Move Ci::CronParser to Gitlab::Ci::CronParser

1 files changed, 38 insertions, 0 deletions

diff --git a/lib/gitlab/ci/cron_parser.rb b/lib/gitlab/ci/cron_parser.rb
new file mode 100644
index 00000000000..01f37142510
--- /dev/null
+++ b/lib/gitlab/ci/cron_parser.rb
@@ -0,0 +1,38 @@
+module Gitlab
+  module Ci
+    class CronParser
+      VALID_SYNTAX_SAMPLE_TIME_ZONE = 'UTC'.freeze
+      VALID_SYNTAX_SAMPLE_CRON = '* * * * *'.freeze
+
+      def initialize(cron, cron_time_zone = 'UTC')
+        @cron = cron
+        @cron_time_zone = cron_time_zone
+      end
+
+      def next_time_from(time)
+        cron_line = try_parse_cron(@cron, @cron_time_zone)
+        if cron_line.present?
+          cron_line.next_time(time).in_time_zone(Time.zone)
+        else
+          nil
+        end
+      end
+
+      def validation
+        is_valid_cron = try_parse_cron(@cron, VALID_SYNTAX_SAMPLE_TIME_ZONE).present?
+        is_valid_cron_time_zone = try_parse_cron(VALID_SYNTAX_SAMPLE_CRON, @cron_time_zone).present?
+        return is_valid_cron, is_valid_cron_time_zone
+      end
+
+      private
+
+      def try_parse_cron(cron, cron_time_zone)
+        begin
+          Rufus::Scheduler.parse("#{cron} #{cron_time_zone}")
+        rescue
+          nil
+        end
+      end
+    end
+  end
+end
\ No newline at end of file