package org.gcube.data.transfer.library.utils;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.UUID;

public class Utils {

	/**
	 * Pings a HTTP URL. This effectively sends a HEAD request and returns <code>true</code> if the response code is in 
	 * the 200-399 range.
	 * @param url The HTTP URL to be pinged.
	 * @param timeout The timeout in millis for both the connection timeout and the response read timeout. Note that
	 * the total timeout is effectively two times the given timeout.
	 * @return <code>true</code> if the given HTTP URL has returned response code 200-399 on a HEAD request within the
	 * given timeout, otherwise <code>false</code>.
	 */
	public static boolean pingURL(String url, int timeout) {
	   // url = url.replaceFirst("^https", "http"); // Otherwise an exception may be thrown on invalid SSL certificates.

	    try {
	        HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
	        connection.setConnectTimeout(timeout);
	        connection.setReadTimeout(timeout);
	        connection.setRequestMethod("HEAD");
	        int responseCode = connection.getResponseCode();
	        return (200 <= responseCode && responseCode <= 399);
	    } catch (IOException exception) {
	        return false;
	    }
	}
	
	
	
	public static final String getUniqueString(){
		return UUID.randomUUID().toString();
	}
	
}