send pre-thumbnailed images when type is content-container

app/controllers/blob_entries_controller.rb

@@ -51,6 +51,18 @@ class BlobEntriesController < ApplicationController
         file_ext = "gif"
       end
 
+      # content-container may be pre-thumbnailed, see if the file is on the disk
+      if thumb == "content-container" && file_ext == "jpeg"
+        thumbnail_path =
+          Domain::PostFile::Thumbnail.absolute_file_path(
+            sha256,
+            "content_container",
+            0,
+          )
+        send_file(thumbnail_path, type: "image/jpeg", disposition: "inline")
+        return true
+      end
+
       width, height = thumb_params
       filename = "thumb-#{sha256}-#{thumb}.#{file_ext}"
       cache_key = "vips:#{filename}"

app/models/domain/post_file/thumbnail.rb

@@ -72,6 +72,15 @@ class Domain::PostFile::Thumbnail < ReduxApplicationRecord
     return nil unless (post_file = self.post_file)
     return nil unless (sha256 = post_file.sha256)
     sha256_hex = HexUtil.bin2hex(sha256)
+    self.class.absolute_file_path(sha256_hex, thumb_type, T.must(self.frame))
+  end
+
+  sig do
+    params(sha256_hex: String, thumb_type: String, frame: Integer).returns(
+      T.nilable(String),
+    )
+  end
+  def self.absolute_file_path(sha256_hex, thumb_type, frame)
     [
       THUMB_ROOT_DIR,
       thumb_type.to_s,

app/views/layouts/application.html.erb

@@ -12,7 +12,8 @@
         window.MiniProfiler.patchesApplied = true;
       </script>
     <% end %>
-    <%= favicon_link_tag "refurrer-logo-icon.png" %>
+    <link rel="icon" href="data:,">
+    <%= favicon_link_tag "refurrer-logo-icon.png", type: "image/png" %>
     <%= csrf_meta_tags %>
     <%= csp_meta_tag %>
     <%= javascript_pack_tag "application-bundle" %>