0 { let randoms: [UInt8] = (0 ..< 16).map { _ in var random: UInt8 = 0 /// SecRandomCopyBytes(_:_:_)를 사용하여 암호로 보호된 'nonce' 를 생성한다. let errorCode = SecRandomCopyBytes(kSecRandomDefault, 1, &random) if errorCode != errSecSuccess { fatalError("Unable to generate nonce. SecRandomCopyBytes failed with OSStatus \(errorCode)") } return random } randoms.forEach { random in if remainingLength == 0 { return } if random < charset.count { nonce.append(charset[Int(random)]) remainingLength -= 1 } } } return nonce } ">

func randomNonceString(length: Int = 32) -> String {
    precondition(length > 0)
    let charset: Array<Character> =
        Array("0123456789ABCDEFGHIJKLMNOPQRSTUVXYZabcdefghijklmnopqrstuvwxyz-._")
    var nonce = ""
    var remainingLength = length
    
    while remainingLength > 0 {
        let randoms: [UInt8] = (0 ..< 16).map { _ in
            var random: UInt8 = 0
            /// SecRandomCopyBytes(_:_:_)를 사용하여 암호로 보호된 'nonce' 를 생성한다.
            let errorCode = SecRandomCopyBytes(kSecRandomDefault, 1, &random)
            if errorCode != errSecSuccess {
                fatalError("Unable to generate nonce. SecRandomCopyBytes failed with OSStatus \(errorCode)")
            }
            return random
        }
        
        randoms.forEach { random in
            if remainingLength == 0 {
                return
            }
            
            if random < charset.count {
                nonce.append(charset[Int(random)])
                remainingLength -= 1
            }
        }
    }
    
    return nonce
}

func sha256(_ input: String) -> String {
    let inputData = Data(input.utf8)
    let hashedData = SHA256.hash(data: inputData)
    let hashString = hashedData.compactMap {
        return String(format: "%02x", $0)
    }.joined()
    
    return hashString
}

func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization)

/// userIdentifier
let userIdentifier = appleIDCredential.user

/// A JSON Web Token (JWT) that securely communicates information about the user to the app.
let identityToken = appleIDCredential.identityToken

/// short-lived token as proof that it has authorization to interact with the server
let authorizationCode = appleIDCredential.authorizationCode

let user = passwordCredential.user
let password = passwordCredential.password