Implement async db access in admin

packages/sshecret-admin/src/sshecret_admin/auth/authentication.py

@@ -8,6 +8,7 @@ import bcrypt
 import jwt
 
 from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import Session
 from sshecret_admin.core.settings import AdminServerSettings
 
@@ -72,6 +73,16 @@ def check_password(plain_password: str, hashed_password: str) -> None:
         raise AuthenticationFailedError()
 
 
+async def authenticate_user_async(session: AsyncSession, username: str, password: str) -> User | None:
+    """Authenticate user async."""
+    user = (await session.scalars(select(User).where(User.username == username))).first()
+    if not user:
+        return None
+    if not verify_password(password, user.hashed_password):
+        return None
+    return user
+
+
 def authenticate_user(session: Session, username: str, password: str) -> User | None:
     """Authenticate user."""
     user = session.scalars(select(User).where(User.username == username)).first()