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/*
 ************************************************************************
 *******************  CANADIAN ASTRONOMY DATA CENTRE  *******************
 **************  CENTRE CANADIEN DE DONNÉES ASTRONOMIQUES  **************
 *
 *  (c) 2014.                            (c) 2014.
 *  Government of Canada                 Gouvernement du Canada
 *  National Research Council            Conseil national de recherches
 *  Ottawa, Canada, K1A 0R6              Ottawa, Canada, K1A 0R6
 *  All rights reserved                  Tous droits réservés
 *
 *  NRC disclaims any warranties,        Le CNRC dénie toute garantie
 *  expressed, implied, or               énoncée, implicite ou légale,
 *  statutory, of any kind with          de quelque nature que ce
 *  respect to the software,             soit, concernant le logiciel,
 *  including without limitation         y compris sans restriction
 *  any warranty of merchantability      toute garantie de valeur
 *  or fitness for a particular          marchande ou de pertinence
 *  purpose. NRC shall not be            pour un usage particulier.
 *  liable in any event for any          Le CNRC ne pourra en aucun cas
 *  damages, whether direct or           être tenu responsable de tout
 *  indirect, special or general,        dommage, direct ou indirect,
 *  consequential or incidental,         particulier ou général,
 *  arising from the use of the          accessoire ou fortuit, résultant
 *  software.  Neither the name          de l'utilisation du logiciel. Ni
 *  of the National Research             le nom du Conseil National de
 *  Council of Canada nor the            Recherches du Canada ni les noms
 *  names of its contributors may        de ses  participants ne peuvent
 *  be used to endorse or promote        être utilisés pour approuver ou
 *  products derived from this           promouvoir les produits dérivés
 *  software without specific prior      de ce logiciel sans autorisation
 *  written permission.                  préalable et particulière
 *                                       par écrit.
 *
 *  This file is part of the             Ce fichier fait partie du projet
 *  OpenCADC project.                    OpenCADC.
 *
 *  OpenCADC is free software:           OpenCADC est un logiciel libre ;
 *  you can redistribute it and/or       vous pouvez le redistribuer ou le
 *  modify it under the terms of         modifier suivant les termes de
 *  the GNU Affero General Public        la “GNU Affero General Public
 *  License as published by the          License” telle que publiée
 *  Free Software Foundation,            par la Free Software Foundation
 *  either version 3 of the              : soit la version 3 de cette
 *  License, or (at your option)         licence, soit (à votre gré)
 *  any later version.                   toute version ultérieure.
 *
 *  OpenCADC is distributed in the       OpenCADC est distribué
 *  hope that it will be useful,         dans l’espoir qu’il vous
 *  but WITHOUT ANY WARRANTY;            sera utile, mais SANS AUCUNE
 *  without even the implied             GARANTIE : sans même la garantie
 *  warranty of MERCHANTABILITY          implicite de COMMERCIALISABILITÉ
 *  or FITNESS FOR A PARTICULAR          ni d’ADÉQUATION À UN OBJECTIF
 *  PURPOSE.  See the GNU Affero         PARTICULIER. Consultez la Licence
 *  General Public License for           Générale Publique GNU Affero
 *  more details.                        pour plus de détails.
 *
 *  You should have received             Vous devriez avoir reçu une
 *  a copy of the GNU Affero             copie de la Licence Générale
 *  General Public License along         Publique GNU Affero avec
 *  with OpenCADC.  If not, see          OpenCADC ; si ce n’est
 *  <http://www.gnu.org/licenses/>.      pas le cas, consultez :
 *                                       <http://www.gnu.org/licenses/>.
 *
 *  $Revision: 4 $
 *
 ************************************************************************
 */
package ca.nrc.cadc.ac.client;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.security.AccessControlContext;
import java.security.AccessControlException;
import java.security.AccessController;
import java.security.Principal;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSocketFactory;
import javax.security.auth.Subject;

import org.apache.log4j.Logger;

import ca.nrc.cadc.ac.Group;
import ca.nrc.cadc.ac.GroupAlreadyExistsException;
import ca.nrc.cadc.ac.GroupNotFoundException;
import ca.nrc.cadc.ac.Role;
import ca.nrc.cadc.ac.User;
import ca.nrc.cadc.ac.UserNotFoundException;
import ca.nrc.cadc.ac.WriterException;
import ca.nrc.cadc.ac.xml.GroupListReader;
import ca.nrc.cadc.ac.xml.GroupReader;
import ca.nrc.cadc.ac.xml.GroupWriter;
import ca.nrc.cadc.auth.AuthenticationUtil;
import ca.nrc.cadc.auth.HttpPrincipal;
import ca.nrc.cadc.auth.SSLUtil;
import ca.nrc.cadc.net.HttpDownload;
import ca.nrc.cadc.net.HttpPost;
import ca.nrc.cadc.net.HttpTransfer;
import ca.nrc.cadc.net.HttpUpload;
import ca.nrc.cadc.net.InputStreamWrapper;
import ca.nrc.cadc.net.NetUtil;
import ca.nrc.cadc.net.event.TransferEvent;
import ca.nrc.cadc.net.event.TransferListener;
import ca.nrc.cadc.reg.client.RegistryClient;
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/**
 * Client class for performing group searching and group actions
 * with the access control web service.
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 */
public class GMSClient implements TransferListener
{
    private static final Logger log = Logger.getLogger(GMSClient.class);
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    // socket factory to use when connecting
    private SSLSocketFactory sslSocketFactory;
    private SSLSocketFactory mySocketFactory;
    // client needs to know which service it is bound to and lookup
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    // endpoints using RegistryClient
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    // storing baseURL is now considered bad form but fix is out of scope right now
    private String baseURL;


    /**
     * Slightly more complete constructor.  Tests can override the
     * RegistryClient.
     *
     * @param serviceURI            The service URI.
     * @param registryClient        The Registry Client.
     */
    public GMSClient(URI serviceURI, RegistryClient registryClient)
            URL base = registryClient.getServiceURL(serviceURI, "https");
            if (base == null)
                throw new IllegalArgumentException("service not found with https access: " + serviceURI);
            this.baseURL = base.toExternalForm();

            log.debug("AC Service URI: " + this.baseURL);
        }
        catch(MalformedURLException ex)
        {
            throw new RuntimeException("BUG: failed to construct GMS base URL", ex);
        }
    }

    public GMSClient(URI serviceURI)
    {
        this(serviceURI, new RegistryClient());
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    /**
     * Constructor.
     * @param baseURL The URL of the supporting access control web service
     * obtained from the registry.
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     * @deprecated
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     */
    public GMSClient(String baseURL)
        throws IllegalArgumentException
    {
        if (baseURL == null)
        {
            throw new IllegalArgumentException("baseURL is required");
        }
        try
        {
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            new URL(baseURL);
        }
        catch (MalformedURLException e)
        {
            throw new IllegalArgumentException("URL is malformed: " +
                                               e.getMessage());
        }

        if (baseURL.endsWith("/"))
        {
            this.baseURL = baseURL.substring(0, baseURL.length() - 1);
        }
        else
        {
            this.baseURL = baseURL;
        }
    }
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