feat: Introduce OAuth2 authentication to history routes, replacing the default user with authenticated user management.

lightrag/api/routers/history_routes.py

@@ -1,9 +1,11 @@
-from fastapi import APIRouter, Depends, HTTPException
+from fastapi import APIRouter, Depends, HTTPException, Security, status
+from fastapi.security import OAuth2PasswordBearer
 from sqlalchemy.orm import Session
 from typing import List, Optional
 from uuid import UUID
 import sys
 import os
+from lightrag.api.auth import auth_handler
 
 # Ensure service module is in path (similar to query_routes.py)
 project_root = os.path.abspath(os.path.join(os.path.dirname(__file__), "../../../"))
@@ -27,43 +29,75 @@ except ImportError:
 
 router = APIRouter()
 
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="login", auto_error=False)
+
 def check_dependencies():
     if not HistoryManager:
         raise HTTPException(status_code=503, detail="History service not available")
 
+async def get_current_user(
+    token: str = Security(oauth2_scheme),
+    db: Session = Depends(get_db)
+) -> User:
+    check_dependencies()
+    
+    if not token:
+        # If no token provided, try to use default user if configured or allowed
+        # For now, we'll return the default user for backward compatibility if needed,
+        # but ideally we should require auth.
+        # Let's check if we have a default user
+        user = db.query(User).filter(User.username == "default_user").first()
+        if not user:
+             user = User(username="default_user", email="default@example.com")
+             db.add(user)
+             db.commit()
+             db.refresh(user)
+        return user
+
+    try:
+        user_data = auth_handler.validate_token(token)
+        username = user_data["username"]
+        
+        user = db.query(User).filter(User.username == username).first()
+        if not user:
+            # Create user if not exists (auto-registration on first login)
+            # In a real app you might want to fetch email from token metadata or require explicit registration
+            user = User(username=username, email=f"{username}@example.com") 
+            db.add(user)
+            db.commit()
+            db.refresh(user)
+            
+        return user
+    except HTTPException:
+        raise
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Could not validate credentials",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+
 @router.get("/sessions", response_model=List[SessionResponse], tags=["History"])
 def list_sessions(
     skip: int = 0, 
     limit: int = 20, 
-    db: Session = Depends(get_db)
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user)
 ):
     check_dependencies()
     manager = HistoryManager(db)
-    # For now, get default user or create one
-    user = db.query(User).filter(User.username == "default_user").first()
-    if not user:
-        user = User(username="default_user", email="default@example.com")
-        db.add(user)
-        db.commit()
-        db.refresh(user)
-        
-    sessions = manager.list_sessions(user_id=user.id, skip=skip, limit=limit)
+    sessions = manager.list_sessions(user_id=current_user.id, skip=skip, limit=limit)
     return sessions
 
 @router.post("/sessions", response_model=SessionResponse, tags=["History"])
 def create_session(
     session_in: SessionCreate, 
-    db: Session = Depends(get_db)
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user)
 ):
     check_dependencies()
     manager = HistoryManager(db)
-    user = db.query(User).filter(User.username == "default_user").first()
-    if not user:
-        user = User(username="default_user", email="default@example.com")
-        db.add(user)
-        db.commit()
-    
-    return manager.create_session(user_id=user.id, title=session_in.title)
+    return manager.create_session(user_id=current_user.id, title=session_in.title)
 
 @router.get("/sessions/{session_id}/history", response_model=List[ChatMessageResponse], tags=["History"])
 def get_session_history(