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Milton Community Edition: Supports DAV level 1 and is available on Apache2 license
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package io.milton.http.report;

import io.milton.http.ExistingEntityHandler;
import io.milton.http.HttpManager;
import io.milton.http.Request;
import io.milton.http.Request.Method;
import io.milton.resource.Resource;
import io.milton.http.ResourceHandlerHelper;
import io.milton.http.Response;
import io.milton.http.exceptions.BadRequestException;
import io.milton.http.exceptions.ConflictException;
import io.milton.http.exceptions.NotAuthorizedException;
import io.milton.http.webdav.WebDavResponseHandler;
import io.milton.common.ReadingException;
import io.milton.common.WritingException;
import io.milton.resource.ReportableResource;
import io.milton.http.entity.ByteArrayEntity;
import java.io.IOException;
import java.util.Map;
import java.util.logging.Level;
import org.jdom2.JDOMException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * @author alex
 */
public class ReportHandler implements ExistingEntityHandler {

	private final Logger log = LoggerFactory.getLogger(ReportHandler.class);
	private final WebDavResponseHandler responseHandler;
	private final ResourceHandlerHelper resourceHandlerHelper;
	private final Map reports;

	public ReportHandler(WebDavResponseHandler responseHandler, ResourceHandlerHelper resourceHandlerHelper, Map reports) {
		this.responseHandler = responseHandler;
		this.resourceHandlerHelper = resourceHandlerHelper;
		this.reports = reports;
	}

	@Override
	public String[] getMethods() {
		return new String[]{Method.REPORT.code};
	}

	@Override
	public void process(HttpManager httpManager, Request request, Response response) throws ConflictException, NotAuthorizedException, BadRequestException {
		resourceHandlerHelper.process(httpManager, request, response, this);
	}

	@Override
	public void processResource(HttpManager manager, Request request, Response response, Resource r) throws NotAuthorizedException, ConflictException, BadRequestException {
		resourceHandlerHelper.processResource(manager, request, response, r, this);
	}

	@Override
	public void processExistingResource(HttpManager manager, Request request, Response response, Resource resource) throws NotAuthorizedException, BadRequestException, ConflictException {
		try {
			org.jdom2.input.SAXBuilder builder = new org.jdom2.input.SAXBuilder();
			// Prevent possibily of malicious clients using remote the parser to load remote resources
			builder.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
			builder.setExpandEntities(false);
			org.jdom2.Document doc = builder.build(request.getInputStream());
			String reportName = doc.getRootElement().getName();
			Report r = reports.get(reportName);
			if (r == null) {
				log.error("report not known: " + reportName);
				throw new BadRequestException(resource);
			} else {
				log.info("process report: " + reportName + " with : " + r.getClass());
				String xml = r.process(request.getHostHeader(), request.getAbsolutePath(), resource, doc);
				if(log.isTraceEnabled()) {
					log.trace("Report XML:\n" + xml);
				}
				response.setStatus(Response.Status.SC_MULTI_STATUS);
				response.setContentTypeHeader("text/xml");
				response.setEntity(new ByteArrayEntity(xml.getBytes("UTF-8")));
			}
		} catch (JDOMException ex) {
			java.util.logging.Logger.getLogger(ReportHandler.class.getName()).log(Level.SEVERE, null, ex);
		} catch (WritingException ex) {
			throw new RuntimeException(ex);
		} catch (IOException ex) {
			throw new RuntimeException(ex);
		}
    }

	@Override
	public boolean isCompatible(Resource res) {
		return (res instanceof ReportableResource);
	}
}