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/**
* This is the Socket.IO Router. It routes the Messages between the
* components of the Server. The components are at the moment: pad and timeslider
*/
/*
* 2011 Peter 'Pita' Martischka (Primary Technology Ltd)
*
* Licensed 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.
*/
var ERR = require("async-stacktrace");
var log4js = require('log4js');
var messageLogger = log4js.getLogger("message");
var securityManager = require("../db/SecurityManager");
/**
* Saves all components
* key is the component name
* value is the component module
*/
var components = {};
var socket;
/**
* adds a component
*/
exports.addComponent = function(moduleName, module)
{
//save the component
components[moduleName] = module;
//give the module the socket
module.setSocketIO(socket);
}
/**
* sets the socket.io and adds event functions for routing
*/
exports.setSocketIO = function(_socket)
{
//save this socket internaly
socket = _socket;
socket.sockets.on('connection', function(client)
{
var clientAuthorized = false;
//wrap the original send function to log the messages
client._send = client.send;
client.send = function(message)
{
messageLogger.info("to " + client.id + ": " + stringifyWithoutPassword(message));
client._send(message);
}
//tell all components about this connect
for(var i in components)
{
components[i].handleConnect(client);
}
//try to handle the message of this client
function handleMessage(message)
{
if(message.component && components[message.component])
{
//check if component is registered in the components array
if(components[message.component])
{
messageLogger.info("from " + client.id + ": " + stringifyWithoutPassword(message));
components[message.component].handleMessage(client, message);
}
}
else
{
messageLogger.error("Can't route the message:" + stringifyWithoutPassword(message));
}
}
client.on('message', function(message)
{
if(message.protocolVersion && message.protocolVersion != 2)
{
messageLogger.warn("Protocolversion header is not correct:" + stringifyWithoutPassword(message));
return;
}
//client is authorized, everything ok
if(clientAuthorized)
{
handleMessage(message);
}
//try to authorize the client
else
{
//this message has everything to try an authorization
if(message.padId !== undefined && message.sessionID !== undefined && message.token !== undefined && message.password !== undefined)
{
securityManager.checkAccess (message.padId, message.sessionID, message.token, message.password, function(err, statusObject)
{
ERR(err);
//access was granted, mark the client as authorized and handle the message
if(statusObject.accessStatus == "grant")
{
clientAuthorized = true;
handleMessage(message);
}
//no access, send the client a message that tell him why
else
{
messageLogger.warn("Authentication try failed:" + stringifyWithoutPassword(message));
client.json.send({accessStatus: statusObject.accessStatus});
}
});
}
//drop message
else
{
messageLogger.warn("Dropped message cause of bad permissions:" + stringifyWithoutPassword(message));
}
}
});
client.on('disconnect', function()
{
//tell all components about this disconnect
for(var i in components)
{
components[i].handleDisconnect(client);
}
});
});
}
//returns a stringified representation of a message, removes the password
//this ensures there are no passwords in the log
function stringifyWithoutPassword(message)
{
var newMessage = {};
for(var i in message)
{
if(i == "password" && message[i] != null)
newMessage["password"] = "xxx";
else
newMessage[i]=message[i];
}
return JSON.stringify(newMessage);
}
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