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Merge pull request #18 from occamLab/ayush/firebase-integration
Integrate Firebase SSO and User Profiles
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,153 @@ | ||
| // | ||
| // AuthManager.swift | ||
| // MusicalCaneGame | ||
| // | ||
| // Created by occamlab on 11/12/24. | ||
| // Copyright © 2024 occamlab. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
| import FirebaseCore | ||
| import FirebaseAuth | ||
| import CryptoKit | ||
| import AuthenticationServices | ||
| import SwiftUI | ||
|
|
||
| class AuthManager: NSObject, ObservableObject, ASAuthorizationControllerDelegate { | ||
| public static var shared = AuthManager() | ||
| private var currentNonce: String? | ||
|
|
||
| @Published var currentUID: String? | ||
| @Published var currentEmail: String? | ||
|
|
||
| private let firebaseAuth = Auth.auth() | ||
|
|
||
| private override init() { | ||
| currentUID = firebaseAuth.currentUser?.uid | ||
| currentEmail = firebaseAuth.currentUser?.email | ||
| super.init() | ||
| createAuthListener() | ||
| } | ||
|
|
||
| private func createAuthListener() { | ||
| firebaseAuth.addStateDidChangeListener() { (auth, user) in | ||
| self.currentUID = user?.uid | ||
| print("currentUID \(self.currentUID ?? "nil")") | ||
| print("currentEmail \(user?.email)") | ||
| print("name \(user?.displayName)") | ||
|
|
||
| // Ensure that a document exists for the current user within | ||
| // firebase | ||
| if self.currentUID != nil { | ||
| FirebaseManager.shared.checkOrAppendInstructorUID(instructorUID: self.currentUID!) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private func randomNonceString(length: Int = 32) -> String { | ||
| precondition(length > 0) | ||
| var randomBytes = [UInt8](repeating: 0, count: length) | ||
| let errorCode = SecRandomCopyBytes(kSecRandomDefault, randomBytes.count, &randomBytes) | ||
| if errorCode != errSecSuccess { | ||
| fatalError( | ||
| "Unable to generate nonce. SecRandomCopyBytes failed with OSStatus \(errorCode)" | ||
| ) | ||
| } | ||
|
|
||
| let charset: [Character] = | ||
| Array("0123456789ABCDEFGHIJKLMNOPQRSTUVXYZabcdefghijklmnopqrstuvwxyz-._") | ||
|
|
||
| let nonce = randomBytes.map { byte in | ||
| // Pick a random character from the set, wrapping around if needed. | ||
| charset[Int(byte) % charset.count] | ||
| } | ||
|
|
||
| return String(nonce) | ||
| } | ||
|
|
||
| private func sha256(_ input: String) -> String { | ||
| let inputData = Data(input.utf8) | ||
| let hashedData = SHA256.hash(data: inputData) | ||
| let hashString = hashedData.compactMap { | ||
| String(format: "%02x", $0) | ||
| }.joined() | ||
|
|
||
| return hashString | ||
| } | ||
|
|
||
| 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.performRequests() | ||
| } | ||
|
|
||
| /// A callback function that indicates authentication was successful. | ||
| /// - Parameters: | ||
| /// - controller: the controller that was used for authentication | ||
| /// - authorization: the authorization generated by the Apple authentication procedure | ||
| 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, including the user's full name. | ||
| let credential = OAuthProvider.appleCredential(withIDToken: idTokenString, | ||
| rawNonce: nonce, | ||
| fullName: appleIDCredential.fullName) | ||
| // Sign in with Firebase. | ||
| Auth.auth().signIn(with: credential) { (authResult, error) in | ||
| if let error = error { | ||
| // 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. | ||
| // ... | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// A callback function that is called when the authentication request failed | ||
| /// - Parameters: | ||
| /// - controller: the controller that requested the authentication with Apple | ||
| /// - error: the error that occurred | ||
| func authorizationController(controller: ASAuthorizationController, didCompleteWithError error: Error) { | ||
| // Handle error. | ||
| print("Sign in with Apple errored: \(error)") | ||
| } | ||
| } | ||
|
|
||
| /// A wrapper for the "Sign in with Apple" button for SwiftUI | ||
| struct SignInWithApple: UIViewRepresentable { | ||
| /// Creates the UIView as part of the `UIViewRepresentable` protocol | ||
| /// - Parameter context: the context for creating the UIView | ||
| /// - Returns: the UIView | ||
| func makeUIView(context: Context) -> ASAuthorizationAppleIDButton { | ||
| return ASAuthorizationAppleIDButton() | ||
| } | ||
|
|
||
| /// | ||
| /// - Parameters: | ||
| /// - uiView: a handle to the ASAuthorizationAppleIDButton | ||
| /// - context: the context in which the update is occurring. | ||
| func updateUIView(_ uiView: ASAuthorizationAppleIDButton, context: Context) { | ||
| // no updates | ||
| } | ||
| } |
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