How to create image file on google drive having BinaryString or any of FileReader options

Question

I'm passing data to the google application wich published on the web using Post method. Here is the code of the sever side:

function doPost(e) {
  var params, result, responce;
  if(typeof e !== 'undefined')
    params = (e.parameters);
    if (params['type'] == 'get') {
     //do the get;
    }
    else {
    try {
      result = reformat_src(e.parameters);
      responce = process_result(result);
    }
    catch(e) {
      return ContentService.createTextOutput(JSON.stringify(e));
    }
    }
    return ContentService.createTextOutput(JSON.stringify(responce));

}

function reformat_src(request) {
  var prop, obj;
  obj = {};
  for (prop in request) {
    obj[prop] = request[prop][0];
  }
  return obj;
}

In process_result function I'm trying to create an image file on google drive

function process_result(result) {
  var folder;
  folder = DriveApp.getRootFolder();
  folder.createFile('test', result['blob'], MimeType.PNG);
}

I know that result['blob'] contains the png file that I've got with

var reader = new FileReader();
reader.readAsBinaryString(f);

But I failed to create a file. Does anybody know how to create an image file having data from FileReader? I can pass to GAS any of type:
readAsBinaryString
readAsText
readAsDataURL
readAsArrayBuffer Thank you in advance!

Answer 1

As usual I found answer by myself. I need to use readAsDataURL and this function:

function uploadArquivoParaDrive(base64Data, nomeArq, idPasta) {
  try{
    var splitBase = base64Data.split(','),
        type = splitBase[0].split(';')[0].replace('data:','');

    var byteCharacters = Utilities.base64Decode(splitBase[1]);
    var ss = Utilities.newBlob(byteCharacters, type);
    ss.setName(nomeArq);

    var file = DriveApp.getFolderById(idPasta).createFile(ss);

    return file.getName();
  }catch(e){
    return 'Erro: ' + e.toString();
  }
}

found here