iOS Apple Login (FierBase 연동) 구현 A-Z까지

#iOS

1. 앱 개발 설정 페이지 접속

2. 

3. 

4. Sing in with Apple 체크 후 저장

   

    

   

5. 

6. 

7. 도메인과 이메일 작성

   

8. Firebase 프로젝트 콘솔 이동

9. 

10. 

11. 로그인 제공업체에서 Apple 사용으로 설정.

    

12. xcode 프로젝트 이동

13. 

14. 애플 로그인 권한 설정

    

15. 코드 추가

빌드 환경 iOS 11.0

---

// 추가
import AuthenticationServices
import CryptoKit

// 스토리 보드에 만들어둔 UIView! 미리 바인딩 
@IBOutlet var appleSignInView: UIView! 

override func viewDidLoad()
{
    if #available(iOS 13.0, *)
        {
            appleView.isHidden = false
            appleLoginButton.isHidden = false
        }
        else    // 13.0 부터 Apple 로그인을 지원하므로 이부분은 13.0 미만 버전 빌드시 UI 조정을 위한 코드
        {
            let subHeight : CGFloat = 54
            boxHeight.constant = boxHeight.constant - subHeight
            boxInViewHeight.constant = boxInViewHeight.constant - subHeight
            appleButtonTopHeight.constant = 0
            appleButtonHeight.constant = 0

            appleView.isHidden = true
            appleLoginButton.isHidden = true
        }
}

        @available(iOS 13.2, *)
        private func setupLoginWithAppleButton()
        {
           let signInWithAppleButton = ASAuthorizationAppleIDButton(authorizationButtonType: .default, authorizationButtonStyle: .black)
            signInWithAppleButton.layer.frame = CGRect(x: 0, y: 0, width: facebookButton.layer.preferredFrameSize().width, height: facebookButton.layer.preferredFrameSize().height)
            signInWithAppleButton.cornerRadius = 5
            signInWithAppleButton.addTarget(self, action: #selector(signInWithAppleButtonPressed), for: .touchUpInside)
        appleSignInView.addSubview(signInWithAppleButton)
    }

    @available(iOS 13, *)
    @objc private func signInWithAppleButtonPressed()
    {
        if !checkLoing()
        {
            return
        }
        startSignInWithAppleFlow()
    }

@available(iOS 13.0, *)
extension LoginViewController: ASAuthorizationControllerPresentationContextProviding, ASAuthorizationControllerDelegate{

    func presentationAnchor(for controller: ASAuthorizationController) -> ASPresentationAnchor {
        return view.window!
    }


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

        if let appleIDCredential = authorization.credential as? ASAuthorizationAppleIDCredential {
            guard let nonce = currentNonce else {
                fatalError("Invalid state: A login callback was received, but no login request was sent.")
            }
            guard let appleIDToken = appleIDCredential.identityToken else {
                print("Unable to fetch identity token")
                return
            }
            guard let idTokenString = String(data: appleIDToken, encoding: .utf8) else {
                print("Unable to serialize token string from data: \(appleIDToken.debugDescription)")
                return
            }
            // Initialize a Firebase credential.
            let credential = OAuthProvider.credential(withProviderID: "apple.com",
                                                      idToken: idTokenString,
                                                      rawNonce: nonce)
            // Sign in with Firebase.
            Auth.auth().signIn(with: credential) { (authResult, error) in
                if (error != nil) {
                    // Error. If error.code == .MissingOrInvalidNonce, make sure
                    // you're sending the SHA256-hashed nonce as a hex string with
                    // your request to Apple.
                    print(error!.localizedDescription)
                    return
                }
                // User is signed in to Firebase with Apple.
                // ...

                let email = Auth.auth().currentUser?.email
                //print("Auth.auth().currentUser.email : \(email)")
                // 앱서버에서 로그인 처리
                self.appleLoginCallback(email: email!)
            }
        }
    }

    func authorizationController(controller: ASAuthorizationController, didCompleteWithError error: Error) {
        // Handle error.
        print("Sign in with Apple errored: \(error)")
    }

    // fierbase iOS 로그인 가이드
    private func randomNonceString(length: Int = 32) -> String
    {
        precondition(length > 0)
        let charset: Array<Character> =
            Array(“0123456789ABCDEFGHIJKLMNOPQRSTUVXYZabcdefghijklmnopqrstuvwxyz-._”)
        var result = “”
        var remainingLength = length

        while remainingLength > 0 {
            let randoms: [UInt8] = (0 ..< 16).map { _ in
                var random: UInt8 = 0
                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 length == 0 {
                    return
                }

                if random < charset.count {
                    result.append(charset[Int(random)])
                    remainingLength -= 1
                }
            }
        }

        return result
    }

    @available(iOS 13, *)
    func startSignInWithAppleFlow() {
        let nonce = randomNonceString()
        currentNonce = nonce
        let appleIDProvider = ASAuthorizationAppleIDProvider()
        let request = appleIDProvider.createRequest()
        request.requestedScopes = [.fullName, .email]
        request.nonce = sha256(nonce)

        let authorizationController = ASAuthorizationController(authorizationRequests: [request])
        authorizationController.delegate = self
        authorizationController.presentationContextProvider = self
        authorizationController.performRequests()
    }

    @available(iOS 13, *)
    private 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
    }
}