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# -*- coding: utf-8 -*-
# provier.py
# Copyright (C) 2015 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
LEAP Provider API.
"""
from copy import deepcopy
import re
from urlparse import urlparse
class _MetaActionDispatcher(type):
"""
A metaclass that will create dispatcher methods dynamically for each
action made available by the LEAP provider API.
The new methods will be created according to the values contained in an
`_actions` dictionary, with the following format::
{'action_name': (uri_template, method)}
where `uri_template` is a string that will be formatted with an arbitrary
number of keyword arguments.
Any class that uses this one as its metaclass needs to implement two
private methods::
_get_uri(self, action_name, **extra_params)
_get_method(self, action_name)
Beware that currently they cannot be inherited from bases.
"""
def __new__(meta, name, bases, dct):
def _generate_action_funs(dct):
_get_uri = dct['_get_uri']
_get_method = dct['_get_method']
newdct = deepcopy(dct)
actions = dct['_actions']
def create_uri_fun(action_name):
return lambda self, **kw: _get_uri(
self, action_name=action_name, **kw)
def create_met_fun(action_name):
return lambda self: _get_method(
self, action_name=action_name)
for action in actions:
uri, method = actions[action]
_action_uri = 'get_%s_uri' % action
_action_met = 'get_%s_method' % action
newdct[_action_uri] = create_uri_fun(action)
newdct[_action_met] = create_met_fun(action)
return newdct
newdct = _generate_action_funs(dct)
return super(_MetaActionDispatcher, meta).__new__(
meta, name, bases, newdct)
class BaseProvider(object):
def __init__(self, netloc, version=1):
parsed = urlparse(netloc)
if parsed.scheme != 'https':
raise ValueError(
'ProviderApi needs to be passed a url with https scheme')
self.netloc = parsed.netloc
self.version = version
def get_hostname(self):
return urlparse(self._get_base_url()).hostname
def _get_base_url(self):
return "https://{0}/{1}".format(self.netloc, self.version)
class Api(BaseProvider):
"""
An object that has all the information that a client needs to communicate
with the remote methods exposed by the web API of a LEAP provider.
The actions are described in https://leap.se/bonafide
By using the _MetaActionDispatcher as a metaclass, the _actions dict will
be translated dynamically into a set of instance methods that will allow
getting the uri and method for each action.
The keyword arguments specified in the format string will automatically
raise a KeyError if the needed keyword arguments are not passed to the
dynamically created methods.
"""
# TODO when should the provider-api object be created?
# TODO pass a Provider object to constructor, with autoconf flag.
# TODO make the actions attribute depend on the api version
# TODO missing UPDATE USER RECORD
__metaclass__ = _MetaActionDispatcher
_actions = {
'signup': ('users', 'POST'),
'update_user': ('users/{uid}', 'PUT'),
'handshake': ('sessions', 'POST'),
'authenticate': ('sessions/{login}', 'PUT'),
'logout': ('logout', 'DELETE'),
'vpn_cert': ('cert', 'POST'),
'smtp_cert': ('smtp_cert', 'POST'),
}
# Methods expected by the dispatcher metaclass
def _get_uri(self, action_name, **extra_params):
resource, _ = self._actions.get(action_name)
uri = '{0}/{1}'.format(
bytes(self._get_base_url()),
bytes(resource)).format(**extra_params)
return uri
def _get_method(self, action_name):
_, method = self._actions.get(action_name)
return method
class Discovery(BaseProvider):
"""
Discover basic information about a provider, including the provided
services.
"""
__metaclass__ = _MetaActionDispatcher
_actions = {
'provider_info': ('provider.json', 'GET'),
'configs': ('1/configs.json', 'GET'),
}
api_uri = None
api_port = None
def _get_base_url(self):
if self.api_uri:
base = self.api_uri
else:
base = self.netloc
uri = "https://{0}".format(base)
if self.api_port:
uri = uri + ':%s' % self.api_port
return uri
def get_base_uri(self):
return self._get_base_url()
# Methods expected by the dispatcher metaclass
def _get_uri(self, action_name, **extra_params):
resource, _ = self._actions.get(action_name)
uri = '{0}/{1}'.format(
bytes(self._get_base_url()),
bytes(resource)).format(**extra_params)
return uri
def _get_method(self, action_name):
_, method = self._actions.get(action_name)
return method
def validate_username(username):
accepted_characters = '^[a-z0-9\-\_\.]*$'
if not re.match(accepted_characters, username):
raise ValueError('Only lowercase letters, digits, . - and _ allowed.')
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