"""
Misc utility functions and constants
"""
import functools
import inspect
import os
import warnings
from textwrap import dedent
import six
from hvac import exceptions
[docs]def raise_for_error(method, url, status_code, message=None, errors=None):
"""Helper method to raise exceptions based on the status code of a response received back from Vault.
:param method: HTTP method of a request to Vault.
:type method: str
:param url: URL of the endpoint requested in Vault.
:type url: str
:param status_code: Status code received in a response from Vault.
:type status_code: int
:param message: Optional message to include in a resulting exception.
:type message: str
:param errors: Optional errors to include in a resulting exception.
:type errors: list | str
:raises: hvac.exceptions.InvalidRequest | hvac.exceptions.Unauthorized | hvac.exceptions.Forbidden |
hvac.exceptions.InvalidPath | hvac.exceptions.RateLimitExceeded | hvac.exceptions.InternalServerError |
hvac.exceptions.VaultNotInitialized | hvac.exceptions.BadGateway | hvac.exceptions.VaultDown |
hvac.exceptions.UnexpectedError
"""
if status_code == 400:
raise exceptions.InvalidRequest(message, errors=errors, method=method, url=url)
elif status_code == 401:
raise exceptions.Unauthorized(message, errors=errors, method=method, url=url)
elif status_code == 403:
raise exceptions.Forbidden(message, errors=errors, method=method, url=url)
elif status_code == 404:
raise exceptions.InvalidPath(message, errors=errors, method=method, url=url)
elif status_code == 429:
raise exceptions.RateLimitExceeded(message, errors=errors, method=method, url=url)
elif status_code == 500:
raise exceptions.InternalServerError(message, errors=errors, method=method, url=url)
elif status_code == 501:
raise exceptions.VaultNotInitialized(message, errors=errors, method=method, url=url)
elif status_code == 502:
raise exceptions.BadGateway(message, errors=errors, method=method, url=url)
elif status_code == 503:
raise exceptions.VaultDown(message, errors=errors, method=method, url=url)
else:
raise exceptions.UnexpectedError(message or errors, method=method, url=url)
[docs]def generate_method_deprecation_message(to_be_removed_in_version, old_method_name, method_name=None, module_name=None):
"""Generate a message to be used when warning about the use of deprecated methods.
:param to_be_removed_in_version: Version of this module the deprecated method will be removed in.
:type to_be_removed_in_version: str
:param old_method_name: Deprecated method name.
:type old_method_name: str
:param method_name: Method intended to replace the deprecated method indicated. This method's docstrings are
included in the decorated method's docstring.
:type method_name: str
:param module_name: Name of the module containing the new method to use.
:type module_name: str
:return: Full deprecation warning message for the indicated method.
:rtype: str
"""
message = "Call to deprecated function '{old_method_name}'. This method will be removed in version '{version}'".format(
old_method_name=old_method_name,
version=to_be_removed_in_version,
)
if method_name is not None and module_name is not None:
message += " Please use the '{method_name}' method on the '{module_name}' class moving forward.".format(
method_name=method_name,
module_name=module_name,
)
return message
[docs]def generate_property_deprecation_message(to_be_removed_in_version, old_name, new_name, new_attribute,
module_name='Client'):
"""Generate a message to be used when warning about the use of deprecated properties.
:param to_be_removed_in_version: Version of this module the deprecated property will be removed in.
:type to_be_removed_in_version: str
:param old_name: Deprecated property name.
:type old_name: str
:param new_name: Name of the new property name to use.
:type new_name: str
:param new_attribute: The new attribute where the new property can be found.
:type new_attribute: str
:param module_name: Name of the module containing the new method to use.
:type module_name: str
:return: Full deprecation warning message for the indicated property.
:rtype: str
"""
message = "Call to deprecated property '{name}'. This property will be removed in version '{version}'".format(
name=old_name,
version=to_be_removed_in_version,
)
message += " Please use the '{new_name}' property on the '{module_name}.{new_attribute}' attribute moving forward.".format(
new_name=new_name,
module_name=module_name,
new_attribute=new_attribute,
)
return message
[docs]def getattr_with_deprecated_properties(obj, item, deprecated_properties):
"""Helper method to use in the getattr method of a class with deprecated properties.
:param obj: Instance of the Class containing the deprecated properties in question.
:type obj: object
:param item: Name of the attribute being requested.
:type item: str
:param deprecated_properties: List of deprecated properties. Each item in the list is a dict with at least a
"to_be_removed_in_version" and "client_property" key to be used in the displayed deprecation warning.
:type deprecated_properties: List[dict]
:return: The new property indicated where available.
:rtype: object
"""
if item in deprecated_properties:
deprecation_message = generate_property_deprecation_message(
to_be_removed_in_version=deprecated_properties[item]['to_be_removed_in_version'],
old_name=item,
new_name=deprecated_properties[item].get('new_property', item),
new_attribute=deprecated_properties[item]['client_property'],
)
warnings.simplefilter('always', DeprecationWarning)
warnings.warn(
message=deprecation_message,
category=DeprecationWarning,
stacklevel=2,
)
warnings.simplefilter('default', DeprecationWarning)
client_property = getattr(obj, deprecated_properties[item]['client_property'])
return getattr(client_property, deprecated_properties[item].get('new_property', item))
raise AttributeError("'{class_name}' has no attribute '{item}'".format(
class_name=obj.__class__.__name__,
item=item,
))
[docs]def deprecated_method(to_be_removed_in_version, new_method=None):
"""This is a decorator which can be used to mark methods as deprecated. It will result in a warning being emitted
when the function is used.
:param to_be_removed_in_version: Version of this module the decorated method will be removed in.
:type to_be_removed_in_version: str
:param new_method: Method intended to replace the decorated method. This method's docstrings are included in the
decorated method's docstring.
:type new_method: function
:return: Wrapped function that includes a deprecation warning and update docstrings from the replacement method.
:rtype: types.FunctionType
"""
def decorator(method):
deprecation_message = generate_method_deprecation_message(
to_be_removed_in_version=to_be_removed_in_version,
old_method_name=method.__name__,
method_name=new_method.__name__,
module_name=inspect.getmodule(new_method).__name__,
)
@functools.wraps(method)
def new_func(*args, **kwargs):
warnings.simplefilter('always', DeprecationWarning) # turn off filter
warnings.warn(
message=deprecation_message,
category=DeprecationWarning,
stacklevel=2,
)
warnings.simplefilter('default', DeprecationWarning) # reset filter
return method(*args, **kwargs)
if new_method:
new_func.__doc__ = """\
{message}
Docstring content from this method's replacement copied below:
{new_docstring}
""".format(
message=deprecation_message,
new_docstring=dedent(new_method.__doc__),
)
else:
new_func.__doc__ = deprecation_message
return new_func
return decorator
[docs]def validate_list_of_strings_param(param_name, param_argument):
"""Validate that an argument is a list of strings.
:param param_name: The name of the parameter being validated. Used in any resulting exception messages.
:type param_name: str | unicode
:param param_argument: The argument to validate.
:type param_argument: list
:return: True if the argument is validated, False otherwise.
:rtype: bool
"""
if param_argument is None:
param_argument = []
if isinstance(param_argument, str):
param_argument = param_argument.split(',')
if not isinstance(param_argument, list) or not all(isinstance(p, str) for p in param_argument):
error_msg = 'unsupported {param} argument provided "{arg}" ({arg_type}), required type: List[str]'
raise exceptions.ParamValidationError(error_msg.format(
param=param_name,
arg=param_argument,
arg_type=type(param_argument),
))
[docs]def list_to_comma_delimited(list_param):
"""Convert a list of strings into a comma-delimited list / string.
:param list_param: A list of strings.
:type list_param: list
:return: Comma-delimited string.
:rtype: str
"""
if list_param is None:
list_param = []
return ','.join(list_param)
[docs]def get_token_from_env():
"""Get the token from env var, VAULT_TOKEN. If not set, attempt to get the token from, ~/.vault-token
:return: The vault token if set, else None
:rtype: str | None
"""
token = os.getenv('VAULT_TOKEN')
if not token:
token_file_path = os.path.expanduser('~/.vault-token')
if os.path.exists(token_file_path):
with open(token_file_path, 'r') as f_in:
token = f_in.read().strip()
if not token:
return None
return token
[docs]def comma_delimited_to_list(list_param):
"""Convert comma-delimited list / string into a list of strings
:param list_param: Comma-delimited string
:type list_param: str | unicode
:return: A list of strings
:rtype: list
"""
if isinstance(list_param, list):
return list_param
if isinstance(list_param, str):
return list_param.split(',')
else:
return []
[docs]def remove_nones(params):
"""Removes None values from optional arguments in a parameter dictionary.
:param params: The dictionary of parameters to be filtered.
:type params: dict
:return: A filtered copy of the parameter dictionary.
:rtype: dict
"""
return {
key: value
for key, value in params.items()
if value is not None
}