flask_google_oauth2_login_with_authlib_client.py

1from flask import Flask, url_for, session
2from flask import redirect
3from authlib.integrations.flask_client import OAuth
4
5app = Flask(__name__)
6app.secret_key = 'development'
7
8oauth = OAuth(app)
9oauth.register(
10    name='google',
11    client_id='YOUR_GOOGLE_CLIENT_ID',
12    client_secret='YOUR_GOOGLE_CLIENT_SECRET',
13    server_metadata_url='https://accounts.google.com/.well-known/openid-configuration',
14    client_kwargs={
15        'scope': 'openid email profile'
16    }
17)
18
19@app.route('/')
20def homepage():
21    user = session.get('user')
22    if user:
23        return f'Hello, {user["name"]}! <a href="/logout">Logout</a>'
24    return '<a href="/login">Login with Google</a>'
25
26@app.route('/login')
27def login():
28    redirect_uri = url_for('auth', _external=True)
29    return oauth.google.authorize_redirect(redirect_uri)
30
31@app.route('/auth')
32def auth():
33    token = oauth.google.authorize_access_token()
34    user = token.get('userinfo')
35    if user:
36        session['user'] = user
37    return redirect('/')
38
39@app.route('/logout')
40def logout():
41    session.pop('user', None)
42    return redirect('/')
43
44if __name__ == '__main__':
45    app.run(debug=True)