New pattern submission - Invoke Private API Custom Domain from Step function Workflow

[sahilk225579]

To submit a template to the Serverless Patterns Collection, submit an issue with the following information.

IMPORTANT
Patterns are intended to be primarily IaC-focused implementations of 2-4 AWS services, with minimum custom code. They should be commonly used combinations that help developers get started quickly. If you have a utility, demo, or application, submit these to the Serverless Repos Collection instead.

ONLY SUBMIT ONE PATTERN CHANGE PER PR. Multiple patterns or files spanning multiple pattern directories will be automatically rejected.

Patterns may take up to 4-6 weeks to review, test, and merge but there is no SLA and can take significantly longer due to other work the team has.

To learn more about submitting a pattern, read the publishing guidelines page.

1. Use the model template located at https://github.com/aws-samples/serverless-patterns/tree/main/_pattern-model to set up a README, template and any associated code.

2. THIS PROCESS HAS BEEN SIMPLIFIED. All the information below must be provided in the "example-pattern.json" file cloned from the model **

Note the following information for the model:

Architecture
__

• Description (intro.text) should be a 300-500 word explanation of how the pattern works.

This serverless pattern demonstrates how to securely invoke a private API with a custom domain from Step function workflow. In this architecture, a state machine uses the arn:aws:states:::http:invoke state with EventBridge Connection to invoke the Private API endpoint.

Using EventBridge connection we can now create connections to private APIs, to access resources in VPCs. This setup ensures that the API remains inaccessible from the public internet while still allowing invocations from AWS resources securely.

The solution leverages AWS Serverless Application Model (SAM) to streamline deployment and configuration of these resources, making it easy to implement this secure, scalable solution.

• Resources should like to AWS documentation and AWS blogs related to the post (1-5 maximum).

Whats new AWS Blog - https://aws.amazon.com/about-aws/whats-new/2024/12/amazon-eventbridge-step-functions-integration-private-apis/
Securely share AWS resources across VPC and account boundaries with PrivateLink, VPC Lattice, EventBridge, and Step Functions - https://aws.amazon.com/blogs/aws/securely-share-aws-resources-across-vpc-and-account-boundaries-with-privatelink-vpc-lattice-eventbridge-and-step-functions/
Call HTTPS APIs in Step Functions workflows - https://docs.aws.amazon.com/step-functions/latest/dg/call-https-apis.html
Custom domain names for private APIs in API Gateway - https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-private-custom-domains.html
Amazon VPC Lattice - https://docs.aws.amazon.com/vpc-lattice/latest/ug/what-is-vpc-lattice.html

• Author bio may include a LinkedIn and/or Twitter reference and a 1-sentence bio.

Name: Sahil Kapoor
Photo URL: https://media.licdn.com/dms/image/v2/D5603AQHTVptga3RxcA/profile-displayphoto-shrink_800_800/B56ZO3ZfseHoAc-/0/1733948735068?e=1739404800&v=beta&t=FX6MFZ2JFH17KQc89u4gY6tQXGoMJLiLkB2qT3MtV2g
Twitter handle: n/a
Linkdin : https://www.linkedin.com/in/sahil-kapoor-503391a7/
Description (up to 255 chars): I am a Cloud Support Engineer at AWS

You must ensure that the sections of the model README.md are completed in full.

GitHub PR for template:

#2544