Base64 encode and decode strings in Groovy

import java.util.Base64

String encode(String text) {
    Base64.getEncoder().encodeToString(text.getBytes('UTF-8'))
}

String decode(String encoded) {
    try {
        new String(Base64.getDecoder().decode(encoded), 'UTF-8')
    } catch (IllegalArgumentException e) {
        throw new IllegalArgumentException("invalid base64 input: ${e.message}", e)
    }
}

def encoded = encode('hello groovy')
println encoded
println decode(encoded)