app.py

from flask import Flask, redirect, url_for, render_template, flash
from flask_login import LoginManager, UserMixin, login_user, logout_user, current_user
from modules.oauth import OAuthSignIn
from flask_mongoengine import MongoEngine
from modules.mongo_helpers import get_mongo_db

mongodb = MongoEngine()

app = Flask(__name__)
# app.config['MONGODB_SETTINGS'] = {
#     'db': '<---YOUR_DB_NAME--->',
#     'host': 'mongodb://<---YOUR_DB_FULL URI--->'
# }
app.config['OAUTH_CREDENTIALS'] = config['OAUTH_CREDENTIALS']

db = MongoEngine(app)
app.config['SECRET_KEY'] = '<---YOUR_SECRET_FORM_KEY--->'
login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = 'login'


class User(UserMixin, db.Document):
    meta = {'collection': 'user'}
    email = db.StringField(max_length=30)
    password = db.StringField()


@login_manager.user_loader
def load_user(user_id):
    return User.objects(pk=user_id).first()


@app.route('/')
def index():
    return render_template('index.html')


@app.route('/logout')
def logout():
    logout_user()
    return redirect(url_for('index'))


@app.route('/authorize/<provider>')
def oauth_authorize(provider):
    if not current_user.is_anonymous:
        return redirect(url_for('index'))
    oauth = OAuthSignIn.get_provider(provider)
    return oauth.authorize()


@app.route('/callback/<provider>')
def oauth_callback(provider):
    if not current_user.is_anonymous:
        return redirect(url_for('index'))
    oauth = OAuthSignIn.get_provider(provider)
    social_id, username, email = oauth.callback()
    if social_id is None:
        flash('Authentication failed.')
        return redirect(url_for('index'))
    user = User.objects(email=form.email.data).first()
    if not user:
        user = User(social_id=social_id, nickname=username, email=email)
        db.session.add(user)
        db.session.commit()
    login_user(user, True)
    return redirect(url_for('index'))


if __name__ == '__main__':
    app.run(host='127.0.0.1', port=4000, debug=True)