feat: initial implementation of apple architecture

Author: russellwheatley

FirebaseSwiftUI/FirebaseAppleSwiftUI/Sources/Services/AccountService+Apple.swift

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+//
+//  AccountService+Apple.swift
+//  FirebaseUI
+//
+//  Created by Russell Wheatley on 21/10/2025.
+//
+
+@preconcurrency import FirebaseAuth
+import FirebaseAuthSwiftUI
+import Observation
+
+protocol AppleOperationReauthentication {
+  var appleProvider: AppleProviderSwift { get }
+}
+
+extension AppleOperationReauthentication {
+  @MainActor func reauthenticate() async throws -> AuthenticationToken {
+    guard let user = Auth.auth().currentUser else {
+      throw AuthServiceError.reauthenticationRequired("No user currently signed-in")
+    }
+
+    do {
+      // TODO: Implement Apple reauthentication
+      let credential = try await appleProvider.createAuthCredential()
+      try await user.reauthenticate(with: credential)
+
+      return .firebase("")
+    } catch {
+      throw AuthServiceError.signInFailed(underlying: error)
+    }
+  }
+}
+
+@MainActor
+class AppleDeleteUserOperation: AuthenticatedOperation,
+  @preconcurrency AppleOperationReauthentication {
+  let appleProvider: AppleProviderSwift
+  init(appleProvider: AppleProviderSwift) {
+    self.appleProvider = appleProvider
+  }
+
+  func callAsFunction(on user: User) async throws {
+    // TODO: Implement delete user operation
+    try await callAsFunction(on: user) {
+      try await user.delete()
+    }
+  }
+}
+

FirebaseSwiftUI/FirebaseAppleSwiftUI/Sources/Services/AppleProviderAuthUI.swift

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+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import FirebaseAuth
+import FirebaseAuthSwiftUI
+import FirebaseCore
+import SwiftUI
+
+public class AppleProviderSwift: AuthProviderSwift, DeleteUserSwift {
+  public let scopes: [String]
+  let providerId = "apple.com"
+
+  public init(scopes: [String] = []) {
+    self.scopes = scopes
+  }
+
+  @MainActor public func createAuthCredential() async throws -> AuthCredential {
+    // TODO: Implement Apple Sign In credential creation
+    // This will need to use ASAuthorizationAppleIDProvider
+    let provider = OAuthProvider(providerID: providerId)
+    return try await withCheckedThrowingContinuation { continuation in
+      provider.getCredentialWith(nil) { credential, error in
+        if let error {
+          continuation
+            .resume(throwing: AuthServiceError.signInFailed(underlying: error))
+        } else if let credential {
+          continuation.resume(returning: credential)
+        } else {
+          continuation
+            .resume(throwing: AuthServiceError
+              .invalidCredentials("Apple did not provide a valid AuthCredential"))
+        }
+      }
+    }
+  }
+
+  public func deleteUser(user: User) async throws {
+    // TODO: Implement delete user functionality
+    let operation = AppleDeleteUserOperation(appleProvider: self)
+    try await operation(on: user)
+  }
+}
+
+public class AppleProviderAuthUI: AuthProviderUI {
+  public var provider: AuthProviderSwift
+
+  public init(provider: AuthProviderSwift) {
+    self.provider = provider
+  }
+
+  public let id: String = "apple.com"
+
+  @MainActor public func authButton() -> AnyView {
+    AnyView(SignInWithAppleButton(provider: provider))
+  }
+}
+

FirebaseSwiftUI/FirebaseAppleSwiftUI/Sources/Services/AuthService+Apple.swift

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+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//
+//  AuthService+Apple.swift
+//  FirebaseUI
+//
+//  Created by Russell Wheatley on 21/10/2025.
+//
+
+import FirebaseAuthSwiftUI
+
+public extension AuthService {
+  @discardableResult
+  func withAppleSignIn(_ provider: AppleProviderSwift? = nil) -> AuthService {
+    // TODO: Register Apple provider with authentication service
+    registerProvider(providerWithButton: AppleProviderAuthUI(provider: provider ??
+        AppleProviderSwift()))
+    return self
+  }
+}
+

FirebaseSwiftUI/FirebaseAppleSwiftUI/Sources/Views/SignInWithAppleButton.swift

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+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import FirebaseAuthSwiftUI
+import SwiftUI
+
+/// A button for signing in with Apple
+@MainActor
+public struct SignInWithAppleButton {
+  @Environment(AuthService.self) private var authService
+  let provider: AuthProviderSwift
+  public init(provider: AuthProviderSwift) {
+    self.provider = provider
+  }
+}
+
+extension SignInWithAppleButton: View {
+  public var body: some View {
+    Button(action: {
+      // TODO: Implement sign in with Apple action
+      Task {
+        try await authService.signIn(provider)
+      }
+    }) {
+      HStack {
+        // TODO: Add Apple logo image
+        Image(systemName: "apple.logo")
+          .resizable()
+          .renderingMode(.template)
+          .scaledToFit()
+          .frame(width: 24, height: 24)
+          .foregroundColor(.white)
+        Text("Sign in with Apple")
+          .fontWeight(.semibold)
+          .foregroundColor(.white)
+      }
+      .frame(maxWidth: .infinity, alignment: .leading)
+      .padding()
+      .background(Color.black)
+      .cornerRadius(8)
+    }
+    .accessibilityIdentifier("sign-in-with-apple-button")
+  }
+}
+