Initial commit: AARS backend + frontend + holiday/leave phase 1+2

backend/auth.py

@@ -0,0 +1,72 @@
+from fastapi import Depends, HTTPException, status, Query
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from sqlalchemy.orm import Session
+from jose import JWTError, jwt
+from database import get_db, SECRET_KEY, ALGORITHM
+from models import User
+
+security = HTTPBearer()
+
+
+async def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(security),
+    db: Session = Depends(get_db)
+) -> User:
+    """Validate JWT token and return current user."""
+    token = credentials.credentials
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Invalid or expired token",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        user_id_str = payload.get("sub")
+        if user_id_str is None:
+            raise credentials_exception
+        try:
+            user_id = int(user_id_str)
+        except (ValueError, TypeError):
+            raise credentials_exception
+    except JWTError:
+        raise credentials_exception
+    
+    user = db.query(User).filter(User.id == user_id, User.is_active == True).first()
+    if user is None:
+        raise credentials_exception
+    return user
+
+
+async def get_current_admin(current_user: User = Depends(get_current_user)) -> User:
+    """Ensure current user is an admin."""
+    if current_user.role != "admin":
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Admin access required"
+        )
+    return current_user
+
+
+async def get_current_user_from_query(
+    token: str = Query(...),
+    db: Session = Depends(get_db)
+) -> User:
+    """Validate JWT token from query parameter and return current user."""
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Invalid or expired token",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        user_id_str = payload.get("sub")
+        if user_id_str is None:
+            raise credentials_exception
+        user_id = int(user_id_str)
+    except (JWTError, ValueError, TypeError):
+        raise credentials_exception
+    
+    user = db.query(User).filter(User.id == user_id, User.is_active == True).first()
+    if user is None:
+        raise credentials_exception
+    return user