Refactoring code for modular approach

app/api/deps.py

@@ -0,0 +1,40 @@
+from fastapi import Depends, HTTPException
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from sqlalchemy.orm import Session
+from app.core.database import get_db
+from models.database_models import User, Shop
+from middleware.auth import AuthManager
+from middleware.rate_limiter import RateLimiter
+
+security = HTTPBearer()
+auth_manager = AuthManager()
+rate_limiter = RateLimiter()
+
+
+def get_current_user(
+        credentials: HTTPAuthorizationCredentials = Depends(security),
+        db: Session = Depends(get_db)
+):
+    """Get current authenticated user"""
+    return auth_manager.get_current_user(db, credentials)
+
+
+def get_current_admin_user(current_user: User = Depends(get_current_user)):
+    """Require admin user"""
+    return auth_manager.require_admin(current_user)
+
+
+def get_user_shop(
+        shop_code: str,
+        current_user: User = Depends(get_current_user),
+        db: Session = Depends(get_db)
+):
+    """Get shop and verify user ownership"""
+    shop = db.query(Shop).filter(Shop.shop_code == shop_code.upper()).first()
+    if not shop:
+        raise HTTPException(status_code=404, detail="Shop not found")
+
+    if current_user.role != "admin" and shop.owner_id != current_user.id:
+        raise HTTPException(status_code=403, detail="Access denied to this shop")
+
+    return shop