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Java implementation of the Simple Certificate Enrollment Protocol
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/*
 * Copyright (c) 2009-2010 David Grant
 * Copyright (c) 2010 ThruPoint Ltd
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.jscep.transport;

import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.logging.Logger;

import org.jscep.request.PKCSReq;
import org.jscep.request.Request;
import org.jscep.util.LoggingUtil;


/**
 * Transport representing the HTTP POST method
 * 
 * @author David Grant
 */
public class HttpPostTransport extends Transport {
	private static Logger LOGGER = LoggingUtil.getLogger(HttpPostTransport.class);
	
	HttpPostTransport(URL url) {
		super(url);
	}
	
	@Override
	public  T sendRequest(Request msg) throws IOException, MalformedURLException {
		LOGGER.entering(getClass().getName(), "sendMessage", msg);
		
		if (msg instanceof PKCSReq == false) {
			// Appendix F
			//
			// This is allowed for any SCEP message except GetCACert, 
			// GetNextCACert, or GetCACaps.
			IllegalArgumentException e = new IllegalArgumentException("POST transport may not be used for " + msg.getOperation() + " messages.");
			LOGGER.throwing(getClass().getName(), "sendMessage", e);
			
			throw e;
		}
		
        final URL url = getUrl(msg.getOperation());
        final HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("POST");
        conn.setDoOutput(true);
        
    	final OutputStream stream = new BufferedOutputStream(conn.getOutputStream());
    	msg.write(stream);
        stream.close();

        if (conn.getResponseCode() != HttpURLConnection.HTTP_OK) {
        	IOException ioe = new IOException(conn.getResponseCode() + " " + conn.getResponseMessage());
        	
        	LOGGER.throwing(getClass().getName(), "sendMessage", ioe);
        	throw ioe;
        }
        
        T response  = msg.getContentHandler().getContent(conn.getInputStream(), conn.getContentType());
        
        LOGGER.exiting(getClass().getName(), "sendMessage", response);
        return response;
	}
	
	/**
	 * {@inheritDoc}
	 */
	@Override
	public String toString() {
		return "[POST] " + url;
	}
}