Groovy Script to get city name by IP

gistfile1.groovy

def cityByIP = { ip, provider, apikey ->
     if(provider == "ip-api") {
          String urlStr = "http://ip-api.com/json/${ip}?callback=yourfunction"    
          try {
               def data = new URL(urlStr).getText()

               int indexOfCity = data.indexOf('city')
               indexOfCity += 'city":"'.size()
               int indexOfCountry = data.indexOf('country')    
               indexOfCountry -= '","'.size()         

               return data.substring(indexOfCity, indexOfCountry)

          } catch (java.io.IOException e) {
               println "error:" + urlStr
               return nil
          }
         

     } else if(provider == "infodb") {

          String urlStr = "http://api.ipinfodb.com/v3/ip-city/?key=${apikey}&ip=${ip}&format=json"
          try {
               def data = new URL(urlStr).getText()
               println data    
               int indexOfCity = data.indexOf('cityName')
               indexOfCity += '"cityName": "'.size()
               int indexOfCountry = data.indexOf('zipCode')    
               indexOfCountry -= '",  "'.size()

               return data.substring(indexOfCity, indexOfCountry)


          } catch (java.io.IOException e) {
               println "error:" + urlStr
               return nil
          }

         
         
     }
     return nil
}