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

import iaik.utils.Base64InputStream;
import iaik.x509.X509Certificate;
import java.io.ByteArrayInputStream;
import java.io.InputStream;

import org.w3c.dom.Element;

import at.gv.egovernment.moa.id.*;
import at.gv.egovernment.moa.id.auth.data.VerifyXMLSignatureResponse;
import at.gv.egovernment.moa.util.Constants;
import at.gv.egovernment.moa.util.DOMUtils;
import at.gv.egovernment.moa.util.XPathUtils;

/**
 * Parses a <code>&lt;VerifyXMLSignatureResponse&gt;</code> returned by
 * MOA-SPSS.
 * This class implements the Singleton pattern
 * 
 * @author Stefan Knirsch
 * @version $Id$
 */


public class VerifyXMLSignatureResponseParser {
  //
  // XPath namespace prefix shortcuts
  //
  /** Xpath prefix for reaching MOA Namespaces */
  private static final String MOA = Constants.MOA_PREFIX + ":";
  /** Xpath prefix for reaching DSIG Namespaces */
  private static final String DSIG = Constants.DSIG_PREFIX + ":";
  /** Xpath expression to the root element */    
  private static final String ROOT = "/" + MOA + "VerifyXMLSignatureResponse/";
  
    /** Xpath expression to the X509SubjectName element */  
  private static final String DSIG_SUBJECT_NAME_XPATH = 
      ROOT + MOA + "SignerInfo/" + DSIG + "X509Data/" + 
      DSIG + "X509SubjectName";        
  /** Xpath expression to the X509Certificate element */  
  private static final String DSIG_X509_CERTIFICATE_XPATH = 
      ROOT + MOA + "SignerInfo/" + DSIG + "X509Data/" + 
          DSIG + "X509Certificate";        
  /** Xpath expression to the PublicAuthority element */  
  private static final String PUBLIC_AUTHORITY_XPATH =
     ROOT + MOA + "SignerInfo/" + DSIG + "X509Data/" + 
      MOA + "PublicAuthority";        
  /** Xpath expression to the PublicAuthorityCode element */  
  private static final String PUBLIC_AUTHORITY_CODE_XPATH =
     PUBLIC_AUTHORITY_XPATH + "/" + MOA + "Code";        
  /** Xpath expression to the QualifiedCertificate element */  
   private static final String QUALIFIED_CERTIFICATE_XPATH =
     ROOT + MOA + "SignerInfo/" + DSIG + "X509Data/" + 
      MOA + "QualifiedCertificate";        
   
  /** Xpath expression to the SignatureCheckCode element */    
  private static final String SIGNATURE_CHECK_CODE_XPATH = 
   ROOT + MOA + "SignatureCheck/" + MOA + "Code";
  /** Xpath expression to the XMLDSIGManifestCheckCode element */    
  private static final String XMLDSIG_MANIFEST_CHECK_CODE_XPATH = 
   ROOT + MOA + "XMLDSIGManifestCheck/" + MOA + "Code";
  /** Xpath expression to the CertificateCheckCode element */      
  private static final String CERTIFICATE_CHECK_CODE_XPATH = 
   ROOT + MOA + "CertificateCheck/" + MOA + "Code";
  
    
  /** This is the root element of the XML-Document provided by the Security Layer Card*/
  private Element verifyXMLSignatureResponse;

  /**
   * Constructor for VerifyXMLSignatureResponseParser.
   * A DOM-representation of the incoming String will be created
   * @param xmlResponse <code>&lt;InfoboxReadResponse&gt;</code> as String
   * @throws ParseException on any parsing error
   */
  public VerifyXMLSignatureResponseParser(String xmlResponse) throws ParseException{
   try {
  InputStream s = new ByteArrayInputStream(xmlResponse.getBytes("UTF-8"));
  
  verifyXMLSignatureResponse = DOMUtils.parseXmlValidating(s); 
     }
     catch (Throwable t) {
      throw new ParseException("parser.01", new Object[] { t.toString() }, t);
    } 
  }
  
  /**
   * Constructor for VerifyXMLSignatureResponseParser.
   * A DOM-representation of the incoming Inputstream will be created
   * @param xmlResponse <code>&lt;InfoboxReadResponse&gt;</code> as InputStream
   * @throws Exception on any parsing error
   */
  public VerifyXMLSignatureResponseParser(InputStream xmlResponse) throws Exception
  {
    try {
       verifyXMLSignatureResponse = DOMUtils.parseXmlValidating(xmlResponse);                        
    }
     catch (Throwable t) {
      throw new ParseException("parser.01", null, t);
    } 
  } 
  
   /**
   * Constructor for VerifyXMLSignatureResponseParser.
   * The incoming Element will be used for further operations
   * @param xmlResponse <code>&lt;InfoboxReadResponse&gt;</code> as Element
   */
  public VerifyXMLSignatureResponseParser(Element xmlResponse)
  {
      verifyXMLSignatureResponse =xmlResponse;                        
  
  }
  
  /**
   * Parse identity link from <code>&lt;InfoboxReadResponse&gt;</code>
   * @return Identity link
   * @throws ParseException on any parsing error
   */

  public VerifyXMLSignatureResponse parseData() throws ParseException {
    
     VerifyXMLSignatureResponse respData=new VerifyXMLSignatureResponse();
    
    try {
       respData.setXmlDsigSubjectName(XPathUtils.getElementValue(verifyXMLSignatureResponse,DSIG_SUBJECT_NAME_XPATH,""));
       Element e = (Element)XPathUtils.selectSingleNode(verifyXMLSignatureResponse,QUALIFIED_CERTIFICATE_XPATH);
       respData.setQualifiedCertificate(e!=null);
       
       Base64InputStream in = new Base64InputStream(new ByteArrayInputStream(XPathUtils.getElementValue(
         verifyXMLSignatureResponse,DSIG_X509_CERTIFICATE_XPATH,"").getBytes("UTF-8")),true);
        
       respData.setX509certificate(new X509Certificate(in));
			 Element publicAuthority = (Element)XPathUtils.selectSingleNode(verifyXMLSignatureResponse,PUBLIC_AUTHORITY_XPATH);
			 respData.setPublicAuthority(publicAuthority != null);
			 respData.setPublicAuthorityCode(XPathUtils.getElementValue(verifyXMLSignatureResponse,PUBLIC_AUTHORITY_CODE_XPATH,""));
       respData.setSignatureCheckCode(new Integer(XPathUtils.getElementValue(verifyXMLSignatureResponse,SIGNATURE_CHECK_CODE_XPATH,"")).intValue());
 
       String xmlDsigCheckCode = XPathUtils.getElementValue(verifyXMLSignatureResponse,XMLDSIG_MANIFEST_CHECK_CODE_XPATH,null);
     if (xmlDsigCheckCode!=null)
     { 
       respData.setXmlDSIGManigest(true);
       respData.setXmlDSIGManifestCheckCode(new Integer(xmlDsigCheckCode).intValue());
     }
      else
       respData.setXmlDSIGManigest(false);
       respData.setCertificateCheckCode(new Integer(XPathUtils.getElementValue(verifyXMLSignatureResponse,CERTIFICATE_CHECK_CODE_XPATH,"")).intValue());             
   }
     catch (Throwable t) {
      throw new ParseException("parser.01", null, t);
    }        
    return respData;
  }
  
  
}