63 lines
2.3 KiB
Python
63 lines
2.3 KiB
Python
#
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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 netaddr
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import re
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from heat.common.i18n import _
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DNS_LABEL_MAX_LEN = 63
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DNS_LABEL_REGEX = "[a-z0-9-]{1,%d}$" % DNS_LABEL_MAX_LEN
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FQDN_MAX_LEN = 255
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def is_prefix_subset(orig_prefixes, new_prefixes):
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"""Check whether orig_prefixes is subset of new_prefixes.
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This takes valid prefix lists for orig_prefixes and new_prefixes,
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returns 'True', if orig_prefixes is subset of new_prefixes.
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"""
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orig_set = netaddr.IPSet(orig_prefixes)
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new_set = netaddr.IPSet(new_prefixes)
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return orig_set.issubset(new_set)
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def validate_dns_format(data):
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if not data:
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return
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trimmed = data if not data.endswith('.') else data[:-1]
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if len(trimmed) > FQDN_MAX_LEN:
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raise ValueError(
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_("'%(data)s' exceeds the %(max_len)s character FQDN limit") % {
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'data': trimmed,
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'max_len': FQDN_MAX_LEN})
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names = trimmed.split('.')
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for name in names:
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if not name:
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raise ValueError(_("Encountered an empty component."))
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if name.endswith('-') or name.startswith('-'):
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raise ValueError(
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_("Name '%s' must not start or end with a hyphen.") % name)
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if not re.match(DNS_LABEL_REGEX, name):
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raise ValueError(
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_("Name '%(name)s' must be 1-%(max_len)s characters long, "
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"each of which can only be alphanumeric or "
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"a hyphen.") % {'name': name,
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'max_len': DNS_LABEL_MAX_LEN})
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# RFC 1123 hints that a Top Level Domain(TLD) can't be all numeric.
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# Last part is a TLD, if it's a FQDN.
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if (data.endswith('.') and len(names) > 1
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and re.match("^[0-9]+$", names[-1])):
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raise ValueError(_("TLD '%s' must not be all numeric.") % names[-1])
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