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| 1 | +# Copyright 2025 Google LLC |
| 2 | +# |
| 3 | +# Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | +# you may not use this file except in compliance with the License. |
| 5 | +# You may obtain a copy of the License at |
| 6 | +# |
| 7 | +# http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | +# |
| 9 | +# Unless required by applicable law or agreed to in writing, software |
| 10 | +# distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | +# See the License for the specific language governing permissions and |
| 13 | +# limitations under the License. |
| 14 | + |
| 15 | +from __future__ import annotations |
| 16 | + |
| 17 | +from typing import Optional |
| 18 | + |
| 19 | +from typing_extensions import override |
| 20 | + |
| 21 | +from ...tools.tool_context import ToolContext |
| 22 | +from ...utils.feature_decorator import experimental |
| 23 | +from ..auth_credential import AuthCredential |
| 24 | +from ..auth_tool import AuthConfig |
| 25 | +from .base_credential_service import BaseCredentialService |
| 26 | + |
| 27 | + |
| 28 | +@experimental |
| 29 | +class InMemoryCredentialService(BaseCredentialService): |
| 30 | + """Class for in memory implementation of credential service(Experimental)""" |
| 31 | + |
| 32 | + def __init__(self): |
| 33 | + super().__init__() |
| 34 | + self._store: dict[str, AuthCredential] = {} |
| 35 | + |
| 36 | + @override |
| 37 | + async def load_credential( |
| 38 | + self, |
| 39 | + auth_config: AuthConfig, |
| 40 | + tool_context: ToolContext, |
| 41 | + ) -> Optional[AuthCredential]: |
| 42 | + """ |
| 43 | + Loads the credential by auth config and current tool context from the |
| 44 | + backend credential store. |
| 45 | +
|
| 46 | + Args: |
| 47 | + auth_config: The auth config which contains the auth scheme and auth |
| 48 | + credential information. auth_config.get_credential_key will be used to |
| 49 | + build the key to load the credential. |
| 50 | +
|
| 51 | + tool_context: The context of the current invocation when the tool is |
| 52 | + trying to load the credential. |
| 53 | +
|
| 54 | + Returns: |
| 55 | + Optional[AuthCredential]: the credential saved in the store. |
| 56 | +
|
| 57 | + """ |
| 58 | + storage = self._get_storage_for_current_context(tool_context) |
| 59 | + return storage.get(auth_config.credential_key) |
| 60 | + |
| 61 | + @override |
| 62 | + async def save_credential( |
| 63 | + self, |
| 64 | + auth_config: AuthConfig, |
| 65 | + tool_context: ToolContext, |
| 66 | + ) -> None: |
| 67 | + """ |
| 68 | + Saves the exchanged_auth_credential in auth config to the backend credential |
| 69 | + store. |
| 70 | +
|
| 71 | + Args: |
| 72 | + auth_config: The auth config which contains the auth scheme and auth |
| 73 | + credential information. auth_config.get_credential_key will be used to |
| 74 | + build the key to save the credential. |
| 75 | +
|
| 76 | + tool_context: The context of the current invocation when the tool is |
| 77 | + trying to save the credential. |
| 78 | +
|
| 79 | + Returns: |
| 80 | + None |
| 81 | + """ |
| 82 | + storage = self._get_storage_for_current_context(tool_context) |
| 83 | + storage[auth_config.credential_key] = auth_config.exchanged_auth_credential |
| 84 | + |
| 85 | + def _get_storage_for_current_context(self, tool_context: ToolContext) -> str: |
| 86 | + app_name = tool_context._invocation_context.app_name |
| 87 | + user_id = tool_context._invocation_context.user_id |
| 88 | + |
| 89 | + if app_name not in self._store: |
| 90 | + self._store[app_name] = {} |
| 91 | + if user_id not in self._store[app_name]: |
| 92 | + self._store[app_name][user_id] = {} |
| 93 | + return self._store[app_name][user_id] |
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