Code to convert doc files to pdf using google drive

convert_doc_to_pdf.py

# License: UNLICENSE
import io
import json
import string
import random
import mimetypes
from pathlib import Path

import magic
from httplib2 import Http
from oauth2client import file, client, tools
from googleapiclient.discovery import build
from googleapiclient.errors import HttpError
from googleapiclient.http import MediaIoBaseUpload, MediaIoBaseDownload


def get_random_string(n):
    res = ''.join(random.choices(string.ascii_uppercase +
                                 string.digits, k=n))

    return res

def export_pdf(file_id, service):
    request = service.files().export_media(
        fileId=file_id, mimeType="application/pdf"
    )
    file = io.BytesIO()
    downloader = MediaIoBaseDownload(file, request)
    done = False
    while done is False:
        status, done = downloader.next_chunk()
        print(f"Download {int(status.progress() * 100)}.")

    return file.getvalue()

def upload_file(content, service):
    mimetype = magic.from_buffer(content, mime=True)
    ext = mimetypes.guess_extension(mimetype, strict=True)
    fname = get_random_string(7) + ext
    file_metadata = {
        "name": fname,
        "mimeType": "application/vnd.google-apps.spreadsheet",
    }
    iofile = io.BytesIO(content)
    media = MediaIoBaseUpload(iofile, mimetype=mimetype)
    file = (
        service.files()
               .create(body=file_metadata, media_body=media, fields="id")
               .execute()
    )
    return file.get("id")

def delete_file(file_id, service):
    # directly deleting doesn't work and I don't understand why
    #resp = service.files().delete(fileId=file_id, supportsAllDrives=True)

    body_value = {'trashed': True}
    resp = service.files().update(fileId=file_id, body=body_value).execute()
    resp = service.files().emptyTrash().execute()

def get_service():
    SCOPES = 'https://www.googleapis.com/auth/drive'
    store = file.Storage('storage.json')
    creds = store.get()
    if not creds or creds.invalid:
        flow = client.flow_from_clientsecrets('credentials.json', SCOPES)
        creds = tools.run_flow(flow, store)
    service = build('drive', 'v3', http=creds.authorize(Http()))
    return service

def convert(from_file, to_file, service=None):
    if service is None:
        service = get_service()

    from_bytes = Path(from_file).read_bytes()

    print('uploading file')
    file_id = upload_file(from_bytes, service)


    print('downloading file as pdf')
    pdf_content = export_pdf(file_id, service)

    Path(to_file).write_bytes(pdf_content)

    print('deleting file', file_id)
    delete_file(file_id, service)

if __name__ == "__main__":
    convert('ms1288-2007.doc', 'ms1288-2007.pdf')

requirements.in

python-magic
httplib2
google-api-python-client
google-auth-httplib2
google-auth-oauthlib

WARNING: Deleting leftover files was not working due to (what I am guessing are) permission issues, So.. I move them to trash and empty the thrash.