com.grendelscan.commons.http.apache_overrides.client.CustomRequestContent.java Source code

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Here is the source code for com.grendelscan.commons.http.apache_overrides.client.CustomRequestContent.java

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/*
 * ==================================================================== 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. ====================================================================
 * 
 * This software consists of voluntary contributions made by many individuals on behalf of the Apache Software Foundation. For more information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package com.grendelscan.commons.http.apache_overrides.client;

import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.HttpVersion;
import org.apache.http.ProtocolException;
import org.apache.http.ProtocolVersion;
import org.apache.http.protocol.HTTP;
import org.apache.http.protocol.HttpContext;

/**
 * Based on RequestContent in Apache HttpClient.
 */
public class CustomRequestContent implements HttpRequestInterceptor {

    @Override
    public void process(final HttpRequest request, final HttpContext context) throws HttpException, IOException {
        if (request == null) {
            throw new IllegalArgumentException("HTTP request may not be null");
        }
        if (request instanceof HttpEntityEnclosingRequest) {
            if (request.containsHeader(HTTP.TRANSFER_ENCODING)) {
                request.removeHeaders(HTTP.TRANSFER_ENCODING);
            }
            if (request.containsHeader(HTTP.CONTENT_LEN)) {
                request.removeHeaders(HTTP.CONTENT_LEN);
            }
            ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
            HttpEntity entity = ((HttpEntityEnclosingRequest) request).getEntity();
            if (entity == null) {
                request.addHeader(HTTP.CONTENT_LEN, "0");
                return;
            }
            // Must specify a transfer encoding or a content length
            if (entity.isChunked() || entity.getContentLength() < 0) {
                if (ver.lessEquals(HttpVersion.HTTP_1_0)) {
                    throw new ProtocolException("Chunked transfer encoding not allowed for " + ver);
                }
                request.addHeader(HTTP.TRANSFER_ENCODING, HTTP.CHUNK_CODING);
            } else {
                request.addHeader(HTTP.CONTENT_LEN, Long.toString(entity.getContentLength()));
            }
            // Specify a content type if known
            if (entity.getContentType() != null && !request.containsHeader(HTTP.CONTENT_TYPE)) {
                request.addHeader(entity.getContentType());
            }
            // Specify a content encoding if known
            if (entity.getContentEncoding() != null && !request.containsHeader(HTTP.CONTENT_ENCODING)) {
                request.addHeader(entity.getContentEncoding());
            }
        }
    }

}