using System;
using System.IO;
using System.Net;
using Org.BouncyCastle.X509;
using iTextSharp.text.log;
using iTextSharp.text.error_messages;
/*
 * This file is part of the iText project.
 * Copyright (c) 1998-2012 1T3XT BVBA
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
 *
 * This program 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 Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * you must retain the producer line in every PDF that is created or manipulated
 * using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */

namespace iTextSharp.text.pdf {

    /**
     *
     * @author psoares
     */
    public class CrlClientImp : ICrlClient {
        private static readonly ILogger LOGGER = LoggerFactory.GetLogger(typeof(CrlClientImp));

        public virtual byte[] GetEncoded(X509Certificate checkCert, String url) {
            try {
                if (url == null) {
                    if (checkCert == null)
                        return null;
                    url = PdfPKCS7.GetCrlUrl(checkCert);
                }
                if (url == null)
                    return null;
                HttpWebRequest con = (HttpWebRequest)WebRequest.Create(url);
                HttpWebResponse response = (HttpWebResponse)con.GetResponse();
                if (response.StatusCode != HttpStatusCode.OK)
                    throw new IOException(MessageLocalization.GetComposedMessage("invalid.http.response.1", (int)response.StatusCode));
                //Get Response
                Stream inp = response.GetResponseStream();
                byte[] buf = new byte[1024];
                MemoryStream bout = new MemoryStream();
                while (true) {
                    int n = inp.Read(buf, 0, buf.Length);
                    if (n <= 0)
                        break;
                    bout.Write(buf, 0, n);
                }
                inp.Close();
                return bout.ToArray();
            }
            catch (Exception ex) {
                if (LOGGER.IsLogging(Level.ERROR))
                    LOGGER.Error("CrlClientImp", ex);
            }
            return null;
        }
    }
}