server.py

import base64
import os

from cryptography.fernet import Fernet
from flask import Flask
from flask_mail import Mail
from flaskext.mysql import MySQL
import secrets

mysql = MySQL()
mail = Mail()
fernet = Fernet(base64.b64encode(os.environ['FERNET_KEY'].encode('utf-8')).rjust(44, b'v'))


def create_server():
    app = Flask(__name__)

    # update app config from file config.py
    app.config.from_object('config.DevelopmentConfig')

    # IN A PRODUCTION ENVIRONMENT
    # app.config.from_object(config)
    app.jinja_env.cache = {}

    with app.app_context():
        # initialize extensions
        mysql.init_app(app)
        mail = Mail(app)

        # secret_key generation
        app.secret_key = secrets.token_urlsafe(256)

        # if you reformat this code, the imports go up resulting in
        # circular importing which breaks the blueprint architecture

        from routes.common import routes as common_routes
        from routes.user import routes as user_routes
        from routes.admin import routes as admin_routes
        from routes.api import routes as api_routes
        from routes.errors.routes import page_not_found, logic_error

        app.register_blueprint(common_routes.common_bp)
        app.register_blueprint(user_routes.user_bp, url_prefix="/nileuser")
        app.register_blueprint(admin_routes.admin_bp, url_prefix="/admin")
        app.register_blueprint(api_routes.api_bp, url_prefix="/api")

        app.register_error_handler(404, page_not_found)
        app.register_error_handler(500, logic_error)

    return app