Examples of com.metaparadigm.jsonrpc.JSONRPCBridge

com.metaparadigm.jsonrpc.JSONRPCBridge
This class implements a bridge that unmarshalls JSON objects in JSON-RPC request format, invokes a method on the exported object, and then marshalls the resulting Java objects to JSON objects in JSON-RPC result format.
An instance of the JSONRPCBridge object is automatically placed in the HttpSession object registered under the attribute "JSONRPCBridge" by the JSONRPCServlet.
The bridge is implemented as session specific to improve the security of applications by allowing exporting of object methods only to specific HttpSessions.
To use the bridge to allow calling of Java methods you can easily access the HttpSession specific bridge in JSP using the usebean tag. eg.
<jsp:useBean id="JSONRPCBridge" scope="session" class="com.metaparadigm.jsonrpc.JSONRPCBridge" />
Then export the object you wish to call methods on. eg.
JSONRPCBridge.registerObject("test", testObject);
This will make available all methods of the object as test.<methodnames> to JSON-RPC clients. This method should generally be performed after an authentication check to only export specific objects to clients that are authorised to use them.
There exists a global bridge singleton object that will allow exporting objects to all HTTP clients. This can be used for registering factory classes although care must be taken with authentication as these objects will be accessible to all clients.

    // Find the JSONRPCBridge for this session or create one
    // if it doesn't exist
    long startTime = System.currentTimeMillis();
    log.debug("Incoming JSON message");


    JSONRPCBridge jsonBridge = (JSONRPCBridge) getServletContext().getAttribute(JSON_RPC_BRIDGE_ATTRIBUTE);


    // updateUserContext(request);


    // Encode using UTF-8, although We are actually ASCII clean as
    // all unicode data is JSON escaped using backslash u. This is
    // less data efficient for foreign character sets but it is
    // needed to support naughty browsers such as Konqueror and Safari
    // which do not honour the charset set in the response
    response.setContentType("text/plain;charset=utf-8");


    JSONObject jsonReq = null;
    JSONRPCResult jsonRes = null;


    // Decode using the charset in the request if it exists otherwise
    // use UTF-8 as this is what all browser implementations use.
    // The JSON-RPC-Java JavaScript client is ASCII clean so it
    // although here we can correctly handle data from other clients
    // that do not escape non ASCII data
    String charset = request.getCharacterEncoding();
    if (charset == null) {
      charset = "UTF-8";
    }
    BufferedReader in = new BufferedReader(new InputStreamReader(request.getInputStream(), charset));


    // Read the request
    CharArrayWriter data = new CharArrayWriter();
    char[] buf = new char[BUFFER_SIZE];
    int ret;
    while ((ret = in.read(buf, 0, BUFFER_SIZE)) != -1) {
      data.write(buf, 0, ret);
    }
    writeReceive(data.toString());
    try {
      jsonReq = new JSONObject(data.toString());
      // Process the request
      jsonRes = jsonBridge.call(new Object[] { request }, jsonReq);
    } catch (ParseException e) {
      log.error("can't parse call: " + data, e);
      jsonRes = new JSONRPCResult(JSONRPCResult.CODE_ERR_PARSE, null, JSONRPCResult.MSG_ERR_PARSE);
    }

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    log.error("JSON invocation error", error);
  }


  private void initBridge(ServletConfig config, ApplicationContext applicationContext) throws ServletException {
    // Create the JSON RPC Bridge (context-wide object)
    JSONRPCBridge jsonBridge = new JSONRPCBridge(false);
    try {
      // Order is important !!!!
      jsonBridge.registerSerializer(applicationContext.getBean("dojo.server.json.AnnotatedBeanSerializer",
          AnnotatedBeanSerializer.class));
      jsonBridge.registerSerializer(new GeometrySerializer());
      jsonBridge.registerSerializer(new DtoGeometrySerializer());
      jsonBridge.registerSerializer(new BigNumberSerializer());
      jsonBridge.registerSerializer(new ArraySerializer());
      jsonBridge.registerSerializer(new DictionarySerializer());
      jsonBridge.registerSerializer(new MapSerializer());
      jsonBridge.registerSerializer(new SetSerializer());
      jsonBridge.registerSerializer(new ListSerializer());
      jsonBridge.registerSerializer(new DateSerializer());
      jsonBridge.registerSerializer(new StringSerializer());
      jsonBridge.registerSerializer(new NumberSerializer());
      jsonBridge.registerSerializer(new BooleanSerializer());
      jsonBridge.registerSerializer(new PrimitiveSerializer());
      jsonBridge.registerSerializer(new RectangleSerializer());
      jsonBridge.registerSerializer(new ColorSerializer());
      jsonBridge.registerSerializer(new FontSerializer());
      jsonBridge.registerSerializer(new EnumSerializer());
    } catch (Exception e) {
      throw new ServletException("json : could not register all serializers", e);
    }


    // register the controller object
    CommandDispatcher commandDispatcher = applicationContext.getBean("command.CommandDispatcher",
        CommandDispatcher.class);
    if (null == commandDispatcher) {
      throw new ServletException(
          "Cannot find CommandDispatcher, the org.geomajas.internal.global.GeomajasContextListener "
              + "was probably not registered.");
    }
    jsonBridge.registerObject("CommandDispatcher", commandDispatcher);
    jsonBridge.registerCallback(this, HttpServletRequest.class);


    // put in application context
    config.getServletContext().setAttribute(JSON_RPC_BRIDGE_ATTRIBUTE, jsonBridge);
  }

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         * Create a new bridge for every request to aviod all the problems with JSON-RPC-Java storing the bridge in the session
         */
        HttpSession session = request.getSession();
        try {


            JSONRPCBridge jsonrpcBridge = new JSONRPCBridge();
            for (EntryPointContext epc : entryPoints) {
                jsonrpcBridge.registerObject(epc.getName(), epc.getInstance(null));
            }
            session.setAttribute("JSONRPCBridge", jsonrpcBridge);


            super.service(request, response);

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         * Create a new bridge for every request to avoid all the problems with 
         * JSON-RPC-Java storing the bridge in the session
         */
        HttpSession session = request.getSession();


        JSONRPCBridge jsonrpcBridge = new JSONRPCBridge();
        jsonrpcBridge.registerObject("Service", serviceInstance, serviceInterface);
        session.setAttribute("JSONRPCBridge", jsonrpcBridge);
        
        org.json.JSONObject jsonReq = null;
        com.metaparadigm.jsonrpc.JSONRPCResult jsonResp = null;
        try {
            jsonReq = new org.json.JSONObject(requestData);
        } catch (java.text.ParseException e) {
            throw new RuntimeException("Unable to parse request", e);
        }


        String method = jsonReq.getString("method");
        if ((method != null) && (method.indexOf('.') < 0)) {
            jsonReq.putOpt("method", "Service" + "." + method);
        }


        // invoke the request
        jsonResp = jsonrpcBridge.call(new Object[] {request}, jsonReq);


        return jsonResp.toString().getBytes("UTF-8");
    }

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        JSONRPCBridge.getGlobalBridge().registerObject(key, value);
    }


    public void registerObject(HttpSession session, String key, Object value)
    {
        JSONRPCBridge json_bridge = getBridge(session);
        json_bridge.setDebug(DEBUG);
        json_bridge.registerObject(key, value);
    }

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        json_bridge.registerObject(key, value);
    }


    public JSONRPCBridge getBridge(HttpSession session)
    {
        JSONRPCBridge json_bridge = (JSONRPCBridge) session.getAttribute(JSON_BRIDGE_KEY);
        if (json_bridge == null)
        {
            json_bridge = new JSONRPCBridge();
            session.setAttribute(JSON_BRIDGE_KEY, json_bridge);
        }
        return json_bridge;
    }

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     *  @return A JSON RPC Bridge
     */
    // FIXME: Is returning the global bridge a potential security threat?
    private static JSONRPCBridge getBridge( WikiContext context )
    {
        JSONRPCBridge bridge = null;
        HttpServletRequest req = context.getHttpRequest();
        
        if( req != null )
        {
            HttpSession hs = req.getSession();
            
            if( hs != null )
            {
                bridge = (JSONRPCBridge)hs.getAttribute(JSONRPCBRIDGE);
                
                if( bridge == null )
                {
                    bridge = new JSONRPCBridge();
                
                    hs.setAttribute(JSONRPCBRIDGE, bridge);
                }
            }
        }
        
        if( bridge == null) bridge = JSONRPCBridge.getGlobalBridge();
        bridge.setDebug(false);
        
        return bridge;
    }

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     *  
     *  @param session The HttpSession which was created.
     */
    public static void sessionCreated( HttpSession session )
    {
        JSONRPCBridge bridge = (JSONRPCBridge)session.getAttribute(JSONRPCBRIDGE);
        
        if( bridge == null )
        {
            bridge = new JSONRPCBridge();
        
            session.setAttribute( JSONRPCBRIDGE, bridge );
        }


        WikiJSONAccessor acc = new WikiJSONAccessor();
        
        bridge.registerCallback( acc, HttpServletRequest.class );
        
        for( Iterator i = c_globalObjects.values().iterator(); i.hasNext(); )
        {
            CallbackContainer cc = (CallbackContainer) i.next();
       
            bridge.registerObject( cc.m_id, cc.m_object );
        }


    }

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         * Create a new bridge for every request to avoid all the problems with 
         * JSON-RPC-Java storing the bridge in the session
         */
        HttpSession session = request.getSession();


        JSONRPCBridge jsonrpcBridge = new JSONRPCBridge();
        jsonrpcBridge.registerObject("Service", serviceInstance, serviceInterface);
        session.setAttribute("JSONRPCBridge", jsonrpcBridge);
        
        org.json.JSONObject jsonReq = null;
        com.metaparadigm.jsonrpc.JSONRPCResult jsonResp = null;
        try {
            jsonReq = new org.json.JSONObject(requestData);
        } catch (java.text.ParseException e) {
            throw new RuntimeException("Unable to parse request", e);
        }


        String method = jsonReq.getString("method");
        if ((method != null) && (method.indexOf('.') < 0)) {
            jsonReq.putOpt("method", "Service" + "." + method);
        }


        // invoke the request
        jsonResp = jsonrpcBridge.call(new Object[] {request}, jsonReq);


        return jsonResp.toString().getBytes("UTF-8");
    }

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        return new TestSuite(JsonrpcServicelTest.class);
    }


    public void testBridgeAccess()
    {
        JSONRPCBridge bridge = new JSONRPCBridge();
        assertNotNull(bridge);
    }

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