Refactor: Move backend files to backend/ directory and split .gitignore

backend/src/ea_chatbot/api/dependencies.py

@@ -0,0 +1,46 @@
+import os
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from ea_chatbot.config import Settings
+from ea_chatbot.history.manager import HistoryManager
+from ea_chatbot.auth import OIDCClient
+from ea_chatbot.api.utils import decode_access_token
+from ea_chatbot.history.models import User
+
+settings = Settings()
+
+# Shared instances
+history_manager = HistoryManager(settings.history_db_url)
+
+oidc_client = None
+if settings.oidc_client_id and settings.oidc_client_secret and settings.oidc_server_metadata_url:
+    oidc_client = OIDCClient(
+        client_id=settings.oidc_client_id,
+        client_secret=settings.oidc_client_secret,
+        server_metadata_url=settings.oidc_server_metadata_url,
+        redirect_uri=os.getenv("OIDC_REDIRECT_URI", "http://localhost:3000/auth/callback")
+    )
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="auth/login")
+
+async def get_current_user(token: str = Depends(oauth2_scheme)) -> User:
+    """Dependency to get the current authenticated user from the JWT token."""
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    
+    payload = decode_access_token(token)
+    if payload is None:
+        raise credentials_exception
+        
+    user_id: str | None = payload.get("sub")
+    if user_id is None:
+        raise credentials_exception
+        
+    user = history_manager.get_user_by_id(user_id)
+    if user is None:
+        raise credentials_exception
+        
+    return user