레시피 업로드 Domain, Data 영역을 정의해 보았습니다.

HomeCafeRecipes/HomeCafeRecipes/Domain/Interactor/AddRecipeInteractor.swift

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+//
+// AddRecipeInteractor.swift
+// HomeCafeRecipes
+//
+// Created by 김건호 on 7/1/24.
+//
+
+import Foundation
+import UIKit
+
+import RxSwift
+
+protocol AddRecipeInteractorDelegate: AnyObject {
+    func didLoadRecipeData(viewModel: AddRecipeViewModel)
+}
+
+protocol AddRecipeInteractor {
+    func saveRecipe(userID: Int, recipeType: RecipeType) -> Single<Result<Recipe, AddRecipeError>>
+    func updateRecipeTitle(_ title: String)
+    func updateRecipeDescription(_ description: String)
+    func addRecipeImage(_ image: UIImage)
+    func removeRecipeImage(at index: Int)
+    func loadRecipeData()
+}
+
+class AddRecipeInteractorImpl: AddRecipeInteractor {
+    private var recipeImages: [UIImage] = []
+    private var recipeTitle: String = ""
+    private var recipeDescription: String = ""
+
+    weak var delegate: AddRecipeInteractorDelegate?
+
+    private let saveRecipeUseCase: AddRecipeUseCase
+
+    init(saveRecipeUseCase: AddRecipeUseCase) {
+        self.saveRecipeUseCase = saveRecipeUseCase
+    }
+
+    func saveRecipe(userID: Int, recipeType: RecipeType) -> Single<Result<Recipe, AddRecipeError>> {
+        return saveRecipeUseCase.execute(
+            userID: userID,
+            recipeType: recipeType.rawValue,
+            title: recipeTitle,
+            description: recipeDescription,
+            images: recipeImages
+        )
+    }
+
+    func updateRecipeTitle(_ title: String) {
+        self.recipeTitle = title
+    }
+
+    func updateRecipeDescription(_ description: String) {
+        self.recipeDescription = description
+    }
+
+    func addRecipeImage(_ image: UIImage) {
+        self.recipeImages.append(image)
+    }
+
+    func removeRecipeImage(at index: Int) {
+        self.recipeImages.remove(at: index)
+    }
+
+    func loadRecipeData() {
+        let viewModel = AddRecipeViewModel(images: recipeImages, title: recipeTitle, description: recipeDescription)
+        delegate?.didLoadRecipeData(viewModel: viewModel)
+    }
+}

HomeCafeRecipes/HomeCafeRecipes/Domain/UseCases/AddRecipeUseCase.swift

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+//
+//  SaveRecipeUseCase.swift
+//  HomeCafeRecipes
+//
+//  Created by 김건호 on 7/1/24.
+//
+
+import UIKit
+
+import RxSwift
+
+protocol AddRecipeUseCase {
+    func execute(
+        userID: Int,
+        recipeType: String,
+        title: String,
+        description: String,
+        images: [UIImage]
+    ) -> Single<Result<Recipe, AddRecipeError>>
+}
+
+class AddRecipeUseCaseImpl: AddRecipeUseCase {
+    private let repository: AddRecipeRepository
+
+    init(repository: AddRecipeRepository) {
+        self.repository = repository
+    }
+
+    func execute(
+        userID: Int,
+        recipeType: String,
+        title: String,
+        description: String,
+        images: [UIImage]
+    ) -> Single<Result<Recipe, AddRecipeError>> {
+
+        guard !images.isEmpty else {
+            return .just(.failure(.noImages))
+        }
+
+        guard !title.isBlank else {
+            return .just(.failure(.titleIsEmpty))
+        }
+
+        guard description.count > 10 else {
+            return .just(.failure(.descriptionTooShort))
+        }
+
+        return repository.saveRecipe(
+            userID: userID,
+            recipeType: recipeType,
+            title: title,
+            description: description,
+            images: images
+        )
+        .map { .success($0) }
+        .catch { .just(.failure(.genericError($0))) }
+    }
+}