fix: naming and redundancy issues

lib/new-admin/middlewares/session.js

@@ -0,0 +1,40 @@
+const fs = require('fs')
+const express = require('express')
+const router = express.Router()
+const hkdf = require('futoin-hkdf')
+const session = require('express-session')
+const pgSession = require('connect-pg-simple')(session)
+const mnemonicHelpers = require('../../mnemonic-helpers')
+const db = require('../../db')
+const options = require('../../options')
+
+const getSecret = () => {
+  const mnemonic = fs.readFileSync(options.mnemonicPath, 'utf8')
+  return hkdf(
+    mnemonicHelpers.toEntropyBuffer(mnemonic),
+    16,
+    { salt: 'lamassu-server-salt', info: 'operator-id' }
+  ).toString('hex')
+}
+
+const hostname = options.hostname
+
+router.use('*', session({
+  store: new pgSession({
+    pgPromise: db,
+    tableName: 'user_sessions'
+  }),
+  name: 'lid',
+  secret: getSecret(),
+  resave: false,
+  saveUninitialized: false,
+  cookie: {
+    httpOnly: true,
+    secure: true,
+    domain: hostname,
+    sameSite: true,
+    maxAge: 60 * 10 * 1000 // 10 minutes
+  }
+}))
+
+module.exports = router