feat(thumb): support output webp thumbnails for vips generator （#2657）

pkg/thumb/ffmpeg.go

@@ -41,7 +41,7 @@ func (f *FfmpegGenerator) Generate(ctx context.Context, es entitysource.EntitySo
 	tempOutputPath := filepath.Join(
 		util.DataPath(f.settings.TempPath(ctx)),
 		thumbTempFolder,
-		fmt.Sprintf("thumb_%s.%s", uuid.Must(uuid.NewV4()).String(), f.settings.ThumbEncode(ctx).Format),
+		fmt.Sprintf("thumb_%s.png", uuid.Must(uuid.NewV4()).String()),
 	)
 
 	if err := util.CreatNestedFolder(filepath.Dir(tempOutputPath)); err != nil {

pkg/thumb/libreoffice.go

@@ -69,10 +69,9 @@ func (l *LibreOfficeGenerator) Generate(ctx context.Context, es entitysource.Ent
 	}
 
 	// Convert the document to an image
-	encode := l.settings.ThumbEncode(ctx)
 	cmd := exec.CommandContext(ctx, l.settings.LibreOfficePath(ctx), "--headless",
 		"--nologo", "--nofirststartwizard", "--invisible", "--norestore", "--convert-to",
-		encode.Format, "--outdir", tempOutputPath, tempInputPath)
+		"png", "--outdir", tempOutputPath, tempInputPath)
 
 	// Redirect IO
 	var stdErr bytes.Buffer
@@ -86,7 +85,7 @@ func (l *LibreOfficeGenerator) Generate(ctx context.Context, es entitysource.Ent
 	return &Result{
 		Path: filepath.Join(
 			tempOutputPath,
-			strings.TrimSuffix(filepath.Base(tempInputPath), filepath.Ext(tempInputPath))+"."+encode.Format,
+			strings.TrimSuffix(filepath.Base(tempInputPath), filepath.Ext(tempInputPath))+".png",
 		),
 		Continue: true,
 		Cleanup:  []func(){func() { _ = os.RemoveAll(tempOutputPath) }},

pkg/thumb/vips.go

@@ -38,8 +38,8 @@ func (v *VipsGenerator) Generate(ctx context.Context, es entitysource.EntitySour
 
 	outputOpt := ".png"
 	encode := v.settings.ThumbEncode(ctx)
-	if encode.Format == "jpg" {
-		outputOpt = fmt.Sprintf(".jpg[Q=%d]", encode.Quality)
+	if encode.Format == "jpg" || encode.Format == "webp" {
+		outputOpt = fmt.Sprintf(".%s[Q=%d]", encode.Format, encode.Quality)
 	}
 
 	input := "[descriptor=0]"