/**
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE and NOTICE files at the root of the source
 * tree and available online at
 *
 * http://www.dspace.org/license/
 */
package org.purl.sword.server;

import java.io.IOException;
import java.io.PrintWriter;

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

import org.purl.sword.base.AtomDocumentRequest;
import org.purl.sword.base.AtomDocumentResponse;
import org.purl.sword.base.SWORDAuthenticationException;
import org.purl.sword.base.SWORDErrorException;
import org.purl.sword.base.SWORDException;

/**
 * EntryDocumentServlet
 * 
 * @author Glen Robson
 * @author Stuart Lewis
 */
public class AtomDocumentServlet extends DepositServlet {

    public AtomDocumentServlet()
            throws ServletException
    {
        super();
    }

    /**
	 * Process the get request.
	 */
    @Override
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		try {
			// Create the atom document request object
			AtomDocumentRequest adr = new AtomDocumentRequest();
			
			// Are there any authentication details?
			String usernamePassword = getUsernamePassword(request);
			if ((usernamePassword != null) && (!usernamePassword.equals(""))) {
				int p = usernamePassword.indexOf(':');
				if (p != -1) {
					adr.setUsername(usernamePassword.substring(0, p));
					adr.setPassword(usernamePassword.substring(p + 1));
				}
			} else if (authenticateWithBasic()) {
				String s = "Basic realm=\"SWORD\"";
				response.setHeader("WWW-Authenticate", s);
				response.setStatus(401);
				return;
			}
			
			// Set the IP address
			adr.setIPAddress(request.getRemoteAddr());

			// Set the deposit location
			adr.setLocation(getUrl(request));
			
			// Generate the response
			AtomDocumentResponse dr = myRepository.doAtomDocument(adr);
	
			// Print out the Deposit Response
			response.setStatus(dr.getHttpResponse());
			response.setContentType("application/atom+xml; charset=UTF-8");
			PrintWriter out = response.getWriter();
			out.write(dr.marshall());
			out.flush();
		} catch (SWORDAuthenticationException sae) {
			// Ask for credentials again
			String s = "Basic realm=\"SWORD\"";
			response.setHeader("WWW-Authenticate", s);
			response.setStatus(401);
		} catch (SWORDException se) {
			response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
		} catch (SWORDErrorException see) {
			// Get the details and send the right SWORD error document
			super.makeErrorDocument(see.getErrorURI(), 
		               			   see.getStatus(),
		               			   see.getDescription(),
		                           request,
		                           response);
		}	
	}
}