Generate Google Maps hash at end of Gradle build

build.gradle

import java.util.regex.Pattern

def getGoogleMapsHash = { ->
    def pattern = Pattern.compile("SHA1: ([0-9a-fA-F:]+)")
    try {
        def stdOut = new ByteArrayOutputStream()
        exec {
            commandLine "keytool", "-list", "-v", "-keystore", file(STORE_FILE), "-storepass", STORE_PASSWORD
            standardOutput = stdOut
        }
        def hashString = stdOut.toString().trim()
        def matcher = pattern.matcher(hashString)
        matcher.find()
        return matcher.group(1)
    }
    catch (error) {
        return error.toString();
    }
}

gradle.buildFinished {
    println "Google Maps Hash:\n  " + getGoogleMapsHash() + "\n"
}

gradle.properties

STORE_FILE=C:/Keystore.jks
STORE_PASSWORD=password
KEY_ALIAS=keystoreAlias
KEY_PASSWORD=password