[#32] AccountView를 Store 프로토콜을 채택한 뷰모델을 사용하여 재구성한다

DevLog/App/Assembler/DataAssembler.swift

@@ -37,6 +37,24 @@ final class DataAssembler: Assembler {
             AuthSessionRepositoryImpl(authService: container.resolve(AuthService.self))
         }
 
+        container.register(AuthDataRepository.self) {
+            AuthDataRepositoryImpl(
+                authService: container.resolve(AuthService.self),
+                appleAuthService: container.resolve(
+                    AuthenticationService.self,
+                    name: "AppleAuthenticationService"
+                ),
+                githubAuthService: container.resolve(
+                    AuthenticationService.self,
+                    name: "GithubAuthenticationService"
+                ),
+                googleAuthService: container.resolve(
+                    AuthenticationService.self,
+                    name: "GoogleAuthenticationService"
+                )
+            )
+        }
+
         container.register(UserDataRepository.self) {
             UserDataRepositoryImpl(userService: container.resolve(UserService.self))
         }

DevLog/App/Assembler/DomainAssembler.swift

@@ -70,5 +70,17 @@ final class DomainAssembler: Assembler {
         container.register(FetchPushNotificationsUseCase.self) {
             FetchPushNotificationsUseCaseImpl(container.resolve(PushNotificationRepository.self))
         }
+
+        container.register(FetchAuthProvidersUseCase.self) {
+            FetchAuthProvidersUseCaseImpl(container.resolve(AuthDataRepository.self))
+        }
+
+        container.register(LinkAuthProviderUseCase.self) {
+            LinkAuthProviderUseCaseImpl(container.resolve(AuthDataRepository.self))
+        }
+
+        container.register(UnlinkAuthProviderUseCase.self) {
+            UnlinkAuthProviderUseCaseImpl(container.resolve(AuthDataRepository.self))
+        }
     }
 }

DevLog/Data/Common/Error+.swift

@@ -9,6 +9,8 @@ import Foundation
 
 enum AuthError: Error {
     case notAuthenticated
+    case failedToUnlinkLastProvider
+    case unsupportedProvider
 }
 
 enum FirestoreError: Error, LocalizedError {

DevLog/Data/Repository/AuthDataRepositoryImpl.swift

@@ -0,0 +1,82 @@
+//
+//  AuthDataRepositoryImpl.swift
+//  DevLog
+//
+//  Created by 최윤진 on 2/12/26.
+//
+
+import FirebaseAuth
+
+final class AuthDataRepositoryImpl: AuthDataRepository {
+    private let authService: AuthService
+    private let appleAuthService: AuthenticationService
+    private let githubAuthService: AuthenticationService
+    private let googleAuthService: AuthenticationService
+
+    init(
+        authService: AuthService,
+        appleAuthService: AuthenticationService,
+        githubAuthService: AuthenticationService,
+        googleAuthService: AuthenticationService
+    ) {
+        self.authService = authService
+        self.appleAuthService = appleAuthService
+        self.githubAuthService = githubAuthService
+        self.googleAuthService = googleAuthService
+    }
+
+    func fetchCurrentProvider() async throws -> AuthProvider? {
+        guard let providerString = try await authService.getProviderID() else {
+            return nil
+        }
+        return AuthProvider(rawValue: providerString)
+    }
+
+    func fetchAllProviders() async throws -> [AuthProvider] {
+        let providerStrings = authService.providerIDs ?? []
+        return providerStrings.compactMap { AuthProvider(rawValue: $0) }
+    }
+
+    func linkProvider(_ provider: AuthProvider) async throws {
+        guard let uid = authService.uid,
+              let user = Auth.auth().currentUser,
+              let email = user.email else {
+            throw AuthError.notAuthenticated
+        }
+
+        let service: AuthenticationService
+        switch provider {
+        case .apple:
+            service = appleAuthService
+        case .google:
+            service = googleAuthService
+        case .github:
+            service = githubAuthService
+        }
+
+        try await service.link(uid: uid, email: email)
+    }
+
+    func unlinkProvider(_ provider: AuthProvider) async throws {
+        guard let uid = authService.uid,
+              let user = Auth.auth().currentUser else {
+            throw AuthError.notAuthenticated
+        }
+
+        if user.providerData.count <= 1 {
+            throw AuthError.failedToUnlinkLastProvider
+        }
+
+        let service: AuthenticationService
+        switch provider {
+        case .apple:
+            service = appleAuthService
+        case .google:
+            service = googleAuthService
+        case .github:
+            service = githubAuthService
+        }
+
+        try await service.unlink(uid)
+    }
+}

DevLog/Domain/Protocol/AuthDataRepository.swift

@@ -5,4 +5,16 @@
 //  Created by 최윤진 on 1/5/26.
 //
 
-import Foundation
+protocol AuthDataRepository {
+    /// 현재 로그인한 프로바이더를 가져옵니다
+    func fetchCurrentProvider() async throws -> AuthProvider?
+
+    /// 연결된 모든 프로바이더 목록을 가져옵니다
+    func fetchAllProviders() async throws -> [AuthProvider]
+
+    /// 특정 프로바이더를 계정에 연결합니다
+    func linkProvider(_ provider: AuthProvider) async throws
+
+    /// 특정 프로바이더를 계정에서 해제합니다
+    func unlinkProvider(_ provider: AuthProvider) async throws
+}

DevLog/Domain/UseCase/Auth/Provider/FetchAuthProvidersUseCase.swift

@@ -0,0 +1,10 @@
+//
+//  FetchAuthProvidersUseCase.swift
+//  DevLog
+//
+//  Created by 최윤진 on 2/12/26.
+//
+
+protocol FetchAuthProvidersUseCase {
+    func execute() async throws -> (currentProvider: AuthProvider?, allProviders: [AuthProvider])
+}

DevLog/Domain/UseCase/Auth/Provider/FetchAuthProvidersUseCaseImpl.swift

@@ -0,0 +1,21 @@
+//
+//  FetchAuthProvidersUseCaseImpl.swift
+//  DevLog
+//
+//  Created by 최윤진 on 2/12/26.
+//
+
+final class FetchAuthProvidersUseCaseImpl: FetchAuthProvidersUseCase {
+    private let repository: AuthDataRepository
+
+    init(_ repository: AuthDataRepository) {
+        self.repository = repository
+    }
+
+    func execute() async throws -> (currentProvider: AuthProvider?, allProviders: [AuthProvider]) {
+        async let currentProvider = try await repository.fetchCurrentProvider()
+        async let allProviders = try await repository.fetchAllProviders()
+
+        return try await (currentProvider, allProviders)
+    }
+}

DevLog/Domain/UseCase/Auth/Provider/LinkAuthProviderUseCase.swift

@@ -0,0 +1,10 @@
+//
+//  LinkAuthProviderUseCase.swift
+//  DevLog
+//
+//  Created by 최윤진 on 2/12/26.
+//
+
+protocol LinkAuthProviderUseCase {
+    func execute(_ provider: AuthProvider) async throws
+}

DevLog/Domain/UseCase/Auth/Provider/LinkAuthProviderUseCaseImpl.swift

@@ -0,0 +1,18 @@
+//
+//  LinkAuthProviderUseCaseImpl.swift
+//  DevLog
+//
+//  Created by 최윤진 on 2/12/26.
+//
+
+final class LinkAuthProviderUseCaseImpl: LinkAuthProviderUseCase {
+    private let repository: AuthDataRepository
+
+    init(_ repository: AuthDataRepository) {
+        self.repository = repository
+    }
+
+    func execute(_ provider: AuthProvider) async throws {
+        try await repository.linkProvider(provider)
+    }
+}

DevLog/Domain/UseCase/Auth/Provider/UnlinkAuthProviderUseCase.swift

@@ -0,0 +1,10 @@
+//
+//  UnlinkAuthProviderUseCase.swift
+//  DevLog
+//
+//  Created by 최윤진 on 2/12/26.
+//
+
+protocol UnlinkAuthProviderUseCase {
+    func execute(_ provider: AuthProvider) async throws
+}

DevLog/Domain/UseCase/Auth/Provider/UnlinkAuthProviderUseCaseImpl.swift

@@ -0,0 +1,18 @@
+//
+//  UnlinkAuthProviderUseCaseImpl.swift
+//  DevLog
+//
+//  Created by 최윤진 on 2/12/26.
+//
+
+final class UnlinkAuthProviderUseCaseImpl: UnlinkAuthProviderUseCase {
+    private let repository: AuthDataRepository
+
+    init(_ repository: AuthDataRepository) {
+        self.repository = repository
+    }
+
+    func execute(_ provider: AuthProvider) async throws {
+        try await repository.unlinkProvider(provider)
+    }
+}