feat: generate manifest.json dynamically (#889)

frontend/public/index.html

@@ -14,7 +14,7 @@
   <link rel="icon" type="image/png" sizes="32x32" href="/[{[ .StaticURL ]}]/img/icons/favicon-32x32.png">
   <link rel="icon" type="image/png" sizes="16x16" href="/[{[ .StaticURL ]}]/img/icons/favicon-16x16.png">
   <!-- Add to home screen for Android and modern mobile browsers -->
-  <link rel="manifest" href="/[{[ .StaticURL ]}]/manifest.json">
+  <link rel="manifest" id="manifestPlaceholder">
   <meta name="theme-color" content="#2979ff">
 
   <!-- Add to home screen for Safari on iOS -->
@@ -27,8 +27,37 @@
   <meta name="msapplication-TileImage" content="/[{[ .StaticURL ]}]/img/icons/msapplication-icon-144x144.png">
   <meta name="msapplication-TileColor" content="#2979ff">
 
-  <!-- Inject Some Variables -->
-  <script>window.FileBrowser = JSON.parse(`[{[ .Json ]}]`)</script>
+  <!-- Inject Some Variables and generate the manifest json -->
+  <script>
+    window.FileBrowser = JSON.parse(`[{[ .Json ]}]`);
+    
+    var fullStaticURL = window.location.origin + "/" + window.FileBrowser.StaticURL; 
+    var dynamicManifest = {
+      "name": window.FileBrowser.Name || 'File Browser',
+      "short_name": window.FileBrowser.Name || 'File Browser',
+      "icons": [
+        {
+          "src": fullStaticURL + "/img/icons/android-chrome-192x192.png",
+          "sizes": "192x192",
+          "type": "image/png"
+        },
+        {
+          "src": fullStaticURL + "/img/icons/android-chrome-512x512.png",
+          "sizes": "512x512",
+          "type": "image/png"
+        }
+      ],
+      "start_url": window.location.origin + window.FileBrowser.BaseURL,
+      "display": "standalone",
+      "background_color": "#ffffff",
+      "theme_color": "#455a64"
+    }
+
+    const stringManifest = JSON.stringify(dynamicManifest);
+    const blob = new Blob([stringManifest], {type: 'application/json'});
+    const manifestURL = URL.createObjectURL(blob);
+    document.querySelector('#manifestPlaceholder').setAttribute('href', manifestURL);
+  </script>
 
   <style>
   #loading {