/*
 * 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 org.apache.chemistry.opencmis.server.impl.atompub;

import java.io.OutputStream;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;

import org.apache.chemistry.opencmis.commons.data.Acl;
import org.apache.chemistry.opencmis.commons.enums.AclPropagation;
import org.apache.chemistry.opencmis.commons.enums.CmisVersion;
import org.apache.chemistry.opencmis.commons.exceptions.CmisInvalidArgumentException;
import org.apache.chemistry.opencmis.commons.exceptions.CmisRuntimeException;
import org.apache.chemistry.opencmis.commons.impl.Constants;
import org.apache.chemistry.opencmis.commons.impl.XMLConverter;
import org.apache.chemistry.opencmis.commons.impl.XMLUtils;
import org.apache.chemistry.opencmis.commons.server.CallContext;
import org.apache.chemistry.opencmis.commons.server.CmisService;

/**
 * ACL Service operations.
 */
public class AclService {

    public abstract static class AclServiceCall extends AbstractAtomPubServiceCall {
        protected void writeAclXML(Acl acl, CmisVersion cmisVersion, OutputStream out) throws XMLStreamException {
            XMLStreamWriter writer = XMLUtils.createWriter(out);
            XMLUtils.startXmlDocument(writer);
            XMLConverter.writeAcl(writer, cmisVersion, true, acl);
            XMLUtils.endXmlDocument(writer);
        }
    }

    /**
     * Get ACL.
     */
    public static class GetAcl extends AclServiceCall {
        public void serve(CallContext context, CmisService service, String repositoryId, HttpServletRequest request,
                HttpServletResponse response) throws Exception {
            assert context != null;
            assert service != null;
            assert repositoryId != null;
            assert request != null;
            assert response != null;

            // get parameters
            String objectId = getStringParameter(request, Constants.PARAM_ID);
            Boolean onlyBasicPermissions = getBooleanParameter(request, Constants.PARAM_ONLY_BASIC_PERMISSIONS);

            // execute
            if (stopBeforeService(service)) {
                return;
            }

            Acl acl = service.getAcl(repositoryId, objectId, onlyBasicPermissions, null);

            if (stopAfterService(service)) {
                return;
            }

            if (acl == null) {
                throw new CmisRuntimeException("ACL is null!");
            }

            // set headers
            response.setStatus(HttpServletResponse.SC_OK);
            response.setContentType(Constants.MEDIATYPE_ACL);

            // write XML
            writeAclXML(acl, context.getCmisVersion(), response.getOutputStream());
        }
    }

    /**
     * Apply ACL.
     */
    public static class ApplyAcl extends AclServiceCall {
        public void serve(CallContext context, CmisService service, String repositoryId, HttpServletRequest request,
                HttpServletResponse response) throws Exception {

            // get parameters
            String objectId = getStringParameter(request, Constants.PARAM_ID);
            AclPropagation aclPropagation = getEnumParameter(request, Constants.PARAM_ACL_PROPAGATION,
                    AclPropagation.class);

            Acl aces = null;
            XMLStreamReader parser = null;
            try {
                parser = XMLUtils.createParser(request.getInputStream());
                XMLUtils.findNextStartElemenet(parser);
                aces = XMLConverter.convertAcl(parser);
            } catch (XMLStreamException e) {
                throw new CmisInvalidArgumentException("Invalid request!", e);
            } finally {
                if (parser != null) {
                    try {
                        parser.close();
                    } catch (XMLStreamException e2) {
                        // ignore
                    }
                }
            }

            // execute
            if (stopBeforeService(service)) {
                return;
            }

            Acl acl = service.applyAcl(repositoryId, objectId, aces, aclPropagation);

            if (stopAfterService(service)) {
                return;
            }

            if (acl == null) {
                throw new CmisRuntimeException("ACL is null!");
            }

            // set headers
            response.setStatus(HttpServletResponse.SC_CREATED);
            response.setContentType(Constants.MEDIATYPE_ACL);

            // write XML
            writeAclXML(acl, context.getCmisVersion(), response.getOutputStream());
        }
    }
}