from flask import Flask, redirect, request, session, url_for

from authlib.integrations.flask_client import OAuth

app = Flask(__name__)

app.secret_key = "supersecretkey"

oauth = OAuth(app)

google = oauth.register(

name='google',

client_id='your-client-id',

client_secret='your-client-secret',

access_token_url='https://accounts.google.com/o/oauth2/token',

authorize_url='https://accounts.google.com/o/oauth2/auth',

api_base_url='https://www.googleapis.com/oauth2/v1/',

client_kwargs={'scope': 'openid profile email'}

)

@app.route('/')

def index():

if 'user' in session:

return f"Welcome {session['user']['name']}!"

return redirect(url_for('login'))

@app.route('/login')

def login():

redirect_uri = url_for('authorize', _external=True)

return google.authorize_redirect(redirect_uri)

@app.route('/authorize')

def authorize():

token = google.authorize_access_token()

user = google.parse_id_token(token)

session['user'] = user

return redirect('/')

@app.route('/logout')

def logout():

session.pop('user', None)

return redirect('/')

if __name__ == '__main__':

app.run(debug=True)

]]>