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5804b53bb1
Replace non-capturing group with atomic group in expansion bracket regex to prevent excessive backtracking. Add missing 'object' key to bulk view context for template compatibility.
73 lines
2.5 KiB
Python
73 lines
2.5 KiB
Python
import re
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import netaddr
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from django import forms
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from django.utils.translation import gettext_lazy as _
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from utilities.forms.constants import *
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from utilities.forms.utils import expand_alphanumeric_pattern, expand_ipnetwork_pattern
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__all__ = (
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'ExpandableIPNetworkField',
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'ExpandableNameField',
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)
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class ExpandableNameField(forms.CharField):
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"""
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A field which allows for numeric range expansion
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Example: 'Gi0/[1-3]' => ['Gi0/1', 'Gi0/2', 'Gi0/3']
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"""
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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if not self.help_text:
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self.help_text = _(
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"Alphanumeric ranges are supported for bulk creation. Mixed cases and types within a single range are "
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"not supported (example: <code>[ge,xe]-0/0/[0-9]</code>)."
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)
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def to_python(self, value):
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if not value:
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return ''
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if re.search(ALPHANUMERIC_EXPANSION_PATTERN, value):
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return list(expand_alphanumeric_pattern(value))
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return [value]
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class ExpandableIPNetworkField(forms.CharField):
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"""
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A CharField that expands numeric range patterns in IPv4/IPv6 CIDR notation into multiple entries.
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Examples:
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'192.0.2.[1-254]/32' => ['192.0.2.1/32', '192.0.2.2/32', ...]
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'10.[0-3,10-13].0.0/16' => ['10.0.0.0/16', '10.1.0.0/16', ..., '10.10.0.0/16', ...]
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'2001:db8:[0-f]::/64' => ['2001:db8:0::/64', '2001:db8:1::/64', ...]
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"""
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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if not self.help_text:
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self.help_text = _(
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'Use bracket notation to specify numeric ranges for bulk creation (CIDR required).<br />'
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'Examples: <code>192.0.2.[1-10]/32</code>, <code>10.[0-3,10-13].0.0/16</code>, '
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'<code>2001:db8:[a-f]::/64</code>'
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)
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def to_python(self, value):
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if not value:
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return [value]
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# Replace expansion brackets with a neutral value to get a parseable IP/CIDR
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stripped = re.sub(r'(?>\[[^\]]+\])', '0', value)
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try:
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family = netaddr.IPNetwork(stripped).version
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except (netaddr.AddrFormatError, ValueError):
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return [value]
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if family == 4 and re.search(IP4_EXPANSION_PATTERN, value):
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return list(expand_ipnetwork_pattern(value, 4))
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if family == 6 and re.search(IP6_EXPANSION_PATTERN, value):
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return list(expand_ipnetwork_pattern(value.lower(), 6))
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return [value]
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