Uploading Local Files to Google Drive without Authorization using HTML Form

This is a sample script for uploading local file to Google Drive without the authorization using HTML form. A selected file in your local PC using HTML form is uploaded to Google Drive and saved to Google Drive.

When you use this, at first, please deploy Web Apps. The script is doPost() of following scripts.

Script : Google Apps Script

function doPost(e) {
  var data = Utilities.base64Decode(e.parameters.data);
  var blob = Utilities.newBlob(data, e.parameters.mimetype, e.parameters.filename);
  DriveApp.createFile(blob);
  var output = HtmlService.createHtmlOutput("<b>Done!</b>");
  output.setXFrameOptionsMode(HtmlService.XFrameOptionsMode.ALLOWALL);
  return output;
  // return ContentService.createTextOutput("Done.") <--- Here, an error occurred.
}

Flow :

Retrieve data, filename and mimetype as e.parameters.data, e.parameters.filename and e.parameters.mimetype, respectively.
Decode the data using Utilities.base64Decode().
Create blob using Utilities.newBlob().
Create the file in the root folder of Google Drive.

Script : HTML

https://script.google.com/macros/s/#####/exec is the URL obtained when the Web Apps was deployed. Please replace it to your Web Apps URL. You can open this HTML for the browser of your local PC.

<!DOCTYPE html>
<html>

<head>
    <title>Sample script for uploading file to Google Drive without authorization</title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.js"></script>
</head>

<body>
    <form action="https://script.google.com/macros/s/#####/exec" id="form" method="post">
        Upload a file
        <div id="data"></div>
        <input name="file" id="uploadfile" type="file">
        <input id="submit" type="submit">
    </form>
    <script>
    $('#uploadfile').on("change", function() {
        var file = this.files[0];
        var fr = new FileReader();
        fr.fileName = file.name;
        fr.onload = function(e) {
            e.target.result
            html = '<input type="hidden" name="data" value="' + e.target.result.replace(/^.*,/, '') + '" >';
            html += '<input type="hidden" name="mimetype" value="' + e.target.result.match(/^.*(?=;)/)[0] + '" >';
            html += '<input type="hidden" name="filename" value="' + e.target.fileName + '" >';
            $("#data").empty().append(html);
        }
        fr.readAsDataURL(file);
    });
    </script>
</body>

</html>

Flow :

Using FileReader(), retrieve base64 encoded file, filename and mimetype.
Add input with type="hidden" to #form as text data.
- replace(/^.*,/, '') is used for removing a header of encoded data.
- match(/^.*(?=;)/)[0] is used for retrieving mimetype of uploading file.
When a submit button is clicked, the base64 data is sent to doPost() of GAS.

Note :

In order to use this, after the script is modified, please redeploy Web Apps as a new version. By this, the latest script is reflected to Web Apps.
This sample script can upload one file. If you want to upload several files, please modify script. var file = this.files[0]; means the selected first file. When there are some files, it is files[1], files[2] .....

Reference :

For downloading files on Google Drive to local PC, I have already published here.

Updated:

October 22, 2019: By Max-Makhrov's comment, the error in the script was removed.

samnangcattor/submit.md

Uploading Local Files to Google Drive without Authorization using HTML Form

Script : Google Apps Script

Flow :

Script : HTML

Flow :

Note :

Reference :

Updated: