feat: Authors feature backend (and upgraded deprecated mods)

internal/infrastructure/useCases/GetMyAuthor.go

@@ -0,0 +1,25 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/author"
+	"errors"
+)
+
+type GetMyAuthorUseCase struct {
+	authors author.Repository
+}
+
+func NewGetMyAuthorUseCase(authors author.Repository) *GetMyAuthorUseCase {
+	return &GetMyAuthorUseCase{authors: authors}
+}
+
+func (u *GetMyAuthorUseCase) Get(userID uint32) (*author.Author, error) {
+	found, err := u.authors.GetByUserID(userID)
+	if errors.Is(err, author.ErrAuthorNotFound) {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &found, nil
+}