properties.gradle

ext.props = new Properties()

//KEYSTORE CREDENTIALS
def keystoreAuthArray = ["KEYSTORE_ALIAS", "KEY_PASSWORD", "KEYSTORE_PASSWORD"]
if (rootProject.file("keystore.properties").exists()) {
    props.load(rootProject.file("keystore.properties").newDataInputStream())

    keystoreAuthArray.each { arrayProp -> project.ext.set(arrayProp, props.getProperty(arrayProp, "sample"))
    }
} else {
    println("keystore.properties does not exist. The following values are required " + keystoreAuthArray.join(", "))
    keystoreAuthArray.each { arrayProp -> project.ext.set(arrayProp, props.getProperty(arrayProp, "sample_" + arrayProp))
    }
}