001/**
002 * Copyright 2015 DuraSpace, Inc.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.fcrepo.http.commons.exceptionhandlers;
017
018import org.apache.commons.codec.binary.Base64;
019import org.fcrepo.kernel.exception.MalformedRdfException;
020
021import javax.ws.rs.core.Link;
022import javax.ws.rs.core.Response;
023import javax.ws.rs.ext.ExceptionMapper;
024import javax.ws.rs.ext.Provider;
025
026import static javax.ws.rs.core.Response.Status.CONFLICT;
027import static javax.ws.rs.core.Response.status;
028import static org.fcrepo.kernel.RdfLexicon.CONSTRAINED_BY;
029
030/**
031 * @author cabeer
032 * @since 9/30/14
033 */
034@Provider
035public class MalformedRdfExceptionMapper implements ExceptionMapper<MalformedRdfException> {
036
037    @Override
038    public Response toResponse(final MalformedRdfException e) {
039        final Link link = Link.fromUri(getConstraintUri(e)).rel(CONSTRAINED_BY.getURI()).build();
040        return status(CONFLICT).entity(e.getMessage()).links(link).build();
041    }
042
043    private static String getConstraintUri(final MalformedRdfException e) {
044        return "data:text/plain;base64," + Base64.encodeBase64String(e.getMessage().getBytes());
045    }
046}