refac: article title rules are the same in the API request and the domain; an invalid title returns 400 instead of 500

api/handlers/article/articleHandler.go

@@ -23,7 +23,7 @@ type Handler struct {
 }
 
 type PostArticle struct {
-	Title string `json:"title" validate:"required,min=3,max=50"`
+	Title string `json:"title" validate:"required,min=3,max=200"`
 	Body  string `json:"body" validate:"required,max=10000"`
 }
 
@@ -81,6 +81,10 @@ func (h *Handler) PostArticle(w http.ResponseWriter, r *http.Request) {
 		Body:  localArticle.Body,
 	})
 	if err != nil {
+		if errors.Is(err, domain.ErrInvalidTitle) {
+			http.Error(w, apperr.ArticleTitleErrorMessage, http.StatusBadRequest)
+			return
+		}
 		http.Error(w, "Failed to create article", http.StatusInternalServerError)
 		return
 	}

api/pkg/apperr/messages.go

@@ -4,3 +4,4 @@ const LogsErrorMessage = "Access to the requested resource is forbidden due to i
 const BodyErrorMessage = "The request cannot be processed due to a mismatch in the format of the body."
 const IdUint32ErrorMessage = "The server expects the ID to be in the format of an unsigned 32-bit integer (uint32)."
 const ArticleNotFoundErrorMessage = "Article not found"
+const ArticleTitleErrorMessage = "Article title must be between 3 and 200 characters."