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// 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) {
// TunnelManagementError
case TunnelManagementError.tunnelAlreadyExistsWithThatName:
return ("Name already exists", "A tunnel with that name already exists")
case TunnelManagementError.tunnelInvalidName:
return ("Name already exists", "The tunnel name is invalid")
case TunnelManagementError.vpnSystemErrorOnAddTunnel:
return ("Unable to create tunnel", "Internal error")
case TunnelManagementError.vpnSystemErrorOnModifyTunnel:
return ("Unable to modify tunnel", "Internal error")
case TunnelManagementError.vpnSystemErrorOnRemoveTunnel:
return ("Unable to remove tunnel", "Internal error")
// TunnelActivationError
case TunnelActivationError.noEndpoint:
return ("Endpoint missing", "There must be at least one peer with an endpoint")
case TunnelActivationError.dnsResolutionFailed:
return ("DNS resolution failure", "One or more endpoint domains could not be resolved")
case TunnelActivationError.tunnelActivationFailed:
return ("Activation failure", "The tunnel could not be activated due to an internal error")
case TunnelActivationError.attemptingActivationWhenAnotherTunnelIsBusy(let otherTunnelStatus):
let statusString: String = {
switch (otherTunnelStatus) {
case .active: fallthrough
case .reasserting: fallthrough
case .restarting:
return "active"
case .activating: fallthrough
case .resolvingEndpointDomains:
return "being activated"
case .deactivating:
return "being deactivated"
case .inactive:
fatalError()
}
}()
return ("Activation failure", "Another tunnel is currently \(statusString)")
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, onPresented: (() -> 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, completion: onPresented)
}
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)
}
}
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