VPN: An ErrorPresenter class to consolidate showing of error alerts

Signed-off-by: Roopesh Chander <roop@roopc.net>
2018-11-01 11:45:44 +05:30
parent 92d3de1b0d
commit bd1820e9f5
2 changed files with 51 additions and 1 deletions
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2018 WireGuard LLC. All Rights Reserved.
+
+import UIKit
+import os.log
+
+class ErrorPresenter {
+    static func errorMessage(for error: Error) -> (String, String)? {
+        switch (error) {
+        case TunnelManagementError.tunnelAlreadyExistsWithThatName:
+            return ("Name already in use", "A tunnel with that name already exists. Please pick a different name.")
+        case TunnelManagementError.vpnSystemErrorOnAddTunnel:
+            return ("Could not create tunnel", "Internal error")
+        case TunnelManagementError.vpnSystemErrorOnModifyTunnel:
+            return ("Could not modify tunnel", "Internal error")
+        case TunnelManagementError.vpnSystemErrorOnRemoveTunnel:
+            return ("Could not remove tunnel", "Internal error")
+        default:
+            os_log("ErrorPresenter: Error not presented: %{public}@", log: OSLog.default, type: .error, "\(error)")
+            return nil
+        }
+    }
+
+    static func showErrorAlert(error: Error, from sourceVC: UIViewController?, onDismissal: (() -> Void)? = nil) {
+        guard let sourceVC = sourceVC else { return }
+        guard let (title, message) = ErrorPresenter.errorMessage(for: error) else { return }
+        let okAction = UIAlertAction(title: "Ok", style: .default) { (_) in
+            onDismissal?()
+        }
+        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
+        alert.addAction(okAction)
+
+        sourceVC.present(alert, animated: true)
+    }
+
+    static func showErrorAlert(title: String, message: String, from sourceVC: UIViewController?, onDismissal: (() -> Void)? = nil) {
+        guard let sourceVC = sourceVC else { return }
+        let okAction = UIAlertAction(title: "Ok", style: .default) { (_) in
+            onDismissal?()
+        }
+        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
+        alert.addAction(okAction)
+
+        sourceVC.present(alert, animated: true)
+    }
+}