obtaining an oauth.json using client_secret.json

ytapi_ytmusicapi_credentials.py

import json
import google_auth_oauthlib.flow
from urllib.parse import urlparse, parse_qs

SCOPE = 'https://www.googleapis.com/auth/youtube'

# Use the client_secret.json file to identify the application requesting
# authorization. The client ID (from that file) and access scopes are required.
flow = google_auth_oauthlib.flow.Flow.from_client_secrets_file(
    'client_secret.json',
    scopes=[SCOPE])

flow.redirect_uri = 'https://localhost/oauth2callback'

# Generate URL for request to Google's OAuth 2.0 server.
authorization_url, state = flow.authorization_url(
    access_type='offline',
    include_granted_scopes='true')

print(authorization_url)

redirect_uri = input("visit the URL above, authorize and paste the resulting redirect uri from your browser")
parsed_url = urlparse(redirect_uri)
qs = parse_qs(parsed_url.query)

flow = google_auth_oauthlib.flow.Flow.from_client_secrets_file(
    'client_secret.json',
    scopes=[SCOPE],
    state=qs['state'].pop())

flow.redirect_uri = 'https://localhost/oauth2callback'
flow.fetch_token(authorization_response=redirect_uri)

# Store the credentials in a JSON
credentials = flow.credentials
oauth_json = {
    'access_token': credentials.token,
    'refresh_token': credentials.refresh_token,
    'token_uri': credentials.token_uri,
    'client_id': credentials.client_id,
    'client_secret': credentials.client_secret,
    'scopes': credentials.scopes
}
with open('oauth.json', mode="w") as file:
    json.dump(oauth_json, file)