] in
+            self?.answerCall()
+        }
+        callModal.modalPresentationStyle = .overFullScreen
+        callModal.modalTransitionStyle = .crossDissolve
+        present(callModal, animated: true, completion: nil)
+    }
+    
     @objc private func answerCall() {
+        let userDefaults = UserDefaults.standard
+        if userDefaults[.hasSeenCallIPExposureWarning] {
             if case let .answer(sdp) = mode {
                 callInfoLabel.text = "Connecting..."
                 webRTCSession.handleRemoteSDP(sdp, from: sessionID) // This sends an answer message internally
@@ -329,6 +340,10 @@ final class CallVC : UIViewController, WebRTCSessionDelegate, VideoPreviewDelega
                     self.answerButton.isHidden = true
                 }, completion: nil)
             }
+        } else {
+            userDefaults[.hasSeenCallIPExposureWarning] = true
+            showCallModal()
+        }
     }
     
     @objc private func endCall() {

Session/Calls/Views & Modals/IncomingCallBanner.swift

@@ -140,7 +140,22 @@ final class IncomingCallBanner: UIView, UIGestureRecognizerDelegate {
     }
     
     @objc private func answerCall() {
+        let userDefaults = UserDefaults.standard
+        if userDefaults[.hasSeenCallIPExposureWarning] {
             showCallVC(answer: true)
+        } else {
+            showCallModal()
+        }
+    }
+    
+    internal func showCallModal() {
+        let callModal = CallModal() { [weak self] in
+            self?.showCallVC(answer: true)
+        }
+        callModal.modalPresentationStyle = .overFullScreen
+        callModal.modalTransitionStyle = .crossDissolve
+        guard let presentingVC = CurrentAppContext().frontmostViewController() else { preconditionFailure() } // TODO: Handle more gracefully
+        presentingVC.present(callModal, animated: true, completion: nil)
     }
     
     @objc private func endCall() {

Session/Conversations/ConversationVC+Interaction.swift

@@ -28,6 +28,8 @@ extension ConversationVC : InputViewDelegate, MessageCellDelegate, ContextMenuAc
     
     // MARK: Call
     @objc func startCall(_ sender: Any?) {
+        let userDefaults = UserDefaults.standard
+        if userDefaults[.hasSeenCallIPExposureWarning] {
             guard let contactSessionID = (thread as? TSContactThread)?.contactSessionID() else { return }
             let callVC = CallVC(for: contactSessionID, uuid: UUID().uuidString, mode: .offer)
             callVC.conversationVC = self
@@ -36,6 +38,10 @@ extension ConversationVC : InputViewDelegate, MessageCellDelegate, ContextMenuAc
             self.inputAccessoryView?.isHidden = true
             self.inputAccessoryView?.alpha = 0
             present(callVC, animated: true, completion: nil)
+        } else {
+            userDefaults[.hasSeenCallIPExposureWarning] = true
+            showCallModal()
+        }
     }
     
     internal func showCallModal() {

SessionUtilitiesKit/General/SNUserDefaults.swift

@@ -6,6 +6,7 @@ public enum SNUserDefaults {
         case hasSyncedInitialConfiguration = "hasSyncedConfiguration"
         case hasViewedSeed
         case hasSeenLinkPreviewSuggestion
+        case hasSeenCallIPExposureWarning
         case isUsingFullAPNs
     }