Fire a pixel when removing the VPN configuration (#3014)

Task/Issue URL: https://app.asana.com/0/414235014887631/1207698850203829/f
Tech Design URL:
CC:

Description:

This PR adds a pixel that reports when the VPN configuration has been removed, and why.

Author: samsymons

Core/PixelEvent.swift

@@ -416,6 +416,9 @@ extension Pixel {
         case networkProtectionDNSUpdateCustom
         case networkProtectionDNSUpdateDefault
 
+        case networkProtectionVPNConfigurationRemoved
+        case networkProtectionVPNConfigurationRemovalFailed
+
         // MARK: remote messaging pixels
 
         case remoteMessageShown
@@ -1102,6 +1105,9 @@ extension Pixel.Event {
         case .networkProtectionDNSUpdateCustom: return "m_netp_ev_update_dns_custom"
         case .networkProtectionDNSUpdateDefault: return "m_netp_ev_update_dns_default"
 
+        case .networkProtectionVPNConfigurationRemoved: return "m_netp_vpn_configuration_removed"
+        case .networkProtectionVPNConfigurationRemovalFailed: return "m_netp_vpn_configuration_removal_failed"
+
             // MARK: remote messaging pixels
 
         case .remoteMessageShown: return "m_remote_message_shown"

DuckDuckGo/AppDelegate.swift

@@ -512,15 +512,14 @@ import WebKit
 #if NETWORK_PROTECTION
         widgetRefreshModel.refreshVPNWidget()
 
-        stopTunnelAndShowThankYouMessagingIfNeeded()
-
         if tunnelDefaults.showEntitlementAlert {
             presentExpiredEntitlementAlert()
         }
 
         presentExpiredEntitlementNotificationIfNeeded()
 
         Task {
+            await stopAndRemoveVPNIfNotAuthenticated()
             await refreshShortcuts()
             await vpnWorkaround.installRedditSessionWorkaround()
         }
@@ -536,25 +535,14 @@ import WebKit
         importPasswordsStatusHandler.checkSyncSuccessStatus()
     }
 
-    private func stopTunnelAndShowThankYouMessagingIfNeeded() {
-        if accountManager.isUserAuthenticated {
-            return
-        }
-
-        if AppDependencyProvider.shared.vpnFeatureVisibility.isPrivacyProLaunched() && !accountManager.isUserAuthenticated {
-            Task {
-                await self.stopAndRemoveVPN(with: "subscription-check")
-            }
-        }
-    }
-
-    private func stopAndRemoveVPN(with reason: String) async {
-        guard await AppDependencyProvider.shared.networkProtectionTunnelController.isInstalled else {
+    private func stopAndRemoveVPNIfNotAuthenticated() async {
+        // Only remove the VPN if the user is not authenticated, and it's installed:
+        guard !accountManager.isUserAuthenticated, await AppDependencyProvider.shared.networkProtectionTunnelController.isInstalled else {
             return
         }
 
         await AppDependencyProvider.shared.networkProtectionTunnelController.stop()
-        await AppDependencyProvider.shared.networkProtectionTunnelController.removeVPN()
+        await AppDependencyProvider.shared.networkProtectionTunnelController.removeVPN(reason: .didBecomeActiveCheck)
     }
 
     func applicationWillResignActive(_ application: UIApplication) {

DuckDuckGo/MainViewController.swift

@@ -1503,15 +1503,15 @@ class MainViewController: UIViewController {
             }
 
             await networkProtectionTunnelController.stop()
-            await networkProtectionTunnelController.removeVPN()
+            await networkProtectionTunnelController.removeVPN(reason: .entitlementCheck)
         }
     }
 
     @objc
     private func onNetworkProtectionAccountSignOut(_ notification: Notification) {
         Task {
             await networkProtectionTunnelController.stop()
-            await networkProtectionTunnelController.removeVPN()
+            await networkProtectionTunnelController.removeVPN(reason: .signedOut)
         }
     }
 #endif

DuckDuckGo/NetworkProtectionDebugViewController.swift

@@ -700,7 +700,7 @@ shouldShowVPNShortcut: \(vpnVisibility.shouldShowVPNShortcut() ? "YES" : "NO")
     private func deleteVPNConfiguration() {
         Task {
             await AppDependencyProvider.shared.networkProtectionTunnelController.stop()
-            await AppDependencyProvider.shared.networkProtectionTunnelController.removeVPN()
+            await AppDependencyProvider.shared.networkProtectionTunnelController.removeVPN(reason: .debugMenu)
         }
     }
 }

DuckDuckGo/NetworkProtectionTunnelController.swift

@@ -26,6 +26,13 @@ import NetworkExtension
 import NetworkProtection
 import Subscription
 
+enum VPNConfigurationRemovalReason: String {
+    case didBecomeActiveCheck
+    case entitlementCheck
+    case signedOut
+    case debugMenu
+}
+
 final class NetworkProtectionTunnelController: TunnelController {
     static var shouldSimulateFailure: Bool = false
 
@@ -114,8 +121,18 @@ final class NetworkProtectionTunnelController: TunnelController {
         tunnelManager.connection.stopVPNTunnel()
     }
 
-    func removeVPN() async {
-        try? await tunnelManager?.removeFromPreferences()
+    func removeVPN(reason: VPNConfigurationRemovalReason) async {
+        do {
+            try await tunnelManager?.removeFromPreferences()
+
+            DailyPixel.fireDailyAndCount(pixel: .networkProtectionVPNConfigurationRemoved, withAdditionalParameters: [
+                PixelParameters.reason: reason.rawValue
+            ])
+        } catch {
+            DailyPixel.fireDailyAndCount(pixel: .networkProtectionVPNConfigurationRemovalFailed, error: error, withAdditionalParameters: [
+                PixelParameters.reason: reason.rawValue
+            ])
+        }
     }
 
     // MARK: - Connection Status Querying