Resize image while downloading and create image directory

src/internal/web/download.go

@@ -1,19 +1,33 @@
 package web
 
 import (
+	"image"
+	"image/jpeg"
 	"io"
 	"net/http"
 	"os"
+	"path"
+
+	"github.com/nfnt/resize"
 )
 
 // Download used for downloading file
 var Download = func(srcURL, dest string) error {
+	if err := createDirectory(dest); err != nil {
+		return err
+	}
+
 	resp, err := http.Get(srcURL)
 	if err != nil {
 		return err
 	}
 	defer resp.Body.Close()
 
+	img, err := resizeImage(resp.Body)
+	if err != nil {
+		return err
+	}
+
 	// Create the file
 	file, err := os.Create(dest)
 	if err != nil {
@@ -21,10 +35,19 @@ var Download = func(srcURL, dest string) error {
 	}
 	defer file.Close()
 
-	// Write from the net to the file
-	_, err = io.Copy(file, resp.Body)
-	if err != nil {
-		return err
-	}
-	return nil
+	return jpeg.Encode(file, img, nil)
+}
+
+// createDirectory creates the destination directory
+func createDirectory(dest string) error {
+	return os.MkdirAll(path.Dir(dest), os.ModePerm)
+}
+
+func resizeImage(img io.Reader) (image.Image, error) {
+	image, _, err := image.Decode(img)
+	if err != nil {
+		return nil, err
+	}
+
+	return resize.Resize(300, 0, image, resize.Lanczos3), nil
 }