AccessDeniedExceptionMapper.java

package com.devicehive.resource.exceptions;

/*
 * #%L
 * DeviceHive Java Server Common business logic
 * %%
 * Copyright (C) 2016 DataArt
 * %%
 * Licensed 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.
 * #L%
 */

import com.devicehive.configuration.Constants;
import com.devicehive.configuration.Messages;
import com.devicehive.model.ErrorResponse;
import org.springframework.security.access.AccessDeniedException;

import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;
import java.util.Optional;

@Provider
public class AccessDeniedExceptionMapper implements ExceptionMapper<AccessDeniedException> {

    @Context
    private HttpServletRequest request;

    @Override
    public Response toResponse(AccessDeniedException exception) {
        String realm = Optional.ofNullable(request.getHeader(HttpHeaders.AUTHORIZATION))
                .map(authHeader -> {
                    if (authHeader.startsWith(Constants.TOKEN_SCHEME)) {
                        return Messages.OAUTH_REALM;
                    } else {
                        return Messages.BASIC_REALM;
                    }
                }).orElse(Messages.BASIC_REALM);
        return Response.status(Response.Status.UNAUTHORIZED)
                .type(MediaType.APPLICATION_JSON_TYPE)
                .header(HttpHeaders.WWW_AUTHENTICATE, realm)
                .entity(new ErrorResponse(Response.Status.UNAUTHORIZED.getStatusCode(), "Unauthorized"))
                .build();
    }

}