safety API cleanup part 1

Sample adapter implementation for Bedrock implementation of Guardrails

llama_stack/providers/adapters/safety/bedrock/bedrock.py

@@ -0,0 +1,52 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+from typing import List
+
+from llama_stack.apis.safety import *  # noqa: F403
+from llama_stack.providers.utils import get_request_provider_data
+
+from .config import BedrockSafetyRequestProviderData
+
+
+class BedrockSafetyAdapter(Safety):
+    def __init__(self, url: str) -> None:
+        self.url = url
+        pass
+
+    async def initialize(self) -> None:
+        pass
+
+    async def shutdown(self) -> None:
+        pass
+
+    async def run_shield(
+        self,
+        shield: ShieldType,
+        messages: List[Message],
+    ) -> RunShieldResponse:
+        # clients will set api_keys by doing something like:
+        #
+        # client = llama_stack.LlamaStack()
+        # await client.safety.run_shield(
+        #   shield_type="aws_guardrail_type",
+        #   messages=[ ... ],
+        #   x_llamastack_provider_data={
+        #     "aws_api_key": "..."
+        #   }
+        # )
+        #
+        # This information will arrive at the LlamaStack server via a HTTP Header.
+        #
+        # The server will then provide you a type-checked version of this provider data
+        # automagically by extracting it from the header and validating it with the
+        # BedrockSafetyRequestProviderData class you will need to register in the provider
+        # registry.
+        #
+        provider_data: BedrockSafetyRequestProviderData = get_request_provider_data()
+        # use `aws_api_key` to pass to the AWS servers in whichever form
+
+        raise NotImplementedError()