GetDatastreamHistory.java example

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/* The contents of this file are subject to the license and copyright terms
 * detailed in the license directory at the root of the source tree (also
 * available online at http://fedora-commons.org/license/).
 */
package org.fcrepo.server.security.xacml.pep.rest.objectshandlers;

import java.io.IOException;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;

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

import org.fcrepo.common.Constants;
import org.fcrepo.server.security.RequestCtx;
import org.fcrepo.server.security.xacml.pep.PEPException;
import org.fcrepo.server.security.xacml.pep.ResourceAttributes;
import org.fcrepo.server.security.xacml.pep.rest.filters.AbstractFilter;
import org.fcrepo.server.security.xacml.util.LogUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.jboss.security.xacml.sunxacml.attr.AttributeValue;

/**
* Handles REST API method getDatastreamHistory
*
* @author Stephen Bayliss
* @version $$Id$$
*/
public class GetDatastreamHistory
extends AbstractFilter {

    public GetDatastreamHistory()
            throws PEPException {
        super();
    }

    private static final Logger logger =
            LoggerFactory.getLogger(GetDatastreamHistory.class);

    @Override
    public RequestCtx handleRequest(HttpServletRequest request,
                                    HttpServletResponse response)
            throws IOException, ServletException {
        if (logger.isDebugEnabled()) {
            logger.debug("{}/handleRequest!", this.getClass().getName());
        }

        String[] parts = getPathParts(request);
        // -/objects/{pid}/datastreams/{dsID}/history
        if (parts.length < 5) {
            logger.error("Not enough path components on the URI: {}", request.getRequestURI());
            throw new ServletException("Not enough path components on the URI: " + request.getRequestURI());
        }

        RequestCtx req = null;
        Map<URI, AttributeValue> actions = new HashMap<URI, AttributeValue>();
        Map<URI, AttributeValue> resAttr;
        try {
            resAttr = ResourceAttributes.getResources(parts);

            actions.put(Constants.ACTION.ID.getURI(),
                        Constants.ACTION.GET_DATASTREAM_HISTORY
                                .getStringAttribute());
            actions.put(Constants.ACTION.API.getURI(),
                        Constants.ACTION.APIM.getStringAttribute());

            req =
                    getContextHandler().buildRequest(getSubjects(request),
                                                     actions,
                                                     resAttr,
                                                     getEnvironment(request));

            LogUtil.statLog(request.getRemoteUser(),
                            Constants.ACTION.GET_DATASTREAM_HISTORY.uri,
                            parts[1],
                            parts[3]);
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
            throw new ServletException(e.getMessage(), e);
        }

        return req;
    }

}