/*******************************************************************************
 * <copyright> Copyright 2014 by E-Government Innovation Center EGIZ, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria 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.pdfas.sigs.pkcs7detached;

import iaik.asn1.ObjectID;
import iaik.asn1.structures.AlgorithmID;
import iaik.cms.ContentInfo;
import iaik.cms.SignedData;
import iaik.cms.SignerInfo;
import iaik.x509.X509Certificate;

import java.io.ByteArrayInputStream;
import java.security.SignatureException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.pdfbox.pdmodel.interactive.digitalsignature.PDSignature;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import at.gv.egiz.pdfas.common.exceptions.PdfAsException;
import at.gv.egiz.pdfas.common.exceptions.PdfAsSignatureException;
import at.gv.egiz.pdfas.common.utils.PDFUtils;
import at.gv.egiz.pdfas.lib.api.Configuration;
import at.gv.egiz.pdfas.lib.api.verify.VerifyResult;
import at.gv.egiz.pdfas.lib.impl.verify.FilterEntry;
import at.gv.egiz.pdfas.lib.impl.verify.IVerifier;
import at.gv.egiz.pdfas.lib.impl.verify.IVerifyFilter;
import at.gv.egiz.pdfas.lib.impl.verify.SignatureCheckImpl;
import at.gv.egiz.pdfas.lib.impl.verify.VerifyResultImpl;

public class PKCS7DetachedVerifier implements IVerifyFilter {

	private static final Logger logger = LoggerFactory.getLogger(PKCS7DetachedVerifier.class);
	
	public PKCS7DetachedVerifier() {
	}
	
	public List<VerifyResult> verify(byte[] contentData, byte[] signatureContent, 
			Date verificationTime, int[] byteRange, IVerifier verifier)
			throws PdfAsException {
		
		byte[] data = contentData;
		byte[] signature = signatureContent;
		
		List<VerifyResult> verifieResults = verifier.verify(signature, data, verificationTime);
		for(int i =0; i < verifieResults.size();i++) {
			VerifyResultImpl result = (VerifyResultImpl)verifieResults.get(i);
			result.setSignatureData(PDFUtils.blackOutSignature(data, byteRange));
		}
		
		return verifieResults;
		
		
	}

	public List<FilterEntry> getFiters() {
		List<FilterEntry> result = new ArrayList<FilterEntry>();
		result.add(new FilterEntry(PDSignature.FILTER_ADOBE_PPKLITE, PDSignature.SUBFILTER_ADBE_PKCS7_DETACHED));
		//result.add(new FilterEntry(PDSignature.FILTER_ADOBE_PPKLITE, PDSignature.SUBFILTER_ETSI_CADES_DETACHED));
		return result;
	}

	public void setConfiguration(Configuration config) {
		// not needed
	}

}