start

backend/app/services/auth.py

@@ -0,0 +1,13 @@
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.core.security import verify_password
+from app.models.user import User
+
+
+async def authenticate_user(db: AsyncSession, username: str, password: str) -> User | None:
+    result = await db.execute(select(User).where(User.username == username))
+    user = result.scalar_one_or_none()
+    if user is None or not verify_password(password, user.hashed_password):
+        return None
+    return user