aa.py

import os
os.environ['OAUTHLIB_INSECURE_TRANSPORT'] = '1'
import json 


from flask import Flask, redirect, url_for, request, jsonify
from google.oauth2.credentials import Credentials
from google_auth_oauthlib.flow import InstalledAppFlow
from googleapiclient.discovery import build
import datetime

app = Flask(__name__)

CLIENT_SECRETS_FILE = "credentials.json"
SCOPES = ['https://www.googleapis.com/auth/calendar.readonly']
REDIRECT_URI = "https://nsquarzoni-gcalendar.hf.space/oauth2callback"

flow = InstalledAppFlow.from_client_secrets_file(
 CLIENT_SECRETS_FILE,
 scopes=SCOPES,
 redirect_uri=REDIRECT_URI
)

@app.route('/')
def index():
 credentials = None
 if os.path.exists("token.json") and os.path.getsize("token.json") > 0:
    with open("/app/token.json", 'r') as file:
        data = json.load(file)
    return data
    #credentials = Credentials.from_authorized_user_file("/app/token.json")
    #return '<pre>Already authorized</pre>' 
    #return credentials.jsonify
         
 if not credentials or not credentials.valid:
    authorization_url, state = flow.authorization_url(
    access_type='offline',
    include_granted_scopes='true'
    )
    return redirect(authorization_url)

@app.route('/oauth2callback')
def oauth2callback():
 flow.fetch_token(authorization_response=request.url)
 credentials = flow.credentials
 return credentials.to_json()
 with open("/app/token.json", "w") as file:
    file.write(credentials.to_json())
 with open("/app/token.json", 'r') as file:
    data = json.load(file)
 return data
 service = build('calendar', 'v3', credentials=credentials)
 now = datetime.datetime.utcnow().isoformat() + 'Z'
 end_of_week = (datetime.datetime.utcnow() + datetime.timedelta(days=7)).isoformat() + 'Z'
 events_result = service.events().list(calendarId='primary', timeMin=now, timeMax=end_of_week,
                                       singleEvents=True, orderBy='startTime').execute()
 events = events_result.get('items', [])
 return jsonify(events)

if __name__ == '__main__':
 app.run(port=7860)