feature: support loading pwa-worker from subdir (#13156)

doc/debian/jitsi-meet/jitsi-meet.example

@@ -157,6 +157,13 @@ server {
         alias /etc/jitsi/meet/jitsi-meet.example.com-config.js;
     }
 
+    # Matches /(TENANT)/pwa-worker.js or /(TENANT)/manifest.json to rewrite to / and look for file
+    location ~ ^/([^/?&:'"]+)/(pwa-worker.js|manifest.json)$ {
+        set $subdomain "$1.";
+        set $subdir "$1/";
+        rewrite ^/([^/?&:'"]+)/(pwa-worker.js|manifest.json)$ /$2;
+    }
+
     # BOSH for subdomains
     location ~ ^/([^/?&:'"]+)/http-bind {
         set $subdomain "$1.";

index.html

@@ -13,10 +13,19 @@
     <link rel="manifest" id="manifest-placeholder">
 
     <script>
+        function contextRoot(pathname) {
+            const contextRootEndIndex = pathname.lastIndexOf('/');
+
+            return (
+                contextRootEndIndex === -1
+                ? '/'
+                : pathname.substring(0, contextRootEndIndex + 1)
+            );
+        }
         window.EXCALIDRAW_ASSET_PATH = 'libs/';
         // Dynamically generate the manifest location URL. It must be served from the document origin, and we may have
         // the base pointing to the CDN. This way we can generate a full URL which will bypass the base.
-        document.querySelector('#manifest-placeholder').setAttribute('href', window.location.origin + '/manifest.json');
+        document.querySelector('#manifest-placeholder').setAttribute('href', window.location.origin + contextRoot(window.location.pathname) + 'manifest.json');
 
         document.addEventListener('DOMContentLoaded', () => {
             if (!JitsiMeetJS.app) {
@@ -40,7 +49,7 @@
 
             if (shouldRegisterWorker) {
                 navigator.serviceWorker
-                    .register(window.location.origin + '/pwa-worker.js')
+                    .register(window.location.origin + contextRoot(window.location.pathname) + '/pwa-worker.js')
                     .then(reg => {
                         console.log('Service worker registered.', reg);
                     })