Allowlist aggregate order columns and template names

Page.aggregate interpolated order_by into SQL unchecked while
already allowlisting order_direction; the column is now normalized
and checked against the sortable columns, falling back to pages.id.
Its values arrive from editor-authored aggregate shortcodes, so
this was editor-gated, but the asymmetry was wrong regardless.

template_name and default_template_name now validate inclusion in
Page.custom_templates -- names render as filesystem paths, so only
names actually present in the template directory are acceptable.
Validated only on change: legacy rows whose template file has since
vanished stay saveable, and valid_template's render-time fallback
to standard_template continues to cover them. Two tests that wrote
fabricated template names through the front door now arrange their
state correctly (update_column for the stale-name fallback test, a
real template for the update-persists test).

2 files changed, 19 insertions, 1 deletions

diff --git a/app/models/node.rb b/app/models/node.rb
index 4f585e1..70ed4da 100644
--- a/app/models/node.rb
+++ b/app/models/node.rb
@@ -22,6 +22,11 @@ class Node < ApplicationRecord
   validates_uniqueness_of :slug, :scope => :parent_id, :unless => -> { parent_id.nil? }
   validates_presence_of   :parent_id,                  :unless => -> { Node.root.nil? }
 
+  validates :default_template_name,
+            :inclusion => { :in => ->(_) { Page.custom_templates } },
+            :allow_nil => true,
+            :if        => :default_template_name_changed?
+
   # Class methods
 
   # Returns a page for a given node. If no revision is supplied, it returns
diff --git a/app/models/page.rb b/app/models/page.rb
index e5a8d9d..be21ff7 100644
--- a/app/models/page.rb
+++ b/app/models/page.rb
@@ -11,6 +11,16 @@ class Page < ApplicationRecord
 
   translates :title, :abstract, :body # Globalize2
 
+  # Template names render as filesystem paths; only names actually
+  # present in the public template directory are acceptable. Validated
+  # only on change so legacy rows whose template file has since
+  # vanished stay saveable -- valid_template already falls back to
+  # standard_template for those at render time.
+  validates :template_name,
+            :inclusion => { :in => ->(_) { Page.custom_templates } },
+            :allow_nil => true,
+            :if        => :template_name_changed?
+
   # Associations
   belongs_to :node, optional: true
   belongs_to :user, optional: true
@@ -77,7 +87,10 @@ class Page < ApplicationRecord
         .paginate(:page => page, :per_page => options[:limit])
     end
 
-    scope.order("#{options[:order_by]} #{direction}")
+    column = options[:order_by].to_s.sub(/\Apages\./, "")
+    column = "id" unless %w[id published_at created_at updated_at].include?(column)
+
+    scope.order("pages.#{column} #{direction}")
       .paginate(:page => page, :per_page => options[:limit])
   end