com.intuit.data.autumn.web.InputStreamHttpServletRequestWrapper.java Source code

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Here is the source code for com.intuit.data.autumn.web.InputStreamHttpServletRequestWrapper.java

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/*
 * Copyright 2016 Intuit
 *
 * 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.intuit.data.autumn.web;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.ByteArrayInputStream;
import java.io.IOException;

import static org.apache.commons.io.IOUtils.toByteArray;

/**
 * Wrapper object around HttpServletRequest to allow multiple readings of InputStream
 */

public class InputStreamHttpServletRequestWrapper extends HttpServletRequestWrapper {

    private final byte[] body;

    /**
     * Constructs a request object wrapping the given request.
     *
     * @param request inbound request
     * @throws IllegalArgumentException if the request is null
     */

    public InputStreamHttpServletRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);

        body = toByteArray(request.getInputStream());
    }

    /**
     * Return wrapped intput stream
     *
     * @return invalid response stream
     * @throws IOException unintended exception
     */

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body);

        return new ServletInputStream() {
            @Override
            public boolean isFinished() {
                return byteArrayInputStream.available() == 0;
            }

            @Override
            public boolean isReady() {
                return true;
            }

            @Override
            public void setReadListener(ReadListener readListener) {
                throw new UnsupportedOperationException("Not implemented");
            }

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