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authorS. Solomon Darnell2025-03-28 21:52:21 -0500
committerS. Solomon Darnell2025-03-28 21:52:21 -0500
commit4a52a71956a8d46fcb7294ac71734504bb09bcc2 (patch)
treeee3dc5af3b6313e921cd920906356f5d4febc4ed /.venv/lib/python3.12/site-packages/huggingface_hub/utils/_headers.py
parentcc961e04ba734dd72309fb548a2f97d67d578813 (diff)
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+# coding=utf-8
+# Copyright 2022-present, the HuggingFace Inc. team.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Contains utilities to handle headers to send in calls to Huggingface Hub."""
+
+from typing import Dict, Optional, Union
+
+from huggingface_hub.errors import LocalTokenNotFoundError
+
+from .. import constants
+from ._auth import get_token
+from ._deprecation import _deprecate_arguments
+from ._runtime import (
+ get_fastai_version,
+ get_fastcore_version,
+ get_hf_hub_version,
+ get_python_version,
+ get_tf_version,
+ get_torch_version,
+ is_fastai_available,
+ is_fastcore_available,
+ is_tf_available,
+ is_torch_available,
+)
+from ._validators import validate_hf_hub_args
+
+
+@_deprecate_arguments(
+ version="1.0",
+ deprecated_args="is_write_action",
+ custom_message="This argument is ignored and we let the server handle the permission error instead (if any).",
+)
+@validate_hf_hub_args
+def build_hf_headers(
+ *,
+ token: Optional[Union[bool, str]] = None,
+ library_name: Optional[str] = None,
+ library_version: Optional[str] = None,
+ user_agent: Union[Dict, str, None] = None,
+ headers: Optional[Dict[str, str]] = None,
+ is_write_action: bool = False,
+) -> Dict[str, str]:
+ """
+ Build headers dictionary to send in a HF Hub call.
+
+ By default, authorization token is always provided either from argument (explicit
+ use) or retrieved from the cache (implicit use). To explicitly avoid sending the
+ token to the Hub, set `token=False` or set the `HF_HUB_DISABLE_IMPLICIT_TOKEN`
+ environment variable.
+
+ In case of an API call that requires write access, an error is thrown if token is
+ `None` or token is an organization token (starting with `"api_org***"`).
+
+ In addition to the auth header, a user-agent is added to provide information about
+ the installed packages (versions of python, huggingface_hub, torch, tensorflow,
+ fastai and fastcore).
+
+ Args:
+ token (`str`, `bool`, *optional*):
+ The token to be sent in authorization header for the Hub call:
+ - if a string, it is used as the Hugging Face token
+ - if `True`, the token is read from the machine (cache or env variable)
+ - if `False`, authorization header is not set
+ - if `None`, the token is read from the machine only except if
+ `HF_HUB_DISABLE_IMPLICIT_TOKEN` env variable is set.
+ library_name (`str`, *optional*):
+ The name of the library that is making the HTTP request. Will be added to
+ the user-agent header.
+ library_version (`str`, *optional*):
+ The version of the library that is making the HTTP request. Will be added
+ to the user-agent header.
+ user_agent (`str`, `dict`, *optional*):
+ The user agent info in the form of a dictionary or a single string. It will
+ be completed with information about the installed packages.
+ headers (`dict`, *optional*):
+ Additional headers to include in the request. Those headers take precedence
+ over the ones generated by this function.
+ is_write_action (`bool`):
+ Ignored and deprecated argument.
+
+ Returns:
+ A `Dict` of headers to pass in your API call.
+
+ Example:
+ ```py
+ >>> build_hf_headers(token="hf_***") # explicit token
+ {"authorization": "Bearer hf_***", "user-agent": ""}
+
+ >>> build_hf_headers(token=True) # explicitly use cached token
+ {"authorization": "Bearer hf_***",...}
+
+ >>> build_hf_headers(token=False) # explicitly don't use cached token
+ {"user-agent": ...}
+
+ >>> build_hf_headers() # implicit use of the cached token
+ {"authorization": "Bearer hf_***",...}
+
+ # HF_HUB_DISABLE_IMPLICIT_TOKEN=True # to set as env variable
+ >>> build_hf_headers() # token is not sent
+ {"user-agent": ...}
+
+ >>> build_hf_headers(library_name="transformers", library_version="1.2.3")
+ {"authorization": ..., "user-agent": "transformers/1.2.3; hf_hub/0.10.2; python/3.10.4; tensorflow/1.55"}
+ ```
+
+ Raises:
+ [`ValueError`](https://docs.python.org/3/library/exceptions.html#ValueError)
+ If organization token is passed and "write" access is required.
+ [`ValueError`](https://docs.python.org/3/library/exceptions.html#ValueError)
+ If "write" access is required but token is not passed and not saved locally.
+ [`EnvironmentError`](https://docs.python.org/3/library/exceptions.html#EnvironmentError)
+ If `token=True` but token is not saved locally.
+ """
+ # Get auth token to send
+ token_to_send = get_token_to_send(token)
+
+ # Combine headers
+ hf_headers = {
+ "user-agent": _http_user_agent(
+ library_name=library_name,
+ library_version=library_version,
+ user_agent=user_agent,
+ )
+ }
+ if token_to_send is not None:
+ hf_headers["authorization"] = f"Bearer {token_to_send}"
+ if headers is not None:
+ hf_headers.update(headers)
+ return hf_headers
+
+
+def get_token_to_send(token: Optional[Union[bool, str]]) -> Optional[str]:
+ """Select the token to send from either `token` or the cache."""
+ # Case token is explicitly provided
+ if isinstance(token, str):
+ return token
+
+ # Case token is explicitly forbidden
+ if token is False:
+ return None
+
+ # Token is not provided: we get it from local cache
+ cached_token = get_token()
+
+ # Case token is explicitly required
+ if token is True:
+ if cached_token is None:
+ raise LocalTokenNotFoundError(
+ "Token is required (`token=True`), but no token found. You"
+ " need to provide a token or be logged in to Hugging Face with"
+ " `huggingface-cli login` or `huggingface_hub.login`. See"
+ " https://huggingface.co/settings/tokens."
+ )
+ return cached_token
+
+ # Case implicit use of the token is forbidden by env variable
+ if constants.HF_HUB_DISABLE_IMPLICIT_TOKEN:
+ return None
+
+ # Otherwise: we use the cached token as the user has not explicitly forbidden it
+ return cached_token
+
+
+def _http_user_agent(
+ *,
+ library_name: Optional[str] = None,
+ library_version: Optional[str] = None,
+ user_agent: Union[Dict, str, None] = None,
+) -> str:
+ """Format a user-agent string containing information about the installed packages.
+
+ Args:
+ library_name (`str`, *optional*):
+ The name of the library that is making the HTTP request.
+ library_version (`str`, *optional*):
+ The version of the library that is making the HTTP request.
+ user_agent (`str`, `dict`, *optional*):
+ The user agent info in the form of a dictionary or a single string.
+
+ Returns:
+ The formatted user-agent string.
+ """
+ if library_name is not None:
+ ua = f"{library_name}/{library_version}"
+ else:
+ ua = "unknown/None"
+ ua += f"; hf_hub/{get_hf_hub_version()}"
+ ua += f"; python/{get_python_version()}"
+
+ if not constants.HF_HUB_DISABLE_TELEMETRY:
+ if is_torch_available():
+ ua += f"; torch/{get_torch_version()}"
+ if is_tf_available():
+ ua += f"; tensorflow/{get_tf_version()}"
+ if is_fastai_available():
+ ua += f"; fastai/{get_fastai_version()}"
+ if is_fastcore_available():
+ ua += f"; fastcore/{get_fastcore_version()}"
+
+ if isinstance(user_agent, dict):
+ ua += "; " + "; ".join(f"{k}/{v}" for k, v in user_agent.items())
+ elif isinstance(user_agent, str):
+ ua += "; " + user_agent
+
+ # Retrieve user-agent origin headers from environment variable
+ origin = constants.HF_HUB_USER_AGENT_ORIGIN
+ if origin is not None:
+ ua += "; origin/" + origin
+
+ return _deduplicate_user_agent(ua)
+
+
+def _deduplicate_user_agent(user_agent: str) -> str:
+ """Deduplicate redundant information in the generated user-agent."""
+ # Split around ";" > Strip whitespaces > Store as dict keys (ensure unicity) > format back as string
+ # Order is implicitly preserved by dictionary structure (see https://stackoverflow.com/a/53657523).
+ return "; ".join({key.strip(): None for key in user_agent.split(";")}.keys())