more fixes

resize/resize.go

@@ -0,0 +1,25 @@
+package resize
+
+import (
+	"bytes"
+	"github.com/nfnt/resize"
+	i "image"
+	"image/jpeg"
+	_ "image/png"
+)
+
+func Shrink(image string, maxSize uint, quality int) (string, error) {
+	img, _, err := i.Decode(bytes.NewReader([]byte(image)))
+	if err != nil {
+		return "", err
+	}
+
+	resizedImg := resize.Thumbnail(maxSize, maxSize, img, resize.Lanczos3)
+	var buffer bytes.Buffer
+	err = jpeg.Encode(&buffer, resizedImg, &jpeg.Options{Quality: quality})
+	if err != nil {
+		return "", err
+	}
+
+	return buffer.String(), nil
+}