feat: add hash versioning for client side main.js

Author: YasharF

app.js

@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 const path = require('node:path');
+const crypto = require('node:crypto');
+const fs = require('node:fs');
 const express = require('express');
 const compression = require('compression');
 const session = require('express-session');
@@ -207,6 +209,12 @@ app.use('/js/lib', express.static(path.join(__dirname, 'node_modules/@simpleweba
 app.use('/webfonts', express.static(path.join(__dirname, 'node_modules/@fortawesome/fontawesome-free/webfonts'), { maxAge: 31557600000 }));
 app.use('/image-cache', express.static(path.join(__dirname, 'tmp/image-cache'), { maxAge: 31557600000 }));
 
+app.locals.mainJsHash = crypto
+  .createHash('sha256')
+  .update(fs.readFileSync(path.join(__dirname, 'public', 'js', 'main.js')))
+  .digest('hex')
+  .slice(0, 8);
+
 /**
  * Analytics IDs needed thru layout.pug; set as express local so we don't have to pass them with each render call
  */

views/layout.pug

@@ -27,7 +27,7 @@ html.h-100(lang='en')
 
     script(src='/js/lib/jquery.min.js')
     script(src='/js/lib/bootstrap.min.js')
-    script(src='/js/main.js')
+    script(src='/js/main.js?v=' + mainJsHash)
     script(src='https://cdn.jsdelivr.net/npm/cookieconsent@3/build/cookieconsent.min.js')
 
     script(type='text/javascript').