We've added blueprints and examples in 3 languages for Lambda-based custom Authorizers for use in API Gateway.

Not available in the Lambda console. Use the AuthPolicy object to generate and serialize IAM policies for your custom authorizer. See javadoc comments for more details.

Also available in the Lambda console, the NodeJS blueprint makes it easy to generate IAM policies, including Conditions.

Also available in the Lambda console, the Python blueprint includes the AuthPolicy class, which makes generating IAM policies simple and easy to understand.

Not available in the Lambda console. Use the AuthorizerResponse object to generate IAM policies for your custom authorizer. See comments for more details.

Not available in the Lambda console. Using awslabs/aws-lambda-rust-runtime. Use the APIGatewayPolicyBuilder object to generate IAM policies for your custom authorizer. See comments for more details.

For more details, see public documentation for:

• API Gateway Custom Authorizers -- Blog Post -- Developer Guide
• IAM Policy Language -- API Gateway Developer Guide -- Policy Language Reference