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# Copyright 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"). You # may not use this file except in compliance with the License. A copy of # the License is located at # # http://aws.amazon.com/apache2.0/ # # or in the "license" file accompanying this file. This file 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. """ NOTE: All classes and functions in this module are considered private and are subject to abrupt breaking changes. Please do not use them directly. To modify the User-Agent header sent by botocore, use one of these configuration options: * The ``AWS_SDK_UA_APP_ID`` environment variable. * The ``sdk_ua_app_id`` setting in the shared AWS config file. * The ``user_agent_appid`` field in the :py:class:`botocore.config.Config`. * The ``user_agent_extra`` field in the :py:class:`botocore.config.Config`. """ import os import platform from copy import copy from string import ascii_letters, digits from typing import NamedTuple, Optional from botocore import __version__ as botocore_version from botocore.compat import HAS_CRT _USERAGENT_ALLOWED_CHARACTERS = ascii_letters + digits + "!$%&'*+-.^_`|~" _USERAGENT_ALLOWED_OS_NAMES = ( 'windows', 'linux', 'macos', 'android', 'ios', 'watchos', 'tvos', 'other', ) _USERAGENT_PLATFORM_NAME_MAPPINGS = {'darwin': 'macos'} # The name by which botocore is identified in the User-Agent header. While most # AWS SDKs follow a naming pattern of "aws-sdk-*", botocore and boto3 continue # using their existing values. Uses uppercase "B" with all other characters # lowercase. _USERAGENT_SDK_NAME = 'Botocore' def sanitize_user_agent_string_component(raw_str, allow_hash): """Replaces all not allowed characters in the string with a dash ("-"). Allowed characters are ASCII alphanumerics and ``!$%&'*+-.^_`|~``. If ``allow_hash`` is ``True``, "#"``" is also allowed. :type raw_str: str :param raw_str: The input string to be sanitized. :type allow_hash: bool :param allow_hash: Whether "#" is considered an allowed character. """ return ''.join( c if c in _USERAGENT_ALLOWED_CHARACTERS or (allow_hash and c == '#') else '-' for c in raw_str ) class UserAgentComponent(NamedTuple): """ Component of a Botocore User-Agent header string in the standard format. Each component consists of a prefix, a name, and a value. In the string representation these are combined in the format ``prefix/name#value``. This class is considered private and is subject to abrupt breaking changes. """ prefix: str name: str value: Optional[str] = None def to_string(self): """Create string like 'prefix/name#value' from a UserAgentComponent.""" clean_prefix = sanitize_user_agent_string_component( self.prefix, allow_hash=True ) clean_name = sanitize_user_agent_string_component( self.name, allow_hash=False ) if self.value is None or self.value == '': return f'{clean_prefix}/{clean_name}' clean_value = sanitize_user_agent_string_component( self.value, allow_hash=True ) return f'{clean_prefix}/{clean_name}#{clean_value}' class RawStringUserAgentComponent: """ UserAgentComponent interface wrapper around ``str``. Use for User-Agent header components that are not constructed from prefix+name+value but instead are provided as strings. No sanitization is performed. """ def __init__(self, value): self._value = value def to_string(self): return self._value # This is not a public interface and is subject to abrupt breaking changes. # Any usage is not advised or supported in external code bases. try: from botocore.customizations.useragent import modify_components except ImportError: # Default implementation that returns unmodified User-Agent components. def modify_components(components): return components class UserAgentString: """ Generator for AWS SDK User-Agent header strings. The User-Agent header format contains information from session, client, and request context. ``UserAgentString`` provides methods for collecting the information and ``to_string`` for assembling it into the standardized string format. Example usage: ua_session = UserAgentString.from_environment() ua_session.set_session_config(...) ua_client = ua_session.with_client_config(Config(...)) ua_string = ua_request.to_string() For testing or when information from all sources is available at the same time, the methods can be chained: ua_string = ( UserAgentString .from_environment() .set_session_config(...) .with_client_config(Config(...)) .to_string() ) """ def __init__( self, platform_name, platform_version, platform_machine, python_version, python_implementation, execution_env, crt_version=None, ): """ :type platform_name: str :param platform_name: Name of the operating system or equivalent platform name. Should be sourced from :py:meth:`platform.system`. :type platform_version: str :param platform_version: Version of the operating system or equivalent platform name. Should be sourced from :py:meth:`platform.version`. :type platform_machine: str :param platform_version: Processor architecture or machine type. For example "x86_64". Should be sourced from :py:meth:`platform.machine`. :type python_version: str :param python_version: Version of the python implementation as str. Should be sourced from :py:meth:`platform.python_version`. :type python_implementation: str :param python_implementation: Name of the python implementation. Should be sourced from :py:meth:`platform.python_implementation`. :type execution_env: str :param execution_env: The value of the AWS execution environment. Should be sourced from the ``AWS_EXECUTION_ENV` environment variable. :type crt_version: str :param crt_version: Version string of awscrt package, if installed. """ self._platform_name = platform_name self._platform_version = platform_version self._platform_machine = platform_machine self._python_version = python_version self._python_implementation = python_implementation self._execution_env = execution_env self._crt_version = crt_version # Components that can be added with ``set_session_config()`` self._session_user_agent_name = None self._session_user_agent_version = None self._session_user_agent_extra = None self._client_config = None self._uses_paginator = None self._uses_waiter = None self._uses_resource = None @classmethod def from_environment(cls): crt_version = None if HAS_CRT: crt_version = _get_crt_version() or 'Unknown' return cls( platform_name=platform.system(), platform_version=platform.release(), platform_machine=platform.machine(), python_version=platform.python_version(), python_implementation=platform.python_implementation(), execution_env=os.environ.get('AWS_EXECUTION_ENV'), crt_version=crt_version, ) def set_session_config( self, session_user_agent_name, session_user_agent_version, session_user_agent_extra, ): """ Set the user agent configuration values that apply at session level. :param user_agent_name: The user agent name configured in the :py:class:`botocore.session.Session` object. For backwards compatibility, this will always be at the beginning of the User-Agent string, together with ``user_agent_version``. :param user_agent_version: The user agent version configured in the :py:class:`botocore.session.Session` object. :param user_agent_extra: The user agent "extra" configured in the :py:class:`botocore.session.Session` object. """ self._session_user_agent_name = session_user_agent_name self._session_user_agent_version = session_user_agent_version self._session_user_agent_extra = session_user_agent_extra return self def with_client_config(self, client_config): """ Create a copy with all original values and client-specific values. :type client_config: botocore.config.Config :param client_config: The client configuration object. """ cp = copy(self) cp._client_config = client_config return cp def to_string(self): """ Build User-Agent header string from the object's properties. """ config_ua_override = None if self._client_config: if hasattr(self._client_config, '_supplied_user_agent'): config_ua_override = self._client_config._supplied_user_agent else: config_ua_override = self._client_config.user_agent if config_ua_override is not None: return self._build_legacy_ua_string(config_ua_override) components = [ *self._build_sdk_metadata(), RawStringUserAgentComponent('ua/2.0'), *self._build_os_metadata(), *self._build_architecture_metadata(), *self._build_language_metadata(), *self._build_execution_env_metadata(), *self._build_feature_metadata(), *self._build_config_metadata(), *self._build_app_id(), *self._build_extra(), ] components = modify_components(components) return ' '.join([comp.to_string() for comp in components]) def _build_sdk_metadata(self): """ Build the SDK name and version component of the User-Agent header. For backwards-compatibility both session-level and client-level config of custom tool names are honored. If this removes the Botocore information from the start of the string, Botocore's name and version are included as a separate field with "md" prefix. """ sdk_md = [] if ( self._session_user_agent_name and self._session_user_agent_version and ( self._session_user_agent_name != _USERAGENT_SDK_NAME or self._session_user_agent_version != botocore_version ) ): sdk_md.extend( [ UserAgentComponent( self._session_user_agent_name, self._session_user_agent_version, ), UserAgentComponent( 'md', _USERAGENT_SDK_NAME, botocore_version ), ] ) else: sdk_md.append( UserAgentComponent(_USERAGENT_SDK_NAME, botocore_version) ) if self._crt_version is not None: sdk_md.append( UserAgentComponent('md', 'awscrt', self._crt_version) ) return sdk_md def _build_os_metadata(self): """ Build the OS/platform components of the User-Agent header string. For recognized platform names that match or map to an entry in the list of standardized OS names, a single component with prefix "os" is returned. Otherwise, one component "os/other" is returned and a second with prefix "md" and the raw platform name. String representations of example return values: * ``os/macos#10.13.6`` * ``os/linux`` * ``os/other`` * ``os/other md/foobar#1.2.3`` """ if self._platform_name is None: return [UserAgentComponent('os', 'other')] plt_name_lower = self._platform_name.lower() if plt_name_lower in _USERAGENT_ALLOWED_OS_NAMES: os_family = plt_name_lower elif plt_name_lower in _USERAGENT_PLATFORM_NAME_MAPPINGS: os_family = _USERAGENT_PLATFORM_NAME_MAPPINGS[plt_name_lower] else: os_family = None if os_family is not None: return [ UserAgentComponent('os', os_family, self._platform_version) ] else: return [ UserAgentComponent('os', 'other'), UserAgentComponent( 'md', self._platform_name, self._platform_version ), ] def _build_architecture_metadata(self): """ Build architecture component of the User-Agent header string. Returns the machine type with prefix "md" and name "arch", if one is available. Common values include "x86_64", "arm64", "i386". """ if self._platform_machine: return [ UserAgentComponent( 'md', 'arch', self._platform_machine.lower() ) ] return [] def _build_language_metadata(self): """ Build the language components of the User-Agent header string. Returns the Python version in a component with prefix "lang" and name "python". The Python implementation (e.g. CPython, PyPy) is returned as separate metadata component with prefix "md" and name "pyimpl". String representation of an example return value: ``lang/python#3.10.4 md/pyimpl#CPython`` """ lang_md = [ UserAgentComponent('lang', 'python', self._python_version), ] if self._python_implementation: lang_md.append( UserAgentComponent('md', 'pyimpl', self._python_implementation) ) return lang_md def _build_execution_env_metadata(self): """ Build the execution environment component of the User-Agent header. Returns a single component prefixed with "exec-env", usually sourced from the environment variable AWS_EXECUTION_ENV. """ if self._execution_env: return [UserAgentComponent('exec-env', self._execution_env)] else: return [] def _build_feature_metadata(self): """ Build the features components of the User-Agent header string. Botocore currently does not report any features. This may change in a future version. """ return [] def _build_config_metadata(self): """ Build the configuration components of the User-Agent header string. Returns a list of components with prefix "cfg" followed by the config setting name and its value. Tracked configuration settings may be added or removed in future versions. """ if not self._client_config or not self._client_config.retries: return [] retry_mode = self._client_config.retries.get('mode') cfg_md = [UserAgentComponent('cfg', 'retry-mode', retry_mode)] if self._client_config.endpoint_discovery_enabled: cfg_md.append(UserAgentComponent('cfg', 'endpoint-discovery')) return cfg_md def _build_app_id(self): """ Build app component of the User-Agent header string. Returns a single component with prefix "app" and value sourced from the ``user_agent_appid`` field in :py:class:`botocore.config.Config` or the ``sdk_ua_app_id`` setting in the shared configuration file, or the ``AWS_SDK_UA_APP_ID`` environment variable. These are the recommended ways for apps built with Botocore to insert their identifer into the User-Agent header. """ if self._client_config and self._client_config.user_agent_appid: return [ UserAgentComponent('app', self._client_config.user_agent_appid) ] else: return [] def _build_extra(self): """User agent string components based on legacy "extra" settings. Creates components from the session-level and client-level ``user_agent_extra`` setting, if present. Both are passed through verbatim and should be appended at the end of the string. Preferred ways to inject application-specific information into botocore's User-Agent header string are the ``user_agent_appid` field in :py:class:`botocore.config.Config`. The ``AWS_SDK_UA_APP_ID`` environment variable and the ``sdk_ua_app_id`` configuration file setting are alternative ways to set the ``user_agent_appid`` config. """ extra = [] if self._session_user_agent_extra: extra.append( RawStringUserAgentComponent(self._session_user_agent_extra) ) if self._client_config and self._client_config.user_agent_extra: extra.append( RawStringUserAgentComponent( self._client_config.user_agent_extra ) ) return extra def _build_legacy_ua_string(self, config_ua_override): components = [config_ua_override] if self._session_user_agent_extra: components.append(self._session_user_agent_extra) if self._client_config.user_agent_extra: components.append(self._client_config.user_agent_extra) return ' '.join(components) def _get_crt_version(): """ This function is considered private and is subject to abrupt breaking changes. """ try: import awscrt return awscrt.__version__ except AttributeError: return None