Serve 503 when PocketBase is unavailable across all content pages

Elternbeirat.Web/Shared/SourceUnavailable.cs

@@ -0,0 +1,30 @@
+namespace Elternbeirat.Web.Shared;
+
+/// <summary>
+///     Marks the current response as HTTP 503 when the content source is down.
+/// </summary>
+/// <remarks>
+///     Several components handle a <see cref="PocketBase.PocketBaseUnavailableException"/>
+///     the same way: the site works but PocketBase does not, so the response is a
+///     503 and the component renders a "temporarily unavailable" note instead of
+///     empty content that would read as 200 "there is nothing here". This puts the
+///     status-setting in one place so those components do not each repeat it.
+/// </remarks>
+internal static class SourceUnavailable
+{
+    /// <summary>
+    ///     Sets the response status to 503 Service Unavailable, if there is a
+    ///     response to set it on.
+    /// </summary>
+    /// <param name="context">
+    ///     The current HTTP context, or <see langword="null"/> when the component
+    ///     renders outside a request (in which case there is nothing to do).
+    /// </param>
+    public static void SetStatus(HttpContext? context)
+    {
+        if (context is not null)
+        {
+            context.Response.StatusCode = StatusCodes.Status503ServiceUnavailable;
+        }
+    }
+}