/*
 * Copyright 2003 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */


package at.gv.egovernment.moa.id.auth.servlet;

import iaik.x509.X509Certificate;

import java.io.IOException;
import java.util.Map;

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

import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.lang.StringEscapeUtils;

import at.gv.egovernment.moa.id.AuthenticationException;
import at.gv.egovernment.moa.id.MOAIDException;
import at.gv.egovernment.moa.id.auth.AuthenticationServer;
import at.gv.egovernment.moa.id.auth.MOAIDAuthConstants;
import at.gv.egovernment.moa.id.auth.WrongParametersException;
import at.gv.egovernment.moa.id.auth.builder.DataURLBuilder;
import at.gv.egovernment.moa.id.auth.data.AuthenticationSession;
import at.gv.egovernment.moa.id.util.ParamValidatorUtils;
import at.gv.egovernment.moa.id.util.ServletUtils;
import at.gv.egovernment.moa.logging.Logger;

/**
 * Servlet requested for getting the foreign eID
 * provided by the security layer implementation.
 * Utilizes the {@link AuthenticationServer}.
 *
 */
public class VerifyCertificateServlet extends AuthServlet {

  /**
	 * 
	 */
	private static final long serialVersionUID = -4110159749768152538L;

/**
   * Constructor for VerifyCertificateServlet.
   */
  public VerifyCertificateServlet() {
    super();
  }

  /**
   * GET requested by security layer implementation to verify
   * that data URL resource is available.
   * @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest, HttpServletResponse)
   */
  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
    throws ServletException, IOException { 
    	
		Logger.debug("GET VerifyCertificateServlet");
		
		resp.setHeader(MOAIDAuthConstants.HEADER_EXPIRES,MOAIDAuthConstants.HEADER_VALUE_EXPIRES);
		resp.setHeader(MOAIDAuthConstants.HEADER_PRAGMA,MOAIDAuthConstants.HEADER_VALUE_PRAGMA);
		resp.setHeader(MOAIDAuthConstants.HEADER_CACHE_CONTROL,MOAIDAuthConstants.HEADER_VALUE_CACHE_CONTROL);
		resp.addHeader(MOAIDAuthConstants.HEADER_CACHE_CONTROL,MOAIDAuthConstants.HEADER_VALUE_CACHE_CONTROL_IE);
  }

  /**
   * Gets the signer certificate from the InfoboxReadRequest and 
   * responds with a new 
   * <code>CreateXMLSignatureRequest</code>.
   * <br>
   * Request parameters:
   * <ul>
   * <li>MOASessionID: ID of associated authentication session</li>
   * <li>XMLResponse: <code>&lt;InfoboxReadResponse&gt;</code></li>
   * </ul>
   * @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest, HttpServletResponse)
   */
  protected void doPost(HttpServletRequest req, HttpServletResponse resp)
    throws ServletException, IOException {

		Logger.debug("POST VerifyCertificateServlet");
		
		resp.setHeader(MOAIDAuthConstants.HEADER_EXPIRES,MOAIDAuthConstants.HEADER_VALUE_EXPIRES);
		resp.setHeader(MOAIDAuthConstants.HEADER_PRAGMA,MOAIDAuthConstants.HEADER_VALUE_PRAGMA);
		resp.setHeader(MOAIDAuthConstants.HEADER_CACHE_CONTROL,MOAIDAuthConstants.HEADER_VALUE_CACHE_CONTROL);
		resp.addHeader(MOAIDAuthConstants.HEADER_CACHE_CONTROL,MOAIDAuthConstants.HEADER_VALUE_CACHE_CONTROL_IE);
		
		Map parameters;
	    try 
	    {
	      parameters = getParameters(req);
	    } catch (FileUploadException e) 
	    {
	      Logger.error("Parsing mulitpart/form-data request parameters failed: " + e.getMessage());
	      throw new IOException(e.getMessage());
	     	}
	    String sessionID = req.getParameter(PARAM_SESSIONID);
	    
	    // escape parameter strings
		sessionID = StringEscapeUtils.escapeHtml(sessionID);
				
	    AuthenticationSession session = null;
	    try {
	       // check parameter
	       if (!ParamValidatorUtils.isValidSessionID(sessionID))
	          throw new WrongParametersException("VerifyCertificate", PARAM_SESSIONID, "auth.12");
	       
	    	session = AuthenticationServer.getSession(sessionID);
	    	
	    	
    		X509Certificate cert = AuthenticationServer.getInstance().getCertificate(sessionID, parameters);
    		if (cert == null) {
    			Logger.error("Certificate could not be read.");
    			throw new AuthenticationException("auth.14", null);    		
    		}
    		
	    	boolean useMandate = session.getUseMandate();
	    	
	    	
	    	if (useMandate) {
	    		Logger.error("Online-Mandate Mode for foreign citizencs not supported.");
    			throw new AuthenticationException("auth.13", null);    	          
	    	}
	    	else {
	    		// Foreign Identities Modus	
		    	
		    	String createXMLSignatureRequest = AuthenticationServer.getInstance().createXMLSignatureRequestForeignID(sessionID, cert);
		      // build dataurl (to the GetForeignIDSerlvet)
		    	String dataurl =
	             new DataURLBuilder().buildDataURL(
	               session.getAuthURL(),
	               REQ_GET_FOREIGN_ID,
	               session.getSessionID());
	       
		    	ServletUtils.writeCreateXMLSignatureRequest(resp, session, createXMLSignatureRequest, AuthenticationServer.REQ_PROCESS_VALIDATOR_INPUT, "GetForeignID", dataurl);
		    	
		    	
		    	Logger.debug("Send CreateXMLSignatureRequest to BKU");
	    	}
	    	
			    		      
	    }
	    catch (MOAIDException ex) {
	      handleError(null, ex, req, resp);
	    } 
  }    
 
     
}