update changelog

pkg/utils/file/image.go

@@ -0,0 +1,82 @@
+package file
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/disintegration/imaging"
+	"github.com/dsoprea/go-exif/v3"
+	exifcommon "github.com/dsoprea/go-exif/v3/common"
+)
+
+func GetImage(path string, width, height int) ([]byte, error) {
+	if thumbnail, err := GetThumbnailByOwnerPhotos(path); err == nil {
+		return thumbnail, nil
+	} else {
+		return GetThumbnailByWebPhoto(path, width, height)
+	}
+}
+func GetThumbnailByOwnerPhotos(path string) ([]byte, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	buff := &bytes.Buffer{}
+
+	defer file.Close()
+	offset := 0
+	offsets := []int{12, 30}
+
+	head := make([]byte, 0xffff)
+
+	r := io.TeeReader(file, buff)
+	_, err = r.Read(head)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, offset = range offsets {
+		if _, err = exif.ParseExifHeader(head[offset:]); err == nil {
+			break
+		}
+	}
+
+	im, err := exifcommon.NewIfdMappingWithStandard()
+	if err != nil {
+		return nil, err
+	}
+
+	_, index, err := exif.Collect(im, exif.NewTagIndex(), head[offset:])
+	if err != nil {
+		return nil, err
+	}
+
+	ifd := index.RootIfd.NextIfd()
+	if err != nil {
+		return nil, err
+	}
+	thumbnail, err := ifd.Thumbnail()
+	if err != nil {
+		return nil, err
+	}
+	return thumbnail, nil
+}
+func GetThumbnailByWebPhoto(path string, width, height int) ([]byte, error) {
+	src, err := imaging.Open(path)
+	if err != nil {
+		fmt.Println(err)
+		return nil, err
+	}
+
+	img := imaging.Resize(src, width, 0, imaging.Lanczos)
+
+	f, err := imaging.FormatFromFilename(path)
+	if err != nil {
+		return nil, err
+	}
+	buf := bytes.Buffer{}
+	imaging.Encode(&buf, img, f)
+	return buf.Bytes(), nil
+}