com.woonoz.proxy.servlet.HttpEntityEnclosingRequestHandler.java Source code

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Here is the source code for com.woonoz.proxy.servlet.HttpEntityEnclosingRequestHandler.java

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/*
 * Copyright 2010 Woonoz S.A.S.
 * 
 * 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 com.woonoz.proxy.servlet;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.IOUtils;
import org.apache.http.HttpEntity;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
import org.apache.http.entity.BufferedHttpEntity;
import org.apache.http.entity.InputStreamEntity;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.ContentBody;
import org.apache.http.entity.mime.content.InputStreamBody;
import org.apache.http.entity.mime.content.StringBody;

public abstract class HttpEntityEnclosingRequestHandler extends HttpRequestHandler {

    public HttpEntityEnclosingRequestHandler(HttpServletRequest request, HttpServletResponse response,
            URL targetServer, HttpClient client) {
        super(request, response, targetServer, client);
    }

    protected abstract HttpEntityEnclosingRequestBase createHttpRequestBase(URI targetUri);

    @Override
    protected HttpEntityEnclosingRequestBase createHttpCommand(URI targetUri,
            ClientHeadersHandler clientHeadersHandler)
            throws InvalidCookieException, URISyntaxException, FileUploadException, IOException {
        HttpEntityEnclosingRequestBase httpEntityEnclosingRequestBase = createHttpRequestBase(targetUri);
        copyHeaders(getRequest(), httpEntityEnclosingRequestBase, clientHeadersHandler);
        copyData(getRequest(), httpEntityEnclosingRequestBase);
        return httpEntityEnclosingRequestBase;
    }

    protected ClientHeadersHandler createClientHeadersHandler(final UrlRewriter urlRewriter) {
        return new HttpEntityEnclosingHeadersHandler(urlRewriter);
    }

    private void copyData(HttpServletRequest request, HttpEntityEnclosingRequestBase httpEntityEnclosingRequestBase)
            throws FileUploadException, IOException {
        HttpEntity entity = createHttpEntity(request);
        httpEntityEnclosingRequestBase.setEntity(entity);
    }

    private HttpEntity createHttpEntity(HttpServletRequest request) throws FileUploadException, IOException {
        if (ServletFileUpload.isMultipartContent(request)) {
            return createMultipartEntity(request);
        } else {
            return new BufferedHttpEntity(
                    new InputStreamEntity(request.getInputStream(), request.getContentLength()));
        }
    }

    private HttpEntity createMultipartEntity(HttpServletRequest request) throws FileUploadException, IOException {
        DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();
        ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);
        MultipartEntity multipartEntity = new MultipartEntity();
        FileItemIterator iterator = servletFileUpload.getItemIterator(request);
        while (iterator.hasNext()) {
            FileItemStream fileItem = iterator.next();
            final String partName = fileItem.getFieldName();
            if (fileItem.isFormField()) {
                multipartEntity.addPart(partName, buildStringBody(fileItem));
            } else {
                multipartEntity.addPart(partName, buildContentBodyFromFileItem(fileItem));
            }
        }
        return multipartEntity;
    }

    private StringBody buildStringBody(FileItemStream fileItem) throws UnsupportedEncodingException, IOException {
        return new StringBody(IOUtils.toString(fileItem.openStream()));
    }

    private ContentBody buildContentBodyFromFileItem(FileItemStream fileItem) throws IOException {
        final String partName = fileItem.getFieldName();
        final String contentType = getContentTypeForFileItem(fileItem);
        return new InputStreamBody(BufferOnCreateInputStream.create(fileItem.openStream()), contentType, partName);
    }

    private String getContentTypeForFileItem(FileItemStream fileItem) {
        final String contentType = fileItem.getContentType();
        if (contentType != null) {
            return contentType;
        } else {
            if (fileItem.isFormField()) {
                return "text/plain";
            } else {
                return "application/octet-stream";
            }
        }
    }
}