Upload file to my google drive with Google Apps Script (NO FORM IN GOOGLE)

I believe your goal as follows.

• Your web site is not related to Google account. It’s independent.
• Your web site has a form for uploading a file.
• When users submit the form, you want to upload the file to your Google Drive without the authorization, and want to return the URL of the uploaded file on Google Drive.
• About “Database”, this is your database. You will put the retrieved URL of the file to “Database” at the client side.

In this case, I think that your goal can be achieved using the Web Apps created by Google Apps Script.

Usage:

Please do the following flow.

1. Create new project of Google Apps Script.

Sample script of Web Apps is a Google Apps Script. So please create a project of Google Apps Script.

If you want to directly create it, please access to https://script.new/. In this case, if you are not logged in Google, the log in screen is opened. So please log in to Google. By this, the script editor of Google Apps Script is opened.

2. Prepare script.

Please copy and paste the following script (Google Apps Script) to the script editor. This script is for the Web Apps.

Server side: Google Apps Script

Please set the folder ID that you want to put the file.

function doPost(e) {
  const folderId = "root";  // Or Folder ID which is used for putting the file instead of "root", if you need.

  const blob = Utilities.newBlob(JSON.parse(e.postData.contents), e.parameter.mimeType, e.parameter.filename);
  const file = DriveApp.getFolderById(folderId).createFile(blob);
  const responseObj = {filename: file.getName(), fileId: file.getId(), fileUrl: file.getUrl()};
  return ContentService.createTextOutput(JSON.stringify(responseObj)).setMimeType(ContentService.MimeType.JSON);
}

3. Deploy Web Apps.

1. On the script editor, Open a dialog box by “Publish” -> “Deploy as web app”.
2. Select “Me” for “Execute the app as:”.
   • By this, the script is run as the owner.
3. Select “Anyone, even anonymous” for “Who has access to the app:”.
4. Click “Deploy” button as new “Project version”.
5. Automatically open a dialog box of “Authorization required”.
   1. Click “Review Permissions”.
   2. Select own account.
   3. Click “Advanced” at “This app isn’t verified”.
   4. Click “Go to ### project name ###(unsafe)”
   5. Click “Allow” button.
6. Click “OK”.
7. Copy the URL of Web Apps. It’s like https://script.google.com/macros/s/###/exec.
   • When you modified the Google Apps Script, please redeploy as new version. By this, the modified script is reflected to Web Apps. Please be careful this.

4. Upload a file from client side to server side.

Client side: HTML & Javascript

Please set the URL of your Web Apps to the following script.

<form id="form">
  <input name="file" id="uploadfile" type="file">
  <input name="filename" id="filename" type="text">
  <input id="submit" type="submit">
</form>
<script>
const form = document.getElementById('form');
form.addEventListener('submit', e => {
  e.preventDefault();
  const file = form.file.files[0];
  const fr = new FileReader();
  fr.readAsArrayBuffer(file);
  fr.onload = f => {
    
    const url = "https://script.google.com/macros/s/###/exec";  // <--- Please set the URL of Web Apps.
    
    const qs = new URLSearchParams({filename: form.filename.value || file.name, mimeType: file.type});
    fetch(`${url}?${qs}`, {method: "POST", body: JSON.stringify([...new Int8Array(f.target.result)])})
    .then(res => res.json())
    .then(e => console.log(e))  // <--- You can retrieve the returned value here.
    .catch(err => console.log(err));
  }
});
</script>

• At the client side, when you selected a file from your local PC and push the button, the file is uploaded to your Google Drive by retrieving the data at the Web Apps (server side).

Result:

When above script is run, the following value is returned. From this, you can retrieve the URL of the file.

{
  "filename": "### inputted filename ###",
  "fileId": "###",
  "fileUrl": "https://drive.google.com/file/d/###/view?usp=drivesdk"
}

Note:

• When you modified the script of Web Apps, please redeploy the Web Apps as new version. By this, the latest script is reflected to Web Apps. Please be careful this.
• In above script, the maximum file size is 50 MB. Because in the current stage, the maximum blob size is 50 MB at Google Apps Script.

References:

• Web Apps
• Taking advantage of Web Apps with Google Apps Script