"identifierForVendor" for macOS

UIDevice-identifierForVendor-macOS.swift

// (c) 2023 and onwards The vChewing Project (MIT-NTL License).
// ====================
// This code is released under the MIT license (SPDX-License-Identifier: MIT)
// ... with NTL restriction stating that:
// No trademark license is granted to use the trade names, trademarks, service
// marks, or product names of Contributor, except as required to fulfill notice
// requirements defined in MIT License.
/// A Swift script to check whether a non-system process is abusing the SecureEventInput.

import IOKit
import Foundation

// MARK: - macOS Support

#if canImport(AppKit)
import IOKit

// macOS 没有 UIDevice，咱们弄个冒牌的。
struct UIDevice {
  static let current = UIDevice()
  var identifierForVendor: UUID? {
    guard let rawData = copy_mac_address() as? Data else { return nil }
    var rawStr = rawData.hexadecimalString
    guard !rawStr.isEmpty else { return nil}
    while rawStr.count < 32 {
      rawStr = rawStr + rawStr
    }
    var slot1 = ""
    var slot2 = ""
    var slot3 = ""
    var slot4 = ""
    var slot5 = ""
    while slot1.count < 8, let firstChar = rawStr.first {
      slot1.append(firstChar.description)
      rawStr.removeFirst(1)
    }
    while slot2.count < 4, let firstChar = rawStr.first {
      slot2.append(firstChar.description)
      rawStr.removeFirst(1)
    }
    while slot3.count < 4, let firstChar = rawStr.first {
      slot3.append(firstChar.description)
      rawStr.removeFirst(1)
    }
    while slot4.count < 4, let firstChar = rawStr.first {
      slot4.append(firstChar.description)
      rawStr.removeFirst(1)
    }
    while slot5.count < 12, let firstChar = rawStr.first {
      slot5.append(firstChar.description)
      rawStr.removeFirst(1)
    }
    return UUID.init(uuidString: "\(slot1)-\(slot2)-\(slot3)-\(slot4)-\(slot5)")
  }
}

// Returns an object with a +1 retain count; the caller needs to release.
// ref: https://developer.apple.com/documentation/appstorereceipts/validating_receipts_on_the_device#//apple_ref/doc/uid/TP40010573-CH1-SW14
private func io_service(named name: String, wantBuiltIn: Bool) -> io_service_t? {
  let default_port: UInt32 = kIOMainPortDefault
  var iterator = io_iterator_t()
  defer {
    if iterator != IO_OBJECT_NULL {
      IOObjectRelease(iterator)
    }
  }
  
  guard let matchingDict = IOBSDNameMatching(default_port, 0, name),
  IOServiceGetMatchingServices(default_port,
    matchingDict as CFDictionary,
    &iterator) == KERN_SUCCESS,
  iterator != IO_OBJECT_NULL
  else {
    return nil
  }
  
  
  var candidate = IOIteratorNext(iterator)
  while candidate != IO_OBJECT_NULL {
    if let cftype = IORegistryEntryCreateCFProperty(candidate,
      "IOBuiltin" as CFString,
      kCFAllocatorDefault,
      0) {
        let isBuiltIn = cftype.takeRetainedValue() as! CFBoolean
        if wantBuiltIn == CFBooleanGetValue(isBuiltIn) {
          return candidate
        }
      }
    
    
    IOObjectRelease(candidate)
    candidate = IOIteratorNext(iterator)
  }
  
  
  return nil
}

// ref: https://developer.apple.com/documentation/appstorereceipts/validating_receipts_on_the_device#//apple_ref/doc/uid/TP40010573-CH1-SW14
private func copy_mac_address() -> CFData? {
  // Prefer built-in network interfaces.
  // For example, an external Ethernet adaptor can displace
  // the built-in Wi-Fi as en0.
  guard let service = io_service(named: "en0", wantBuiltIn: true)
  ?? io_service(named: "en1", wantBuiltIn: true)
  ?? io_service(named: "en0", wantBuiltIn: false)
  else { return nil }
  defer { IOObjectRelease(service) }
  
  
  if let cftype = IORegistryEntrySearchCFProperty(
    service,
    kIOServicePlane,
    "IOMACAddress" as CFString,
    kCFAllocatorDefault,
    IOOptionBits(kIORegistryIterateRecursively | kIORegistryIterateParents)) {
      return (cftype as! CFData)
    }
  
  return nil
}

// ref: https://stackoverflow.com/a/7520655/4162914
private extension Data {
  var hexadecimalString: String {
    let charA: UInt8 = 0x61
    let char0: UInt8 = 0x30
    func byteToChar(_ b: UInt8) -> Character {
      Character(UnicodeScalar(b > 9 ? charA + b - 10 : char0 + b))
    }
    let hexChars = flatMap {[
      byteToChar(($0 >> 4) & 0xF),
      byteToChar($0 & 0xF)
    ]}
    return String(hexChars)
  }
}

#endif