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// SPDX-License-Identifier: MIT
// Copyright © 2018 WireGuard LLC. All Rights Reserved.
import UIKit
protocol TunnelEditTableViewControllerDelegate: class {
func tunnelSaved(tunnel: TunnelContainer)
func tunnelEditingCancelled()
}
// MARK: TunnelEditTableViewController
class TunnelEditTableViewController: UITableViewController {
weak var delegate: TunnelEditTableViewControllerDelegate? = nil
let interfaceFieldsBySection: [[TunnelViewModel.InterfaceField]] = [
[.name],
[.privateKey, .publicKey, .generateKeyPair],
[.addresses, .listenPort, .mtu, .dns]
]
let peerFields: [TunnelViewModel.PeerField] = [
.publicKey, .preSharedKey, .endpoint,
.allowedIPs, .excludePrivateIPs, .persistentKeepAlive,
.deletePeer
]
let tunnelsManager: TunnelsManager
let tunnel: TunnelContainer?
let tunnelViewModel: TunnelViewModel
init(tunnelsManager tm: TunnelsManager, tunnel t: TunnelContainer) {
// Use this initializer to edit an existing tunnel.
tunnelsManager = tm
tunnel = t
tunnelViewModel = TunnelViewModel(tunnelConfiguration: t.tunnelConfiguration())
super.init(style: .grouped)
}
init(tunnelsManager tm: TunnelsManager, tunnelConfiguration: TunnelConfiguration?) {
// Use this initializer to create a new tunnel.
// If tunnelConfiguration is passed, data will be prepopulated from that configuration.
tunnelsManager = tm
tunnel = nil
tunnelViewModel = TunnelViewModel(tunnelConfiguration: tunnelConfiguration)
super.init(style: .grouped)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
self.title = (tunnel == nil) ? "New configuration" : "Edit configuration"
self.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .save, target: self, action: #selector(saveTapped))
self.navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(cancelTapped))
self.tableView.rowHeight = 44
self.tableView.allowsSelection = false
self.tableView.register(TunnelEditTableViewKeyValueCell.self, forCellReuseIdentifier: TunnelEditTableViewKeyValueCell.id)
self.tableView.register(TunnelEditTableViewButtonCell.self, forCellReuseIdentifier: TunnelEditTableViewButtonCell.id)
self.tableView.register(TunnelEditTableViewSwitchCell.self, forCellReuseIdentifier: TunnelEditTableViewSwitchCell.id)
}
@objc func saveTapped() {
self.tableView.endEditing(false)
let tunnelSaveResult = tunnelViewModel.save()
switch (tunnelSaveResult) {
case .error(let errorMessage):
let erroringConfiguration = (tunnelViewModel.interfaceData.validatedConfiguration == nil) ? "Interface" : "Peer"
showErrorAlert(title: "Invalid \(erroringConfiguration)", message: errorMessage)
case .saved(let tunnelConfiguration):
if let tunnel = tunnel {
// We're modifying an existing tunnel
tunnelsManager.modify(tunnel: tunnel, with: tunnelConfiguration) { [weak self] (error) in
if let error = error {
print("Could not modify tunnel: \(error)")
self?.showErrorAlert(title: "Could not save", message: "Internal error")
} else {
self?.dismiss(animated: true, completion: nil)
self?.delegate?.tunnelSaved(tunnel: tunnel)
}
}
} else {
// We're adding a new tunnel
tunnelsManager.add(tunnelConfiguration: tunnelConfiguration) { [weak self] (tunnel, error) in
if let error = error {
print("Could not add tunnel: \(error)")
self?.showErrorAlert(title: "Could not save", message: "Internal error")
} else {
self?.dismiss(animated: true, completion: nil)
if let tunnel = tunnel {
self?.delegate?.tunnelSaved(tunnel: tunnel)
}
}
}
}
}
}
@objc func cancelTapped() {
dismiss(animated: true, completion: nil)
self.delegate?.tunnelEditingCancelled()
}
func showErrorAlert(title: String, message: String) {
let okAction = UIAlertAction(title: "Ok", style: .default)
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
alert.addAction(okAction)
self.present(alert, animated: true, completion: nil)
}
}
// MARK: UITableViewDataSource
extension TunnelEditTableViewController {
override func numberOfSections(in tableView: UITableView) -> Int {
let numberOfInterfaceSections = interfaceFieldsBySection.count
let numberOfPeerSections = tunnelViewModel.peersData.count
return numberOfInterfaceSections + numberOfPeerSections + 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let numberOfInterfaceSections = interfaceFieldsBySection.count
let numberOfPeerSections = tunnelViewModel.peersData.count
if (section < numberOfInterfaceSections) {
// Interface
return interfaceFieldsBySection[section].count
} else if ((numberOfPeerSections > 0) && (section < (numberOfInterfaceSections + numberOfPeerSections))) {
// Peer
return peerFields.count
} else {
// Add peer
return 1
}
}
override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
let numberOfInterfaceSections = interfaceFieldsBySection.count
let numberOfPeerSections = tunnelViewModel.peersData.count
if (section < numberOfInterfaceSections) {
// Interface
return (section == 0) ? "Interface" : nil
} else if ((numberOfPeerSections > 0) && (section < (numberOfInterfaceSections + numberOfPeerSections))) {
// Peer
return "Peer"
} else {
// Add peer
return nil
}
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let numberOfInterfaceSections = interfaceFieldsBySection.count
let numberOfPeerSections = tunnelViewModel.peersData.count
let section = indexPath.section
let row = indexPath.row
if (section < numberOfInterfaceSections) {
// Interface
let interfaceData = tunnelViewModel.interfaceData
let field = interfaceFieldsBySection[section][row]
if (field == .generateKeyPair) {
let cell = tableView.dequeueReusableCell(withIdentifier: TunnelEditTableViewButtonCell.id, for: indexPath) as! TunnelEditTableViewButtonCell
cell.buttonText = field.rawValue
cell.onTapped = { [weak self, weak interfaceData] in
if let interfaceData = interfaceData, let s = self {
interfaceData[.privateKey] = Curve25519.generatePrivateKey().base64EncodedString()
if let privateKeyRow = s.interfaceFieldsBySection[section].firstIndex(of: .privateKey),
let publicKeyRow = s.interfaceFieldsBySection[section].firstIndex(of: .publicKey) {
let privateKeyIndex = IndexPath(row: privateKeyRow, section: section)
let publicKeyIndex = IndexPath(row: publicKeyRow, section: section)
s.tableView.reloadRows(at: [privateKeyIndex, publicKeyIndex], with: .automatic)
}
}
}
return cell
} else {
let cell = tableView.dequeueReusableCell(withIdentifier: TunnelEditTableViewKeyValueCell.id, for: indexPath) as! TunnelEditTableViewKeyValueCell
// Set key
cell.key = field.rawValue
// Set placeholder text
if (field == .name || field == .privateKey) {
cell.placeholderText = "Required"
} else if (field == .mtu) {
cell.placeholderText = "Automatic"
}
// Set editable
if (field == .publicKey) {
cell.isValueEditable = false
}
// Set keyboardType
if (field == .mtu || field == .listenPort) {
cell.keyboardType = .numberPad
} else if (field == .addresses || field == .dns) {
cell.keyboardType = .numbersAndPunctuation
}
// Bind values to view model
cell.value = interfaceData[field]
if (field == .dns) { // While editing DNS, you might directly set exclude private IPs
cell.onValueBeingEdited = { [weak interfaceData] value in
interfaceData?[field] = value
}
} else {
cell.onValueChanged = { [weak interfaceData] value in
interfaceData?[field] = value
}
}
// Compute public key live
if (field == .privateKey) {
cell.onValueBeingEdited = { [weak self, weak interfaceData] value in
if let interfaceData = interfaceData, let s = self {
interfaceData[.privateKey] = value
if let row = s.interfaceFieldsBySection[section].firstIndex(of: .publicKey) {
s.tableView.reloadRows(at: [IndexPath(row: row, section: section)], with: .none)
}
}
}
}
return cell
}
} else if ((numberOfPeerSections > 0) && (section < (numberOfInterfaceSections + numberOfPeerSections))) {
// Peer
let peerIndex = (section - numberOfInterfaceSections)
let peerData = tunnelViewModel.peersData[peerIndex]
let field = peerFields[row]
if (field == .deletePeer) {
let cell = tableView.dequeueReusableCell(withIdentifier: TunnelEditTableViewButtonCell.id, for: indexPath) as! TunnelEditTableViewButtonCell
cell.buttonText = field.rawValue
cell.onTapped = { [weak self, weak peerData] in
guard let peerData = peerData else { return }
guard let s = self else { return }
s.showConfirmationAlert(message: "Delete this peer?",
buttonTitle: "Delete", from: cell,
onConfirmed: { [weak s] in
guard let s = s else { return }
let removedSectionIndices = s.deletePeer(peer: peerData)
s.tableView.deleteSections(removedSectionIndices, with: .automatic)
if let row = s.peerFields.firstIndex(of: .excludePrivateIPs) {
let excludePrivateIPsIndexPaths = (0 ..< s.tunnelViewModel.peersData.count).map {
IndexPath(row: row, section: numberOfInterfaceSections + $0)
}
s.tableView.reloadRows(at: excludePrivateIPsIndexPaths, with: .none)
}
})
}
return cell
} else if (field == .excludePrivateIPs) {
let cell = tableView.dequeueReusableCell(withIdentifier: TunnelEditTableViewSwitchCell.id, for: indexPath) as! TunnelEditTableViewSwitchCell
cell.message = field.rawValue
cell.isEnabled = peerData.shouldAllowExcludePrivateIPsControl
cell.isOn = peerData.excludePrivateIPsValue
cell.onSwitchToggled = { [weak self] (isOn) in
guard let s = self else { return }
peerData.excludePrivateIPsValueChanged(isOn: isOn, dnsServers: s.tunnelViewModel.interfaceData[.dns])
if let row = s.peerFields.firstIndex(of: .allowedIPs) {
s.tableView.reloadRows(at: [IndexPath(row: row, section: section)], with: .none)
}
}
return cell
} else {
let cell = tableView.dequeueReusableCell(withIdentifier: TunnelEditTableViewKeyValueCell.id, for: indexPath) as! TunnelEditTableViewKeyValueCell
// Set key
cell.key = field.rawValue
// Set placeholder text
if (field == .publicKey) {
cell.placeholderText = "Required"
}
if (field == .persistentKeepAlive) {
cell.keyboardType = .numberPad
} else if (field == .allowedIPs) {
cell.keyboardType = .numbersAndPunctuation
}
// Bind values to view model
cell.value = peerData[field]
if (field != .allowedIPs) {
cell.onValueChanged = { [weak peerData] value in
peerData?[field] = value
}
}
// Compute state of exclude private IPs live
if (field == .allowedIPs) {
cell.onValueBeingEdited = { [weak self, weak peerData] value in
if let peerData = peerData, let s = self {
peerData[.allowedIPs] = value
if let row = s.peerFields.firstIndex(of: .excludePrivateIPs) {
s.tableView.reloadRows(at: [IndexPath(row: row, section: section)], with: .none)
}
}
}
}
return cell
}
} else {
assert(section == (numberOfInterfaceSections + numberOfPeerSections))
// Add peer
let cell = tableView.dequeueReusableCell(withIdentifier: TunnelEditTableViewButtonCell.id, for: indexPath) as! TunnelEditTableViewButtonCell
cell.buttonText = "Add peer"
cell.onTapped = { [weak self] in
guard let s = self else { return }
let addedSectionIndices = s.appendEmptyPeer()
tableView.insertSections(addedSectionIndices, with: .automatic)
if let row = s.peerFields.firstIndex(of: .excludePrivateIPs) {
let excludePrivateIPsIndexPaths = (0 ..< s.tunnelViewModel.peersData.count).map {
IndexPath(row: row, section: numberOfInterfaceSections + $0)
}
s.tableView.reloadRows(at: excludePrivateIPsIndexPaths, with: .none)
}
}
return cell
}
}
func appendEmptyPeer() -> IndexSet {
let numberOfInterfaceSections = interfaceFieldsBySection.count
tunnelViewModel.appendEmptyPeer()
let addedPeerIndex = tunnelViewModel.peersData.count - 1
let addedSectionIndices = IndexSet(integer: (numberOfInterfaceSections + addedPeerIndex))
return addedSectionIndices
}
func deletePeer(peer: TunnelViewModel.PeerData) -> IndexSet {
let numberOfInterfaceSections = interfaceFieldsBySection.count
assert(peer.index < tunnelViewModel.peersData.count)
tunnelViewModel.deletePeer(peer: peer)
let removedSectionIndices = IndexSet(integer: (numberOfInterfaceSections + peer.index))
return removedSectionIndices
}
func showConfirmationAlert(message: String, buttonTitle: String, from sourceView: UIView,
onConfirmed: @escaping (() -> Void)) {
let destroyAction = UIAlertAction(title: buttonTitle, style: .destructive) { (action) in
onConfirmed()
}
let cancelAction = UIAlertAction(title: "Cancel", style: .cancel)
let alert = UIAlertController(title: "", message: message, preferredStyle: .actionSheet)
alert.addAction(destroyAction)
alert.addAction(cancelAction)
// popoverPresentationController will be nil on iPhone and non-nil on iPad
alert.popoverPresentationController?.sourceView = sourceView
self.present(alert, animated: true, completion: nil)
}
}
class TunnelEditTableViewKeyValueCell: UITableViewCell {
static let id: String = "TunnelEditTableViewKeyValueCell"
var key: String {
get { return keyLabel.text ?? "" }
set(value) {keyLabel.text = value }
}
var value: String {
get { return valueTextField.text ?? "" }
set(value) { valueTextField.text = value }
}
var placeholderText: String {
get { return valueTextField.placeholder ?? "" }
set(value) { valueTextField.placeholder = value }
}
var isValueEditable: Bool {
get { return valueTextField.isEnabled }
set(value) {
valueTextField.isEnabled = value
keyLabel.textColor = value ? UIColor.black : UIColor.gray
valueTextField.textColor = value ? UIColor.black : UIColor.gray
}
}
var isValueValid: Bool = true {
didSet(value) {
if (value) {
keyLabel.textColor = isValueEditable ? UIColor.black : UIColor.gray
} else {
keyLabel.textColor = UIColor.red
}
}
}
var keyboardType: UIKeyboardType {
get { return valueTextField.keyboardType }
set(value) { valueTextField.keyboardType = value }
}
var onValueChanged: ((String) -> Void)? = nil
var onValueBeingEdited: ((String) -> Void)? = nil
let keyLabel: UILabel
let valueTextField: UITextField
private var textFieldValueOnBeginEditing: String = ""
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
keyLabel = UILabel()
valueTextField = UITextField()
super.init(style: style, reuseIdentifier: reuseIdentifier)
contentView.addSubview(keyLabel)
keyLabel.translatesAutoresizingMaskIntoConstraints = false
keyLabel.textAlignment = .right
let widthRatioConstraint = NSLayoutConstraint(item: keyLabel, attribute: .width,
relatedBy: .equal,
toItem: self, attribute: .width,
multiplier: 0.4, constant: 0)
// The "Persistent Keepalive" key doesn't fit into 0.4 * width on the iPhone SE,
// so set a CR priority > the 0.4-constraint's priority.
widthRatioConstraint.priority = .defaultHigh + 1
keyLabel.setContentCompressionResistancePriority(.defaultHigh + 2, for: .horizontal)
NSLayoutConstraint.activate([
keyLabel.centerYAnchor.constraint(equalTo: contentView.centerYAnchor),
keyLabel.leftAnchor.constraint(equalTo: contentView.leftAnchor, constant: 8),
widthRatioConstraint
])
contentView.addSubview(valueTextField)
valueTextField.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
valueTextField.centerYAnchor.constraint(equalTo: contentView.centerYAnchor),
valueTextField.leftAnchor.constraint(equalTo: keyLabel.rightAnchor, constant: 16),
valueTextField.rightAnchor.constraint(equalTo: contentView.rightAnchor, constant: -8),
])
valueTextField.delegate = self
valueTextField.autocapitalizationType = .none
valueTextField.autocorrectionType = .no
valueTextField.spellCheckingType = .no
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func prepareForReuse() {
super.prepareForReuse()
key = ""
value = ""
placeholderText = ""
isValueEditable = true
isValueValid = true
keyboardType = .default
onValueChanged = nil
}
}
extension TunnelEditTableViewKeyValueCell: UITextFieldDelegate {
func textFieldDidBeginEditing(_ textField: UITextField) {
textFieldValueOnBeginEditing = textField.text ?? ""
isValueValid = true
}
func textFieldDidEndEditing(_ textField: UITextField) {
let isModified = (textField.text ?? "" != textFieldValueOnBeginEditing)
guard (isModified) else { return }
if let onValueChanged = onValueChanged {
onValueChanged(textField.text ?? "")
}
}
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if let onValueBeingEdited = onValueBeingEdited {
let modifiedText = ((textField.text ?? "") as NSString).replacingCharacters(in: range, with: string)
onValueBeingEdited(modifiedText)
}
return true
}
}
class TunnelEditTableViewButtonCell: UITableViewCell {
static let id: String = "TunnelEditTableViewButtonCell"
var buttonText: String {
get { return button.title(for: .normal) ?? "" }
set(value) { button.setTitle(value, for: .normal) }
}
var onTapped: (() -> Void)? = nil
let button: UIButton
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
button = UIButton(type: .system)
super.init(style: style, reuseIdentifier: reuseIdentifier)
contentView.addSubview(button)
button.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
button.centerYAnchor.constraint(equalTo: contentView.centerYAnchor),
button.centerXAnchor.constraint(equalTo: contentView.centerXAnchor)
])
button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
}
@objc func buttonTapped() {
onTapped?()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func prepareForReuse() {
super.prepareForReuse()
buttonText = ""
onTapped = nil
}
}
class TunnelEditTableViewSwitchCell: UITableViewCell {
static let id: String = "TunnelEditTableViewSwitchCell"
var message: String {
get { return textLabel?.text ?? "" }
set(value) { textLabel!.text = value }
}
var isOn: Bool {
get { return switchView.isOn }
set(value) { switchView.isOn = value }
}
var isEnabled: Bool {
get { return switchView.isEnabled }
set(value) {
switchView.isEnabled = value
textLabel?.textColor = value ? UIColor.black : UIColor.gray
}
}
var onSwitchToggled: ((Bool) -> Void)? = nil
let switchView: UISwitch
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
switchView = UISwitch()
super.init(style: .default, reuseIdentifier: reuseIdentifier)
accessoryView = switchView
switchView.addTarget(self, action: #selector(switchToggled), for: .valueChanged)
}
@objc func switchToggled() {
onSwitchToggled?(switchView.isOn)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func prepareForReuse() {
super.prepareForReuse()
message = ""
isOn = false
}
}
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