/*
 * 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.usergrid.rest.filters;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerRequestFilter;
import javax.ws.rs.container.PreMatching;
import javax.ws.rs.core.Context;
import java.io.IOException;

import static org.apache.commons.lang.StringUtils.isNotBlank;


@Resource
@PreMatching
@Component
public class JSONPCallbackFilter implements ContainerRequestFilter {

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

    @Context
    protected HttpServletRequest httpServletRequest;


    public JSONPCallbackFilter() {
        if (logger.isTraceEnabled()) {
            logger.trace("JSONPCallbackFilter is installed");
        }
    }


    @Override
    public void filter(ContainerRequestContext crc) throws IOException {
        String callback = null;
        try {
            callback = httpServletRequest.getParameter( "callback" );
        }
        catch ( IllegalStateException e ) {
        }
        if ( isNotBlank( callback ) ) {
            crc.getHeaders().putSingle( "Accept", "application/javascript" );
        }
    }
}