Read data from local.properties file in gradle script

local.properties.reader.groovy

// 
// read bintray user and api key form gitignored local.properties file
// 
def FILE_LOCAL_PROPERTIES = "local.properties"
Properties localProp = new Properties()
def getFileInDir = { dir -> 
    File ret = new File("$dir$File.separator$FILE_LOCAL_PROPERTIES")
    ret?.exists() ? ret : null
}

def rootLocalPropFile = getFileInDir(project.rootDir)
if (rootLocalPropFile) {
    localProp.load(rootLocalPropFile.newDataInputStream())
}

def localPropFile = getFileInDir(project.projectDir)
if (localPropFile) {
    Properties tmpProp = new Properties()
    tmpProp.load(localPropFile.newDataInputStream())
    localProp.putAll(tmpProp)
}
    
def propLocal = { localProp?.get it }