If you want to detect the file type on upload and only allow certain file types to be uploaded, you can modify the `upload()` function to include a check for the file type before uploading it to Google Drive. Here's an example of how you can do this:

```python
import os

def upload():
    """Upload file
    Returns: ID of the file uploaded

    Load pre-authorized user credentials from the environment.
    TODO(developer) - See https://developers.google.com/identity
    for guides on implementing OAuth2 for the application.
    """
    creds, _ = google.auth.default()

    try:
        # create drive api client
        service = build('drive', 'v3', credentials=creds)

        # specify the allowed file types
        allowed_file_types = ['txt', 'pdf', 'docx']

        # get the file extension
        file_name = 'file.bin'
        file_extension = os.path.splitext(file_name)[1][1:]

        # check if the file type is allowed
        if file_extension not in allowed_file_types:
            print(f'File type "{file_extension}" is not allowed.')
            return None

        file_metadata = {
            'name': 'My File',
            'mimeType': 'application/octet-stream'
        }
        media = MediaFileUpload(file_name, mimetype='application/octet-stream',
                                resumable=True)
        # pylint: disable=maybe-no-member
        file = service.files().create(body=file_metadata, media_body=media,
                                      fields='id').execute()
        print(F'File with ID: "{file.get("id")}" has been uploaded.')

    except HttpError as error:
        print(F'An error occurred: {error}')
        file = None

    return file.get('id')
```

In this example, we specify the allowed file types in the `allowed_file_types` list. Then, we get the file extension using `os.path.splitext(file_name)[1][1:]` and check if it's in the `allowed_file_types` list. If it's not, we print an error message and return `None`. Otherwise, we proceed with uploading the file to Google Drive.

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