lone-services/services/analysis/internal/callback/image.go

package callback

import (
	"bytes"
	"fmt"
	"strings"

	"github.com/disintegration/imaging"
)

func Rotate90Bytes(data []byte, ext string) ([]byte, error) {
	img, err := imaging.Decode(bytes.NewReader(data))
	if err != nil {
		return nil, err
	}
	img = imaging.Rotate90(img)

	format := imaging.JPEG
	if strings.EqualFold(ext, ".png") {
		format = imaging.PNG
	}
	var buf bytes.Buffer
	if err = imaging.Encode(&buf, img, format); err != nil {
		return nil, fmt.Errorf("encode image: %w", err)
	}
	return buf.Bytes(), nil
}