feat(user): add user email duplication check

internal/repo/user/user_backyard_repo.go

@@ -89,6 +89,17 @@ func (ur *userBackyardRepo) GetUserInfo(ctx context.Context, userID string) (use
 	return
 }
 
+// GetUserInfoByEmail get user info
+func (ur *userBackyardRepo) GetUserInfoByEmail(ctx context.Context, email string) (user *entity.User, exist bool, err error) {
+	userInfo := &entity.User{}
+	exist, err = ur.data.DB.Where("e_mail = ?", email).
+		Where("status != ?", entity.UserStatusDeleted).Get(userInfo)
+	if err != nil {
+		err = errors.InternalServer(reason.DatabaseError).WithError(err).WithStack()
+	}
+	return
+}
+
 // GetUserPage get user page
 func (ur *userBackyardRepo) GetUserPage(ctx context.Context, page, pageSize int, user *entity.User,
 	usernameOrDisplayName string, isStaff bool) (users []*entity.User, total int64, err error) {

internal/repo/user/user_repo.go

@@ -151,7 +151,8 @@ func (ur *userRepo) GetByUsername(ctx context.Context, username string) (userInf
 // GetByEmail get user by email
 func (ur *userRepo) GetByEmail(ctx context.Context, email string) (userInfo *entity.User, exist bool, err error) {
 	userInfo = &entity.User{}
-	exist, err = ur.data.DB.Where("e_mail = ?", email).Get(userInfo)
+	exist, err = ur.data.DB.Where("e_mail = ?", email).
+		Where("status != ?", entity.UserStatusDeleted).Get(userInfo)
 	if err != nil {
 		err = errors.InternalServer(reason.DatabaseError).WithError(err).WithStack()
 	}

internal/service/user_backyard/user_backyard.go

@@ -25,6 +25,7 @@ import (
 type UserBackyardRepo interface {
 	UpdateUserStatus(ctx context.Context, userID string, userStatus, mailStatus int, email string) (err error)
 	GetUserInfo(ctx context.Context, userID string) (user *entity.User, exist bool, err error)
+	GetUserInfoByEmail(ctx context.Context, email string) (user *entity.User, exist bool, err error)
 	GetUserPage(ctx context.Context, page, pageSize int, user *entity.User,
 		usernameOrDisplayName string, isStaff bool) (users []*entity.User, total int64, err error)
 	AddUser(ctx context.Context, user *entity.User) (err error)
@@ -103,6 +104,14 @@ func (us *UserBackyardService) UpdateUserRole(ctx context.Context, req *schema.U
 
 // AddUser add user
 func (us *UserBackyardService) AddUser(ctx context.Context, req *schema.AddUserReq) (err error) {
+	_, has, err := us.userRepo.GetUserInfoByEmail(ctx, req.Email)
+	if err != nil {
+		return err
+	}
+	if has {
+		return errors.BadRequest(reason.EmailDuplicate)
+	}
+
 	hashPwd, err := bcrypt.GenerateFromPassword([]byte(req.Password), bcrypt.DefaultCost)
 	if err != nil {
 		return err