feat: backend core — models, auth, CRUD, tests

backend/app/auth/dependencies.py

@@ -0,0 +1,38 @@
+import uuid
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
+from jose import JWTError
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.auth.security import decode_token
+from app.database import get_session
+from app.models.user import User
+
+bearer_scheme = HTTPBearer()
+
+
+async def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(bearer_scheme),
+    session: AsyncSession = Depends(get_session),
+) -> User:
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        payload = decode_token(credentials.credentials)
+        user_id_str: str | None = payload.get("sub")
+        if user_id_str is None:
+            raise credentials_exception
+        user_id = uuid.UUID(user_id_str)
+    except (JWTError, ValueError):
+        raise credentials_exception
+
+    result = await session.execute(select(User).where(User.id == user_id))
+    user = result.scalar_one_or_none()
+    if user is None or not user.is_active:
+        raise credentials_exception
+    return user