Implement login with Google in Python Flask applications with Authlib

Authlib is a Python library that provides a flexible and customizable authentication and authorization solution for Flask applications. In this article, we will explore how to implement login with Google in a Python Flask application using Authlib.

Setting up Google OAuth credentials

The first step in implementing Google login in your Flask application is to obtain OAuth credentials from the Google API console. You will need to create a new project, enable the Google+ API, and obtain a client ID and client secret.

Installing Authlib

To use Authlib in your Flask application, you will need to install it using pip:

<pre>
pip install authlib
</pre>

Implementing Google login

Once you have obtained your Google OAuth credentials and installed Authlib, you can start implementing Google login in your Flask application. Here is an example of how to do this using Authlib:

<pre>
from authlib.integrations.flask_client import OAuth
from flask import Flask, redirect, url_for
app = Flask(__name__)
oauth = OAuth(app)
google = oauth.register(
name='google',
client_id='your-google-client-id',
client_secret='your-google-client-secret',
authorize_url='https://accounts.google.com/o/oauth2/auth',
authorize_params=None,
access_token_url='https://accounts.google.com/o/oauth2/token',
access_token_params=None,
refresh_token_url=None,
client_kwargs={'scope': 'openid profile email'},
)
@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)
return user
</pre>

Conclusion

Implementing Google login in a Python Flask application with Authlib is a straightforward process that can provide a seamless and secure authentication experience for users. By following the steps outlined in this article, you can easily integrate Google login into your Flask application and take advantage of the powerful features offered by Authlib.