aws_cloudfront.CustomOriginConfig not working in Python

I am facing a issue with using aws_cloudfront.CustomOriginConfig in Python. I know this class is still at experimental release, but I would greatly appreciate any help/comments that may resolve my issue.

Reproduction Steps

I am trying to set up a CloudFront distribution with two origins, S3 and API Gateway. Below is the code snippet to prepare the distribution.

import aws_cloudfront as cfront

...

# define cloudfront distribution
distribution = cfront.CloudFrontWebDistribution(
   self, "CloudFrontDistribution",
   origin_configs=[
         cfront.SourceConfiguration(
            s3_origin_source=cfront.S3OriginConfig(
               s3_bucket_source=site_bucket,
               origin_access_identity_id=props.oia.ref
            ),
            behaviors=[cfront.Behavior(is_default_behavior=True)],
         ),
         cfront.SourceConfiguration(
            custom_origin_source=cfront.CustomOriginConfig(
               domain_name=props.apigw_domain_name
            ),
            behaviors=[cfront.Behavior(
               allowed_methods=cfront.CloudFrontAllowedMethods.ALL,
               path_pattern="/api"
            )]
         )
   ],
)

Error Log

Here is the error message I got when I ran cdk synth.

jsii.errors.JSIIError: Got ‘undefined’ for non-optional instance of {“abstract”:true,“docs”:{“remarks”:“Should not include the path - that should be in the parent SourceConfiguration”,“stability”:“experimental”,“summary”:“The domain name of the custom origin.”},“immutable”:true,“locationInModule”:{“filename”:“lib/web_distribution.ts”,“line”:179},“name”:“domainName”,“type”:{“primitive”:“string”}}

If I delete the CustomOriginConfig part (i.e. only with S3 origin), the build succeeds.

I am thinking that this may be a bug in the CDK. Or, am I using the functions in a wrong way?

Environment

• **CLI Version : CDK v1.15
• Framework Version:
• **OS : Ubuntu 16.04 LTS
• **Language : Python 3.7

Other

---

This is 🐛 Bug Report

[eladb]

@tomomano api.domainName refers to a DomainName object which is relevant when using custom domains.

This property may be null in case your APIGW does not have a custom domain. If it’s not null (which seems to be the case), and you want the actual domain name, you will need to use the api.domain_name.domain_name property.

Please reopen if this doesn’t help resolve the issue.

[toleabivol]

ok - figured it out :

oai = cloudfront.CfnCloudFrontOriginAccessIdentity(
            self, f'origin-access-identity-{stage}-{app_name}-{version}',
            cloud_front_origin_access_identity_config=cloudfront.CfnCloudFrontOriginAccessIdentity
            .CloudFrontOriginAccessIdentityConfigProperty(
                comment=f'origin-access-identity-{stage}-{app_name}-{version}'
            )
        )