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//
// TunnelEditTableViewController.swift
// WireGuard
//
// Created by Roopesh Chander on 17/10/18.
// Copyright © 2018 WireGuard LLC. All rights reserved.
//
import UIKit
// MARK: TunnelEditTableViewController
class TunnelEditTableViewController: UITableViewController {
let interfaceFieldsBySection: [[TunnelViewModel.InterfaceField]] = [
[.name],
[.privateKey, .publicKey, .generateKeyPair],
[.addresses, .listenPort, .mtu, .dns]
]
let peerFieldsBySection: [[TunnelViewModel.PeerField]] = [
[.publicKey, .preSharedKey, .endpoint,
.allowedIPs, .excludePrivateIPs,
.persistentKeepAlive,
.deletePeer]
]
let tunnelsManager: TunnelsManager
let tunnelViewModel: TunnelViewModel
init(tunnelsManager tm: TunnelsManager) {
tunnelsManager = tm
tunnelViewModel = TunnelViewModel(tunnelConfiguration: nil)
super.init(style: .grouped)
self.modalPresentationStyle = .formSheet
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
self.title = "New 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(TunnelsEditTableViewKeyValueCell.self, forCellReuseIdentifier: TunnelsEditTableViewKeyValueCell.id)
self.tableView.register(TunnelsEditTableViewButtonCell.self, forCellReuseIdentifier: TunnelsEditTableViewButtonCell.id)
self.tableView.register(TunnelsEditTableViewSwitchCell.self, forCellReuseIdentifier: TunnelsEditTableViewSwitchCell.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):
tunnelsManager.add(tunnelConfiguration: tunnelConfiguration) { [weak self] (error) in
if let error = error {
print("Could not save: \(error)")
self?.showErrorAlert(title: "Could not save", message: "Internal error")
} else {
self?.dismiss(animated: true, completion: nil)
}
}
}
}
@objc func cancelTapped() {
dismiss(animated: true, completion: nil)
}
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 = peerFieldsBySection.count
let numberOfPeers = tunnelViewModel.peersData.count
return numberOfInterfaceSections + (numberOfPeers * numberOfPeerSections) + 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let numberOfInterfaceSections = interfaceFieldsBySection.count
let numberOfPeerSections = peerFieldsBySection.count
let numberOfPeers = tunnelViewModel.peersData.count
if (section < numberOfInterfaceSections) {
// Interface
return interfaceFieldsBySection[section].count
} else if ((numberOfPeers > 0) && (section < (numberOfInterfaceSections + numberOfPeers * numberOfPeerSections))) {
// Peer
let fieldIndex = (section - numberOfInterfaceSections) % numberOfPeerSections
return peerFieldsBySection[fieldIndex].count
} else {
// Add peer
return 1
}
}
override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
let numberOfInterfaceSections = interfaceFieldsBySection.count
let numberOfPeerSections = peerFieldsBySection.count
let numberOfPeers = tunnelViewModel.peersData.count
if (section < numberOfInterfaceSections) {
// Interface
return (section == 0) ? "Interface" : nil
} else if ((numberOfPeers > 0) && (section < (numberOfInterfaceSections + numberOfPeers * numberOfPeerSections))) {
// Peer
let fieldIndex = (section - numberOfInterfaceSections) % numberOfPeerSections
return (fieldIndex == 0) ? "Peer" : nil
} else {
// Add peer
return nil
}
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let numberOfInterfaceSections = interfaceFieldsBySection.count
let numberOfPeerSections = peerFieldsBySection.count
let numberOfPeers = 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: TunnelsEditTableViewButtonCell.id, for: indexPath) as! TunnelsEditTableViewButtonCell
cell.buttonText = field.rawValue
cell.onTapped = {
print("Generating keypair is unimplemented") // TODO
}
return cell
} else {
let cell = tableView.dequeueReusableCell(withIdentifier: TunnelsEditTableViewKeyValueCell.id, for: indexPath) as! TunnelsEditTableViewKeyValueCell
// Set key
cell.key = field.rawValue
// Set placeholder text
if (field == .name || field == .privateKey) {
cell.placeholderText = "Required"
} else if (field == .mtu) {
cell.placeholderText = "Automatic"
}
// Bind values to view model
cell.value = interfaceData[field]
cell.onValueChanged = { [weak interfaceData] value in
interfaceData?[field] = value
}
return cell
}
} else if ((numberOfPeers > 0) && (section < (numberOfInterfaceSections + numberOfPeers * numberOfPeerSections))) {
// Peer
let peerIndex = Int((section - numberOfInterfaceSections) / numberOfPeerSections)
let peerSectionIndex = (section - numberOfInterfaceSections) % numberOfPeerSections
let peerData = tunnelViewModel.peersData[peerIndex]
let field = peerFieldsBySection[peerSectionIndex][row]
if (field == .deletePeer) {
let cell = tableView.dequeueReusableCell(withIdentifier: TunnelsEditTableViewButtonCell.id, for: indexPath) as! TunnelsEditTableViewButtonCell
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)
})
}
return cell
} else if (field == .excludePrivateIPs) {
let cell = tableView.dequeueReusableCell(withIdentifier: TunnelsEditTableViewSwitchCell.id, for: indexPath) as! TunnelsEditTableViewSwitchCell
cell.message = field.rawValue
return cell
} else {
let cell = tableView.dequeueReusableCell(withIdentifier: TunnelsEditTableViewKeyValueCell.id, for: indexPath) as! TunnelsEditTableViewKeyValueCell
// Set key
cell.key = field.rawValue
// Set placeholder text
if (field == .publicKey) {
cell.placeholderText = "Required"
}
// Bind values to view model
cell.value = peerData[field]
cell.onValueChanged = { [weak peerData] value in
peerData?[field] = value
}
return cell
}
} else {
assert(section == (numberOfInterfaceSections + numberOfPeers * numberOfPeerSections))
// Add peer
let cell = tableView.dequeueReusableCell(withIdentifier: TunnelsEditTableViewButtonCell.id, for: indexPath) as! TunnelsEditTableViewButtonCell
cell.buttonText = "Add peer"
cell.onTapped = { [weak self] in
guard let s = self else { return }
let addedSectionIndices = s.appendEmptyPeer()
tableView.insertSections(addedSectionIndices, with: .automatic)
}
return cell
}
}
func appendEmptyPeer() -> IndexSet {
let numberOfInterfaceSections = interfaceFieldsBySection.count
let numberOfPeerSections = peerFieldsBySection.count
tunnelViewModel.appendEmptyPeer()
let addedPeerIndex = tunnelViewModel.peersData.count - 1
let firstAddedSectionIndex = (numberOfInterfaceSections + addedPeerIndex * numberOfPeerSections)
let addedSectionIndices = IndexSet(integersIn: firstAddedSectionIndex ..< firstAddedSectionIndex + numberOfPeerSections)
return addedSectionIndices
}
func deletePeer(peer: TunnelViewModel.PeerData) -> IndexSet {
let numberOfInterfaceSections = interfaceFieldsBySection.count
let numberOfPeerSections = peerFieldsBySection.count
assert(peer.index < tunnelViewModel.peersData.count)
tunnelViewModel.deletePeer(peer: peer)
let firstRemovedSectionIndex = (numberOfInterfaceSections + peer.index * numberOfPeerSections)
let removedSectionIndices = IndexSet(integersIn: firstRemovedSectionIndex ..< firstRemovedSectionIndex + numberOfPeerSections)
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 TunnelsEditTableViewKeyValueCell: UITableViewCell {
static let id: String = "TunnelsEditTableViewKeyValueCell"
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
}
}
var isValueValid: Bool = true {
didSet(value) {
if (value) {
keyLabel.textColor = isValueEditable ? UIColor.black : UIColor.gray
} else {
keyLabel.textColor = UIColor.red
}
}
}
var onValueChanged: ((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
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func prepareForReuse() {
super.prepareForReuse()
key = ""
value = ""
placeholderText = ""
isValueEditable = true
isValueValid = true
onValueChanged = nil
}
}
extension TunnelsEditTableViewKeyValueCell: 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 ?? "")
}
}
}
class TunnelsEditTableViewButtonCell: UITableViewCell {
static let id: String = "TunnelsEditTableViewButtonCell"
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() {
buttonText = ""
onTapped = nil
}
}
class TunnelsEditTableViewSwitchCell: UITableViewCell {
static let id: String = "TunnelsEditTableViewSwitchCell"
var message: String {
get { return textLabel?.text ?? "" }
set(value) { textLabel!.text = value }
}
var isOn: Bool {
get { return switchView.isOn }
set(value) { switchView.isOn = value }
}
let switchView: UISwitch
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
switchView = UISwitch()
super.init(style: .default, reuseIdentifier: reuseIdentifier)
accessoryView = switchView
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func prepareForReuse() {
message = ""
isOn = false
}
}
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