#399

backend/app/representations/post_repr.rb

@@ -17,8 +17,8 @@ module PostRepr
 
   module_function
 
-  def base post, current_user = nil
-    json = common(post)
+  def base post, current_user = nil, host: nil
+    json = common(post, host:)
     json['tags'] = tag_json(post)
     json['uploaded_user'] = post.uploaded_user && UserRepr.base(post.uploaded_user)
     json['viewed'] = current_user ? current_user.viewed?(post) : false
@@ -26,31 +26,31 @@ module PostRepr
   end
 
   def detail post, current_user = nil, parent_posts: [], child_posts: [],
-             sibling_posts: { }, related: []
-    base(post, current_user).merge(
-        'parent_posts' => cards(parent_posts),
-        'child_posts' => cards(child_posts),
+             sibling_posts: { }, related: [], host: nil
+    base(post, current_user, host:).merge(
+        'parent_posts' => cards(parent_posts, host:),
+        'child_posts' => cards(child_posts, host:),
         'sibling_posts' => sibling_posts.transform_keys(&:to_s).transform_values { |posts|
-          cards(posts)
+          cards(posts, host:)
         },
-        'related' => cards(related))
+        'related' => cards(related, host:))
   end
 
-  def card post
-    common(post).merge('parent_posts' => [], 'child_posts' => [])
+  def card post, host: nil
+    common(post, host:).merge('parent_posts' => [], 'child_posts' => [])
   end
 
-  def cards posts
-    posts.map { |post| card(post) }
+  def cards posts, host: nil
+    posts.map { |post| card(post, host:) }
   end
 
-  def many posts, current_user = nil
-    posts.map { |p| base(p, current_user) }
+  def many posts, current_user = nil, host: nil
+    posts.map { |p| base(p, current_user, host:) }
   end
 
-  def common post
+  def common post, host: nil
     BASE_FIELDS.to_h { |field| [field.to_s, post.public_send(field)] }
-               .merge('thumbnail' => thumbnail_url(post))
+               .merge('thumbnail' => thumbnail_url(post, host:))
   end
 
   def tag_json post
@@ -65,10 +65,13 @@ module PostRepr
     }
   end
 
-  def thumbnail_url post
+  def thumbnail_url post, host: nil
     return nil unless post.thumbnail.attached?
 
-    Rails.application.routes.url_helpers.rails_blob_url(post.thumbnail, only_path: false)
+    Rails.application.routes.url_helpers.rails_storage_proxy_url(
+        post.thumbnail,
+        only_path: false,
+        host:)
   rescue ActionController::UrlGenerationError, ArgumentError, URI::InvalidURIError => e
     Rails.logger.warn(
         "PostRepr.thumbnail_url failed post_id=#{post.id} " \