Fetching AWS SecretManager Secret as Integer Value per CDK

Question

I'm trying to fetch the Secret as integer Value (port number) per CDK in order to create another resource. Basically when I need a String value for String parameters everything is working fine, but when I try to parse the String to int in order to provide the number parameter it does not work anymore. The problem is that CDK generates a reference for these values and it cannot be casted to a number value. The question is: is there any way to retrive the Secret Value as number?

Here some code snippets:

SecretManager Object:

const secret = secretsmanager.Secret.fromSecretAttributes(this, "SecretId", {
      secretCompleteArn: someValidSecretArn
    });

Working fine:

host: secret.secretValueFromJson('host').toString()

Not working because the parameter needs to be a number value:

port: secret.secretValueFromJson('port').toString()

Not working because port is null (it is not!), basically the reference cannot be parsed:

port: parseInt(secret.secretValueFromJson('port').toString())

Not working, same as above:

port: +secret.secretValueFromJson('port').toString()

Answer 1

You can use the CDK's Token class to cast the token to a number:

https://docs.aws.amazon.com/cdk/api/v1/docs/@aws-cdk_core.Token.html#static-aswbrnumbervalue

port: cdk.Token.asNumber(secret.secretValueFromJson('port'));

It will be resolved to the proper value at deploy time.