Add RSS feeds for end-users (#7259)

* Add RSS feed for accounts

* Add RSS feeds for hashtags

* Fix code style issues

* Fix code style issues

2 files changed, 76 insertions, 0 deletions

diff --git a/app/serializers/rss/account_serializer.rb b/app/serializers/rss/account_serializer.rb
new file mode 100644
index 000000000..bde360a41
--- /dev/null
+++ b/app/serializers/rss/account_serializer.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+class RSS::AccountSerializer
+  include ActionView::Helpers::NumberHelper
+  include StreamEntriesHelper
+  include RoutingHelper
+
+  def render(account, statuses)
+    builder = RSSBuilder.new
+
+    builder.title("#{display_name(account)} (@#{account.local_username_and_domain})")
+           .description(account_description(account))
+           .link(TagManager.instance.url_for(account))
+           .logo(full_asset_url(asset_pack_path('logo.svg')))
+           .accent_color('2b90d9')
+
+    builder.image(full_asset_url(account.avatar.url(:original))) if account.avatar?
+    builder.cover(full_asset_url(account.header.url(:original))) if account.header?
+
+    statuses.each do |status|
+      builder.item do |item|
+        item.title(status.title)
+            .link(TagManager.instance.url_for(status))
+            .pub_date(status.created_at)
+            .description(status.spoiler_text.presence || Formatter.instance.format(status).to_str)
+
+        status.media_attachments.each do |media|
+          item.enclosure(full_asset_url(media.file.url(:original, false)), media.file.content_type, length: media.file.size)
+        end
+      end
+    end
+
+    builder.to_xml
+  end
+
+  def self.render(account, statuses)
+    new.render(account, statuses)
+  end
+end
diff --git a/app/serializers/rss/tag_serializer.rb b/app/serializers/rss/tag_serializer.rb
new file mode 100644
index 000000000..7680a8da5
--- /dev/null
+++ b/app/serializers/rss/tag_serializer.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+class RSS::TagSerializer
+  include ActionView::Helpers::NumberHelper
+  include ActionView::Helpers::SanitizeHelper
+  include StreamEntriesHelper
+  include RoutingHelper
+
+  def render(tag, statuses)
+    builder = RSSBuilder.new
+
+    builder.title("##{tag.name}")
+           .description(strip_tags(I18n.t('about.about_hashtag_html', hashtag: tag.name)))
+           .link(tag_url(tag))
+           .logo(full_asset_url(asset_pack_path('logo.svg')))
+           .accent_color('2b90d9')
+
+    statuses.each do |status|
+      builder.item do |item|
+        item.title(status.title)
+            .link(TagManager.instance.url_for(status))
+            .pub_date(status.created_at)
+            .description(status.spoiler_text.presence || Formatter.instance.format(status).to_str)
+
+        status.media_attachments.each do |media|
+          item.enclosure(full_asset_url(media.file.url(:original, false)), media.file.content_type, length: media.file.size)
+        end
+      end
+    end
+
+    builder.to_xml
+  end
+
+  def self.render(tag, statuses)
+    new.render(tag, statuses)
+  end
+end