Support private messages

app/services/group_reblog_service.rb

@@ -1,18 +1,71 @@
 # frozen_string_literal: true
 
 class GroupReblogService < BaseService
+  include RoutingHelper
 
   def call(status)
     visibility = status.visibility.to_sym
-    return nil if visibility != :public && visibility != :public_unlisted && visibility != :unlisted
+    return nil if !%i(public public_unlisted unlisted private).include?(visibility)
 
     accounts = status.mentions.map(&:account) | status.active_mentions.map(&:account)
+    transcription = visibility == :private
 
     accounts.each do |account|
       next unless account.local?
       next if account.group_message_following_only && !account.following?(status.account)
+      next unless account.group?
+      next if account.id == status.account_id
 
-      ReblogService.new.call(account, status, { visibility: status.visibility }) if account.group?
+      ReblogService.new.call(account, status, { visibility: status.visibility }) if !transcription
+
+      if transcription
+        username = status.account.local? ? status.account.username : "#{status.account.username}@#{status.account.domain}"
+
+        media_attachments = status.media_attachments.map do |media|
+          url = media.needs_redownload? ? media_proxy_url(media.id, :original) : full_asset_url(media.file.url(:original))
+          MediaAttachment.create(
+            account: account,
+            remote_url: media_url(media),
+            thumbnail_remote_url: media_preview_url(media),
+          ).tap do |attachment|
+            attachment.download_file!
+            attachment.save
+          end
+        end
+
+        PostStatusService.new.call(
+          account,
+          text: "Private message by @#{username}\n\\-\\-\\-\\-\n#{status.text}",
+          thread: status.thread,
+          media_ids: media_attachments.map(&:id),
+          sensitive: status.sensitive,
+          spoiler_text: status.spoiler_text,
+          visibility: status.visibility,
+          language: status.language,
+          poll: status.poll,
+          with_rate_limit: true
+        )
+      end
+    end
+  end
+
+  def media_url(media)
+    if media.not_processed?
+      nil
+    elsif media.needs_redownload?
+      media_proxy_url(media.id, :original)
+    else
+      full_asset_url(media.file.url(:original))
+    end
+  end
+
+  def media_preview_url(media)
+    if media.needs_redownload?
+      media_proxy_url(media.id, :small)
+    elsif media.thumbnail.present?
+      full_asset_url(media.thumbnail.url(:original))
+    elsif media.file.styles.key?(:small)
+      full_asset_url(media.file.url(:small))
     end
   end
 end