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)

flake.nix

@@ -20,6 +20,7 @@
         go
         gotools
         poppler_utils #get first pdf page to png
+        imagemagick
         tailwindcss
       ];
     };
@@ -71,6 +72,7 @@
           environment.systemPackages = [ 
             zineshop-pkg
             pkgs.poppler_utils #get first pdf page to png
+            pkgs.imagemagick
           ];
 
           systemd.tmpfiles.rules = [
@@ -100,7 +102,7 @@
               WorkingDirectory = "/var/lib/zineshop";
               ExecStart = pkgs.writeScript "start-zineshop" ''
                 #! ${pkgs.bash}/bin/bash
-                PATH="$PATH:${lib.makeBinPath [ pkgs.poppler_utils ]}"
+                PATH="$PATH:${lib.makeBinPath [ pkgs.poppler_utils pkgs.imagemagick ]}"
                 ${zineshop-pkg}/bin/zineshop
               '';
               Restart = "on-failure";