Issue/3 - Introduce cache worker middleware (#4) (#5)

* Introduces validate cache worker middleware. #2

* Version bump. #2

app/middlewares/setup/validateCacheWorker.js

@@ -0,0 +1,33 @@
+import { clearCache } from 'nicholas-router'
+import fetch from 'nicholas-wp'
+
+function check() {
+	new Promise( async ( res, rej ) => {
+		const status = await fetch( { path: '/nicholas/v1/cache-status' } )
+		const cacheStatus = JSON.parse( window.sessionStorage.getItem( 'cacheStatus' ) )
+		let cleared = false
+
+
+		if ( status.post_last_updated !== cacheStatus?.post_last_updated ) {
+			cleared = true
+		} else if ( status.theme_last_updated !== cacheStatus?.theme_last_updated ) {
+			cleared = true
+		}
+
+		if ( true === cleared ) {
+			console.debug( 'Cache was cleared' )
+			clearCache()
+			window.sessionStorage.setItem( 'cacheStatus', JSON.stringify( status ) )
+		} else {
+			console.debug( 'Cache was checked, but did not need cleared' )
+		}
+	} )
+}
+
+export default function ( args, next ) {
+	check()
+	// Check cache every 5 minutes
+	window.setInterval( check, 300000 )
+
+	next()
+}

middlewares.js

@@ -3,12 +3,14 @@ import validateAdminPage from './app/middlewares/route/validateAdminPage'
 import validateCompatibilityMode from './app/middlewares/route/validateCompatibilityMode'
 import primeCache from './app/middlewares/route/primeCache'
 import setPreloadWorker from './app/middlewares/setup/setPreloadWorker'
+import validateCacheWorker from './app/middlewares/setup/validateCacheWorker'
 
 // This should be compiled and exported as a global object.
 export {
 	updateAdminBar,
 	validateAdminPage,
 	validateCompatibilityMode,
 	primeCache,
-	setPreloadWorker
+	setPreloadWorker,
+	validateCacheWorker
 }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nicholas-wp",
-  "version": "1.0.6",
+  "version": "1.0.7",
   "description": "WordPress support for Nicholas nearly headless theme framework",
   "main": "fetch.js",
   "scripts": {