cfn_lint_cloudformation_template_string_validation.py

1from cfnlint import decode, core
2
3# The CloudFormation template as a string
4template_content = """
5AWSTemplateFormatVersion: '2010-09-09'
6Resources:
7  MyBucket:
8    Type: AWS::S3::Bucket
9    Properties:
10      BucketName: !Ref MyParameter
11"""
12
13# 1. Decode the template (handles both YAML and JSON)
14# The second argument is the filename (optional, used for error reporting)
15template, errors = decode.decode(template_content)
16
17# 2. If there are no decoding errors, run the linter rules
18if not errors:
19    # Use the default configuration and ruleset
20    config = core.get_config_values([])
21    rules = core.get_rules([], config.ignore_checks, config.include_checks, config.configure_rules, config.include_experimental)
22    
23    # Run the checks
24    errors = core.run_checks(
25        None, # Filename (None for string input)
26        template,
27        rules,
28        ['us-east-1'] # Region to validate against
29    )
30
31# 3. Print the results
32for error in errors:
33    print(error)