Add an RSS feed tagged to a public profile page (mastodon#10502)

* Add featured tag support to rss feed on public account page

* fix codeing style

app/controllers/accounts_controller.rb

@@ -28,6 +28,7 @@ def show
         @pinned_statuses = cache_collection(@account.pinned_statuses, Status) if show_pinned_statuses?
         @statuses        = filtered_status_page(params)
         @statuses        = cache_collection(@statuses, Status)
+        @rss_url         = rss_url
 
         unless @statuses.empty?
           @older_url = older_url if @statuses.last.id > filtered_statuses.last.id
@@ -38,8 +39,9 @@ def show
       format.rss do
         expires_in 0, public: true
 
-        @statuses = cache_collection(default_statuses.without_reblogs.without_replies.limit(PAGE_SIZE), Status)
-        render xml: RSS::AccountSerializer.render(@account, @statuses)
+        @statuses = filtered_statuses.without_reblogs.without_replies.limit(PAGE_SIZE)
+        @statuses = cache_collection(@statuses, Status)
+        render xml: RSS::AccountSerializer.render(@account, @statuses, params[:tag])
       end
 
       format.json do
@@ -97,6 +99,14 @@ def username_param
     params[:username]
   end
 
+  def rss_url
+    if tag_requested?
+      short_account_tag_url(@account, params[:tag], format: 'rss')
+    else
+      short_account_url(@account, format: 'rss')
+    end
+  end
+
   def older_url
     pagination_url(max_id: @statuses.last.id)
   end
@@ -126,7 +136,7 @@ def replies_requested?
   end
 
   def tag_requested?
-    request.path.ends_with?(Addressable::URI.parse("/tagged/#{params[:tag]}").normalize)
+    request.path.split('.').first.ends_with?(Addressable::URI.parse("/tagged/#{params[:tag]}").normalize)
   end
 
   def filtered_status_page(params)

app/serializers/rss/account_serializer.rb

@@ -5,12 +5,12 @@ class RSS::AccountSerializer
   include StatusesHelper
   include RoutingHelper
 
-  def render(account, statuses)
+  def render(account, statuses, tag)
     builder = RSSBuilder.new
 
     builder.title("#{display_name(account)} (@#{account.local_username_and_domain})")
            .description(account_description(account))
-           .link(ActivityPub::TagManager.instance.url_for(account))
+           .link(tag.present? ? short_account_tag_url(account, tag) : short_account_url(account))
            .logo(full_pack_url('media/images/logo.svg'))
            .accent_color('2b90d9')
 
@@ -33,7 +33,7 @@ def render(account, statuses)
     builder.to_xml
   end
 
-  def self.render(account, statuses)
-    new.render(account, statuses)
+  def self.render(account, statuses, tag)
+    new.render(account, statuses, tag)
   end
 end

app/views/accounts/show.html.haml

@@ -7,7 +7,7 @@
   - if @account.user&.setting_noindex
     %meta{ name: 'robots', content: 'noindex, noarchive' }/
 
-  %link{ rel: 'alternate', type: 'application/rss+xml', href: account_url(@account, format: 'rss') }/
+  %link{ rel: 'alternate', type: 'application/rss+xml', href: @rss_url }/
   %link{ rel: 'alternate', type: 'application/activity+json', href: ActivityPub::TagManager.instance.uri_for(@account) }/
 
   - if @older_url