Initial commit

backend/app/dependencies.py

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+"""Shared dependencies for FastAPI dependency injection."""
+
+from typing import Generator, Optional
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from sqlalchemy.orm import Session
+from jose import JWTError, jwt
+
+from app.db.session import SessionLocal
+from app.config import settings
+from app.core.security import decode_access_token
+from app import models, crud
+
+
+# Database dependency
+def get_db() -> Generator[Session, None, None]:
+    """
+    Dependency that provides a database session.
+    Automatically closes the session after the request.
+    """
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+# Security
+security = HTTPBearer()
+
+
+def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(security),
+    db: Session = Depends(get_db)
+) -> models.User:
+    """
+    Dependency that validates JWT token and returns current user.
+    Raises HTTPException if token is invalid or user not found.
+    """
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+
+    try:
+        payload = decode_access_token(credentials.credentials)
+        user_id: str = payload.get("sub")
+        if user_id is None:
+            raise credentials_exception
+    except JWTError:
+        raise credentials_exception
+
+    user = crud.user.get(db, id=user_id)
+    if user is None:
+        raise credentials_exception
+
+    if not user.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Inactive user"
+        )
+
+    return user
+
+
+def get_current_active_superuser(
+    current_user: models.User = Depends(get_current_user)
+) -> models.User:
+    """
+    Dependency that requires the current user to be a superuser.
+    """
+    if not current_user.is_superuser:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions"
+        )
+    return current_user
+
+
+# Alias for backward compatibility
+get_current_superuser = get_current_active_superuser