move routes into modules (readonly, export, import)

I moved the routes for requests that handle readonly, export or import
requests into seperate modules.

node/routes/readonly.js

@@ -0,0 +1,83 @@
+var async = require('async');
+var ERR = require('async-stacktrace');
+
+module.exports = function(app)
+{
+  //TODO put this into module
+  //checks for padAccess
+  function hasPadAccess(req, res, callback)
+  {
+    app.securityManager.checkAccess(req.params.pad, req.cookies.sessionid, req.cookies.token, req.cookies.password, function(err, accessObj)
+    {
+      if(ERR(err, callback)) return;
+
+      //there is access, continue
+      if(accessObj.accessStatus == "grant")
+      {
+        callback();
+      }
+      //no access
+      else
+      {
+        res.send("403 - Can't touch this", 403);
+      }
+    });
+  }
+
+  //serve read only pad
+  app.get('/ro/:id', function(req, res)
+  {
+    var html;
+    var padId;
+    var pad;
+
+    async.series([
+      //translate the read only pad to a padId
+      function(callback)
+      {
+        app.readOnlyManager.getPadId(req.params.id, function(err, _padId)
+        {
+          if(ERR(err, callback)) return;
+
+          padId = _padId;
+
+          //we need that to tell hasPadAcess about the pad
+          req.params.pad = padId;
+
+          callback();
+        });
+      },
+      //render the html document
+      function(callback)
+      {
+        //return if the there is no padId
+        if(padId == null)
+        {
+          callback("notfound");
+          return;
+        }
+
+        hasPadAccess(req, res, function()
+        {
+          //render the html document
+          app.exporthtml.getPadHTMLDocument(padId, null, false, function(err, _html)
+          {
+            if(ERR(err, callback)) return;
+            html = _html;
+            callback();
+          });
+        });
+      }
+    ], function(err)
+    {
+      //throw any unexpected error
+      if(err && err != "notfound")
+        ERR(err);
+
+      if(err == "notfound")
+        res.send('404 - Not Found', 404);
+      else
+        res.send(html);
+    });
+  });
+};