refactor(app.js): Extract middleware to module

extract check URi is valid, redirect without trailing slashes

lib/web/middleware/checkURiValid.js

@@ -0,0 +1,14 @@
+'use strict'
+
+const logger = require('../../logger')
+const response = require('../../response')
+
+module.exports = function (req, res, next) {
+  try {
+    decodeURIComponent(req.path)
+  } catch (err) {
+    logger.error(err)
+    return response.errorBadRequest(res)
+  }
+  next()
+}

lib/web/middleware/redirectWithoutTrailingSlashes.js

@@ -0,0 +1,17 @@
+'use strict'
+
+const config = require('../../config')
+
+module.exports = function (req, res, next) {
+  if (req.method === 'GET' && req.path.substr(-1) === '/' && req.path.length > 1) {
+    const queryString = req.url.slice(req.path.length)
+    const urlPath = req.path.slice(0, -1)
+    let serverURL = config.serverurl
+    if (config.urlpath) {
+      serverURL = serverURL.slice(0, -(config.urlpath.length + 1))
+    }
+    res.redirect(301, serverURL + urlPath + queryString)
+  } else {
+    next()
+  }
+}