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//
// WireguardKeysViewController.swift
// MullvadVPN
//
// Created by pronebird on 04/12/2019.
// Copyright © 2019 Mullvad VPN AB. All rights reserved.
//
import Foundation
import UIKit
import Logging
/// A UI refresh interval for the public key creation date (in seconds)
private let kCreationDateRefreshInterval = Int(60)
/// A maximum number of characters to display out of the entire public key representation
private let kDisplayPublicKeyMaxLength = 20
private enum WireguardKeysViewState {
case `default`
case verifyingKey
case verifiedKey(Bool)
case regeneratingKey
}
class WireguardKeysViewController: UIViewController, TunnelObserver {
@IBOutlet var publicKeyButton: UIButton!
@IBOutlet var creationDateLabel: UILabel!
@IBOutlet var regenerateKeyButton: UIButton!
@IBOutlet var verifyKeyButton: UIButton!
@IBOutlet var wireguardKeyStatusView: WireguardKeyStatusView!
private var publicKeyPeriodicUpdateTimer: DispatchSourceTimer?
private var copyToPasteboardWork: DispatchWorkItem?
private let alertPresenter = AlertPresenter()
private let logger = Logger(label: "WireguardKeysViewController")
private var state: WireguardKeysViewState = .default {
didSet {
updateViewState(state)
}
}
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.title = NSLocalizedString("WireGuard key", comment: "Navigation title")
TunnelManager.shared.addObserver(self)
updatePublicKeyWithMetadata(publicKeyWithMetadata: TunnelManager.shared.publicKeyWithMetadata, animated: false)
startPublicKeyPeriodicUpdate()
}
private func startPublicKeyPeriodicUpdate() {
let interval = DispatchTimeInterval.seconds(kCreationDateRefreshInterval)
let timerSource = DispatchSource.makeTimerSource(queue: .main)
timerSource.setEventHandler { [weak self] () -> Void in
let metadata = TunnelManager.shared.publicKeyWithMetadata
self?.updatePublicKeyWithMetadata(publicKeyWithMetadata: metadata, animated: true)
}
timerSource.schedule(deadline: .now() + interval, repeating: interval)
timerSource.activate()
self.publicKeyPeriodicUpdateTimer = timerSource
}
// MARK: - TunnelObserver
func tunnelStateDidChange(tunnelState: TunnelState) {
// no-op
}
func tunnelPublicKeyDidChange(publicKeyWithMetadata: PublicKeyWithMetadata?) {
DispatchQueue.main.async {
self.updatePublicKeyWithMetadata(publicKeyWithMetadata: publicKeyWithMetadata, animated: true)
}
}
// MARK: - IBActions
@IBAction func copyPublicKey(_ sender: Any) {
guard let metadata = TunnelManager.shared.publicKeyWithMetadata else { return }
UIPasteboard.general.string = metadata.stringRepresentation()
setPublicKeyTitle(
string: NSLocalizedString("COPIED TO PASTEBOARD!", comment: ""),
animated: true)
let dispatchWork = DispatchWorkItem { [weak self] in
let metadata = TunnelManager.shared.publicKeyWithMetadata
self?.updatePublicKeyWithMetadata(publicKeyWithMetadata: metadata, animated: true)
}
DispatchQueue.main.asyncAfter(wallDeadline: .now() + .seconds(3), execute: dispatchWork)
self.copyToPasteboardWork?.cancel()
self.copyToPasteboardWork = dispatchWork
}
@IBAction func handleRegenerateKey(_ sender: Any) {
regeneratePrivateKey()
}
@IBAction func handleVerifyKey(_ sender: Any) {
verifyKey()
}
// MARK: - Private
private func formatKeyGenerationElapsedTime(with creationDate: Date) -> String? {
return CustomDateComponentsFormatting.localizedString(
from: creationDate,
to: Date(),
unitsStyle: .full
).map { (formattedInterval) -> String in
return String(format: NSLocalizedString("%@ ago", comment: ""), formattedInterval)
}
}
private func updateCreationDateLabel(with creationDate: Date) {
creationDateLabel.text = formatKeyGenerationElapsedTime(with: creationDate) ?? "-"
}
private func updatePublicKeyWithMetadata(publicKeyWithMetadata: PublicKeyWithMetadata?, animated: Bool) {
if let publicKey = publicKeyWithMetadata {
let displayKey = publicKey
.stringRepresentation(maxLength: kDisplayPublicKeyMaxLength)
setPublicKeyTitle(string: displayKey, animated: animated)
updateCreationDateLabel(with: publicKey.creationDate)
} else {
setPublicKeyTitle(string: "-", animated: animated)
creationDateLabel.text = "-"
}
}
private func updateViewState(_ state: WireguardKeysViewState) {
switch state {
case .default:
setKeyActionButtonsEnabled(true)
wireguardKeyStatusView.status = .default
case .verifyingKey:
setKeyActionButtonsEnabled(false)
wireguardKeyStatusView.status = .verifying
case .verifiedKey(let isValid):
setKeyActionButtonsEnabled(true)
wireguardKeyStatusView.status = .verified(isValid)
case .regeneratingKey:
setKeyActionButtonsEnabled(false)
wireguardKeyStatusView.status = .verifying
}
}
private func setKeyActionButtonsEnabled(_ enabled: Bool) {
regenerateKeyButton.isEnabled = enabled
verifyKeyButton.isEnabled = enabled
}
private func verifyKey() {
self.updateViewState(.verifyingKey)
TunnelManager.shared.verifyPublicKey { (result) in
DispatchQueue.main.async {
switch result {
case .success(let isValid):
self.updateViewState(.verifiedKey(isValid))
case .failure(let error):
let alertController = UIAlertController(
title: NSLocalizedString("Cannot verify the key", comment: ""),
message: error.errorChainDescription,
preferredStyle: .alert
)
alertController.addAction(
UIAlertAction(title: NSLocalizedString("OK", comment: ""), style: .cancel)
)
self.alertPresenter.enqueue(alertController, presentingController: self)
self.updateViewState(.default)
}
}
}
}
private func regeneratePrivateKey() {
self.updateViewState(.regeneratingKey)
TunnelManager.shared.regeneratePrivateKey { (result) in
DispatchQueue.main.async {
switch result {
case .success:
break
case .failure(let error):
let alertController = UIAlertController(
title: NSLocalizedString("Cannot regenerate the key", comment: ""),
message: error.errorChainDescription,
preferredStyle: .alert
)
alertController.addAction(
UIAlertAction(title: NSLocalizedString("OK", comment: ""), style: .cancel)
)
self.logger.error(chainedError: error, message: "Failed to regenerate the private key")
self.alertPresenter.enqueue(alertController, presentingController: self)
}
self.updateViewState(.default)
}
}
}
private func setPublicKeyTitle(string: String, animated: Bool) {
let updateTitle = {
self.publicKeyButton.setTitle(string, for: .normal)
}
if animated {
updateTitle()
} else {
UIView.performWithoutAnimation {
updateTitle()
publicKeyButton.layoutIfNeeded()
}
}
}
}
class WireguardKeyStatusView: UIView {
enum Status {
case `default`, verifying, verified(Bool)
}
@IBOutlet var textLabel: UILabel!
@IBOutlet var activityIndicator: SpinnerActivityIndicatorView!
var status: Status = .default {
didSet {
updateView()
}
}
override func awakeFromNib() {
super.awakeFromNib()
updateView()
}
private func updateView() {
switch status {
case .default:
textLabel.isHidden = true
activityIndicator.stopAnimating()
case .verifying:
textLabel.isHidden = true
activityIndicator.startAnimating()
case .verified(let isValid):
textLabel.isHidden = false
activityIndicator.stopAnimating()
if isValid {
textLabel.textColor = .successColor
textLabel.text = NSLocalizedString("Key is valid", comment: "")
} else {
textLabel.textColor = .dangerColor
textLabel.text = NSLocalizedString("Key is invalid", comment: "")
}
}
}
}
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