Initial commit

internal/application/services/user_service.go

@@ -0,0 +1,145 @@
+package services
+
+import (
+	"58team_blog/internal/application/commands"
+	"58team_blog/internal/application/common"
+	"58team_blog/internal/application/mapper"
+	"58team_blog/internal/application/queries"
+	"58team_blog/internal/domain/entities"
+	"58team_blog/internal/domain/repository"
+	"errors"
+	"fmt"
+)
+
+type UserService struct {
+	repo repository.UsersRepository
+}
+
+func NewUserService(repo repository.UsersRepository) UserService {
+	return UserService{
+		repo: repo,
+	}
+}
+
+func (s *UserService) Create(cmd commands.CreateUserCommand) (*common.UserResult, error) {
+	// Check user with given name exists
+	{
+		user, err := s.repo.FindByName(cmd.Username)
+		if err != nil {
+			return nil, err
+		}
+
+		if user != nil {
+			return nil, fmt.Errorf("User: %s already exists", user.UserName)
+		}
+	}
+
+	// Create new user
+	user, err := entities.CreateUser(cmd.Username, cmd.Password)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := user.Validate(); err != nil {
+		return nil, err
+	}
+
+	entity, err := s.repo.Create(&user)
+	if err != nil {
+		return nil, err
+	}
+
+	result := mapper.CreateUserResultFromEntity(entity)
+
+	return result, nil
+}
+
+func (s *UserService) FindById(query queries.UserFindByIdQuery) (*queries.UserFindByIdResult, error) {
+	entity, err := s.repo.FindById(query.Id)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := entity.Validate(); err != nil {
+		return nil, err
+	}
+
+	result := mapper.CreateUserFindByIdResultFromEntity(entity)
+
+	return result, nil
+}
+
+func (s *UserService) FindByName(query queries.UserFindByNameQuery) (*queries.UserFindByNameResult, error) {
+	entity, err := s.repo.FindByName(query.Name)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := entity.Validate(); err != nil {
+		return nil, err
+	}
+
+	result := mapper.CreateUserFindByNameResultFromEntity(entity)
+	return result, nil
+}
+
+func (s *UserService) GetAll() (*queries.UserGetAllResult, error) {
+	entityList, err := s.repo.GetAll()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, e := range entityList {
+		if err := e.Validate(); err != nil {
+			return nil, err
+		}
+	}
+
+	result := mapper.CreateUserGetAllResultFromEntity(entityList)
+	return result, nil
+}
+
+func (s *UserService) Update(cmd commands.UpdateUserCommand) (*common.UserResult, error) {
+	entity, err := s.repo.FindById(cmd.Id)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := entity.Validate(); err != nil {
+		return nil, err
+	}
+
+	if cmd.Username != entity.UserName {
+		return nil, errors.New("You cannot change user name")
+	}
+
+	entity.Password = cmd.Password
+
+	if err := entity.Validate(); err != nil {
+		return nil, err
+	}
+
+	if err := s.repo.Update(entity); err != nil {
+		return nil, err
+	}
+
+	result := mapper.CreateUserResultFromEntity(entity)
+	return result, nil
+}
+
+func (s *UserService) Delete(cmd commands.DeleteUserCommand) error {
+	entity, err := s.repo.FindById(cmd.Id)
+	if err != nil {
+		return err
+	}
+
+	if err := entity.Validate(); err != nil {
+		return err
+	}
+
+	if err := s.repo.Delete(entity.Id); err != nil {
+		return err
+	}
+
+	return nil
+}