content: /**
   * ﻿Copyright (C) 2007 - 2019 52°North Initiative for Geospatial Open Source
   * Software GmbH
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published
   * by the Free Software Foundation.
   *
   * If the program is linked with libraries which are licensed under one of
   * the following licenses, the combination of the program with the linked
   * library is not considered a "derivative work" of the program:
   *
   *       • Apache License, version 2.0
   *       • Apache Software License, version 1.0
   *       • GNU Lesser General Public License, version 3
   *       • Mozilla Public License, versions 1.0, 1.1 and 2.0
   *       • Common Development and Distribution License (CDDL), version 1.0
   *
   * Therefore the distribution of the program linked with libraries licensed
   * under the aforementioned licenses, is permitted by the copyright holders
   * if the distribution is compliant with both the GNU General Public
   * License version 2 and the aforementioned licenses.
   *
   * 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.
   */
  package org.n52.wps.server.request.strategy;
  
  import java.io.IOException;
  import java.io.InputStream;
  
  import org.apache.http.HttpEntity;
  import org.apache.http.HttpResponse;
  import org.apache.http.client.HttpClient;
  import org.apache.http.client.methods.HttpGet;
  import org.apache.http.client.methods.HttpPost;
  import org.apache.http.entity.StringEntity;
  import org.apache.http.impl.client.DecompressingHttpClient;
  import org.apache.http.impl.client.DefaultHttpClient;
  import org.apache.http.message.BasicHeader;
  import org.n52.wps.server.request.InputHandler;
  
  /**
   * An extension of an Input Stream with HTTP Connection abilities.
   * Uses an {@link InputStream} internally. HTTP connection is established
   * in a lazy fashion, i.e. on first read attempt.
   * 
   * This class shall prevent timeout issues with I/O streaming in the WPS framework.
   * 
   * @deprecated alternative implementation now used, featuring {@link ReferenceInputStream} and
   * corresponding adjustments in {@link InputHandler}
   * 
   * @author Matthias Mueller, TU Dresden
   *
   */
  @Deprecated
  public class LazyHttpInputStream extends InputStream {
  
  	private InputStream is;
  	private boolean initDone = false;
  	
  	// connection parameters
  	final boolean useHttpGet;
  	final String dataURLString;
  	final String body;
  	final String mimeType;
  	
  	/**
  	 * Constructor for HTTP/POST
  	 * 
  	 * @param dataURLString
  	 * @param body
  	 * @param mimeType
  	 */
  	public LazyHttpInputStream (final String dataURLString, final String body, final String mimeType){
  		this.dataURLString = dataURLString;
  		this.body = body;
  		this.mimeType = mimeType;
  		useHttpGet = false;
  	}
  	
  	/**
  	 * Constructor for HTTP/GET
  	 * 
  	 * @param dataURLString
  	 * @param body
  	 * @param mimeType
  	 */
  	public LazyHttpInputStream (final String dataURLString, final String mimeType){
  		this.dataURLString = dataURLString;
  		this.body = null;
  		this.mimeType = mimeType;
  		useHttpGet = true;
  	}
  	
  	/**
  	 * Private init method that makes HTTP connections.
  	 * 
  	 * @throws IOException
  	 */
  	private final void init() throws IOException{
  		if (useHttpGet){
  			is = httpGet(dataURLString, mimeType);
  		} else {
  			is = httpPost(dataURLString, body, mimeType);
  		}
  		
  		initDone = true;
  	}
  
  
  	@Override
  	public int read() throws IOException {
  		if (!initDone){
  			init();
  		}
  
  		return is.read();
  	}
  
  	@Override
  	public int available() throws IOException {
  		if (!initDone){
  			init();
  		}
  		return is.available();
  	}
  
  	@Override
  	public void close() throws IOException {
  		if (!initDone){
  			init();
  		}
  		is.close();
  	}
  
  	@Override
  	public synchronized void mark(int readlimit) {
  		if (!initDone){
  			try {
  				init();
  			} catch (IOException e) {
  				// silent catch
  			}
  		}
  		is.mark(readlimit);
  	}
  
  	@Override
  	public synchronized void reset() throws IOException {
  		if (!initDone){
  			init();
  		}
  		is.reset();
  	}
  
  	@Override
  	public boolean markSupported() {
  		if (!initDone){
  			// silent catch
  		}
  		return is.markSupported();
  	}
  	
  	/**
  	 * Make a GET request using mimeType and href
  	 * 
  	 * TODO: add support for autoretry, proxy
  	 */
  	private static InputStream httpGet(final String dataURLString, final String mimeType) throws IOException {
  		HttpClient backend = new DefaultHttpClient();
  		DecompressingHttpClient httpclient = new DecompressingHttpClient(backend);
  		
  		HttpGet httpget = new HttpGet(dataURLString);
  		
  		if (mimeType != null){
  			httpget.addHeader(new BasicHeader("Content-type", mimeType));
  		}
  		
  		HttpResponse response = httpclient.execute(httpget);
  		HttpEntity entity = response.getEntity();
  		return entity.getContent();
  	}
  	
  	/**
  	 * Make a POST request using mimeType and href
  	 * 
  	 * TODO: add support for autoretry, proxy
  	 */
  	private static InputStream httpPost(final String dataURLString, final String body, final String mimeType) throws IOException {
  		HttpClient backend = new DefaultHttpClient();
  		
  		DecompressingHttpClient httpclient = new DecompressingHttpClient(backend);
  		
  		HttpPost httppost = new HttpPost(dataURLString);
  		
  		if (mimeType != null){
  			httppost.addHeader(new BasicHeader("Content-type", mimeType));
  		}
  		
  		// set body entity
  		HttpEntity postEntity = new StringEntity(body);
  		httppost.setEntity(postEntity);
  		
  		HttpResponse response = httpclient.execute(httppost);
  		HttpEntity resultEntity = response.getEntity();
  		return resultEntity.getContent();
  	}
  
  }
  