[Firebase] Apple 로그인

- [Firebase Console] - [Authentication]에서 Apple 추가

 

 

 

- [Target] - [Signing & Capablilties]에 [Sign in with Apple 추가]

 

 

 

 

- https://developer.apple.com/에 접속하여 [Certificates, Identifier & Profiles] - [Service IDs] 추가

 

 

 

 

- 여기서 Identifier은 BundleID에서 추가로 글자를 입력함

 

- 생성 완료 된 Identifiers 클릭하고 Configure

 

- 이 창이 등장할것이다.

 

 

 

 

 

 - Domains and Subdomains에는  승인된 도메인명(.firebaseapp.com으로 끝나는 항목)

 

 

 

- Return URLs은 아래 있는 콜백 URL입력

 

 

 

 

- import, 암호화와 로그인 Function

 

import AuthenticationServices
import FirebaseAuth


//Apple Sign in
extension MainViewController {
    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()
        

        
    }
    
    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
    }
    
    // Adapted from https://auth0.com/docs/api-auth/tutorials/nonce#generate-a-cryptographically-random-nonce
    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 remainingLength == 0 {
                    return
                }
                
                if random < charset.count {
                    result.append(charset[Int(random)])
                    remainingLength -= 1
                }
            }
        }
        
        return result
    }
}

 

 

 

- ASAuthorizationControllerDelegate, ASAuthorizationControllerPresentationContextProviding

 

extension MainViewController: ASAuthorizationControllerDelegate {
    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
            }
            
            let credential = OAuthProvider.credential(withProviderID: "apple.com", idToken: idTokenString, rawNonce: nonce)
            
            Auth.auth().signIn(with: credential) { authResult, error in
                if let error = error {
                    print ("Error Apple sign in: %@", error)
                    return
                }
                // User is signed in to Firebase with Apple.
                // ...
                ///Main 화면으로 보내기
                let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
                let mainViewController = storyboard.instantiateViewController(identifier: "LobbyViewController")
                mainViewController.modalPresentationStyle = .fullScreen
                self.navigationController?.show(mainViewController, sender: nil)
            }
        }
    }
}



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