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# Copyright (C) 2013 Linaro
#
# Author: Milo Casagrande <milo.casagrande@linaro.org>
# This file is part of the Patchmetrics package.
#
# Patchmetrics 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 2 of the License, or
# (at your option) any later version.
#
# Patchmetrics 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 Patchwork; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
import base64
import contextlib
import fcntl
import httplib
import json
import time
import urllib
class CrowdException(Exception):
"""Base class for Crowd exceptions."""
class CrowdNotFoundException(CrowdException):
"""An exception for 404 status."""
class CrowdForbiddenException(CrowdException):
"""An exception for 403 status."""
class CrowdUnauthorizedException(CrowdException):
""" An exception for 401 status."""
class Crowd(object):
"""A Crowd object used to perform query operations."""
def __init__(self, usr, pwd, url):
self._cache = None
self._usr = usr
self._pwd = pwd
assert url.startswith('https://')
_, _, self._host, self._uri = url.split('/', 3)
if ":" in self._host:
self._host, self._port = self._host.split(':')
else:
self._port = 443
self._auth = base64.encodestring(
'%s:%s' % (self._usr, self._pwd)).strip()
self._headers = {
'Authorization': 'Basic ' + self._auth,
'Accept': 'application/json'
}
@contextlib.contextmanager
def cached(self, cache_file):
'''provide a cached version of the api to speed things up'''
with open(cache_file, 'a+') as f:
try:
fcntl.lockf(f, fcntl.LOCK_EX)
f.seek(0)
try:
self._cache = json.load(f)
except:
self._cache = {} # in case things are corrupted
yield
self._cache_clean()
f.truncate(0)
f.seek(0)
json.dump(self._cache, f)
finally:
fcntl.lockf(f, fcntl.LOCK_UN)
self._cache = None
def _cached(self, email):
if self._cache is None:
return None
user = self._cache.get(email)
if user and user['expires'] < time.time():
return None
return user
def _cache_user(self, email, valid):
if self._cache is None:
return None
self._cache[email] = {
'email': email,
'valid': valid,
'expires': time.time() + 60 * 60 * 24 * 7 # one week
}
def _cache_clean(self):
# remove stale entries so file doesn't grow out of hand
now = time.time()
self._cache = {k: v for (k, v) in self._cache.iteritems()
if v['expires'] > now}
def get_user_no_cache(self, email):
params = {'username': email.encode('utf-8')}
resource = '/user?{0}'.format(urllib.urlencode(params))
try:
resp = json.loads(self._get_rest_usermanagement(resource))
except CrowdNotFoundException:
resp = None
return resp
def user_valid(self, email):
user = self._cached(email)
if user:
return user['valid']
valid = self.get_user_no_cache(email) is not None
self._cache_user(email, valid)
return valid
def get_group(self, grp):
resource = '/group/user/nested?' + urllib.urlencode({'groupname': grp})
users = json.loads(self._get_rest_usermanagement(resource))['users']
return [x['name'] for x in users]
def _get_rest_usermanagement(self, resource):
api_url = "/{0}{1}".format(self._uri, resource)
return self._get(api_url)
def _get(self, api_url):
connection = httplib.HTTPSConnection(self._host, self._port)
connection.request("GET", api_url, headers=self._headers)
resp = connection.getresponse()
if resp.status == 200:
return resp.read()
elif resp.status == 404:
raise CrowdNotFoundException('Resource not found')
elif resp.status == 401:
raise CrowdUnauthorizedException(
'Authorization not granted to fulfill the request')
elif resp.status == 403:
raise CrowdForbiddenException(
'Access forbidden to fulfill the request')
else:
raise CrowdException(
'Unknown Crowd status {0}'.format(resp.status))
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