edu.usu.sdl.opencatalog.web.rest.JsonpInterceptor.java Source code

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Here is the source code for edu.usu.sdl.opencatalog.web.rest.JsonpInterceptor.java

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/*
 * Copyright 2014 Space Dynamics Laboratory - Utah State University Research Foundation.
 *
 * 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.
 */

package edu.usu.sdl.opencatalog.web.rest;

import java.io.IOException;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;
import javax.ws.rs.ext.Provider;
import javax.ws.rs.ext.WriterInterceptor;
import javax.ws.rs.ext.WriterInterceptorContext;
import org.apache.commons.lang3.StringUtils;

/**
 * Adds Jsonp Support  to any REST request
 * @author dshurtleff
 */
@Provider
public class JsonpInterceptor implements WriterInterceptor, ContainerResponseFilter {
    private String callback;

    @Override
    public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext)
            throws IOException {
        callback = requestContext.getUriInfo().getQueryParameters().getFirst("callback");
    }

    @Override
    public void aroundWriteTo(WriterInterceptorContext responseContext) throws IOException {
        if (StringUtils.isNotBlank(callback)) {
            responseContext.getOutputStream().write((callback + "(").getBytes());
            responseContext.proceed();
            responseContext.getOutputStream().write(")".getBytes());
        } else {
            responseContext.proceed();
        }
    }

}