/*
 * Copyright 2003 Federal Chancellery Austria
 * MOA-SPSS 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.egiz.asic.xmlbind;

import java.io.InputStream;
import java.util.Date;

import org.w3c.dom.Element;

import at.gv.egiz.asic.api.ASiCFormat;
import at.gv.egovernment.moa.spss.MOAApplicationException;
import at.gv.egovernment.moa.spss.api.SPSSFactory;
import at.gv.egovernment.moa.spss.api.xmlbind.RequestParserUtils;
import at.gv.egovernment.moaspss.util.Base64Utils;
import at.gv.egovernment.moaspss.util.Constants;
import at.gv.egovernment.moaspss.util.XPathUtils;

/**
 * A parser to parse <code>VerifyCMSSignatureRequest</code> DOM trees into
 * <code>VerifyCMSSignatureRequest</code> API objects.
 *
 * @author Patrick Peck
 * @version $Id$
 */
public class VerifyASICSignatureRequestParser {

  //
  // XPath expressions for selecting parts of the DOM message
  //
  private static final String MOA = Constants.MOA_PREFIX + ":";
  private static final String DATE_TIME_XPATH = MOA + "DateTime";
  private static final String EXTENDED_VALIDATION_XPATH = MOA + "ExtendedValidation";
  private static final String ASIC_SIGNATURE_XPATH = MOA + "ASICSignature";
  private static final String ASIC_EXTENSION_XPATH = MOA + "ASICExtension";
  private static final String TRUST_PROFILE_ID_XPATH = MOA + "TrustProfileID";

  /** The <code>SPSSFactory</code> for creating new API objects. */
  private final SPSSFactory factory = SPSSFactory.getInstance();

  /**
   * Parse a <code>VerifyCMSSignatureRequest</code> DOM element, as defined by the
   * MOA schema.
   *
   * @param requestElem The <code>VerifyCMSSignatureRequest</code> to parse. The
   *                    request must have been successfully parsed against the
   *                    schema for this method to succeed.
   * @return A <code>VerifyCMSSignatureRequest</code> API objects containing the
   *         data from the DOM element.
   * @throws MOAApplicationException An error occurred parsing the request.
   */
  public VerifyASiCRequest parseASIC(Element requestElem)
      throws MOAApplicationException {
    final Date dateTime =
        RequestParserUtils.parseDateTime(requestElem, DATE_TIME_XPATH);

    final boolean extendedValidation =
        RequestParserUtils.parseExtendedValidation(requestElem, EXTENDED_VALIDATION_XPATH, false);

    final String asicSignatureStr =
        XPathUtils.getElementValue(requestElem, ASIC_SIGNATURE_XPATH, "");

    final String asicExtensionStr =
        XPathUtils.getElementValue(requestElem, ASIC_EXTENSION_XPATH, "");

    final String trustProfileID =
        XPathUtils.getElementValue(requestElem, TRUST_PROFILE_ID_XPATH, null);
    // Logger.info("CMSSignature: " + cmsSignatureStr);
    final InputStream asicSignature =
        Base64Utils.decodeToStream(asicSignatureStr, true);

    ASiCFormat format = null;

    if ("asics".equalsIgnoreCase(asicExtensionStr) || "scs".equalsIgnoreCase(asicExtensionStr)
        || "application/vnd.etsi.asic-s+zip".equalsIgnoreCase(asicExtensionStr)) {
      format = ASiCFormat.ASiCS;
    } else if ("asice".equalsIgnoreCase(asicExtensionStr) || "sce".equalsIgnoreCase(asicExtensionStr)
        || "application/vnd.etsi.asic-e+zip".equalsIgnoreCase(asicExtensionStr)) {
      format = ASiCFormat.ASiCE;
    }

    return new VerifyASiCRequest(format, dateTime, asicSignature, trustProfileID, extendedValidation);
  }

}