LdapUtility.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.transport.ldap;

import java.net.URI;
import java.net.URISyntaxException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

import javax.naming.InvalidNameException;
import javax.naming.ldap.LdapName;

/**
 * Classe utility per ldap
 * 
 * @author Tommaso Burlon (tommaso.burlon@link.it)
 * @author $Author$  
 * @version $Rev$, $Date$
 *
 */
public class LdapUtility {
    
    private LdapUtility() {}
    
    public static LdapName getBaseFromURI(URI uri) throws InvalidNameException {
        String[] paths = uri.getPath().split("/");
        String base = paths.length > 0 ? paths[paths.length - 1] : "";
        return new LdapName(base);
    }
    
    public static String[] getAttributesFromURI(URI uri) {
        String[] params = uri.getQuery().split("\\?");
        for (String param : params)
            if (!param.isEmpty() && param.charAt(0) != '(')
                return param.split(",");
        return new String[0];
    }
    
    public static URI getBaseUrlFromURI(String uri) throws URISyntaxException {
        return getBaseUrlFromURI(new URI(uri));
    }
    public static URI getBaseUrlFromURI(URI uri) throws URISyntaxException {
        String scheme = Objects.requireNonNullElse(uri.getScheme(), "ldap");
        int port = Objects.requireNonNullElse(uri.getPort(), scheme.equals("ldaps") ? 636 : 389);
        return new URI(scheme + "://" + uri.getHost() + ":" + port);
    }
    
    public static LdapFilter getFilterFromURI(URI uri) throws ParseException {
        String[] params = uri.getQuery().split("\\?");
        for (String param : params)
            if (!param.isEmpty() && param.charAt(0) == '(')
                return LdapFilter.parse(param);
        return LdapFilter.isPresent("cn");
    }
    
    public static LdapQuery getQueryFromURI(String uri) throws InvalidNameException, ParseException, URISyntaxException {
        return getQueryFromURI(new URI(uri));
    }
    public static LdapQuery getQueryFromURI(URI uri) throws InvalidNameException, ParseException {
        return new LdapQuery()
                .attributes(LdapUtility.getAttributesFromURI(uri))
                .filter(LdapUtility.getFilterFromURI(uri))
                .base(LdapUtility.getBaseFromURI(uri));
    }
    
    public static URI getURIFromQuery(URI baseUrl, LdapQuery query) throws URISyntaxException {
        StringBuilder url = new StringBuilder(getBaseUrlFromURI(baseUrl).toString());
        if (query.getBase() != null)
            url.append("/").append(URLEncoder.encode(query.getBase().toString(), StandardCharsets.UTF_8));
        if (query.getAttributes() != null && !query.getAttributes().isEmpty()) {
            url.append("?");
            List<String> encodeAttr = new ArrayList<>();
            for (String attr : query.getAttributes())
                encodeAttr.add(URLEncoder.encode(attr, StandardCharsets.UTF_8));
            url.append(String.join(",", encodeAttr));
        }
        if (query.getFilter() != null && !query.getFilter().isAbsoluteTrueFilter())
            url.append("?").append(URLEncoder.encode(query.getFilter().toString(), StandardCharsets.UTF_8));
        return new URI(url.toString());
    }
}