move is-archived-version into a function instead of middleware

lib/is-archived-version.js

@@ -1,7 +1,7 @@
 const patterns = require('../lib/patterns')
 const { deprecated } = require('../lib/enterprise-server-releases')
 
-module.exports = async (req, res, next) => {
+module.exports = function isArchivedVersion (req) {
   // if this is an assets path, use the referrer
   // if this is a docs path, use the req.path
   const pathToCheck = patterns.assetPaths.test(req.path)
@@ -9,7 +9,9 @@ module.exports = async (req, res, next) => {
     : req.path
 
   // ignore paths that don't have an enterprise version number
-  if (!(patterns.getEnterpriseVersionNumber.test(pathToCheck) || patterns.getEnterpriseServerNumber.test(pathToCheck))) return next()
+  if (!(patterns.getEnterpriseVersionNumber.test(pathToCheck) || patterns.getEnterpriseServerNumber.test(pathToCheck))) {
+    return {}
+  }
 
   // extract enterprise version from path, e.g. 2.16
   const requestedVersion = pathToCheck.includes('enterprise-server@')
@@ -17,11 +19,9 @@ module.exports = async (req, res, next) => {
     : pathToCheck.match(patterns.getEnterpriseVersionNumber)[1]
 
   // bail if the request version is not deprecated
-  if (!deprecated.includes(requestedVersion)) return next()
+  if (!deprecated.includes(requestedVersion)) {
+    return {}
+  }
 
-  // attach convenience props
-  req.isArchivedVersion = true
-  req.requestedVersion = requestedVersion
-
-  return next()
+  return { isArchived: true, requestedVersion }
 }

middleware/archived-enterprise-versions-assets.js

@@ -1,5 +1,6 @@
 const path = require('path')
 const patterns = require('../lib/patterns')
+const isArchivedVersion = require('../lib/is-archived-version')
 const got = require('got')
 
 // This module handles requests for the CSS and JS assets for
@@ -9,8 +10,8 @@ const got = require('got')
 // See also ./archived-enterprise-versions.js for non-CSS/JS paths
 
 module.exports = async (req, res, next) => {
-  if (!req.isArchivedVersion) return next()
-  const requestedVersion = req.requestedVersion
+  const { isArchived, requestedVersion } = isArchivedVersion(req)
+  if (!isArchived) return next()
 
   // Only match asset paths
   if (!patterns.assetPaths.test(req.path)) return next()

middleware/archived-enterprise-versions.js

@@ -3,6 +3,7 @@ const slash = require('slash')
 const { latest, firstVersionDeprecatedOnNewSite, lastVersionWithoutStubbedRedirectFiles } = require('../lib/enterprise-server-releases')
 const patterns = require('../lib/patterns')
 const versionSatisfiesRange = require('../lib/version-satisfies-range')
+const isArchivedVersion = require('../lib/is-archived-version')
 const got = require('got')
 const findPage = require('../lib/find-page')
 
@@ -11,8 +12,8 @@ const findPage = require('../lib/find-page')
 // https://github.com/github/help-docs-archived-enterprise-versions
 
 module.exports = async (req, res, next) => {
-  if (!req.isArchivedVersion) return next()
-  const requestedVersion = req.requestedVersion
+  const { isArchived, requestedVersion } = isArchivedVersion(req)
+  if (!isArchived) return next()
 
   // Skip asset paths
   if (patterns.assetPaths.test(req.path)) return next()

middleware/index.js

@@ -54,7 +54,6 @@ module.exports = function (app) {
 
   // *** Rendering, 2xx responses ***
   // I largely ordered these by use frequency
-  app.use(require('./is-archived-version')) // Must come before archived-enterprise-versions* middleware
   app.use(require('./archived-enterprise-versions-assets')) // Must come before static/assets
   app.use('/dist', express.static('dist'))
   app.use('/assets', express.static('assets'))