se.idsec.sigval.xml.utils.XMLSigUtils Maven / Gradle / Ivy

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/*
 * Copyright (c) 2020. IDsec Solutions AB
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package se.idsec.sigval.xml.utils;

import lombok.extern.slf4j.Slf4j;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import java.util.ArrayList;
import java.util.List;

/**
 * Utility class for common functions related to XML signature processing
 *
 * @author Martin Lindström ([email protected])
 * @author Stefan Santesson ([email protected])
 */
@Slf4j
public class XMLSigUtils {

  /**
   * Get the signature elements of an XML document
   * @param document XML document
   * @return signature elements
   */
  public static List getSignatures(Document document) {
    NodeList signatureElements = document.getElementsByTagNameNS(javax.xml.crypto.dsig.XMLSignature.XMLNS, "Signature");
    if (signatureElements.getLength() == 0) {
      log.debug("No signatures found");
      // We return an empty list of signature results as it is not considered an exception to validate an unsigned document
      return new ArrayList<>();
    }
    List signatures = new ArrayList<>();
    for (int i = 0; i < signatureElements.getLength(); i++) {
      signatures.add((Element) signatureElements.item(i));
    }
    return signatures;
  }

}