Implemented phase 5 for the POC prototype in the Website service.

Services/Website/Sources/Library/Public/Controllers/RootController.swift

@@ -19,17 +19,14 @@ public struct RootController<Context: RequestContext> {
 
     // MARK: Properties
 
-    /// What a page rendered per request is built from, the same as the cached ones.
-    private let page: @Sendable (Locale, Viewer?) -> IndexPage
-
-    /// The store the signed-in viewer is read from, or `nil` to serve everyone the cached page.
-    private let sessions: SessionStore?
+    /// The landing pages. Whatever changes the catalogue refreshes them through it.
+    public let home: HomePages
 
     /// Negotiates the language the bare route answers in.
     private let negotiate: Negotiate
 
-    /// The landing page, rendered once per supported language and reused for every request.
-    private let responses: LocalizedHTMLCollectionResponse
+    /// The store the signed-in viewer is read from, or `nil` to serve everyone the cached page.
+    private let sessions: SessionStore?
 
     // MARK: Initializers
 
@@ -47,28 +44,14 @@ public struct RootController<Context: RequestContext> {
         listings: HomeListings = .init(),
         sessions: SessionStore? = nil
     ) {
-        let page: @Sendable (Locale, Viewer?) -> IndexPage = {
-            .init(
-                locale: $0,
-                assetVersion: assetVersion,
-                siteOrigin: siteOrigin,
-                analytics: analytics,
-                listings: listings,
-                viewer: $1
-            )
-        }
-
+        self.home = .init(
+            assetVersion: assetVersion,
+            siteOrigin: siteOrigin,
+            analytics: analytics,
+            listings: listings
+        )
         self.negotiate = .init(bundle: .module)
-        self.page = page
         self.sessions = sessions
-        // The bare route negotiates, so the pages declare `Vary: Accept-Language`; the prefixed editions share the cache
-        // and carry it too.
-        self.responses = .init(
-            bundle: .module,
-            variesOnAcceptLanguage: true
-        ) {
-            page($0, nil)
-        }
     }
 
 }
@@ -156,14 +139,19 @@ private extension RootController {
         context: Context
     ) async -> Response {
         guard let viewer = await sessions?.viewer(for: request) else {
-            return responses.response(
-                for: language,
+            return await home.response(
+                in: language,
                 request: request
             )
         }
 
-        return HTMLResponse(additionalHeaders: .perViewer) { [page] in
-            page(.init(identifier: language), viewer)
+        let page = await home.page(
+            in: language,
+            for: viewer
+        )
+
+        return HTMLResponse(additionalHeaders: .perViewer) {
+            page
         }
         .response(from: request, context: context)
     }