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import os
import abc
class Credential(metaclass=abc.ABCMeta):
"""Abstract class to manage credentials"""
@abc.abstractproperty
def username(self):
return None
@abc.abstractproperty
def password(self):
return None
class SimpleCredential(Credential):
"""Simple credentials implementation"""
def __init__(self, username, password):
self._username = username
self._password = password
@property
def username(self):
return self._username
@property
def password(self):
return self._password
class EnvironCredential(Credential):
"""
Source credentials from environment variables.
Actual sourcing is deferred until requested.
Supports comparison by equality.
>>> e1 = EnvironCredential('a', 'b')
>>> e2 = EnvironCredential('a', 'b')
>>> e3 = EnvironCredential('a', 'c')
>>> e1 == e2
True
>>> e2 == e3
False
"""
def __init__(self, user_env_var, pwd_env_var):
self.user_env_var = user_env_var
self.pwd_env_var = pwd_env_var
def __eq__(self, other: object) -> bool:
return vars(self) == vars(other)
def _get_env(self, env_var):
"""Helper to read an environment variable"""
value = os.environ.get(env_var)
if not value:
raise ValueError('Missing environment variable:%s' % env_var)
return value
@property
def username(self):
return self._get_env(self.user_env_var)
@property
def password(self):
return self._get_env(self.pwd_env_var)
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