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PDF Signature Validation

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/*
 * Copyright (c) 2020. Sweden Connect
 *
 * 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.swedenconnect.sigval.pdf.pdfstruct.impl;

import lombok.Setter;
import se.swedenconnect.sigval.pdf.pdfstruct.GeneralSafeObjects;
import se.swedenconnect.sigval.pdf.pdfstruct.PDFSignatureContext;
import se.swedenconnect.sigval.pdf.pdfstruct.PDFSignatureContextFactory;

import java.io.IOException;

/**
 * Default implementation of the {@link PDFSignatureContextFactory} providing a base PDF signature context for
 * signed PDF documents to determine whether updates to a PDF document after it was signed can be considered safe
 * with respect to visual content.
 *
 * @author Martin Lindström ([email protected])
 * @author Stefan Santesson ([email protected])
 */
public class DefaultPDFSignatureContextFactory implements PDFSignatureContextFactory {

  @Setter private boolean strict;

  /** {@inheritDoc} */
  @Override public PDFSignatureContext getPdfSignatureContext(byte[] pdfDocument) throws IOException {
    GeneralSafeObjects safeObjectProvider = strict ? new StrictGeneralSafeObjects() : new DefaultGeneralSafeObjects();
    DefaultPDFSignatureContext pdfSignatureContext = new DefaultPDFSignatureContext(pdfDocument, safeObjectProvider);
    return pdfSignatureContext;
  }
}