feat: reject requests from incompatible machines

lib/middlewares/rejectIncompatbleMachines.js

@@ -0,0 +1,24 @@
+const semver = require('semver')
+const version = require('../../package.json').version
+const logger = require('../logger')
+
+const rejectIncompatibleMachines = function (req, res, next) {
+  const machineVersion = req.query.version
+  const deviceId = req.deviceId
+
+  if (!machineVersion) return next()
+
+  const serverMajor = semver.major(version)
+  const machineMajor = semver.major(machineVersion)
+
+  if (serverMajor - machineMajor > 1) {
+    logger.error(`Machine version too old: ${machineVersion} deviceId: ${deviceId}`)
+    return res.status(400).json({
+      error: 'Machine version too old'
+    })
+  }
+
+  next()
+}
+
+module.exports = rejectIncompatibleMachines

lib/routes.js

@@ -22,7 +22,7 @@ const logsRoutes = require('./routes/logsRoutes')
 const pairingRoutes = require('./routes/pairingRoutes')
 const diagnosticsRoutes = require('./routes/diagnosticsRoutes')
 const performanceRoutes = require('./routes/performanceRoutes')
-const pollingRoutes = require('./routes/pollingRoutes')
+const rejectIncompatibleMachines = require('./middlewares/rejectIncompatbleMachines')
 const stateRoutes = require('./routes/stateRoutes')
 const termsAndConditionsRoutes = require('./routes/termsAndConditionsRoutes')
 const { router: txRoutes } = require('./routes/txRoutes')
@@ -81,7 +81,6 @@ const loadRoutes = async () => {
 
   // other app routes
   app.use('/graphql', recordPing)
-  app.use('/poll', pollingRoutes)
   app.use('/terms_conditions', termsAndConditionsRoutes)
   app.use('/state', stateRoutes)
   app.use('/cashbox', cashboxRoutes)
@@ -103,6 +102,9 @@ const loadRoutes = async () => {
 
   app.use('/probe', probeRoutes)
 
+  // Not all requests have the machine version on the url
+  // rejecting poll is enough to render the machine "stuck"
+  app.use(rejectIncompatibleMachines)
   await graphQLServer.start()
   app.use('/graphql',
     express.json(),

lib/routes/pollingRoutes.js

@@ -1,15 +0,0 @@
-const express = require('express')
-const nmd = require('nano-markdown')
-const _ = require('lodash/fp')
-
-const router = express.Router()
-
-const version = require('../../package.json').version
-
-function poll (req, res) {
-  return res.json({ version })
-}
-
-router.get('/', poll)
-
-module.exports = router