Add support for rar extraction

internal/universal/check.go

@@ -81,6 +81,16 @@ func getContentMimeType(filePath string) string {
 		return "application/zip"
 	case ".txt":
 		return "text/plain"
+	case ".srt":
+		return "text/srt"
+	case ".jpg":
+		return "image/jpeg"
+	case ".png":
+		return "image/png"
+	case ".gif":
+		return "image/gif"
+	case ".webp":
+		return "image/webp"
 	default:
 		return "application/octet-stream"
 	}