Extract FeatureFlagUserXidsValidator class

Remove duplicate logic from feature flag Strategy and UserList

ee/app/models/operations/feature_flags/strategy.rb

@@ -51,7 +51,7 @@ module Operations
         when STRATEGY_GRADUALROLLOUTUSERID
           gradual_rollout_user_id_parameters_validation
         when STRATEGY_USERWITHID
-          user_with_id_parameters_validation
+          FeatureFlagUserXidsValidator.validate_user_xids(self, :parameters, parameters['userIds'], 'userIds')
         end
       end
 
@@ -68,24 +68,6 @@ module Operations
         end
       end
 
-      def user_with_id_parameters_validation
-        user_ids = parameters['userIds']
-        unless user_ids.is_a?(String) && !user_ids.match(/[\n\r\t]|,,/) && valid_ids?(user_ids.split(","))
-          parameters_error("userIds must be a string of unique comma separated values each #{USERID_MAX_LENGTH} characters or less")
-        end
-      end
-
-      def valid_ids?(user_ids)
-        user_ids.uniq.length == user_ids.length &&
-          user_ids.all? { |id| valid_id?(id) }
-      end
-
-      def valid_id?(user_id)
-        user_id.present? &&
-          user_id.strip == user_id &&
-          user_id.length <= USERID_MAX_LENGTH
-      end
-
       def parameters_error(message)
         errors.add(:parameters, message)
         false

ee/app/models/operations/feature_flags/user_list.rb

@@ -5,8 +5,6 @@ module Operations
     class UserList < ApplicationRecord
       include AtomicInternalId
 
-      USERXID_MAX_LENGTH = 256
-
       self.table_name = 'operations_user_lists'
 
       belongs_to :project
@@ -18,27 +16,7 @@ module Operations
         presence: true,
         uniqueness: { scope: :project_id },
         length: 1..255
-      validate :user_xids_validation
-
-      private
-
-      def user_xids_validation
-        unless user_xids.is_a?(String) && !user_xids.match(/[\n\r\t]|,,/) && valid_xids?(user_xids.split(","))
-          errors.add(:user_xids,
-                     "user_xids must be a string of unique comma separated values each #{USERXID_MAX_LENGTH} characters or less")
-        end
-      end
-
-      def valid_xids?(user_xids)
-        user_xids.uniq.length == user_xids.length &&
-          user_xids.all? { |xid| valid_xid?(xid) }
-      end
-
-      def valid_xid?(user_xid)
-        user_xid.present? &&
-          user_xid.strip == user_xid &&
-          user_xid.length <= USERXID_MAX_LENGTH
-      end
+      validates :user_xids, feature_flag_user_xids: true
     end
   end
 end

ee/app/validators/feature_flag_user_xids_validator.rb

+# frozen_string_literal: true
+
+class FeatureFlagUserXidsValidator < ActiveModel::EachValidator
+  USERXID_MAX_LENGTH = 256
+
+  def validate_each(record, attribute, value)
+    self.class.validate_user_xids(record, attribute, value, attribute)
+  end
+
+  class << self
+    def validate_user_xids(record, attribute, user_xids, error_message_attribute_name)
+      unless user_xids.is_a?(String) && !user_xids.match(/[\n\r\t]|,,/) && valid_xids?(user_xids.split(","))
+        record.errors.add(attribute,
+                          "#{error_message_attribute_name} must be a string of unique comma separated values each #{USERXID_MAX_LENGTH} characters or less")
+      end
+    end
+
+    private
+
+    def valid_xids?(user_xids)
+      user_xids.uniq.length == user_xids.length &&
+        user_xids.all? { |xid| valid_xid?(xid) }
+    end
+
+    def valid_xid?(user_xid)
+      user_xid.present? &&
+        user_xid.strip == user_xid &&
+        user_xid.length <= USERXID_MAX_LENGTH
+    end
+  end
+end