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Turbine is a servlet based framework that allows experienced Java developers to quickly build secure web applications. Parts of Turbine can also be used independently of the web portion of Turbine as well. In other words, we strive to make portions of Turbine easily available for use in other applications.

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package org.apache.turbine.services.jsonrpc;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.CharArrayWriter;

import javax.servlet.http.HttpServletRequest;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.jabsorb.JSONRPCBridge;
import org.jabsorb.JSONRPCResult;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

/**
 * Process a JSON RPC call
 *
 * @author Scott Eade
 */
public class JSONProcessor
{
    /** Log. */
    private static Logger log = LogManager.getLogger(JSONProcessor.class);

    /**
     * Process a JSON RPC call
     * @param cdata the JSON data
     * @param json_bridge the {@link JSONRPCBridge} object
     * @param request the request
     * @return the return object of the JSON RPC call
     */
    public static Object processCall(CharArrayWriter cdata, JSONRPCBridge json_bridge, HttpServletRequest request)
    {
        // Process the request
        JSONObject json_req = null;
        Object json_res = null;
        try
        {
            json_req = new JSONObject(cdata.toString());
            if (log.isDebugEnabled())
            {
                String methodName = json_req.getString("method");
                JSONArray arguments = json_req.getJSONArray("params");

                // If this a CallableReference it will have a non-zero objectID
                int object_id = json_req.optInt("objectID");
                StringBuilder sb = new StringBuilder(".doprocessCall(): call ");
                if (object_id != 0)
                {
                    sb.append("objectID=").append(object_id).append(" ");
                }
                sb.append(methodName).append("(").append(arguments).append(")");
                log.debug(sb.toString());
            }
            //json_res = json_bridge.call(new Object[] {request}, object_id, methodName, arguments);
            json_res = json_bridge.call(new Object[] {request}, json_req);
        }
        catch (JSONException e)
        {
            log.error(".processCall(): can't parse call: {}", cdata, e);
            json_res = JSONRPCResult.MSG_ERR_PARSE;
        }
        // Write the response
        log.debug(".processCall():  returns ", json_res::toString);
        return json_res;
    }

}