Rename "roles" to "units". Put units in their own folders.

lib/units/websocket/middleware/auth.js

@@ -0,0 +1,22 @@
+var dbapi = require('../../../db/api')
+
+module.exports = function(socket, next) {
+  var req = socket.request
+    , token = req.session.jwt
+  if (token) {
+    return dbapi.loadUser(token.email)
+      .then(function(user) {
+        if (user) {
+          req.user = user
+          next()
+        }
+        else {
+          next(new Error('Invalid user'))
+        }
+      })
+      .catch(next)
+  }
+  else {
+    next(new Error('Missing authorization token'))
+  }
+}