refac: better error handling & moved IsOnline logic to cleaner place

internal/infrastructure/useCases/GetArticle.go

@@ -10,8 +10,21 @@ func NewGetArticleUseCase(articleRepository article.Repository) *GetArticleUseCa
 	return &GetArticleUseCase{articleRepository}
 }
 
-func (g *GetArticleUseCase) GetArticle(id uint32) (article.Article, error) {
-	return g.articleRepository.Get(id)
+func (u *GetArticleUseCase) GetOnlineArticle(id uint32) (article.Article, error) {
+	art, err := u.articleRepository.Get(id)
+	if err != nil {
+		return article.Article{}, err
+	}
+
+	if !art.IsOnline {
+		return article.Article{}, article.ErrArticleNotFound
+	}
+
+	return art, nil
+}
+
+func (u *GetArticleUseCase) GetArticle(id uint32) (article.Article, error) {
+	return u.articleRepository.Get(id)
 }
 
 func (g *GetArticleUseCase) GetArticleByName(name string) (article.Article, error) {

internal/infrastructure/useCases/ListArticles.go

@@ -10,6 +10,13 @@ func NewListArticlesUseCase(articleRepository article.Repository) *ListArticlesU
 	return &ListArticlesUseCase{articleRepository}
 }
 
-func (g *ListArticlesUseCase) ListArticles() []article.Article {
-	return g.articleRepository.GetAll()
+func (u *ListArticlesUseCase) ListOnlineArticles() ([]article.Article, error) {
+	online := true
+	return u.articleRepository.FindByFilters(article.Filters{
+		IsOnline: &online,
+	})
+}
+
+func (u *ListArticlesUseCase) ListAllArticles() ([]article.Article, error) {
+	return u.articleRepository.FindByFilters(article.Filters{})
 }