/*
 * Copyright (c) 2012, the authors.
 *
 *   This file is part of Blow.
 *
 *   Blow is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   Blow is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with Blow.  If not, see <http://www.gnu.org/licenses/>.
 */

package blow.util

import groovy.util.logging.Slf4j

/**
 *
 *  @author Paolo Di Tommaso <paolo.ditommaso@gmail.com>
 */
@Slf4j
class WebHelper {

    /**
     * Check if the specified URL exists
     *
     * @param sUrl The URL string to check
     */
    static boolean checkURLExists( String sUrl ) {
        try {
            //HttpURLConnection.setFollowRedirects(false);
            // note : you may also need
            //        HttpURLConnection.setInstanceFollowRedirects(false)
            def con = new URL(sUrl).openConnection() as HttpURLConnection;
            con.setRequestMethod("HEAD");
            return con.getResponseCode() == HttpURLConnection.HTTP_OK;
        }
        catch (Exception e) {
            log.warn "Cannot verify URL: '${sUrl}' -- ${e.getMessage()}"
            return false
        }
    }

}
