Remove ttl logic from session id (#7233)

app/lib/session.coffee

@@ -1,29 +1,17 @@
-storage = window.sessionStorage ? window.localStorage
+storage = window.sessionStorage
 stored = JSON.parse storage?.getItem('session_id')
 
 generateSessionID = () ->
   hash = require('hash.js')
   sha2 = hash.sha256()
   id = sha2.update("#{Math.random() * 10000 }#{Date.now()}#{Math.random() * 1000}").digest('hex')
-  ttl = fiveMinutesFromNow()
-  stored = {id, ttl}
+  stored = {id}
   try
     storage.setItem('session_id', JSON.stringify(stored))
   stored
 
 getSessionID = () ->
-  {id, ttl} = JSON.parse(storage.getItem('session_id')) ? generateSessionID()
-  if ttl < Date.now()
-    {id} = generateSessionID()
-  else
-    ttl = fiveMinutesFromNow()
-    try
-      storage.setItem('session_id', JSON.stringify({id, ttl}))
+  {id} = JSON.parse(storage.getItem('session_id')) ? generateSessionID()
   id
 
-fiveMinutesFromNow = () ->
-  d = new Date()
-  d.setMinutes(d.getMinutes() + 5)
-  d
-
 module.exports = {generateSessionID, getSessionID}