feat: users & authentication implementation

useCases/GetUserByUsernameUseCase.go

@@ -0,0 +1,21 @@
+package useCases
+
+import (
+	. "GohCMS2/adapters/secondary/gateways"
+	. "GohCMS2/domain/user"
+	"gorm.io/gorm"
+)
+
+type GetUserByUsernameUseCase struct {
+	userRepository UserRepository
+}
+
+func NewGetUserByUsernameUseCase(db *gorm.DB) *GetUserByUsernameUseCase {
+	return &GetUserByUsernameUseCase{
+		userRepository: *NewUserRepository(db),
+	}
+}
+
+func (g *GetUserByUsernameUseCase) GetUserByUsername(username string) (User, error) {
+	return g.userRepository.GetByUsername(username)
+}