Express Route Middleware

route_middle_ware.js

var findComponent = function(service_doc, req) {
  return service_doc.components.filter(function (c) { 
    var c_fixed   = c.name.toLowerCase().replace(/\s*/g, ''),
        req_fixed = req.params.component.toLowerCase();       
        return c_fixed === req_fixed;
   });
};

module.exports = {
  configureInstance: function(service_doc) {
    return function(req, res, next) {
      if (!req.params.component) return next(new Error("We cannot configure an unknown component..."));
      var found = findComponent(service_doc, req);
      if (found.length <= 0) return next(new Error("We cannot configure an unknown component..."));
      req.title = found[0].name;
      next();
    };
  },
  
  previewInstance: function(service_doc) {
    return function(req, res, next) {
      if (!req.params.component) return next(new Error("We cannot preview an unknown component..."));
      var found = findComponent(service_doc, req);
      if (found.length <= 0) return next(new Error("We cannot preview an unknown component..."));
      req.result = found[0].componentImage;
      next();
    };
  }
};