[docs-infra] Automatically hide Black Friday banner (#44630)

docs/src/components/banner/AppFrameBanner.tsx

@@ -5,6 +5,15 @@ import FEATURE_TOGGLE from 'docs/src/featureToggle';
 import PageContext from 'docs/src/modules/components/PageContext';
 import { convertProductIdToName } from 'docs/src/modules/components/AppSearch';
 
+const showSurveyMessage = false;
+
+function isBlackFriday() {
+  const today = Date.now();
+  const start = new Date('2024-11-25').getTime();
+  const end = new Date('2024-12-07T23:59:59Z').getTime();
+  return today > start && today < end;
+}
+
 export default function AppFrameBanner() {
   if (!FEATURE_TOGGLE.enable_docsnav_banner) {
     return null;
@@ -14,11 +23,17 @@ export default function AppFrameBanner() {
   // eslint-disable-next-line react-hooks/rules-of-hooks -- FEATURE_TOGGLE never changes
   const pageContext = React.useContext(PageContext);
   const productName = convertProductIdToName(pageContext) || 'MUI';
-  const surveyMessage = `Influence ${productName}'s 2024 roadmap! Participate in the latest Developer Survey`;
-  const blackFridayMessage = `Black Friday is here! Don't miss out on the best offers of the year.`;
 
-  const showSurveyMessage = false;
-  const message = showSurveyMessage ? surveyMessage : blackFridayMessage;
+  let message = '';
+  let href = '';
+
+  if (showSurveyMessage) {
+    message = `Influence ${productName}'s 2024 roadmap! Participate in the latest Developer Survey`;
+    href = 'https://tally.so/r/3Ex4PN?source=website';
+  } else if (isBlackFriday()) {
+    message = `Black Friday is here! Don't miss out on the best offers of the year.`;
+    href = 'https://mui.com/store/bundles/?deal=black-friday&from=docs';
+  }
 
   if (process.env.NODE_ENV !== 'production') {
     if (message.length > 100) {
@@ -28,18 +43,18 @@ export default function AppFrameBanner() {
     }
   }
 
+  if (message === '' || href === '') {
+    return null;
+  }
+
   return (
     <Link
-      href={
-        showSurveyMessage
-          ? 'https://tally.so/r/3Ex4PN?source=website'
-          : 'https://mui.com/store/bundles/?deal=black-friday&from=docs'
-      }
+      href={href}
       target="_blank"
       variant="caption"
       sx={[
         (theme) => ({
-          padding: theme.spacing('7px', 1.5, '8px', 1.5),
+          padding: theme.spacing('6px', 1.5),
           display: { xs: 'none', md: 'block' },
           fontWeight: 'medium',
           textWrap: 'nowrap',