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//
// WireguardKeysViewController.swift
// MullvadVPN
//
// Created by pronebird on 04/12/2019.
// Copyright © 2019 Mullvad VPN AB. All rights reserved.
//
import Combine
import Foundation
import UIKit
import os
/// A UI refresh interval for the public key creation date (in seconds)
private let kCreationDateRefreshInterval = TimeInterval(60)
private enum WireguardKeysViewState {
case `default`
case verifyingKey
case verifiedKey(Bool)
case regeneratingKey
}
enum VerifyWireguardPublicKeyError {
case network(MullvadAPI.Error)
case server(MullvadAPI.ResponseError)
}
extension VerifyWireguardPublicKeyError: LocalizedError {
var errorDescription: String? {
return NSLocalizedString("Cannot verify the public key", comment: "")
}
var failureReason: String? {
switch self {
case .network(.network(let urlError)):
return urlError.localizedDescription
case .server(let serverError):
return serverError.errorDescription
default:
return NSLocalizedString("Internal error", comment: "")
}
}
}
class WireguardKeysViewController: UIViewController {
@IBOutlet var publicKeyLabel: UILabel!
@IBOutlet var creationDateLabel: UILabel!
@IBOutlet var regenerateKeyButton: UIButton!
@IBOutlet var verifyKeyButton: UIButton!
@IBOutlet var wireguardKeyStatusView: WireguardKeyStatusView!
private var fetchKeySubscriber: AnyCancellable?
private var verifyKeySubscriber: AnyCancellable?
private var regenerateKeySubscriber: AnyCancellable?
private var timerSubscriber: AnyCancellable?
private let apiClient = MullvadAPI()
private var publicKey: WireguardPublicKey?
private var state: WireguardKeysViewState = .default {
didSet {
updateViewState(state)
}
}
private lazy var relativeFormatter: DateComponentsFormatter = {
let formatter = DateComponentsFormatter()
formatter.unitsStyle = .full
formatter.allowedUnits = [.minute, .hour, .day, .month, .year]
formatter.maximumUnitCount = 1
return formatter
}()
override func viewDidLoad() {
super.viewDidLoad()
// Reset Storyboard placeholders
publicKeyLabel.text = "-"
creationDateLabel.text = "-"
timerSubscriber = Timer.publish(every: kCreationDateRefreshInterval, on: .main, in: .common)
.autoconnect()
.sink { [weak self] _ in
guard let self = self else { return }
if let creationDate = self.publicKey?.creationDate {
self.updateCreationDateLabel(with: creationDate)
}
}
loadPublicKey()
}
// MARK: - IBActions
@IBAction func handleRegenerateKey(_ sender: Any) {
regeneratePrivateKey()
}
@IBAction func handleVerifyKey(_ sender: Any) {
guard let accountToken = Account.shared.token,
let publicKey = publicKey else { return }
verifyKey(accountToken: accountToken, publicKey: publicKey)
}
@IBAction func handleManageKeys(_ sender: Any) {
UIApplication.shared.open(WebLinks.manageKeysURL, options: [:])
}
// MARK: - Private
private func formatKeyGenerationElapsedTime(with creationDate: Date) -> String? {
let elapsedTime = Date().timeIntervalSince(creationDate)
if elapsedTime >= 60 {
if let formattedInterval = relativeFormatter.string(from: elapsedTime) {
return String.localizedStringWithFormat(
NSLocalizedString("%@ ago", comment: ""),
formattedInterval)
} else {
return nil
}
} else {
return NSLocalizedString("Less than a minute ago", comment: "")
}
}
private func updateCreationDateLabel(with creationDate: Date) {
creationDateLabel.text = formatKeyGenerationElapsedTime(with: creationDate) ?? "-"
}
private func loadPublicKey() {
fetchKeySubscriber = TunnelManager.shared.getWireguardPublicKey()
.receive(on: DispatchQueue.main)
.sink(receiveCompletion: { (completion) in
switch completion {
case .finished:
break
case .failure(let error):
os_log(.error, "Failed to receive the public key for Wireguard: %{public}s",
error.localizedDescription)
self.presentError(error, preferredStyle: .alert)
}
}) { [weak self] (publicKey) in
guard let self = self else { return }
self.publicKeyLabel.text = publicKey.rawRepresentation.base64EncodedString()
self.updateCreationDateLabel(with: publicKey.creationDate)
self.publicKey = publicKey
}
}
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(accountToken: String, publicKey: WireguardPublicKey) {
verifyKeySubscriber = apiClient.checkWireguardKey(
accountToken: accountToken,
publicKey: publicKey.rawRepresentation
)
.retry(1)
.receive(on: DispatchQueue.main)
.mapError { VerifyWireguardPublicKeyError.network($0) }
.flatMap({ (response) in
response.result
.mapError { VerifyWireguardPublicKeyError.server($0) }
.publisher
})
.handleEvents(receiveSubscription: { _ in
self.updateViewState(.verifyingKey)
})
.sink(receiveCompletion: { (completion) in
switch completion {
case .finished:
break
case .failure(let error):
self.presentError(error, preferredStyle: .alert)
self.updateViewState(.default)
}
}) { (isValid) in
self.updateViewState(.verifiedKey(isValid))
}
}
private func regeneratePrivateKey() {
regenerateKeySubscriber = TunnelManager.shared.regeneratePrivateKey()
.receive(on: DispatchQueue.main)
.handleEvents(receiveSubscription: { (_) in
self.updateViewState(.regeneratingKey)
}, receiveCompletion: { (completion) in
self.updateViewState(.default)
})
.sink { (completion) in
switch completion {
case .finished:
self.loadPublicKey()
case .failure(let error):
os_log(.error, "Failed to re-generate the private key: %{public}s",
error.errorDescription ?? "")
self.presentError(error, preferredStyle: .alert)
}
}
}
}
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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