net.gplatform.sudoor.server.security.model.MultipleReadRequestWrapper.java Source code

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Here is the source code for net.gplatform.sudoor.server.security.model.MultipleReadRequestWrapper.java

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package net.gplatform.sudoor.server.security.model;

/*
 * #%L
 * sudoor-server-lib
 * %%
 * Copyright (C) 2013 - 2014 Shark Xu
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 2 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-2.0.html>.
 * #L%
 */

import java.io.ByteArrayInputStream;
import java.io.IOException;

import javax.servlet.ServletInputStream;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * No empty constructor so can not use annotation Component
 * @author xufucheng
 *
 */
public class MultipleReadRequestWrapper extends HttpServletRequestWrapper {

    final Logger logger = LoggerFactory.getLogger(MultipleReadRequestWrapper.class);

    byte[] bContent;

    public MultipleReadRequestWrapper(HttpServletRequest request) {
        super(request);
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        prepareInputStream();

        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bContent);
        ServletInputStream inputStream = new ServletInputStream() {
            public int read() throws IOException {
                return byteArrayInputStream.read();
            }
        };
        return inputStream;
    }

    private void prepareInputStream() {
        if (bContent == null) {
            try {
                ServletRequest oReq = getRequest();
                bContent = IOUtils.toByteArray(oReq.getInputStream());
            } catch (IOException e) {
                logger.error("Can not read origin request input stream", e);
            }
        }
    }
}