move server to server directory.

server/pkg/utils/image.go

@@ -0,0 +1,39 @@
+package utils
+
+import (
+	"bytes"
+	"encoding/base64"
+	"image"
+	"image/jpeg"
+	"image/png"
+)
+
+func CreatePNGImage(img *image.RGBA) ([]byte, error) {
+	out := new(bytes.Buffer)
+	err := png.Encode(out, img)
+	if err != nil {
+		return nil, err
+	}
+
+	return out.Bytes(), nil
+}
+
+func CreateJPGImage(img *image.RGBA, quality int) ([]byte, error) {
+	out := new(bytes.Buffer)
+	err := jpeg.Encode(out, img, &jpeg.Options{Quality: quality})
+	if err != nil {
+		return nil, err
+	}
+
+	return out.Bytes(), nil
+}
+
+func CreatePNGImageURI(img *image.RGBA) (string, error) {
+	data, err := CreatePNGImage(img)
+	if err != nil {
+		return "", err
+	}
+
+	uri := "data:image/png;base64," + base64.StdEncoding.EncodeToString(data)
+	return uri, nil
+}