From 98e289744a516bf7e1996515da94c5fc4bff9b7a Mon Sep 17 00:00:00 2001
From: Daniel Nitsikopoulos <daniel@dnitza.com>
Date: Sun, 16 Jun 2024 10:14:57 +1000
Subject: [PATCH] Add speculation rules for pre-fetching and rendering

---
 config/app.rb                               |  1 +
 slices/main/templates/layouts/app.html.slim |  3 ++
 slices/main/view.rb                         |  1 -
 slices/main/views/context.rb                | 33 +++++++++++++++++++++
 4 files changed, 37 insertions(+), 1 deletion(-)
 create mode 100644 slices/main/views/context.rb

diff --git a/config/app.rb b/config/app.rb
index 61d66b9..a1ed989 100644
--- a/config/app.rb
+++ b/config/app.rb
@@ -6,6 +6,7 @@ module Adamantium
   class App < Hanami::App
     config.actions.content_security_policy[:script_src] += " 'unsafe-eval' https://gist.github.com"
     config.actions.content_security_policy[:script_src] += " *.dnitza.com"
+    config.actions.content_security_policy[:script_src] += " 'inline-speculation-rules' hash-sha256-GSFnYlZ2/GzNMMMe8WYjAF1Xb+IxEi2PZpSLZO+va38="
     config.actions.content_security_policy[:script_src] += " https://api.mapbox.com/mapbox-gl-js/v2.9.1/mapbox-gl.js"
     config.actions.content_security_policy[:media_src] += " https://dnitza.com"
     config.actions.content_security_policy[:script_src] += " https://unpkg.com/htmx.org@1.9.2/dist/htmx.min.js "
diff --git a/slices/main/templates/layouts/app.html.slim b/slices/main/templates/layouts/app.html.slim
index 304e749..21a5098 100644
--- a/slices/main/templates/layouts/app.html.slim
+++ b/slices/main/templates/layouts/app.html.slim
@@ -38,6 +38,9 @@ html x-data="{darkMode: $persist(false)}" :class="{'dark' : darkMode === true}"
     link rel="stylesheet" href="https://unpkg.com/@highlightjs/cdn-assets@11.8.0/styles/github-dark.min.css"
     script src="https://unpkg.com/@highlightjs/cdn-assets@11.8.0/highlight.min.js" defer=""
 
+    script type="speculationrules"
+      == context.speculation_rules
+
     meta property="og:title" content="#{context.content_for(:title)}"
     meta property="og:type" content="website"
     meta property="og:url" content="#{context.content_for(:url)}"
diff --git a/slices/main/view.rb b/slices/main/view.rb
index a81b570..3d1420b 100644
--- a/slices/main/view.rb
+++ b/slices/main/view.rb
@@ -5,7 +5,6 @@ require "hanami/view"
 
 module Main
   class View < Hanami::View
-    config.default_context = Adamantium::Context.new
     config.layouts_dir = "layouts"
     config.layout = "app"
     config.paths = "slices/main/templates"
diff --git a/slices/main/views/context.rb b/slices/main/views/context.rb
new file mode 100644
index 0000000..dc111f4
--- /dev/null
+++ b/slices/main/views/context.rb
@@ -0,0 +1,33 @@
+module Main
+  module Views
+    class Context < Adamantium::Context
+      include Deps["repos.page_repo"]
+
+      def speculation_rules
+        {"prerender": [
+          {
+            "where": {
+              "and": [
+                {"href_matches": "/*"},
+              ]
+            }
+          }
+        ],
+        "prefetch": [
+          {
+            "urls": ["bookmarks", "posts", "photos", "statuses", "uses"],
+            "referrer_policy": "no-referrer"
+          }
+        ]}.to_json
+      end
+
+      def pages
+        page_repo.for_main_nav
+      end
+
+      def current_path
+        request.fullpath
+      end
+    end
+  end
+end