🚚 Refactor and simplify backend file structure (#609)

src/backend/app/api/deps.py

@@ -0,0 +1,55 @@
+from typing import Annotated, Generator
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import jwt
+from pydantic import ValidationError
+from sqlmodel import Session
+
+from app.core import security
+from app.core.config import settings
+from app.db.engine import engine
+from app.models import TokenPayload, User
+
+reusable_oauth2 = OAuth2PasswordBearer(
+    tokenUrl=f"{settings.API_V1_STR}/login/access-token"
+)
+
+
+def get_db() -> Generator:
+    with Session(engine) as session:
+        yield session
+
+
+SessionDep = Annotated[Session, Depends(get_db)]
+TokenDep = Annotated[str, Depends(reusable_oauth2)]
+
+
+def get_current_user(session: SessionDep, token: TokenDep) -> User:
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=[security.ALGORITHM]
+        )
+        token_data = TokenPayload(**payload)
+    except (jwt.JWTError, ValidationError):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Could not validate credentials",
+        )
+    user = session.get(User, token_data.sub)
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    if not user.is_active:
+        raise HTTPException(status_code=400, detail="Inactive user")
+    return user
+
+
+CurrentUser = Annotated[User, Depends(get_current_user)]
+
+
+def get_current_active_superuser(current_user: CurrentUser) -> User:
+    if not current_user.is_superuser:
+        raise HTTPException(
+            status_code=400, detail="The user doesn't have enough privileges"
+        )
+    return current_user