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//usr/lib/python2.6/site-packages/boto/auth_handler.py

# Copyright 2010 Google Inc.
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"""
Defines an interface which all Auth handlers need to implement.
"""

from boto.plugin import Plugin

class NotReadyToAuthenticate(Exception):
    pass

class AuthHandler(Plugin):

capability = []

def __init__(self, host, config, provider):
        """Constructs the handlers.
        :type host: string
        :param host: The host to which the request is being sent.

:type config: boto.pyami.Config
        :param config: Boto configuration.

:type provider: boto.provider.Provider
        :param provider: Provider details.

Raises:
            NotReadyToAuthenticate: if this handler is not willing to
                authenticate for the given provider and config.
        """
        pass

def add_auth(self, http_request):
        """Invoked to add authentication details to request.

:type http_request: boto.connection.HTTPRequest
        :param http_request: HTTP request that needs to be authenticated.
        """
        pass