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/**
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* '$RCSfile$'
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* Purpose: Used for Java applet/application communication
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* with servlet. Based on code given in the book
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* "Java Servlet Programming" by Hunter & crawford
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Dan Higgins modified for metacat by Chad Berkley
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* Release: @release@
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*
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* '$Author: tao $'
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* '$Date: 2002-05-14 18:23:18 -0700 (Tue, 14 May 2002) $'
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* '$Revision: 1083 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat;
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import java.io.*;
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import java.net.*;
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import java.util.*;
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/**
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* Send a message to an HTTP server using either a GET or POST operation
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*/
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public class HttpMessage {
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public String contype;
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URL servlet = null;
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String argString = null;
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static String cookie = null;
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public HttpMessage(URL servlet) {
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this.servlet = servlet;
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}
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/**
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* return the cookie that this message object contains
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*/
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public static String getCookie()
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{
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return cookie;
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}
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/**
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* Performs a GET request to the previously given servlet
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* with no query string
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*/
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public InputStream sendGetMessage() throws IOException {
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return sendGetMessage(null);
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}
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/**
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* Performs a GET request to the previously given servlet
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*Builds a query string from the supplied Properties list.
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*/
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public InputStream sendGetMessage(Properties args) throws IOException {
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argString = ""; //default
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if (args != null) {
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argString = "?" + toEncodedString(args);
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}
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URL url = new URL(servlet.toExternalForm() + argString);
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// turn off caching
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URLConnection con = url.openConnection();
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con.setUseCaches(false);
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contype = con.getContentType();
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return con.getInputStream();
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}
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/**
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* Performs a POST request to the previously given servlet
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* with no query string
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*/
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public InputStream sendPostMessage() throws IOException {
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return sendPostMessage(null);
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}
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/**
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* Builds post data from the supplied properties list
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*/
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public InputStream sendPostMessage(Properties args) throws IOException {
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argString = ""; //default
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if (args != null) {
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argString = toEncodedString(args);
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}
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URLConnection con = servlet.openConnection();
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if (cookie!=null) {
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int k = cookie.indexOf(";");
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if (k>0) {
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cookie = cookie.substring(0, k);
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}
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//System.out.println("Cookie = " + cookie);
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con.setRequestProperty("Cookie", cookie);
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con.setRequestProperty("User-Agent", "MORPHO"); // add 10/26/00 by DFH so Metacat can determine where request come from
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}
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//prepare for both input and output
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con.setDoInput(true);
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con.setDoOutput(true);
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//turn off caching
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con.setUseCaches(false);
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//work around a Netscape bug
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//con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
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//Write the arguments as post data
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DataOutputStream out = new DataOutputStream(con.getOutputStream());
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out.writeBytes(argString);
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out.flush();
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contype = con.getContentType();
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String temp = con.getHeaderField("Set-Cookie");
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if (temp!=null) {
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cookie = temp;
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}
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//System.out.println(cookie);
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out.close();
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return con.getInputStream();
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}
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/**
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* Returns the urls argument strings
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*/
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public String getArgString() {
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String argString1 = argString;
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if (!argString1.startsWith("?")) {
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argString1 = "?"+argString1;}
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return argString1;
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}
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/**
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* Converts a Properties list to a URL-encoded query string
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*/
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private String toEncodedString(Properties args) {
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StringBuffer buf = new StringBuffer();
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Enumeration names = args.propertyNames();
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while (names.hasMoreElements()) {
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String name = (String)names.nextElement();
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String value = args.getProperty(name);
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buf.append(URLEncoder.encode(name) + "=" + URLEncoder.encode(value));
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if (names.hasMoreElements()) buf.append("&");
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}
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return buf.toString();
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}
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/**
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* return the cookie that this message object contains
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*/
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public static void setCookie(String newCookie)
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{
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cookie = newCookie;
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}
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}
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