crud implemented

internal/convert/service.go

@@ -1,15 +1,48 @@
 package convert
 
+import (
+	"github.com/davidbyttow/govips/v2/vips"
+	"io"
+)
+
 type service struct{}
 
 func newService() *service {
 	return &service{}
 }
 
-func (s *service) ConvertToJpeg() error {
-	return nil
-}
+func (s *service) ConvertAndSave(imageData []byte, fullWriter, thumbWriter io.Writer) error {
+	img, err := vips.NewImageFromBuffer(imageData)
+	if err != nil {
+		return err
+	}
+	defer img.Close()
+
+	//force convert even it is already a jpeg image
+	converted, _, err := img.ExportJpeg(&vips.JpegExportParams{
+		StripMetadata: true,
+		Quality:       90,
+	})
+
+	if _, err = fullWriter.Write(converted); err != nil {
+		return err
+	}
+
+	if err = img.Thumbnail(300, 300, vips.InterestingNone); err != nil {
+		return err
+	}
+
+	thumbnail, _, err := img.ExportJpeg(&vips.JpegExportParams{
+		StripMetadata: true,
+		Quality:       80,
+	})
+	if err != nil {
+		return err
+	}
+
+	if _, err = thumbWriter.Write(thumbnail); err != nil {
+		return err
+	}
 
-func (s *service) MakeThumbnail() error {
 	return nil
 }