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/**
 * Copyright (C) 2011 Ovea 
 *
 * 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 com.ovea.tadjin.util.jersey;

import com.google.inject.Injector;
import com.mycila.inject.web.HttpContext;
import com.sun.jersey.guice.spi.container.servlet.GuiceContainer;
import org.eclipse.jetty.util.IO;

import javax.inject.Inject;
import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * @author Mathieu Carbou ([email protected])
 */
public class JerseyServlet extends GuiceContainer {

    @Inject
    public JerseyServlet(Injector injector) {
        super(injector);
    }

    @Override
    public void service(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException {
        // first consumes requets parameters before jersey processing.
        // See this issue: http://jersey.576304.n2.nabble.com/Jersey-empties-request-getParameterMap-with-POST-td4254182.html
        request.getParameterMap();
        final HttpServletRequestWrapper wrappedRequest = new HttpServletRequestWrapper(request) {
            ByteArrayOutputStream baos;

            @Override
            public ServletInputStream getInputStream() throws IOException {
                if (baos == null) {
                    baos = new ByteArrayOutputStream();
                    IO.copy(request.getInputStream(), baos);
                }
                return new ServletInputStream() {
                    InputStream in = new ByteArrayInputStream(baos.toByteArray());

                    @Override
                    public int read() throws IOException {
                        return in.read();
                    }
                };
            }

            @Override
            public String toString() {
                return HttpServletRequestWrapper.class.getSimpleName() + "[" + getRequestURI() + "]";
            }
        };

        HttpContext.change(wrappedRequest, response);
        try {
            super.service(wrappedRequest, response);
        } finally {
            HttpContext.end();
        }
    }

}