middleware.js

var path = require("path");

module.exports = function(middleware) {
  var Middleware = {},
    onesignal = require("./library");

  Middleware.hasConfig = function(req, res, next) {
    if (onesignal.config && onesignal.config.id && onesignal.config.secret)
      next();
    else res.status(404);
  };

  Middleware.hasCode = function(req, res, next) {
    if (req.query && req.query.code) {
      next();
    } else if (
      req.query.hasOwnProperty("error") &&
      req.query.error === "access_denied"
    ) {
      res.redirect("onesignal/settings");
    } else {
      middleware.buildHeader(req, res, function() {
        res.render("500", {
          message: req.query.error
        });
      });
    }
  };

  Middleware.OneSignalSDKWorker = function(req, res, next) {
    res.sendFile("OneSignalSDKWorker.js", {
      root: path.join(
        __dirname,
        "../../build/public/plugins/nodebb-plugin-onesignal/static/lib/"
      )
    });
  };

  Middleware.OneSignalSDKUpdaterWorker = function(req, res, next) {
    res.sendFile("OneSignalSDKUpdaterWorker.js", {
      root: path.join(
        __dirname,
        "../../build/public/plugins/nodebb-plugin-onesignal/static/lib/"
      )
    });
  };

  Middleware.isLoggedIn = function(req, res, next) {
    if (req.user && parseInt(req.user.uid, 10) > 0) next();
    else res.redirect(403);
  };

  Middleware.setupRequired = function(req, res, next) {
    if (!req.user) {
      res.locals.setupRequired = false;
      return next();
    }
    onesignal.isUserAssociated(req.user.uid, function(err, assoc) {
      if (err) {
        return next(err);
      }
      res.locals.setupRequired = !assoc;
      next();
    });
  };

  Middleware.addDevice = function(req, res, next) {
    if (!req.body || !req.body.player_id || !req.user) {
      return res.status(400).json("Invalid request");
    }

    onesignal.savePlayerId(req.user.uid, req.body.player_id, function(err) {
      if (err) {
        return res.status(400).json(err);
      }
      next();
    });
  };

  return Middleware;
};