Feat: UserDataRepository 구현

- 유저 정보 (닉네임, accessToken)을 가져올 수 있는 repository 구현

- UserDataRepository 의존성 등록

Author: taipaise

Projects/DataSource/Sources/Common/DataSourceDependencyAssembler.swift

@@ -37,5 +37,9 @@ public struct DataSourceDependencyAssembler: DependencyAssemblerProtocol {
         DIContainer.shared.register(type: OnboardingRepositoryProtocol.self) { _ in
             return OnboardingRepository(networkService: networkService, keychainStorage: keychainStorage)
         }
+
+        DIContainer.shared.register(type: UserDataRepositoryProtocol.self) { _ in
+            return UserDataRepository(keychainStorage: keychainStorage, userDefaultsStorage: userDefaultsStorage)
+        }
     }
 }

Projects/DataSource/Sources/Common/Error/UserError.swift

@@ -0,0 +1,24 @@
+//
+//  UserError.swift
+//  DataSource
+//
+//  Created by 이동현 on 7/20/25.
+//
+
+enum UserError: Error, CustomStringConvertible {
+    case accessTokenLoadFailed
+    case nicknameLoadFailed
+    case unknown(error: Error)
+
+
+    public var description: String {
+        switch self {
+        case .accessTokenLoadFailed:
+            return "토큰 불러오기에 실패했습니다."
+        case .nicknameLoadFailed:
+            return "닉네임 불러오기에 실패했습니다."
+        case .unknown(let error):
+            return "알 수 없는 에러가 발생했습니다. \(error.localizedDescription)"
+        }
+    }
+}

Projects/DataSource/Sources/Repository/UserDataRepository.swift

@@ -0,0 +1,37 @@
+//
+//  UserDataRepository.swift
+//  DataSource
+//
+//  Created by 이동현 on 7/20/25.
+//
+
+import Foundation
+import Domain
+
+final class UserDataRepository: UserDataRepositoryProtocol {
+    private let keychainStorage: KeychainStorageProtocol
+    private let userDefaultsStorage: UserDefaultsStorageProtocol
+
+    init(keychainStorage: KeychainStorageProtocol, userDefaultsStorage: UserDefaultsStorageProtocol) {
+        self.keychainStorage = keychainStorage
+        self.userDefaultsStorage = userDefaultsStorage
+    }
+
+    // TODO: - accessToken fetch 로직 상의 후 결정
+    func loadAccessToken() throws -> String {
+        guard
+            let token = keychainStorage.load(forKey: TokenType.accessToken.rawValue)
+        else { throw UserError.accessTokenLoadFailed }
+
+        return token
+    }
+    
+    func loadNickname() throws -> String {
+        guard
+            let nickname: String = userDefaultsStorage.load(forKey: UserDefaultsKey.nickname.rawValue)
+        else { throw UserError.nicknameLoadFailed }
+
+        return nickname
+    }
+}
+

Projects/Domain/Sources/Protocol/Repository/UserDataRepositoryProtocol.swift

@@ -0,0 +1,17 @@
+//
+//  UserDataRepositoryProtocol.swift
+//  DataSource
+//
+//  Created by 이동현 on 7/20/25.
+//
+
+/// 유저의 이름, 토큰 등 유저 정보와 관련된 데이터를 가져오는 Repository
+public protocol UserDataRepositoryProtocol {
+    /// 저장한 accessToken을 가져옵니다.
+    /// - Returns: accessToken
+    func loadAccessToken() throws -> String
+
+    /// 저장한 닉네임을 가져옵니다.
+    /// - Returns: 유저 닉네임
+    func loadNickname() throws -> String
+}