187 lines
5.9 KiB
Python
187 lines
5.9 KiB
Python
# Copyright 2014 Cloudscaling Group, Inc
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import re
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from ec2api import exception
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from ec2api.openstack.common.gettextutils import _
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from ec2api.openstack.common import log as logging
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from ec2api.openstack.common import timeutils
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LOG = logging.getLogger(__name__)
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def resource_type_from_id(context, resource_id):
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"""Get resource type by ID
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Returns a string representation of the Amazon resource type, if known.
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Returns None on failure.
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:param context: context under which the method is called
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:param resource_id: resource_id to evaluate
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"""
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known_types = {
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'i': 'instance',
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'r': 'reservation',
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'vol': 'volume',
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'snap': 'snapshot',
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'ami': 'image',
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'aki': 'image',
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'ari': 'image'
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}
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type_marker = resource_id.split('-')[0]
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return known_types.get(type_marker)
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_c2u = re.compile('(((?<=[a-z])[A-Z])|([A-Z](?![A-Z]|$)))')
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def camelcase_to_underscore(str):
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return _c2u.sub(r'_\1', str).lower().strip('_')
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def _try_convert(value):
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"""Return a non-string from a string or unicode, if possible.
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============= =====================================================
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When value is returns
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============= =====================================================
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zero-length ''
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'None' None
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'True' True case insensitive
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'False' False case insensitive
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'0', '-0' 0
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0xN, -0xN int from hex (positive) (N is any number)
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0bN, -0bN int from binary (positive) (N is any number)
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* try conversion to int, float, complex, fallback value
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"""
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def _negative_zero(value):
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epsilon = 1e-7
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return 0 if abs(value) < epsilon else value
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if len(value) == 0:
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return ''
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if value == 'None':
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return None
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lowered_value = value.lower()
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if lowered_value == 'true':
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return True
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if lowered_value == 'false':
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return False
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for prefix, base in [('0x', 16), ('0b', 2), ('0', 8), ('', 10)]:
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try:
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if lowered_value.startswith((prefix, "-" + prefix)):
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return int(lowered_value, base)
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except ValueError:
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pass
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try:
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return _negative_zero(float(value))
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except ValueError:
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return value
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def dict_from_dotted_str(items):
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"""parse multi dot-separated argument into dict.
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EBS boot uses multi dot-separated arguments like
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BlockDeviceMapping.1.DeviceName=snap-id
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Convert the above into
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{'block_device_mapping': {'1': {'device_name': snap-id}}}
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"""
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args = {}
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for key, value in items:
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parts = key.split(".")
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key = str(camelcase_to_underscore(parts[0]))
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if isinstance(value, str) or isinstance(value, unicode):
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# NOTE(vish): Automatically convert strings back
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# into their respective values
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value = _try_convert(value)
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if len(parts) > 1:
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d = args.get(key, {})
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args[key] = d
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for k in parts[1:-1]:
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k = camelcase_to_underscore(k)
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v = d.get(k, {})
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d[k] = v
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d = v
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d[camelcase_to_underscore(parts[-1])] = value
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else:
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args[key] = value
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return args
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_ms_time_regex = re.compile('^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3,6}Z$')
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def is_ec2_timestamp_expired(request, expires=None):
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"""Checks the timestamp or expiry time included in an EC2 request
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and returns true if the request is expired
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"""
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query_time = None
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timestamp = request.get('Timestamp')
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expiry_time = request.get('Expires')
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def parse_strtime(strtime):
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if _ms_time_regex.match(strtime):
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# NOTE(MotoKen): time format for aws-sdk-java contains millisecond
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time_format = "%Y-%m-%dT%H:%M:%S.%fZ"
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else:
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time_format = "%Y-%m-%dT%H:%M:%SZ"
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return timeutils.parse_strtime(strtime, time_format)
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try:
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if timestamp and expiry_time:
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msg = _("Request must include either Timestamp or Expires,"
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" but cannot contain both")
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LOG.error(msg)
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raise exception.InvalidRequest(msg)
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elif expiry_time:
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query_time = parse_strtime(expiry_time)
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return timeutils.is_older_than(query_time, -1)
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elif timestamp:
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query_time = parse_strtime(timestamp)
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# Check if the difference between the timestamp in the request
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# and the time on our servers is larger than 5 minutes, the
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# request is too old (or too new).
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if query_time and expires:
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return (timeutils.is_older_than(query_time, expires) or
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timeutils.is_newer_than(query_time, expires))
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return False
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except ValueError:
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LOG.audit(_("Timestamp is invalid."))
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return True
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# TODO(Alex) This function is copied as is from original cloud.py. It doesn't
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# check for the prefix which allows any prefix used for any object.
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def ec2_id_to_id(ec2_id):
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"""Convert an ec2 ID (i-[base 16 number]) to an instance id (int)."""
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try:
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return int(ec2_id.split('-')[-1], 16)
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except ValueError:
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raise exception.InvalidEc2Id(ec2_id=ec2_id)
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def id_to_ec2_id(instance_id, template='i-%08x'):
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"""Convert an instance ID (int) to an ec2 ID (i-[base 16 number])."""
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return template % int(instance_id)
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