feat: CurrentValueSubject를 통해 FirebaseAuth의 세션이 상시 반영되도록 추가

Author: opficdev

DevLog/Data/Repository/AuthSessionRepositoryImpl.swift

@@ -6,15 +6,25 @@
 //
 
 import Combine
+import Foundation
 
 final class AuthSessionRepositoryImpl: AuthSessionRepository {
     private let authService: AuthService
     private let userDefaultsStore: UserDefaultsStore
+    private var cancellables = Set<AnyCancellable>()
 
     init(authService: AuthService, userDefaultsStore: UserDefaultsStore) {
         self.authService = authService
         self.userDefaultsStore = userDefaultsStore
         self.signIn = authService.uid != nil
+
+        authService.signedInPublisher
+            .removeDuplicates()
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] signIn in
+                self?.setSession(signIn)
+            }
+            .store(in: &cancellables)
     }
 
     @Published private var signIn: Bool = false

DevLog/Data/Repository/AuthenticationRepositoryImpl.swift

@@ -44,16 +44,21 @@ final class AuthenticationRepositoryImpl: AuthenticationRepository {
               let providerID = try await authService.getProviderID(),
               let provider = AuthProvider(rawValue: providerID)
         else {
-            throw AuthError.notAuthenticated
+            try await authService.clearCurrentSession()
+            return
         }
 
-        switch provider {
-        case .apple:
-            try await appleAuthService.signOut(uid)
-        case .github:
-            try await githubAuthService.signOut(uid)
-        case .google:
-            try await googleAuthService.signOut(uid)
+        do {
+            switch provider {
+            case .apple:
+                try await appleAuthService.signOut(uid)
+            case .github:
+                try await githubAuthService.signOut(uid)
+            case .google:
+                try await googleAuthService.signOut(uid)
+            }
+        } catch AuthError.notAuthenticated {
+            try await authService.clearCurrentSession()
         }
     }
 

DevLog/Infra/Service/AuthService.swift

@@ -5,6 +5,7 @@
 //  Created by 최윤진 on 11/29/25.
 //
 
+import Combine
 import FirebaseAuth
 import FirebaseFirestore
 import FirebaseMessaging
@@ -13,15 +14,34 @@ final class AuthService {
     private let store = Firestore.firestore()
     private let messaging = Messaging.messaging()
     private let logger = Logger(category: "AuthService")
+    private let subject = CurrentValueSubject<Bool, Never>(Auth.auth().currentUser != nil)
+    private var handler: AuthStateDidChangeListenerHandle?
 
     var uid: String? {
         Auth.auth().currentUser?.uid
     }
 
+    var signedInPublisher: AnyPublisher<Bool, Never> {
+        subject.eraseToAnyPublisher()
+    }
+
     var providerIDs: [String] {
         Auth.auth().currentUser?.providerData.map { $0.providerID } ?? []
     }
 
+    init() {
+        handler = Auth.auth().addStateDidChangeListener { [weak self] _, user in
+            let signedIn = user != nil
+            self?.logger.info("Firebase auth state changed. signedIn: \(signedIn)")
+            self?.subject.send(signedIn)
+        }
+    }
+
+    deinit {
+        guard let handler else { return }
+        Auth.auth().removeStateDidChangeListener(handler)
+    }
+
     func getProviderID() async throws -> String? {
         logger.info("Fetching current provider ID")