disable /register if a user exist

controllers/userController.go

@@ -2,7 +2,6 @@ package controllers
 
 import (
 	"fmt"
-	"math/rand"
 	"net/http"
 
 	"github.com/gin-gonic/gin"
@@ -182,6 +181,38 @@ func (rc *UserController) RegisterView(c *gin.Context) {
 	c.HTML(http.StatusOK, "register.html", data)
 }
 
+func (rc *UserController) InitAdmin(c *gin.Context) {
+	isEmpty, err := repositories.Users.IsEmpty()
+
+	if err != nil {
+		data := gin.H{
+			"error":   err,
+			"success": "",
+		}
+
+		c.HTML(http.StatusInternalServerError, "error.html", data)
+		return
+	}
+
+	if !isEmpty {
+		data := gin.H{
+			"error":   "Registration is closed",
+			"success": "",
+		}
+
+		c.HTML(http.StatusInternalServerError, "error.html", data)
+		return
+
+	}
+
+	data := gin.H{
+		"error":   "",
+		"success": "",
+	}
+
+	c.HTML(http.StatusOK, "register.html", data)
+}
+
 func (rc *UserController) ResetView(c *gin.Context) {
 	shopItems, _ := repositories.ShopItems.GetAll()
 

main.go

@@ -87,6 +87,7 @@ func main() {
 		//write middleware that redirects to homescreen on register/login/reset for logged in users
 		viewRoutes.GET("/login", userController.LoginView)
 		viewRoutes.GET("/logout", userController.Logout)
+		viewRoutes.GET("/register", userController.InitAdmin)
 		viewRoutes.GET("/register/:token", userController.RegisterView)
 		viewRoutes.GET("/passwordreset", userController.ResetView)
 		viewRoutes.GET("/additem", authValidator.RequireAuth, shopItemController.AddItemView)

repositories/userRepository.go

@@ -1,15 +1,16 @@
 package repositories
 
-import(
+import (
 	"gorm.io/gorm"
 
 	"git.dynamicdiscord.de/kalipso/zineshop/models"
-)	
+)
 
 type UserRepository interface {
-	Create(models.User) (models.User, error)	
+	Create(models.User) (models.User, error)
 	GetByEmail(string) (models.User, error)
 	GetById(interface{}) (models.User, error)
+	IsEmpty() (bool, error)
 }
 
 type GORMUserRepository struct {
@@ -22,7 +23,7 @@ func NewGORMUserRepository(db *gorm.DB) UserRepository {
 	}
 }
 
-func (u *GORMUserRepository) Create(user models.User) (models.User, error)	{
+func (u *GORMUserRepository) Create(user models.User) (models.User, error) {
 	result := u.DB.Create(&user)
 
 	if result.Error != nil {
@@ -53,3 +54,18 @@ func (u *GORMUserRepository) GetById(id interface{}) (models.User, error) {
 
 	return user, nil
 }
+
+func (u *GORMUserRepository) IsEmpty() (bool, error) {
+	var user models.User
+	result := u.DB.First(&user)
+
+	if result.Error != nil {
+		if result.Error == gorm.ErrRecordNotFound {
+			return true, nil
+		} else {
+			return false, result.Error
+		}
+	}
+
+	return false, nil
+}