Add support for importing lists (#25203)

app/services/bulk_import_row_service.rb

@@ -7,7 +7,7 @@ class BulkImportRowService
     @type    = row.bulk_import.type.to_sym
 
     case @type
-    when :following, :blocking, :muting
+    when :following, :blocking, :muting, :lists
       target_acct     = @data['acct']
       target_domain   = domain(target_acct)
       @target_account = stoplight_wrap_request(target_domain) { ResolveAccountService.new.call(target_acct, { check_delivery_availability: true }) }
@@ -33,6 +33,12 @@ class BulkImportRowService
       return false unless StatusPolicy.new(@account, @target_status).show?
 
       @account.bookmarks.find_or_create_by!(status: @target_status)
+    when :lists
+      list = @account.owned_lists.find_or_create_by!(title: @data['list_name'])
+
+      FollowService.new.call(@account, @target_account) unless @account.id == @target_account.id
+
+      list.accounts << @target_account
     end
 
     true

app/services/bulk_import_service.rb

@@ -16,6 +16,8 @@ class BulkImportService < BaseService
       import_domain_blocks!
     when :bookmarks
       import_bookmarks!
+    when :lists
+      import_lists!
     end
 
     @import.update!(state: :finished, finished_at: Time.now.utc) if @import.processed_items == @import.total_items
@@ -157,4 +159,24 @@ class BulkImportService < BaseService
       [row.id]
     end
   end
+
+  def import_lists!
+    rows = @import.rows.to_a
+
+    if @import.overwrite?
+      included_lists = rows.map { |row| row.data['list_name'] }.uniq
+
+      @account.owned_lists.where.not(title: included_lists).destroy_all
+
+      # As list membership changes do not retroactively change timeline
+      # contents, simplify things by just clearing everything
+      @account.owned_lists.find_each do |list|
+        list.list_accounts.destroy_all
+      end
+    end
+
+    Import::RowWorker.push_bulk(rows) do |row|
+      [row.id]
+    end
+  end
 end