app.py

import os
from flask import Flask, jsonify
from flask_smorest import Api
from flask_jwt_extended import JWTManager
from flask_migrate import Migrate
from db import db
from blocklist import BLOCKLIST
import models
from resources.item import blp as ItemBlueprint
from resources.store import blp as StoreBlueprint
from resources.tag import blp as TagBlueprint
from resources.user import blp as UserBlueprint


def create_app(db_url=None):
    app = Flask(__name__)

    # app.config['PROPAGATE_EXCEPTIONS'] = True
    app.config["API_TITLE"] = "Stores REST API"  # api needs this
    app.config["API_VERSION"] = "v1"  # api needs this
    app.config["OPENAPI_VERSION"] = "3.0.3"  # api needs this
    app.config["OPENAPI_URL_PREFIX"] = "/"  # swagger needs this
    app.config["OPENAPI_SWAGGER_UI_PATH"] = "/swagger-ui"  # swagger needs this
    app.config[
        "OPENAPI_SWAGGER_UI_URL"
    ] = "https://cdn.jsdelivr.net/npm/swagger-ui-dist/"  # swagger needs this
    app.config["SQLALCHEMY_DATABASE_URI"] = db_url or os.getenv(
        "DATABASE_URL", "sqlite:///data.db"
    )
    app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
    db.init_app(app)
    migrate = Migrate(app, db)
    api = Api(app)

    app.config["JWT_SECRET_KEY"] = "jose"
    jwt = JWTManager(app)

    @jwt.token_in_blocklist_loader
    def check_if_token_in_blocklist(jwt_header, jwt_payload):
        return jwt_payload["jti"] in BLOCKLIST

    @jwt.revoked_token_loader
    def revoked_token_callback(jwt_header, jwt_payload):
        return (
            jsonify(
                {"descrition": "The token has been revoked", "error": "token_revoked"}
            ),
            401,
        )

    @jwt.needs_fresh_token_loader
    def token_not_fresh_callback(jwt_header, jwt_payload):
        return (
            jsonify(
                {
                    "description": "The token is not fresh",
                    "error": "fresh_token_required.",
                }
            ),
            401,
        )

    @jwt.additional_claims_loader
    def add_claims_to_jwt(identity):
        if identity == 1:
            return {"is admin": True}
        return {"is admin": False}

    @jwt.expired_token_loader
    def expired_token_callback(jwt_header, jwt_payload):
        return (
            jsonify({"message": "The token has expired", "error": "token_expired"}),
            401,
        )

    @jwt.invalid_token_loader
    def invalid_token_callbak(error):
        return (
            jsonify(
                {"message": "Signature verification failed", "error": "invalid token"}
            ),
            401,
        )

    @jwt.unauthorized_loader
    def missing_token_callback(error):
        return jsonify(
            {
                "description": "Request does not contain an access token",
                "error": "authorizatiion_required",
            }
        )

    with app.app_context():
      db.create_all()
    api.register_blueprint(StoreBlueprint)
    api.register_blueprint(ItemBlueprint)
    api.register_blueprint(TagBlueprint)
    api.register_blueprint(UserBlueprint)
    return app