mirror of
https://github.com/leonboe1/QuickDrop.git
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583 lines
22 KiB
Swift
583 lines
22 KiB
Swift
//
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// NearbyConnectionManager.swift
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// QuickDrop
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//
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// Created by Grishka on 08.04.2023.
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//
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#if os(iOS)
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import UIKit
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import DeviceKit
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#endif
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import Foundation
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import Network
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import System
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import SwiftECC
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import CryptoKit
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import SwiftUI
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import QRCode
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public class NearbyConnectionManager: NSObject, NetServiceDelegate, InboundNearbyConnectionDelegate, OutboundNearbyConnectionDelegate, ObservableObject {
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#if !EXTENSION
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private let sleepManager = SleepManager.shared
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#endif
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private var tcpListener: NWListener
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private var mdnsServices: [NetService] = []
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private var incomingConnections: [String: InboundNearbyConnection] = [:]
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private var foundServices: [String: FoundServiceInfo] = [:]
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private var shareExtensionDelegates: [OutboundAppDelegate] = []
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private var outgoingTransfers: [String: OutgoingTransferInfo] = [:]
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private var startedDeviceDiscovery = false
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private var startedAdvertising = false
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private var browsers: [NWBrowser] = []
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private let serviceTypes = ["_FC9F5ED42C8A._tcp."]
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private var qrCodePrivateKey: ECPrivateKey?
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private var qrCodeAdvertisingToken: Data?
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private var qrCodeNameEncryptionKey: SymmetricKey?
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private let hasConnectionMonitor = NWPathMonitor()
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private let connectionMonitorQueue = DispatchQueue(label: "NetworkConnectionMonitorQueue")
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public let deviceInfo: EndpointInfo
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public let endpointID: [UInt8] = generateEndpointID()
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public var mainAppDelegate: (any InboundAppDelegate)?
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public static let shared = NearbyConnectionManager()
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@Published var attachments: AttachmentDetails? = nil
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@Published var hasLocalNetworkPermission = true
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@Published var isConnectedToLocalNetwork = true
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public var connectionUpdateCallback: (Bool) -> Void = { _ in } {
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didSet {
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connectionUpdateCallback(isConnectedToLocalNetwork)
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}
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}
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override init() {
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#if os(macOS)
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self.deviceInfo = EndpointInfo(name: Host.current().localizedName ?? "Mac", deviceType: .computer)
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#else
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let marketingName = Device.current.description.withoutBracketedContent
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let isiPad = UIDevice.current.model == "iPad"
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self.deviceInfo = EndpointInfo(name: marketingName, deviceType: isiPad ? .tablet : .phone)
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#endif
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tcpListener = try! NWListener(using: NWParameters(tls: .none))
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super.init()
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hasConnectionMonitor.pathUpdateHandler = { path in
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#if os(macOS)
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// On Mac, the local network is available as long as the path is satisfied, since Macs do not have cellular modems
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let isConnected = path.status == .satisfied
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#else
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// On iPhone and iPad, the local network is only available using Wi-Fi or Ethernet
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let isConnected = path.usesInterfaceType(.wifi) || path.usesInterfaceType(.wiredEthernet)
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#endif
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DispatchQueue.main.async {
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if isConnected {
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log("[NearbyConnectionManager] Connected to local network.")
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} else {
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log("[NearbyConnectionManager] Local network lost.")
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}
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self.isConnectedToLocalNetwork = isConnected
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self.connectionUpdateCallback(isConnected)
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}
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}
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hasConnectionMonitor.start(queue: connectionMonitorQueue)
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}
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public func becomeVisible() {
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if startedAdvertising {
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log("[NearbyConnectionManager] Already advertising, skipping")
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return
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}
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log("[NearbyConnectionManager] Becoming visible")
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tcpListener = try! NWListener(using: NWParameters(tls: .none))
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startedAdvertising = true
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tcpListener.stateUpdateHandler = { (state: NWListener.State) in
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if case .ready = state {
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self.initMDNS()
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}
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}
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tcpListener.newConnectionHandler = { (connection: NWConnection) in
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let id = UUID().uuidString
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let conn = InboundNearbyConnection(connection: connection, id: id)
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self.incomingConnections[id] = conn
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conn.delegate = self
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conn.start()
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}
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tcpListener.start(queue: .global(qos: .utility))
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}
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public func becomeInvisible() {
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if !startedAdvertising {
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log("[NearbyConnectionManager] Already invisible, ignoring becomeInvisible()")
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return
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}
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log("[NearbyConnectionManager] Becoming invisible")
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startedAdvertising = false
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self.stopMDNS()
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tcpListener.cancel()
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}
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private static func generateEndpointID() -> [UInt8] {
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// Try to retrieve from UserDefaults
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if let savedString = Settings.shared.endpointID,
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let savedData = savedString.data(using: .utf8) {
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return [UInt8](savedData)
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}
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// Generate a new random ID
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var id: [UInt8] = []
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let alphabet = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".compactMap { UInt8($0.asciiValue!) }
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for _ in 0 ..< 4 {
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id.append(alphabet[Int.random(in: 0 ..< alphabet.count)])
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}
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// Save to UserDefaults as String
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let idString = String(bytes: id, encoding: .utf8) ?? ""
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Settings.shared.endpointID = idString
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return id
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}
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private func initMDNS() {
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let nameBytes: [UInt8] = [
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0x23, // PCP
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endpointID[0], endpointID[1], endpointID[2], endpointID[3],
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0xFC, 0x9F, 0x5E, // Service ID hash
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0, 0,
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]
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let name = Data(nameBytes).urlSafeBase64EncodedString()
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let port = Int32(tcpListener.port!.rawValue)
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mdnsServices = serviceTypes.map { serviceType in
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let service = NetService(domain: "", type: serviceType, name: name, port: port)
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service.delegate = self
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service.setTXTRecord(NetService.data(fromTXTRecord: [
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"n": deviceInfo.serialize().urlSafeBase64EncodedString().data(using: .utf8)!,
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]))
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service.publish()
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return service
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}
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}
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private func stopMDNS() {
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// Gracefully stop each published service
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for service in mdnsServices {
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service.stop()
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}
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mdnsServices.removeAll()
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}
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func obtainUserConsent(transfer: TransferMetadata, device: RemoteDeviceInfo, connection _: InboundNearbyConnection, acceptAutomatically: Bool) {
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mainAppDelegate?.obtainUserConsent(transfer: transfer, device: device, acceptAutomatically: acceptAutomatically)
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}
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func connectionWasTerminated(connection: InboundNearbyConnection, error: Error?) {
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incomingConnections.removeValue(forKey: connection.id)
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if !connection.wasUserRejected {
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mainAppDelegate?.connectionWasTerminated(from: connection.remoteDeviceInfo ?? RemoteDeviceInfo(name: "UnknownDevice".localized(), type: .unknown), wasPlainTextTransfer: connection.isPlainTextTransfer, error: error)
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}
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}
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func updatedTransferProgress(connection: InboundNearbyConnection, progress: Double) {
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mainAppDelegate?.transferProgress(connectionID: connection.id, progress: progress)
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}
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public func submitUserConsent(transferID: String, accept: Bool, trustDevice: Bool, storeInTemp: Bool = false) {
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guard let conn = incomingConnections[transferID] else { return }
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log("[NearbyConnectionManager] Submitting user consent for transfer \(transferID), accepted: \(accept), store in temp: \(storeInTemp)")
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conn.submitUserConsent(accepted: accept, trustDevice: trustDevice, storeInTemp: storeInTemp)
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}
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public func startDeviceDiscovery() {
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if !startedDeviceDiscovery {
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startedDeviceDiscovery = true
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foundServices.removeAll()
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log("[NearbyConnectionManager] Starting device discovery")
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if browsers.isEmpty {
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for type in serviceTypes {
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log("[NearbyConnectionManager] Starting browser for type \(type)")
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let browser = NWBrowser(for: .bonjourWithTXTRecord(type: type, domain: nil), using: .tcp)
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browser.browseResultsChangedHandler = { _, changes in
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for change in changes {
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switch change {
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case let .added(res):
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self.addFoundDevice(service: res)
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case let .removed(res):
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self.removeFoundDevice(service: res)
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default:
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log("[NearbyConnectionManager] Ignoring change \(change)")
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}
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}
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}
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browser.stateUpdateHandler = { newState in
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switch newState {
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case .failed(let error):
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log("[NearbyConnectionManager] Browser failed: \(error)")
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case .ready:
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log("[NearbyConnectionManager] Browser ready")
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self.hasLocalNetworkPermission = true
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case .waiting(let error):
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log("[NearbyConnectionManager] Browser waiting: \(error)")
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if error == NWError.dns(DNSServiceErrorType(kDNSServiceErr_PolicyDenied)) {
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log("[NearbyConnectionManager] Local network access not granted.")
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self.hasLocalNetworkPermission = false
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}
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default:
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break
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}
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}
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browser.start(queue: .main)
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browsers.append(browser)
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}
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}
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}
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}
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public func stopDeviceDiscovery() {
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if startedDeviceDiscovery {
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log("[NearbyConnectionManager] Stopping device discovery")
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for browser in browsers {
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browser.cancel()
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}
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browsers.removeAll()
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startedDeviceDiscovery = false
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for delegate in shareExtensionDelegates {
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foundServices.values.forEach { service in
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guard let device = service.device, let id = device.id else { return }
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delegate.removeDevice(id: id)
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}
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}
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}
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}
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public func addShareExtensionDelegate(_ delegate: OutboundAppDelegate) {
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shareExtensionDelegates.append(delegate)
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for service in foundServices.values {
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guard let device = service.device else { continue }
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delegate.addDevice(device: device)
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}
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}
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public func removeShareExtensionDelegate(_ delegate: OutboundAppDelegate) {
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shareExtensionDelegates.removeAll(where: { $0 === delegate })
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}
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public func cancelTransfer(id: String) {
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if let transfer = incomingConnections[id] {
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transfer.cancel()
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}
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if let transfer = outgoingTransfers[id] {
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transfer.connection.cancel()
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}
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}
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private func endpointID(for service: NWBrowser.Result) -> String? {
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guard case let NWEndpoint.service(name: serviceName, type: _, domain: _, interface: _) = service.endpoint else { return nil }
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guard let nameData = Data.dataFromUrlSafeBase64(serviceName) else { return nil }
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guard nameData.count >= 10 else { return nil }
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let pcp = nameData[0]
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guard pcp == 0x23 else { return nil }
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let endpointID = String(data: nameData.subdata(in: 1 ..< 5), encoding: .ascii)!
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let serviceIDHash = nameData.subdata(in: 5 ..< 8)
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guard serviceIDHash == Data([0xFC, 0x9F, 0x5E]) else { return nil }
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return endpointID
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}
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private func addFoundDevice(service: NWBrowser.Result) {
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log("[NearbyConnectionManager] Found Service \(service)")
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for interface in service.interfaces {
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if case .loopback = interface.type {
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return
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}
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}
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guard let endpointID = endpointID(for: service) else { return }
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var foundService = FoundServiceInfo(service: service)
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guard case let NWBrowser.Result.Metadata.bonjour(txtRecord) = service.metadata else { return }
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guard let endpointInfoEncoded = txtRecord.dictionary["n"] else { return }
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guard let endpointInfoData = Data.dataFromUrlSafeBase64(endpointInfoEncoded) else { return }
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guard var endpointInfo = EndpointInfo(data: endpointInfoData) else { return }
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var deviceInfo: RemoteDeviceInfo?
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if let _ = endpointInfo.name {
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deviceInfo = addFoundDevice(foundService: &foundService, endpointInfo: endpointInfo, endpointID: endpointID)
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}
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if let qrData = endpointInfo.qrCodeData, let qrCodeAdvertisingToken = qrCodeAdvertisingToken, let qrCodeNameEncryptionKey = qrCodeNameEncryptionKey {
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log("[NearbyConnectionManager] Device has QR data: \(qrData.base64EncodedString()), advertising token is \(qrCodeAdvertisingToken.base64EncodedString())")
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if qrData == qrCodeAdvertisingToken {
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if let deviceInfo = deviceInfo {
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for delegate in shareExtensionDelegates {
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delegate.startTransferWithQrCode(device: deviceInfo)
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}
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}
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}
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else if qrData.count > 28 {
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do {
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let box = try AES.GCM.SealedBox(combined: qrData)
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let decryptedName = try AES.GCM.open(box, using: qrCodeNameEncryptionKey, authenticating: qrCodeAdvertisingToken)
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guard let name = String.init(data: decryptedName, encoding: .utf8) else { return }
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endpointInfo.name = name
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let deviceInfo = addFoundDevice(foundService: &foundService, endpointInfo: endpointInfo, endpointID: endpointID)
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for delegate in shareExtensionDelegates {
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delegate.startTransferWithQrCode(device: deviceInfo)
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}
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} catch {
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log("[NearbyConnectionManager] Error decrypting QR code data of an invisible device: \(error)")
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}
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}
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}
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}
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private func addFoundDevice(foundService: inout FoundServiceInfo, endpointInfo: EndpointInfo, endpointID: String) -> RemoteDeviceInfo {
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let deviceInfo = RemoteDeviceInfo(info: endpointInfo, id: endpointID)
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foundService.device = deviceInfo
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foundServices[endpointID] = foundService
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for delegate in shareExtensionDelegates {
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delegate.addDevice(device: deviceInfo)
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}
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return deviceInfo
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}
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private func removeFoundDevice(service: NWBrowser.Result) {
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guard let endpointID = endpointID(for: service) else { return }
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guard let _ = foundServices.removeValue(forKey: endpointID) else { return }
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for delegate in shareExtensionDelegates {
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delegate.removeDevice(id: endpointID)
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}
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}
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public func generateQrCodeKey() -> Image? {
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log("[NearbyConnectionManager] Generating new QR code key")
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let domain = Domain.instance(curve: .EC256r1)
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let (pubKey, privKey) = domain.makeKeyPair()
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qrCodePrivateKey = privKey
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var keyData = Data()
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keyData.append(contentsOf: [0, 0, 2])
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let keyBytes = Data(pubKey.w.x.asSignedBytes())
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// Sometimes, for some keys, there will be a leading zero byte. Strip that, Android really hates it (it breaks the endpoint info)
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keyData.append(keyBytes.suffixOfAtMost(numBytes: 32))
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let ikm = SymmetricKey(data: keyData)
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qrCodeAdvertisingToken = HKDF.deriveKey(ikm: ikm, salt: Data(), info: "advertisingContext".data(using: .utf8)!, outputLength: 16).data()
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qrCodeNameEncryptionKey = HKDF.deriveKey(ikm: ikm, salt: Data(), info: "encryptionKey".data(using: .utf8)!, outputLength: 16)
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do {
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let qrKey = keyData.urlSafeBase64EncodedString()
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let qrCodeImage = try QRCode.build
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.text("https://quickshare.google/qrcode#key=\(qrKey)")
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.backgroundColor(CGColor(srgbRed: 1, green: 1, blue: 1, alpha: 0))
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.quietZonePixelCount(3)
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.onPixels.shape(.circle())
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.eye.shape(.squircle())
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.errorCorrection(.low)
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.generate
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.image(dimension: 1000)
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return Image(decorative: qrCodeImage, scale: 1.0, orientation: .up)
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}
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catch {
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log("Error generating QR code: \(error)")
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}
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return nil
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}
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public func startOutgoingTransfer(deviceID: String, delegate: OutboundAppDelegate, urls: [URL], textToSend: String?) {
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log("Starting outgoing transfer to \(deviceID)")
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guard let info = foundServices[deviceID] else { return }
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do {
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let localUrls = try saveFilesToTemp(urls: urls)
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let tcp = NWProtocolTCP.Options()
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tcp.noDelay = true
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let nwconn = NWConnection(to: info.service.endpoint, using: NWParameters(tls: .none, tcp: tcp))
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let conn = OutboundNearbyConnection(connection: nwconn, id: deviceID, urlsToSend: localUrls, textToSend: textToSend)
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conn.delegate = self
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conn.qrCodePrivateKey = qrCodePrivateKey
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let transfer = OutgoingTransferInfo(service: info.service, device: info.device!, connection: conn, delegate: delegate)
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outgoingTransfers[deviceID] = transfer
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conn.start()
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} catch {
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log("[NearbyConnectionManager] Error zipping URLs: \(error)")
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shareExtensionDelegates.forEach { delegate in
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delegate.connectionFailed(error: error)
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}
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}
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}
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func connectionWasEstablished(connection: OutboundNearbyConnection) {
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guard let transfer = outgoingTransfers[connection.id] else { return }
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DispatchQueue.main.async {
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transfer.delegate.connectionWasEstablished(pinCode: connection.pinCode!)
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}
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}
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func transferAccepted(connection: OutboundNearbyConnection) {
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guard let transfer = outgoingTransfers[connection.id] else { return }
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DispatchQueue.main.async {
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transfer.delegate.transferAccepted()
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}
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}
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func updatedTransferProgress(connection: OutboundNearbyConnection, progress: Double) {
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guard let transfer = outgoingTransfers[connection.id] else { return }
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DispatchQueue.main.async {
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transfer.delegate.transferProgress(progress: progress)
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}
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}
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func failedWithError(connection: OutboundNearbyConnection, error: Error) {
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guard let transfer = outgoingTransfers[connection.id] else { return }
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DispatchQueue.main.async {
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transfer.delegate.connectionFailed(error: error)
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}
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outgoingTransfers.removeValue(forKey: connection.id)
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}
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func transferFinished(connection: OutboundNearbyConnection) {
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guard let transfer = outgoingTransfers[connection.id] else { return }
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DispatchQueue.main.async {
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transfer.delegate.transferFinished()
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}
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outgoingTransfers.removeValue(forKey: connection.id)
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}
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public func getActiveConnectionsCount() -> Int {
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return incomingConnections.count + outgoingTransfers.count
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}
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private func saveFilesToTemp(urls: [URL]) throws -> [URL] {
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var modifiedUrls = [URL]()
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for url in urls {
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// if url is no file url or already in inside temp directory, do nothing
|
|
if url.isFileURL && !url.standardizedFileURL.path.contains(FileManager.default.temporaryDirectory.standardizedFileURL.path) {
|
|
|
|
let accessSuccess = url.startAccessingSecurityScopedResource()
|
|
|
|
if !accessSuccess {
|
|
log("[NearbyConnectionManager] Could not access security scoped resource at \(url)")
|
|
}
|
|
|
|
var isDirectory: ObjCBool = false
|
|
if FileManager.default.fileExists(atPath: url.path, isDirectory: &isDirectory) && isDirectory.boolValue {
|
|
let zipUrl = try Zip.createAtTemporaryDirectory(zipFilename: url.lastPathComponent, fromDirectory: url)
|
|
|
|
modifiedUrls.append(zipUrl)
|
|
}
|
|
else {
|
|
// Copy single file to temp directory
|
|
let tempUrl = FileManager.default.temporaryDirectory
|
|
.appendingPathComponent(url.lastPathComponent)
|
|
// Remove if already exists
|
|
if FileManager.default.fileExists(atPath: tempUrl.path) {
|
|
try FileManager.default.removeItem(at: tempUrl)
|
|
}
|
|
try FileManager.default.copyItem(at: url, to: tempUrl)
|
|
modifiedUrls.append(tempUrl)
|
|
}
|
|
|
|
if accessSuccess {
|
|
url.stopAccessingSecurityScopedResource()
|
|
}
|
|
|
|
}
|
|
else {
|
|
log("[NearbyConnectionManager] File URL \(url) does not point to a security scoped resource")
|
|
modifiedUrls.append(url)
|
|
}
|
|
}
|
|
|
|
return modifiedUrls
|
|
}
|
|
|
|
|
|
// -- MARK: - Internal Data Model
|
|
|
|
private struct FoundServiceInfo {
|
|
let service: NWBrowser.Result
|
|
var device: RemoteDeviceInfo?
|
|
}
|
|
|
|
|
|
private struct OutgoingTransferInfo {
|
|
let service: NWBrowser.Result
|
|
let device: RemoteDeviceInfo
|
|
let connection: OutboundNearbyConnection
|
|
let delegate: OutboundAppDelegate
|
|
}
|
|
}
|