🧱 Mixed page infra

DysonNetwork.Shared/PageData/Startup.cs

@@ -0,0 +1,42 @@
+using System.Text.Json;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Routing;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace DysonNetwork.Shared.PageData;
+
+public static class PageStartup
+{
+    public static WebApplication MapPages(this WebApplication app, string defaultFile)
+    {
+#pragma warning disable ASP0016
+        app.MapFallback(async context =>
+        {
+            var html = await File.ReadAllTextAsync(defaultFile);
+
+            using var scope = app.Services.CreateScope();
+            var providers = scope.ServiceProvider.GetServices<IPageDataProvider>();
+
+            var matches = providers
+                .Where(p => p.CanHandlePath(context.Request.Path))
+                .Select(p => p.GetAppDataAsync(context))
+                .ToList();
+            var results = await Task.WhenAll(matches);
+
+            var appData = new Dictionary<string, object?>();
+            foreach (var result in results)
+            foreach (var (key, value) in result)
+                appData[key] = value;
+
+            var json = JsonSerializer.Serialize(appData);
+            html = html.Replace("%%APP_DATA%%", $"<script>window.__APP_DATA__ = {json};</script>");
+
+            context.Response.ContentType = "text/html";
+            await context.Response.WriteAsync(html);
+        });
+#pragma warning restore ASP0016
+
+        return app;
+    }
+}