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    1   package org.apache.turbine.services.jsonrpc;
    2
    3   /*
    4    * Licensed to the Apache Software Foundation (ASF) under one
    5    * or more contributor license agreements.  See the NOTICE file
    6    * distributed with this work for additional information
    7    * regarding copyright ownership.  The ASF licenses this file
    8    * to you under the Apache License, Version 2.0 (the
    9    * "License"); you may not use this file except in compliance
    10   * with the License.  You may obtain a copy of the License at
    11   *
    12   *   http://www.apache.org/licenses/LICENSE-2.0
    13   *
    14   * Unless required by applicable law or agreed to in writing,
    15   * software distributed under the License is distributed on an
    16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    17   * KIND, either express or implied.  See the License for the
    18   * specific language governing permissions and limitations
    19   * under the License.
    20   */
    21
    22  import java.io.CharArrayWriter;
    23
    24  import javax.servlet.http.HttpServletRequest;
    25
    26  import org.apache.commons.logging.Log;
    27  import org.apache.commons.logging.LogFactory;
    28  import org.jabsorb.JSONRPCBridge;
    29  import org.jabsorb.JSONRPCResult;
    30  import org.json.JSONArray;
    31  import org.json.JSONException;
    32  import org.json.JSONObject;
    33
    34  /**
    35   * Process a JSON RPC call
    36   *
    37   * @author <a href="mailto:seade@backstagetech.com.au">Scott Eade</a>
    38   */
    39  public class JSONProcessor
    40  {
    41      /** Log. */
    42      private static Log log = LogFactory.getLog(JSONProcessor.class);
    43
    44      /**
    45       * Process a JSON RPC call
    46       * @param cdata the JSON data
    47       * @param json_bridge the {@link JSONRPCBridge} object
    48       * @param request the request
    49       * @return the return object of the JSON RPC call
    50       */
    51      public static Object processCall(CharArrayWriter cdata, JSONRPCBridge json_bridge, HttpServletRequest request)
    52      {
    53          // Process the request
    54          JSONObject json_req = null;
    55          Object json_res = null;
    56          try
    57          {
    58              json_req = new JSONObject(cdata.toString());
    59              if (log.isDebugEnabled())
    60              {
    61                  String methodName = json_req.getString("method");
    62                  JSONArray arguments = json_req.getJSONArray("params");
    63
    64                  // If this a CallableReference it will have a non-zero objectID
    65                  int object_id = json_req.optInt("objectID");
    66                  StringBuilder sb = new StringBuilder(".doprocessCall(): call ");
    67                  if (object_id != 0)
    68                  {
    69                      sb.append("objectID=").append(object_id).append(" ");
    70                  }
    71                  sb.append(methodName).append("(").append(arguments).append(")");
    72                  log.debug(sb.toString());
    73              }
    74              //json_res = json_bridge.call(new Object[] {request}, object_id, methodName, arguments);
    75              json_res = json_bridge.call(new Object[] {request}, json_req);
    76          }
    77          catch (JSONException e)
    78          {
    79              log.error(".processCall(): can't parse call: " + cdata, e);
    80              json_res = JSONRPCResult.MSG_ERR_PARSE;
    81          }
    82          // Write the response
    83          if (log.isDebugEnabled())
    84          {
    85              log.debug(".processCall():  returns " + json_res.toString());
    86          }
    87          return json_res;
    88      }
    89
    90  }