问通过Google Docs插件应用程序脚本将文件从服务器下载到本地计算机

EN

 function downloadOutput(selectedFile){
  var mimeType;
  var template = new Template();

  var documentProperties = PropertiesService.getDocumentProperties();
  var jobFolderPath = replaceWhiteSpace(documentProperties.getProperty('JOB_FOLDER_PATH'));
  var pathParts = jobFolderPath.split("/");
  var outputFolderName = pathParts.pop();
  var rootFolderID = getWriterRootFolder();

  var filename = replaceWhiteSpace(selectedFile);
  if (selectedFile.includes('.pdf')){
    mimeType = 'application/pdf';
  }
  else if(selectedFile.includes('.epub')){
    mimeType = 'application/epub+zip';
  }
  else if (selectedFile.includes('.jpg')){
    mimeType = 'image/jpeg';
  }
  else if(selectedFile.includes('.png')){
    mimeType = 'image/png';
  }
  else if(selectedFile.includes('.zip')){
    mimeType= 'application/zip';
  }
  else if(selectedFile.includes('.mobi')){
    mimeType= 'application/x-mobipocket-ebook';
  }
  else if(selectedFile.includes('.indd')){ 
    mimeType = 'application/x-indesign';
  }

  //This is for retrieving the selectedFile from our server.  
  var response = sendRequest(template.server, template.customer, "/api/v2/","GET", "files" + jobFolderPath + "/"+ filename);

  var output = {
    title: selectedFile,
    parents: [{'id':rootFolderID}],
    mimeType: mimeType
  };

  var outputFile = Drive.Files.insert(output, response.getBlob());

  //some tries to get a download from the drive file, but not worked.
  var url = "https://www.googleapis.com/drive/v3/files/" + outputFile.id + "?alt=media&mimeType="+ mimeType;

  var blob = UrlFetchApp.fetch(url, {
    method: "get",
    headers: {"Authorization": "Bearer " + ScriptApp.getOAuthToken()},
    muteHttpExceptions: true
  });

  var rrr = UrlFetchApp.fetch(outputFile.downloadUrl, 
  { 
    method :"get",
      headers: {"Authorization": "Bearer " + ScriptApp.getOAuthToken()    }
  });
}