Date range validation for Cycle Analytics

This change adds date range validation (180 days) to cycle analytics
feature. The frontend validation is already implemented.

ee/changelogs/unreleased/36744-ca-daterange-validation.yml

+---
+title: Add date range validation for Cycle Analytics at the backend side
+merge_request: 24254
+author:
+type: changed

ee/lib/gitlab/analytics/cycle_analytics/request_params.rb

@@ -8,6 +8,8 @@ module Gitlab
         include ActiveModel::Validations
         include ActiveModel::Attributes
 
+        MAX_RANGE_DAYS = 180.days.freeze
+
         attr_writer :project_ids
 
         attribute :created_after, :date
@@ -17,6 +19,7 @@ module Gitlab
         validates :created_before, presence: true
 
         validate :validate_created_before
+        validate :validate_date_range
 
         def project_ids
           Array(@project_ids)
@@ -29,6 +32,14 @@ module Gitlab
 
           errors.add(:created_before, :invalid) if created_after > created_before
         end
+
+        def validate_date_range
+          return if created_after.nil? || created_before.nil?
+
+          if (created_before - created_after).days > MAX_RANGE_DAYS
+            errors.add(:created_after, s_('CycleAnalytics|The given date range is larger than 180 days'))
+          end
+        end
       end
     end
   end

ee/spec/lib/gitlab/analytics/cycle_analytics/request_params_spec.rb

@@ -3,7 +3,7 @@
 require 'spec_helper'
 
 describe Gitlab::Analytics::CycleAnalytics::RequestParams do
-  let(:params) { { created_after: '2018-01-01', created_before: '2019-01-01' } }
+  let(:params) { { created_after: '2019-01-01', created_before: '2019-03-01' } }
 
   subject { described_class.new(params) }
 
@@ -32,6 +32,17 @@ describe Gitlab::Analytics::CycleAnalytics::RequestParams do
         expect(subject.errors.messages[:created_before]).not_to be_empty
       end
     end
+
+    context 'when the date range exceeds 180 days' do
+      before do
+        params[:created_before] = '2019-07-15'
+      end
+
+      it 'is invalid' do
+        expect(subject).not_to be_valid
+        expect(subject.errors.messages[:created_after]).to include(s_('CycleAnalytics|The given date range is larger than 180 days'))
+      end
+    end
   end
 
   it 'casts `created_after` to date' do

ee/spec/support/shared_examples/controllers/analytics/cycle_analytics/shared_stage_shared_examples.rb

@@ -79,7 +79,7 @@ end
 RSpec.shared_examples 'cycle analytics data endpoint examples' do
   before do
     params[:created_after] = '2019-01-01'
-    params[:created_before] = '2020-01-01'
+    params[:created_before] = '2019-04-01'
   end
 
   context 'when valid parameters are given' do
@@ -153,4 +153,13 @@ RSpec.shared_examples 'cycle analytics data endpoint examples' do
 
     include_examples 'example for invalid parameter'
   end
+
+  context 'when the date range exceeds 180 days' do
+    before do
+      params[:created_after] = '2019-01-01'
+      params[:created_before] = '2019-08-01'
+    end
+
+    include_examples 'example for invalid parameter'
+  end
 end

locale/gitlab.pot

@@ -5903,6 +5903,9 @@ msgstr ""
 msgid "CycleAnalytics|Tasks by type"
 msgstr ""
 
+msgid "CycleAnalytics|The given date range is larger than 180 days"
+msgstr ""
+
 msgid "CycleAnalytics|Total days to completion"
 msgstr ""