refactor: 로그인 도메인에 따라 분기 및 커스텀 에러 추가

Author: opficdev

DevLog/Infra/Common/InfraLayerError.swift

@@ -5,7 +5,9 @@
 //  Created by opfic on 3/11/26.
 //
 
+import AuthenticationServices
 import Foundation
+import GoogleSignIn
 
 enum FirestoreError: Error, LocalizedError {
     case dataNotFound(_ key: String)
@@ -26,3 +28,27 @@ enum EmailFetchError: Error, Equatable {
     case emailNotFound
     case emailMismatch
 }
+
+enum SocialLoginError: Error {
+    case invalidOAuthState
+    case failedToStartWebAuthenticationSession
+}
+
+extension Error {
+    var isSocialLoginCancelled: Bool {
+        // Apple 로그인 취소
+        if let authorizationError = self as? ASAuthorizationError {
+            return authorizationError.code == .canceled
+        }
+
+        // Github 로그인 취소
+        if let webAuthenticationSessionError = self as? ASWebAuthenticationSessionError {
+            return webAuthenticationSessionError.code == .canceledLogin
+        }
+
+        let error = self as NSError
+        // Google 로그인 취소
+        return error.domain == kGIDSignInErrorDomain
+            && error.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)
             }
         }
     }