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+import Foundation
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+import UIKit
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+import DcCore
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+import SDWebImageSVGKitPlugin
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+
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+class BackupTransferViewController: UIViewController {
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+
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+ private let dcContext: DcContext
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+ private let dcAccounts: DcAccounts
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+ private var dcBackupProvider: DcBackupProvider?
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+
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+ private lazy var qrContentView: UIImageView = {
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+ let view = UIImageView()
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+ view.contentMode = .scaleAspectFit
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+ view.translatesAutoresizingMaskIntoConstraints = false
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+ view.accessibilityHint = String.localized("scan_to_transfer")
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+ return view
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+ }()
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+
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+ private lazy var progressContainer: UIView = {
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+ let view = UIView()
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+ view.translatesAutoresizingMaskIntoConstraints = false
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+ view.layer.cornerRadius = 20
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+ view.clipsToBounds = true
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+ view.layer.borderColor = DcColors.grey50.cgColor
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+ view.layer.borderWidth = 1
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+ view.backgroundColor = DcColors.defaultInverseColor.withAlphaComponent(0.5)
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+ return view
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+ }()
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+
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+ private lazy var progress: UIActivityIndicatorView = {
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+ let progress = UIActivityIndicatorView(style: .white)
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+ progress.translatesAutoresizingMaskIntoConstraints = false
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+ return progress
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+ }()
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+
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+ private lazy var blurView: UIVisualEffectView = {
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+ let blurEffect = UIBlurEffect(style: .light)
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+ let view = UIVisualEffectView(effect: blurEffect)
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+ view.translatesAutoresizingMaskIntoConstraints = false
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+ return view
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+ }()
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+
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+ private var progressObserver: NSObjectProtocol?
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+
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+ init(dcAccounts: DcAccounts) {
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+ self.dcAccounts = dcAccounts
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+ self.dcContext = dcAccounts.getSelected()
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+ super.init(nibName: nil, bundle: nil)
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+ hidesBottomBarWhenPushed = true
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+ }
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+
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+ required init?(coder _: NSCoder) {
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+ fatalError("init(coder:) has not been implemented")
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+ }
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+
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+ // MARK: - lifecycle
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+ override func viewDidLoad() {
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+ super.viewDidLoad()
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+ title = String.localized("add_another_device")
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+ setupSubviews()
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+ // TODO: add some more hints about what is going on
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+
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+ DispatchQueue.global(qos: .userInitiated).async { [weak self] in
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+ guard let self = self else { return }
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+ self.dcAccounts.stopIo()
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+ self.dcBackupProvider = DcBackupProvider(self.dcContext)
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+ DispatchQueue.main.async {
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+ let image = self.getQrImage(svg: self.dcBackupProvider?.getQrSvg())
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+ self.qrContentView.image = image
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+ self.progress.stopAnimating()
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+ self.progressContainer.isHidden = true
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+ DispatchQueue.global(qos: .userInitiated).async { [weak self] in
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+ guard let self = self else { return }
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+ self.dcBackupProvider?.wait()
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+ // TODO: track events and show transfer progress
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+ // TODO: once the QR code is scanned, it can disappear from the screen
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+ }
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+ }
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+ }
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+ }
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+
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+ override func viewDidDisappear(_ animated: Bool) {
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+ // TODO: this is too harsh, aborting should be done only when the user actively quits the viewController
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+ if dcBackupProvider != nil {
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+ dcContext.stopOngoingProcess()
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+ dcBackupProvider = nil
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+ }
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+ dcAccounts.startIo()
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+ }
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+
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+ // MARK: - setup
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+ private func setupSubviews() {
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+ view.addSubview(qrContentView)
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+ view.addSubview(progressContainer)
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+ progressContainer.addSubview(blurView)
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+ progressContainer.addSubview(progress)
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+ let qrDefaultWidth = qrContentView.widthAnchor.constraint(equalTo: view.safeAreaLayoutGuide.widthAnchor, multiplier: 0.75)
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+ qrDefaultWidth.priority = UILayoutPriority(500)
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+ qrDefaultWidth.isActive = true
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+ let qrMinWidth = qrContentView.widthAnchor.constraint(lessThanOrEqualToConstant: 260)
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+ qrMinWidth.priority = UILayoutPriority(999)
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+ qrMinWidth.isActive = true
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+ view.addConstraints([
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+ qrContentView.heightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.heightAnchor, multiplier: 1.05),
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+ qrContentView.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor),
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+ qrContentView.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor),
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+ progressContainer.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor),
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+ progressContainer.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor),
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+ progressContainer.constraintHeightTo(100),
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+ progressContainer.constraintWidthTo(100),
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+ progress.constraintCenterXTo(progressContainer),
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+ progress.constraintCenterYTo(progressContainer)
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+ ])
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+ blurView.fillSuperview()
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+ progressContainer.isHidden = false
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+ progress.startAnimating()
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+ view.backgroundColor = DcColors.defaultBackgroundColor
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+ }
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+
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+ private func getQrImage(svg: String?) -> UIImage? {
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+ if let svg = svg {
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+ let svgData = svg.data(using: .utf8)
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+ return SDImageSVGKCoder.shared.decodedImage(with: svgData, options: [:])
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+ }
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+ return nil
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+ }
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+
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+}
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+
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+
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+/// Does a best effort attempt to trigger the local network privacy alert.
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+///
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+/// It works by sending a UDP datagram to the discard service (port 9) of every
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+/// IP address associated with a broadcast-capable interface. This should
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+/// trigger the local network privacy alert, assuming the alert hasn’t already
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+/// been displayed for this app.
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+///
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+/// This code takes a ‘best effort’. It handles errors by ignoring them. As
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+/// such, there’s guarantee that it’ll actually trigger the alert.
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+///
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+/// - note: iOS devices don’t actually run the discard service. I’m using it
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+/// here because I need a port to send the UDP datagram to and port 9 is
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+/// always going to be safe (either the discard service is running, in which
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+/// case it will discard the datagram, or it’s not, in which case the TCP/IP
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+/// stack will discard it).
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+///
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+/// There should be a proper API for this (r. 69157424).
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+///
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+/// For more background on this, see [Triggering the Local Network Privacy Alert](https://developer.apple.com/forums/thread/663768).
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+/// [via https://developer.apple.com/forums/thread/663768 ]
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+func triggerLocalNetworkPrivacyAlert() {
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+ let sock4 = socket(AF_INET, SOCK_DGRAM, 0)
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+ guard sock4 >= 0 else { return }
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+ defer { close(sock4) }
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+ let sock6 = socket(AF_INET6, SOCK_DGRAM, 0)
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+ guard sock6 >= 0 else { return }
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+ defer { close(sock6) }
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+
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+ let addresses = addressesOfDiscardServiceOnBroadcastCapableInterfaces()
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+ var message = [UInt8]("!".utf8)
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+ for address in addresses {
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+ address.withUnsafeBytes { buf in
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+ let sa = buf.baseAddress!.assumingMemoryBound(to: sockaddr.self)
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+ let saLen = socklen_t(buf.count)
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+ let sock = sa.pointee.sa_family == AF_INET ? sock4 : sock6
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+ _ = sendto(sock, &message, message.count, MSG_DONTWAIT, sa, saLen)
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+ }
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+ }
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+}
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+
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+/// Returns the addresses of the discard service (port 9) on every
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+/// broadcast-capable interface.
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+///
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+/// Each array entry is contains either a `sockaddr_in` or `sockaddr_in6`.
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+private func addressesOfDiscardServiceOnBroadcastCapableInterfaces() -> [Data] {
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+ var addrList: UnsafeMutablePointer<ifaddrs>?
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+ let err = getifaddrs(&addrList)
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+ guard err == 0, let start = addrList else { return [] }
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+ defer { freeifaddrs(start) }
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+ return sequence(first: start, next: { $0.pointee.ifa_next })
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+ .compactMap { i -> Data? in
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+ guard
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+ (i.pointee.ifa_flags & UInt32(bitPattern: IFF_BROADCAST)) != 0,
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+ let sa = i.pointee.ifa_addr
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+ else { return nil }
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+ var result = Data(UnsafeRawBufferPointer(start: sa, count: Int(sa.pointee.sa_len)))
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+ switch CInt(sa.pointee.sa_family) {
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+ case AF_INET:
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+ result.withUnsafeMutableBytes { buf in
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+ let sin = buf.baseAddress!.assumingMemoryBound(to: sockaddr_in.self)
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+ sin.pointee.sin_port = UInt16(9).bigEndian
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+ }
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+ case AF_INET6:
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+ result.withUnsafeMutableBytes { buf in
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+ let sin6 = buf.baseAddress!.assumingMemoryBound(to: sockaddr_in6.self)
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+ sin6.pointee.sin6_port = UInt16(9).bigEndian
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+ }
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+ default:
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+ return nil
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+ }
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+ return result
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+ }
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+}
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B. Petersen