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/*
* This file is part of *** M y C o R e ***
* See http://www.mycore.de/ for details.
*
* MyCoRe 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.
*
* MyCoRe 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 MyCoRe. If not, see .
*/
package org.mycore.frontend.servlets;
import static org.mycore.access.MCRAccessManager.PERMISSION_READ;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.transform.TransformerException;
import org.mycore.access.MCRAccessManager;
import org.mycore.common.MCRException;
import org.mycore.common.MCRSession;
import org.mycore.common.MCRSessionMgr;
import org.mycore.common.content.MCRContent;
import org.mycore.datamodel.common.MCRXMLMetadataManager;
import org.mycore.datamodel.ifs2.MCRMetadataStore;
import org.mycore.datamodel.ifs2.MCRVersioningMetadataStore;
import org.mycore.datamodel.metadata.MCRMetadataManager;
import org.mycore.datamodel.metadata.MCRObjectID;
import org.xml.sax.SAXException;
/**
* Serves a given MCROBject.
* .../receive/{MCRObjectID}
*
* @author Thomas Scheffler (yagee)
*/
public class MCRObjectServlet extends MCRContentServlet {
private static final long serialVersionUID = 1L;
private static final int REV_CURRENT = 0;
private static final String I18N_ERROR_PREFIX = "component.base.error";
private MCRXMLMetadataManager metadataManager = null;
@Override
public void init() throws ServletException {
super.init();
metadataManager = MCRXMLMetadataManager.instance();
}
@Override
public MCRContent getContent(final HttpServletRequest req, final HttpServletResponse resp) throws IOException {
final MCRObjectID mcrid = getMCRObjectID(req, resp);
if (mcrid == null) {
return null;
}
if (!MCRAccessManager.checkPermission(mcrid, PERMISSION_READ)) { // check read permission for ID
final MCRSession currentSession = MCRSessionMgr.getCurrentSession();
resp.sendError(
HttpServletResponse.SC_UNAUTHORIZED,
getErrorI18N(I18N_ERROR_PREFIX, "accessDenied", mcrid.toString(), currentSession.getUserInformation()
.getUserID(), currentSession.getCurrentIP()));
return null;
}
long rev = REV_CURRENT;
final String revision = getProperty(req, "r");
if (revision != null) {
rev = Long.parseLong(revision);
}
MCRContent localObject = (rev == REV_CURRENT) ? requestLocalObject(mcrid, resp)
: requestVersionedObject(mcrid,
resp, rev);
if (localObject == null) {
return null;
}
try {
return getLayoutService().getTransformedContent(req, resp, localObject);
} catch (TransformerException | SAXException e) {
throw new IOException(e);
}
}
private MCRContent requestLocalObject(MCRObjectID mcrid, final HttpServletResponse resp) throws IOException {
if (MCRMetadataManager.exists(mcrid)) {
return metadataManager.retrieveContent(mcrid);
}
resp.sendError(HttpServletResponse.SC_NOT_FOUND, getErrorI18N(I18N_ERROR_PREFIX, "notFound", mcrid));
return null;
}
private MCRContent requestVersionedObject(final MCRObjectID mcrid, final HttpServletResponse resp, final long rev)
throws IOException {
MCRXMLMetadataManager xmlMetadataManager = MCRXMLMetadataManager.instance();
MCRMetadataStore metadataStore = xmlMetadataManager.getStore(mcrid, true);
if (metadataStore instanceof MCRVersioningMetadataStore) {
MCRContent content = xmlMetadataManager.retrieveContent(mcrid, rev);
if (content != null) {
return content;
}
resp.sendError(HttpServletResponse.SC_NOT_FOUND,
getErrorI18N(I18N_ERROR_PREFIX, "revisionNotFound", rev, mcrid));
return null;
}
resp.sendError(HttpServletResponse.SC_BAD_REQUEST, getErrorI18N(I18N_ERROR_PREFIX, "noVersions", mcrid));
return null;
}
private MCRObjectID getMCRObjectID(final HttpServletRequest req, final HttpServletResponse resp)
throws IOException {
final String pathInfo = req.getPathInfo();
final String id = pathInfo == null ? null : pathInfo.substring(1);
MCRObjectID mcrid = null;
if (id != null) {
try {
mcrid = MCRObjectID.getInstance(id); // create Object with given ID, only ID syntax check performed
} catch (final MCRException e) {
// handle exception: invalid ID syntax, set HTTP error 400 "Invalid request"
resp.sendError(HttpServletResponse.SC_BAD_REQUEST, getErrorI18N(I18N_ERROR_PREFIX, "invalidID", id));
return null; // sorry, no object to return
}
}
return mcrid;
}
}