// --- BEGIN COPYRIGHT BLOCK ---
// This program 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; version 2 of the License.
//
// 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package com.netscape.cms.servlet.csadmin;

import java.io.IOException;
import java.security.cert.CertificateEncodingException;
import java.util.Locale;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.dogtagpki.server.authorization.AuthzToken;
import org.mozilla.jss.netscape.security.util.Utils;

import com.fasterxml.jackson.databind.node.ObjectNode;
import com.netscape.certsrv.authentication.IAuthToken;
import com.netscape.certsrv.authorization.EAuthzAccessDenied;
import com.netscape.certsrv.base.EBaseException;
import com.netscape.certsrv.kra.IKeyRecoveryAuthority;
import com.netscape.certsrv.security.ITransportKeyUnit;
import com.netscape.cms.servlet.base.CMSServlet;
import com.netscape.cms.servlet.base.UserInfo;
import com.netscape.cms.servlet.common.CMSRequest;
import com.netscape.cms.servlet.common.ICMSTemplateFiller;
import com.netscape.cmscore.apps.CMS;
import com.netscape.cmsutil.json.JSONObject;

/**
 * This servlet retrieves the transport certificate from DRM.
 */
public class GetTransportCert extends CMSServlet {

    public static org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(GetTransportCert.class);

    private static final long serialVersionUID = 2495152202191979339L;
    private final static String SUCCESS = "0";
    private final static String AUTH_FAILURE = "2";

    public GetTransportCert() {
        super();
    }

    /**
     * initialize the servlet.
     *
     * @param sc servlet configuration, read from the web.xml file
     */
    @Override
    public void init(ServletConfig sc) throws ServletException {
        logger.debug("GetTransportCert: initializing...");
        super.init(sc);
        logger.debug("GetTransportCert: done initializing...");
    }

    /**
     * Process the HTTP request.
     */
    @Override
    protected void process(CMSRequest cmsReq) throws EBaseException {
        logger.debug("UpdateUpdater: processing...");

        HttpServletResponse httpResp = cmsReq.getHttpResp();

        IAuthToken authToken = null;
        try {
            authToken = authenticate(cmsReq);
            logger.debug("GetTransportCert authentication successful.");
        } catch (Exception e) {
            logger.error("GetTransportCert: authentication failed: " + e.getMessage(), e);
            logger.error(CMS.getLogMessage("CMSGW_ERR_BAD_SERV_OUT_STREAM", "", e.toString()));
            outputError(httpResp, AUTH_FAILURE, "Error: Not authenticated", null);
            return;
        }

        if (authToken == null) {
            logger.error("GetTransportCert: authentication failed.");
            outputError(httpResp, AUTH_FAILURE, "Error: Not authenticated",
                        null);
            return;
        }

        AuthzToken authzToken = null;
        try {
            authzToken = authorize(mAclMethod, authToken, mAuthzResourceName,
                    "read");
            logger.debug("GetTransportCert authorization successful.");
        } catch (EAuthzAccessDenied e) {
            logger.warn(CMS.getLogMessage("ADMIN_SRVLT_AUTH_FAILURE", e.toString()), e);
            outputError(httpResp, "Error: Not authorized");
            return;
        } catch (Exception e) {
            logger.warn(CMS.getLogMessage("ADMIN_SRVLT_AUTH_FAILURE", e.toString()), e);
            outputError(httpResp, "Error: Encountered problem during authorization.");
            return;
        }

        if (authzToken == null) {
            outputError(httpResp, "Error: Not authorized");
            return;
        }

        IKeyRecoveryAuthority kra =
                (IKeyRecoveryAuthority) mAuthority;
        ITransportKeyUnit tu = kra.getTransportKeyUnit();
        org.mozilla.jss.crypto.X509Certificate transportCert =
                tu.getCertificate();

        String mime64 = "";
        try {
            mime64 = Utils.base64encode(transportCert.getEncoded(), true);
            mime64 = org.mozilla.jss.netscape.security.util.Cert.normalizeCertStrAndReq(mime64);
        } catch (CertificateEncodingException eee) {
            logger.warn("GetTransportCert: Failed to encode certificate: " + eee.getMessage(), eee);
        }

        // send success status back to the requestor
        try {
            logger.debug("GetTransportCert: Sending response " + mime64);

            JSONObject jsonObj = new JSONObject();
            ObjectNode responseNode = jsonObj.getMapper().createObjectNode();

            responseNode.put("Status", SUCCESS);
            responseNode.put("TransportCert", mime64);
            jsonObj.getRootNode().set("Response", responseNode);

            outputResult(httpResp, "application/json", jsonObj.toByteArray());
        } catch (Exception e) {
            logger.warn("GetTransportCert: Failed to send the output " + e.getMessage(), e);
        }
    }

    @Override
    protected void setDefaultTemplates(ServletConfig sc) {
    }

    @Override
    protected void renderTemplate(
            CMSRequest cmsReq, String templateName, ICMSTemplateFiller filler)
            throws IOException {// do nothing
    }

    @Override
    protected void renderResult(CMSRequest cmsReq) throws IOException {// do nothing, ie, it will not return the default javascript.
    }

    /**
     * Retrieves locale based on the request.
     */
    @Override
    protected Locale getLocale(HttpServletRequest req) {
        Locale locale = null;
        String lang = req.getHeader("accept-language");

        if (lang == null) {
            // use server locale
            locale = Locale.getDefault();
        } else {
            locale = new Locale(UserInfo.getUserLanguage(lang),
                    UserInfo.getUserCountry(lang));
        }
        return locale;
    }
}
