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Add sensitive_data_routing guardrail for on-premise routing
Detect sensitive data in a request via prebuilt, custom regex, and keyword matching, then reroute it to an on-premise model instead of blocking or redacting. The prompt passes through unchanged so the user workflow stays uninterrupted. With sticky sessions on, once sensitive data appears in a session every later turn in that session is also routed on-premise; the pin is keyed on the request session id and is shared across proxy workers via the cache when Redis is configured https://claude.ai/code/session_01R2hGPr2jc5kxnSYLRgqfMs
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5 changed files with 527 additions and 0 deletions
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"""Sensitive Data Routing guardrail: reroutes requests with sensitive data to an on-premise model."""
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from typing import TYPE_CHECKING, Any, List
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from litellm.types.guardrails import SupportedGuardrailIntegrations
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from .sensitive_data_routing import SensitiveDataRoutingGuardrail
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if TYPE_CHECKING:
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from litellm.types.guardrails import Guardrail, LitellmParams
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def _get_param(
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litellm_params: "LitellmParams",
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guardrail: "Guardrail",
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key: str,
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default: Any = None,
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) -> Any:
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value = getattr(litellm_params, key, None)
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if value is not None:
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return value
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raw = guardrail.get("litellm_params")
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if isinstance(raw, dict) and key in raw:
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return raw[key]
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return default
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def initialize_guardrail(
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litellm_params: "LitellmParams",
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guardrail: "Guardrail",
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) -> SensitiveDataRoutingGuardrail:
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import litellm
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guardrail_name = guardrail.get("guardrail_name")
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if not guardrail_name:
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raise ValueError("sensitive_data_routing guardrail requires a guardrail_name")
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on_premise_model = _get_param(litellm_params, guardrail, "on_premise_model")
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if not on_premise_model:
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raise ValueError(
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"sensitive_data_routing guardrail requires 'on_premise_model' (the model_list "
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"name to route sensitive requests to)"
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)
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instance = SensitiveDataRoutingGuardrail(
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guardrail_name=guardrail_name,
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on_premise_model=on_premise_model,
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prebuilt_patterns=_get_param(litellm_params, guardrail, "prebuilt_patterns"),
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regex_patterns=_get_param(litellm_params, guardrail, "regex_patterns"),
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keywords=_get_param(litellm_params, guardrail, "keywords"),
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sticky_session=bool(
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_get_param(litellm_params, guardrail, "sticky_session", True)
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),
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session_ttl_seconds=int(
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_get_param(litellm_params, guardrail, "session_ttl_seconds", 14400)
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),
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event_hook=_get_param(litellm_params, guardrail, "mode"),
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default_on=bool(_get_param(litellm_params, guardrail, "default_on", False)),
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)
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litellm.logging_callback_manager.add_litellm_callback(instance)
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return instance
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guardrail_initializer_registry = {
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SupportedGuardrailIntegrations.SENSITIVE_DATA_ROUTING.value: initialize_guardrail,
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}
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guardrail_class_registry = {
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SupportedGuardrailIntegrations.SENSITIVE_DATA_ROUTING.value: SensitiveDataRoutingGuardrail,
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}
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__all__: List[str] = [
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"SensitiveDataRoutingGuardrail",
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"initialize_guardrail",
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]
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@ -0,0 +1,200 @@
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"""
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Sensitive Data Routing guardrail.
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Detects sensitive data in a request and, instead of blocking or redacting it,
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reroutes the request to an on-premise model. When sticky sessions are enabled,
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every later turn in the same session is also routed on-premise so a conversation
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that once touched sensitive data never leaves the on-premise model.
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"""
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import re
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from typing import (
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TYPE_CHECKING,
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Any,
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Iterator,
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List,
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Optional,
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Pattern,
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Type,
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Union,
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)
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from litellm._logging import verbose_proxy_logger
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from litellm.integrations.custom_guardrail import CustomGuardrail
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from litellm.types.guardrails import GuardrailEventHooks
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from litellm.types.utils import CallTypes
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if TYPE_CHECKING:
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from litellm.caching import DualCache
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from litellm.proxy._types import UserAPIKeyAuth
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from litellm.types.proxy.guardrails.guardrail_hooks.base import GuardrailConfigModel
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CACHE_KEY_PREFIX = "sensitive_data_routing"
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class SensitiveDataRoutingGuardrail(CustomGuardrail):
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def __init__(
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self,
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on_premise_model: str,
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guardrail_name: Optional[str] = None,
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prebuilt_patterns: Optional[List[str]] = None,
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regex_patterns: Optional[List[str]] = None,
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keywords: Optional[List[str]] = None,
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sticky_session: bool = True,
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session_ttl_seconds: int = 14400,
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event_hook: Optional[Union[str, GuardrailEventHooks]] = None,
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default_on: bool = False,
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**kwargs: Any,
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) -> None:
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super().__init__(
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guardrail_name=guardrail_name or "sensitive_data_routing",
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supported_event_hooks=[GuardrailEventHooks.pre_call],
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event_hook=event_hook or GuardrailEventHooks.pre_call,
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default_on=default_on,
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**kwargs,
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)
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self.on_premise_model = on_premise_model
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self.sticky_session = sticky_session
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self.session_ttl_seconds = session_ttl_seconds
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self._patterns = self._compile_patterns(prebuilt_patterns, regex_patterns)
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self._keywords = [k.lower() for k in (keywords or [])]
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if not self._patterns and not self._keywords:
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raise ValueError(
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"sensitive_data_routing requires at least one of prebuilt_patterns, "
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"regex_patterns, or keywords"
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)
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@staticmethod
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def _compile_patterns(
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prebuilt_patterns: Optional[List[str]],
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regex_patterns: Optional[List[str]],
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) -> List[Pattern]:
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from litellm.proxy.guardrails.guardrail_hooks.litellm_content_filter.patterns import (
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get_compiled_pattern,
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)
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compiled: List[Pattern] = [
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get_compiled_pattern(name) for name in (prebuilt_patterns or [])
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]
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compiled.extend(
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re.compile(pattern, re.IGNORECASE) for pattern in (regex_patterns or [])
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)
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return compiled
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@staticmethod
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def get_config_model() -> Optional[Type["GuardrailConfigModel"]]:
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from litellm.types.proxy.guardrails.guardrail_hooks.sensitive_data_routing import (
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SensitiveDataRoutingConfigModel,
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)
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return SensitiveDataRoutingConfigModel
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async def async_pre_call_hook(
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self,
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user_api_key_dict: "UserAPIKeyAuth",
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cache: "DualCache",
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data: dict,
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call_type: str,
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) -> Optional[dict]:
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session_id = self._get_session_id(data)
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session_pinned = (
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self.sticky_session
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and session_id is not None
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and await self._is_session_pinned(cache, session_id)
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)
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detected = (not session_pinned) and self._contains_sensitive_data(
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data, call_type
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)
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if not session_pinned and not detected:
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return None
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if detected and self.sticky_session and session_id is not None:
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await self._pin_session(cache, session_id)
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original_model = data.get("model")
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data["model"] = self.on_premise_model
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self._log_route(
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data=data,
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original_model=original_model,
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detected=detected,
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session_id=session_id,
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)
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return data
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def _contains_sensitive_data(self, data: dict, call_type: str) -> bool:
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messages = self.get_guardrails_messages_for_call_type(
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call_type=CallTypes(call_type), data=data
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)
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for text in self._iter_message_texts(messages):
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if any(pattern.search(text) for pattern in self._patterns):
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return True
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lowered = text.lower()
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if any(keyword in lowered for keyword in self._keywords):
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return True
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return False
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@staticmethod
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def _iter_message_texts(messages: Optional[List[Any]]) -> Iterator[str]:
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for message in messages or []:
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if not isinstance(message, dict):
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continue
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content = message.get("content")
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if isinstance(content, str):
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yield content
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elif isinstance(content, list):
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for part in content:
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if isinstance(part, dict) and isinstance(part.get("text"), str):
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yield part["text"]
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@staticmethod
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def _get_session_id(data: dict) -> Optional[str]:
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session_id = data.get("litellm_session_id")
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if session_id:
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return str(session_id)
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for meta_key in ("metadata", "litellm_metadata"):
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meta = data.get(meta_key)
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if isinstance(meta, dict) and meta.get("session_id"):
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return str(meta["session_id"])
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return None
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def _session_cache_key(self, session_id: str) -> str:
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return f"{CACHE_KEY_PREFIX}:{self.guardrail_name}:{session_id}"
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async def _is_session_pinned(self, cache: "DualCache", session_id: str) -> bool:
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return bool(
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await cache.async_get_cache(key=self._session_cache_key(session_id))
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)
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async def _pin_session(self, cache: "DualCache", session_id: str) -> None:
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await cache.async_set_cache(
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key=self._session_cache_key(session_id),
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value=True,
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ttl=self.session_ttl_seconds,
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)
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def _log_route(
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self,
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data: dict,
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original_model: Optional[str],
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detected: bool,
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session_id: Optional[str],
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) -> None:
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verbose_proxy_logger.info(
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"sensitive_data_routing: rerouting model=%s -> %s (detected=%s, session=%s)",
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original_model,
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self.on_premise_model,
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detected,
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session_id,
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)
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self.add_standard_logging_guardrail_information_to_request_data(
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guardrail_json_response={
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"action": "route",
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"on_premise_model": self.on_premise_model,
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"trigger": "detection" if detected else "sticky_session",
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},
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request_data=data,
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guardrail_status="guardrail_intervened",
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event_type=GuardrailEventHooks.pre_call,
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)
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@ -26,6 +26,9 @@ from litellm.types.proxy.guardrails.guardrail_hooks.litellm_content_filter impor
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from litellm.types.proxy.guardrails.guardrail_hooks.promptguard import (
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PromptGuardConfigModel,
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)
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from litellm.types.proxy.guardrails.guardrail_hooks.sensitive_data_routing import (
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SensitiveDataRoutingConfigModel,
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)
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from litellm.types.proxy.guardrails.guardrail_hooks.xecguard import (
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XecGuardConfigModel,
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)
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@ -107,6 +110,7 @@ class SupportedGuardrailIntegrations(Enum):
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QOSTODIAN_NEXUS = "qostodian_nexus"
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RUBRIK = "rubrik"
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VIGIL_GUARD = "vigil_guard"
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SENSITIVE_DATA_ROUTING = "sensitive_data_routing"
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class Role(Enum):
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@ -805,6 +809,7 @@ class LitellmParams(
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HiddenlayerGuardrailConfigModel,
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QostodianNexusConfigModel,
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VigilGuardGuardrailConfigModel,
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SensitiveDataRoutingConfigModel,
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):
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guardrail: str = Field(description="The type of guardrail integration to use")
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mode: Union[str, List[str], Mode] = Field(
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"""Types for the Sensitive Data Routing guardrail."""
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from typing import List, Optional
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from pydantic import Field
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from .base import GuardrailConfigModel
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class SensitiveDataRoutingConfigModel(GuardrailConfigModel):
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"""Configuration for the Sensitive Data Routing guardrail."""
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on_premise_model: Optional[str] = Field(
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default=None,
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description="Name of the model group to route to when sensitive data is detected. Must be present in your model_list.",
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)
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prebuilt_patterns: Optional[List[str]] = Field(
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default=None,
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description="Names of built-in detection patterns to match against, e.g. 'us_ssn', 'credit_card', 'email'. See the litellm content filter prebuilt patterns for the full list.",
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)
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regex_patterns: Optional[List[str]] = Field(
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default=None,
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description="Custom regular expressions; a match in any request message reroutes the request on-premise.",
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)
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keywords: Optional[List[str]] = Field(
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default=None,
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description="Case-insensitive keywords; presence in any request message reroutes the request on-premise.",
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)
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sticky_session: bool = Field(
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default=True,
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description="When True, once sensitive data is detected in a session every later turn in that session is also routed on-premise, even turns that contain no sensitive data. Requires the client to send a stable session id.",
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)
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session_ttl_seconds: int = Field(
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default=14400,
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description="How long, in seconds, a session stays pinned on-premise after sensitive data is detected.",
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)
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@staticmethod
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def ui_friendly_name() -> str:
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return "Sensitive Data Routing"
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"""Tests for the Sensitive Data Routing guardrail."""
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from typing import Any, Dict, List, Optional, Tuple
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import pytest
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from litellm.caching import DualCache
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from litellm.proxy._types import UserAPIKeyAuth
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from litellm.proxy.guardrails.guardrail_hooks.sensitive_data_routing import (
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SensitiveDataRoutingGuardrail,
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initialize_guardrail,
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)
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from litellm.types.guardrails import GuardrailEventHooks, LitellmParams
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ON_PREM = "on-prem-model"
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USER_KEY = UserAPIKeyAuth()
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class RecordingCache(DualCache):
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"""DualCache that records writes so tests can assert pinning behavior."""
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def __init__(self) -> None:
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super().__init__()
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self.sets: List[Tuple[str, Any, Optional[int]]] = []
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async def async_set_cache(self, key, value, local_only: bool = False, **kwargs):
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self.sets.append((key, value, kwargs.get("ttl")))
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await super().async_set_cache(key, value, local_only=local_only, **kwargs)
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def _request(text, model="gpt-4o", **extra) -> Dict[str, Any]:
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return {"model": model, "messages": [{"role": "user", "content": text}], **extra}
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def _make_guardrail(**overrides) -> SensitiveDataRoutingGuardrail:
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params: Dict[str, Any] = dict(
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guardrail_name="sdr",
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on_premise_model=ON_PREM,
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prebuilt_patterns=["us_ssn"],
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keywords=["confidential"],
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)
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params.update(overrides)
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return SensitiveDataRoutingGuardrail(**params)
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async def _hook(guardrail, data, cache=None):
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return await guardrail.async_pre_call_hook(
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user_api_key_dict=USER_KEY,
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cache=cache or DualCache(),
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data=data,
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call_type="acompletion",
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)
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@pytest.mark.asyncio
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async def test_clean_prompt_is_not_rerouted():
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g = _make_guardrail()
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data = _request("what's the weather today?")
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result = await _hook(g, data)
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assert result is None
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assert data["model"] == "gpt-4o"
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@pytest.mark.asyncio
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async def test_prebuilt_pattern_match_reroutes_to_on_prem():
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g = _make_guardrail()
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data = _request("my social security number is 123-45-6789")
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result = await _hook(g, data)
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assert result is not None
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assert result["model"] == ON_PREM
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assert data["model"] == ON_PREM
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@pytest.mark.asyncio
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async def test_custom_regex_match_reroutes():
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g = _make_guardrail(prebuilt_patterns=None, regex_patterns=[r"project\s+titan"])
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data = _request("notes on Project Titan rollout")
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result = await _hook(g, data)
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assert result is not None and result["model"] == ON_PREM
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@pytest.mark.asyncio
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async def test_keyword_match_is_case_insensitive():
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g = _make_guardrail(prebuilt_patterns=None, keywords=["confidential"])
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data = _request("this memo is CONFIDENTIAL")
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result = await _hook(g, data)
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assert result is not None and result["model"] == ON_PREM
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@pytest.mark.asyncio
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async def test_detects_text_in_content_parts_list():
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g = _make_guardrail()
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data = {
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"model": "gpt-4o",
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"messages": [
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{
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"role": "user",
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"content": [{"type": "text", "text": "ssn 123-45-6789"}],
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}
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],
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}
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result = await _hook(g, data)
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assert result is not None and result["model"] == ON_PREM
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@pytest.mark.asyncio
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async def test_reroute_records_guardrail_logging_information():
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g = _make_guardrail()
|
||||
data = _request("ssn 123-45-6789")
|
||||
await _hook(g, data)
|
||||
entries = data["metadata"]["standard_logging_guardrail_information"]
|
||||
assert len(entries) == 1
|
||||
assert entries[0]["guardrail_name"] == "sdr"
|
||||
|
||||
|
||||
@pytest.mark.asyncio
|
||||
async def test_sticky_session_pins_following_clean_turns():
|
||||
g = _make_guardrail(sticky_session=True, session_ttl_seconds=999)
|
||||
cache = RecordingCache()
|
||||
session = {"litellm_session_id": "sess-1"}
|
||||
|
||||
first = await _hook(g, _request("ssn 123-45-6789", **session), cache)
|
||||
assert first is not None and first["model"] == ON_PREM
|
||||
assert cache.sets and cache.sets[0][0].endswith("sess-1")
|
||||
assert cache.sets[0][2] == 999 # ttl is honored
|
||||
|
||||
follow_up = _request("just a normal follow-up question", **session)
|
||||
result = await _hook(g, follow_up, cache)
|
||||
assert result is not None
|
||||
assert follow_up["model"] == ON_PREM
|
||||
|
||||
|
||||
@pytest.mark.asyncio
|
||||
async def test_non_sticky_does_not_pin_session():
|
||||
g = _make_guardrail(sticky_session=False)
|
||||
cache = RecordingCache()
|
||||
session = {"litellm_session_id": "sess-2"}
|
||||
|
||||
await _hook(g, _request("ssn 123-45-6789", **session), cache)
|
||||
assert cache.sets == [] # nothing pinned
|
||||
|
||||
follow_up = _request("a normal follow-up", **session)
|
||||
result = await _hook(g, follow_up, cache)
|
||||
assert result is None
|
||||
assert follow_up["model"] == "gpt-4o"
|
||||
|
||||
|
||||
@pytest.mark.asyncio
|
||||
async def test_sessions_are_isolated_from_each_other():
|
||||
g = _make_guardrail(sticky_session=True)
|
||||
cache = RecordingCache()
|
||||
|
||||
await _hook(g, _request("ssn 123-45-6789", litellm_session_id="flagged"), cache)
|
||||
|
||||
other = _request("nothing sensitive here", litellm_session_id="other")
|
||||
result = await _hook(g, other, cache)
|
||||
assert result is None
|
||||
assert other["model"] == "gpt-4o"
|
||||
|
||||
|
||||
@pytest.mark.asyncio
|
||||
async def test_session_id_read_from_metadata():
|
||||
g = _make_guardrail(sticky_session=True)
|
||||
cache = RecordingCache()
|
||||
meta = {"metadata": {"session_id": "meta-sess"}}
|
||||
|
||||
await _hook(g, _request("ssn 123-45-6789", **meta), cache)
|
||||
follow_up = _request("benign follow-up", **meta)
|
||||
result = await _hook(g, follow_up, cache)
|
||||
assert result is not None and follow_up["model"] == ON_PREM
|
||||
|
||||
|
||||
def test_requires_at_least_one_detector():
|
||||
with pytest.raises(ValueError):
|
||||
SensitiveDataRoutingGuardrail(guardrail_name="sdr", on_premise_model=ON_PREM)
|
||||
|
||||
|
||||
def test_only_supports_pre_call_event_hook():
|
||||
with pytest.raises(ValueError):
|
||||
_make_guardrail(event_hook=GuardrailEventHooks.post_call)
|
||||
|
||||
|
||||
def test_initializer_requires_on_premise_model():
|
||||
params = LitellmParams(guardrail="sensitive_data_routing", mode="pre_call")
|
||||
with pytest.raises(ValueError):
|
||||
initialize_guardrail(
|
||||
litellm_params=params,
|
||||
guardrail={"guardrail_name": "sdr", "litellm_params": {}},
|
||||
)
|
||||
|
||||
|
||||
def test_initializer_builds_guardrail_from_config():
|
||||
params = LitellmParams(
|
||||
guardrail="sensitive_data_routing",
|
||||
mode="pre_call",
|
||||
on_premise_model=ON_PREM,
|
||||
prebuilt_patterns=["us_ssn"],
|
||||
keywords=["confidential"],
|
||||
session_ttl_seconds=120,
|
||||
)
|
||||
instance = initialize_guardrail(
|
||||
litellm_params=params,
|
||||
guardrail={"guardrail_name": "sdr", "litellm_params": {}},
|
||||
)
|
||||
assert isinstance(instance, SensitiveDataRoutingGuardrail)
|
||||
assert instance.on_premise_model == ON_PREM
|
||||
assert instance.session_ttl_seconds == 120
|
||||
Loading…
Add table
Reference in a new issue