add cors

backend/.env.example

@@ -1,2 +1,3 @@
 FLASK_APP=main.py
 FLASK_ENV=development
+ENABLE_CORS=True

backend/app/__init__.py

@@ -2,6 +2,7 @@ import os
 
 from flask import Flask
 from flask_migrate import Migrate
+from flask_cors import CORS
 
 from .config import config
 from .dependencies import db, ma
@@ -16,6 +17,9 @@ def create_app(config_name: str = None) -> Flask:
     app = Flask(__name__)
     app.config.from_object(config.get(config_name) or config.get("development"))
 
+    if app.config['ENABLE_CORS']:
+        CORS(app)
+
     db.init_app(app)
     ma.init_app(app)
 

backend/app/config.py

@@ -1,3 +1,4 @@
+import os
 from pathlib import Path
 
 
@@ -7,6 +8,7 @@ class Config:
     BASE_DIR = Path(__file__).resolve().parent.parent
     SRC_DIR = BASE_DIR / "app"
     EXCLUDED_DIRS = ["__pycache__", "commands"]
+    ENABLE_CORS = os.environ.get('ENABLE_CORS') or False
 
     SQLALCHEMY_TRACK_MODIFICATIONS = False
     SQLALCHEMY_DATABASE_URI = f'sqlite:///{BASE_DIR / "db.sqlite"}'

backend/requirements.txt

@@ -2,6 +2,7 @@ alembic==1.7.7
 attrs==21.4.0
 click==8.1.3
 Flask==2.1.2
+Flask-Cors==3.0.10
 flask-marshmallow==0.14.0
 Flask-Migrate==3.1.0
 Flask-SQLAlchemy==2.5.1