JSONUtils.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.json;

import java.io.Serializable;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.openspcoop2.utils.SemaphoreLock;
import org.slf4j.Logger;

import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.datatype.joda.JodaModule;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;

/** 
 * JSONUtils
 *
 * @author Poli Andrea (apoli@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 */
public class JSONUtils extends AbstractUtils {
    
    private static JSONUtils jsonUtils = null;
    private static JSONUtils jsonUtilsPretty = null;
    private static synchronized void init(boolean prettyPrint){
        if(prettyPrint) {
            if(JSONUtils.jsonUtilsPretty==null){
                JSONUtils.jsonUtilsPretty = new JSONUtils(true);
            }
        }
        else {
            if(JSONUtils.jsonUtils==null){
                JSONUtils.jsonUtils = new JSONUtils(false);
            }
        }
    }
    public static JSONUtils getInstance(){
        return getInstance(false);
    }
    public static JSONUtils getInstance(boolean prettyPrint){
        if(prettyPrint) {
            if(JSONUtils.jsonUtilsPretty==null){
                // spotbugs warning 'SING_SINGLETON_GETTER_NOT_SYNCHRONIZED'
                synchronized (JSONUtils.class) {
                    JSONUtils.init(true);
                }
            }
            return JSONUtils.jsonUtilsPretty;
        }
        else {
            if(JSONUtils.jsonUtils==null){
                // spotbugs warning 'SING_SINGLETON_GETTER_NOT_SYNCHRONIZED'
                synchronized (JSONUtils.class) {
                    JSONUtils.init(false);
                }
            }
            return JSONUtils.jsonUtils;
        }
    }
    

    private static org.openspcoop2.utils.Semaphore semaphore = new org.openspcoop2.utils.Semaphore("JSONUtils");
    private static ObjectMapper internalMapper;
    private static synchronized void initSyncMapper()  {
        if(internalMapper==null){
            internalMapper = new ObjectMapper();
            internalMapper.setTimeZone(TimeZone.getDefault());
            internalMapper.setSerializationInclusion(Include.NON_NULL);
            internalMapper.enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING);
            internalMapper.configure(com.fasterxml.jackson.databind.SerializationFeature.
                    WRITE_DATES_AS_TIMESTAMPS , false);
            // Since 2.1.4, the field exampleSetFlag appears in json produced with ObjectMapper#writeValue(File, Object) when serializing an object of type OpenApi.
            // "exampleSetFlag" : false
            // Con il codice sottostante, nelle classi Mixin l'attributo 'getExampleSetFlag' viene ignorato
            internalMapper.addMixIn(io.swagger.v3.oas.models.media.Schema.class, io.swagger.v3.core.jackson.mixin.SchemaMixin.class);
            internalMapper.addMixIn(io.swagger.v3.oas.models.media.MediaType.class, io.swagger.v3.core.jackson.mixin.MediaTypeMixin.class);
        }
    }
    private static void initMapper()  {
        SemaphoreLock lock = semaphore.acquireThrowRuntime("initMapper");
        try {
            if(internalMapper==null){
                initSyncMapper();
            }
        }finally {
            semaphore.release(lock, "initMapper");
        }
    }
    public static void setMapperTimeZone(TimeZone timeZone) {
        if(internalMapper==null){
            initMapper();
        }
        SemaphoreLock lock = semaphore.acquireThrowRuntime("setMapperTimeZone");
        try {
            internalMapper.setTimeZone(timeZone);
        }finally {
            semaphore.release(lock, "setMapperTimeZone");
        }
    }
    public static void registerJodaModule() {
        if(internalMapper==null){
            initMapper();
        }
        SemaphoreLock lock = semaphore.acquireThrowRuntime("registerJodaModule");
        try {
            internalMapper.registerModule(new JodaModule());
        }finally {
            semaphore.release(lock, "registerJodaModule");
        }
    }
    public static void registerJavaTimeModule() {
        if(internalMapper==null){
            initMapper();
        }
        SemaphoreLock lock = semaphore.acquireThrowRuntime("registerJavaTimeModule");
        try {
            internalMapper.registerModule(new JavaTimeModule());
        }finally {
            semaphore.release(lock, "registerJavaTimeModule");
        }
    }
    
    public static ObjectMapper getObjectMapper() {
        if(internalMapper==null){
            initMapper();
        }
        return internalMapper;
    }
    
    private static ObjectWriter writer;
    private static synchronized void initWriter()  {
        if(internalMapper==null){
            initMapper();
        }
        if(writer==null){
            writer = internalMapper.writer();
        }
    }
    public static ObjectWriter getObjectWriter() {
        if(writer==null){
            initWriter();
        }
        return writer;
    }
    
    private static ObjectWriter writerPrettyPrint;
    private static synchronized void initWriterPrettyPrint()  {
        if(internalMapper==null){
            initMapper();
        }
        if(writerPrettyPrint==null){
            writerPrettyPrint = internalMapper.writer().withDefaultPrettyPrinter();
        }
    }
    public static ObjectWriter getObjectWriterPrettyPrint() {
        if(writerPrettyPrint==null){
            initWriterPrettyPrint();
        }
        return writerPrettyPrint;
    }
    
    
    
    private JSONUtils(boolean prettyPrint) {
        super(prettyPrint);
    }
    
    @Override
    protected void _initMapper() {
        initMapper();
    }
    @Override
    protected void _initWriter(boolean prettyPrint) {
        if(prettyPrint) { 
            initWriterPrettyPrint();
        }
        else {
            initWriter();
        }
    }
    
    @Override
    protected ObjectMapper _getObjectMapper() {
        return getObjectMapper();
    }
    @Override
    protected ObjectWriter _getObjectWriter(boolean prettyPrint) {
        if(prettyPrint) { 
            return getObjectWriterPrettyPrint();
        }
        else {
            return getObjectWriter();
        }
    }
    
    
    // IS
    
    public boolean isJson(byte[]jsonBytes){
        return this.isValid(jsonBytes);
    }
    
    public boolean isJson(String jsonString){
        return this.isValid(jsonString);
    }
    
    
    /** UTILS per tipi vuoi schema: {} */
    
    // Fix: 1620
    public static boolean containsEmptySchema(String json) {
        String pattern = "(?m)\"schema\"\\s*:\\s*\\{\\s*\\}";
        try {
            Pattern p = Pattern.compile(pattern);
            Matcher matcher = p.matcher(json);
            return matcher.find();
        }catch(Exception e) {
            return false;
        }
    }
    public static String resolveEmptySchema(String json) {
        return json.replaceAll("(?m)\"schema\"\\s*:\\s*\\{\\s*\\}", "\"schema\": {\n  \"type\": \"string\"\n}");
    }
    
    
    // CONVERT TO MAP 
    
    public Map<String, Serializable> convertToMap(Logger log, String source, String raw) {
        return this.convertToMap(log, source, raw, null);
    }
    public Map<String, Serializable> convertToMap(Logger log, String source, String raw, List<String> claimsToConvert) {
        if(this.isJson(raw)) {
            return super.convertToMapEngine(log, source, raw, claimsToConvert);
        }
        else {
            return new HashMap<>(); // empty return
        }   
    }
    
    public Map<String, Serializable> convertToMap(Logger log, String source, byte[]raw) {
        return this.convertToMap(log, source, raw, null);
    }
    public Map<String, Serializable> convertToMap(Logger log, String source, byte[]raw, List<String> claimsToConvert) {
        if(this.isJson(raw)) {
            return super.convertToMapEngine(log, source, raw, claimsToConvert);
        }
        else {
            return new HashMap<>(); // empty return
        }   
    }
    
}