refactor: extract media conversion logic to helper

helper/media_convert.go

@@ -0,0 +1,93 @@
+package helper
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+
+	"github.com/google/uuid"
+)
+
+func ConvertImageToSticker(imgData []byte, exifPath string) ([]byte, error) {
+	webpPath := filepath.Join("temp", fmt.Sprintf("%s.webp", uuid.New().String()))
+	defer os.Remove(webpPath)
+
+	convertCmd := exec.Command("convert", "-", "-resize", "512x512", "-background", "none", "-compose", "Copy", "-gravity", "center", "-extent", "512x512", "-quality", "100", "png:-")
+	convertCmd.Stdin = bytes.NewReader(imgData)
+	var convertBuf bytes.Buffer
+	convertCmd.Stdout = &convertBuf
+	if err := convertCmd.Run(); err != nil {
+		return nil, fmt.Errorf("convert failed: %w", err)
+	}
+
+	cwebpCmd := exec.Command("cwebp", "-quiet", "-mt", "-exact", "-q", "100", "-m", "6", "-alpha_q", "100", "-o", "-", "--", "-")
+	cwebpCmd.Stdin = &convertBuf
+	var cwebpBuf bytes.Buffer
+	cwebpCmd.Stdout = &cwebpBuf
+	if err := cwebpCmd.Run(); err != nil {
+		return nil, fmt.Errorf("cwebp failed: %w", err)
+	}
+
+	tmpWebp := webpPath + ".tmp.webp"
+	if err := os.WriteFile(tmpWebp, cwebpBuf.Bytes(), 0644); err != nil {
+		return nil, err
+	}
+	defer os.Remove(tmpWebp)
+
+	webpmuxCmd := exec.Command("webpmux", "-set", "exif", exifPath, tmpWebp, "-o", webpPath)
+	if err := webpmuxCmd.Run(); err != nil {
+		return nil, fmt.Errorf("webpmux failed: %w", err)
+	}
+
+	return os.ReadFile(webpPath)
+}
+
+func ConvertVideoToSticker(vidData []byte, exifPath string) ([]byte, error) {
+	webpPath := filepath.Join("temp", fmt.Sprintf("%s.webp", uuid.New().String()))
+	defer os.Remove(webpPath)
+
+	tmpWebp := webpPath + ".tmp.webp"
+	defer os.Remove(tmpWebp)
+
+	ffmpegCmd := exec.Command("ffmpeg",
+		"-y", "-hide_banner", "-loglevel", "error",
+		"-i", "pipe:0", "-f", "mp4",
+		"-ss", "00:00:00", "-t", "00:00:15",
+		"-vf", "fps=10,scale=720:-1:flags=lanczos:force_original_aspect_ratio=increase,crop=512:512,pad=512:512:(ow-iw)/2:(oh-ih)/2:color=#00000000,setsar=1",
+		"-compression_level", "6",
+		"-q:v", "60", "-loop", "0",
+		"-preset", "picture", "-an", "-fps_mode", "auto",
+		"-f", "webp", tmpWebp,
+	)
+	ffmpegCmd.Stdin = bytes.NewReader(vidData)
+	if err := ffmpegCmd.Run(); err != nil {
+		return nil, fmt.Errorf("ffmpeg failed: %w", err)
+	}
+
+	webpmuxCmd := exec.Command("webpmux", "-set", "exif", exifPath, tmpWebp, "-o", webpPath)
+	if err := webpmuxCmd.Run(); err != nil {
+		return nil, fmt.Errorf("webpmux failed: %w", err)
+	}
+
+	return os.ReadFile(webpPath)
+}
+
+func RewriteStickerExif(webpData []byte, exifPath string) ([]byte, error) {
+	webpPath := filepath.Join("temp", fmt.Sprintf("%s.webp", uuid.New().String()))
+	defer os.Remove(webpPath)
+
+	tmpWebp := webpPath + ".tmp.webp"
+	if err := os.WriteFile(tmpWebp, webpData, 0644); err != nil {
+		return nil, err
+	}
+	defer os.Remove(tmpWebp)
+
+	webpmuxCmd := exec.Command("webpmux", "-set", "exif", exifPath, tmpWebp, "-o", webpPath)
+	if err := webpmuxCmd.Run(); err != nil {
+		return nil, fmt.Errorf("webpmux failed: %w", err)
+	}
+
+	return os.ReadFile(webpPath)
+}