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/*

    This file is part of the iText (R) project.
    Copyright (c) 1998-2017 iText Group NV
    Authors: Bruno Lowagie, Paulo Soares, et al.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License version 3
    as published by the Free Software Foundation with the addition of the
    following permission added to Section 15 as permitted in Section 7(a):
    FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
    ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
    OF THIRD PARTY RIGHTS

    This program is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    or FITNESS FOR A PARTICULAR PURPOSE.
    See the GNU Affero General Public License for more details.
    You should have received a copy of the GNU Affero General Public License
    along with this program; if not, see http://www.gnu.org/licenses or write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA, 02110-1301 USA, or download the license from the following URL:
    http://itextpdf.com/terms-of-use/

    The interactive user interfaces in modified source and object code versions
    of this program must display Appropriate Legal Notices, as required under
    Section 5 of the GNU Affero General Public License.

    In accordance with Section 7(b) of the GNU Affero General Public License,
    a covered work must retain the producer line in every PDF that is created
    or manipulated using iText.

    You can be released from the requirements of the license by purchasing
    a commercial license. Buying such a license is mandatory as soon as you
    develop commercial activities involving the iText software without
    disclosing the source code of your own applications.
    These activities include: offering paid services to customers as an ASP,
    serving PDFs on the fly in a web application, shipping iText with a closed
    source product.

    For more information, please contact iText Software Corp. at this
    address: [email protected]
 */
package com.itextpdf.signatures;

import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.PublicKey;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 * Superclass for a series of certificate verifiers that will typically
 * be used in a chain. It wraps another CertificateVerifier
 * that is the next element in the chain of which the verify()
 * method will be called.
 */
public class CertificateVerifier {

    /** The previous CertificateVerifier in the chain of verifiers. */
    protected CertificateVerifier verifier;

    /** Indicates if going online to verify a certificate is allowed. */
    protected boolean onlineCheckingAllowed = true;

    /**
     * Creates the final CertificateVerifier in a chain of verifiers.
     *
     * @param verifier	the previous verifier in the chain
     */
    public CertificateVerifier(CertificateVerifier verifier) {
        this.verifier = verifier;
    }

    /**
     * Decide whether or not online checking is allowed.
     *
     * @param onlineCheckingAllowed a boolean indicating whether the certificate can be verified using online verification results.
     */
    public void setOnlineCheckingAllowed(boolean onlineCheckingAllowed) {
        this.onlineCheckingAllowed = onlineCheckingAllowed;
    }

    /**
     * Checks the validity of the certificate, and calls the next
     * verifier in the chain, if any.
     * @param signCert	                the certificate that needs to be checked
     * @param issuerCert	            its issuer
     * @param signDate		            the date the certificate needs to be valid
     * @return a list of VerificationOK objects. The list will be empty if the certificate couldn't be verified.
     * @throws GeneralSecurityException thrown if the certificate has expired, isn't valid yet, or if an exception has been thrown in {@link java.security.cert.Certificate#verify(PublicKey) Certificate#verify}.
     * @throws IOException              Deprecated
     */
    public List verify(X509Certificate signCert, X509Certificate issuerCert, Date signDate)
            throws GeneralSecurityException, IOException {
        // Check if the certificate is valid on the signDate
        if (signDate != null)
            signCert.checkValidity(signDate);
        // Check if the signature is valid
        if (issuerCert != null) {
            signCert.verify(issuerCert.getPublicKey());
        }
        // Also in case, the certificate is self-signed
        else {
            signCert.verify(signCert.getPublicKey());
        }
        List result = new ArrayList<>();
        if (verifier != null)
            result.addAll(verifier.verify(signCert, issuerCert, signDate));
        return result;
    }
}




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