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