forked from aws-cloudformation/cfn-lint
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathAllowedPattern.py
119 lines (102 loc) · 6.11 KB
/
AllowedPattern.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
"""
Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""
import re
from cfnlint.rules import CloudFormationLintRule
from cfnlint.rules import RuleMatch
from cfnlint.helpers import RESOURCE_SPECS
class AllowedPattern(CloudFormationLintRule):
"""Check if parameters have a valid value"""
id = 'W2031'
shortdesc = 'Check if parameters have a valid value based on an allowed pattern'
description = 'Check if parameters have a valid value in a pattern. The Parameter\'s allowed pattern is based on the usages in property (Ref)'
source_url = 'https://github.com/aws-cloudformation/cfn-python-lint/blob/main/docs/cfn-resource-specification.md#allowedpattern'
tags = ['parameters', 'resources', 'property', 'allowed pattern']
def initialize(self, cfn):
"""Initialize the rule"""
for resource_type_spec in RESOURCE_SPECS.get(cfn.regions[0]).get('ResourceTypes'):
self.resource_property_types.append(resource_type_spec)
for property_type_spec in RESOURCE_SPECS.get(cfn.regions[0]).get('PropertyTypes'):
self.resource_sub_property_types.append(property_type_spec)
def check_value_ref(self, value, path, **kwargs):
"""Check Ref"""
matches = []
cfn = kwargs.get('cfn')
if 'Fn::If' in path:
self.logger.debug(
'Not able to guarentee that the default value hasn\'t been conditioned out')
return matches
if path[0] == 'Resources' and 'Condition' in cfn.template.get(
path[0], {}).get(path[1]):
self.logger.debug(
'Not able to guarentee that the default value '
'hasn\'t been conditioned out')
return matches
allowed_pattern = kwargs.get('value_specs', {}).get('AllowedPattern', {})
allowed_pattern_regex = kwargs.get('value_specs', {}).get('AllowedPatternRegex', {})
allowed_pattern_description = kwargs.get('value_specs', {}).get('AllowedPatternDescription', {})
if allowed_pattern_regex:
if value in cfn.template.get('Parameters', {}):
param = cfn.template.get('Parameters').get(value, {})
parameter_values = param.get('AllowedValues')
default_value = param.get('Default')
parameter_type = param.get('Type')
if isinstance(parameter_type, str):
if ((not parameter_type.startswith('List<')) and
(not parameter_type.startswith('AWS::SSM::Parameter::Value<')) and
parameter_type not in ['CommaDelimitedList', 'List<String>']):
# Check Allowed Values
if parameter_values:
for index, allowed_value in enumerate(parameter_values):
if not re.match(allowed_pattern_regex, str(allowed_value)):
param_path = ['Parameters', value, 'AllowedValues', index]
description = allowed_pattern_description or 'Valid values must match pattern {0}'.format(allowed_pattern)
message = 'You must specify a valid allowed value for {0} ({1}). {2}'
matches.append(RuleMatch(param_path, message.format(
value, allowed_value, description)))
if default_value:
# Check Default, only if no allowed Values are specified in the parameter (that's covered by E2015)
if not re.match(allowed_pattern_regex, str(default_value)):
param_path = ['Parameters', value, 'Default']
description = allowed_pattern_description or 'Valid values must match pattern {0}'.format(allowed_pattern)
message = 'You must specify a valid Default value for {0} ({1}). {2}'
matches.append(RuleMatch(param_path, message.format(
value, default_value, description)))
return matches
def check(self, cfn, properties, value_specs, property_specs, path):
"""Check itself"""
matches = list()
for p_value, p_path in properties.items_safe(path[:]):
for prop in p_value:
if prop in value_specs:
value = value_specs.get(prop).get('Value', {})
if value:
value_type = value.get('ValueType', '')
property_type = property_specs.get('Properties').get(prop).get('Type')
matches.extend(
cfn.check_value(
p_value, prop, p_path,
check_ref=self.check_value_ref,
value_specs=RESOURCE_SPECS.get(cfn.regions[0]).get(
'ValueTypes').get(value_type, {}),
cfn=cfn, property_type=property_type, property_name=prop
)
)
return matches
def match_resource_sub_properties(self, properties, property_type, path, cfn):
"""Match for sub properties"""
matches = list()
specs = RESOURCE_SPECS.get(cfn.regions[0]).get(
'PropertyTypes').get(property_type, {}).get('Properties', {})
property_specs = RESOURCE_SPECS.get(cfn.regions[0]).get('PropertyTypes').get(property_type)
matches.extend(self.check(cfn, properties, specs, property_specs, path))
return matches
def match_resource_properties(self, properties, resource_type, path, cfn):
"""Check CloudFormation Properties"""
matches = list()
specs = RESOURCE_SPECS.get(cfn.regions[0]).get(
'ResourceTypes').get(resource_type, {}).get('Properties', {})
resource_specs = RESOURCE_SPECS.get(cfn.regions[0]).get('ResourceTypes').get(resource_type)
matches.extend(self.check(cfn, properties, specs, resource_specs, path))
return matches