initial commit 2

backend/app/dependencies.py

@@ -0,0 +1,31 @@
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from sqlalchemy.orm import Session
+
+from .core.config import settings
+from .crud import get_user_by_id
+from .db.session import get_db
+from .models import User
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl='/auth/login')
+
+
+def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)) -> User:
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail='Token inválido o expirado',
+        headers={'WWW-Authenticate': 'Bearer'},
+    )
+    try:
+        payload = jwt.decode(token, settings.secret_key, algorithms=[settings.algorithm])
+        user_id = payload.get('sub')
+        if user_id is None:
+            raise credentials_exception
+    except JWTError as exc:
+        raise credentials_exception from exc
+
+    user = get_user_by_id(db, int(user_id))
+    if user is None:
+        raise credentials_exception
+    return user