[#245] 소셜 로그인을 취소했을 때 오류 얼럿이 뜨는 현상을 해결한다

DevLog/Data/Common/Error+.swift → DevLog/Data/Common/DataLayerError.swift

@@ -1,8 +1,8 @@
 //
-//  Error+.swift
+//  DataLayerError.swift
 //  DevLog
 //
-//  Created by 최윤진 on 11/29/25.
+//  Created by opfic on 3/11/26.
 //
 
 import Foundation
@@ -13,21 +13,6 @@ enum AuthError: Error {
     case unsupportedProvider
 }
 
-enum FirestoreError: Error, LocalizedError {
-    case dataNotFound(_ key: String)
-
-    var errorDescription: String? {
-        switch self {
-        case .dataNotFound(let key):
-            return "\(key)가 Firestore에서 존재하지 않음"
-        }
-    }
-}
-
-enum UIError: Error {
-    case notFoundTopViewController
-}
-
 enum DataError: Error {
     case invalidData(context: String)
 

DevLog/Infra/Common/InfraLayerError.swift

@@ -0,0 +1,52 @@
+//
+//  InfraLayerError.swift
+//  DevLog
+//
+//  Created by opfic on 3/11/26.
+//
+
+import AuthenticationServices
+import Foundation
+import GoogleSignIn
+
+enum FirestoreError: Error, LocalizedError {
+    case dataNotFound(_ key: String)
+
+    var errorDescription: String? {
+        switch self {
+        case .dataNotFound(let key):
+            return "\(key)가 Firestore에서 존재하지 않음"
+        }
+    }
+}
+
+enum UIError: Error {
+    case notFoundTopViewController
+}
+
+enum EmailFetchError: Error, Equatable {
+    case emailNotFound
+    case emailMismatch
+}
+
+enum SocialLoginError: Error {
+    case invalidOAuthState
+    case failedToStartWebAuthenticationSession
+}
+
+extension Error {
+    var isSocialLoginCancelled: Bool {
+        switch self {
+        // Apple 로그인 취소
+        case let authError as ASAuthorizationError:
+            return authError.code == .canceled
+        // Github 로그인 취소
+        case let webAuthError as ASWebAuthenticationSessionError:
+            return webAuthError.code == .canceledLogin
+        default:
+            let nsError = self as NSError
+            // Google 로그인 취소
+            return nsError.domain == kGIDSignInErrorDomain && nsError.code == GIDSignInError.canceled.rawValue
+        }
+    }
+}

DevLog/Infra/Service/SocialLogin/GithubAuthenticationService.swift

@@ -187,7 +187,7 @@ final class GithubAuthenticationService: NSObject, AuthenticationService {
                 // 반환된 state 값 확인 / 받아온 값이 다르면 CSRF 공격 가능성 있음
                 guard let returnedState = queryItems.first(where: { $0.name == "state" })?.value,
                     returnedState == state else {
-                    continuation.resume(throwing: URLError(.userCancelledAuthentication))
+                    continuation.resume(throwing: SocialLoginError.invalidOAuthState)
                     return
                 }
 
@@ -198,7 +198,7 @@ final class GithubAuthenticationService: NSObject, AuthenticationService {
             session.prefersEphemeralWebBrowserSession = false   //  웹에서 깃헙 로그인 후 세션 유지
 
             if !session.start() {
-                continuation.resume(throwing: URLError(.userCancelledAuthentication))
+                continuation.resume(throwing: SocialLoginError.failedToStartWebAuthenticationSession)
             }
         }
     }

DevLog/Presentation/ViewModel/LoginViewModel.swift

@@ -8,7 +8,6 @@
 import Combine
 import Foundation
 import FirebaseAuth
-import GoogleSignIn
 
 @Observable
 final class LoginViewModel: Store {
@@ -93,6 +92,7 @@ final class LoginViewModel: Store {
                 } catch {
                     send(.setLogined(false))
                     sessionUseCase.execute(false)
+                    if error.isSocialLoginCancelled { return }
                     send(.setAlert(true))
                 }
             }