web server

app.py

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+from flask import Flask, redirect, url_for, session
+from flask_oauthlib.client import OAuth
+from flask_sqlalchemy import SQLAlchemy
+import os
+from dotenv import load_dotenv
+load_dotenv()
+
+app = Flask(__name__)
+
+app.config['SECRET_KEY'] = 'fjlksjfnklsdfnsdklfnsdkjfnsdjkfnds'
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///db.db'
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+db = SQLAlchemy(app)
+
+oauth = OAuth(app)
+
+google = oauth.remote_app(
+    'google',
+    consumer_key=os.getenv('GOOGLE_KEY'),
+    consumer_secret=os.getenv('GOOGLE_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',
+)
+
+class User(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    email = db.Column(db.String(120), unique=True)
+
+class Team(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(120), unique=True)
+    idUser = db.Column(db.Integer, db.ForeignKey('user.id'))
+
+@app.route('/')
+def index():
+    if 'google_token' in session:
+        me = google.get('userinfo')
+        user = User.query.filter_by(google_id=me.data['id']).first()
+        if user is None:
+            user = User(google_id=me.data['id'], email=me.data['email'])
+            db.session.add(user)
+            db.session.commit()
+        return 'Logged in as: ' + me.data['email']
+    return redirect("/login", code=302)
+
+@app.route('/login')
+def login():
+    return google.authorize(callback=url_for('authorized', _external=True))
+
+@app.route('/logout')
+def logout():
+    session.pop('google_token', None)
+    return 'Logged out'
+
+@app.route('/login/authorized')
+def authorized():
+    response = google.authorized_response()
+    if response is None or response.get('access_token') is None:
+        return 'Access denied: reason={} error={}'.format(
+            request.args['error_reason'],
+            request.args['error_description']
+        )
+    session['google_token'] = (response['access_token'], '')
+    me = google.get('userinfo')
+    return redirect("/", code=302)
+
+@google.tokengetter
+def get_google_oauth_token():
+    return session.get('google_token')
+
+if __name__ == '__main__':
+    with app.app_context():
+        db.create_all()
+    app.run(debug=True)

example.env

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+GOOGLE_KEY=""
+GOOGLE_SECRET=""

requirements.txt

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+Werkzeug==2.2.2
+Flask
+Flask-OAuthlib
+Flask-SQLAlchemy