Initial commit

backend/app/auth.py

@@ -0,0 +1,38 @@
+from typing import Dict, Any
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+
+from .db import get_user_by_username
+from .security import safe_decode_token, TokenError
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/auth/login")
+
+
+def get_current_user(token: str = Depends(oauth2_scheme)) -> Dict[str, Any]:
+    try:
+        payload = safe_decode_token(token)
+    except TokenError as exc:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token") from exc
+
+    username = payload.get("sub")
+    if not username:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token subject")
+
+    user = get_user_by_username(username)
+    if not user:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="User not found")
+    if user.get("is_blocked"):
+        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="User is blocked")
+
+    return {
+        "username": user["username"],
+        "role": user["role"],
+        "auth_provider": user.get("auth_provider", "local"),
+    }
+
+
+def require_admin(user: Dict[str, Any] = Depends(get_current_user)) -> Dict[str, Any]:
+    if user.get("role") != "admin":
+        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Admin access required")
+    return user