port template engine

utils/error.go

@@ -14,7 +14,7 @@ func RenderError(c *fiber.Ctx, code int) error {
 		if code != 0 {
 			codeStr = strconv.Itoa(code)
 		}
-		img, _ := static.GetFiles().ReadFile("img/error-" + codeStr + ".png")
+		img, _ := ReadFile("img/error-"+codeStr+".png", static.GetFiles())
 		c.Set("Content-Type", "image/png")
 		return c.Status(code).Send(img)
 	} else {

utils/readFile.go

@@ -0,0 +1,15 @@
+package utils
+
+import (
+	"io"
+	"io/fs"
+)
+
+func ReadFile(path string, fs fs.FS) ([]byte, error) {
+	file, err := fs.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	return io.ReadAll(file)
+}