resize preview images on upload

controllers/shopItemController.go

@@ -68,6 +68,9 @@ func (rc *shopItemController) GetById(c *gin.Context) {
 	ReplyOK(c, shopItem)
 }
 
+// this currently creates quite big preview images
+// workaround is running the following command in the uploads folder:
+// for file in *.png; do convert "$file" -resize 35% "$file"; done
 func (rc *shopItemController) NewShopItemFromForm(ctx *gin.Context) (models.ShopItem, error) {
 	defaultImagePath := "static/img/zine.jpg"
 	name := ctx.PostForm("name")
@@ -106,6 +109,14 @@ func (rc *shopItemController) NewShopItemFromForm(ctx *gin.Context) (models.Shop
 			if err != nil {
 				fmt.Println("Error during pdftoppm: ", err.Error())
 			}
+
+			cmd2 := exec.Command("convert", dstImage, "-resize", "35%", dstImage)
+			_, err = cmd2.Output()
+
+			if err != nil {
+				fmt.Println("Error during resizing preview image: ", err.Error())
+			}
+
 		}
 	} else {
 		fmt.Println(err)
@@ -365,6 +376,13 @@ func (rc *shopItemController) AddItemsHandler(c *gin.Context) {
 			fmt.Println("Error during pdftoppm: ", err.Error())
 		}
 
+		cmd2 := exec.Command("convert", dstImage, "-resize", "35%", dstImage)
+		_, err = cmd2.Output()
+
+		if err != nil {
+			fmt.Println("Error during resizing preview image: ", err.Error())
+		}
+
 		category, err := models.ParseCategory("Zine")
 		if err != nil {
 			errorHandler(err)