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fix(yaml-cfn): do not deserialize year-month-date as strings #13745

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merged 2 commits into from
Mar 30, 2021

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Currently, we are using the yaml-1.1 schema when de-serializing YAML documents,
Unfortunately, this has the side effect of treating unquoted parts of the template like '2010-09-09'
as Date objects, instead of just simple strings.
This has been noted by a customer using the cloudformation-include module,
but I assume a very similar problem exists for other places we parse YAML,
like cloudformation-diff.

Switch to the core schema from yaml-1.1,
where those are treated as strings, instead of dates.

Fixes #13709


By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

@skinny85 skinny85 self-assigned this Mar 22, 2021
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gitpod-io bot commented Mar 22, 2021

@mergify mergify bot added the contribution/core This is a PR that came from AWS. label Mar 22, 2021
@@ -54,6 +54,6 @@ const shortForms: yaml_types.Schema.CustomTag[] = [
function parseYamlStrWithCfnTags(text: string): any {
return yaml.parse(text, {
customTags: shortForms,
schema: 'yaml-1.1',
schema: 'core',
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But are we sure using the core schema is not going to break other stuff? I.e: is "No" going to be encoded correctly (read: quoted), or is it going to be encoded YAML-1.2-style (which in Yaml 1.1 is an alias for false?

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Good point! I added a test confirming that No is deserialized correctly (as "No", not false).

Let me know if you want to see some more tests of some edge-cases in the YAML handling!

Currently, we are using the `yaml-1.1` schema when de-serializing YAML documents,
Unfortunately, this has the side effect of treating unquoted parts of the template like '2010-09-09'
as Date objects, instead of just simple strings.
This has been noted by a customer using the cloudformation-include module,
but I assume a very similar problem exists for other places we parse YAML,
like cloudformation-diff.

Switch to the `core` schema from `yaml-1.1`,
where those are treated as strings, instead of dates.

Fixes aws#13709
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mergify bot commented Mar 30, 2021

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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mergify bot commented Mar 30, 2021

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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AWS CodeBuild CI Report

  • CodeBuild project: AutoBuildProject89A8053A-LhjRyN9kxr8o
  • Commit ID: accbded
  • Result: SUCCEEDED
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@mergify mergify bot merged commit ffea818 into aws:master Mar 30, 2021
@skinny85 skinny85 deleted the fix/yaml-strings-as-dates branch March 30, 2021 22:35
hollanddd pushed a commit to hollanddd/aws-cdk that referenced this pull request Mar 31, 2021
Currently, we are using the `yaml-1.1` schema when de-serializing YAML documents,
Unfortunately, this has the side effect of treating unquoted parts of the template like '2010-09-09'
as Date objects, instead of just simple strings.
This has been noted by a customer using the cloudformation-include module,
but I assume a very similar problem exists for other places we parse YAML,
like cloudformation-diff.

Switch to the `core` schema from `yaml-1.1`,
where those are treated as strings, instead of dates.

Fixes aws#13709

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*
hollanddd pushed a commit to hollanddd/aws-cdk that referenced this pull request Aug 26, 2021
Currently, we are using the `yaml-1.1` schema when de-serializing YAML documents,
Unfortunately, this has the side effect of treating unquoted parts of the template like '2010-09-09'
as Date objects, instead of just simple strings.
This has been noted by a customer using the cloudformation-include module,
but I assume a very similar problem exists for other places we parse YAML,
like cloudformation-diff.

Switch to the `core` schema from `yaml-1.1`,
where those are treated as strings, instead of dates.

Fixes aws#13709

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*
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Issue importing with CfnInclude when template do not have quotes
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