如何在使用Meteor Edgee:SlingShot包时修改上传前的文件名

meteor add edgee:slingshot

Slingshot.fileRestrictions("myFileUploads", {
  allowedFileTypes: ["image/png", "image/jpeg", "image/gif"],
  maxSize: 10 * 1024 * 1024 // 10MB
});

Slingshot.createDirective("myFileUploads", Slingshot.S3Storage, {
  bucket: "my-bucket",
  acl: "public-read",
  authorize: function () {
    // 鉴权逻辑
    return true;
  },
  key: function (file) {
    // 生成文件名的逻辑
    var fileName = "myPrefix-" + file.name;
    return fileName;
  }
});

Template.myTemplate.events({
  "change #fileInput": function (event, template) {
    var file = event.target.files[0];
    if (file) {
      var uploader = new Slingshot.Upload("myFileUploads");
      uploader.send(file, function (error, downloadUrl) {
        if (error) {
          // 处理上传错误
        } else {
          // 处理上传成功
        }
      });
    }
  }
});