How can I implement OAuth in my Flask application?

How can I implement OAuth in my Flask application?

You can use the Flask-OAuthlib library to easily integrate OAuth into your Flask app. Would you like a code example?

Yes, please provide a code example for Google OAuth.

Here's a basic example:

from flask import Flask, redirect, url_for
from flask_oauthlib.client import OAuth

app = Flask(__name__)
app.secret_key = 'random_secret_key'

oauth = OAuth(app)

google = oauth.remote_app(
    'google',
    consumer_key='YOUR_CLIENT_ID',
    consumer_secret='YOUR_CLIENT_SECRET',
    request_token_params={
        'scope': 'email',
    },
    base_url='https://www.googleapis.com/oauth2/v1/',
    request_token_url=None,
    access_token_method='POST',
    access_token_url='https://accounts.google.com/o/oauth2/token',
    authorize_url='https://accounts.google.com/o/oauth2/auth',
)

@app.route('/login')
def login():
    return google.authorize(callback=url_for('authorized', _external=True))

@app.route('/logout')
def logout():
    session.pop('google_token')
    return redirect(url_for('index'))

@app.route('/login/authorized')
def authorized():
    response = google.get('userinfo')
    return f'Logged in as: {response.data['email']}'

@google.tokengetter
def get_google_oauth_token():
    return session.get('google_token')

Make sure to replace YOUR_CLIENT_ID and YOUR_CLIENT_SECRET with your actual credentials.

What are the security considerations I should keep in mind?

You should ensure to use HTTPS, validate redirect URIs, and handle tokens securely to prevent leaks.