Add stage variables for Serverless 1.x to ApiGateway, so you can use variables (and CloudFormation references!) in your Lambda's.
custom:
stageVariables:
bucket_name: ${env.BUCKET_NAME}
endpoint: { "Fn::GetAtt": "CloudFrontEndpoint.DomainName" }
foo: bar
plugins:
- serverless-plugin-stage-variables
And then in your lambda's, you can use:
module.exports.foobar = (event, context, cb) => {
// event.stageVariables.bucket_name
// event.stageVariables.endpoint
// event.stageVariables.foo
}