/*
 * 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.parser;

import java.io.IOException;

import at.gv.egovernment.moa.id.ParseException;
import at.gv.egovernment.moa.util.Base64Utils;

/**
 * Parser for a SAML artifact.
 * @author Paul Ivancsics
 * @version $Id$
 */
public class SAMLArtifactParser {
  /** byte array containing the SamlArtifact bytes */
  private byte[] samlArtifactBytes;

  /**
   * Constructor
   * @param samlArtifact as String
   * @throws ParseException on any parsing error
   */
  public SAMLArtifactParser(String samlArtifact) throws ParseException {
    try {
      samlArtifactBytes = Base64Utils.decode(samlArtifact, false);
    }
    catch (IOException ex) {
      throw new ParseException("parser.02", new Object[] {ex.toString()}, ex);
    }
  }
  /**
   * Parses the type code.
   * @return type code
   * @throws ParseException when SAML artifact is invalid
   */
  public byte[] parseTypeCode() throws ParseException {
    try {
      byte[] typeCode = new byte[] {samlArtifactBytes[0], samlArtifactBytes[1]};
      return typeCode;
    }
    catch (Throwable ex) {
      throw new ParseException("parser.02", new Object[] {ex.toString()}, ex);
    }
  }
  /**
   * Parses the assertion handle.
   * @return assertion handle
   * @throws ParseException when SAML artifact is invalid
   */
  public String parseAssertionHandle() throws ParseException {
    try {
      return new String(samlArtifactBytes, 22, 20);
    }
    catch (Throwable ex) {
      throw new ParseException("parser.02", new Object[] {ex.toString()}, ex);
    }
  }

}