[Enhancement]: STS AssumeRoleWithWebIdentity

[DavidSouther]

Background story

Initial request via the Rust SDK: https://github.com/awslabs/aws-sdk-rust/issues/963

What does this example accomplish?

Shows developers how to use Cognito & Web Identities to allow controlled access to AWS resources. This allows using AWS web identity solutions as part of customer's technical stacks.

Which AWS service(s)?

STS

Which AWS SDKs or tools?

• [X] All languages
• [ ] .NET
• [ ] C++
• [ ] Go (v2)
• [ ] Java
• [ ] Java (v2)
• [ ] JavaScript
• [ ] JavaScript (v3)
• [ ] Kotlin
• [ ] PHP
• [ ] Python
• [ ] Ruby
• [ ] Rust
• [ ] Swift
• [ ] Not applicable

Are there existing code examples to leverage?

We don't have a specific example. Here's a bunch of links:

https://docs.aws.amazon.com/sdk-for-rust/latest/dg/rust_sts_code_examples.html

Do you have any reference code?

https://stackoverflow.com/questions/72169867/assume-role-with-webidentity-request-in-java

https://github.com/aws/aws-sdk-java-v2/issues/3110

https://github.com/aws/aws-sdk-go-v2/issues/2015