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

import org.w3c.dom.Element;

import at.gv.egovernment.moa.id.ParseException;
import at.gv.egovernment.moa.id.data.AuthenticationData;
import at.gv.egovernment.moa.util.BoolUtils;
import at.gv.egovernment.moa.util.Constants;
import at.gv.egovernment.moa.util.DOMUtils;
import at.gv.egovernment.moa.util.XPathUtils;

/**
 * Parser for the <code>&lt;saml:Assertion&gt;</code> returned by the
 * <code>GetAuthenticationData</code> web service.
 * @author Paul Ivancsics
 * @version $Id$
 */
public class AuthenticationDataAssertionParser implements Constants {
  
  /** Prefix for SAML-Xpath-expressions */  
  private static String SAML = SAML_PREFIX + ":";
  /** Prefix for PersonData-Xpath-expressions */  
  private static String PR = PD_PREFIX + ":";
  /** Prefix for Attribute MajorVersion in an Xpath-expression */  
  private static String MAJOR_VERSION_XPATH =
    "@MajorVersion";
  /** Prefix for Attribute MinorVersion in an Xpath-expression */      
  private static String MINOR_VERSION_XPATH =
    "@MinorVersion";
  /** Prefix for Attribute AssertionID in an Xpath-expression */      
  private static String ASSERTION_ID_XPATH =
    "@AssertionID";
  /** Prefix for Attribute Issuer in an Xpath-expression */      
  private static String ISSUER_XPATH =
    "@Issuer";
  /** Prefix for Attribute IssueInstant in an Xpath-expression */      
  private static String ISSUE_INSTANT_XPATH =
    "@IssueInstant";
  /** Prefix for Element AttributeStatement in an Xpath-expression */
  private static String ATTRIBUTESTATEMENT_XPATH =
    SAML + "AttributeStatement/";
  /** Prefix for Element NameIdentifier in an Xpath-expression */    
  private static String VPK_XPATH =
    ATTRIBUTESTATEMENT_XPATH +
    SAML + "Subject/" +
    SAML + "NameIdentifier";
  /** Prefix for Element Person in an Xpath-expression */
  private static String PERSONDATA_XPATH =
    ATTRIBUTESTATEMENT_XPATH +
    SAML + "Attribute[@AttributeName=\"PersonData\"]/" +
    SAML + "AttributeValue/" +
    PR + "Person/";
  /** Prefix for Element Value in an Xpath-expression */    
  private static String ZMRZAHL_XPATH =
    PERSONDATA_XPATH +
    PR + "Identification/" +
    PR + "Value";
  /** Prefix for Element GivenName in an Xpath-expression */     
  private static String GIVEN_NAME_XPATH =
    PERSONDATA_XPATH +
    PR + "Name/" +
    PR + "GivenName";
  /** Prefix for Element FamilyName in an Xpath-expression */     
  private static String FAMILY_NAME_XPATH =
    PERSONDATA_XPATH +
    PR + "Name/" +
    PR + "FamilyName";
  /** Prefix for Element DateOfBirth in an Xpath-expression */     
  private static String DATE_OF_BIRTH_XPATH =
    PERSONDATA_XPATH +
    PR + "DateOfBirth";
  /** Prefix for Element AttributeValue in an Xpath-expression */     
  private static String IS_QUALIFIED_CERT_XPATH =
    ATTRIBUTESTATEMENT_XPATH +
    SAML + "Attribute[@AttributeName=\"isQualifiedCertificate\"]/" +
    SAML + "AttributeValue";
  /** Prefix for Element AttributeValue in an Xpath-expression */  
  private static String PUBLIC_AUTHORITY_XPATH =
    ATTRIBUTESTATEMENT_XPATH +
    SAML + "Attribute[@AttributeName=\"isPublicAuthority\"]/" +
    SAML + "AttributeValue";
  /** Element samlAssertion represents the SAML:Assertion */  
  private Element samlAssertion;
  
  /**
   * Constructor
   * @param samlAssertion samlpResponse the <code>&lt;samlp:Response&gt;</code> as a DOM element
   */
  public AuthenticationDataAssertionParser(Element samlAssertion) {
    this.samlAssertion = samlAssertion;
  }

  /**
   * Parses the <code>&lt;saml:Assertion&gt;</code>.
   * @return <code>AuthenticationData</code> object
   * @throws ParseException on any error
   */
  public AuthenticationData parseAuthenticationData() 
    throws ParseException {
      
    try {
      AuthenticationData authData = new AuthenticationData();
      //ÄNDERN: NUR der Identification-Teil
      authData.setSamlAssertion(DOMUtils.serializeNode(samlAssertion));
      authData.setMajorVersion(new Integer(
        XPathUtils.getAttributeValue(samlAssertion, MAJOR_VERSION_XPATH, "-1")).intValue());
      authData.setMinorVersion(new Integer(
        XPathUtils.getAttributeValue(samlAssertion, MINOR_VERSION_XPATH, "-1")).intValue());
      authData.setAssertionID(
        XPathUtils.getAttributeValue(samlAssertion, ASSERTION_ID_XPATH, ""));
      authData.setIssuer(
        XPathUtils.getAttributeValue(samlAssertion, ISSUER_XPATH, ""));
      authData.setIssueInstant(
        XPathUtils.getAttributeValue(samlAssertion, ISSUE_INSTANT_XPATH, ""));
      authData.setVPK(
        XPathUtils.getElementValue(samlAssertion, VPK_XPATH, ""));
      authData.setIdentificationValue(
        XPathUtils.getElementValue(samlAssertion, ZMRZAHL_XPATH, ""));
      authData.setGivenName(
        XPathUtils.getElementValue(samlAssertion, GIVEN_NAME_XPATH, ""));
      authData.setFamilyName(
        XPathUtils.getElementValue(samlAssertion, FAMILY_NAME_XPATH, ""));
      authData.setDateOfBirth(
        XPathUtils.getElementValue(samlAssertion, DATE_OF_BIRTH_XPATH, ""));
      authData.setQualifiedCertificate(BoolUtils.valueOf(
        XPathUtils.getElementValue(samlAssertion, IS_QUALIFIED_CERT_XPATH, "")));
      String publicAuthority =
        XPathUtils.getElementValue(samlAssertion, PUBLIC_AUTHORITY_XPATH, null);
      if (publicAuthority == null) {
        authData.setPublicAuthority(false);
        authData.setPublicAuthorityCode("");
      }
      else {
        authData.setPublicAuthority(true);
        if (! publicAuthority.equalsIgnoreCase("true"))
          authData.setPublicAuthorityCode(publicAuthority);
      }
      return authData;
    }
    catch (Throwable t) {
      throw new ParseException("parser.01", new Object[] { t.toString() }, t);
    }
  }

}