Use constants instead of number literals for http status codes

lib/api/notifications-api.js

@@ -1,15 +1,17 @@
 'use strict';
 
+var consts = require('../constants');
+
 function configure (app, wares, ctx) {
   var express = require('express')
     , api = express.Router( )
     ;
 
   api.post('/notifications/pushovercallback', function (req, res) {
     if (ctx.pushnotify.pushoverAck(req.body)) {
-      res.sendStatus(200);
+      res.sendStatus(consts.HTTP_OK);
     } else {
-      res.sendStatus(500);
+      res.sendStatus(consts.HTTP_INTERNAL_ERROR);
     }
   });
 
@@ -21,7 +23,7 @@ function configure (app, wares, ctx) {
       var time = req.query.time && Number(req.query.time);
       console.info('got api ack, level: ', level, ', time: ', time, ', query: ', req.query);
       ctx.notifications.ack(level, group, time, true);
-      res.sendStatus(200);
+      res.sendStatus(consts.HTTP_OK);
     });
   }
 

lib/api/notifications-v2.js

@@ -1,5 +1,7 @@
 'use strict';
 
+var consts = require('../constants');
+
 function configure (app, ctx) {
   var express = require('express')
     , api = express.Router( )
@@ -8,10 +10,10 @@ function configure (app, ctx) {
   api.post('/loop', ctx.authorization.isPermitted('notifications:loop:push'), function (req, res) {
     ctx.loop.sendNotification(req.body, req.connection.remoteAddress, function (error) {
       if (error) {
-        res.status(500).send(error)
+        res.status(consts.HTTP_INTERNAL_ERROR).send(error)
         console.log("error sending notification to Loop: ", error);
       } else {
-        res.sendStatus(200);
+        res.sendStatus(consts.HTTP_OK);
       }
     });
   });

lib/api3/index.js

@@ -39,8 +39,8 @@ function configure (env, ctx) {
       limit: 1048576 * 50
     }), function errorHandler (err, req, res, next) {
       console.error(err);
-      res.status(500).json({
-        status: 500,
+      res.status(apiConst.HTTP.INTERNAL_ERROR).json({
+        status: apiConst.HTTP.INTERNAL_ERROR,
         message: apiConst.MSG.HTTP_500_INTERNAL_ERROR
       });
       if (next) { // we need 4th parameter next to behave like error handler, but we have to use it to prevent "unused variable" message
@@ -81,7 +81,7 @@ function configure (env, ctx) {
           const opCtx = {app, ctx, env, req, res};
           opCtx.auth = await security.authenticate(opCtx);
           await security.demandPermission(opCtx, 'api:entries:read');
-          res.status(200).end();
+          res.status(apiConst.HTTP.OK).end();
         } catch (error) {
           console.error(error);
         }