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# Copyright (c) 2013 OpenStack Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import errno
import hashlib
import hmac
import os
import time
import six
from six.moves import configparser
from swift import gettext_ as _
from swift.common.utils import get_valid_utf8_str
class ContainerSyncRealms(object):
"""
Loads and parses the container-sync-realms.conf, occasionally
checking the file's mtime to see if it needs to be reloaded.
"""
def __init__(self, conf_path, logger):
self.conf_path = conf_path
self.logger = logger
self.next_mtime_check = 0
self.mtime_check_interval = 300
self.conf_path_mtime = 0
self.data = {}
self.reload()
def reload(self):
"""Forces a reload of the conf file."""
self.next_mtime_check = 0
self.conf_path_mtime = 0
self._reload()
def _reload(self):
now = time.time()
if now >= self.next_mtime_check:
self.next_mtime_check = now + self.mtime_check_interval
try:
mtime = os.path.getmtime(self.conf_path)
except OSError as err:
if err.errno == errno.ENOENT:
log_func = self.logger.debug
else:
log_func = self.logger.error
log_func(_('Could not load %(conf)r: %(error)s') % {
'conf': self.conf_path, 'error': err})
else:
if mtime != self.conf_path_mtime:
self.conf_path_mtime = mtime
try:
conf = configparser.ConfigParser()
conf.read(self.conf_path)
except configparser.ParsingError as err:
self.logger.error(
_('Could not load %(conf)r: %(error)s')
% {'conf': self.conf_path, 'error': err})
else:
try:
self.mtime_check_interval = conf.getfloat(
'DEFAULT', 'mtime_check_interval')
self.next_mtime_check = \
now + self.mtime_check_interval
except configparser.NoOptionError:
self.mtime_check_interval = 300
self.next_mtime_check = \
now + self.mtime_check_interval
except (configparser.ParsingError, ValueError) as err:
self.logger.error(
_('Error in %(conf)r with '
'mtime_check_interval: %(error)s')
% {'conf': self.conf_path, 'error': err})
realms = {}
for section in conf.sections():
realm = {}
clusters = {}
for option, value in conf.items(section):
if option in ('key', 'key2'):
realm[option] = value
elif option.startswith('cluster_'):
clusters[option[8:].upper()] = value
realm['clusters'] = clusters
realms[section.upper()] = realm
self.data = realms
def realms(self):
"""Returns a list of realms."""
self._reload()
return list(self.data.keys())
def key(self, realm):
"""Returns the key for the realm."""
self._reload()
result = self.data.get(realm.upper())
if result:
result = result.get('key')
return result
def key2(self, realm):
"""Returns the key2 for the realm."""
self._reload()
result = self.data.get(realm.upper())
if result:
result = result.get('key2')
return result
def clusters(self, realm):
"""Returns a list of clusters for the realm."""
self._reload()
result = self.data.get(realm.upper())
if result:
result = result.get('clusters')
if result:
result = list(result.keys())
return result or []
def endpoint(self, realm, cluster):
"""Returns the endpoint for the cluster in the realm."""
self._reload()
result = None
realm_data = self.data.get(realm.upper())
if realm_data:
cluster_data = realm_data.get('clusters')
if cluster_data:
result = cluster_data.get(cluster.upper())
return result
def get_sig(self, request_method, path, x_timestamp, nonce, realm_key,
user_key):
"""
Returns the hexdigest string of the HMAC-SHA1 (RFC 2104) for
the information given.
:param request_method: HTTP method of the request.
:param path: The path to the resource (url-encoded).
:param x_timestamp: The X-Timestamp header value for the request.
:param nonce: A unique value for the request.
:param realm_key: Shared secret at the cluster operator level.
:param user_key: Shared secret at the user's container level.
:returns: hexdigest str of the HMAC-SHA1 for the request.
"""
nonce = get_valid_utf8_str(nonce)
realm_key = get_valid_utf8_str(realm_key)
user_key = get_valid_utf8_str(user_key)
# XXX We don't know what is the best here yet; wait for container
# sync to be tested.
if isinstance(path, six.text_type):
path = path.encode('utf-8')
return hmac.new(
realm_key,
b'%s\n%s\n%s\n%s\n%s' % (
request_method.encode('ascii'), path,
x_timestamp.encode('ascii'), nonce, user_key),
hashlib.sha1).hexdigest()
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