SubjectAlternativeNames.java

/*
 * GovWay - A customizable API Gateway 
 * https://govway.org
 * 
 * Copyright (c) 2005-2025 Link.it srl (https://link.it). 
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3, as published by
 * the Free Software Foundation.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package org.openspcoop2.utils.certificate;

import java.security.cert.CertificateParsingException;
import java.util.ArrayList;
import java.util.List;

import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.asn1.x509.GeneralName;

/**
 * SubjectAlternativeNames
 *
 * @author Poli Andrea (apoli@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 */
public class SubjectAlternativeNames {

    private List<GeneralName> alternativeNames = new ArrayList<>();
    
    
    public List<GeneralName> getObjectAlternativeNames() {
        return this.alternativeNames;
    }
    public GeneralName getObjectAlternativeName(int index) {
        return this.alternativeNames!=null && (this.alternativeNames.size()>index) ? this.alternativeNames.get(index) : null;
    }
    public List<String> getAlternativeNames() {
        List<String> s = new ArrayList<>();
        if(this.alternativeNames!=null && !this.alternativeNames.isEmpty()) {
            for (GeneralName o : this.alternativeNames) {
                if(o.getName()!=null) {
                    s.add(o.getName().toString());
                }
            }
        }
        return s;
    }
    public String getAlternativeName(int index) {
        if(this.alternativeNames!=null && (this.alternativeNames.size()>index)) {
            return (this.alternativeNames.get(index)!=null && this.alternativeNames.get(index).getName()!=null) ? this.alternativeNames.get(index).getName().toString() : null;
        }
        return null;
    }
    public boolean containsAlternativeName(String name) throws CertificateParsingException {
        return containsAlternativeNameEngine(null, name);
    }
    public boolean containsAlternativeName(int tagNum, String name) throws CertificateParsingException {
        return containsAlternativeNameEngine(tagNum, name);
    }
    private boolean containsAlternativeNameEngine(Integer tagNum, String name) throws CertificateParsingException {
        if(name==null) {
            throw new CertificateParsingException("Param name undefined");
        }
        if(this.alternativeNames!=null && !this.alternativeNames.isEmpty()) {
            for (GeneralName o : this.alternativeNames) {
                if(equalsAlternativeName(tagNum, name, o)) {
                    return true;
                }
            }
        }
        return false;
    }
    private boolean equalsAlternativeName(Integer tagNum, String name, GeneralName o) {
        if(o.getName()!=null && name.equals(o.getName().toString())) {
            if(tagNum==null) {
                return true;
            }
            else {
                if(tagNum.intValue() == o.getTagNo()) {
                    return true;
                }
            }
        }
        return false;
    }
    
    public static SubjectAlternativeNames getSubjectAlternativeNames(byte[]encoded) {
        
        org.bouncycastle.asn1.x509.Certificate c =org.bouncycastle.asn1.x509.Certificate.getInstance(encoded);
        Extensions exts = c.getTBSCertificate().getExtensions();
        if (exts != null){
            org.bouncycastle.asn1.x509.GeneralNames gns = org.bouncycastle.asn1.x509.GeneralNames.fromExtensions(exts, Extension.subjectAlternativeName);
            if(gns!=null) {
                
                SubjectAlternativeNames san = null;
                
                org.bouncycastle.asn1.x509.GeneralName [] names = gns.getNames();
                if(names!=null && names.length>0) {
                    
                    san = new SubjectAlternativeNames();
                    
                    for (GeneralName generalName : names) {
                        san.alternativeNames.add(generalName);
                    }
                }
                
                /**System.out.println("======================");
                System.out.println("GeneralNames '"+gns.toString()+"'");
                if(names!=null && names.length>0) {
                    System.out.println("Len '"+names.length+"'");
                    for (int i = 0; i < names.length; i++) {
                        GeneralName gn = names[i];
                        System.out.println("gn["+i+"]=["+gn.getName()+"]["+gn.getTagNo()+"]");
                    }
                }
                System.out.println("======================");*/
                
                return san;
            }
        }
        return null;
        
    }
}