Hey there! Let's tackle your question about automating one-time site notices for classic Google Sites:

1. Is there a Google API for this? #

Yes, but it's key to clarify which version of Google Sites you're working with first. For the classic Google Sites (the one where you access settings via {Google_Classic_Site_Url}/system/app/pages/admin/settings), Google offers the Google Sites Data API which lets you programmatically modify site settings—including adding that one-time site notice.

A quick heads-up: this API is officially deprecated, meaning it won't get new features or updates, but existing implementations will still work for now. If you were dealing with the newer Google Sites (launched post-2016), the current Google Sites API doesn't have a direct endpoint for setting site notices, so your use case is only feasible with the classic version.

2. Can you build this with C# or Google Apps Script? #

Absolutely, both are supported:

C# #

You can use Google's official .NET client library for the Sites API. Here's a high-level breakdown of how to get started:

• Head to the Google Cloud Console, create a project, enable the Google Sites Data API, and generate OAuth 2.0 credentials (either a service account or client ID for desktop/web apps).
• Install the Google.Apis.Sites.v3 NuGet package in your C# project.
• Initialize the Sites service with your credentials, then call the API methods to update the site's notification settings (look for fields related to siteNotification in the site resource schema).

Google Apps Script #

This is actually the simpler option for classic Sites! Google Apps Script has a built-in SitesApp service made specifically for classic Google Sites, and it includes a method to set site notices directly. Here's a quick example script:

function addOneTimeSiteNotice() {
  // Replace with your classic site's URL
  const targetSite = SitesApp.getSiteByUrl("https://your-classic-site-url-here");
  // The second parameter "true" makes the notice dismissible (one-time)
  targetSite.setNotification("Your one-time site notice text goes here!", true);
}

Just run this script from the Apps Script editor (make sure you have admin access to the site), and it'll set up that dismissible notice automatically.

3. Quick reminders #

• Double-check you're working with a classic Google Site—SitesApp and the old Sites Data API don't work with the newer version.
• Since the Sites Data API is deprecated, make sure to test your C# implementation thoroughly, and keep an eye out for any future changes to Google's API support.
• No matter which language you use, you'll need admin permissions for the target site to modify its settings.

内容的提问来源于stack exchange，提问作者Pravin Durgam